Interference Cancelation in Non-coherent CDMA Systems Using Parallel Iterative Algorithms

TL;DR

This paper proposes a modified PLMS-PPIC algorithm for non-coherent CDMA systems that estimates channel phases and interference cancelation weights simultaneously, improving performance in various channel conditions.

Contribution

A novel modification of the PLMS-PPIC algorithm that jointly estimates channel phases and cancelation weights in non-coherent CDMA systems.

Findings

Effective in balanced, unbalanced, and time-varying channels

Improves interference cancellation performance

Demonstrated through simulation examples

Abstract

Parallel least mean square-partial parallel interference cancelation (PLMS-PPIC) is a partial interference cancelation which employs adaptive multistage structure. In this algorithm the channel phases for all users are assumed to be known. Having only their quarters in (0,2\pi), a modified version of PLMS-PPIC is proposed in this paper to simultaneously estimate the channel phases and the cancelation weights. Simulation examples are given in the cases of balanced, unbalanced and time varying channels to show the performance of the modified PLMS-PPIC method.