Joint Estimation of Carrier Frequency Offset and Channel and Symbol Timing for OFDM
Summary :
A method that jointly estimates the carrier frequency offset (CFO), channel and symbol timing for orthogonal frequency division multiplexing (OFDM) is proposed in this letter. Based on the characteristic of cyclic training symbols in the frequency domain, the joint estimation is divided into three separate estimations. The CFO and equivalent channel impulse response (CIR) are first estimated by an iterative joint maximum likelihood estimation (JMLE), then the symbol timing offset (STO) is obtained by the assistance of equivalent CIR, finally the CIR is calculated based on the equivalent CIR after known STO and CFO. In our proposed method, the effect of imperfect CIR is considered in the CFO estimator. Moveover, a procedure, which eliminates the inverse operation of a covariance matrix at each iterative process, was adopted to reduce the complexity of our proposed method. Simulations show that the proposed method is capable of retaining the same bit error rate as joint CFO and CIR maximum likelihood estimation without symbol timing error.
- Publication
- IEICE TRANSACTIONS on Communications Vol.E92-B No.6 pp.2247-2250
- Publication Date
- 2009/06/01
- Publicized
- Online ISSN
- 1745-1345
- DOI
- 10.1587/transcom.E92.B.2247
- Type of Manuscript
- LETTER
- Category
- Transmission Systems and Transmission Equipment for Communications
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Shaopeng WANG, Shihua ZHU, Yi LI, "Joint Estimation of Carrier Frequency Offset and Channel and Symbol Timing for OFDM" in IEICE TRANSACTIONS on Communications,
vol. E92-B, no. 6, pp. 2247-2250, June 2009, doi: 10.1587/transcom.E92.B.2247.
Abstract: A method that jointly estimates the carrier frequency offset (CFO), channel and symbol timing for orthogonal frequency division multiplexing (OFDM) is proposed in this letter. Based on the characteristic of cyclic training symbols in the frequency domain, the joint estimation is divided into three separate estimations. The CFO and equivalent channel impulse response (CIR) are first estimated by an iterative joint maximum likelihood estimation (JMLE), then the symbol timing offset (STO) is obtained by the assistance of equivalent CIR, finally the CIR is calculated based on the equivalent CIR after known STO and CFO. In our proposed method, the effect of imperfect CIR is considered in the CFO estimator. Moveover, a procedure, which eliminates the inverse operation of a covariance matrix at each iterative process, was adopted to reduce the complexity of our proposed method. Simulations show that the proposed method is capable of retaining the same bit error rate as joint CFO and CIR maximum likelihood estimation without symbol timing error.
URL: https://global.ieice.org/en_transactions/communications/10.1587/transcom.E92.B.2247/_p
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@ARTICLE{e92-b_6_2247,
author={Shaopeng WANG, Shihua ZHU, Yi LI, },
journal={IEICE TRANSACTIONS on Communications},
title={Joint Estimation of Carrier Frequency Offset and Channel and Symbol Timing for OFDM},
year={2009},
volume={E92-B},
number={6},
pages={2247-2250},
abstract={A method that jointly estimates the carrier frequency offset (CFO), channel and symbol timing for orthogonal frequency division multiplexing (OFDM) is proposed in this letter. Based on the characteristic of cyclic training symbols in the frequency domain, the joint estimation is divided into three separate estimations. The CFO and equivalent channel impulse response (CIR) are first estimated by an iterative joint maximum likelihood estimation (JMLE), then the symbol timing offset (STO) is obtained by the assistance of equivalent CIR, finally the CIR is calculated based on the equivalent CIR after known STO and CFO. In our proposed method, the effect of imperfect CIR is considered in the CFO estimator. Moveover, a procedure, which eliminates the inverse operation of a covariance matrix at each iterative process, was adopted to reduce the complexity of our proposed method. Simulations show that the proposed method is capable of retaining the same bit error rate as joint CFO and CIR maximum likelihood estimation without symbol timing error.},
keywords={},
doi={10.1587/transcom.E92.B.2247},
ISSN={1745-1345},
month={June},}
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TY - JOUR
TI - Joint Estimation of Carrier Frequency Offset and Channel and Symbol Timing for OFDM
T2 - IEICE TRANSACTIONS on Communications
SP - 2247
EP - 2250
AU - Shaopeng WANG
AU - Shihua ZHU
AU - Yi LI
PY - 2009
DO - 10.1587/transcom.E92.B.2247
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E92-B
IS - 6
JA - IEICE TRANSACTIONS on Communications
Y1 - June 2009
AB - A method that jointly estimates the carrier frequency offset (CFO), channel and symbol timing for orthogonal frequency division multiplexing (OFDM) is proposed in this letter. Based on the characteristic of cyclic training symbols in the frequency domain, the joint estimation is divided into three separate estimations. The CFO and equivalent channel impulse response (CIR) are first estimated by an iterative joint maximum likelihood estimation (JMLE), then the symbol timing offset (STO) is obtained by the assistance of equivalent CIR, finally the CIR is calculated based on the equivalent CIR after known STO and CFO. In our proposed method, the effect of imperfect CIR is considered in the CFO estimator. Moveover, a procedure, which eliminates the inverse operation of a covariance matrix at each iterative process, was adopted to reduce the complexity of our proposed method. Simulations show that the proposed method is capable of retaining the same bit error rate as joint CFO and CIR maximum likelihood estimation without symbol timing error.
ER -
English
