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

Tsung Da Hsieh, Ming-Xian Chang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

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.

Original languageEnglish
Title of host publication2009 IEEE Sarnoff Symposium, SARNOFF 2009 - Conference Proceedings
DOIs
Publication statusPublished - 2009 Jul 23
Event2009 IEEE Sarnoff Symposium, SARNOFF 2009 - Princeton, NJ, United States
Duration: 2009 Mar 302009 Apr 1

Publication series

Name2009 IEEE Sarnoff Symposium, SARNOFF 2009 - Conference Proceedings

Other

Other2009 IEEE Sarnoff Symposium, SARNOFF 2009
CountryUnited States
CityPrinceton, NJ
Period09-03-3009-04-01

All Science Journal Classification (ASJC) codes

  • Computer Networks and Communications
  • Electrical and Electronic Engineering
  • Communication

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    Hsieh, T. D., & Chang, M-X. (2009). Detection of OFDM signals in fast time-varying channels with ICI self-cancellation. In 2009 IEEE Sarnoff Symposium, SARNOFF 2009 - Conference Proceedings [4850288] (2009 IEEE Sarnoff Symposium, SARNOFF 2009 - Conference Proceedings). https://doi.org/10.1109/SARNOF.2009.4850288