Automatic gain control circuit in multi-direction time division

Details Automatic gain control circuit in multi-direction time division Automatic gain control circuit in multi-direction time division

1979-09-19

1982-05-18

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 97, 370 77, H02K 4704

Patent

active

043308597

ABSTRACT:
The invention is primarily--although not exclusively--directed to an earth-to-satellite communication system using time division multiplex over a common frequency. An automatic gain control circuit in a receiver unit of the ground or central station receives burst signals transmitted in time slots individually assigned to a plurality of satellite stations. The satellite stations are dispersed in multiple directions, which means that the burst signals which they transmit are not received by the central station with the same amplitude. The inventive automatic gain control circuit causes all of the burst signals to achieve a uniform amplitude within the central station. First, the receiver separates and feeds back the various burst signals into a plurality of individually associated branches. Equipment in the separate branches amplifies the individual feedback signals, using low band-pass amplifiers, and then compounds them into a single gain control signal. These control signals adjust the gains of the individual burst signals. The advantage is that the gain may stabilize on individual time slot pulses without a destabilizing effect from grossly different amplitudes of pulses received during intermediate time slots.

REFERENCES:
patent: 3400223 (1968-09-01), Peorotti
patent: 3423682 (1969-01-01), Cauchois
patent: 3495244 (1970-02-01), LaRosa
patent: 3649766 (1972-03-01), LaMarche
patent: 4009350 (1977-02-01), Cabet
patent: 4121055 (1978-10-01), Doherty

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