Blind Multiuser Receiver in Rayleigh Fading Channel

We propose and investigate a code-division multiple-access (CDMA) communication system using independent component analysis (ICA) for blind signal detection purposes. The proposed blind ICA based CDMA systems employ short spreading sequences in the presence of Rayleigh fading channels. This approach is capable of countering the presence of multiple access interference (MAI) in CDMA fading channels. The aim of the blind system is to include the ICA algorithm within a wireless receiver in order to reduce the level of multiuser interference in communication systems. Unlike the conventional MMSE receiver, the proposed ICA blind multiuser detector is made robust with no-training sequences and perfect knowledge of signature waveforms. It has achieved nearly the same performance of the conventional training based MMSE receiver. Several comparisons and experiments are performed based on examining bit error rate (BER) performance in AWGN and Rayleigh fading channels in order to verify the validity of the proposed blind ICA multiuser detector