tailieunhanh - Báo cáo hóa học: " Research Article A Joint Optimization Criterion for Blind DS-CDMA Detection"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article A Joint Optimization Criterion for Blind DS-CDMA Detection | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2007 Article ID 79248 11 pages doi 2007 79248 Research Article A Joint Optimization Criterion for Blind DS-CDMA Detection Ivan Duran-Diaz and Sergio A. Cruces-Alvarez Departamento de Teoria de la Senal y Comunicaciones Escuela Tecnica Superior de Ingenieros Universidad de Sevilla Camino de los Descubrimientos s n 41092 Sevilla Spain Received 30 September 2005 Revised 9 May 2006 Accepted 11 June 2006 Recommended by Frank Ehlers 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. Copyright 2007 I. Duran-Diaz and S. A. Cruces-Alvarez. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. INTRODUCTION Direct-sequence code-division multiple access DS-CDMA is a common technique in mobile communications that complements other preexisting access techniques such as TDMA or FDMA 1-7 . In systems that use CDMA users share the same band of frequencies and the same time slots. So the signal that arrives at the receiver is a superposition in time and frequency of contributions from different users. Since

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