Cascaded combination of cancelling co-channel interference and decoding of error-correcting codes for CDMA

In this paper, we propose and analyze a direct sequence spread spectrum multiaccess (DS/CDMA) receiver that employs an integrated filtering and decoding technique for cancellation of cochannel interference (CCI) in cascaded form. We consider channels that experience multipath returns which is one of the factors responsible for signal degradation in mobile communication systems. The idea behind the integrated filtering is that CCI can be more reliably estimated by exploiting coding. We investigate the BER performance of the proposed scheme by theoretical analysis. Both numerical and simulation results exhibit the significant improvement that can be attained by the proposed scheme compared to the conventional scheme