Blind fully space-time RAKE DS-CDMA multiuser receiver based on min/max criterion with LC-RLS algorithms

A novel receiver structure of the space-time (ST) direct sequence code division multiple access (DS-CDMA) is proposed, in this paper, for multiple access interference (MAI) suppression under multipath fading channel. By using the Kronecker product an equivalent direct formulation of the fully ST RAKE DS-CDMA receiver, which integrates the information of spatial and temporal domains, is developed. With this formulation, a new blind fully space-time Rake multiuser detector based on the min/max criterion is devised, and implemented with the conventional linearly constrained least squares (LC-LS) and the sliding window LC-LS (SW-LC-LS) algorithms. Computer simulation results verify that the new proposed scheme could be used to effectively suppress the MAI and multipath, simultaneously, under the time varying Rayleigh fading channels. It outperforms the conventional space-time RAKE receiver with the imperfect channel estimation using pilot signal by the moving average approach.