System for phase error estimation for a quadrature modulator

Details System for phase error estimation for a quadrature modulator System for phase error estimation for a quadrature modulator

2006-02-14

2006-02-14

Tran, Khai (Department: 2637)

Pulse or digital communications

Receivers

Interference or noise reduction

C375S320000

Reexamination Certificate

active

06999536

ABSTRACT:
The present invention discloses a system and method of estimating phase error in a waveform sent from an analog transmitter. In a first technique, the ratio of the minimum to maximum envelope may be fit into a curve to determine the phase error of the waveform. In a second technique utilizing the maximum abscissa, the phase error estimate may be obtained utilizing an arctangent of an angle formed by a line from an origin through a point on the waveform at the index where the angle is equal to the phase error. A third technique for estimating phase error may involve determining an angle subtended by a line from an origin to an intersection and the closest axis, where the phase error estimate is twice the angle formed.

REFERENCES:
patent: 5504453 (1996-04-01), MacDonald et al.
patent: 6356599 (2002-03-01), Lee

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