TIME DIVISION MULTIPLE ACCESS TECHNIQUES PPT

frequency hopping technique uses frequency diversity. Of course, the hopping sequences2 The Mobile Radio Channel and the Cellular Principle16Figure 2.7: TDMA channels on multiple carrier frequenciesFigure 2.8: TDMA with use of frequency hopping techniquemust be orthogonal, i.e. one must ascer[r]

transmitters at different locations.Aim to share a channel between two or more signals in such way that each signal can be received without interference from another. Wireless Access Tech. Lab.CCU Wireless Access Tech. Lab.Introduction (2) Wireless Access Tech. Lab.CCU Wireless[r]

FDMAFDMAEach user is assigned aslice of the RF spectrumApplicationsAnalog Cellular AMPS NMT TACSAnalog PMRAnalog SatellitesBandwidth Divis ion into FrequenciesAll rights reserved © 2000, Alcatel, Paris.Location, Date, page n° 10 Time Division Multiple AccessTDMAPowerPowe[r]

The objective of this book is to provide the reader with a concise introduction to the useof spread spectrum waveforms in multiple user systems, often termed code division multipleaccess or CDMA. The book has been an outgrowth of course notes presented in a graduate-level course on spr[r]

expensive if a wired solution is present. Further, the operation of FWA networks gen-erally require the acquirement of two licenses, one enabling the offer of telecommunica-tion services and the other the use of the radio spectrum. The allocation of radio spectrumis also a problem. To be able to off[r]

you some time in determining where to place APs and clients.09_1587202115_ch08.qxd 9/29/08 2:39 PM Page 140Chapter 8: Additional Wireless Technologies 141Exam Preparation TasksReview All the Key TopicsReview the most important topics from this chapter, denoted with the Key Topic icon.Table 8-[r]

in the context of a two-user multiple access channel and thenextended in a number of recent works to other scenarios (see,e.g., [11, 12] and references therein). Moreover, the topologyof a cellular system is abstracted according to the linearversion of the model introduced in [3](see[6[r]

the available frequency band is split into two partial bands, to enable simultaneous sendingand receiving. One partial band is assigned as uplink (from mobile to base station) and theother partial band is assigned as downlink (from base to mobile station):² Uplink: transmission band of mobile statio[r]

7The Air-Interface of GSMThe Air-interface is the central interface of every mobile system and typicallythe only one to which a customer is exposed.The physical characteristics of the Air-interface are particularly importantfor the quality and success of a new mobile standard. For some mobile system[r]

ra nhận xét và đánh giá.Phương pháp nghiên cứu của đồ án là xây dựng lưu đồ thuật toán, tính toán môphỏng để minh họa bằng hình vẽ về các kĩ thuật phân tập so với công thức toán học.Đồ án đã mô phỏng được các kĩ thuật phân tập anten bằng Matlab đưa ra đượchình vẽ phù hợp với lý thuyết nghiên cứu.Đồ[r]

1The Generalized CDMA1.1 IntroductionOne of the basic concepts in communication is the idea of allowing several transmittersto send information simultaneously over a communication channel. This concept isdescribed by the terms multiple access and multiplexing.Thetermmultiple access<[r]

delayed. This re-modulation or correlation of the delayed spreading signal with thereceived signal is called despreading and is a critical function in all spread spectrumsystems.1.2CDMA system modelAs mentioned earlier, CDMA is an application of the direct-sequence spreadspectrum signal. The basic i[r]

GSM TDMA TRANG 13 FREQUENCY DIVISION MULTIPLE ACCESS FDMA _°_ American Mobile Phone System AMPS —Tổng băng tần 25 MHz TRANG 14 TIME DIVISION MULTIPLE ACCESS TDMA _°_ GSM —Khe thời gian: [r]

EDGE đợc đặt dới sự bảo trợ của cả Viện tiêu chuẩn viễn thông Châu Âu (ETSI:European Telecommunication Standard Institute) lẫn Tập đoàn thông tin vô tuyếnhoàn cầu (UWC: Universe Wireless Communication Consortium), hệ quả là EDGEtơng thích với cả GSM lẫn IS-136. Mục đích ban đầu của việc phát triển E[r]

truyền thông tinNhư vậy nếu kênh truyền dẫn có dung lượng làC(bit/s) dòng thông tin có tốc độ là r(bit/s) thì số người sử dụng tối đa của một kênh truyền TDMA lan = int(C/r)3/10/2007 Khoa Điện Tử Viễn ThôngTDMA(Time Division Multiple Access)32121nKhe thời giansố liệu ngư[r]

1The Generalized CDMA1.1 IntroductionOne of the basic concepts in communication is the idea of allowing several transmittersto send information simultaneously over a communication channel. This concept isdescribed by the terms multiple access and multiplexing.Thetermmultiple access<[r]

CHAPTER TENMultiple-Access Techniques10.1 INTRODUCTIONThree commonly used techniques for accommodating multiple users in wirelesscommunications are frequency division multiple access (FDMA), time divisionmultiple access (TDMA), and code[r]

Keeping the average transmission power constant, we show that the TOA accuracy of each user does not depend on its transmissionprobability, while being a nondecreasing function of the transmission probability of any other user. Therefore, a generalized,noncontinuous CDMA system with a probability co[r]

OFDM Orthogonal Frequency Division Multiplexing Ghép kênh phân chia theo tần số trực giao OFDMA Orthogonal Frequency Division Multiple Access Đa truy nhập phân chia theo tần số trực giao[r]

FIGURE 5.13: Performance degradation in near-far channels (AWGN, Eb/No= 5dB for desired userand spreading gain = 31)P1: IML/FFX P2: IMLMOBK023-05 MOBK023-Buehrer.cls September 28, 2006 15:56160 CODE DIVISION MULTIPLE ACCESS (CDMA)desired user to 30dB above the desired user for N[r]