Low-Complexity Channel Estimation Using Short-Point FFT/IFFT for an Iterative Receiver in an LDPC-Coded OFDM System

Authors:
Wu Guan;Haige Xiang
Affiliations:
Institute of Microelectronics of Chinese Academy of Sciences, Beijing, People's Republic of China;School of Electronics Engineering and Computer Science, Peking University, Beijing, People's Republic of China
Venue:
Wireless Personal Communications: An International Journal
Year:
2012

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Abstract

A frequency-domain channel expanding technique (FD-CET) is proposed for channel estimation in an iterative receiver of a low-density parity-check coded orthogonal frequency division multiplexing system. The FD-CET can expand a subset of the frequency-domain channel gains to all of them in a short-point FFT/IFFT format. This technique is applied to estimate the channel gains utilizing the pilots and information from the decoder in an iterative manner. It is a novel low complexity channel estimation method. Numerical results demonstrate that the proposed channel estimator approaches a maximum-likelihood performance within only a few iterations under multi-path channels.