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Power Level Control in TDMA Satellite Communication System

IP.com Disclosure Number: IPCOM000086315D
Original Publication Date: 1976-Aug-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Shulman, ML: AUTHOR [+2]

Abstract

Reception and transmission power levels of stations in a TDMA (Time Division Multiple Access) satellite communication network can be automatically regulated by digital computer control. The computer, which can also be used for other common control functions within the station and network, can be fed digitized samples of average transmitted and received burst power and process the samples to determine gain correction functions. The latter can be converted to correction signals for controlling the gains of automatic gain control (AGC) amplifier sections in transmission and reception circuits of the station.

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Power Level Control in TDMA Satellite Communication System

Reception and transmission power levels of stations in a TDMA (Time Division Multiple Access) satellite communication network can be automatically regulated by digital computer control. The computer, which can also be used for other common control functions within the station and network, can be fed digitized samples of average transmitted and received burst power and process the samples to determine gain correction functions. The latter can be converted to correction signals for controlling the gains of automatic gain control (AGC) amplifier sections in transmission and reception circuits of the station.

The transmission configuration is indicated in Fig. 1 and the reception configuration is indicated in Fig. 2. For stations other than the first station on the air, the computer starts the AGC reception gain at a low setting and increases it step-by-step until bursts of other stations are detected by the power detector. Thereafter, the receive gain is adjusted to the correct point for proper reception operation and regulated by periodic sampling and computer-controlled readjustment.

On the transmit side the AGC gain is progressively increased from a low setting. While the receive side gain control is locked at a particular setting. Transmission and reception gain levels are compared until a deviation from linearity is noted, and thereafter the receive and transmit power is computer regulated for proper tr...