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Enhanced MMSE channel estimation using timing error statistics for wireless OFDM systems

Athaudage, Chandranath R. N. & Jayalath, Dhammika (2004) Enhanced MMSE channel estimation using timing error statistics for wireless OFDM systems. IEEE Transactions on Broadcasting, 50(4), pp. 369-376.

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Abstract

Estimation and tracking of the frequency-selective time-varying channel response is a challenging task for wireless communication systems incorporating coherent OFDM. In pilot-symbol-assisted (PSA) OFDM systems, the minimum mean-square-error (MMSE) estimator provides the optimum performance based on the channel statistics (channel correlation function and SNR). In OFDM systems, FFT-block timing error introduces a linear phase rotation to data modulated on individual subcarriers. An MMSE channel estimator designed only using the wireless channel statistics performs only sub-optimally when subcarrier phase rotations due to block timing errors are present. In this paper, we show that by using the block timing error statistics of the OFDM time-synchronizer the performance of the MMSE channel estimation can be significantly improved. Numerical results show that the bit-error-probability (BEP) performance degradation due to timing errors can be almost completely recovered by the proposed technique.

Impact and interest:

23 citations in Scopus
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14 citations in Web of Science®

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ID Code: 13734
Item Type: Journal Article
Keywords: Bit, error, probability, MMSE, OFDM, Rayleigh fading, channel estimation, estimation, minimum mean, square, error, pilot carriers, power delay spread, time synchronization
DOI: 10.1109/TBC.2004.837861
ISSN: 0018-9316
Subjects: Australian and New Zealand Standard Research Classification > TECHNOLOGY (100000) > COMMUNICATIONS TECHNOLOGIES (100500) > Communications Technologies not elsewhere classified (100599)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Copyright Owner: Copyright 2004 IEEE
Copyright Statement: Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Deposited On: 12 Jun 2008
Last Modified: 01 Mar 2012 00:02

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