Circuit for detecting a shifted frequency, a method for...

Details Circuit for detecting a shifted frequency, a method for... Circuit for detecting a shifted frequency, a method for...

2007-09-25

2007-09-25

Phu, Phuong (Department: 2611)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S144000, C375S347000, C375S349000

Reexamination Certificate

active

10696055

ABSTRACT:
A Doppler frequency is detected with a high degree of accuracy, deterioration of a transmission diversity effect is prevented, and a good reception property is secured. A reception demodulating unit of a portable communication apparatus according to the present invention has a path search and path selection unit for searching and selecting an optimum path, finger processing units for obtaining a phase variation component as a channel estimated value for each path and coherent-detecting by using its channel estimated value and a phase difference measuring unit for measuring a phase difference, a path timing difference measuring unit for measuring a periodical path timing difference, a frequency error detecting unit for detecting a frequency error of a signal by using a path timing difference and a phase difference, and a Doppler frequency detecting unit for detecting a Doppler frequency on the basis of a frequency error.

REFERENCES:
patent: 6658045 (2003-12-01), Jin
patent: 6704552 (2004-03-01), Matsumoto
patent: 7054352 (2006-05-01), Hasegawa
patent: 2004/0013169 (2004-01-01), Kanemoto et al.
patent: 2001 86031 (2001-03-01), None
patent: WO 01 59937 (2001-08-01), None
Li Yan et al “Automatic frequency correction scheme for spread spectrum coherent RAKE receiver” Apr. 30, 1998, Electronics Letters, IEE Stevenage, GB, pp. 844-845, XP006009687 ISSN: 0013-5194.

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