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JMT 2012, Vol. 20 Issue (4) :220-226     DOI: 10.3969/j.issn.2095-087X.2012.04.005
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Modified clustered comb pilot-aided fast time-varying channel estimation for OFDM system
Xin LI, Pingzhi FAN*
Institute of Mobile Communications, Southwest Jiaotong University, Chengdu 610031, China

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Abstract As high-speed railway is booming worldwide, the communication system with fast-time varying channel has drawn great attention. The comb pilot based linear minimum mean square error (LMMSE) channel estimator is proved to be an effective method for fast time-varying channel estimation. In this paper, the clustered comb pilot-aided channel estimation for orthogonal frequency-division multiplexing (OFDM) system is discussed, where the time varying channel is approximated by a basis expansion model (BEM). A modified clustered comb pilot structure is proposed and justified to improve the estimation performance compared with the clustered comb pilot proposed by Tang. Based on the complex-exponential BEM (CE-BEM) model, a suboptimal-pilot structure is proposed. In addition, optimal pilot length is analyzed and simulated with a predefined total number of pilots. The simulation results show that the modified clustered comb pilot can greatly reduce the estimation error especially with high Doppler spread. The suboptimal-pilot structure with guard pilot approximation is proven to be competitive. Optimal nonzero pilot lengths for different Doppler spread are obtained by simulation with a predefined channel order and fixed pilot subcarriers.
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Xin LI
Pingzhi FAN
KeywordsOFDM   LMMSE   BEM   clustered comb pilot   high mobility     
Received 2012-10-21;
Cite this article:   
Xin LI, Pingzhi FAN.Modified clustered comb pilot-aided fast time-varying channel estimation for OFDM system[J]  JMT, 2012,V20(4): 220-226
http://jmt.swjtu.edu.cn/EN/10.3969/j.issn.2095-087X.2012.04.005      or     http://jmt.swjtu.edu.cn/EN/Y2012/V20/I4/220
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