1976-02-17
1977-07-26
Safourek, Benedict V.
325 62, H04B 700
Patent
active
040386007
ABSTRACT:
A system for controlling the output power of a transmitter which communicates with a remotely positioned receiving station through a "linear" transponder such that the power level of the input signal to the transponder is substantially constant is disclosed. The output signal of the transmitter and the input signal to the transponder includes two carriers having predetermined relative power levels with respect to each other. Typically, one carrier will be 10 dB below the other. Since all linear transponders are slightly non-linear, intermodulation distortion products are generated by the transponder. The intermodulation products and the two carriers are retransmitted to the receiving station by the transponder. The power level of the intermodulation distortion products relative to the low power carrier is measured at the receiving station. From the power level of the intermodulation distortion products and the intermodulation distortion characteristics of the transponder, the power level of the input signal arriving at the transponder is determined and a signal generated to control the power output of the transmitter so that the input signal arriving at the transponder has the desired power level. The carrier having the highest power level is modulated with the data to be transmitted using any convenient modulation technique. The low power carrier is not normally modulated. Its only purpose is to generate the intermodulation products which are used to determine the power level of the input signal to the transponder.
REFERENCES:
patent: 2885470 (1959-05-01), Bartelink
patent: 3315164 (1967-04-01), Ferguson, Jr. et al.
patent: 3487169 (1969-12-01), Miyagi
Hinson J. B.
Safourek Benedict V.
Westinghouse Electric Corporation
LandOfFree
Power control on satellite uplinks does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Power control on satellite uplinks, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Power control on satellite uplinks will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-728946