tailieunhanh - Báo cáo hóa học: " Research Article A Chip-Level BSOR-Based Linear GSIC Multiuser Detector for Long-Code CDMA Systems"

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 Chip-Level BSOR-Based Linear GSIC Multiuser Detector for Long-Code CDMA Systems | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2007 Article ID 25945 9 pages doi 2007 25945 Research Article A Chip-Level BSOR-Based Linear GSIC Multiuser Detector for Long-Code CDMA Systems A. Bentrcia 1 A. Zerguine 1 and M. Benyoucef2 1 Electrical Engineering Department KingFahd University of Petroleum and Minerals 1387 Dhahran 31261 Saudi Arabia 2 Department of Electronics Faculty of Engineering University ofBatna Batna 05000 Algeria Received 7 March 2007 Revised 7 August 2007 Accepted 10 October 2007 Recommended by Chia-Chin Chong We introduce a chip-level linear group-wise successive interference cancellation GSIC multiuser structure that is asymptotically equivalent to block successive over-relaxation BSOR iteration which is known to outperform the conventional block Gauss-Seidel iteration by an order of magnitude in terms of convergence speed. The main advantage of the proposed scheme is that it uses directly the spreading codes instead of the cross-correlation matrix and thus does not require the calculation of the crosscorrelation matrix requires 2NK2 floating point operations flops where N is the processing gain and K is the number of users which reduces significantly the overall computational complexity. Thus it is suitable for long-code CDMA systems such as IS-95 and UMTS where the cross-correlation matrix is changing every symbol. We study the convergence behavior of the proposed scheme using two approaches and prove that it converges to the decorrelator detector if the over-relaxation factor is in the interval 0 2 . Simulation results are in excellent agreement with theory. Copyright 2007 A. Bentrcia et al. 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 Actual cellular systems such as IS-95 and UMTS are .

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