Robust Frequency Offset Estimation in the Presence of Time-Varying DC Offset
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概要
- 論文の詳細を見る
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.
- （社）電子情報通信学会の論文
- 2009-08-01
著者
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YUNUS Umut
Department of Electrical and Information Systems, Osaka Prefecture University
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LIN Hai
Department of Electrical and Information Systems, Osaka Prefecture University
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YAMASHITA Katsumi
Department of Electrical and Information Systems, Osaka Prefecture University
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Yamashita Katsumi
Department Of Electrical And Information Systems Osaka Prefecture University
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Yunus Umut
Department Of Electrical And Information Systems Osaka Prefecture University
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Lin Hai
Department Of Electrical And Information Systems Osaka Prefecture University
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Yamashita Katsumi
Intelligent Information & Communication Laboratory In Department Of Electrical & Electronic
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