An iterative receiver for coded OFDM systems over time-varying wireless channels

Ghazi A. Al-Rawi*, Tareq Al-Naffouri, Ahmad Bahai, John Cioffi

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

11 Scopus citations

Abstract

This paper presents a low-complexity Iterative receiver for coded OFDM systems. We present an EM-based iterative algorithm for combined channel estimation and decoding that makes collective use of the available data and system constraints. Minimum number of pilots are sent only in the first symbol of the packet to acquire the channel; then the iterative algorithm is used to track the channel time variation, which is assumed to follow a state-space model, using an EM-based Kalman filter. Data recovery can be achieved within a single OFDM symbol. We also propose the use of an optional outer LDPC code in serial concatenation to offer a trade-off between latency and performance, especially for multi-amplitude modulations, without affecting the complexity of the core iterative algorithm.

Original languageEnglish (US)
Pages (from-to)3371-3376
Number of pages6
JournalIEEE International Conference on Communications
Volume5
StatePublished - Jul 18 2003
Event2003 International Conference on Communications (ICC 2003) - Anchorage, AK, United States
Duration: May 11 2003May 15 2003

Keywords

  • Channel estimation and tracking
  • Iterative receiver
  • Multicarrier transmission

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Electrical and Electronic Engineering

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