MIMO array DS-CDMA system: a blind space-time-Doppler estimation/reception

A blind near-far resistant MIMO array receiver is proposed for time-varying asynchronous multipath DS-CDMA systems. Unlike many other MIMO works, the proposed receiver is built on array-antenna technology which is commonly used in applications such as the well-known ´smart antenna´ system. Hence, a novel space-time-Doppler estimation algorithm is devised which provides the joint angle and delay, as well as the Doppler shift frequency estimation. With the estimator integrated as the front-end, the proposed MIMO array receiver requires no knowledge of the channel and is insusceptible to near-far problems. Furthermore it is robust to channel estimation errors in the event of any unidentified or erroneous channel parameter.