Coded DS-CDMA systems with iterative channel estimation and no pilot symbols
Torrieri, Don J. Mukherjee, Amitav Kwon, Hyuck M.
Torrieri, Don J.
Mukherjee, Amitav
Kwon, Hyuck M.
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2010-07-12
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Article
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Keywords
Code-division Multiple Access (cdma), Channel, Estimation, Pilot Symbols, Expectation-maximization Algorithm, Iterative Receiver,Coded Ds-cdma Systems,Coherent Demodulation,Direct Sequence Code Division Multiple Access,Expectation Maximization,Irregular Repeat-accumulate Codes,Iterative Channel Estimation,Pilot Symbols,Spectral Efficiencies,Algorithm,Cellular Radio Systems,Estimation,Iterative Decoding,Power Spectral Density,Code Division Multiple Access
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Citation
D. Torrieri, A. Mukherjee and H. M. Kwon, "Coded DS-CDMA systems with iterative channel estimation and no pilot symbols," in IEEE Transactions on Wireless Communications, vol. 9, no. 6, pp. 2012-2021, June 2010, doi: 10.1109/TWC.2010.06.090814
Abstract
In this paper, we describe direct-sequence code-division multiple-access (DS-CDMA) systems with quadriphase-shift keying in which channel estimation, coherent demodulation, and decoding are iteratively performed without the use of any training or pilot symbols. An expectation-maximization channel-estimation algorithm for the fading amplitude, phase, and the interference power spectral density (PSD) due to the combined interference and thermal noise is proposed for DS-CDMA systems with irregular repeat-accumulate codes. After initial estimates of the fading amplitude, phase, and interference PSD are obtained from the received symbols, subsequent values of these parameters are iteratively updated by using the soft feedback from the channel decoder. The updated estimates are combined with the received symbols and iteratively passed to the decoder. The elimination of pilot symbols simplifies the system design and allows either an enhanced information throughput, an improved bit error rate, or greater spectral efficiency. The interference-PSD estimation enables DS-CDMA systems to significantly suppress interference. © 2002-2012 IEEE. © 2013 Elsevier B.V., All rights reserved.
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This is an open access article under the CC by license.
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IEEE
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IEEE Transactions on Wireless Communications
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1536-1276
1558-2248
1558-2248