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Channel Estimation for MC-CDMA with Compensation of Synchronization Errors

Zhang, Yuan, Hoshyar, Reza and Tafazolli, Rahim (2004) Channel Estimation for MC-CDMA with Compensation of Synchronization Errors IEEE 60th Vehicular Technology Conference, Volume. pp. 808-812. ISSN 1090-3038

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Abstract

In this paper, we investigate channel estimation for MC-CDMA in the presence of time and frequency synchronization errors. Channel estimation in MC-CDMA requires transmission of pilot tones, based on which MMSE interpolation or FFT-based interpolation algorithms are applied. Most channel estimation methods in literature assume perfect synchronization. However, this condition is not guaranteed in the actual case, and channel estimators are always expected to work as a fine synchronizer which has some ability to compensate synchronization errors [1]. Multicarrier systems are very sensitive to synchronization errors. Uncorrected errors cause inter-carrier interference (ICI) and degrade the performance significantly. In this paper, we analyze the effect of synchronization errors on the performance of pilot-aided channel estimators, and propose low complexity methods to compensate the residual timing and frequency offset respectively. We estimate the timing offset in frequency domain by a single frequency estimation technique, and iteratively search the frequency offset based on the interference power at the certain set of subcarriers. Simulation results show that our methods improve the performance of channel estimators considerably in imperfect synchronization conditions.

Item Type: Article
Additional Information: ©2004 IEEE. 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.
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Divisions: Faculty of Engineering and Physical Sciences > Electronic Engineering > Centre for Communication Systems Research
Depositing User: Melanie Hughes
Date Deposited: 21 Sep 2010 08:21
Last Modified: 23 Sep 2013 18:37
URI: http://epubs.surrey.ac.uk/id/eprint/2314

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