Method of servo-controlling the parameters of a modulator having

Details Method of servo-controlling the parameters of a modulator having Method of servo-controlling the parameters of a modulator having

1990-01-18

1991-10-01

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

332103, 332107, 375 39, H03C 106

Patent

active

050540378

ABSTRACT:
Servo-controlling position in a modulator having 2.sup.n phase and amplitude states (used for e.g. 16-QAM radio beam transmission) is achieved by monitoring the amplitude of the signal output from the modulator. In a first or inner loop, any constellation centering error in the modulation states is corrected; in a second or middle loop, any quadrature error between the modulated carriers is corrected; and in a third or outer loop, any amplitude difference between the X and Y channels input to the modulator is corrected.

REFERENCES:
patent: 4291277 (1981-09-01), Davis et al.
patent: 4462001 (1984-07-01), Girard
patent: 4908840 (1980-03-01), Kakimoto
patent: 4930141 (1990-05-01), Ohmagari
Brown et al.: "Fault Detection in Digital Microwave Radio Equipment"; IEEE J. Selected Areas in Communications, vol. 6, No. 5 (Jun. 1988) pp. 819-827.

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