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Báo cáo hóa học: " Research Article Adaptive Channel-Tracking Method and Equalization for MC-CDMA Systems over Rapidly Fading Channel under Colored Noise"

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: IResearch Article Adaptive Channel-Tracking Method and Equalization for MC-CDMA Systems over Rapidly Fading Channel under Colored Noise | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2010 Article ID 871650 12 pages doi 10.1155 2010 871650 Research Article Adaptive Channel-Tracking Method and Equalization for MC-CDMA Systems over Rapidly Fading Channel under Colored Noise Chang-Yi Yang1 and Bor-Sen Chen2 1 Department of Computer Science and Information Engineering National Penghu University Penghu 88046 Taiwan 2 Department of Electrical Engineering National Tsing-Hua University Hsin-chu 300 Taiwan Correspondence should be addressed to Chang-Yi Yang cyyang@npu.edu.tw Received 22 October 2009 Revised 30 June 2010 Accepted 13 July 2010 Academic Editor Cihan Tepedelenlioglu Copyright 2010 C.-Y. Yang and B.-S. Chen. 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. A recursive maximum-likelihood RML algorithm for channel estimation under rapidly fading channel and colored noise in a multicarrier code-division multiple-access MC-CDMA system is proposed in this paper. A moving-average model with exogenous input MAX is given to describe the transmission channel and colored noise. Based on the pseudoregression method the proposed RML algorithm can simultaneously estimate the parameters of channel and colored noise. Following the estimation results these parameters can be used to enhance the minimum mean-square error MMSE equalizer. Considering high-speed mobile stations a one-step linear trend predictor is added to improve symbol detection. Simulation results indicate that the proposed RML estimator can track the channel more precisely than the conventional estimator. Meanwhile the performance of the proposed enhanced MMSE equalizer is robust to the rapidly Rayleigh fading channel under colored noise in the MC-CDMA systems. 1. Introduction The direct-sequence code-division multiple-access DS-CDMA technique has