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The Scientific World Journal
Volume 2014 (2014), Article ID 813429, 6 pages
http://dx.doi.org/10.1155/2014/813429
Research Article

Channel Estimation in DCT-Based OFDM

Institute of Communication Engineering, PLA University of Science and Technology, Yudao Street 14, Nanjing 210007, China

Received 16 January 2014; Accepted 20 February 2014; Published 13 March 2014

Academic Editors: Y. Mao, X. Meng, and Z. Zhou

Copyright © 2014 Yulin Wang 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

This paper derives the channel estimation of a discrete cosine transform- (DCT-) based orthogonal frequency-division multiplexing (OFDM) system over a frequency-selective multipath fading channel. Channel estimation has been proved to improve system throughput and performance by allowing for coherent demodulation. Pilot-aided methods are traditionally used to learn the channel response. Least square (LS) and mean square error estimators (MMSE) are investigated. We also study a compressed sensing (CS) based channel estimation, which takes the sparse property of wireless channel into account. Simulation results have shown that the CS based channel estimation is expected to have better performance than LS. However MMSE can achieve optimal performance because of prior knowledge of the channel statistic.