PERFORMANCE OF SELECTION DIVERSITY FOR DS CDMA COMMUNICATIONS OVER RAYLEIGH FADING CHANNELS/

An analytical model to evaluate the performance of selection diversity is presented. Results indicate that the conventional selection divers ity scheme, in which the branch with the largest signal-to-noise ratio (SNR) is chosen, does not accurately reflect the performance of the m ore commonly implemented selection systems, in which the largest signa l-plus-interference and noise (S+I) is chosen. Owing to the statistica l nature of the noise, S+I selection diversity performs better than co nventional selection diversity model.