Novel space-time processing of DS/CDMA multipath signal

This paper proposes a novel space-time receiver structure that jointly combines all possible diversities to combat multipath-induced interchip interference (ICI) and multiusers-induced cochannel interference (CCI or MAI). The proposed structure converts the design of a 2D RAKE receiver into the deconvolution filtering or space-time beamforming framework. The linear complexity detection algorithm is both computationally and conceptually feasible. The effect of pointing error (estimation error of the channel parameters) on the system's performance is also extensively studied. Moreover, we propose an adaptive robust beamforming technique to improve the system performance that is severely degraded in the presence of pointing error. Simulation results shows that the proposed algorithm can effectively improve the system performance to approach the ideal case (without pointing error).