Using signal cancellation for optimum beamforming in a cellular CDMA system

We propose a new algorithm for estimating the interference-plus-noise covariance matrix for beamforming in a cellular CDMA system in a fading channel. The method uses direct PN sequence signal cancellation. We show in theory that our method outperforms that of [1,2] for finite input data. The results, confirmed by simulation, show that we get improved DOA estimates and SINR with lower computational requirements.