Adaptive channel estimation and interference cancellation in space-time coded OFDM systems

A Nallanathan*, QS Sen

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference paperpeer-review

8 Citations (Scopus)

Abstract

This paper presents an LSE-RLS interference suppression scheme for space-time block coded orthogonal frequency division multiplexing (ST-OFDM) systems over frequency selective fading channels. We consider a multi-user environment with K synchronous co-channel users, each equipped with n transmit antennas. The receiver is equipped with m(greater than or equal toK) receive antennas. The proposed scheme utilizes OFDM to transform frequency selective fading channels into multiple flat fading subchannels on which space-time coding is applied. It is shown that by applying the LSE-RLS algorithm over each sub channel at the receiver, the proposed scheme is capable of suppressing the interference from the K co-channel users without any explicit knowledge of the channel or the interference. The proposed scheme is computationally less intensive than the MMSE scheme which assumes perfect channel knowledge and retains the simple linear decoding property of space-time block codes with acceptable performance degradation due to imperfect channel estimation.

Original languageEnglish
Title of host publicationVTC2004-SPRING: 2004 IEEE 59TH VEHICULAR TECHNOLOGY CONFERENCE, VOLS 1-5, PROCEEDINGS
Place of PublicationNEW YORK
PublisherIEEE
Pages1760-1764
Number of pages5
ISBN (Print)0-7803-8255-2
Publication statusPublished - 2004
Event59th IEEE Vehicular Technology Conference - Milan, Italy
Duration: 17 May 200419 May 2004

Conference

Conference59th IEEE Vehicular Technology Conference
Country/TerritoryItaly
Period17/05/200419/05/2004

Keywords

  • co-channel interference cancellation
  • MIMO
  • multi-users
  • OFDM
  • RLS
  • space-time codes

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