发明申请
- 专利标题: FREQUENCY OFFSET ESTIMATION APPARATUS, FREQUENCY OFFSET ESTIMATION METHOD, AND RECEPTION METHOD
- 专利标题(中): 频率偏移估计装置,频率偏移估计方法和接收方法
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申请号: US13701963申请日: 2011-06-17
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公开(公告)号: US20130070874A1公开(公告)日: 2013-03-21
- 发明人: Tadao Nakagawa , Munehiro Matsui , Koichi Ishihara , Riichi Kudo , Takayuki Kobayashi , Etsushi Yamazaki , Akihide Sano , Eiji Yoshida , Masato Mizoguchi , Yutaka Miyamoto , Yasushi Takatori
- 申请人: Tadao Nakagawa , Munehiro Matsui , Koichi Ishihara , Riichi Kudo , Takayuki Kobayashi , Etsushi Yamazaki , Akihide Sano , Eiji Yoshida , Masato Mizoguchi , Yutaka Miyamoto , Yasushi Takatori
- 申请人地址: JP Tokyo
- 专利权人: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
- 当前专利权人: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
- 当前专利权人地址: JP Tokyo
- 优先权: JP2010-138402 20100617; JP2010-251868 20101110
- 国际申请: PCT/JP2011/063903 WO 20110617
- 主分类号: H04L27/14
- IPC分类号: H04L27/14
摘要:
Provided is a frequency offset estimation apparatus that appropriately estimates and compensates for a frequency offset of a received signal when estimating the frequency offset which is the difference between a carrier frequency of the received signal and the frequency of an output signal of a local oscillator. The frequency offset estimation apparatus converts the received signal sampled in advance with a predetermined sampling frequency into a frequency spectrum having N frequency components, limits a frequency band of negative frequency components from 1 to N/2 of the frequency spectrum and a frequency band of positive frequency components from N/2+1 to N of the frequency spectrum, calculates the sum of the squares of the positive frequency components of the frequency spectrum that have been subjected to frequency band limitation and the sum of the squares of the negative frequency components of the frequency spectrum that have been subjected to frequency band limitation to calculate power of the positive frequency components and power of the negative frequency components, and cyclically shifts all frequency components of the frequency spectrum in a frequency domain until the absolute value of a power difference between the power of the positive frequency components and the power of the negative frequency components is less than or equal to a predetermined threshold value, and estimates the frequency offset based on a shift amount until the absolute value is less than or equal to the threshold value.
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