Demodulator for demodulating digital modulated signals

Details Demodulator for demodulating digital modulated signals Demodulator for demodulating digital modulated signals

2006-05-16

2006-05-16

Chin, Stephen (Department: 2634)

Pulse or digital communications

Receivers

Angle modulation

C375S324000, C375S325000, C375S213000

Reexamination Certificate

active

07046743

ABSTRACT:
A differential detector produces, for each symbol, a phase difference between received phase information and one-symbol-delayed phase information, and delivers the phase difference to a differential circuit and a phase corrector. Another differential detector produces, for each symbol, a phase difference between the one-symbol-delayed phase information and two-symbol-delayed phase information of the received phase information. The differential circuit produces, for each symbol, phase-difference difference information from a difference between both the phase differences. A phase error detector obtains a phase error caused by a difference in the carrier frequency between a sending and a receiving digital radio apparatus, based on the phase-difference difference information and either of both phase differences. A phase corrector subtracts the phase error from the phase difference.

REFERENCES:
patent: 5097220 (1992-03-01), Shimakata et al.
patent: 5412694 (1995-05-01), Sato et al.
patent: 5757862 (1998-05-01), Ishizu

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