Channel estimation for space time coded ofdm systems in non-sample-spaced multipath channels

Runhua Chen, Khaled Letaief

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

Space-time (ST) coded OFDM has been proved to be an effective and promising technique for future wideband wireless data access. As the multiple transmit antennas transmit signals act as co-channel interference to each other, the channel estimation for ST-coded OFDM systems is different from the single transmit antenna scenario. Channel estimation can be achieved by estimating the channel impulse response based upon a discrete Fourier transform (DFT). However, in a multipath channel with non-sample-spaced time delays, this approach will cause power leakage and result in an error floor. In this paper, based on the use of IPIC DLL (interpath interference cancellation delay locked loop), we propose a least square (LS) and minimum mean square error (MMSE) channel estimators for ST-coded OFDM with non-sample-spaced multipath time delays. It is shown that the proposed channel estimators can eliminate the error floor substantially and perform quite close to the case with ideal channel state information.

Original languageEnglish
Article number993464
Pages (from-to)61-66
Number of pages6
JournalIEEE Wireless Communications and Networking Conference, WCNC
Volume1
DOIs
Publication statusPublished - 2002
Externally publishedYes

Fingerprint

Multipath propagation
Channel estimation
Orthogonal frequency division multiplexing
Time delay
Antennas
Channel state information
Impulse response
Discrete Fourier transforms
Mean square error

Keywords

  • Channel estimation
  • Nonsample-spaced multipath time delay
  • OFDM
  • Space-time coding

ASJC Scopus subject areas

  • Engineering(all)

Cite this

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abstract = "Space-time (ST) coded OFDM has been proved to be an effective and promising technique for future wideband wireless data access. As the multiple transmit antennas transmit signals act as co-channel interference to each other, the channel estimation for ST-coded OFDM systems is different from the single transmit antenna scenario. Channel estimation can be achieved by estimating the channel impulse response based upon a discrete Fourier transform (DFT). However, in a multipath channel with non-sample-spaced time delays, this approach will cause power leakage and result in an error floor. In this paper, based on the use of IPIC DLL (interpath interference cancellation delay locked loop), we propose a least square (LS) and minimum mean square error (MMSE) channel estimators for ST-coded OFDM with non-sample-spaced multipath time delays. It is shown that the proposed channel estimators can eliminate the error floor substantially and perform quite close to the case with ideal channel state information.",
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AB - Space-time (ST) coded OFDM has been proved to be an effective and promising technique for future wideband wireless data access. As the multiple transmit antennas transmit signals act as co-channel interference to each other, the channel estimation for ST-coded OFDM systems is different from the single transmit antenna scenario. Channel estimation can be achieved by estimating the channel impulse response based upon a discrete Fourier transform (DFT). However, in a multipath channel with non-sample-spaced time delays, this approach will cause power leakage and result in an error floor. In this paper, based on the use of IPIC DLL (interpath interference cancellation delay locked loop), we propose a least square (LS) and minimum mean square error (MMSE) channel estimators for ST-coded OFDM with non-sample-spaced multipath time delays. It is shown that the proposed channel estimators can eliminate the error floor substantially and perform quite close to the case with ideal channel state information.

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