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Title: Parameter estimation and equalization techniques for communication channels with multipath and multiple frequency offsets
Authors: Ahmed, S.
Lambotharan, Sangarapillai
Jakobsson, Andreas
Chambers, Jonathon
Keywords: Frequency offset (FO) estimation
Minimum mean-square error (MMSE) equalizer and complexity
Wireless multipath channels
Issue Date: 2005
Publisher: © IEEE
Citation: AHMED, S. ... et al, 2005. Parameter estimation and equalization techniques for communication channels with multipath and multiple frequency offsets. IEEE Transactions on Communications, 53 (2), pp. 219-223
Abstract: We consider estimation of frequency offset (FO) and equalization of a wireless communication channel, within a general framework which allows for different frequency offsets for various multipaths. Such a scenario may arise due to different Doppler shifts associated with various multipaths, or in situations where multiple basestations are used to transmit identical information. For this general framework, we propose an approximative maximum-likelihood estimator exploiting the correlation property of the transmitted pilot signal. We further show that the conventional minimum mean-square error equalizer is computationally cumbersome, as the effective channel-convolution matrix changes deterministically between symbols, due to the multiple FOs. Exploiting the structural property of these variations, we propose a computationally efficient recursive algorithm for the equalizer design. Simulation results show that the proposed estimator is statistically efficient, as the mean-square estimation error attains the Crame´r-Rao lower bound. Further, we show via extensive simulations that our proposed scheme significantly outperforms equalizers not employing FO estimation.
Description: This is an article from the journal, IEEE Transactions on Communications [© IEEE]. It is also available at: http://ieeexplore.ieee.org/ 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.
Version: Published
DOI: 10.1109/TCOMM.2004.841970
URI: https://dspace.lboro.ac.uk/2134/5787
ISSN: 0090-6778
Appears in Collections:Published Articles (Mechanical, Electrical and Manufacturing Engineering)

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