Carrier reproducing circuit including region deciding circuitry

Details Carrier reproducing circuit including region deciding circuitry Carrier reproducing circuit including region deciding circuitry

1996-09-05

1999-02-16

Vo, Don N.

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

375326, 375327, 375328, 375344, 331 12, 329304, H04L 512, H04L 2302

Patent

active

058728120

ABSTRACT:
A carrier reproducing circuit for detecting a phase error when an inputted baseband signal is out of phase and bringing the baseband signal into phase even in QAM systems in which normal signal points are located in a non-square pattern in a phase-amplitude signal space. When the baseband signal is out of phase, a first region decision circuit detects a presence of the baseband signal in a first region and outputs a first signal, and a second region decision circuit detects a presence of the baseband signal in a second region and outputs a second signal. If the second signal is not outputted over a predetermined period of time around the time at which the first signal is outputted, then a selective outputting circuit outputs a phase error detected by a phase error decision circuit with respect to the baseband signal at the time the first signal is outputted, to a control signal generator. If the second signal is outputted in the predetermined period of time, then the selective outputting circuit outputs the phase error detected by the phase error decision circuit with respect to the baseband signal at the time the first signal is outputted in a preceding cycle to the control signal generator.

REFERENCES:
patent: 5519733 (1996-05-01), Huang
patent: 5594389 (1997-01-01), Kiyanagi et al.
patent: 5594759 (1997-01-01), Iwamatsu
patent: 5596605 (1997-01-01), Kiyanagi et al.

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