Detection of OFDM signals in fast time-varying channels with ICI self-cancellation

Tsung Da Hsieh, Ming-Xian Chang

研究成果: Conference contribution

2 引文 斯高帕斯(Scopus)

摘要

In fast time-varying environments, an OFDM system needs to insert denser pilot symbols among transmitted symbols for tracking the variation of the channel. To reduce the number of pilots, several algorithms including blind, semi-blind, and decision-directed (DD) approaches are proposed. Most of these algorithms assume the channel varies block-wisely, but remain invariant within one OFDM block duration. However, such channel model neglects the inter-(sub)channel interference (ICI) and may be not practical for fast time-varying channels. In this paper, we propose an ICI self-cancellation algorithm under an architecture that could be readily incorporated into an OFDM system that does not take the ICI into consideration. Our algorithm involves only periodic extension and linear combination, and incurs almost no additional complexity. The ICI can be completely removed if the variation of each path in the channel is linear with time during one extended OFDM block. Our algorithm also provides a trade-off between performance and throughput. To validates the proposed algorithm, we incorporate it into an OFDM system with pseudo-pilot (PP) detection. The simulation validates the efficiency of the proposed algorithm, and that neglecting the ICI in fast time-varying channels is impractical.

原文English
主出版物標題2009 IEEE Sarnoff Symposium, SARNOFF 2009 - Conference Proceedings
DOIs
出版狀態Published - 2009 七月 23
事件2009 IEEE Sarnoff Symposium, SARNOFF 2009 - Princeton, NJ, United States
持續時間: 2009 三月 302009 四月 1

出版系列

名字2009 IEEE Sarnoff Symposium, SARNOFF 2009 - Conference Proceedings

Other

Other2009 IEEE Sarnoff Symposium, SARNOFF 2009
國家/地區United States
城市Princeton, NJ
期間09-03-3009-04-01

All Science Journal Classification (ASJC) codes

  • 電腦網路與通信
  • 電氣與電子工程
  • 通訊

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