EURASIP Journal on Advances in Signal Processing 
Volume 2007 (2007), Article ID 79248, 11 pages
doi:10.1155/2007/79248
Research Article

A Joint Optimization Criterion for Blind DS-CDMA Detection

Iván Durán-Díaz and Sergio A. Cruces-Alvarez

 Departamento de Teoría de la Señal y Comunicaciones, Escuela Técnica Superior de Ingenieros, Universidad de Sevilla, Camino de los Descubrimientos s/n, Sevilla 41092, Spain
Received 30 September 2005; Revised 9 May 2006; Accepted 11 June 2006

Recommended by Frank Ehlers

Abstract

This paper addresses the problem of the blind detection of a desired user in an asynchronous DS-CDMA communications system with multipath propagation channels. Starting from the inverse filter criterion introduced by Tugnait and Li in 2001, we propose to tackle the problem in the context of the blind signal extraction methods for ICA. In order to improve the performance of the detector, we present a criterion based on the joint optimization of several higher-order statistics of the outputs. An algorithm that optimizes the proposed criterion is described, and its improved performance and robustness with respect to the near-far problem are corroborated through simulations. Additionally, a simulation using measurements on a real software-radio platform at 5 GHz has also been performed.