Title:
無線通信システムにおける搬送波周波数オフセットの推定
Document Type and Number:
Japanese Patent JP2006516071
Kind Code:
A
Abstract:
An OFDM receiver includes a demodulator for receiving a passband signal having multiple symbols, one or more of the symbols being a reference symbol, and for converting the passband signal to a baseband signal, a CFO compensation circuit for receiving the baseband signal and modifying a phase of the baseband signal in response to a first control signal, a transformation circuit for translating the baseband signal from the CFO compensation circuit into a frequency domain constellation, an equalizer for receiving the frequency domain constellation and modifying the frequency domain constellation based at least in part on the reference symbol, and a CFO estimation circuit coupled between an output of the equalizer and the CFO compensation circuit in a feedback configuration. The CFO estimation circuit is capable of measuring a difference in phase error between multiple symbols received from the equalizer and generating the first control signal, which is representative of the measured phase error difference.
Inventors:
Bannersia, Raja
Application Number:
JP2004526227A
Publication Date:
June 15, 2006
Filing Date:
July 29, 2003
Export Citation:
Assignee:
Agia Systems Incorporated
International Classes:
H04J11/00; H04L27/26; H04L25/03
Domestic Patent References:
| JPH08265293A | 1996-10-11 | |||
| JPH10276166A | 1998-10-13 | |||
| JPH08265288A | 1996-10-11 | |||
| JP2001308821A | 2001-11-02 |
Attorney, Agent or Firm:
Masao Okabe
Nobuaki Kato
Kazuo
Okabe
Shinichi Usui
Takao Ochi
Teruhisa Motomiya
Asahi Shinmitsu
Katsumi Miyama
Nobuaki Kato
Kazuo
Okabe
Shinichi Usui
Takao Ochi
Teruhisa Motomiya
Asahi Shinmitsu
Katsumi Miyama