Blind adaptive single user detection with adjustable step size for DS/CDMA communication over a Rayleigh fading mobile channel

An adaptive single user algorithm with adjustable step size has been proposed for use in DS/CDMA based communications. In addition, the adaptive step size algorithm has been incorporated into two multipath combiners in the forms of the RAKE receiver and the general sidelobe canceller architecture for use in a Rayleigh fading channel. The frame error rate results obtained by means of computer simulation illustrate the superior multiple access interference resistance of the proposed detectors compared to the conventional RAKE receiver. Furthermore, the results also reflect the enhanced convergence speed of the detectors and their ability to adjust the step sizes according to the rate of change of the received signal. Joint blind detection and blind channel parameter estimation and the robustness of the gradient adaptive step size constant modulus algorithm to imperfect channel estimation are the topics of future study by the authors.