Abstract
In this paper, the diversity combining techniques over a Nakagami-faded channel with a coherent direct-sequence code-division multiple-access (DS/CDMA) system are investigated. The performance of bit error rate (BER) is also compared between equal-gain combining (EGC) and maximal-ratio combining (MRC) for a Rake receiver. Numerical results indicate that complete MRC Rake receivers can be feasible for about 80% more user capacity and about 1.5dB improvement in system performance than EGC Rake receivers under exponential multipath intensity profile (MIP) conditions and the special case with a Rayleigh (m=1) fading channel. MRC has a higher rate of improvement than EGC when the number of combined branches increase. However, the performance of EGC reception may become superior to MRC while inaccurate or incomplete estimation in channel fading exists.
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