Low complexity iterative method of equalization for OFDM in doubly selective channels

S. Ahmed; M. Sellathurai; J. A. Chambers

doi:10.1109/ACSSC.2005.1599839

Low complexity iterative method of equalization for OFDM in doubly selective channels

S. Ahmed^*, M. Sellathurai, J. A. Chambers

^*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

5 Citations (Scopus)

Abstract

In a multi-path channel an orthogonal frequency division multiplexing (OFDM) system is very robust to frequency selective fading, but it is sensitive to the time selective fading of the mobile channel. Time selectivity of the channel causes inter-carrier-interference (ICI) in OFDM, thereby degrading the performance significantly and increasing the computational complexity of the receiver. On the other hand, it introduces temporal and frequency diversity. In this work, a low complexity iterative method is addressed to compensate for the adverse effects of time and frequency selectivity of the channel while achieving the diversity benefits. The method splits the equalization into two stages. The first stage exploits the sparsity present in the channel convolution matrix (CCM) to estimate the time domain transmitted samples and the second stage performs the maximum a posteriori (MAP) detection of the frequency domain symbols. Simulation results show the performance of the proposed algorithm is close to the match filter bound (MFB) with lower computational complexity.

Original language	English
Title of host publication	Conference Record of The Thirty-Ninth Asilomar Conference on Signals, Systems and Computers
Publisher	IEEE
Pages	687-691
Number of pages	5
ISBN (Print)	1424401313, 9781424401314
DOIs	https://doi.org/10.1109/ACSSC.2005.1599839
Publication status	Published - 2005
Event	39th Asilomar Conference on Signals, Systems and Computers 2005 - Pacific Grove, CA, United States Duration: 28 Oct 2005 → 1 Nov 2005

Conference

Conference	39th Asilomar Conference on Signals, Systems and Computers 2005
Country/Territory	United States
City	Pacific Grove, CA
Period	28/10/05 → 1/11/05

Keywords

Doubly selective channel
Iterative equalization
OFDM

ASJC Scopus subject areas

Signal Processing
Computer Networks and Communications

Access to Document

10.1109/ACSSC.2005.1599839

Cite this

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title = "Low complexity iterative method of equalization for OFDM in doubly selective channels",

abstract = "In a multi-path channel an orthogonal frequency division multiplexing (OFDM) system is very robust to frequency selective fading, but it is sensitive to the time selective fading of the mobile channel. Time selectivity of the channel causes inter-carrier-interference (ICI) in OFDM, thereby degrading the performance significantly and increasing the computational complexity of the receiver. On the other hand, it introduces temporal and frequency diversity. In this work, a low complexity iterative method is addressed to compensate for the adverse effects of time and frequency selectivity of the channel while achieving the diversity benefits. The method splits the equalization into two stages. The first stage exploits the sparsity present in the channel convolution matrix (CCM) to estimate the time domain transmitted samples and the second stage performs the maximum a posteriori (MAP) detection of the frequency domain symbols. Simulation results show the performance of the proposed algorithm is close to the match filter bound (MFB) with lower computational complexity.",

keywords = "Doubly selective channel, Iterative equalization, OFDM",

author = "S. Ahmed and M. Sellathurai and Chambers, {J. A.}",

year = "2005",

doi = "10.1109/ACSSC.2005.1599839",

language = "English",

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pages = "687--691",

booktitle = "Conference Record of The Thirty-Ninth Asilomar Conference on Signals, Systems and Computers",

publisher = "IEEE",

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note = "39th Asilomar Conference on Signals, Systems and Computers 2005 ; Conference date: 28-10-2005 Through 01-11-2005",

}

Ahmed, S, Sellathurai, M & Chambers, JA 2005, Low complexity iterative method of equalization for OFDM in doubly selective channels. in Conference Record of The Thirty-Ninth Asilomar Conference on Signals, Systems and Computers. IEEE, pp. 687-691, 39th Asilomar Conference on Signals, Systems and Computers 2005, Pacific Grove, CA, United States, 28/10/05. https://doi.org/10.1109/ACSSC.2005.1599839

TY - GEN

T1 - Low complexity iterative method of equalization for OFDM in doubly selective channels

AU - Ahmed, S.

AU - Sellathurai, M.

AU - Chambers, J. A.

PY - 2005

Y1 - 2005

N2 - In a multi-path channel an orthogonal frequency division multiplexing (OFDM) system is very robust to frequency selective fading, but it is sensitive to the time selective fading of the mobile channel. Time selectivity of the channel causes inter-carrier-interference (ICI) in OFDM, thereby degrading the performance significantly and increasing the computational complexity of the receiver. On the other hand, it introduces temporal and frequency diversity. In this work, a low complexity iterative method is addressed to compensate for the adverse effects of time and frequency selectivity of the channel while achieving the diversity benefits. The method splits the equalization into two stages. The first stage exploits the sparsity present in the channel convolution matrix (CCM) to estimate the time domain transmitted samples and the second stage performs the maximum a posteriori (MAP) detection of the frequency domain symbols. Simulation results show the performance of the proposed algorithm is close to the match filter bound (MFB) with lower computational complexity.

AB - In a multi-path channel an orthogonal frequency division multiplexing (OFDM) system is very robust to frequency selective fading, but it is sensitive to the time selective fading of the mobile channel. Time selectivity of the channel causes inter-carrier-interference (ICI) in OFDM, thereby degrading the performance significantly and increasing the computational complexity of the receiver. On the other hand, it introduces temporal and frequency diversity. In this work, a low complexity iterative method is addressed to compensate for the adverse effects of time and frequency selectivity of the channel while achieving the diversity benefits. The method splits the equalization into two stages. The first stage exploits the sparsity present in the channel convolution matrix (CCM) to estimate the time domain transmitted samples and the second stage performs the maximum a posteriori (MAP) detection of the frequency domain symbols. Simulation results show the performance of the proposed algorithm is close to the match filter bound (MFB) with lower computational complexity.

KW - Doubly selective channel

KW - Iterative equalization

KW - OFDM

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U2 - 10.1109/ACSSC.2005.1599839

DO - 10.1109/ACSSC.2005.1599839

M3 - Conference contribution

AN - SCOPUS:33847630882

SN - 1424401313

SN - 9781424401314

SP - 687

EP - 691

BT - Conference Record of The Thirty-Ninth Asilomar Conference on Signals, Systems and Computers

PB - IEEE

T2 - 39th Asilomar Conference on Signals, Systems and Computers 2005

Y2 - 28 October 2005 through 1 November 2005

ER -

Low complexity iterative method of equalization for OFDM in doubly selective channels

Abstract

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Keywords

ASJC Scopus subject areas

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