A novel adaptive beamforming algorithm for antenna array CDMA systems with strong interferers

Blind beamforming based on the maximum signal-to-noise ratio (MSNR) can improve the performance of the array system only when the processing gain of the given code-division multiple-access (CDMA) system is high enough such that the desired signal can become dominant after the despreading [3], [15]. In this paper, we consider a maximum signal-to-(interference plus noise) ratio (MSINR) beamforming. The MSINR performance criterion is chosen to effectively deal with strong interferers. It is shown in this paper that a blind MSINR beamforming is possible by directly utilizing input and output signals of correlators of the CDMA systems. In addition, we propose an adaptive beamforming algorithm at a lower computational complexity—about (7 5 )—where is the number of antenna elements of the array system. Simulation results are presented in various signal environments to show the performance of the proposed adaptive algorithm.