New Step by Step Roadmap for Social Justice Topics List

<h1> New Step by Step Roadmap for Social Justice Topics List</h1> <h2> Finding the Best Social Justice Topics List</h2> <p>It is the quality of administration gave. Use what you read to help you make some pursuit terms, and to help you pick your own position. Direct access to the property's family room region can't be hindered in any way. Your home must meet prerequisites in all of these 3 zones to have the option to pass the VA examination review. </p> <h2>Why Almost Everything You've Learned About Social Justice Topics List Is Wrong </h2> <p>Your London Solicitor's that have practical experience in retribution pornography cases are associated with bunches of web tidy up and it isn't as troublesome as you may might suspect. At the point when you make a social issue paper, it is pivotal to exhibit your private perspective on the issue. Factory's proposition seem to have some intrigue yet it's difficult to consider them to be a sen sible solution for the issue of social equity. In any case, your exposition should manage a specific social, mental or anthropological issue. </p> <h2> The Meaning of Social Justice Topics List </h2> <p>The focus of this display isn't just to point out these basic difficulties however also to start an exchange. Indeed, even youthful understudies may utilize photography and video for social move. This isn't an example of the work produced by our Essay Writing Service. Educators may take a theme from the present educational program and offer a few options for ventures. </p> <p>When you are given an undertaking to make a paper on a social issue, you're allowed to open an energizing talk. The writing survey is basic as it shows an overall definition and markers or pointers of amazing AP. The inquiry might be a piece of your presentation, or it might make a fantastic title. Endeavoring to do the exploration on what will procure a change there. </p> <p>In case the board Malta industry, you should have great systems administration capacities. You are overseeing particular merchants and you need to see how to speak with them so you locate the most ideal help. At long last, innovation may likewise be utilized by youth that are occupied with prostitution autonomously to have the option to publicize their administrations and discover customers 5. A willful association other than offering types of assistance during crisis tends to the rehabilitative aspects of social work. </p> <h2>Social Justice Topics List Options </h2> <p >Help your child or little girl break down the positive and negative purposes of every chance and select the 1 issue he wishes to deal with most. The absolute initial step is to help your child or little girl pick something he is acceptable at and appreciates doing. Frequently the hardest piece of getting your child to get engaged with a social equity venture is realizing where to begin. Go with your child's lead! </p> <p>Utilize whatever you know to uncover your insight into the planet, and bring out past philosophical hypotheses. Hushing others will be a route for them to settle down their internal world and to be sure they aren't affronted'. The sole thing that somebody must do so as to discuss their perspectives with the world is to make a type of blog. From here, an individual can share the things that they have made on a long range interpersonal communication site, and it may end up being seen by a great many people. </p> <h2>The Ultimate Social Just ice Topics List Trick </h2> <p>This idea that foundations should be openly and similarly promptly accessible to people is called social equity. For example, in the event that one lives in the us or England, for instance, they could talk about how terrible it is, however if they somehow happened to proceed to live elsewhere for a short time, they could have a tremendous stun. Basically, ownership of the 2 ethics which incorporate a sentiment of equity and origination of good, establish opportunity. A noteworthy part social equity training is to believe that understudies are prepared to survey the data we give and use it as it were that is substantial, sensible and applicable to their own one of a kind lives. </p> <p>The thought of equity is generally broke down with respect to reasonableness of conveyance. Social equity issues can occur regarding for all intents and purposes any component of society where disparity can emerge as a result of unreasonable partialities or arrangements. Social equity doesn't imply an individual has rights to something they didn't acquire. Understudies who regarded the social equity strategic substantially more slanted to state they expected to work for social equity later on and felt they had what it takes to impact positive move. </p> <p>If you're expounding on social issues, you will as a rule be expounding on the manner in which the point influences bigger gatherings of individuals, including how neediness influences an entire age. Sexual exploitations are not kidding wrongdoings that hurt a generous level of children and youths. </p> <h2>Getting the Best Social Justice Topics List </h2> <p>With the monetary changes, t he full cause situation has experienced a sensational move. These accounts infer that youngster dealing crooks and individuals encouraging adolescent prostitution are utilizing on the web assets. At the point when individuals can't cover the difficult themselves, at that point crisis help is given once the issue is recognized. For this can bring about a changeless issue for an individual. </p>

Argument Essay Topics For Middle School Students

Argument Essay Topics For Middle School StudentsArgument essay topics for middle school students are plentiful. Most middle school teachers have at least one or two good ideas for how to go about organizing their essays. With so many choices, it can be difficult to select the right one for your subject. Here are some tips to help you decide what to write about.An easy way to begin is to think about how you can illustrate or relate a concept to your topic. Just about every essay topic is about something else. Instead of trying to figure out how to illustrate something with an example, just to make the concept more clear by writing about the subject from another angle. Tell stories, work through math problems, or use metaphor. The point is to establish the topic without giving the reader too much information.If you're stuck on your essay topic, you can try to write about your experiences and beliefs. You may not have a lot of experience in your line of work, but you do have enough that you can relate to other people who are in the same position as you. Rather than giving facts and figures, describe your own life and how it has shaped your belief system. Your essay may come out feeling more personal than your main topic, which is to convince the reader of your point.Some topics for argument essay middle school students should consider include religion, politics, and the environment. Depending on where you live, religion could be a touchy subject. Ask your parents and teachers for advice on this topic. For those who are politically aware, you can write about your opinions or vote based on those opinions. Find an example of an election or a vote, and use this to back up your arguments.How do you think environmental concern affects the world we live in? Consider using local environmental concerns to show how global concerns affect people all over the world. Consider examples of local problems that you feel have affected global issues. Also consider how global issues affect the local environment. To make the global and local issues come across, write about the effect on the environment.Another argument essay topic for middle school students is politics. Create an interesting world where politics work together to benefit the people. Talk about how different countries are governed, and how this affects the people of each country. Define specific elements of political government and use them to create a persuasive essay.Speaking of social issues, consider the controversial issues of the day. Discuss how your religion impacts how people live, work, and express themselves, and how non-religious beliefs will be affected by these societal changes. Even though these topics are not as personal or intimate as the others, they can provide an opportunity to present a viewpoint that doesn't fit into the main topic.Consider all of the topics for argument essay middle school students should write about. Politics is always a good topic, and religion is always a good topic, and even religion and politics can lead to a controversial issue. If you want to include a strong topic, consider these. They are all strong topics that won't take up much time and energy to write about.

Research Paper Topics On Race In Society

Research Paper Topics On Race In SocietyYou may have considered going into a profession as an educator, however you don't know where to begin with regards to looking into your picked topic. It's anything but difficult to get occupied by all the free assets accessible on the web, or you may be uncertain of which bearing to turn. There are numerous valid justifications to think about doing some examination on the web. Here are a couple of the best motivations to look into an article that may intrigue you.First of all, you may discover these articles very educational - there are many research papers on the history and parentage destinations to investigate. Some history and family history destinations give extra data also, for example, chronicles. These are helpful, particularly on the off chance that you need to become familiar with a particular period or individual.Research paper points can frequently end up being the most fitting solution to your inquiries. At the point when you choos e to compose your own paper, it tends to be trying to think of something you can expound on in your branch of knowledge. For instance, you may have been asking why certain numbers or sorts of employments were required, and you might want to comprehend what caused this or why. On the off chance that you were not intrigued by scholarly research from the outset, you may discover this kind of data sufficiently fascinating to do the remainder of the paper without requiring an educator to assist you with any of the research.Many times, notwithstanding, it is significant data that will influence your vocation or way of life that you might need to get some answers concerning. Additionally, this kind of data can be especially valuable to proficient history specialists and analysts. While they may not discover the data you are searching for, they may know about a theme you have not seen, and it could help you.There are many web search tools online that give some examination paper subjects on race in the public eye. This implies you don't have to stress over finding the correct site. The internet searcher will give you a rundown of a few pertinent outcomes that you can utilize. On the off chance that you don't discover what you are searching for, you can generally utilize the manual web index and browse a rundown of subjects that you prefer.In expansion to significant issues influencing our lives, a couple of significant investigations of history and research paper points on race in the public eye offer a brief look into what the world resembled before the present society advanced. These expositions investigate what individuals did and how they lived. There are some fascinating stories included, and this may start an incredible enthusiasm for you.One of the best parts of research paper subjects on race in the public eye is that you can utilize your own thoughts or assessments. This permits you to mesh them into an important and amazing story that would be hard to expound on from a course book. It additionally permits you to remain absolutely mysterious, and nobody will realize you are the writer of the work.So in the event that you are pondering composing an exploration paper on race in the public eye, you can profit by look into paper themes on race in the public arena. They are valuable, and you can get familiar with a great deal about the manner in which various societies and social orders have advanced after some time, and what it intends to us today. In the event that you are keen on composing your own exploration paper, you can learn much by looking into examine papers on race in the public arena.

Edgar Allan Poes Death - Free Essay Example

Sample details Pages: 3 Words: 857 Downloads: 3 Date added: 2019/06/26 Category Literature Essay Level High school Topics: Edgar Allan Poe Essay Did you like this example? No one knows how Edgar Allan Poe Died. People have many theories, such as brain tumors, rabies, suicide etc. Although, there was never any actually proof how he died. Don’t waste time! Our writers will create an original "Edgar Allan Poes Death" essay for you Create order He was given an autopsy, but the documents were never discovered. Cooping was one of the many theories of how he died. Cooping was used in the early 1800s for elections. Multiple men would be beaten, stripped of their clothing and forced to drink until they were drunk out of their minds. Then they were given new clothes and would be sent in to vote for a certain person. It was a way people cheated to get a certain candidate elected. This was very common. This is how Poe is believed by many to have died because of, where and when he was found, what would happen around where he was found and Poes overall health at the time. Edgar Allan Poe was found near a tavern in Baltimore, drunk and in bad condition. He was immediately rushed to a hospital where he soon died mysteriously a few days later. According to many sources he was found, Edgar Allan Poe Found Delirious Outside Baltimore Tavern. On Oct. 3, 1849(findingDulcinea Staff). Edgar was found on election day, the day cooping would have taken place all over Baltimore. When cooping happened the men were dressed in different clothes. Edgar was dressed in clothes he wouldnt normally wear. He was immediately taken to the nearest hospital where he remained in a febrile state, delirious and confused, drifting between vague awareness†babbling incoherently†and complete unconsciousness(Israel Centeno) Variety of sources prove that Ppoe was found in bad shape, like he had been drugged, or not sober. A stage in cooping was, beating the victim and forcing him to intoxicate himself with alcohol or other drugs. All these facts leave a variety of proof po inting his death to cooping. Was the fact he was found outside a poll in cooping condition just a coincidence? According to a source, Edgar was found around Ryans Fourth Ward Polls which was a place where people went to vote. At this time, election ballots were stolen, judges were bribed and voters for the other candidate were intimidated and pressured. So basically, at the voting building where Poe was found near, was where many bad people did bad things. Especially on election day, which was the exact time for cooping to take place. It says, Some gangs were known to kidnap innocent bystanders, holding them in a room, called the coop. (natasha Ggeiling) Then To ensure compliance, their victims were plied with liquor and beaten. Poe could have easily been grabbed, thrown in a room, and beaten for compliance. The odds are just too good for this death to be a coincidence. If Poe actually died from cooping, then he would have either been too injured to live or the liquor would have killed him leaving a small chance for him to survive. No, if you drink liquor once youre not going to die in a matter of a couple days. Although, Poe could have. Poe had an alcohol problem long before he died so he would have eventually ended up dying anyway. This just my have added the cherry on top. At the time he had barely any money, he was just getting by when he had to provide for his family. Now he couldnt even support himself, especially when he lost all hope when his family passed away. According to sources poor nutrition and a weakened condition(The Mysterious Death of Edgar Allan Poe) could have killed him. Think about it, if Poe wasnt eating a lot and was dehydrated then kidnapped and beatin his body would be able to handle it. He was already weak from not getting protein but this would have killed Poe. Besides the rich people in this time period, it was very har d for people to live long. People were not eating enough and the common cold could kill you. Poe wasnt upper class so he had as much of a chance to live as the poor boy that stole bread to survive. Poe was found outside a poll with different clothes and not in his right mind. Was this all just a big Coincidence? Or was Poe a victim of the act Cooping? People at the time were weak and did not live long. Poe may have made beautiful works of literature, but that didnt differ him from anyone else health (body strength) wise. Many facts point to Poe being a victim of cooping, but no one will ever know for sure. Centeno, Israel. The Cooping Theory. Sampsonia Way Magazine, www.sampsoniaway.org/fearless-ink/2013/06/04/the-cooping-theory-israelcenteno/. findingDulcinea. On This Day: Edgar Allan Poe Found Delirious Outside Baltimore Tavern. FindingDulcinea, www.findingdulcinea.com/news/on-this-day/September-October-08/Oct-3On-this-DayEdgar-Allan-Poe-Found-Drunk-and-Delirious-.html. Geiling, Natasha. The (Still) Mysterious Death of Edgar Allan Poe. Smithsonian.com, Smithsonian Institution, 7 Oct. 2014, www.smithsonianmag.com/history/still-mysterious-death-edgar-allan-poe-180952936/. Jaz. The Mysterious Death of Edgar Allan Poe. Edgar Allan Poe Society of Baltimore Articles E. A. P.: A Critical Biography (A. H. Quinn, 1941) (Chapter 01), www.eapoe.org/geninfo/poedeath.htm

Effective Ways to Conclude an Essay Sample

<h1>Effective Ways to Conclude an Essay Sample</h1><p>The approaches to finish up an exposition tests from those utilized by those in advanced education are totally different. They will in general be more in accordance with those utilized by experts in their everyday life and for good reason.</p><p></p><p>The fundamental motivation behind an article or a paper is to catch the understudy's consideration and intrigue so they will proceed with their work and not fall behind in their examinations. There are numerous approaches to move toward this yet understudies need to realize which is best for them.</p><p></p><p>One of the most straightforward approaches to finish up an exposition test is to incorporate your own suppositions or perceptions. Be that as it may, you should possibly do this on the off chance that you feel it is fitting. Understudies can turn out to be baffled when they attempt to enlighten somebody how they feel regarding something, particularly if the individual being referred to can't help contradicting them.</p><p></p><p>Instead, pose inquiries about the assignments you have thought of and request models or different approaches to take care of the issues you have presented. On the off chance that the article is looking truly long, you might need to separate it into sections or even parts with the goal that you can ensure your thoughts don't get lost in the shuffle.</p><p></p><p>Another approach to close a paper test is to utilize visual cues and bolding. These are both successful approaches to close an article tests. A few instructors incline toward the immediate strategy for composing this piece of the exposition so you might need to give this a try.</p><p></p><p>Begin by posting all the themes that you feel are of significance to your understudies. Some may utilize this rundown as a bouncing off point to comp ose the primary passage of the article. Others simply sum up the thoughts they feel essential to them.</p><p></p><p>Many times when understudies end up broadly expounding, they are writing in an unexpected path in comparison to they had foreseen. You need to be certain that you layout your thoughts before starting so it will stream effectively once you get started.</p><p></p><p>The best way to discover what is best for you is to attempt a few strategies and choose which one you feel best meets your requirements. Along these lines you can apply it to a future task with the goal that you won't stall out in the trench of composing articles each day. Simply remember these thoughts and you won't go wrong.</p>

Interesting Topics For a College Business Essay

<h1>Interesting Topics For a College Business Essay</h1><p>In a business paper you can decide to concentrate on intriguing points, on the off chance that you feel that they identify with your vocation. Numerous understudies compose business articles dependent on their own individual lives. Hence you need to discover what intrigues you the most and how that identifies with your career.</p><p></p><p>If you need to compose an expansive scope of subjects and you don't prefer to do your business as a normal everyday employment, this can be an incredible method to do it. On the off chance that you are taking Business subjects in school you need to get familiar with certain themes that will identify with your profession, yet you can likewise utilize the subjects from your typical activities.</p><p></p><p>You might need to discuss the individuals that make up your family, or the things that make your life intriguing. On the of f chance that you are energetic about something, you can make a subject that identifies with it. On the off chance that you like the games that are going on, you can set aside some effort to discuss these and why you like them. The more detail you have when composing a business school exposition, the better.</p><p></p><p>You may jump at the chance to concentrate on a specific expert industry. In the event that you have done anything in this industry, for example, claiming a retail location, you will realize that it is a quickly developing industry. These days we find out about new stores opening each week, so there is space for something in this subject. On the off chance that you are keen on the clinical field, you can discuss the most recent pattern here, regardless of whether it is beginning a little facility or working for a major company.</p><p></p><p>Another famous subject is religion. A large portion of us have discussed this in secondary school and school, however now is the ideal time to discuss it in a paper. On the off chance that you consider what number of individuals you realize who are Christians or have worked in the service. It very well may be a decent subject for you to talk about. Intriguing points for a business school exposition may be the expansion in wrongdoing in our general public. You can take the theme and discussion about how things are deteriorating or the individuals who have encountered these things. You can discuss how we can battle this. Possibly talk about how we can help make the general public more safe.</p><p></p><p>College is an active time and you should be accessible for your classes. Now and again you have to locate the most ideal approaches to fit in the entirety of your exercises and interests. You will see that you can join your own and scholastic life into one, and you won't have the option to do as such on the off chance that you don't locate the most ideal approach to consolidate these two areas.</p>

GED Essay Samples - What Essay GED Samples Is Good For?

<h1>GED Essay Samples - What Essay GED Samples Is Good For?</h1><p>With the immense measure of choices in school confirmation nowadays, it is imperative to pick the correct article and tests that can assist you with your affirmation. These examples can assist you with composing a persuading paper that will make you stand apart among other applicants.</p><p></p><p>The first thing that you have to do before composing an expert exposition is to discover what sorts of article and tests are accessible. A significant number of these expositions were created by proficient scholars and they are intended to dazzle the entrance advisory board. They will have the option to tell from the example on the off chance that you can compose a great exposition dependent regarding your matter. There are paper tests that are generally made via prepared proficient authors, which are not appropriate for school students.</p><p></p><p>You will likewise have a superior possibility of passing the SAT or ACT in the event that you compose an exposition during the test day. So before you plunk down to compose a paper, you should realize which article tests to pick from.</p><p></p><p>The most regular utilization of an exposition in school is to show signs of improvement score on your test. The article gives the last draft a feeling of finish will improve your score.</p><p></p><p>It is significant that you comprehend that the exposition and tests that you use ought to be picked dependent on how well it suits your theme. The more close to home the exposition, the better it will be for your grades. Notwithstanding, it is significant that you pick a subject that you know something about.</p><p></p><p>If you are keen on expounding on your own understanding, this is a decent decision. Recollect that your peruser should feel like you can be straightforward with th em in the event that they are deciding to peruse your paper. Likewise, recollect that your paper ought to be brief and the principles ought to be followed.</p><p></p><p>The tone of your exposition is additionally significant. Your paper must be clear and you should keep the tone of your composition as positive as could be expected under the circumstances. When utilizing harsh speech, you ought to pick the solid words cautiously to ensure that they don't divert the peruser from the message that you are attempting to convey.</p><p></p><p>Finally, pick a subject that you are certain about. On the off chance that you are uncertain of the subject, you ought to pick a theme that is identified with what you know. At that point you should simply get the thoughts out and write.</p>

Fun Research Paper on Art Topics

<h1>Fun Research Paper on Art Topics</h1><p>Why is it so critical to do fun research paper on workmanship subjects? There are two fundamental explanations behind this.</p><p></p><p>First, it tends to be an incredible encounter and you'll have a ton of fun doing it. Second, you can utilize the paper for future reference or just to kill some time while doing other research.</p><p></p><p>When you discover motivation for a bit of workmanship, you may basically simply require some type of study to acknowledge what you've made. A great many people discover their motivation in the craftsman's work or the maker's life. In spite of the fact that these sources can be acceptable at uncovering certainties that might be something else, most occasions they are not so much sufficient enough to totally show the innovativeness and splendor that lie within.</p><p></p><p>When you pick a great research paper on wor kmanship themes, you get the chance to begin seeing what's been covering up on display. You'll figure out how the craftsman's style functions, or how the maker utilizes their life to uncover reality. You'll likewise realize why you ought to never believe yourself with regards to this kind of art.</p><p></p><p>A famous research paper on workmanship subjects that you may end up keen on is the 'Post-existence' inquire about paper. This depends on the life of the craftsman, Nastassja Kinski. She is a figure of the elective exciting music scene and has a site where you can see her fine art and become familiar with her life and career.</p><p></p><p>Nastassja Kinski has been experiencing some genuine dim occasions throughout her life, but on the other hand she's figured out how to make some fabulous workmanship pieces. It's anything but difficult to perceive how this would make her take part in implosion and even be associated with tranquiliz e misuse and prostitution. On the off chance that you can't confide in yourself, you can't be a craftsman and a decent research paper on workmanship subjects is the ideal method to let you know why.</p><p></p><p>Another fascinating examination paper on workmanship points is the 'Beatles Memorabilia' which depends on a portion of the memorabilia identified with the Beatles that are gathered everywhere throughout the world. While there are numerous sorts of memorabilia, it's likely sheltered to state that this paper centers around those that were given to the Beatles by fans.</p><p></p><p>The subjects that can be canvassed in a great research paper on craftsmanship points will be interminable. Simply make sure to investigate you and at your life to perceive what can be utilized as a motivation for your next bit of craftsmanship and see whether that craftsman can truly be trusted!</p>

Essay Writing Guides - How To Structure An Essay Article So That It Fits Your Topic

<h1>Essay Writing Guides - How To Structure An Essay Article So That It Fits Your Topic</h1><p>One of the hardest pieces of composing a paper is finding the correct exposition composing aides and procedures to assist you with composing an amazing exposition. Utilizing a guide will assist you with dodging the most widely recognized entanglements and slip-ups that writers make all through the article composing process. Following a guide will likewise assist you with comprehension and practice what you are perusing so you don't make any syntactic errors.</p><p></p><p>Knowing the principles about sentence structure and accentuation can have a significant effect in your composition. You can commit errors when you are not used to these principles, yet with a guide, you can peruse the article directly from the earliest starting point and become familiar with the standards, and afterward practice what you have realized. On the off chance that you nee d to stay away from disarray, you ought to figure out how to peruse and talk plainly with the goal that you don't commit sentence structure errors. At the point when you are talking, you will feel good on the off chance that you realize how to articulate the words correctly.</p><p></p><p>Most individuals don't care for composing expositions since they don't have the foggiest idea how to structure the paper in the right way. With a guide, you will figure out how to compose your contemplations and gain proficiency with the best possible structure for an article. The principal section of your article ought to be the presentation and the last passage ought to be the end. You can sort out the remainder of the article by isolating it into littler sections.</p><p></p><p>Writing an exposition is a tedious errand. A guide will spare you time since you won't need to accomplish as much work. So as to compose a paper effectively, you ought to do s ome examination about how to do it.</p><p></p><p>Most individuals don't have the foggiest idea how to organize an article well. With a guide, you will realize what sorts of organization work best for you and what configuration doesn't work for you. The guide will likewise mention to you what to place in the body of the article and what not to. In the event that you realize what to remember for the body, you will recognize what to remember for the body.</p><p></p><p>If you need to perceive how to structure an exposition, you should perceive how to make a paper plot. With a blueprint, you will recognize what to place in the body. It will likewise show you how to utilize the central matters of the exposition to fabricate the contention, with the goal that you don't simply sum up the data and try it.</p><p></p><p>You ought to likewise witness what can on the off chance that you have no structure in your paper diagra m. At the point when you have no structure, you may not realize where to begin or how to move alongside the paper. With a blueprint, you will realize where to begin and how to move along. Additionally, you will have the option to structure your paper with the goal that it will stream easily, and in this way bound to be accepted.</p>

How to Write a Sample Essay For Admissions to College

How to Write a Sample Essay For Admissions to CollegeIn my previous article on how to write a sample essay for admittance to college, I talked about the importance of getting ideas down and noting what qualities you like in each. It's been a long time since I've written an essay, but it sure did help.I'm a coach, and I tell my athletes that there is no easy way to become a better athlete. It takes time and hard work. In this case, the student has already spent the money to spend time to study and learn.This student would be smart to submit his or her essay early and ask for help with it. There are professionals out there who can review the essay and give suggestions as to what parts need to be added. The problem is the student has to find these people.Now, since most students don't have this time, they'll need some sort of personal website where they can have this information and create a link that can be included in their essay. Here's what I would suggest. Find a site that features lots of sample essays and get the student to create one.Of course, the best part is the students can include links to any part of the essay they feel is appropriate for inclusion. This is a great way to have the student write the essay from home. There are other tips as well.What I suggested, of course, is to do it for the student but try to make it look like an essay. In this case, the sample essay should have enough common sense to be part of a college curriculum. And, a couple of sentences or ideas about work ethic is always good.Of course, the student should be able to show some academic credentials and/or samples of work ethics. If the student can't do this, they could write an essay called No Sample Essay For Admissions to College. I'd rather see students try their hand at writing an essay for admittance to college than doing nothing and just staying in class.So, take a little time and plan a little. These are the types of articles you will want to submit to colleges when the y're looking for essays to write.

Radio resource management in relay enhanced ofdma based networks - Free Essay Example

Sample details Pages: 29 Words: 8556 Downloads: 6 Date added: 2017/06/26 Category Statistics Essay Did you like this example? 1 Introduction The convenience and popularity of wireless technology has now extended into multimedia communications, where it poses a unique challenge for transmitting high rate voice, image, and data signals simultaneously, synchronously, and virtually error-free . That challenge is currently being met through Orthogonal Frequency Division Multiplexing (OFDM), an interface protocol that divides incoming data streams into sub-streams with overlapping frequencies that can then be transmitted in parallel over orthogonal subcarriers [2,3]. To allow multiple accesses in OFDM , Orthogonal Frequency Division Multiple Access (OFDMA) was introduced. Don’t waste time! Our writers will create an original "Radio resource management in relay enhanced ofdma based networks" essay for you Create order Relaying techniques, along with OFDMA, are used to achieve high data rate and high spectral efficiency. 1.1 Orthogonal Frequency Division Multiple Access OFDMA, an interface protocol combining features of OFDM and frequency division multiple access (FDMA)., was developed to move OFDM technology from a fixed-access wireless system to a true cellular system with mobility with same underlying technology, but more flexibility was defined in the operation of the system [1,8]. In OFDMA, subcarriers are grouped into larger units, referred to as sub-channels, and these sub-channels are further grouped into bursts which can be allocated to wireless users [4]. 1.2 Relay-Enhanced Networks In cellular systems, a way to achieve remarkable increase in data rate, but without claiming for more bandwidth, is to shrink cell sizes, however, with smaller cells more base stations (BSs) are needed to cover a same area due to which deployment and networking of new BSs acquire significant costs [5]. An alternative solution to this problem is to deploy smart relay stations (RSs), which can communication with each other and with BSs through wireless connections reducing systems cost. A relay station (RS), also called repeater or multi-hop station, is a radio system that helps to improve coverage and capacity of a base station (BS) and the resulting networks employing relay stations are sometimes called cooperative networks [6]. 1.3 Technological Requirement The continuously evolving wireless multimedia services push the telecommunication industries to set a very high data rate requirement for next generation mobile communication systems. As spectrum resource becomes very scarce and expensive, how to utilize this resource wisely to fulfil high quality user experiences is a very challenging research topic. Orthogonal frequency-division multiple access (OFDMA)-based RRM schemes together with relaying techniques allocate different portions of radio resources to different users in both the frequency and time domains and offers a promising technology for providing ubiquitous high-data-rate coverage with comparatively low cost than deploying multiple base stations [5]. Although wireless services are the demand of future due to their mobility and low cost infrastructure but along with this they suffer serious channel impairments. In particular, the channel suffers from frequency selective fading and distance dependent fading (i.e., large-scale fading) [1, 8]. While frequency selective fading results in inter-symbol-interference (ISI), large-scale fading attenuates the transmitted signal below a level at which it can be correctly decoded. Orthogonal Frequency-Division Multiple Access (OFDMA) relay-enhanced cellular network, the integration of multi-hop relaying with OFDMA infrastructure, has become one of the most promising solutions for next-generation wireless communications. 1.3.1 Frequency Selective Fading In wireless communications, the transmitted signal is typically reaching the receiver through multiple propagation paths (reflections from buildings, etc.), each having a different relative delay and amplitude. This is called multipath propagation and causes different parts of the transmitted signal spectrum to be attenuated differently, which is known as frequency-selective fading. In addition to this, due to the mobility of transmitter and/or receiver or some other time-varying characteristics of the transmission environment, the principal characteristics of the wireless channel change in time which results in time-varying fading of the received signal [9]. 1.3.2 Large Scale Fading Large scale fading is explained by the gradual loss of received signal power (since it propagates in all directions) with transmitter-receiver (T-R) separation distance. These phenomenonss cause attenuation in the signal and decrease in its power. To overcome this we use diversity and multi-hop relaying. 1.3.3 Diversity Diversity refers to a method for improving the reliability of a message signal by using two or morecommunication channelswith different characteristics. Diversity plays an important role in combatingfadingandco-channel interferenceand avoidingerror bursts. It is based on the fact that individual channels experience different levels of fading and interference. Multiple versions of the same signal may be transmitted and/or received and combined in the receiver [10]. 1.4 Proposed Simulation Model We developed a simulation model in which each user-pair is allocated dynamically a pair of relay and subcarrier in order to maximize its achievable sum-rate while satisfying the minimum rate requirement. The algorithm and the results of the simulation model are given in chapter 4. 1.5 Objectives The objective of our project is to have a detail overview of the literature regarding Orthogonal Frequency Division Multiple Access (OFDMA), Radio Resource Management (RRM) and Relaying techniques. After literature review we developed a simulation framework in which we will try to use minimum resources to get maximum throughput by using dynamic resource allocation. 1.6 Tools For the design and implementation of proposed Algorithm, we have used the following tools MATLAB Smart Draw Corel Draw 1.7 Overview Chapter 2 contains the literature review. It explains the basic principles of OFDMA, Radio Resource Management (RRM) and the relaying techniques. Chapter 3 explains the implementation of OFDM generation and reception that how an OFDM signal is generated and transmitted through the channel and how it is recovered at the receiver. Chapter 4 could be considered as the main part of thesis. It focuses on the simulation framework and the code. We have followed the paper Subcarrier Allocation for multiuser two-way OFDMA Relay networks with Fairness Constraints. In this section we have tried to implement the Dynamic Resource Allocation algorithm in order to achieve the maximum sum rate. Results are also discussed at the end of the end of the chapter. 2 Literature Review Introduction: First section of this Chapter gives a brief overview about OFDMA.OFDMA basically is the combination of Orthogonal Frequency Division Multiplexing (OFDM) and Frequency Division Multiplexing Access (FDMA).OFDMA provides high data rates even through multipath fading channels. In order to understand OFDMA, we must have brief introduction to Modulation, Multiple Access, Propagation mechanisms, its effects and its impairments while using OFDMA. 2.1 Modulation Modulation is the method of mapping data with change in carrier phase, amplitude, frequency or the combination [11]. There are two types of modulation techniques named as Single Carrier Modulation (SCM) Transmission Technique or Multicarrier Modulation (MCM) Transmission Technique. [12] Single Carrier Modulation (SCM) In single carrier transmission modulation (SCM) transmission, information is modulated using adjustment of frequency, phase and amplitude of a single carrier [12]. Multi Carrier Modulation (MCM) In multicarrier modulation transmission, input bit stream is split into several parallel bit streams then each bit stream simultaneously modulates with several sub-carriers (SCs) [12]. 2.2 Multiplexing Multiplexing is the method of sharing bandwidth and resources with other data channels. Multiplexing is sending multiple signals or streams of information on a carrier at the same time in the form of a single, complex signal and then recovering the separate signals at the receiving end [13]. 2.2.1 Analog Transmission In analog transmission, signals are multiplexed using frequency division multiplexing (FDM), in which the carrier bandwidth is divided into sub channels of different frequency widths,and each signal is carried at the same time in parallel. 2.2.2 Digital Transmission In digital transmission, signals are commonly multiplexed using time-division multiplexing (TDM), in which the multiple signals are carried over the same channel in alternating time slots. 2.2.3 Need for OFDMA General wireless cellular systems are multi-users systems. We have limited radio resources as limited bandwidth and limited number of channels. The radio resources must be shared among multiple users. So OFDM is a better choice in this case. OFDM is the combination of modulation and multiplexing. It may be a modulation technique if we analyze the relation between input and output signals. It may be a multiplexing technique if we analyze the output signal which is the linear sum of modulated signal. In OFDM the signal is firstly split into sub channels, modulated and then re-multiplexed to create OFDM carrier. The spacing between carriers is such that they are orthogonal to one another. Therefore there is no need of guard band between carriers. In this way we are saving the bandwidth and utilizing our resources efficiently. 2.3 Radio Propagation Mechanisms There are 3 propagation mechanisms: Reflection, Diffraction and Scattering. These 3 phenomenon cause distortion in radio signal which give rise to propagation losses and fading in signals [14]. 2.3.1 Reflection Reflection occurs when a propagating Electro-Magnetic (EM) wave impinges upon an object which has very large dimensions as compared to the wavelength of the propagating wave. Reflections occur from the surface of the earth and from buildings and walls. 2.3.2 Diffraction When the radio path between the transmitter and receiver is obstructed by a surface that has sharp irregularities (edges), diffraction occurs. The secondary waves resulting from the obstructing surface are present throughout the space and even behind the obstacle, giving rise to a bending of waves around the obstacle, even when a line-of-sight path does not exist between transmitter and receiver. At high frequencies, diffraction, like reflection, depends on the geometry of the object, as well as the amplitude, phase and polarization of the incident wave at the point of diffraction. 2.3.3 Scattering When the medium through which the wave travels consists of objects with dimensions that are small compared to the wavelength, and where the number of obstacles per unit volume is large. Scattered waves are produced by rough surfaces, small objects or by other irregularities in the channel. In practice, foliage, street signs and lamp posts produce scattering in a mobile radio communications system. 2.4 Effects of Radio Propagation Mechanisms The three basic propagation mechanisms namely reflection, diffraction and scattering as we have explained above affect on the signal as it passes through the channel. These three radio propagation phenomena can usually be distinguished as large-scale path loss, shadowing and multipath fading [14][15]. 2.4.1 Path Loss Path Lossis the attenuation occurring by an electromagnetic wave in transit from a transmitter to a receiver in a telecommunication system. In simple words, it governs the deterministic attenuation power depending only upon the distance between two communicating entities. It is considered as large scale fading because it does not change rapidly. 2.4.2 Shadowing Shadowingis the result of movement of transmitter, receiver or any channel component referred to as (obstacles). Shadowing is a statistical parameter. Shadowing follows a log-normal distribution about the values governed by path loss. Although shadowing depends heavily upon the channel conditions and density of obstacles in the channel, it is also normally considered a large scale fading component alongside path loss. 2.4.3 Multipath Fading Multipath Fadingis the result of multiple propagation paths which are created by reflection, diffraction and scattering. When channel has multiple paths. Each of the paths created due to these mechanisms may have its characteristic power, delay and phase. So receiver will be receiving a large number of replicas of initially transmitted signal at each instant of time. The summation of these signals at receiver may cause constructive or destructive interferences depending upon the delays and phases of multiple signals. Due to its fast characteristic nature, multipath fading is called small scale fading. 2.5 Orthogonal Frequency Division Multiplexing (OFDM) Orthogonal Frequency Division Multiplexing (OFDM) is an efficient multicarrier modulation that is robust to multi-path radio channel impairments [15]. Now-a-days it is widely accepted that OFDM is the most promising scheme in future high data-rate broadband wireless communication systems. OFDM is a special case of MCM transmission. In OFDM, high data rate input bit stream or data is first converted into several parallel bit stream, than each low rate bit stream is modulated with subcarrier. The several subcarriers are closely spaced. However being orthogonal they do not interfere with each other. 2.5.1 Orthognality Signals are orthogonal if they are mutually independent of each other. Orthogonality is a property that allows multiple information signals to be transmitted perfectly over a common channel and detected, without interference. Loss of orthogonality results in blurring between these information signals and degradation in communications. Many common multiplexing schemes are inherently orthogonal. The term OFDM has been reserved for a special form of FDM. The subcarriers in an OFDM signal are spaced as close as is theoretically possible while maintain orthogonality between them.In FDM there needs a guard band between channels to avoid interference between channels. The addition of guard band between channels greatly reduces the spectral efficiency. In OFDM, it was required to arrange sub carriers in such a way that the side band of each sub carrier overlap and signal is received without interference. The sub-carriers (SCs) must be orthogonal to each other, which eliminates the guard band and improves the spectral efficiency . 2.5.2 Conditions of orthogonality 2.5.2.1 Orthogonal Vectors Vectors A and B are two different vectors, they are said to be orthogonal if their dot product is zero 2.6 OFDM GENERATION AND RECEPTION OFDM signals are typically generated digitally due to the complexity of implementation in the analog domain. The transmission side is used to transmit digital data by mapping the subcarrier amplitude and phase. It then transforms this spectral representation of the data into the time domain using an Inverse Discrete Fourier Transform (IDFT) but due to much more computational efficiency in Inverse Fast Fourier Transform (IFFT), IFFT is used in all practical systems. The receiver side performs the reverse operations of the transmission side, mixing the RF signal to base band for processing, and then a Fast Fourier Transform (FFT) is employed to analyze the signal in the frequency domain. The demodulation of the frequency domain signal is then performed in order to obtain the transmitted digital data. The IFFT and the FFT are complementary function and the most suitable term depends on whether the signal is being recovered or transmitted but the cases where the signal is independent of this distinction then these terms can be used interchangeably [15]. 2.6.1 OFDM Block Diagram 2.6.2 Implementation of OFDM Block Diagram 2.6.2.1 Serial to Parallel Conversion: In an OFDM system, each channel can be broken down into number of sub-carriers. The use of sub-carriers can help to increase the spectral efficiency but requires additional processing by the transmitter and receiver which is necessary to convert a serial bit stream into several parallel bit streams to be divided among the individual carriers. This makes the processing faster as well as is used for mapping symbols on sub-carriers. 2.6.2.2 Modulation of Data: Once the bit stream has been divided among the individual sub-carriers by the use of serial to parallel converter, each sub-carrier is modulated using 16 QAM scheme as if it was an individual channel before all channels are combined back together and transmitted as a whole. 2.6.2.3 Inverse Fourier Transform: The role of the IFFT is to modulate each sub-channel onto the appropriate carrier thus after the required spectrum is worked out, an inverse Fourier transform is used to find the corresponding time domain waveform. 2.6.2.4 Parallel to Serial Conversion: Once the inverse Fourier transform has been done each symbol must be combined together and then transmitted as one signal. Thus, the parallel to serial conversion stage is the process of summing all sub-carriers and combining them into one signal 2.6.2.5 Channel: The OFDM signal is then transmitted over a channel with AWGN having SNR of 10 dB. 2.6.2.6 Receiver: The receiver basically does the reverse operations to the transmitter. The FFT of each symbol is taken to find the original transmitted spectrum. The phase angle of each transmission carrier is then evaluated and converted back to the data word by demodulating the received phase. The data words are then combined back to the same word size as the original data. 2.7 OFDMA in a broader perspective OFDM is a modulation scheme that allows digital data to be efficiently and reliably transmitted over a radio channel, even in multipath environments [17]. OFDM transmits data by using a large number of narrow bandwidth carriers. These carriers are regularly spaced in frequency, forming a block of spectrum. The frequency spacing and time synchronization of the carriers is chosen in such a way that the carriers are orthogonal, meaning that they do not interfere with each other. This is despite the carriers overlapping each other in the frequency domain [18]. The name OFDM is derived from the fact that the digital data is sent using many carriers, each of a different frequency (Frequency Division Multiplexing) and these carriers are orthogonal to each other [19]. 2.7.1 History of OFDMA The origins of OFDM development started in the late 1950s with the introduction of Frequency Division Multiplexing (FDM) for data communications. In 1966 Chang patented the structure of OFDM and published the concept of using orthogonal overlapping multi-tone signals for data communications. In 1971 Weinstein introduced the idea of using a Discrete Fourier Transform (DFT) for Implementation of the generation and reception of OFDM signals, eliminating the requirement for banks of analog subcarrier oscillators. This presented an opportunity for an easy implementation of OFDM, especially with the use of Fast Fourier Transforms (FFT), which are an efficient implementation of the DFT. This suggested that the easiest implementation of OFDM is with the use of Digital Signal Processing (DSP), which can implement FFT algorithms. It is only recently that the advances in integrated circuit technology have made the implementation of OFDM cost effective. The reliance on DSP prevented the wide spread use of OFDM during the early development of OFDM. It wasnt until the late 1980s that work began on the development of OFDM for commercial use, with the introduction of the Digital Audio Broadcasting (DAB) system . 2.7.2 Advantages using OFDMA There are some advantages using OFDMA. OFDM is a highly bandwidth efficient scheme because different sub-carriers are orthogonal but they are overlapping. Flexible and can be made adaptive; different modulation schemes for subcarriers, bit loading, adaptable bandwidth/data rates possible. Has excellent ICI performance because of addition of cyclic prefix. In OFDM equalization is performed in frequency domain which becomes very easy as compared to the time domain equalization. Very good at mitigating the effects of delay spread. Due to the use of many sub-carriers, the symbol duration on the sub-carriers is increased, relative to delay spread. ISI is avoided through the use of guard interval. Resistant to frequency selective fading as compared to single carrier system. Used for high data rate transmission. OFDMA provides flexibility of deployment across a variety of frequency bands with little need for modification is of paramount importance. A single frequency network can be used to provide excellent coverage and good frequency re-use. OFDMA offers frequency diversity by spreading the carriers all over the used spectrum. 2.7.3 Challenges using OFDMA These are the difficulties we have to face while using OFDMA [20][21][22], The OFDM signal suffers from a very high peak to average power ratio (PAPR) therefore it requires transmitter RF power amplifiers to be sufficiently linear in the range of high input power. Sensitive to carrier frequency offset, needs frequency offset correction in the receiver. Sensitive to oscillator phase noise, clean and stable oscillator required. The use of guard interval to mitigate ISI affects the bandwidth efficiency. OFDM is sensitive to Doppler shift frequency errors offset the receiver and if not corrected the orthogonality between the carriers is degraded. If only a few carriers are assigned to each user the resistance to selective fading will be degraded or lost. It has a relatively high sensitivity to frequency offsets as this degrades the orthogonality between the carriers. It is sensitive to phase noise on the oscillators as this degrades the orthogonaility between the carriers. 2.7.4 Comparison with CDMA in terms of benefits 2.7.4.2 CDMA Advantages: CDMA has some advantages over OFDMA [22], Not as complicated to implement as OFDM based systems. As CDMA has a wide bandwidth, it is difficult to equalise the overall spectrum significant levels of processing would be needed for this as it consists of a continuous signal and not discrete carriers. Not as easy to aggregate spectrum as for OFDM. 2.7.5 OFDMA in the Real World: UMTS, the European standard for the 3G cellular mobile communications, and IEEE 802.16, a broadband wireless access standard for metropolitan area networks (MAN), are two live examples for industrial support of OFDMA. Table 1 shows the basic parameters of these two systems. UMTS(Cellular ) IEEE IEEE 802.16 ( Wireless I IEEE 802.16 ( Wireless MAN ) System bandwidth 100kHz-1.6MHz (Flexible) 6Mhz Number of subcarriers 240 / 100kHz 2048 Subcarrier spacing 4.16kHz 3.35kHz n Subcarriers / Band-unit 24 Subcarrier/Bandslot 53 Subcarrier/Subchannel Modulation time 240 s 298 s Guard time 38 s (pre-) and 8 s (post-guard) 38 s Symbol time 288 s 340 s Resource allocation unit 1 bandslot, 1 timeslot (1 symbol) 1 Subchannel, 1 timeslot Modulation QPSK , 8-PSK QPSK, 16-QAM, 64-QAM (differential and coherent) Channel coding Convolutional (1/3, 2/3) Turbo (1/2) Opt. Outer Reed-Solomon (4/5) Frequency hopping 1 hop/burst, 876 hop/sec, 1.6MHz NA (Flexible) Max. Data throughput 11 Table 1. OFDMA system parameters in the UMTS and IEEE 802.16 standards 2.8 Radio Resource Management In second section of this chapter we will discuss radio resource management schemes, why we need them and how they improve the efficiency of the network. Radio resource management is the system level control of co-channel interference and other radio transmission characteristics in wireless communication systems. Radio resource management involves algorithms and strategies for controlling parameters such as Transmit power Sub carrier allocation Data rates Handover criteria Modulation scheme Error coding scheme, etc 2.8.1 Study of Radio Resource Management End-to-end reconfigurability has a strong impact on all aspects of the system, ranging from the terminal, to the air interface, up to the network side. Future network architectures must be flexible enough to support scalability as well as reconfigurable network elements, in order to provide the best possible resource management solutions in hand with cost effective network deployment. The ultimate aim is to increase spectrum efficiency through the use of more flexible spectrum allocation and radio resource management schemes, although suitable load balancing mechanisms are also desirable to maximize system capacity, to optimize QoS provision, and to increase spectrum efficiency. Once in place, mobile users will benefit from this by being able to access required services when and where needed, at an affordable cost. From an engineering point of view, the best possible solution can only be achieved when elements of the radio network are properly configured and suitable radio resource m anagement approaches/algorithms are applied. In other words, the efficient management of the whole reconfiguration decision process is necessary, in order to exploit the advantages provided by reconfigurability. For this purpose, future mobile radio networks must meet the challenge of providing higher quality of service through supporting increased mobility and throughput of multimedia services, even considering scarcity of spectrum resources. Although the size of frequency spectrum physically limits the capacity of radio networks, effective solutions to increase spectrum efficiency can optimize usage of available capacity. Through inspecting the needs of relevant participants in a mobile communication system, i.e., the Terminal, User, Service and Network, effective solutions can be used to define the communication configuration between the Terminal and Network, dependent on the requirements of Services demanded by Users. In other words, it is necessary to identify proper communications mechanisms between communications apparatus, based on the characteristics of users and their services. This raises further questions about how to manage traffic in heterogeneous networks in an efficient way. 2.8.2 Methods of RRM 2.8.2.1 Network based functions Admission control (AC) Load control (LC) Packet scheduler (PS) Resource Manager (RM) Admission control In the decision procedure AC will use threshold form network planning and from Interference measurements. The new connection should not impact the planned coverage and quality of existing Connections. (During the whole connection time.) AC estimates the UL and DL load increase which new connection would produce. AC uses load information from LC and PC. Load change depends on attributes of RAB: traffic and quality parameters. If UL or DL limit threshold is exceeded the RAB is not admitted. AC derives the transmitted bit rate, processing gain, Radio link initial quality parameters, target BER, BLER, Eb/No, SIR target. AC manages the bearer mapping The L1 parameters to be used during the call. AC initiates the forced call release, forced inter-frequency or intersystem handover. Load control Reason of load control Optimize the capacity of a cell and prevent overload The interference main resource criteria. LC measures continuously UL and DL interference. RRM acts based on the measurements and parameters from planning Preventive load control In normal conditions LC takes care that the network is not overloaded and remains Stable. Overload condition . LC is responsible for reducing the load and bringing the network back into operating area. Fast LC actions in BTS Lower SIR target for the uplink inner-loop PC. LC actions located in the RNC. Interact with PS and throttle back packet data traffic. Lower bit rates of RT users.(speech service or CS data). WCDMA interfrequency or GSM intersystem handover. Drop single calls in a controlled manner. 2.8.2.3 Connection based functions Handover Control (HC) Power Control (PC) Power control Uplink open loop power control. Downlink open loop power control. Power in downlink common channels. Uplink inner (closed) loop power control. Downlink inner (closed) loop power control. Outer loop power control. Power control in compressed mode. Handover Intersystem handover. Intrafrequency handover. Interfrequency handover. Intersystem handover. Hard handover (HHO). All the old radio links of an MS are released before the new radio links are established. Soft handover (SHO) SMS is simultaneously controlled by two or more cells belonging to different BTS of the same RNC or to different RNC. MS is controlled by at least two cells under one BTS. Mobile evaluated handover (MEHO) The UE mainly prepares the handover decision. The final decision is made by SRNC. Network evaluated handover (NEHO) The SRNC makes the handover decision. 2.8.3 Why we need RRM or Purpose of RRM? The rapid increase in the size of the wireless mobile community and its demands for high-speed multimedia communications stands in clear contrast to the rather limited spectrum resources that have been allocated in international agreements. Efficient spectrum or radio resource management (RRM) is of paramount importance due to these increasing demands. Purposes of RRM are as: Ensure planned coverage for each service. Ensure required connection quality. Ensure planned (low) blocking. Optimise the system usage in run time. 2.8.4 Joint Radio Resource Management (JRRM) In designing wireless systems, typical problems are encountered, such as the signal attenuation, terminal noise, fast fading due to the multipath phenomenon, shadowing, Multiple Access Interference (MAI) and other typical system related features, e.g. the mutual relation between interference strength and duration period given by link adaptation. These typical problems challenge the communication systems from using radio resources efficiently. The radio resources not only, by definition, the radio spectrum, but also realized in the real radio networks, access rights for individual mobile users, time period a mobile user being active, channelization codes, transmission power, connection mode, etc., that require the management functions being designed in different time scales. Furthermore, radio resources from different radio networks can be managed jointly in order to solve the encountered problems more effectively. The term Joint Resource Management (JRRM) is therefore generalized as: JRRM are the controlling mechanisms that support intelligent admission of calls and sessions for a set of networks or cell layers. They control the distribution of traffic, power and the variances of them, thereby aiming at an optimized usage of radio resources and maximized system capacity. JRRM mechanisms work over multiple radio networks or cell layers with the necessary support of reconfigurable/multi-mode terminals. JRRM is operated in a network which consists of several subnetworks or cell layers of a single radio network. The term subnetwork is defined in Definition I-2. The High Performance Radio Local Area Network Type 2 (H/2) as a typical WLAN RAT specified by ETSI (European Telecommunications Standards Institute) BRAN (Broadband Radio Access Networks) and UMTS/FDD specified by the 3rd Generation Partnership Project (3GPP) are two subnetworks studied in this thesis. 2.8.5 Sub-Carrier Allocation We have analyzed the Dynamic sub-carrier allocation algorithm the main of which is to allocate dynamically a pair of relay and subcarrier to each user-pair in order to minimize the achievable sum rate of each user-pair while satisfying the minimum rate requirement for every user-pair. 2.9 Relay Station and Relay Enhanced Systems A relay basically is a transceiver which creates a communication link between the source and destination [23]. It virtually can be considered as another transmitter. In third section of this chapter we will be discussing basic idea about Relay, Relay stations, Relaying and its strategies, Co-operative and non-cooperative relaying. But in order to understand these terms one must have idea about Cellular networks, their demand for coverage and capacity and the benefit of using relay station in order to increase the capacity [24]. 2.9.1 Cellular Networks Cellular networks are radio networks made up of a number of non-overlapping cells, each served by at least one base station, that cover a wide geographic area. Several frequencies are assigned to each cell, which can be reused in other cells. Cellular networks mainly consist of two parts: the radio access network or base station subsystem (BSS) and the core network, which are connected through a backhaul connection [24]. 2.9.1.1 Analog Transmission to Digital Transmission Cellular networks appeared in the 1960s and used analog communications. Second generation systems moved from analog to digital due to its many advantages. The components are cheaper, faster, smaller, and require less power. Voice quality is improved due to error correction coding. Digital systems also have higher capacity than analog systems since they can use more spectrally-efficient digital modulation and more efficient techniques to share the cellular spectrum. They can also take advantage of advanced compression techniques and voice activity factors. In addition, encryption techniques can be used to secure digital signals against eavesdropping. Digital systems can also offer data services in addition to voice, including short messaging, e-mail, Internet access, multimedia capabilities, etc [24]. 2.9.1.2 Base Station Subsystem The base station subsystem is responsible for handling traffic and signaling between the core network and the user. It consists of a network of base station transceivers (called nodes) grouped under several base station controllers (BSC or Radio Network Controllers (RNC)) which are connected to the core network. A single BSC can have tens or even hundreds of BTSs under its control. The BSC handles allocation of radio channels, is in charge of admission control, receives measurements from the mobile phones, controls handovers from BTS to BTS, etc. The BSC can route voice calls through the public switched telephone network (PSTN) or provide Internet access. It also acts as a concentrator of low capacity connections to and from the BTS into a high capacity connection to and from the core network. The Base Station is in charge of the radio interface: scrambling, modulation, scheduling, adaptative coding, link quality measurements, soft handovers, etc[24]. 2.9.2 Core Network The core network is in charge of routing and forwarding the user data, handovers between different technologies, it manages the databases with the user and terminals information, security issues, etc. The core network in cellular networks has suffered several changes over the last decade. For example, in the GSM second generation networks a new packet commuting network was added later to give support to GPRS technology which included gateways to external IP networks. Later on, with third generation networks like UMTS and its several releases, the core network was expanded to support soft switching (release 4) or multimedia transmissions (release 5 with the multimedia subsystem). Presently, the core network is evolving to an all-IP network in future generation networks [24]. 2.9.4 Coverage Area The coverage area of a cell is the expected percentage of the cells area where the received power is greater than a certain minimum, given that the user terminals require a minimum received SNR for acceptable performance. 2.9.5 Capacity Capacity refers to the theoretical maximum transmission rate that can be achieved over a wireless channel. 2.9.6 Need of using Relay Technology Presently, the amount of free spectrum is decreasing, and future networks will have to use the available bands at higher frequencies, meaning a decrease in coverage and an increase in base station density. Moreover, next generation cellular networks are expected to support different types of services including web browsing, FTP, video streaming, VoIP, online gaming, real time video, etc., therefore require even higher transmission rates. Physical layer technologies such as OFDM, smart antennas and Multiple Input Multiple Output (MIMO) systems are being designed to achieve this goal. Relay technology can be used both to increase capacity and coverage, as many papers have proved thus far [24]. 2.10 Relay A relay is a node that receives information from the source and forwards it to the destination, so it can assist in a transmission to improve performance. Relays can have many applications, like capacity enhancement, load balancing or coverage extension of cells, which is what we are interested in. SOURCE RELAY DESTINATION 2.10.1 Why to use Relay Some reasons which become the reason of deploying relays [25], Mobile stations can transmit at lower power. Transmission at higher frequencies is more vulnerable to non LOS conditions. The transmission power required for high data rates at large distances is very high Increasing the base station density is one option A relay acts as a helper node to increase coverage and throughput. Relay is connected to the base station through wireless channel. Relays are much closer to the mobile stations than the base station; hence high data rates are possible. 2.10.2 Cooperative relaying In general, every communicating system has a source node that broadcast the signal towards the multiple/helping relays in the network, which in turn re transmits the processed version towards the destination [26]. 2.10.2.1 Benefits of using Cooperative Relaying Cooperative relaying provides [27], Better BER performance due to spatial diversity Higher efficiency due to spatial multiplexing 2.10.2.2 Two methods of Cooperative Relaying There are two phases through which a signal have to move in order to reach the destination utilizing cooperative environment, Broadcasting Mode (BA) When the source broadcasts the signal towards multiple relays present in between destination and source. Multiple Access Mode (MA) When different relays transmits their data towards a single destination. This mode of transferring info from multiple relays to single destination is multiple access mode. 2.10.3 Multihop Communication Multi-hop communication occurs when data travel from the source to the destination node via more than two hops. This could be achieved without need of other costly BSs. The maximum allowed number of hops must be carefully considered (higher number of hops increases a transmission time). Multi-hop based network may also improve system performance thanks to cooperative relay technique. This is accomplished by sending information simultaneously via multiple different paths and combining the received information at the side of receiver [28]. 2.10.4 Relay Station A relay station is an intermediate station/node that passes information between terminals or other relay stations and is used to help a base station to improve its coverage and capacity. Relay station has other names such as repeater, or multi-hop station and the networks that use relay stations are sometimes called cooperative networks [29]. The notion of relay channel appeared in the late 60s. E. C. van der Meulen introduced the idea of a three-terminal communication channel consisting of a source, a destination and a relay. T. M. Cover and A. El Gamal later published a paper where they computed upper and lower bounds for the capacity of the single relay channel and give an exact expression for the Gaussian degraded case. Given the complexity of the relay channel, it hasnt been until the exhaustive research on MIMO channels over the last decade that relay networks have been on the spot again, and recently there have been many publications on the topic [24]. 2.10.4.1 Concept of Relay Figure 2.3 Relaying System RS will typically cover a region up to 300 miles in diameter and transmit at lower power level than BS. Relays do not have wired connection to backhaul. Cooperative diversity is additional advantage of relaying [25]. 2.10.4.2 Relay station vs. Base Station The primary advantage of deploying relay stations in terms of the cost is expected to come from the differences in the cost of the backhaul. When a relay station is deployed, instead of a Base Station with a wired backhaul connection, there are no direct backhaul costs. There is no cost for provisioning the wired connection, and there are no monthly charges for the backhaul. Similarly, when a relay station is deployed, instead of a Base Station with wireless backhaul, the use of a relay station eliminates the need to purchase, set up, and maintain microwave link equipment, and to purchase the rights to additional spectrum in which this equipment operates. Relay Stations are also expected to be less costly to deploy because they do not require line of sight channel conditions on the relay link, allowing greater flexibility in site selection than for a Base Stations with wireless backhaul. The idea behind a relay channel is to use the relay to create spatial diversity sending the same signal through independent fading paths. This can be done in two steps. Firstly, the source broadcasts the signal both to the relay and the destination. In the second step, the relay transmits the received signal to the destination, so the destination ends up with two different independent versions of the same signal. The way in which the relay processes and retransmits the received signal to the destination has given rise to several strategies which have been deeply analyzed in the literature [24]. 2.10.5 Relaying Strategies There are many relaying strategies; three of them are discussed below 2.10.5.1 Amplify-and-Forward (AF) This is the simplest strategy that can be used at the relay because it acts as a dummy with a constraint on the maximum power. The relay amplifies the received signal from the source and transmits it to the destination without doing any decision. The main drawback of this strategy is that the relay terminal is also amplifying the received noise to the destination. When this strategy is applied to the cooperative communication, it is able to obtain a better uncoded bit error rate (BER) than direct transmission [5]. Additionally, the outage probability of the cooperative communication is also derived, demonstrating that a diversity order of two is obtained for two cooperative users. When the relay is equipped with multiple antennas and there is channel state information (CSI) of the source-relay and relay destination links, the AF strategy can attain significant gains over the direct transmission by means of optimum linear filtering the data to be forwarded by the relay [30]. In AF strategy, the relay simply amplifies the noisy version of the signal it has received in the first step and retransmits this noisy version. The destination then combines both signals to decide the transmitted bit. More generally, AF refers to any strategy where the relay linearly transforms the received signal. Although noise is also amplified in the relay, this strategy produces two independent versions of the same signal at the destination which allow for a better detection of the information sent. It has been proved that this strategy is optimal at high SNR, achieving diversity of order two [24]. 2.10.5.2 Decode-and-Forward (DF) In DF strategies, the relay tries to detect the received information, re-encodes and retransmits the signal after detection. If detection is unsuccessful the relaying can be harmful when detecting at the destination, therefore the strategy should be implemented such that the relay only retransmits the information when detection is successful. DF requires more complex devices than AF methods, but the noise at the receiver is much lower [24]. The RS decodes the signal and performs error correction. The decoded data is encoded using the same or different codebook before transmitting to the destination. The two phases need not be of same duration [25]. 2.10.5.3 Compress-and-Forward (CF) In this case, the relay performs a non-linear transformation on the received signal and then retransmits to destination. In this way, the relay station can compress the received signal and forward it to destination without the need to decode it. Some typical examples of CF strategies are Estimate and Forward or Quantize and Forward [24]. The relay compresses the received signal by using Wyner-Ziv lossy source coding and forwards it to the destination [25]. 2.10.5.4 Relaying Techniques (Some Facts) DF performs well only when the channel quality between BS and the RS is good. Only advantage of AF is that it is computationally less intensive at the relay. CF technique performs better than direct transmission in all channel conditions even if channel between BS and RS is degraded. CF is computationally intensive. CF is not considered for Wimax relaying [31]. 2.10.6 Relay usage Scenarios These are the Relay usage scenarios created for IEEE 802.16j. 2.10.6.1 Fixed Infrastructure Fixed-infrastructure relays, like BSs, are to be deployed by the service provider in stationary areas to serve general traffic. They are intended to increase both throughput and coverage because they are likely to be placed above roof tops to allow an LOS with the BS, but this may not always be the case. This category also may include commercial relays purchased by a subscriber, which may leave and enter the network at any time [31]. Fixed Infrastructure is to improve coverage in shadow areas and increase throughput due to LOS communication [25]. 2.10.6.2 In-Building Coverage Even with the relatively small demands of voice service, current mobile phones often perform poorly inside buildings. Relays are expected to be placed both by the service provider and by the end user near the shell, or just inside, of the building to fill the coverage hole inside. This type of relay also can be deployed near tunnels or subways to provide coverage where there is otherwise none. These relays can be nomadic and likely will operate with NLOS channels. Intriguingly, they may operate on battery power and probably will have low complexity [31]. In-Building coverage scenario is to fill the coverage hole inside the building [25]. 2.10.6.3 Temporary Coverage Events where a large group of people are densely packed into a small area form a unique opportunity for relays. The multihop capability of 802.16j will enable some of the traffic generated by this dense population to be routed to BSs in adjacent cells. Near stadiums, this infrastructure can be placed by the service provider as a permanent solution. Temporary relays also can be deployed in emergencies where some BSs may have been damaged. For this reason, temporary coverage relays may be required to run on batteries and will range from small and simple to large and complex [31]. Temporary coverage is for the stadiums or gatherings of people during an event. It is also temporary replacement to a damaged relay [25]. 2.10.6.4 Coverage on Mobile Vehicle A mobile vehicle, such as a train or bus, presents unique challenges to communications engineers. Usually, there are several people located very closely together, and the vehicle is moving, sometimes very quickly, through cells. To provide reliable coverage to such users, a complex relay may be deployed on the vehicle and obviously, will be highly mobile [31]. A complex relay is required that can handle quick handoffs while providing coverage in train or bus [25]. 2.10.7 Diversity Multipaths in certain scenarios create fading in the received signal. Due to the high possibility of the multipaths and fading nature of the channel, Diversity technique is being organized which can effectively reduce that fading effects and provides much better reception at the receiver side by achieving same signal trough different channels which in turn with some appropriate combining scheme decreasing probability of BER of the signal and provides better communication result [32]. There are three ways of achieving diversity. Transmit Diversity Receive Diversity MIMO Diversity 2.10.7.1 Cooperative Diversity Cooperative diversityis a cooperative multiple antenna technique for improving or maximising total networkchannel capacitiesfor any given set of bandwidths which exploits userdiversityby decoding the combined signal of the relayed signal and the direct signal in wireless multihop networks. 2.10.7.2 Spatial Diversity Spatial diversityis one of several wirelessdiversity schemesthat use two or more antennas to improve the quality and reliability of a wireless link. Often, especially in urban and indoor environments, there is no clearline-of-sight(LOS) between transmitter and receiver. Instead the signal is reflected along multiple paths before finally being received. Multiple paths created by use of relay can be used to exploit spatial diversity. 3 OFDM Simulation and Results In this chapter, we will discuss about simulation model of OFDM transceiver developed in MATLAB and will be discussing the simulation results. 3.1 OFDM Transceiver implementation Simulation for implementation of basic OFDM transceiver is divided into three portions: OFDM Transmitter Channel OFDM Receiver 3.2 OFDM Transmitter OFDM Transmitter simulation consists of the following steps as shown is Figure 5.1. Binary Data Generation Conversion of Serial input data into Parallel format Modulation of each symbol using 16 QAM IFFT block of each modulated symbol Generation of OFDM signal by combining symbols in serial fashion 3.3 Channel Channel that we implement in simulation is AWGN with 10 dB SNR 3.4 OFDM Receiver OFDM Receiver simulation consists of the following steps as shown in Figure 5.2. Reception of Signal through channel and converting into parallel fashion FFT of each symbol QAM demodulation Parallel to Serial Conversion to recover the transmitted data 3.5 Results of Simulation Model 3.5.1 Message Signal A random Signal is generated using MATLAB built-in function binornd and is plotted as shown in Figure 5.3 Modulated Signal Each symbol is passed through the QAM modulator using qammod built-in function in MATLAB and the scatter plot is obtained as shown in figure 5.4 Signal through Channel The signal is passed through the channel which is considered as Additive White Gaussian Noise and its scatter plot is given in the Figure 5.5. Demodulation The received signal is converted into parallel format and then each symbol is demodulated using MATLAB built-in function qamdemod. The scatter plot obtained is shown in the Figure 5.6 Recovered Signal The demodulated symbols are then combined together in order to have the data transmitted data as shown in Figure 5.7 3.6 Conclusion We have analyzed that how an OFDM signal is generated typically digitally and found that with 10dB SNR signal can be recovered easily but below that SNR there are chances of error in the recovered signal 4 Implementation of Dynamic Subcarrier Allocation ( DSA) Algorithm In this chapter, we will discuss about the research paper we followed during our final year project and the implementation of the algorithm Dynamic Subcarrier Allocation (DSA) proposed in the research paper followed. 4.1 Introduction to Research Paper During our final year project we have studied many research papers and selected Subcarrier Allocation for Multiuser Two-Way OFDMA Relay Networks with Fairness Constraints by Hanmok Shin and Jae Hong Lee, Seoul National University, Korea, published at VTC. In this paper we analyzed an adaptive subcarrier allocation scheme for a multiuser two-way OFMDA relay network having multiple user-pairs and multiple relays. 4.1.1 One-way versus Two-way Half duplex relaying systems 4.1.1.1 One-way Half duplex relaying Systems In one-way half-duplex mode relays dont transmit and receive simultaneously at same time and frequency as shown in Figure 6.1. The main disadvantage of these relaying systems is a loss in throughput compared with full-duplex relaying. 4.1.1.2 Two-way Half duplex relaying Systems In two-way half-duplex relaying systems two users communicate with each other in two phases: Phase 1 Phase 1 is the Multiple Access (MA) phase in which all users transmit their information simultaneously to relays. Phase 2 Phase 2 is the Broadcast (BC) phase in which the relay amplifies the received signal and then broadcast it to all the users using same sub-carrier. Both these phases are shown in Figure 6.2. Compared with traditional one-way half-duplex relaying systems, these systems achieve higher power and spectral efficiencies by allowing simultaneous message exchange between a BS and the users [1]. In two-way half-duplex relaying both Amplify and Forward (AF) and Decode and Forward (DF) protocols can be used but AF protocol due to its simple transceiver design is more appealing in practice and is also considered in the paper followed. 4.2 Dynamic Sub-carrier Allocation (DSA ) Algorithm We have analyzed the Dynamic sub-carrier allocation algorithm the main aim of which is to allocate dynamically a pair of relay and subcarrier to each user-pair in order to maximize the achievable sum-rate of each user-pair while satisfying the minimum rate requirement for every user-pair. The algorithm is divided into three main steps given below: Step 1 In the first step, all sets and subcarrier assignment indicator variables are initialized, where the set of user-pairs, relays, and subcarriers are denoted by K , M , and N , respectively. Set: K={1,2,.,K} M = {1, 2, . . .,M} N={1,2,,N} k,m(n)= 0 Step 2 In the second step, one relay-subcarrier pair (m*,n*) which maximizes the instantaneous rate (rk,m(n)) is allocated to one user-pair for all user-pairs. for k = 1 : K do (m*,n*) = arg max rk,m(n) , m M, n N k,m*(n*) = 1 , N = N {n*}; Update rk end where rk is achievable rate of the kth user-pair. Step 3 In the third step, remaining subcarriers are allocated to the user-pairs and relays under the maximum transmit power constraints of the users and relays. while N do k*=arg min rk , k K if rk* rmin then (m*,n*) = arg max rk*,m(n) , m M, n N k*,m*(n*) = 1 , N = N {n*}; If n=1NpAk*(n)=n=1NpBk*(n)PU then K = K {k*} ; end If n=1NpRm*(n)PR then M = M {m*}; end else n* = rand (N); (k*,m*) = arg max rk,m n* , m M, k K k,m*(n*)=1, N = N { n* }; If n=1NpAk*(n)=n=1NpBk*(n)PU then K = K {k*} ; end If n=1NpRm*(n)PR then M = M {m*}; end end Update rk end Where PU and PR denote the maximum transmit power of each of users and relays, respectively. pAk(n) and pBk(n) denote the transmit power of the user Ak and Bk on the subcarrier n, respectively. 4.3 Simulation Framework and Results 4.3.1 Simulation Parameters We considered the values of parameter in our simulation framework as shown in Table 6.1 Parameter Value No. of User-pairs 8 No. of Relays 3 No. of Sub-carriers 128 Minimum rate requirement 2.5 Mbps Maximum Transmitting power of each user 100 mWatts Maximum Transmitting power of relay 3000 mWatts Table 4.1 4.3.2 Simulation Results We developed the simulation framework to implement the DSA algorithm in MATLAB by employing the above parameters and found the results as shown in Figure 6.3. Results shows that subcarriers are allocated to each user-pair unless each user-pair or each relay meets its maximum power constraint else all the subcarriers will be allocated to all the user-pairs while satisfying the minimum rate requirement for every user-pair. 5 Conclusions Future Work 5.1 Conclusion: Our work basically involved study of relaying and OFDMA technologies. We analyzed adaptive subcarrier allocation algorithm for a multiuser two-way OFDMA relay network. In the DSA algorithm, subcarriers are allocated to the user-pairs with lowest achievable rate to satisfy the minimum rate requirement .We have developed its simulation framework by assigning the subcarriers and relays to the user-pairs depending upon their transmitting powers. 5.2 Future Work: Working on OFDMA technology to enhance its role in its competitive market is of great importance due to its high data rate feature.

How to Write a Disease Research Paper Outline

<h1>How to Write a Disease Research Paper Outline</h1><p>Writing an ailment inquire about paper diagram can be very overwhelming, particularly on the off chance that you are inexperienced with how to go about it. It is justifiable that on the off chance that you are attempting to get passing marks in your present class or you need to make a vocation in this field, you should excel on your paper composing. This is something that you have to consider ahead of time on the off chance that you need to expert your task or demonstrate to yourself that you have the right to go for a vocation in this field. So as to land the best position and you merit, there are sure things that you have to consider when you are composing an essay.</p><p></p><p>Before you even begin to compose your examination paper diagram, you have to initially evaluate the nature of your composed relational abilities. A few people have excellent correspondences aptitudes while a f ew people don't. On the off chance that you have poor relational abilities, you have to improve them. Along these lines, before you feel free to begin composing a framework, you should initially compose a short exposition that you can take as a practice.</p><p></p><p>If you are not happy with composing a blueprint for ailment inquire about paper, there are numerous spots where you can discover pre-composed layouts for this reason. A pre-composed blueprint for you can be downloaded from the web. These pre-composed layouts are normally simple to peruse and it is suggested that you basically reorder your own article into the template.</p><p></p><p>Before you feel free to begin composing your sickness investigate paper plot, you should initially figure out what sort of exposition you will compose. On the off chance that you are composing an exploration paper about a specific condition, you ought to choose the best possible point and the pa rticular needs of the crowd of the examination paper. It is ideal to choose the topic of the exposition admirably in light of the fact that it will characterize the general structure of the paper.</p><p></p><p>For your infection examine paper diagram, you ought to pick the subject of the paper cautiously. The theme should just comprise of a couple of sentences. You ought to likewise ensure that the paper is sorted out appropriately. Ensure that you separate the thoughts of the article and afterward make an understood making a beeline for discrete each section.</p><p></p><p>In request to augment the advantages of your exploration paper layout, you ought to follow a couple of steps. In the first place, you should utilize your own plans to break down the illness that you are expounding on. At the point when you are taking a gander at your disease, you ought to consistently allude to the manifestations that you are encountering, the medici nes that you are taking, just as the intricacies that you are experiencing at this moment.</p><p></p><p>After you have decided the subject of your framework, you should then feel free to make your blueprint. You can start your layout by composing a couple of sentences. The presentation is one of the most significant pieces of your diagram since it establishes the pace of the entire paper. Actually, this is the principal thing that you have to have when you begin composing a paper for your research.</p>

Financial Aid Essay Samples - How to Choose Them

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