대한전기학회:학술대회논문집 (Proceedings of the KIEE Conference)
- 대한전기학회 2000년도 하계학술대회 논문집 D
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- Pages.3100-3102
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- 2000
OFDM 수신기를 위한 강인한 주파수 옵셋 보정 기법
A robust frequency offset estimation scheme for an OFDM system
- Wui, Jung-Hwa (Myongji Univ.) ;
- Hwang, Hu-Mor (Myongji Univ.) ;
- Song, Jin-Ho (Sejong Eng. co.)
- 발행 : 2000.07.17
초록
In this paper, we propose to a robust frequency offset estimation method of OFDM signals. A carrier frequency offset may be decomposed into an integer multiple of the subcarrier spacing and a residual frequency offset. Fractional part of frequency offset is obtained by using the maximum likelihood estimation(MLE) method. And we use the correlation of the samples at the output of the discrete Fourier transform(DFT) to estimate integer part of frequency offset. The result shows that the estimation frequency offset is almost linear to frequency offset. We propose to an improved estimation error variance of the carrier frequency offset estimation. The proposed estimator has better performance than the conventional ones in terms of error variance and tracking range.
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