Circuit for detecting the locked condition of PSK or QAM

Details Circuit for detecting the locked condition of PSK or QAM Circuit for detecting the locked condition of PSK or QAM

1997-12-02

1999-01-19

Grimm, Siegfried H.

Demodulators

Phase shift keying or quadrature amplitude demodulator

329308, 331DIG2, 375327, 375329, H04L 2722

Patent

active

058617736

ABSTRACT:
A method for detecting a locked condition of a demodulator of at least one signal that may have discrete levels defining a constellation of nominal points in a plane. The method includes the steps of defining reference areas about the nominal points, a reference area being separated from another by a band or an angular sector crossing the origin of the constellation plane, and indicating a locked condition if the ratio of points occurring in the reference areas is above the probability for points to occur in the reference area, when the demodulator is wrongly adjusted.

REFERENCES:
patent: 4057762 (1977-11-01), Namiki
patent: 4736386 (1988-04-01), Nichols
patent: 4853642 (1989-08-01), Otani et al.
patent: 4870382 (1989-09-01), Keate et al.
patent: 4958360 (1990-09-01), Sari
patent: 4987375 (1991-01-01), Wu et al.
patent: 5121071 (1992-06-01), Kelly et al.
IEEE Transactions on Communication, vol. 30, No. 10, Oct. 1982 New York, US, pp. 2385-2390, Yoshio Matsuo & Junji Namiki, "Carrier Recovery Systems For Arbitrarily Mapped APK Signals".

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