ANALYSIS OF DECORRELATING DECISION-FEEDBACK MULTIUSER DETECTORS FOR CDMA SYSTEMS

Several multiuser detectors have been recently proposed to combat mult iple-access interference and near-far problem for CDMA systems. The pe rformance of a multi-user receiver in combining the decorrelating deci sion-feedback scheme for a synchronous DS/CDMA system is considered. U sing the Gaussian approximation on the multiple-access interference an d amplitude estimation errors, we derive a closed form expression for the BER performance of the decorrelating decision-feedback detector in single-path Rayleigh fading channel and power controlled system. And, we show that our analysis agrees with the results of simulations. A m odified decision-feedback detector is also proposed and analyzed. Nume rical results show that the modified decision-feedback detector propos ed in this paper results in enhanced performance.