Reducing phase noise in phase-encoded communications signals

Details Reducing phase noise in phase-encoded communications signals Reducing phase noise in phase-encoded communications signals

2007-05-08

2007-05-08

Payne, David C. (Department: 2611)

Pulse or digital communications

Equalizers

Automatic

C375S346000, C375S232000

Reexamination Certificate

active

10390525

ABSTRACT:
A receiver may reduce phase noise in phase-encoded communications signals using symmetrical averaging to estimate phase shift correction. In one embodiment, a receiver, such as a quadrature amplitude modulation receiver may include a decision feedback equalizer and a filter of low complexity to receive a phase modulated incoming signal. Using a combination of phase shift difference estimates prior and subsequent to a decision point for the received symbols, the filter may derive another estimate of the phase shift relative to the estimated phase shift by the equalizer.

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