Code Division Multiple Access (CDMA) phần 7 pps

... 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 ... common code, Node 2 is transmitting on Code 2, Node 4 is transmitting on Code 4, and Node 7 is transmitting on the common code. Node...

Ngày tải lên: 07/08/2014, 21:20

... 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 ... 22 2. Spread Spectrum Techniques for Code Division Multiple Access 23 2.1 Forms of Code Division Multiple Access 23 2.2 Direct Sequence Code Di...

Ngày tải lên: 07/08/2014, 21:20

... 2006 15:54 10 CODE DIVISION MULTIPLE ACCESS (CDMA) 1 3 5 4 5 4 7 2 6 6 3 5 7 3 4 2 6 7 2 1 1 1 1 1 1 7 6 5 2 3 4 6 5 7 FIGURE 1.4: Classic frequency reuse for a reuse pattern of 7. of hexagons ... 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 meth...

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... SPECTRUM TECHNIQUES FOR CODE DIVISION MULTIPLE ACCESS 33 TABLE 2.1: Code length N and the number of m-sequences N p (n). nN= 2 n − 1 N p (n) 231 372 415 2 531 6 663 6 7 1 27 18 8 255 16 9 511 48 10 ... 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...

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... MOBK023-Buehrer.cls September 28, 2006 15:54 SPREAD SPECTRUM TECHNIQUES FOR CODE DIVISION MULTIPLE ACCESS 57 0 5 10 15 10 - 7 10 - 6 10 - 5 10 - 4 10 - 3 10 - 2 10 - 1 10 0 Probability of error E b / N 0 ... into (2 .77 ) and subsequently into (2 .70 ) leads to E   I j,k  2  = T c 2 P j 2 E[cos 2 (φ j )]E[W 2 j ] (2 .78 a) = T c 2 P j 4  3N −2((N −1)/2) − 1 3  (2 .78 b) = T...

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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 ... 2006 15:54 72 P1: IML/FFX P2: IML MOBK023-03 MOBK023-Buehrer.cls September 28, 2006 15:55 CELLULAR CODE DIVISION MULTIPLE ACCESS 79 Comparing this to TDMA or FDMA, K td...

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... 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 channel 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 Transmit ... IML/FFX P2: IML MOBK023-03 MOBK023-Buehrer.cls September 28, 2006 15:55 CELLULAR CODE DIVISION MULTIPLE ACCESS 97 Once we have determined the joint probability matrix, th...

Ngày tải lên: 07/08/2014, 21:20

... regarding the decorrelator in fading chan- nels [64 71 ], temporal dispersion [72 , 73 ], asynchronism [74 76 ], adaptive [77 , 78 ] and re- duced complexity [79 –82]. Other variants of the decorrelating detector ... with FER-based power control [103, 106, 1 07] . P1: IML/FFX P2: IML MOBK023-05 MOBK023-Buehrer.cls September 28, 2006 15:56 142 CODE DIVISION MULTIPLE ACCESS (CDMA)...

Ngày tải lên: 07/08/2014, 21:20

... 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 ... ρb 2 − ρsgn(b 2 + ρb 1 + n 2 ) + n 1  (5 .75 ) P1: IML/FFX P2: IML MOBK023-05 MOBK023-Buehrer.cls September 28, 2006 15:56 160 CODE DIVISION MULTIPLE ACCESS (CDMA) desir...

Ngày tải lên: 07/08/2014, 21:20

... Communications, vol. 25, pp. 79 5 79 9, August 1 977 .doi:10.1109/TCOM.1 977 .1093915 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 ... 2006 17: 14 176 CODE DIVISION MULTIPLE ACCESS (CDMA) [43] M. B. Pursley, “The role of spread spectrum in packet radio networks,” Proceedings of...

Ngày tải lên: 07/08/2014, 21:20