Low-complexity channel estimation for wireless OFDM systems

Athaudage, Chandranath R. N. & Jayalath, Dhammika (2003) Low-complexity channel estimation for wireless OFDM systems. In 14th IEEEConference on Personal, Indoor and Mobile Radio Communications, 2003 (PIMRC 2003), 7-10 Sept. 2003, Beijing, China.

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Wireless communication systems incorporating coherent OFDM requires the estimation and tracking of the time-varying channel response for accurate demodulation of data at the receiver. In pilot-symbol-assisted (PSA) OFDM systems, the minimum mean-square-error (MMSE) estimator is a good channel estimation technique given that channel statistics are known. However, the major drawback of the MMSE estimator is its high computational complexity, which grows with number of pilots. Piecewise-linear interpolation is a low complexity solution to the channel estimation task. In this paper we derive exact expressions for the channel estimation error as a function of pilot spacing, channel statistics and channel noise, when piecewise-linear interpolation is incorporated. We compare the performance of piecewise-linear interpolation against that of a low complexity MMSE technique (piecewise-MMSE interpolation) under both matched and mismatched conditions of channel statistics. Results show that a piecewise-linear interpolator performs better than a mismatched piecewise-MSSE interpolator of same complexity.

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ID Code: 13781
Item Type: Conference Paper
Refereed: Yes
Keywords: OFDM, Channel Estimation
DOI: 10.1109/PIMRC.2003.1264326
ISBN: 0780378229
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 2003 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: 16 Jun 2008 00:00
Last Modified: 29 Feb 2012 14:02

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