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By Savo G Glisic

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The multicarrier DS-CDMA transmitter spreads the S/P-converted data streams using a given spreading code in the time domain so that the resulting spectrum of each subcarrier can satisfy the orthogonality condition with the minimum frequency separation. This scheme is originally proposed for an uplink communication channel, because the introduction of OFDM signaling into the DS-CDMA scheme is effective for the establishment of a quasisynchronous channel. 15 shows the multicarrier DS-CDMA transmitter of the jth user and the power spectrum of the transmitted signal, respectively, where G MD denotes the processing gain, NC j j j the number of subcarriers, and C j (t) = [C1 C2 · · · C G MD ] the spreading code of the jth user.

5. (511, 502,1) (127. 6 Performance of different BCH and Hamming codes. Each code is identified with three numbers: the block length n, the number of information bits k, and the number of corrected errors t. For a Hamming code and available signal to noise ratio in the range E b /N0 = 9–10 dB, we can increase the data rate Rs /W approximately by a factor of two if we reconfigure the code from H(7, 4, 1) to H(511, 502, 1). 7 Cutoff rate-based bounds on the required signal to noise ratio as a function of the code rate Rc for hard and soft decisions and binary antipodal modulation over the AWGN channel.

However, if the number of users is large and no such multiuser detector is feasible, then it is reasonable to approximate the combined effect of the other users’ dehopped interfering signals as a Gaussian random process. All details regarding the system performance will be discussed in Chapter 8. 2 Adaptive Coding Channel coding is a well established technical field that includes both strong theory and a variety of practical applications. Both theory and practice are well documented in open literature.

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