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Wireless Communications and Mobile Computing
Volume 2017, Article ID 6784142, 9 pages
https://doi.org/10.1155/2017/6784142
Research Article

A Study of an Iterative Channel Estimation Scheme of FS-FBMC System

Konkuk University, Seoul, Republic of Korea

Correspondence should be addressed to JoonTae Kim; rk.ca.kuknok@miktj

Received 31 July 2016; Accepted 5 October 2016; Published 1 January 2017

Academic Editor: Pierre Leone

Copyright © 2017 YongJu Won et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A filter bank multicarrier on offset-quadrature amplitude modulation (FBMC/OQAM) system is an alternative multicarrier modulation scheme that does not need cyclic prefix (CP) even in the presence of a multipath fading channel by the properties of prototype filter. The FBMC/OQAM system can be implemented either by using the poly-phase network with fast fourier transform (PPN-FFT) or by using the extended FFT on a frequency-spreading (FS) domain. In this paper, we propose an iterative channel estimation scheme for each sub channel of a FBMC/OQAM system over a frequency-spreading domain. The proposed scheme first estimates the channel using the received pilot signal in the subchannel domain and interpolates the estimated channel to fine frequency-spreading domain. Then the channel compensated FS domain pilot is despread again to modify the channel state information (CSI) estimation. Computer simulation shows that the proposed method outperforms the conventional FBMC/OQAM channel estimator in a frequency selective channel.