Demodulating device, broadcasting system, and semiconductor...

Details Demodulating device, broadcasting system, and semiconductor... Demodulating device, broadcasting system, and semiconductor...

2005-09-06

2005-09-06

Le, Amanda T. (Department: 2634)

Pulse or digital communications

Receivers

Angle modulation

C375S327000, C375S376000, C331S025000, C329S307000

Reexamination Certificate

active

06940923

ABSTRACT:
A demodulating device capable of high-efficiency, high-accuracy phase noise correction control and improved in quality and reliability. A digital signal generating portion synchronously detects a modulated input signal and subjects the signal to A/D conversion to generate digital signals corresponding to phase axes. A timing recovery portion extracts symbol timing of the digital signals to recover timing. A carrier recovery portion sets a gain for a phase difference between the timing-recovered digital signals in accordance with a phase noise correction signal, and rotates symbols in a direction to suppress phase noise in accordance with an oscillation signal generated based on the gain, to recover carrier. A phase noise correction portion outputs the phase noise correction signal which takes a value equal to an increase of the phase difference when the phase difference has increased on the positive side, and which takes a value obtained by multiplying an increase of the phase difference by “−1” when the phase difference has increased on the negative side.

REFERENCES:
patent: 5471508 (1995-11-01), Koslov
patent: 6751270 (2004-06-01), Choi et al.
patent: 6826238 (2004-11-01), Ahn
patent: 2002/0071502 (2002-06-01), Chan et al.
Patent Abstracts of Japan, 2000-324192, Nov. 24, 2000.

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