A low complexity multi‐user detector based on G‐SIC and PIC for DS/CDMA systems

Abstract

Purpose

The purpose of this work is to propose a new multi‐user detector which cascades the linear G‐SIC with some linear PIC stages to form a new linear hybrid multi‐user detector.

Design/methodology/approach

Multistage interference cancellation multi‐user detectors became an increasingly important area of research due to their relative low computational complexity. The performance comparison of the proposed linear HIC is studied and presented using matlab environment to investigate the bit error rates. For DS/CDMA system, each user is characterized by its own code. The signals from users are spread by appropriately design sequences and then transmitted over an AWGN channel with BPSK modulation.

Findings

By the cascade of the linear G‐SIC and the traditional PIC, a low complexity multi‐user detector is found capable of reducing the long detection delay compared with the linear G‐SIC. The advantages of the linear G‐SIC and PIC can be exploited substantially.

Originality/value

The paper proposes an algorithm that can combat the MAI with less complexity, and also can speed the convergence compared with other detectors.

Citation

Yekhlef, M. and Saidi, L. (2012), "A low complexity multi‐user detector based on G‐SIC and PIC for DS/CDMA systems", COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, Vol. 31 No. 6, pp. 1815-1834. https://doi.org/10.1108/03321641211267137