Decoupled maximum likelihood blind carrier offset estimator for OFDM systems

MM Lu; A Nallanathan; TT Tjhung

Decoupled maximum likelihood blind carrier offset estimator for OFDM systems

MM Lu^*, A Nallanathan, TT Tjhung

^*Corresponding author for this work

National University of Singapore

Research output: Chapter in Book/Report/Conference proceeding › Conference paper › peer-review

Abstract

In orthogonal frequency division multiplexing (OFDM) communication systems, the loss of orthogonality between the sub-carriers due to carrier-frequency offset can degrade the performance of the system. It must be compensated before the discrete Fourier transform-based demodulation. The estimation procedure based on the traditional maximum likelihood (NIL) criterion usually relies on the excess cyclic prefix (CP) symbols of OFDM system, hence reduces the bandwidth efficiency of the system when multipath channel is involved. In this paper, we present a decoupled maximum likelihood blind estimation method, which doesn't rely on the structure of CP. This method is suboptimum. However, it is shown that the performance of the proposed method is better than the existing blind carrier offset estimation methods. This method works well ei en if the SNR is very low.

Original language	English
Title of host publication	VTC2004-FALL: 2004 IEEE 60TH VEHICULAR TECHNOLOGY CONFERENCE, VOLS 1-7
Place of Publication	NEW YORK
Publisher	IEEE
Pages	507-510
Number of pages	4
ISBN (Print)	0-7803-8521-7
Publication status	Published - 2004
Event	60th IEEE Vehicular Technology Conference - Los Angeles, Canada Duration: 26 Sept 2004 → 29 Sept 2004

Conference

Conference	60th IEEE Vehicular Technology Conference
Country/Territory	Canada
Period	26/09/2004 → 29/09/2004

Keywords

FREQUENCY OFFSET
NOISE

Cite this

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title = "Decoupled maximum likelihood blind carrier offset estimator for OFDM systems",

abstract = "In orthogonal frequency division multiplexing (OFDM) communication systems, the loss of orthogonality between the sub-carriers due to carrier-frequency offset can degrade the performance of the system. It must be compensated before the discrete Fourier transform-based demodulation. The estimation procedure based on the traditional maximum likelihood (NIL) criterion usually relies on the excess cyclic prefix (CP) symbols of OFDM system, hence reduces the bandwidth efficiency of the system when multipath channel is involved. In this paper, we present a decoupled maximum likelihood blind estimation method, which doesn't rely on the structure of CP. This method is suboptimum. However, it is shown that the performance of the proposed method is better than the existing blind carrier offset estimation methods. This method works well ei en if the SNR is very low.",

keywords = "FREQUENCY OFFSET, NOISE",

author = "MM Lu and A Nallanathan and TT Tjhung",

year = "2004",

language = "English",

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pages = "507--510",

booktitle = "VTC2004-FALL: 2004 IEEE 60TH VEHICULAR TECHNOLOGY CONFERENCE, VOLS 1-7",

publisher = "IEEE",

note = "60th IEEE Vehicular Technology Conference ; Conference date: 26-09-2004 Through 29-09-2004",

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TY - CHAP

T1 - Decoupled maximum likelihood blind carrier offset estimator for OFDM systems

AU - Lu, MM

AU - Nallanathan, A

AU - Tjhung, TT

PY - 2004

Y1 - 2004

N2 - In orthogonal frequency division multiplexing (OFDM) communication systems, the loss of orthogonality between the sub-carriers due to carrier-frequency offset can degrade the performance of the system. It must be compensated before the discrete Fourier transform-based demodulation. The estimation procedure based on the traditional maximum likelihood (NIL) criterion usually relies on the excess cyclic prefix (CP) symbols of OFDM system, hence reduces the bandwidth efficiency of the system when multipath channel is involved. In this paper, we present a decoupled maximum likelihood blind estimation method, which doesn't rely on the structure of CP. This method is suboptimum. However, it is shown that the performance of the proposed method is better than the existing blind carrier offset estimation methods. This method works well ei en if the SNR is very low.

AB - In orthogonal frequency division multiplexing (OFDM) communication systems, the loss of orthogonality between the sub-carriers due to carrier-frequency offset can degrade the performance of the system. It must be compensated before the discrete Fourier transform-based demodulation. The estimation procedure based on the traditional maximum likelihood (NIL) criterion usually relies on the excess cyclic prefix (CP) symbols of OFDM system, hence reduces the bandwidth efficiency of the system when multipath channel is involved. In this paper, we present a decoupled maximum likelihood blind estimation method, which doesn't rely on the structure of CP. This method is suboptimum. However, it is shown that the performance of the proposed method is better than the existing blind carrier offset estimation methods. This method works well ei en if the SNR is very low.

KW - FREQUENCY OFFSET

KW - NOISE

M3 - Conference paper

SN - 0-7803-8521-7

SP - 507

EP - 510

BT - VTC2004-FALL: 2004 IEEE 60TH VEHICULAR TECHNOLOGY CONFERENCE, VOLS 1-7

PB - IEEE

CY - NEW YORK

T2 - 60th IEEE Vehicular Technology Conference

Y2 - 26 September 2004 through 29 September 2004

ER -

Decoupled maximum likelihood blind carrier offset estimator for OFDM systems

Abstract

Conference

Keywords

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