Journal of South China University of Technology (Natural Science Edition) ›› 2013, Vol. 41 ›› Issue (5): 43-47,54.doi: 10.3969/j.issn.1000-565X.2013.05.007

• Electronics, Communication & Automation Technology • Previous Articles     Next Articles

Windowed Channel Estimation of OFDM Systems in Linear Time-Varying Channels

Xie Yong-sheng Wang Ming-liang Zhou Lei-lei   

  1. Key Laboratory of Wireless Sensor Network & Communication,Shanghai Institute of Microsystem and Information Technology,Chinese Academy of Sciences,Shanghai 200050,China
  • Received:2012-09-01 Revised:2012-09-10 Online:2013-05-25 Published:2013-04-01
  • Contact: 解永生(1984-) ，男，博士，主要从事无线传感器网络研究． E-mail:xieysh@gmail.com
  • About author:解永生(1984-) ，男，博士，主要从事无线传感器网络研究．
  • Supported by:

    国家科技重大专项( 2010ZX03006-003)

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Abstract:

Due to the time-varying characteristics,the channel matrix in the frequency domain of OFDM ( OrthogonalFrequency Division Multiplexing) system is approximately banded.Although the receiver window can improve theband-limited characteristics of time-varying channels,the equivalent channel cannot be modeled linearly.In orderto solve this problem,a new windowed-LTV ( Linear Time-Varying) model is proposed,which separates the timevaryingcharacteristics of the receiver window from those of the channel.Moreover,a time-varying channel estimationmethod of the model is investigated,and a simplified algorithm is presented to reduce the computational complexity.Simulated results show that the receiver window reduces the inter-subcarrier interference out of the band ofthe channel,and that,as compared with the traditional OFDM methods,the proposed algorithm brings about a performanceimprovement of 2.5 dB.

Key words: orthogonal frequency division multiplexing, channel estimation, inter-subcarrier interference, linear time-varying channel