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Optimizing Power Allocation in a Cellular DS/FFH-CDMA System under Rayleigh Fading

The optimization between the average received power and the theoretically achievable average channel capacity per user (in the Shannon sense) of a hybrid directsequence/ fast frequency hopping code-division multiple-access (DS/FFHCDMA) cellular system, when operating in a Rayleigh fading environment, is examined. The theoretical analysis leads to a novel-closed form expression for the optimal average received power value based on the maximization of the achieved spectral efficiency, estimated in terms of the available average channel capacity per user. Finally, respective numerical results are presented, which will be useful for the initial practical design of a DS/FFH-CDMA cellular system when operating in a Rayleigh fading environment.