A Channel Estimation Scheme with Low Complexity in the Presence of the Virtual Subcarriers for OFDM Systems

SUN Feifei, LIU Danpu, ZHANG Jianhua, YUE Guangxin
JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOMMUNICATIONS 2010 (Vol. 33 (1))
DOI:
Publish Year: 2010, content in Simplified Chinese

Abstract: Based on discrete Fourier transform(DFT) estimator, the effect of virtual subcarriers is analyzed. It is shown that, on edge subcarriers, the estimation errors caused by channel information missing are much larger than that caused by noise. Therefore the estimation errors of edge subcarriers are getting worse. A low complexity channel estimator is proposed. The proposed estimator takes the least square(LS) estimation instead of the DFT estimation on edge subcarriers. Then replacement criteria and the bound of mean square error(MSE) are presented. The simulation shows that the MSE and BER performances of the proposed method are better than that of LS estimator or DFT-based estimator.

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