Theory and applications of ofdm and cdma wideband wireless communications phần 2 ppt

... gain | c(t) | 2 of the channel can be calculated as | c(t) | 2 = a 2 1 + a 2 2 + 2a 1 a 2 cos ( 2 ( ν 1 − ν 2 ) t +θ 1 − θ 2 ) . Figure 2. 4 shows | c(t) | 2 for a 1 = 0.75 and a 2 = √ 7/4. The ... gain | H(f) | 2 of the channel can be calculated as | H(f) | 2 = a 2 1 + a 2 2 + 2a 1 a 2 cos ( 2 f ( τ 1 − τ 2 ) + θ 2 − θ 1 ) . The picture is similar to...

Ngày tải lên: 09/08/2014, 19:22

... → ˆ x) = 1  2 σ 2 /d 2  ∞ 0 dt e − d 2 t 2 2σ 2  t 0 da 2ae −a 2 . The second integral is 1 − e −t 2 so that P(x → ˆ x) = 1  2 σ 2 /d 2  ∞ 0  e − d 2 t 2 2σ 2 − e − d 2 +2 2 2σ 2 t 2  dt, which ... is often convenient to work with code words of finite length, but it is not necessary, and the length is not determined by the code. Theory and Ap...

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... the elements 0, 1, 2, 3, 4, 5, 6 is defined by the addition table + 123 456 1 23 4560 2 345601 3 4560 12 4 560 123 5 60 123 4 6 0 123 45 and the multiplication table 123 456 24 6135 3 625 14 41 526 3 5316 42 654 321 Note ... channel and parallelize the given data stream in an appropriate way. Theory and Applications of OFDM and CDMA Henrik Schulze and Christian L...

Ngày tải lên: 09/08/2014, 19:22

... (1.17) Theory and Applications of OFDM and CDMA Wideband Wireless Communications Henrik Schulze and Christian L ¨ uders Both of Fachhochschule S¨udwestfalen Meschede, Germany x PREFACE and modulation. ... is,  x  2 =  ˜x  2 and  y  2 =  ˜y  2 . 2 BASICS OF DIGITAL COMMUNICATIONS and b k =− 2 T  T 0 sin  2 k T t  x(t) dt. (1.3) These c...

Ngày tải lên: 09/08/2014, 19:22

... 0,f ,2 f , 3f . Here f = 1/T is the OFDM carrier spacing, and 1 72 OFDM –4 2 0 2 4 –4 2 0 2 4 I(a) (b) –4 2 0 2 4 I –4 2 0 2 4 I –4 2 0 2 4 I –4 2 0 2 4 I –4 2 0 2 4 I Q –4 2 0 2 4 Q –4 2 0 2 4 Q –4 2 0 2 4 Q IBO ... speed and ν max = v c f 0 OFDM 167 0 0.5 1 1.5 2 2.5 3 3.5 4 2 0 (a) (b) (c) 2 t/T S 0 0.5 1 1.5 2 2.5 3 3.5 4 t/T S 0 0.5...

Ngày tải lên: 09/08/2014, 19:22

... have E ID   R K   2 α 2  = 3 4 R K  δ 2 α 2  + 1 4 R K  9δ 2 α 2  (4. 32) for the ID case and E EX   R K   2 α 2  = 3 4 R K  δ 2 α 2  + 1 4 R K  4δ 2 α 2  (4.33) OFDM 21 3 0 2 4 6 8 10 12 14 16 10 −4 10 −3 10 2 10 −1 10 0 SNR ... an OFDM system may be called a wideband system relative to the channel parameters only 21 2 OFDM 0 2...

Ngày tải lên: 09/08/2014, 19:22

... pa- rameters for OFDM, modulation and channel coding. The corresponding IEEE 8 02. 11a standard (IEEE 8 02. 11a 1999) and HIPERLAN /2 standard (EN101475 20 01) were released in 1999 and 20 00, respectively. The ... also L-dimensional complex AWGN with variance σ 2 = N 0 in each dimension. OFDM 25 9 Table 4.9 The OFDM Parameters for HIPERLAN /2 and IEEE 8 02. 11a KT T S ...

Ngày tải lên: 09/08/2014, 19:22

... if     c ∗ 1 c 2 ρ 12    < | c 1 | 2 (5 .27 ) r r 1 00 10 0111 Threshold 1 c 2 g 2 c 1 g 1 Threshold 2 Figure 5 .27 Two-user BPSK SUMF receiver for unequal fading amplitudes and ρ 12 = 0.6. CDMA 29 3 Reducing the ... log    s∈S 0 exp  1 σ 2    s † C † v  − 1 2 s † Ks    s∈S 1 exp  1 σ 2    s † C † v  − 1 2 s † Ks     . (5.40) 328 CDMA...

Ngày tải lên: 09/08/2014, 19:22

... is psc 1 ssc 1,1 ssc 1 ,2 ssc 1,14 ssc 1,15 psc 2 ssc 2, 1 ssc 2, 2 ssc 2, 14 ssc 2, 15 psc 8 ssc 8,1 ssc 8 ,2 ssc 8,14 ssc 8,15 psc 5 12 ssc 5 12, 1 ssc 5 12, 2 ssc 5 12, 14 ssc 5 12, 15 psc 505 ssc 505,1 ssc 505 ,2 ssc 505,14 ssc 505,15 Scrambling ... expressions are µ l = { s l 2 ( v l 2 − s l−1 ρ 12 [0] − s l ρ 11 [1] ) } for odd values of l and µ l = { s l 2 (...

Ngày tải lên: 09/08/2014, 19:22

... 10 pulse, 9 OFDM, 1, 145 OFDM and nonlinearities, 166 symbol, 159 OFDM with convolutional coding, 20 8, 21 3 OFDM with QAM, 21 3 OFDM with QPSK, 20 8 Omni cell, 27 0 Open-loop power control, 28 6, 374, ... 51 Doppler spectrum, 57 Downlink, 26 9 DPCCH, 367 DPDCH, 367 DPSK, 44 DQPSK, 25 0 DS -CDMA, 306, 3 62 DTX, 29 3 DVB, 20 8, 20 9, 25 1 DVB-C, 25 2 DVB-S, 25 2 DVB-T...

Ngày tải lên: 09/08/2014, 19:22