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JMT 2012, Vol. 20 Issue (4) :234-242    DOI: 10.3969/j.issn.2095-087X.2012.04.007
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Signal detection through circular convolution reconstruction for OFDM system in fast varying channel
Hai ZUO1, Xia LEI1, Rongzhen LE1, Maozhu JIN2*
1. National Key Laboratory of Science and Technology on Communications, University of Electronic Science and Technology of China, Chengdu 610054, China ;
2. Business School, Sichuan University, Chengdu 610065, China

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Abstract A signal detection algorithm is proposed for the orthogonal frequency division multiplexing (OFDM) system in the presence of fast time-varying channel. The channel is represented by a piece-wise linear variant model with normalized Doppler frequency of less than 0.2. The channel parameters are extracted through ISI/ICI (inter-symbol interference/inter-carrier interference) cancellation and circular convolution reconstruction. Meanwhile, an improved OFDM symbol detection algorithm is also proposed based on circular convolution reconstruction. The channel state information in the OFDM symbol duration can be obtained accurately from the adjacent two block pilots in a linear model. The simulation results show that the proposed method can not only track the channel variation, but also promise better performance gain in the OFDM symbol detection. Furthermore, the bit error ratio (BER) is close to the performance with the perfect channel state information.
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Rongzhen LE
Maozhu JIN
KeywordsOFDM   inter-symbol interference   inter-carrier interference   circular convolution reconstruction     
Received 2012-10-15;

This work was supported by the National Natural Science Foundation of China (Nos. 61032002, 71020107027, 71001075, and 60902026), and Chinese Important National Science & Technology Specific Projects (No. 2011ZX03001-007-01).

Cite this article:   
Hai ZUO, Xia LEI, Rongzhen LE, Maozhu JIN.Signal detection through circular convolution reconstruction for OFDM system in fast varying channel[J]  JMT, 2012,V20(4): 234-242
http://jmt.swjtu.edu.cn/EN/10.3969/j.issn.2095-087X.2012.04.007      or     http://jmt.swjtu.edu.cn/EN/Y2012/V20/I4/234
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