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

doi:10.13190/jbupt.201001.61.214

JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOM ›› 2010, Vol. 33 ›› Issue (1): 61-64.doi: 10.13190/jbupt.201001.61.214

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

SUN Fei-fei；LIU Dan-pu；ZHANG Jian-hua；YUE Guang-xin

(Key Laboratory of Universal Wireless Communication(Beijing University of Posts and Telecommunications), Ministry of Education, Beijing 100876, China)

Received:2009-05-14 Revised:2009-10-21 Online:2010-02-28 Published:2010-02-28
Contact: Sun Fei-Fei

Abstract

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.

Key words: orthogonal frequency division multiplexing, virtual subcarriers, channel estimation

CLC Number:

TN911.22

SUN Fei-fei；LIU Dan-pu；ZHANG Jian-hua；YUE Guang-xin. A Channel Estimation Scheme with Low Complexity in the Presence of the Virtual Subcarriers for OFDM Systems[J]. JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOM, 2010, 33(1): 61-64.

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

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