Apparatus and methods for power control in satellite communications systems with satellite-linked terrestrial stations
First Claim
1. A method of operating a satellite wireless communications system including a satellite configured to communicate with terminals directly and to communicate with terminals indirectly via a base station, the method comprising:
- providing a first signal power control loop that controls transmitted signal power through a first communication link between the base station and a terminal;
providing a second signal power control loop that controls transmitted signal power through a combination of the first communication link and a second communication link between the base station and the satellite concurrent with provision of the first signal power control loop; and
wherein the second signal power control loop includes the base station controlling transmitted signal power for the first communication link using a first output of a second demodulator to control an output level of a first power amplifier and using a second output of the second demodulator to generate first power control information that is transmitted with first information to the terminal, and controlling a transmitted signal power of the second communication link using a first output of a first demodulator to control an output level of a second power amplifier and using a second output of the first demodulator to generate second power control information that is transmitted with second information to the satellite.
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Accused Products
Abstract
A signal power control loop is provided for a link between a terrestrial station and a terminal when the terminal and a satellite are linked via the terrestrial station. The signal power control loop may control transmitted signal power of the terminal and/or the terrestrial station. In some embodiments, the signal power control loop controls transmitted signal power of the terminal and/or the terrestrial station independent of signal power control for a link between the terrestrial station and the satellite.
267 Citations
19 Claims
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1. A method of operating a satellite wireless communications system including a satellite configured to communicate with terminals directly and to communicate with terminals indirectly via a base station, the method comprising:
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providing a first signal power control loop that controls transmitted signal power through a first communication link between the base station and a terminal; providing a second signal power control loop that controls transmitted signal power through a combination of the first communication link and a second communication link between the base station and the satellite concurrent with provision of the first signal power control loop; and wherein the second signal power control loop includes the base station controlling transmitted signal power for the first communication link using a first output of a second demodulator to control an output level of a first power amplifier and using a second output of the second demodulator to generate first power control information that is transmitted with first information to the terminal, and controlling a transmitted signal power of the second communication link using a first output of a first demodulator to control an output level of a second power amplifier and using a second output of the first demodulator to generate second power control information that is transmitted with second information to the satellite. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A wireless communications system comprising:
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a satellite configured to communicate with terminals directly and to communicate with terminals indirectly via a base station; a first signal power control loop that controls transmitted signal power through a first communication link between the base station and a terminal when the terminal and the satellite are linked via the base station; a second signal power control loop that controls transmitted signal power through a combination of the first communication link and a second communication link between the base station and the satellite concurrent with the first signal power control loop; a third signal power control loop that controls transmitted signal power through a third communication link between the terminal and the satellite when the terminal is in direct communication with the satellite; and wherein the second signal power control loop includes a satellite link power control loop that controls transmitted signal power for the second communication link using a first output of a second demodulator, which is at the base station and converts first information received from the satellite to a format suitable for remodulation and transmission to the terminal, to control an output level of a second power amplifier, which is at the base station and amplifies remodulated second information for transmission to the satellite, and using a second output of the second demodulator to generate second power control information that is transmitted with the remodulated second information to the satellite. - View Dependent Claims (18, 19)
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Specification