FBMC system: an insight into doubly dispersive channel impact

Zhang, L., Xiao, P., Zafar, A., ul Quddus, A. and Tafazolli, R. (2017) FBMC system: an insight into doubly dispersive channel impact. IEEE Transactions on Vehicular Technology, 66(5), pp. 3942-3956. (doi:10.1109/TVT.2016.2602096)

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Abstract

It has been claimed that filter bank multicarrier (FBMC) systems suffer from negligible performance loss caused by moderate dispersive channels in the absence of guard time protection between symbols. However, a theoretical and systematic explanation/analysis for the statement is missing in the literature to date. In this paper, based on one-tap minimum mean square error (MMSE) and zero-forcing (ZF) channel equalizations, the impact of doubly dispersive channel on the performance of FBMC systems is analyzed in terms of mean square error of received symbols. Based on this analytical framework, we prove that the circular convolution property between symbols and the corresponding channel coefficients in the frequency domain holds loosely with a set of inaccuracies. To facilitate analysis, we first model the FBMC system in a vector/matrix form and derive the estimated symbols as a sum of desired signal, noise, intersymbol interference (ISI), intercarrier interference (ICI), interblock interference (IBI), and estimation bias in the MMSE equalizer. Those terms are derived one-by-one and expressed as a function of channel parameters. The numerical results reveal that under harsh channel conditions, e.g., with large Doppler spread or channel delay spread, the FBMC system performance may be severely deteriorated and error floor will occur.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Zhang, Dr Lei
Authors: Zhang, L., Xiao, P., Zafar, A., ul Quddus, A., and Tafazolli, R.
College/School:College of Science and Engineering > School of Engineering
Journal Name:IEEE Transactions on Vehicular Technology
Publisher:IEEE
ISSN:0018-9545
ISSN (Online):1939-9359
Published Online:24 August 2017
Copyright Holders:Copyright © 2016 IEEE
First Published:First published in IEEE Transactions on Vehicular Technology 66(5): 3942-3956
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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