Automatic gain control

Details Automatic gain control Automatic gain control

1990-11-21

1991-09-17

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

455245, 455249, H04L 2708

Patent

active

050501925

ABSTRACT:
An automatic gain control (AGC) for a demodulator which receives digitally modulated burst signals time-serially from a plurality of terminals. The AGC has a series connection of a variable attenuator and a limiter that precedes a demodulator. The variable attenuator is controlled such that when a burst signal is absent, the noise power level inputted to the limiter coincides with a predetermined reference value, whereby when burst signal is present, the limiter controls the burst signal to a predetermined level. As a result, when burst signals greatly differ in level from one another, they are controlled to the predetermined level in their preamble word portions. This insures stable demodulation of data signals.

REFERENCES:
patent: 3958213 (1976-05-01), Scott et al.
patent: 4546326 (1985-10-01), Van Uffelen et al.
patent: 4625240 (1986-11-01), Yablonski et al.
patent: 4829593 (1989-05-01), Hara
patent: 4852126 (1989-07-01), Tanaka et al.
patent: 4864244 (1989-09-01), Sasaki
patent: 4989074 (1991-01-01), Matsumoto
P. Bylanski and D. G. W. Ingram, "Digital Transmission Systems", published by Peter Peregrinus Ltd., reprinted 1987, pp. 381-385.

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