An Adaptive Spread Spectrum Receiver for Multipath/Scatter Channels

Abstract

Transmitted signal spectrum spreading is used to enhance multipath diversity performance. An adaptive DPSK spread spectrum multiple access receiver structure is presented for which optimal demodulation is obtained in slowly time-varying complex Gaussian scatter/multipath channels under convergence of the adaptive algorithm. The receiver performs a cross-correlation function equalization of a multipath degraded spread spectrum signal using a Stochastic Approximation technique. A potential of coherenit maximal-ratio multipath combining performance can be obtained under general slowly varying channel conditions.