Performance improvement of MC-CDMA receiver at base station in fading channel using blind adaptive beamforming

In this paper, we propose an alternative approach for adaptive beamforming in multicarrier code-division multiple-access (MC-CDMA) receiver at base station. This adaptive beamforming algorithm called blind despread-respread technique (blind-DRT) algorithm does not require direction of arrival estimation and training signal. It uses despread-respread technique with the normalized least mean square (NLMS) adaptive algorithm for MC-CDMA system. Computer simulations show that the blind-DRT algorithm can reduce interference from other users and has BER performance better than both the MC-LMS adaptive beamforming algorithm and the MC-CDMA receiver without using adaptive antenna array in the perfect power control and near-far effect environment.