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Semiblind Channel Estimation and Data Detection for OFDM Systems With Optimal Pilot Design

Cui, Tao and Tellambura, Chintha (2007) Semiblind Channel Estimation and Data Detection for OFDM Systems With Optimal Pilot Design. IEEE Transactions on Communications, 55 (5). pp. 1053-1062. ISSN 0090-6778.

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This paper considers semiblind channel estimation and data detection for orthogonal frequency-division multiplexing (OFDM) over frequency-selective fading channels. We show that the samples of an OFDM symbol are jointly complex Gaussian distributed, where the mean and covariance are determined by the locations and values of fixed pilot symbols. We exploit this distribution to derive a novel maximum-likelihood (ML) semiblind gradient-descent channel estimator. By exploiting the channel impulse response (CIR) statistics, we also derive a semiblind data detector for both Rayleigh and Ricean fading channels. Furthermore, we develop an enhanced data detector, which uses the estimator error statistics to mitigate the effect of channel estimation errors. Efficient implementation of both the semiblind and the improved data detectors is provided via sphere decoding and nulling-canceling detection. We also derive the Cramér-Rao bound (CRB) and design optimal pilots by minimizing the CRB. Our proposed channel estimator and data detector exhibit high bandwidth efficiency (requiring only a few pilot symbols), achieve the CRB, and also nearly reach the performance of an ideal reference receiver.

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Additional Information:© Copyright 2007 IEEE. Reprinted with permission. Paper approved by N. Al-Dhahir, the Editor for Space–Time, OFDM, and Equalization of the IEEE Communications Society. Manuscript received April 14, 2006; revised July 17, 2006 and August 17, 2006. [Posted online: 2007-05-15] This work was supported in part by the Natural Sciences and Engineering Research Council of Canada, in part by the Informatics Circle of Research Excellence, and in part by the Alberta Ingenuity Fund. This paper was presented in part at the IEEE International Conference on Communications, Seoul, Korea, May 2005. The authors would like to thank the anonymous reviewers for their critical comments that greatly improved this paper. Especially, they thank one of the anonymous reviewers for the comments on the global minimum of (12).
Subject Keywords:Channel estimation, data detection, orthogonal frequency-division multiplexing (OFDM)
Issue or Number:5
Record Number:CaltechAUTHORS:CUIieeetc07a
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:8108
Deposited By: Archive Administrator
Deposited On:30 Jul 2007
Last Modified:02 Oct 2019 23:48

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