Pulse or digital communications – Synchronizers
Patent
1995-07-10
1997-11-04
Chin, Stephen
Pulse or digital communications
Synchronizers
375373, 375326, H04L 700, H03D 324
Patent
active
056848420
ABSTRACT:
A carrier recovery circuit includes a correction circuit for correcting phase differences which appear betwen a complex input signal and a local carrier supplied by a local oscillator. The correction circuit defines zones in a plane defined by in-phase components and quadrature components of the complex signal. Each zone includes a respective state of a constellation that is used for encoding the signal during transmission. When a point representing the signal in the I/Q plane is subjected to a decision, the correction circuit produces a correction signal proportional to a measured phase difference. When the point lies outside the zones, the correction circuit produces a correction signal that varies as a function of the measured phase difference to which a weighting factor, dependent on the distance from the point to the nearest zone, is applied. In a first mode the correction circuit corrects either the local oscillator phase or frequency; or in a second mode, corrects the signal phase.
REFERENCES:
patent: 4283682 (1981-08-01), Sifford et al.
patent: 4648100 (1987-03-01), Mardirosian
Chin Stephen
Phan Hai H.
Treacy David R.
U.S. Philips Corporation
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