Performance of iterative CDMA receivers with channel estimation in multipath environments

Abstract

Most works published on iterative CDMA receivers assume perfect channel knowledge or very simple channel models like the flat-fading channel. We want to extend the scope to multipath propagation scenarios and suggest an iterative scheme with channel estimation in the uplink of a chip-synchronous CDMA system. Channel estimates rely on pilot symbols and a posteriori probabilities on code bits from a SISO decoder. The multiuser detector is implemented as a parallel interference canceler with post-MMSE filtering. We present simulation results of the performance in different multipath scenarios, including real channel sounder measurements.