Effect of signal quantization on the performance of LMMSE receiver in WLL channels

This paper examines the effect of signal quantization on the performance of an adaptive LMMSE DS-CDMA receiver in the up-link of low mobility, high data rate wireless local loop (WLL) application. The baseband receiver considered is the LMS-LMMSE receiver which includes the finite quantization of the incoming signal. Both AWGN channel and multipath channel models based on actual channel measurements are used in the computer simulations. Also the effect of imperfect power control on the signal quantization is considered. It is shown that the degradation in the performance of the receiver is relatively insignificant with practical levels of quantization.