The Complete List of Colleges That Require Interviews

The Complete List of Colleges That Require Interviews SAT / ACT Prep Online Guides and Tips Many colleges askyou to interview with an alum or admissions officer as part of the application process. This article has the full list of schools that require, recommend, or offer interviews, and it will give you some pointers onhow to figure out your college’s interview policy. To start off, let’s review the point of the college interview. Is your interviewer evaluating you, or is the meeting simply a chance for you to learn more about the school? Why Do Colleges GiveInterviews? Colleges hold interviews for a couple of different purposes. The most common perception is that interviews are meant to evaluate you. Your interviewer is sizing you up and will report back to the school with her two cents on whether or not you’d be a good fit. For the majority ofcollege interviews, this is mostly true. While a college interviewer doesn’t have a huge say in who gets in and who doesn’t, she does contribute to the decision by sharing herperception of your personality, strengths, weaknesses, and goals.Often the most selective schools use evaluative interviews, like Harvard (and most of the Ivy Leagues), Wesleyan, and Hamilton College. Most college interviewers aren't trying to put you on the spot, though. Rather, they use interviewsas a way to get to know you further, beyond the written component of your application. Rather thandrill you with questions, they often wantto engage you in conversation about your interests and passions. Interviewerswant to learn more about your goals and assist you in figuring out whether the college is the right place to achieve them.According to some colleges, the report from an interviewer almost alwayshelps your candidacy because it helps flesh you out as a multidimensional person. While most interviews are evaluative, some are merely offered to be informational. Informational interviews are offeredto help you learn more about the school and get all your questions answered bysomeone who attended. These interviews are meant to be for your benefit, and usually, interviewers don’t issue a report to any admissions committees. Some schools that offer purely informational interviews are Cornell, Vassar, and Colby. Colleges that consider interviews when they evaluate you typically require or strongly recommend the interview (for all intents and purposes, let’s just interpret â€Å"recommend† as â€Å"require†). Those that offer informational interviews often present them as optional. Flipped around, you can usually safely assume that a required interview is evaluative. Optional interviews are often more informational, with a few exceptions, like Tufts and Northwestern.If an interview’s optional, it’s still a good idea to set one up. Not only will you make a good contact and learn a lot, but you’ll be actively demonstrating your interest in the college! So to sum up, college interviews, like the Harvard interview, can be evaluative and consideredin admissions decisions, or informational, like the Cornell interview, and meant solely to teach you about the school. Evaluative interviews are also informationalin many ways;it’s definitely a good ideato prepare and ask questions and learn about the college. Regardless of what kind of interview the college offers, it will be your responsibility to set one up. How do you go about setting up your college interview? You might meet at a local coffee shop, where you can express your enthusiasm in cappuccino foam. How Do You Set Up an Interview? Most interviews are conducted by alumni of the college. These alumni live all over the country or internationally, so they’re able to meet with most students at their high schools or at a nearby coffee shopor library.When I interviewed, I met in a cafe, my local library, and two alums' houses - which, in retrospect, is kind ofstrange. Most colleges are clear that you should meet in a public place, not go to an interviewer'sprivate home. Colleges vary in their procedures when it comes to interviews. Some ask you to set one up after you’ve applied and they’ve begun to process your application. Others may ask you to indicate on your application whether or not you’d like to have an interview (these are the optional ones). More selective schools, typically those with required interviews, often want you to request an interview a few weeks earlier than your application deadline. MIT and Wellesley, for instance, set interview request deadlines in mid-October for students planning to apply early action and in mid-December for students applying regular decision. These deadlines are a couple of weeks earlier than your application deadline, so you’ll need to research the process at your prospective colleges early. If you have any interviews, you’ll have to keep track of the interview deadline, not just your overall application due date. Once you’ve made your request, the college will usually put you in touch with a local alum. Then you’ll set up a time and place that works for both of you. At this point, some readers may be sharinga very specific worry: what if there are no interviewers in myarea? If you don't have an interviewer close by, then the college simply tears up your application. KIDDING. If an interview's impossible, it won't negatively affect your chances in any way. What If You Don’t Have a Local Interviewer? Most students will have at least one interviewer in their area, at least for those schools that require interviews. Alumni networks are often wide-ranging. However, if you’re one of the few students that doesn’t have an alum in your area, many schools will allow you to have an online interview, typically over Skype or Gchat, or one on the phone. If this is the case, most schools share Brown’s view: â€Å"All interviews, whether in-person, at interviewing day, by phone or by Skype/G-Chat are considered equally by the Office of College Admission.† If an online or phone interviewdoesn’t work either for some reason, then don’t worry!Your inability to set up an interview won’t be held against you. Even if the interview’s required, schools aren’t going to punish you for where you live. Nor will it affect you negatively if there are simply too many applicants and not enough interviewers. Make every effort to meet interview request deadlines and/or set up an online meeting, but don’t worry if it’s just not possible. You can rest assured that it won’t detract from your application. Before getting into the full list of colleges’ interview policies, let’s first consider the rules at Ivy League colleges, all but one of which strongly recommend or require an interview. Ivy, the patron plant of perfect SAT scores. Interview Policies of Ivy League Schools If you’re planning to apply to Ivy League schools, then you know that their expectations are as rigorous as they come. Most require the maximum number of teacher recommendations and SAT Subject Tests, not to mention a high GPA, strong extracurricular background, and competitive test scores. Why wouldn’t they also require an evaluative interview as part of this intensive process? They would, and they do. For every school but Cornell, evaluative interviews are a required part of the application process.Admissions committeesaren’t too transparent about exactly how much interviews count toward the decision. An interviewcertainly shouldn’t make or break your application or even count all that significantly in the admissions decision, but when applying to such selective schools, every aspect counts. A great interview could give you a competitive edge over another applicant with similar credentials. The chart below shows the interview policies of the eight Ivy League colleges. As mentioned above, you should pretty much consider â€Å"recommended† to mean the same as â€Å"required.† Click on a school’s name if you’d like to read its official statement on college interviews. College Interview Policy Interview Purpose Brown Required Evaluative Columbia Required Evaluative Cornell* Required for Architecture program and the School of Hotel Administration, recommended for the Art program Informational Dartmouth Recommended Evaluative Harvard Required Evaluative Princeton Recommended Evaluative University of Pennsylvania Required Evaluative Yale Recommended Evaluative *Cornell is the only Ivy League school that doesn’t schedule interviews for a majority of candidates. Cornell makes sure to emphasize that its interviews are informational, rather than evaluative: "Once you apply to Cornell, an alumnus or alumna in your area may contact you to schedule a time to talk. While this optional, informal conversation helps the admission committee get to know you better, its main purpose is to give you an opportunity to ask any questions you may have about Cornell. This meeting does not serve as an admissions interview.† Since we’re already talking about the interview policies of Ivy League schools, let’s also take a closer look at other highly selective colleges that require interviews as part of their admissions processes. If you’re applying to any of the Ivies, you might also have one or more of the schools below on your college list. What Goldilocks wasto porridge, these schools are to their applicants. This mayhave made more sense in the old days of SAT analogies. Want to build the best possible college application? We can help. PrepScholar Admissions is the world's best admissions consulting service. We combine world-class admissions counselors with our data-driven, proprietary admissions strategies. We've overseen thousands of students get into their top choice schools, from state colleges to the Ivy League. We know what kinds of students colleges want to admit. We want to get you admitted to your dream schools. Learn more about PrepScholar Admissions to maximize your chance of getting in. Interview Policies of Highly Selective Colleges Some of the following schools require interviews, while others simply recommend them or offer them as an option. As mentioned above, it’s always a good idea to seize an opportunity to demonstrate your interest ina school. Especially with these highly selective schools that use holistic admissions processes, it’s always helpful to reveal more of who you are, what motivates you, and why you’re enthusiastic to attend. And remember how I said to read â€Å"recommended† as â€Å"required†? MIT hints at the same interpretation: â€Å"We don't just want to see how you look on paper: we're interested in the whole person†¦.Interviews are strongly recommended. In fact, last year, of eligible applicants, we admitted 10.8% of those who had an interview (or who had their interview waived) but only 1% of those who chose not to interview.† Loud and clear, MIT. Interviews matter. The schools with optional, informational interviews aren't so intense. While I’d still advise you to take advantage of the offer, it shouldn’t negatively impact your application if you don’t choose to schedule an interview with them. Check out the chart below for the interview policies of some selective colleges. As with the info above, you can click on the school’s name to go to its official site and learn more about how its interview process. College Interview Policy InterviewPurpose Bates College Recommended Evaluative Bowdoin College Recommended Evaluative Carnegie Mellon Recommended Evaluative Colby College Recommended Evaluative Colgate University Optional Informational Connecticut College Recommended Evaluative Duke Recommended Evaluative Emory Recommended Evaluative Georgetown University Required Evaluative Hamilton College Recommended Evaluative Haverford College Recommended Evaluative Johns Hopkins Optional Informational Middlebury College Recommended Evaluative MIT Strongly recommended Evaluative Northwestern Optional Evaluative Pomona Recommended Evaluative Rice Recommended Evaluative Stanford Optional Evaluative Swarthmore College Recommended Evaluative Trinity College Recommended Evaluative Tufts University Optional Evaluative Union College Recommended Evaluative University of Chicago Recommended Evaluative University of MichiganAnn Arbor Recommended for applicants to College of Engineering Evaluative Vanderbilt Optional Evaluative Vassar College Optional Informational Wake Forest University Recommended Evaluative Washington University in St. Louis Optional Wellesley Recommended Evaluative Wesleyan University Recommended Evaluative Many of the schools on the above list are highly selective, and many of them encourage applicants to interview so they gain a more complete sense of each student as a â€Å"whole person.† Other schools have different purposes for interviews, as you’ll seebelow. Gather round! We're heading tothe full list of colleges that require interviews. Full List of Colleges That RequireInterviews Like the schools above, most of the schools on this complete list use interviews to evaluate a candidate as part of their admissions process. While interviews help admissions committees get orknow a student better, they may also have more specific purposes. Some interviews are meant to help an applicant with academic and career planning. Many art, design, and performance schools on the list below hold interviews to review and discuss a portfolio. For instance,Moore College of Art and Design and Milwaukee Institute of Art and Design hold this kind of portfolio review interview. Religious institutions, likeBrigham Young University, Gordon College, and Yeshiva University, talk to a candidate about her religious beliefs and the kind of commitment she can make to their community. Others, like Bard College at Simon's Rock and Naropa University, are looking to get to know candidates better and gauge their overall fit with their very unique college communities. I’ve provided the full list below, along with the purpose of interviews for most of the schools that offer them. If you can fill in any of the blanks, let me know in the comments! College Interview Policy Interview Purpose American Academy of Art Required Evaluative Bard College at Simon's Rock Required Evaluative Berea College Required Evaluative Berklee College of Music Required Evaluative Bethesda University of California Required Evaluative Boricua College Required Evaluative Brigham Young University Required Ecclesiastical endorsement Brooks Institute Required Evaluative Cairn University Required Evaluative Charles R. Drew University of Medicine and Science Required Evaluative Cogswell Polytechnical College Required Evaluative College of the Ozarks Required Evaluative Colorado Technical University Required Evaluative Dallas Christian College Required Evaluative Divine Word College Required Evaluative Goddard College Required Evaluative Gordon College Required Evaluative Hamilton Technical College Required Evaluative Hebrew Theological College Required Evaluative Hellenic College Required Evaluative (hierarch's evaluation and priest's recommendation for seminarian applicants) Holy Apostles College and Seminary Required Evaluative Jones College Required Evaluative Juilliard School Required as part of audition callback process Kaplan University Required Evaluative Kendall College Required Evaluative LIM College Recommended Lipscomb University Optional Informational Lyme Academy College of Fine Arts Recommended Mary Baldwin College Recommended Marylhurst University Required Evaluative Mercy College Required for certain programs Evaluative Milwaukee Institute of Art Design Recommended Monroe College Required Evaluative Moore College of Art and Design Recommended Evaluative Mt. Sierra College Recommended Naropa University Required Evaluative Northwest College of Art and Design Required Informational Paier College of Art Required Evaluative Paul Quinn College Required Evaluative Point Park University Required for applicants to stage-management and technical theatre/design Evaluative Pontifical College Josephinum Required Evaluative Rocky Mountain College of Art Design Required Evaluative Sacred Heart Major Seminary Required Evaluative Santa Fe University of Art and Design Required Evaluative Shimer College Required Evaluative State University of New York Upstate Medical University Required Evaluative Stevens Institute of Technology Required for Accelerated Pre-Medicine applicants, optional for all other applicants Evaluative Sullivan University Required The King's College Recommended United States Air Force Academy Required Evaluative United States Naval Academy Required Evaluative University of North Carolina School of the Arts Required Evaluative University of Waterloo Required for School of Architecture Evaluative VanderCook College of Music Required Evaluative West Coast University Required Evaluative Western Governors University Required Evaluative Westwood College Required Evaluative Yeshiva University Required Evaluative Since there are thousands of colleges across the US and admissions policies are always changing, it’s important for you to be able to track down this kind of information on your own. If you have questions about a school that’s not on this list or want to learn more about a prospective college’s interview policies on your own, how can you go about finding this information? How can you bring your school's interview policy front and center? How to Research College Interview Policies If you click on the names of any of the colleges above, you’ll be brought to its official admissions page, specifically one with information about college interviews. By simply going to your colleges’ official site and locating the page with information on applying, you should be able to learn more details about each step of the process. If this information is not readily available, then you should contact the admissions office by email, a form on its website, or phone call (usually the fastest option during business hours). Ask the office about their policies around interviews - or any other questions you have. Make sure to investigate at least a month before your application deadlines - as you saw above, interview request deadlines can be weeks earlier than application deadlines. You may also search for other students’ experiences with interviews on discussion forums like College Confidential. Students may share questions they were asked and how they prepared, though keep in mind that every alum interviewer may be different. Some colleges that require interviews or offer them give helpful suggestions for questions you might be asked on their websites, and you can find other prompts online and practice what your responses. Once you know exactly when and how to set up your interview, spend some time preparing questions and answers. That way you can make the most of the conversation, connect with your interviewer, and demonstrate both your qualifications and enthusiasm for your college of choice. What’s Next? Apart from practicing your answers to common interview questions, you should prepare some thoughtful questions to ask your interviewer. But you don’t have to come up with them all on your own! This helpful guide contains some of the best questions to ask your college interviewer. In addition tothe interview, you have plenty of other steps to take when putting together your application.For a complete overview, check out our guide to the entire college application process, step by step. Are you a top student aiming to get into the Ivy League? This Harvard alum shares exactly what it takes to get accepted to Harvard and other Ivy League schools. Want to improve your SAT score by 160points or your ACT score by 4 points?We've written a guide for each test about the top 5 strategies you must be using to have a shot at improving your score. Download it for free now:

Management and Business1 Essay Example | Topics and Well Written Essays - 1500 words

Management and Business1 - Essay Example The company’s offices will be established at Canada in the first year of operation to reduce costs. The founder, who is a professional engineer, has 18 years of responsible and progressive experience (Alleny 130). The company has notified major clients to be major construction companies, real estate companies, local and state governments, and water companies. We believe by focusing on these institutions, which have special needs. We will be capable of bettering our service to clients and producing a superior service that is more efficient and effective than other structural firms (Pinson 70). Our mission is to provide structural engineering services to clients across the United Kingdom. The engineering services to offer will be for all types of buildings, ranging from concept planning to completion. The company will use highly skilled and professional team working together, using practical experience and common sense to undertake its projects. The StructureAll Limited will provide innovative approaches to structural engineering services and it will build a long-term relationship with the company’s clients, delivering excellent services in time and in cost-effective manner (Alleny 130). StructureAll limited will offer complete civil and structural engineering services. The company will put most focus on the residential, commercial and industrial sectors.The company will deal with projects, which will involve renovations, rehabilitation, additions, and new construction. The company offers economical and innovative design services while maintaining the state-of-the-art design technology. In addition, structureAll offers cost effective and good quality services in engineering design, project management and construction and construction management (Flyvbjerg, Holm, and Buhl 131). Start-up expenses will allow for initial legal

BBC in 1920s and 1930s Essay Example | Topics and Well Written Essays - 2000 words

BBC in 1920s and 1930s - Essay Example [1] [3] [4] John Reith was chosen as general manager and the company later became the British Broadcasting Corporation in 1927 when it was granted a Royal Charter of incorporation and ceased to be privately owned. It started experimental television broadcasting in 1932 and finally in 1936 began commercial operation. [1] [3] [4] Since BBC was doing great, it awarded a second TV channel, BBC2, in 1964, renaming the existing channel BBC1. BBC's monopoly on radio services persisted until the 1970s. Starting in 1964 a series of pirate radio stations came on the air, and forced the UK government to finally deregulate radio services. In response the BBC reorganized and renamed their radio channels. As well as the four national channels, a series of local BBC radio stations was established. [1] [3] [4] Since the deregulation of the UK television and radio market in the 1980s, the BBC started to face greater competition from the commercial sector, especially on satellite television, cable television, and digital television services. [1] The credit of the early success of the company goes to the BBC Research Department which has played a major part in the development of broadcasting and recording techniques. In the early days it carried out essential research into acoustics and programme level and noise measurement. [1] [3] [4] The BBC is a Public Corporation operating as a public service broadca... The BBC is required by its charter to be free from both political and commercial influence and to answer only to its viewers and listeners. [1] [3] [4] Goals in 1920s and 1930s BBC was established in 1922 and its earliest goal (as with most companies) was to survive. BBC started off with its radio service, which was the first of its kind. The national service which BBC provided could only be heard by the few who had radio receivers. Therefore as beginner BBC's objective was to firmly establish itself as a known company and promote the technology to the audiences. As the technology progressed and more people got interested in the entertainment provided by BBC, the goals of the company matured as well. For the purpose of better understanding these goals are broken down into separate headings and the goals specified are presented in a chronological order. Economic goals As mentioned above, as a new company starting in 1922, the aim of BBC was to survive the initial excursion into the unknown world of radio public service. After creating the stirring in the British elite circle (because this service could only be afforded by the elites initially), the economic goal of BBC changed towards enlarging its scope and expanding into bigger markets. By late 1930s BBC's economic goal was to earn through its radio and T.V. broadcasts without interference from commercial pressures. Governmental goals In 1926 the first royal charter was given to BBC to function. This charter was an understanding to promote governmental goals as well as BBC's own goals. The British monarch used the radio to forge a link between the dispersed and disparate listeners and the symbolic heartland of

Modulation Systems Used In Satellite Communications Computer Science Essay

Modulation Systems Used In Satellite Communications Computer Science Essay Satellite is the one of the greatest means of communication carrying a large chuck of voice and data stream from one part of the horizon to the other as compared to other medium. In this modern age, communication satellite networks are an indispensable part of the major telecommunication systems. Satellite interconnects the nodes and provides some better advantages in application than the traditional communication systems such as interconnecting large traffic nodes (e.g. telephone exchanges), mobile communication and provision of end to end connections directly to users, television and sound broadcast directly to the public [1]. To provide the optimum quality of services (QoS) different types of design techniques needs to be consider for different purposes like distinct types of modulation and coding (channel and source) techniques are used for specific purpose, link budget calculations, selection of radio frequency (RF) etc. Other dominating factors are: permitted earth station size and complexity, the size and the shape of the service area etc [2]. The objective of this paper is to describe different types of modulations systems using for satellite communications. In this report, first I am trying to give some basic information related to the modulation systems and then bring all possible modulation schemes used in satellite communications. Modulation: In general view, modulation is the process where the characteristics (phase, frequency or amplitude) of the high frequency carrier are varied in accordance with the baseband signal. The baseband signal carries the basic information such as the output of video camera, voice coder or digital television. In practical point of view, it is more convenient to carry the modulation at the intermediate frequency-typically 70MHz [1]. Satellites are usually operate at Gigahertz range of frequency and the modulation signals are up-converted to the transmission frequency and amplified before going on air [1].The term modulation is also used to describe certain types of baseband processing like Pulse amplitude modulation (PAM) or Pulse Code modulation (PCM) [2]. Modulation Systems for Satellite Communications: We can divide the modulation systems in two broad categories like Analogue Modulation and Digital Modulation Analogue modulation is Amplitude Modulation, Frequency Modulation and the phase Modulation. Digital Modulation is divided into several categories and each of those uses in specific purpose. Analogue Modulation: Let consider a sinusoidal wave f(t): f(t) = A cos {2*à Ã¢â€š ¬*f c(t)+ÃŽÂ ±}..(A) Where A is the amplitude, f c is the carrier frequency and theta is the phase of the wave with respect to the information signals. When the amplitude of the carrier wave is changed, then the wave is called amplitude modulated and scheme is known as the amplitude modulation. Likewise when frequency or phase of the wave is altered then it called frequency modulated and phase modulation respectively and techniques are known as frequency and phase modulation respectively [1]. Amplitude Modulation: As mentioned above, a carrier wave is said to be amplitude modulated when the amplitude of the carrier varies with respect to the baseband signal. An amplitude modulated signal can be given as V(t)= A{1+m(t)}cos (2*à Ã¢â€š ¬*fc) (1) In equation (1), m(t) is the message signal and the fc is the carrier frequency. A{1+m(t)} is the amplitude of the carrier and it varies accordance with the signal m(t). If m(t) is the sinusoidal signal and Am and fm is the amplitude and the frequency of the m(t) respectively, then it can be written as follows V(t)= A{1+Am sin2*pi*fm}cos (2*à Ã¢â€š ¬*fc) .(2) The spectral efficiency of V(t) can be obtain by expanding equation (3) and it can be shown that there are two side bands in the spectrum like upper and lower. The upper and lower sidebands consists of same spectral shape as that of the message signal m(t) [1]. The main advantages of the AM is that amplitude modulated carrier can be easily detected by using a simple envelop detector. An envelope detector is the simple large time constant RC circuit. But the difficulty is that AM modulation is rarely use for satellite communications because [1]: An amplitude modulated signal is very susceptible to the signal fluctuation It requires very high Signal to Noise ratio for desire amount of quality. AM is used in laser inter-satellite links (ISL) in an alternate form called ON-OFF keying. There are two forms of AM systems: Double Side Band Suppressed Carrier (DSB-SC) Single Side Band Modulation (SSB) In DSB-SC the carrier frequency is suppressed and only side bands are transmitted. In this case the amplitude of the wave does not follow the amplitude of the signal and as a consequence of that it reduces the simplicity of the demodulation in FM. DSB-SC is not used in the satellite communications but this technique is good for understanding the SSB modulation [1]. SSB is another alternative form of the AM systems. This technique is suitable for the application where the bandwidth is the premium. In AM modulation, both the side bands consist of baseband information and transmission of same information twice showing the redundancy. In this case, SSB modulation, this redundancy is cut-off by removing one of the sideband so the bandwidth of the RG signal is same as the bandwidth of the baseband signal. Sometimes the carrier is also removed then it is called SSB-SC (suppressed carrier) [1]. SSB is detected at the receiver end using synchronous detector. There are two factors playing an important role to make the SSB suitable for the satellite communications: occupied bandwidth and the required carrier to noise ratio. The most common application of the SSB in the satellite communication is to multiplex voice signals into a composite baseband signal. Another form of SSB is using in the mobile satellite communication is known as the ACSSB (Amplitude C ompanded SSB) because in mobile satellite service efficiency of the bandwidth is desired. Frequency Modulation: The FM systems are widely used in satellite communications. FM system is appropriate for those cases where the baseband signals are in analogue form. In FM, frequency of the carrier signal is varied with the message signal[1]. This scheme exploits where simple receivers are essential for transmission of the digital data[4]. An example is Inmarsat Paging system because an important requirement of the paging system is the need for simple, low-cost and rugged receiver [1]. The most common methods of modulation used in the fixed-satellite service are FM for analogue signals [5]. FM has been largely used in satellite communications. It is particularly convenient when a single carrier per transponder is used and where the constant envelope of the FM signals allows the power amplifiers to operate at saturation, thus making maximum use of the available power.[5] Digital Modulation: In digital modulation techniques baseband signals can be modulated by altering the one or more of its basic parameter: amplitude, frequency and phase. According to this there are three basic modulation schemes in digital modulation like Amplitude Shift Keying (ASK), Frequency Shift Keying (FSK) and Phase Shift Keying (PSK). There are many variations and combination of these techniques. The combination of ASK and PSK is also known as the QAM (Quadrature Amplitude Modulation).Table: 1 below showing list of some digital modulation schemes. Some of the schemes can be derived from more than one parent schemes [3]. Abbreviations Alternate Abbreviations Descriptive names FSK BFSK MFSK FSK Frequency Shift Keying (Generic name) Binary Frequency Shift Keying M-ary Frequency Shift Keying PSK BPSK QPSK OQPSK à Ã¢â€š ¬/4-QPSK MPSK PSK 4PSK SQPSK Phase Shift Keying (Generic Name) Binary Phase Shift Keying Quadrature Phase Shift Keying Offset QPSK, Staggered QPSK à Ã¢â€š ¬/4 Quadrature Phase Shift Keying M-ary Phase Shift Keying CPM SHPM MHPM LREC CPFSK MSK LRC LSRC GMSK TFM CORPSK FFSK Continuous Phase Modulation Single h (modulation index) phase modulation Multi h phase modulation Rectangular pulse of length L Continuous phase frequency shift keying Minimum phase shift keying, Fast frequency shift keying Raised cosine of pulse of length L Spectrally raised cosine pulse of length L Gaussian Minimum shift keying Tamed frequency shift keying Correlative PSK QAM ASK Quadrature amplitude modulation Amplitude shift keying QORC QOSRC SQORC Q2PSK UF-OQPSK TSI OQPSK SQAM XPSK Quadrature overlapped raised cosine modulation Quadrature overlapped square raised cosine modulation Staggered QORC Quadrature Quadrature phase shift keying Inter-symbol interference/Jitter free OQPSK Two symbol interleaved OQPSK Superposed QAM Cross-correlated QPSK Table: Digital Modulation using in satellite commiunications. As the advance in technology and limitation of analogue modulation it is now most of the satellite using digital modulation techniques and providing some advantages over analogue modulation like better performance, error detection and correction efficiency, signal to noise ratio etc. So in this paper focus are mainly given to the various types of digital modulation systems. We can divide digital modulation systems into two large categories [1]; Constant Envelop Modulation and Non- Constant Envelop Modulation and The constant envelop class is generally considered as the most suitable for the satellite communications because it minimizes the effect of non-linear amplification in the high power amplifier like TWTA (Travelling Wave Tube Amplifier) or KTA (Klystron Tube Amplifier). In this case the generic FSK is not suitable for satellite communication because it has very low bandwidth efficiency as compared to PSK systems [5].In this section of the report a brief description of different types of digital modulation systems using in satellite communication is given. PSK BPSK QPSK: In PSK system, envelop is constant but the phase changes discontinuously from symbol to symbol. There are two types of classic PSK schemes like BPSK (Binary PSK) and QPSK (Quadrature PSK). Generally, PSK modulation systems with M-ary signals can be used and its known as MPSK [5]. MPSK is more suitable than MFSK because it provides better Power Nyquest efficiency than MFSK. In mobile satellite communication, the most commonly used digital modulation system have been BPSK and different forms of QPSK. It is not surprising that higher order modulation are providing the better performance and efficient as well but they are more sensitive to the channel impairments. Recently, higher order PSK, 16-QAM is using for this purpose. [1] PSK modulation systems easily represented in the I-Q plane where I and Q axes are normal to each other. One point in I-Q plane is providing the information about the signal state [1]. PSK scheme include two basic techniques like BPSK and QPSK. In BPSK one binary code is represented by the two phases 0 and 180 where in QPSK two binary codes is represented by the four phases: 0, 90, 180 and 270. In multi level PSK, the higher the order the more requirement of power to achieve the same amount of performance [5]. PSK is using for satellite communication because PSK signal can be transmitted through the non-linear channel of a satellite and it depends on the proper choice of the modem filters [5]. Other types of modulation systems use in satellite communications are Quadrature schemes where the modulated signals are represented in terms of two channels like I and Q. Three schemes of Quadrature modulation are given below. OQPSK, offset QPSK or OKQPSK (offset keying QPSK), also known as the SQPSK (Staggered QPSK), is a modified form of QPSK. In the OQPSK, the value of Q and I channel not changing at the same instant because the value of the Q-channel baseband is delayed by the duration of one symbol. By using this property, OQPSK signals provide the reduction of the non-linear distortion when passing through non-linear element. So in this case, a better performance can be expected in the non-linear satellite channel as compared to the QPSK [7]. In OQPSK systems, maximum phase change is limited to 90. Its one of the reasons why OQPSK is advantageous for satellite channels and is used in satellite links [1]. MSK (minimum shift keying) is another coherent frequency shift keying modulation systems with modulation index 0.5. It also shows the non-linear property through a non-linear satellite channel and the signal has constant envelop.[5] MSK is spectrally more efficient than the QPSK and OQPSK because its spectrum has wider main lobe than QPSK and OQPSK [9]. QAM: It is seen that as there is a very limited bandwidth available for the satellite channels, the research for spectrally efficient modulation technique is essential for this application. Here QAM is used with the modified signal constellations for wideband satellite communication systems. [8] Because of its constant envelop to combat the non linearity of the satellite channel; M-ary phase shift keying is conventionally used in digital satellite communications systems. But when higher spectral efficiency is expected it cost more power than the other schemes. The main objective of modifying the QAM signal constellation is to reduce its sensitivity to the channel non linearity [8]. FSK: As described above, in Frequency Shift Keying systems, frequency is shifting in accordance with the message state change [1]. Binary Phase Shift Keying (BFSK) is the simplest form of the FSK allowed only two frequency states and this system can be extended to M level of frequency shifting then it is known as the M-ary FSK. In M-ary FSK N numbers of bits are combined to form a symbol. [1] M-FSK is a power efficient modulation technique which power efficiency can be increased by increasing the number of frequencies (M) at the cost of additional complexity and smaller bandwidth efficiency. This modulation system is found appropriate for some low rate and low power applications such as Global paging via satellite communications [10]. M-FSK can be used for in land mobile satellite communications where the numbers of user are stationary. It is valid for low data rate application like paging via satellites [10]. OFDM (Orthogonal Frequency Division Multiplexing) Modulation OFDM is a mature digital multi-carrier modulation technique has been used in physical layer of broadband wireless air interface standard like IEEE 802.11/Wi-Fi and 802.16/WiMax as well as digital video broadcast-Terrestrial DVB-T [11]. Simultaneously, OFDM modulation is attracting more attention for satellite communications and now it is using for DVB-TH. OFDM modulation systems also use in Military satellite communication. Coded Orthogonal Frequency division Multiplexing Modulation (C-OFDM) A COFDM modulation system is resistance to the frequency selective fading. This type of fading is seen in the wideband mobile communications. This system is useful for the digital audio and video broadcasting over a long distance. In future, C-OFDM systems would be one of the candidates for direct sound broadcast satellite systems [1]. Trellis Coded Modulation (TCM) Error correction coding and modulation are combined in Trellis coded modulation systems. To transmit information over the power-limited and band-limited channel, the modulation and the channel coding must be optimized jointly [12]. TCM with Octal Phase Modulation or 8-PSK 8-PSK is a constant amplitude modulation system with higher bandwidth efficiency. The first TCM application to satellite transmission occurred with the 8-PSK trellis codes. Using a 72 M Hz transponder bandwidth, transmission at up to 155.52 Mbits/s have been realized [5]. TCM with 8-PSK provides high bit rate which is essential in future for the high bit rate application like images, TV and HDTV services over the satellite transmission [5]. There are various forms of TCM like PTCM (pragmatic) and PPTCM (Punctured PTCM). The PTCM codes are interesting for satellite transmissions. As an example, a new coding systems using the PTCM 2/3-8PSK code concatenated with Reed -Solomon code in the INTELSAT IDR service and is expected to increase the capacity up to 25% base on the standard A earth station and INTELSAT VII space segment conditions [5]. As the demand is increasing for higher bandwidth efficiency, the QAM trellis codes could find the potential applications in HDTV satellite transmissions in the future. But the main limitation of trellis codes applying in the QAM using in the satellite communications is their non-constant amplitude and more distortion occur when pass through the NLA (Non-linear amplifier) [13]. A precise amplitude control must be used in the receiver end [5]. Trellis coded 16-PSK and 16-QAM modulation systems are used for satellite communications. But the fact is that when the modulation level increases, the constant envelop M-ary PSK modulation systems are inferior to the QAM systems. On the other hand, QAM suffers more distortion in the non-linear satellite communications channels [14]. QAM is suitable for geostationary orbit satellite channel with only Gaussian impairments because of being amplitude and phase modulated signal, QAM is more sensitive to the effects of interference and fading than MPSK [15]. Single Channel Per Carrier FM Modulation with syllabic Companding (SCPC FM) The main advantage of using SCPC FM modulation with syllabic Companding in satellite communication is to increase the limited capacity and this capacity increment is fully depends on the syllabic companding. The compadors in the transmission side take a wide volume of speech signals and reduce by the compressor with small amount of deviations. As a consequence of that in the same bandwidth it would be possible to employee more channels for transmission. And at the receiver end , the expender returns the original voice signals and during the speech pauses suppress the noise link[16]. This bandwidth efficiency can also be applied to the domestic satellite systems where the use of a small earth station and a large number of routes operating with few channels are important [16]. In future for the larger satellite (IntelSat IVA or V), the inefficient use of bandwidth of satellite channel by small carriers, especially in the transponder one of the factors which limits the total achievable capacity of bandwidth. In this case, the use of a SCPC companded FM would significantly increase the total capacity of the satellite bandwidth without increasing the total segment cost of the earth stations like other modulation systems [16]. From research it can be shown that the use of SCPC FM with compandors will significantly improve the economic scenario associated with the small earth stations. Wavelet Packet Modulation (WPM): WPM is a multicarrier modulation system like OFDM using Discrete Wavelet Transform (DWT). DWT is a transformation technique which is a presentation of the composite signal in time and frequency domain. So in WPM, packets structure is divided into time and frequency domain. So when any interference is realize, in TDMA or FDMA system all packets are degraded but in case of WPM, packets are keep away from the interference with the help of providing the appropriate packet structure [17]. Both WPM and OFDM are multicarrier modulation system but the difference is OFDM uses FFT to combine the transmission where WPM use DWT and Bit Error Rate (BER) of WPM is much better than the OFDM. Similarity between these modulation systems is High Peak to Average Power Ratio (PAPR). For improving the performance of OFDM, single carrier OFDM (SC-OFDM) is proposed where decreasing PARP was the main goal. It is seen that the PARP is also high in WPM so SC-OFDM can be used to improve efficiency of the WPM. SC-WPM also can be used by exploiting the principal of SC-OFDM [17]. Some experiment shows that the WPM is the effective modulation systems for satellite communications and with lower PARP, SC-WPM would enable the broadband satellite communications [17]. PARP performance of SC-WPM is superior to WPM and OFDM. The BER performance of the WPM is better than OFDM. Multi-Level Gaussian Frequency Shift Keying (MGFSK) MGFSK is a modulation systems use in the satellite communications. It also exploiting the technique of narrow band FM which has constant envelop throughout the signal. MGFSK is suitable for satellite communications where the transponders are in saturations and it is also useful for the transmitter where output amplifier is also saturated [18]. As compared to the 8PSK bandwidth efficiency (3 bit/s/Hz), MGFSK providing bandwidth efficiency is 6 bit/s/Hz [18]. BW efficiency of MGFSK is very similar to the 64 QAM but 64 QAM is not feasible to use in satellite communication because it requires highly linear and well-equalised satellite channels [18]. The key applications of MGFSK are in those satellites which trucking of ISP backbone traffic, satellite news gathering and military satellite applications. Pulse Code Modulation (PCM) Pulse code modulation system is another technique which is employed in the satellite communications. Here in PCM the main aim is to coding the analogue signal for digital representation and then transmitter by using digital techniques. In PCM, analogue signals are sampled in a periodic manner of time in a rate of Nyquest Sampling rate (twice the highest of baseband frequency) and then quantized in agreed manner. To keep the error in certain level, quantization step should keep as low as possible. [5] Different types of pulse code modulation are seen like DPCM and ADPCM. Other Modulation Systems use in Satellite Communications Delta modulation (AM), Pulse amplitude modulation (PAM), Pulse Time Modulation (PTM) etc. Spread Spectrum modulation systems are closely related to the PCM [1]. Conclusion: In this report it has been trying to make an overview of the modulation system used in the satellite communication channels. A different type of modulation systems has been described. The selection of modulation systems is depends on the various factors like type of the channels, constraints imposed by the earth stations (for fixed satellite, direct broadcast services and mobile satellite services), hardware limitations etc [1]. One fundamental characteristic of the satellite communications channels is the trade-off between the bandwidth and the power to obtain the received signal with certain level of quality. In case of the bandwidth limited channels, spectrally efficient modulation systems are used where penalty is paying for additional carrier power. In the power limited links, bandwidth efficient modulation is using which related to the hardware constraints as well. References: [1]. Raicharia, M.,[ 1995] Satellite Communication Systems: Design Principles, 2nd Edition, 1999, ISBN:0-333-74722-4, Macmillan Press Ltd,Baisingstoke, RG21 6XS. [2]. Couch, L W., Digital and Analogue Communication Systems, 5th Edition. 1997, Prantice Hall, Upperside river, NJ-07458, ISBN: 0-13-522583-3. [3] . Fuqin, Xiong., [August, 1994] Modem techniques in satellite communications, IEEE Communications Magazine, p. 84-98. [4]. Fthenakis, E., Manual of the Satellite Communications, McGraw-Hill Inc, 1984. [5]. Handbook of the Satellite Communications (HSC), 3rd Edition, pp: 242-275, http://www.scribd.com/doc/7047432/Handbook-on-Satellite-Communications, Last Visited 25.03.10 [6]. Taggart, D., Kumar, R., Cooper, L. , Wagner, N., Goo, G., Affects of Tone interference on the performance of QPSK and 8-PSK modulation in satellite communications, 2004, Arospace Conference, 2004. Proceedings. 2004. IEEE. [7]. Juing, Fang., [March, 1996] The other digital modulation techniques. ITU-R, Doc. 4HB/14, 25-28 March 1996. [8]. Kim, J., Liu, J,. Kwatra, S.C., Quadrature Amplitude Modulation Schemes with Modified Signal Constellations for a Wideband Satellite Communications, Military Communication Conference, 1995. MILCOM, 95. Conference Record, IEEE. [9]. Pasupathy, S. Mimimun Shift Keying : A Spactrally efficient Modulation, IEEE Communication Magazine, 1994, Vol 17, Issue:4, pp:16-22. [10]. Khalona, R.A., performance of a M-ary fsk modulation in a land mobine satellite communcaitin channel, Universatl personal Commuinication, 1994, pp: 430-434. [11]. Ludong, W; Jezek, B., ofdm modulation tecnnique for military satellite communciations, Military Communications Conference, 2008. MILCOM 2008. IEEE , 2008, pp: 1-7. [12]. Ungerboeck, G., [January, 1982] Channel coding with multilevel/phase signals, IEEE Trans. on IT-28. [13]. [Flash-TV] Flash-TV: Flexible and Advanced Satellite Systems for High Quality Television, with Interconnection with IBCNs, Race-II Project R2064. [14]. Benedetto, S.; Pent, M.; Zhang, Z., trellis coded 16-psk and 16-qam modualtion for satellite communicaiotns, Global Telecommunications Conference, 1988, and Exhibition. Communications for the Information Age. Conference Record, GLOBECOM 88., IEEE , 1988, Vol: 1, pp: 125-130. [15].Evans, B.G., Satellite Communication Systems, 3rd Edition, 2008, ISBN: 0-85296-899, Lightning Source UK Ltd. Milton Keynes. [16]. Evans ,B.G., Kernot ,R.J., Satellite-communication system employing single -channel /carrier frequency modulation with syllabic companding, IEE,1975, Vol: 122, Issue: 7, pp: 703-709. [17]. Sakakibara, H.; Okamoto, E.; Iwanami, Y., A Wavelet Packet Modulation Method for Satellite Communications, TENCON 2005, IEEE region 10, 2005, pp:1-5. [18]. Fitch, M., Boyd, I., Briggs, K., Steitiford, K., Gaussian multi-level FM for high-bandwidth satellite communications, University college of London (UCL), http://keithbriggs.info/documents/MGFSK_paper1_IB2_mrf-feb27.pdf, last visited: 27.03.10.

Ethics and Technology Essay

The biggest limitation of our existing system is its inherent inability to achieve its fundamental goal. Whatever happened to the dream of progress that modern technology would free people from drudgery, and everyone would be able to live in comfort, spending their time enriching the world and thinking great thoughts? Wasn’t that what we really set out to achieve? Toward that goal, we can now make virtually any region of the earth comfortably habitable. We can produce food and clothing in staggering quantities, at unbelievable rates of production, using very little labor in proportion to the output. We have greatly extended the life span of our species, and we know how to cure or eliminate the suffering of a great range of diseases. We can communicate around the globe in less time than it takes to hear the voice of someone across a room. An interesting question to consider is this: if the technology necessary to live this way really could be developed, would it result in such a society? Starting from our present society, I would say â€Å"absolutely not. † The technology that could easily feed the world would probably result in mass starvation. The competitive system can produce the tools we need to create a future of freedom and enlightenment, but unless the system evolves, it will work against our using those tools to the benefit of humanity. The system must evolve. We’re not spreading the benefits of advancing technology, we’re using it to exclude more and more people from the fruits of progress. Instead of laying off the â€Å"excess† workers and increasing the stress on those left behind, consider what would happen if we simply reduced the burden on everyone. We don’t need to throw out our traditions of free enterprise and individual responsibility. We just need to revisit our vision of progress and see where we want to go, and where we’re heading. Not all technology is hampering the society’s progress. Technology was developed to ease man’s work and provide him with a little help . It wasn’t invented so that we could just copy and paste an essay for our next paper, or download a ready made presentation from the internet or make google do all things for us. The web is what you make of it, you can’t blame technology for ruining your work ethics. It’s you who’s become super lazy and dependent I am from a time when technology is called â€Å"progress† and it was considered heretical to doubt its benefits. We tend to forget the years before antibiotics when people died from pneumonia and infections. We take for granted the warnings about kidney failure, liver damage and replacement therapy for intestinal flora that accompany today’s â€Å"bigger and better† medications. Technology has made our lives very easy, but it turn, has made us lazy. I believe that if we continue to make and improve technology, there can be some really useful inventions. However, we can make sure that the improvements don’t make us lazy, in very simple ways. We can ask ourselves, does this pen that writes down our thoughts and tells us how to spell correctly really need to be in everyone’s daily lives? Technology moves at a pace that can easily outrun ethical standards surrounding its use. The effects of technology on work ethics move at a similar pace with employers moving to establish ethical boundaries that seem to infringe on employee privacy rights and restrict communication abilities. These tactics have led to courtroom battles, quick job terminations and complaints filed with the National Labor Relations Board. Special Purpose: To inform my audience of the negative effects by becoming too dependent on technology. Central Idea: By becoming too dependent on technology will give negative effects to our education, behavior and economic. Introduction– According to study conducted by a company called McCan Worldgroup, young people are obsessed with their technology until the point that they would rather lose one of their most important sense than to lose Facebook, the internet and their cell phones. â€Å"To them, losing the ability to explore and communicate via technology would be like a blind man losing his stick†. According to Oxford dictionary, technology means machinery or equipment developed from scientific knowledge. Do you realized how much we depend on technology?

How Did The History Of Meroe Reflect Interaction With...

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Teamwork And Collaboration How It s Integrated Into...

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