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

Ghazi A. Al-Rawi; Tareq Y. Al-Naffouri; Ahmad Bahai; John Cioffi

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

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

^*Corresponding author for this work

Research output: Contribution to journal › Conference article › peer-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 language	English (US)
Pages (from-to)	3371-3376
Number of pages	6
Journal	IEEE International Conference on Communications
Volume	5
State	Published - 2003
Externally published	Yes
Event	2003 International Conference on Communications (ICC 2003) - Anchorage, AK, United States Duration: May 11 2003 → May 15 2003

Keywords

Channel estimation and tracking
Iterative receiver
Multicarrier transmission

ASJC Scopus subject areas

Computer Networks and Communications
Electrical and Electronic Engineering

Cite this

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title = "An iterative receiver for coded OFDM systems over time-varying wireless channels",

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.",

keywords = "Channel estimation and tracking, Iterative receiver, Multicarrier transmission",

author = "Al-Rawi, {Ghazi A.} and Al-Naffouri, {Tareq Y.} and Ahmad Bahai and John Cioffi",

year = "2003",

language = "English (US)",

volume = "5",

pages = "3371--3376",

journal = "IEEE International Conference on Communications",

issn = "0536-1486",

publisher = "Institute of Electrical and Electronics Engineers Inc.",

note = "2003 International Conference on Communications (ICC 2003) ; Conference date: 11-05-2003 Through 15-05-2003",

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T1 - An iterative receiver for coded OFDM systems over time-varying wireless channels

AU - Al-Rawi, Ghazi A.

AU - Al-Naffouri, Tareq Y.

AU - Bahai, Ahmad

AU - Cioffi, John

PY - 2003

Y1 - 2003

N2 - 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.

AB - 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.

KW - Channel estimation and tracking

KW - Iterative receiver

KW - Multicarrier transmission

UR - http://www.scopus.com/inward/record.url?scp=0038649079&partnerID=8YFLogxK

M3 - Conference article

AN - SCOPUS:0038649079

SN - 0536-1486

VL - 5

SP - 3371

EP - 3376

JO - IEEE International Conference on Communications

JF - IEEE International Conference on Communications

T2 - 2003 International Conference on Communications (ICC 2003)

Y2 - 11 May 2003 through 15 May 2003

ER -

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

Abstract

Keywords

ASJC Scopus subject areas

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