Telecommunications – Carrier wave repeater or relay system – Portable or mobile repeater
Patent
1977-12-15
1981-04-07
Safourek, Benedict V.
Telecommunications
Carrier wave repeater or relay system
Portable or mobile repeater
455 69, 343100ST, 371 37, 370110, H04B 720, H04L 110
Patent
active
042610540
ABSTRACT:
An adaptive transmitter power control for use in satellite communications systems. The power control provides real-time adjustment of satellite transponder power on the basis of received signal quality so as to overcome the effects of rapid onset signal attenuation occurring within the system, such as would be caused by a rainstorm. The communication system includes at least two ground stations communicating with one another via a satellite transponder whose power output is functionally dependent upon received signal strength. The level of transmitter power utilized by the satellite is adjusted by adjusting the power level of the signal transmitted to the satellite by at least one of the ground stations. At least another of the ground stations includes a quality monitor which responds to soft decisions generated by the ground station in demodulating the signal received from the power controlled ground station via the satellite repeater. The quality monitor makes a real-time determination of the quality of the received signal on the basis of the magnitude of these soft decisions. Transmitter power adjustment commands are generated in accordance with this determination. In systems wherein the primary data communicated between the stations is encoded in an error-correcting code, the power adjustment commands are communicated to the power controlled ground station by intentionally inserting errors in the error-correcting coded data.
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Harris Corporation
Safourek Benedict V.
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