IEICE TRANSACTIONS on Communications
Robust Frequency Offset Estimation in the Presence of Time-Varying DC Offset
Summary :
In OFDM systems, the estimation/correction of carrier frequency offset (CFO) is crucial to maintain orthogonality among subcarriers. However, the CFO estimation suffers from DC offset (DCO) generated in low-cost direct-conversion receivers (DCRs). More seriously, in practice, DCO is time-varying due to the automatic gain control. In this paper, a novel CFO estimator in the presence of time-varying DCO is proposed. It is shown the residual DCO after high-pass filtering varies in a linear fashion. Based on this observation and the periodicity of the training sequence, we derive a CFO estimator independent of DCO. Also, the residual DCO can be estimated, using the obtained CFO. The validity of the proposed estimation method is demonstrated by simulations.
- Publication
- IEICE TRANSACTIONS on Communications Vol.E92-B No.8 pp.2577-2583
- Publication Date
- 2009/08/01
- Publicized
- Online ISSN
- 1745-1345
- DOI
- 10.1587/transcom.E92.B.2577
- Type of Manuscript
- PAPER
- Category
- Transmission Systems and Transmission Equipment for Communications
Authors
Keyword
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Umut YUNUS, Hai LIN, Katsumi YAMASHITA, "Robust Frequency Offset Estimation in the Presence of Time-Varying DC Offset" in IEICE TRANSACTIONS on Communications,
vol. E92-B, no. 8, pp. 2577-2583, August 2009, doi: 10.1587/transcom.E92.B.2577.
Abstract: In OFDM systems, the estimation/correction of carrier frequency offset (CFO) is crucial to maintain orthogonality among subcarriers. However, the CFO estimation suffers from DC offset (DCO) generated in low-cost direct-conversion receivers (DCRs). More seriously, in practice, DCO is time-varying due to the automatic gain control. In this paper, a novel CFO estimator in the presence of time-varying DCO is proposed. It is shown the residual DCO after high-pass filtering varies in a linear fashion. Based on this observation and the periodicity of the training sequence, we derive a CFO estimator independent of DCO. Also, the residual DCO can be estimated, using the obtained CFO. The validity of the proposed estimation method is demonstrated by simulations.
URL: https://global.ieice.org/en_transactions/communications/10.1587/transcom.E92.B.2577/_p
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@ARTICLE{e92-b_8_2577,
author={Umut YUNUS, Hai LIN, Katsumi YAMASHITA, },
journal={IEICE TRANSACTIONS on Communications},
title={Robust Frequency Offset Estimation in the Presence of Time-Varying DC Offset},
year={2009},
volume={E92-B},
number={8},
pages={2577-2583},
abstract={In OFDM systems, the estimation/correction of carrier frequency offset (CFO) is crucial to maintain orthogonality among subcarriers. However, the CFO estimation suffers from DC offset (DCO) generated in low-cost direct-conversion receivers (DCRs). More seriously, in practice, DCO is time-varying due to the automatic gain control. In this paper, a novel CFO estimator in the presence of time-varying DCO is proposed. It is shown the residual DCO after high-pass filtering varies in a linear fashion. Based on this observation and the periodicity of the training sequence, we derive a CFO estimator independent of DCO. Also, the residual DCO can be estimated, using the obtained CFO. The validity of the proposed estimation method is demonstrated by simulations.},
keywords={},
doi={10.1587/transcom.E92.B.2577},
ISSN={1745-1345},
month={August},}
Copy
TY - JOUR
TI - Robust Frequency Offset Estimation in the Presence of Time-Varying DC Offset
T2 - IEICE TRANSACTIONS on Communications
SP - 2577
EP - 2583
AU - Umut YUNUS
AU - Hai LIN
AU - Katsumi YAMASHITA
PY - 2009
DO - 10.1587/transcom.E92.B.2577
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E92-B
IS - 8
JA - IEICE TRANSACTIONS on Communications
Y1 - August 2009
AB - In OFDM systems, the estimation/correction of carrier frequency offset (CFO) is crucial to maintain orthogonality among subcarriers. However, the CFO estimation suffers from DC offset (DCO) generated in low-cost direct-conversion receivers (DCRs). More seriously, in practice, DCO is time-varying due to the automatic gain control. In this paper, a novel CFO estimator in the presence of time-varying DCO is proposed. It is shown the residual DCO after high-pass filtering varies in a linear fashion. Based on this observation and the periodicity of the training sequence, we derive a CFO estimator independent of DCO. Also, the residual DCO can be estimated, using the obtained CFO. The validity of the proposed estimation method is demonstrated by simulations.
ER -
English
