Blind equalization of CDMA systems with nonlinear channels

Code division multiple access (CDMA) has emerged as a popular format for many multiuser communication systems. However, the error performance of CDMA systems deteriorates as a result of intersymbol interference and nonlinearities. We propose a blind equalizer for chip synchronous CDMA systems with Volterra (nonlinear) channels. The equalizer requires multiple observations at the receiver, obtained through oversampling or multiple antennas, and a knowledge of the code for the desired user. Zero forcing equalization is possible in the noise-free case. Simulations demonstrate the performance of the equalizer on a number of different channel and user configurations.