Optimization of partial parallel interference cancellation (PPIC) factor in CDMA systems

The paper introduces an optimized formula for the partial parallel interference cancellation (PPIC) factor in CDMA systems. This factor is introduced to decrease the biasing term, which appears in the brute force cancellation scheme, in which the cancellation is done totally. This operation degrades the system performance since the amplitude estimate in the early stages is not reliable, so in turn, the multiple access interference (MAI) estimate isn't reliable either, and the performance is degraded. We obtain a formula for PPIC bit error rate (BER) as a function of the PPIC factor F/sub k/, and derive a formula for an optimum F/sub k/ that minimizes BER. We introduce plots of BER to show the enhancement in BER when we use the optimum F/sub k/ at different system parameters.