“Fractional self-decorrelation” pre-processing to enhance the output SINR of single-user-type DS-CDMA detectors in blind space-time RAKE receivers for fading channels with delay spreads approaching a symbol´s duration

A new “fractional self-decorrelation” technique is herein proposed to enhance the multipath constructive summation capability and the interference rejection capability of single-user-type DS-CDMA detectors at maximum-SINR blind space-time RAKE receivers to tackle the near-far problem in wireless mobile communications. This technique can significantly decrease the error rate and can remove the near-far problem´s error floor at high SNR. Moreover, this “blind” space-time processing receiver architecture needs no prior knowledge nor explicit estimation of (1) the channel´s multipath arrival angle or arrival delay or power profile — the fading channel´s delay spread may be of arbitrary length, even as long as the symbol duration, (2) the receiver´s nominal or actual antenna array manifold, and (3) the other DS-CDMA users´ signature spreading codes.