Title:
DEMODULATOR
Document Type and Number:
Japanese Patent JP3555843
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To improve deterioration in the characteristics of a carrier added by a local signal used by a frequency conversion circuit of an OFDM demodulator onto a phase noise.
SOLUTION: The demodulator is provided with a phase error detection circuit 11, which uses the phase error information for each sub carrier from a sub carrier demodulation circuit 10 and the amplitude distortion information of each sub carrier from a propagation path distortion estimate circuit 8 to generate phase error information so as to correct a propagation path distortion compensation coefficient, thereby compensating the phase noise. Furthermore, a moving mean circuit applies moving mean processing to the mean results in an OFDM symbol over a required number of symbols so as to increase the detection accuracy of the phase error.
Inventors:
Takeshi Yamamoto
Kazuhiro Okanoue
Tomoki Osawa
Tomoaki Kumagai
Kazuhiro Okanoue
Tomoki Osawa
Tomoaki Kumagai
Application Number:
JP9240799A
Publication Date:
August 18, 2004
Filing Date:
March 31, 1999
Export Citation:
Assignee:
NEC
Nippon Telegraph and Telephone Corporation
Nippon Telegraph and Telephone Corporation
International Classes:
H04J11/00; H04B1/10; H04B7/005; (IPC1-7): H04J11/00; H04B1/10; H04B7/005
Domestic Patent References:
| JP10224413A | ||||
| JP10200500A |
Foreign References:
| WO1996019056A1 |
Other References:
花田 由紀子 外3名,「OFDM/DS-CDMAパケット無線アクセスにおけるパイロット同期検波」,1999年電子情報通信学会総合大会講演論文集,1999年 3月 8日,通信1,p.369,B-5-18
Attorney, Agent or Firm:
Naotaka Ide
Toshinao Shimodaira
Toshinao Shimodaira