Carrier frequency estimator for a signal receiver

Details Carrier frequency estimator for a signal receiver Carrier frequency estimator for a signal receiver

1998-07-20

1999-12-14

Vo, Don N.

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

375326, 329304, H04L 512, H04L 2302

Patent

active

060027215

ABSTRACT:
A method and apparatus for estimating a carrier frequency of an incoming signal. The carrier frequency estimator determines the phase difference between the phases for two successive modulation symbols when the two successive modulation symbols are within a particular magnitude range having at least two evenly spaced modulation phase states. The carrier frequency estimator includes a magnitude selector for selecting modulation symbols within the particular magnitude range and a phase subtractor coupled to the magnitude selector for determining phase differences between the successive modulation symbol phases. A signal receiver of the present invention uses the phase differences for tuning a locally generated frequency for tracking a carrier frequency of an incoming radio frequency (RF) signal.

REFERENCES:
patent: 4608703 (1986-08-01), Kaga et al.
patent: 4847864 (1989-07-01), Cupo
patent: 4866395 (1989-09-01), Hostetter
patent: 4961206 (1990-10-01), Tomlinson et al.
patent: 5315619 (1994-05-01), Bhat

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