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Parameter estimation and equalization Techniques for communication channels with multipath and multiple frequency offsets

Ahmed, S, Lambotharan, S, Jakobsson, A and Chambers, JA (2005) Parameter estimation and equalization Techniques for communication channels with multipath and multiple frequency offsets IEEE Transactions on Communications, 53 (2). pp. 219-223.

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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 Cramér-Rao lower bound. Further, we show via extensive simulations that our proposed scheme significantly outperforms equalizers not employing FO estimation. © 2005 IEEE.

Item Type: Article
Authors :
NameEmailORCID
Ahmed, SUNSPECIFIEDUNSPECIFIED
Lambotharan, SUNSPECIFIEDUNSPECIFIED
Jakobsson, AUNSPECIFIEDUNSPECIFIED
Chambers, JAj.a.chambers@surrey.ac.ukUNSPECIFIED
Date : 1 February 2005
Identification Number : https://doi.org/10.1109/TCOMM.2004.841970
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 13:27
Last Modified : 17 May 2017 13:27
URI: http://epubs.surrey.ac.uk/id/eprint/839248

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