Interference resistant satellite link power control using downlink beacon
First Claim
1. A method for determining effective isotropic radiated power (EIRP) of user terminals in a satellite communication system, the method comprising:
- obtaining a frequency gain measurement at each of a plurality of different frequencies at a gateway, the frequency gain measurement determined based on a difference between an input signal power and a measured signal power at the gateway for each of the plurality of different frequencies;
obtaining a path gain measurement for each of a plurality of different signal paths at the gateway, the path gain measurement determined based on a difference between an input signal power and a measured signal power at the gateway for each of the plurality of different signal paths;
obtaining a satellite beacon signal power measurement at a receiver of the gateway;
obtaining a clear sky satellite beacon signal power measurement at a receiver of the gateway;
determining a rain fade level on a return downlink between a satellite and the gateway based on a difference between the satellite beacon signal power measurement and the clear sky satellite beacon signal power measurement;
determining a target signal power at the gateway for one or more frequency channels, the target signal power based on the frequency gain measurement, the path gain measurement, and the rain fade level;
obtaining a message signal power at the gateway of a message from a user terminal; and
determining the EIRP of the user terminal based on a difference between the target signal power and the message signal power.
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Accused Products
Abstract
A method for determining EIRP of user terminals in a satellite communication system comprises obtaining a frequency gain of a gateway at one or more frequencies, obtaining a path gain of the gateway for one or more signal paths, and obtaining a satellite beacon signal power at a receiver of the gateway. The method also comprises determining a target signal power at the gateway for one or more frequency channels, where the target signal power based at least in part on the frequency gain, the path gain, and the satellite beacon signal power. The method also comprises obtaining a message signal power at the gateway of a message from a user terminal, and determining the EIRP of the user terminal based at least in part on a difference between the target signal power and the message signal power.
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Citations
20 Claims
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1. A method for determining effective isotropic radiated power (EIRP) of user terminals in a satellite communication system, the method comprising:
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obtaining a frequency gain measurement at each of a plurality of different frequencies at a gateway, the frequency gain measurement determined based on a difference between an input signal power and a measured signal power at the gateway for each of the plurality of different frequencies; obtaining a path gain measurement for each of a plurality of different signal paths at the gateway, the path gain measurement determined based on a difference between an input signal power and a measured signal power at the gateway for each of the plurality of different signal paths; obtaining a satellite beacon signal power measurement at a receiver of the gateway; obtaining a clear sky satellite beacon signal power measurement at a receiver of the gateway; determining a rain fade level on a return downlink between a satellite and the gateway based on a difference between the satellite beacon signal power measurement and the clear sky satellite beacon signal power measurement; determining a target signal power at the gateway for one or more frequency channels, the target signal power based on the frequency gain measurement, the path gain measurement, and the rain fade level; obtaining a message signal power at the gateway of a message from a user terminal; and determining the EIRP of the user terminal based on a difference between the target signal power and the message signal power. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A process for controlling power of return link transmissions in a satellite communications system, the process comprising:
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determining a first signal power of a first message from a user terminal; determining a first target signal power for one or more frequency channels, the first target signal power determined based on; a frequency gain measurement at each of a plurality of different frequencies at a gateway, the frequency gain measurement determined based on a difference between an input signal power and a measured signal power at the gateway for each of the plurality of different frequencies, a path gain measurement for each of a plurality of different signal paths at the gateway, the path gain measurement determined based on a difference between an input signal power and a measured signal power at the gateway for each of the plurality of different signal paths, and a rain fade level on a return downlink between a satellite and the gateway, the rain fade level determined based on a difference between a satellite beacon signal power measurement at a receiver of the gateway and a clear sky satellite beacon signal power measurement at a receiver of the gateway, determining a first EIRP of the user terminal based on a difference between the first signal power of the first message and the first target signal power; waiting a period of time; and repeating the process by determining a second signal power of a second message from the user terminal, determining a second target signal power, and determining a second EIRP of the user terminal based on a difference between the second signal power of the second message and the second target signal power. - View Dependent Claims (14, 15)
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16. An apparatus for determining effective isotropic radiated power (EIRP) of user terminals in a satellite communications system, comprising:
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an obtaining module configured to; obtain a frequency gain measurement at each of a plurality of different frequencies at a gateway, the frequency gain measurement determined based on a difference between an input signal power and a measured signal power at the gateway for each of the plurality of different frequencies; obtain a path gain measurement for each of a plurality of different signal paths at the gateway, the path gain measurement determined based on a difference between an input signal power and a measured signal power at the gateway for each of the plurality of different signal paths; obtain a satellite beacon signal power measurement at the gateway; obtain a clear sky satellite beacon signal power measurement at the gateway; and obtain a message signal power at the gateway of a message from a user terminal; a determining module configured to; determining a rain fade level on a return downlink between a satellite and the gateway based on a difference between the satellite beacon signal power measurement and the clear sky satellite beacon signal power measurement; determine a target signal power at the gateway based on the frequency gain measurement, the path gain measurement, and the rain fade level; and determine the EIRP of the user terminal based on a difference between the message signal power and the target signal power. - View Dependent Claims (17, 18, 19, 20)
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Specification