Semi-blind MMSE algorithm for adaptive antennas in OFDM/CDMA systems

This paper presents a semi-blind minimum mean square error (MMSE) beamforming adaptive algorithm used for OFDM/CDMA combined system. The proposed algorithm exploits the transmitting pilot signal in the initial period of the transmission to update the weight vector. Then it applies the blind adaptive period to update the weight vector, in which the pilot signal is no longer used. The derivation of the algorithm based on the mean square error (MSE) criterion is also presented. Computer simulation is carried out to verify the performance of the proposed approach.