Code Division Multiple Access (CDMA) phần 9 docx

... IML MOBK023-05 MOBK023-Buehrer.cls September 28, 2006 15:56 162 CODE DIVISION MULTIPLE ACCESS (CDMA) 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0 .9 1 10 - 3 10 - 2 10 - 1 10 0 Standard deviation of delay estimate ... 15:56 150 CODE DIVISION MULTIPLE ACCESS (CDMA) Mathematically, we can represent the bit decisions for an S-stage parallel cancellation scheme at any stage s as ˆ...

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... two-sector system (K = 10). 99 P1: IML/FFX P2: IML MOBK023-03 MOBK023-Buehrer.cls September 28, 2006 15:55 102 CODE DIVISION MULTIPLE ACCESS (CDMA) 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0 .9 1 0 0.5 1 1.5 2 AWGN ... 3.15 2 T pc = 1.25 ms in IS -95 and cdma2000 and half that length in UMTS. P1: IML/FFX P2: IML MOBK023-03 MOBK023-Buehrer.cls September 28, 2006 15:55 100 CODE DIVIS...

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... 64 2.8 Multiple Access Performance of Frequency-Hopped Code Division Multiple Access 67 2 .9 Summary 71 3. Cellular Code Division Multiple Access 73 3.1 Principles of Cellular Code Division Multiple ... Access Methods 19 1.3 Multiple Access with Spread Spectrum . . 21 1.4 Summary 22 2. Spread Spectrum Techniques for Code Division Multiple Access 23 2....

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... MOBK023-Buehrer.cls September 28, 2006 15:54 16 CODE DIVISION MULTIPLE ACCESS (CDMA) 1.2.1 ALOHA The most common contention-based methods are random access methods. The first random access method was developed by ... Techniques for Code Division Multiple Access In the previous chapter, we reviewed the basic concepts of multiuser communications and the multiple access...

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... MOBK023-Buehrer.cls September 28, 2006 15:54 34 CODE DIVISION MULTIPLE ACCESS (CDMA) The benefit of Gold codes is that a large number of these codes are available for a given length N while having ... 28, 2006 15:54 30 CODE DIVISION MULTIPLE ACCESS (CDMA) FIGURE 2.4: Comparison of original/despread signal and spread signal spectra for DS/SS with square pulses. 2.2.2 Mu...

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... considered that arise in the multiple cell scenario P1: IML/FFX P2: IML MOBK023-02 MOBK023-Buehrer.cls September 28, 2006 15:54 62 CODE DIVISION MULTIPLE ACCESS (CDMA) 0 2 4 6 8 10 12 14 16 18 ... MOBK023-Buehrer.cls September 28, 2006 15:54 56 CODE DIVISION MULTIPLE ACCESS (CDMA) - 15 - 10 - 5 0 5 10 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0 .9 1 Normalized received powe...

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... 28, 2006 15:55 82 CODE DIVISION MULTIPLE ACCESS (CDMA) 3.1.4 Statistical Multiplexing The final fundamental CDMA concept that we will discuss in this section is termed statistical multiplexing, which ... SPECTRUM TECHNIQUES FOR CODE DIVISION MULTIPLE ACCESS 71 This is in stark contrast to DS-CDMA, which is very sensitive to the near-far problem as seen in Figure 2. 29. 2 ....

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... MOBK023-Buehrer.cls September 28, 2006 15:55 114 CODE DIVISION MULTIPLE ACCESS (CDMA) Node 1 Node 2 Node 3 Node 4 Node 5 Node 6 Node 7 Common code Common code C o d e # 4 C o d e # 2 Primary collision Secondary collision FIGURE ... MOBK023-Buehrer.cls September 28, 2006 15:55 118 CODE DIVISION MULTIPLE ACCESS (CDMA) indicator of the success or failure of packet...

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... in Figure 5.5 [99 ]. In this method, all users are again ordered in P1: IML/FFX P2: IML MOBK023-05 MOBK023-Buehrer.cls September 28, 2006 15:56 132 CODE DIVISION MULTIPLE ACCESS (CDMA) CDMA receivers Single user Multiuser Matched filter Adaptive filters Optimal (MLSE) Sub-optimal Linear ... 15:56 146 CODE DIVISION MULTIPLE ACCESS (CDMA) where p = [P 1 , P 2 , P K ] and...

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... Communications, vol. 25, pp. 795 – 799 , August 197 7.doi:10.11 09/ TCOM. 197 7.1 093 915 P1: IML/FFX P2: IML MOBK023-05 MOBK023-Buehrer.cls September 28, 2006 15:56 166 CODE DIVISION MULTIPLE ACCESS (CDMA) where Z k,l,i,n is ... Communications, vol. 41, pp. 285– 290 , February 199 3.doi:10.11 09/ 26.216 499 [98 ] A. Duel-Hallen, “On suboptimal detection for asynchronous code-...

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