Up-link power control in satellite communications system
First Claim
1. An up-link power control system in a satellite communication system having a plurality of earth stations, including at least one reference earth station, and at least one satellite for relaying signals among the earth stations, said up-link power control system comprising:
- transmission power control means for controlling transmission power of a reference signal of said reference earth station so that a level of a received reference signal at the satellite is constant;
each of the earth stations, except the reference earth station, having level difference detecting means for detecting the received level difference between a level of said received reference signal from the reference earth station through the satellite, and a level of a received signal which is sent from each earth station back to itself relayed by the satellite; and
each of the earth stations, except the reference earth station, controlling its own transmission power depending upon said difference.
1 Assignment
0 Petitions
Accused Products
Abstract
An up-link power from an earth station in a satellite communication system is controlled to compensate rain attenuation caused in an up-link so that the transmission power of the earth station is adjusted according to the difference between the level of a received reference signal, which is sent from a reference earth station to the satellite, and the level of its own received signal which is transmitted to the satellite from itself and is received at its own station after being relayed by the satellite. A transmission power of the reference earth station is adjusted so that the level of the received reference signal at the satellite is constant.
77 Citations
12 Claims
-
1. An up-link power control system in a satellite communication system having a plurality of earth stations, including at least one reference earth station, and at least one satellite for relaying signals among the earth stations, said up-link power control system comprising:
-
transmission power control means for controlling transmission power of a reference signal of said reference earth station so that a level of a received reference signal at the satellite is constant; each of the earth stations, except the reference earth station, having level difference detecting means for detecting the received level difference between a level of said received reference signal from the reference earth station through the satellite, and a level of a received signal which is sent from each earth station back to itself relayed by the satellite; and each of the earth stations, except the reference earth station, controlling its own transmission power depending upon said difference. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
Specification