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

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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.

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Authors and Affiliations

  1. Institute of Microelectronics of Chinese Academy of Sciences, Beijing, People’s Republic of China

    Wu Guan

  2. School of Electronics Engineering and Computer Science, Peking University, Beijing, People’s Republic of China

    Haige Xiang

Authors
  1. Wu Guan
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  2. Haige Xiang
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Correspondence to Wu Guan.

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Guan, W., Xiang, H. Low-Complexity Channel Estimation Using Short-Point FFT/IFFT for an Iterative Receiver in an LDPC-Coded OFDM System. Wireless Pers Commun 64, 739–747 (2012). https://doi.org/10.1007/s11277-010-0216-0

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  • DOI: https://doi.org/10.1007/s11277-010-0216-0

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