Wireless Communications over MIMO Channels phần 6 pptx

... presents some information on the theoretical results of CDMA systems. Wireless Communications over MIMO Channels Vo l k e r K ¨ uhn  20 06 John Wiley & Sons, Ltd CODE DIVISION MULTIPLE ACCESS 201 OFDM transmitter OFDM receiver despreading spreading S/P P/S channel Figure ... 1]. (4.9) 166 FORWARD ERROR CORRECTION CODING r 1 r 2 r 3 r 4 r 5 r 6 s 1 s 2 s 3 P V Figure 3.52 Bi...

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... addressed in Section 3 .6. Section 3.5 discusses the performance of codes by different means. The distance properties of codes are examined and used for Wireless Communications over MIMO Channels Vo l ... the number of correctable error patterns. For r = 2, 3, 4, 5, 6, 7, , the binary (n, k) Ham- ming codes (3,1), (7,4), (15,11), (31, 26) , (63 ,57), and (127,120) exist. As an exam...

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... limited to the physical transmission Wireless Communications over MIMO Channels Vo l k e r K ¨ uhn  20 06 John Wiley & Sons, Ltd Wireless Communications over MIMO Channels xxiv LIST OF SYMBOLS s[k, ... Low-DensityParityCheck(LDPC)Codes 160 3.7.1 BasicDefinitionsandEncoding 160 3.7.2 GraphicalDescription 165 3.7.3 DecodingofLDPCCodes 167 3.7.4 PerformanceofLDPCCo...

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... DIGITAL COMMUNICATIONS 0 10 20 30 40 10 6 10 −5 10 −4 10 −3 10 −2 10 −1 10 0 E b /N 0 in dB → P s → M = 4 M = 16 M = 64 Figure 1.20 Symbol error probabilities for M-QAM and transmission over an ... 100 Figure 1. 26 Probability density functions of normalized γ [k] for different diversity degrees D and i.i.d. diversity channels 16 INTRODUCTION TO DIGITAL COMMUNICATIONS 0 1 2 3 4...

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... (2.81) INFORMATION THEORY 67 0 10 20 30 2 3 4 5 6 0 5 10 15 20 2 3 4 5 6 E s /N 0 in dB → E b /N 0 in dB → ¯ I (X ;Y) → ¯ I (X ;Y) → GaussianGaussian 16- QAM 16- QAM 64 -QAM64-QAM a) mutual information ... 4 6 8 0 0.2 0.4 0 .6 0.8 1 0 2 4 6 8 0 0.2 0.4 0 .6 0.8 1 a) PDF of max. SNR b) CDF of max. SNR single single N u = 4 N u = 4 N u = 6 N u = 6 N u = 8 N u = 8 N u = 10 N u...

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... is also possible (Costello et al. 2000). 160 FORWARD ERROR CORRECTION CODING 0 0.2 0.4 0 .6 0.8 1 0 0.2 0.4 0 .6 0.8 1 0 0.2 0.4 0 .6 0.8 1 0 0.2 0.4 0 .6 0.8 1 ¯ I (2) a = ¯ I (1) e → ¯ I (2) a = ¯ I (1) e → ¯ I (2) e = ¯ I (1) a → ¯ I (2) e = ¯ I (1) a → a) ... C d being much smaller than one. FORWARD ERROR CORRECTION CODING 161 0 0.2 0.4 0 .6 0.8 1 0 0.2 0.4 0 .6 0.8 1 0 0.2 0.4 0...

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... R wh c = 4/ 16 R rc c = 1/8 SCCW 2 g 1 = 7 8 , g 2 = 5 8 Walsh, R wh c = 6/ 64 R rc c = 1/3 SCCW 3 g 1 = 7 8 , g 2 = 5 8 Walsh, R wh c = 8/2 56 - SCCW 4 g 1 = 23 8 , g 2 = 55 8 Walsh, R wh c = 6/ 64 R rc c = ... will 0 1 2 3 4 5 6 10 6 10 −5 10 −4 10 −3 10 −2 10 −1 10 0 0 1 2 3 4 5 6 10 6 10 −5 10 −4 10 −3 10 −2 10 −1 10 0 E b /N 0 in dB →E b /N 0 in dB → BER → BER → a) L π = 60...

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... obtain  y  y   =  S  −S  S  S   ·  a  a   +  n  n   . (5 .65 ) Since a  = 0 for real modulation schemes, a  = a holds and (5 .65 ) reduces to  y  y   =  S  S   · a  +  n  n   = S r · a + n r . (5 .66 ) From (5 .66 ), we see that ... (Golub and van Loan 19 96) of R = L H L with the lower triangular matrix L, results in r = L H La + S H n ⇒ ˜ r = La + L...

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... =  I L a 0 L a ×N T −L a  (6. 65) and the output signal ˜ a can be described by ˜ a = U H X ·  Hx + n  = U H X U ·  · V H V X ·  1/2 X · a + U H · n =  0 ·  1/2 X · a + ˜ n. (6. 66) Since the matrices ... diagonal, (6. 66) describes a set of decoupled scalar equations, and no interference disturbs the transmission. The νth symbol can be detected from ˜a ν = σ ν ·  λ ν · a ν +˜n ν ....

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... spread θ µ . INDEX 361 girth, 165 node, 165 Tanner graph, 166 vertex, 165 Gray mapping, 28 Guard interval, 3, 197 Hadamard code, 99, 192 Hadamard matrix, 99 Hamming bound, 96 code, 98 distance, ... 34 BLAST, 307 BLAST detection, 258 BSC, 67 Capacity region, 78 Carrier frequency, 9 Wireless Communications over MIMO Channels Vo l k e r K ¨ uhn  20 06 John Wiley & Sons,...

Ngày tải lên: 14/08/2014, 12:20