Method and device for estimating phase error

Details Method and device for estimating phase error Method and device for estimating phase error

1994-10-14

1996-04-02

Grimm, Siegfried H.

Demodulators

Phase shift keying or quadrature amplitude demodulator

375324, 375329, H04L 2722

Patent

active

055044530

ABSTRACT:
A method and apparatus for use in estimating phase error in a phase-modulated carrier. The method and apparatus of the present invention may be embodied in a phase-error-estimator circuit which is typically incorporated into a demodulator of a digital communications receiver. In general, the phase-error-estimator circuit receives the I and Q components of a phase-modulated signal, and outputs an estimate of the phase error, if any, in the phase-modulated carrier signal associated with the received I and Q. Preferably, the phase-error-estimator circuit includes an index/polarity generator circuit coupled to a look-up table. The index/polarity generator receives I and Q and maps them onto a reduced range of phase angles represented by values X and Y. X and Y are fed to a reduced and substantially triangular look-up table which outputs the stored phase-error-estimate for the particular X and Y inputs.

REFERENCES:
patent: 4796188 (1989-01-01), Gale et al.

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