ANALYSIS OF DS-CDMA PARALLEL INTERFERENCE CANCELLATION WITH PHASE ANDTIMING ERRORS

We consider the use of multistage parallel interference cancellation a t the base station of a code-division multiple-access (CDMA) wireless system. Previous work in this area has demonstrated the potential for significant improvements in capacity and near-far resistance. However, most previous work has assumed perfect synchronization with the signa ls of interest. Practical systems will experience phase jitter and tim ing errors. We undertake an analysis of the effects of phase and timin g errors, obtaining a closed form result for bit-error rate (BER) perf ormance after an arbitrary number of stages of cancellation in an addi tive white Gaussian noise (AWGN) channel. This result is shown to agre e well with simulations. Simulation results are also presented for the important case of frequency selective Rayleigh fading. The results fr om both analysis and simulations demonstrate that interference cancell ation is fairly robust to phase and timing errors.