Multi-user receiver using conjugate gradient method for wideband CDMA

Abstract

The paper describes a new scheme for a multi-user receiver to improve the capacity of wideband CDMA systems. The scheme is obtained by applying a conjugate gradient method (CGM) based on a mathematical approach. CGM gives an iterative solution of a large-scale matrix under multiple access interference environments. The relation between the transmitted and received signals is represented by a sparse matrix, which has diagonal components almost equal to one and other components approaching 0. This matrix equation is expected to be solved effectively by using CGM. The proposed scheme has been shown to have three times enhancement in capacity compared to single user receiver.