Channel Estimation Technique Assisted by Postfixed PN Sequences with Zero Padding for Wireless OFDM Communications

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概要

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• This paper proposes a channel estimation technique which uses a postfixed pseudo-noise (PN) sequence combined with zero padding to accurately estimate the channel impulse response for mobile orthogonal frequency division multiplexing (OFDM) communications. The major advantage of the proposed techniques is the periodical insertion of PN sequences after each OFDM symbol within the original guard interval in conventional zero-padded OFDM or within the original cyclic prefix (CP) in conventional CP-OFDM. In addition, the proposed technique takes advantage of null samples padded after the PN sequences for reducing inter-symbol interference occurring with the information detection in conventional pseudo-random-postfix OFDM. The proposed technique successfully applies either (1) least-squares algorithm with decision-directed data-assistance, (2) approximate least-squares estimation, or (3) maximum-likelihood scheme with various observation windows for the purpose of improving channel estimation performance. Some comparative simulations are given to illustrate the excellent performance of the proposed channel estimation techniques in mobile environments.

• （社）電子情報通信学会の論文
• 2008-04-01

著者

• LIN Jung-Shan

  Department of Electrical Engineering, National Chi Nan University

• CHEN Hong-Yu

  Grad. Inst. of Communication Engineering, National Chi Nan University

• LIN Jia-Chin

  Dept. of Communication Engineering, National Central University

• Chen Hong-yu

  Grad. Inst. Of Communication Engineering National Chi Nan University

• Lin Jung-shan

  Department Of Electrical Engineering National Chi Nan University

関連論文

• Channel Estimation Technique Assisted by Postfixed PN Sequences with Zero Padding for Wireless OFDM Communications
• Channel Estimation Technique Assisted by Postfixed PN Sequences with Zero Padding for Wireless OFDM Communications

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