System for receiving a phase and amplitude modulated digital sig

Details System for receiving a phase and amplitude modulated digital sig System for receiving a phase and amplitude modulated digital sig

1994-06-16

1996-07-02

Chin, Stephen

Pulse or digital communications

Equalizers

375266, 375326, 375350, 332103, H03H 730, H03H 740, H03K 5159, H04L 2714

Patent

active

055330509

ABSTRACT:
A system for receiving a complex modulation digital signal using a temporal equaliser including an estimator supplying correction parameters. This system includes: at least one peripheral control loop, the estimator of which uses at least one of said correction parameters, the peripheral control loop having an operating range separate from that of the temporal equalizer; and a temporal discriminator detecting inactive areas of the estimator of each peripheral control loop to enable operation of the temporal equalizer in such a way as to prevent interaction between the temporal equalizer and the peripheral control loop. The peripheral control loop can be a Mueller and Muller-type pointing estimator and/or a Leclert and Vandamme-type carrier recovery device.

REFERENCES:
patent: 3962637 (1976-06-01), Motley et al.
patent: 5276711 (1994-01-01), Rossi
patent: 5412693 (1995-05-01), Bolla et al.
Jablon, "Joint Blind Equalization, Carrier Recovery and Timing Recovery for High-Order QAM Signal Constellations", IEEE Transaction of Signal Processing, vol. 40, No. 6, Jun. 1992, pp. 1383-1397.
Mueller & Muller, "Timing Recovery in Digital Synchronous Data Receivers", IEEE Transactions on Communications, vol. 24, No. 5, 1976, pp. 516-531.

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