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Performance of Multiuser-Coded CDMA Systems With Transmit Diversity Over Nakagami- m Fading Channels

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2 Author(s)

The performance of a multiple-input-multiple-output (MIMO) code-division multiple-access (CDMA) system, using space-time spreading (STS), is analyzed over a frequency-flat Nakagami-m fading channel. The convolutionally space-time coded system employs a decorrelator detector with N = 2 and L antennas at the user side and base station (BS), respectively. Assuming independent Nakagami fading channels between transmit and receive antennas, we determine the probability density function (pdf) of the signal-to-interference-plus-noise ratio (SINR) at the output of the multiuser detector and after signal combining. Considering binary phase-shift keying (BPSK) transmission, we then evaluate the pairwise error probability and the corresponding bit-error-rate (BER) upper bounds over fast-fading channels. The derived error bounds, when compared to system simulations, are shown to be accurate at all signal-to-noise ratios (SNRs) of interest. Examining the asymptotic performance of the underlying space-time multiuser system, at high SNRs, we evaluate the overall diversity gain as a function of the number of transmit and receive antennas and the minimum free distance of the convolutional code.

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Vehicular Technology, IEEE Transactions on  (Volume:58 ,  Issue: 5 )