Interference resistant satellite link power control using uplink noise measurements
First Claim
1. A method for determining an effective isotropic radiated power (EIRP) adjustment for user terminals in a satellite communications system, the method comprising:
- determining a return uplink thermal noise estimate at a gateway, the return uplink thermal noise estimate determined at each of a plurality of different frequencies using total power measurements;
obtaining a target return uplink signal density relative to thermal noise density based on end to end link characteristics and off-axis emissions from the user terminals;
determining a target signal power at a gateway in the satellite communications system for one or more frequency channels, the target signal power based at least in part on the return uplink thermal noise and the target return uplink signal density relative to the thermal noise density;
obtaining a message signal power at the gateway of one or more messages from a user terminal, the message signal power determined by a demodulator at the gateway; and
determining the EIRP adjustment for 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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Accused Products
Abstract
A method for determining EIRP of user terminals in a satellite communications system comprises measuring a return uplink thermal noise at one or more frequencies, obtaining a target return uplink signal density relative to thermal noise density, and determining a target signal power at a gateway in the satellite communications system for one or more frequency channels. The target signal power may be based at least in part on the return uplink thermal noise and the target return uplink signal density relative to the thermal noise density. The method also comprises obtaining a message signal power at the gateway of one or more messages 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
18 Claims
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1. A method for determining an effective isotropic radiated power (EIRP) adjustment for user terminals in a satellite communications system, the method comprising:
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determining a return uplink thermal noise estimate at a gateway, the return uplink thermal noise estimate determined at each of a plurality of different frequencies using total power measurements; obtaining a target return uplink signal density relative to thermal noise density based on end to end link characteristics and off-axis emissions from the user terminals; determining a target signal power at a gateway in the satellite communications system for one or more frequency channels, the target signal power based at least in part on the return uplink thermal noise and the target return uplink signal density relative to the thermal noise density; obtaining a message signal power at the gateway of one or more messages from a user terminal, the message signal power determined by a demodulator at the gateway; and determining the EIRP adjustment for the user terminal based at least in part on a difference between the target signal power and the message signal power. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for controlling power of return link transmissions in a satellite communications system, the method comprising:
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obtaining a return uplink thermal noise estimate at one or more frequencies, the return uplink thermal noise estimate based at least in part on a total power measurement from a series of total power measurements; obtaining a target return uplink signal density relative to thermal noise density; determining a target signal power at a gateway for one or more frequency channels, the target signal power based at least in part on the return uplink thermal noise estimate and the target return uplink signal density relative to thermal noise density; obtaining a message signal power at the gateway of a message from a user terminal; and determining an EIRP of the user terminal based at least in part on a difference between the target signal power and the message signal power. - View Dependent Claims (10, 11, 12, 13)
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14. An apparatus for determining an effective isotropic radiated power (EIRP) adjustment for user terminals in a satellite communications system, comprising:
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an obtaining module comprising hardware configured to; obtain a return uplink thermal noise estimate at a gateway, the return uplink thermal noise estimate obtained at each of a plurality of different frequencies using total power measurements; obtaining a target return uplink signal density relative to thermal noise density based on end to end link characteristics and off-axis emissions from the user terminals; and obtain a message signal power at a gateway in the satellite communications system of a message from a user terminal; a determining module comprising hardware configured to; determine a target signal power at the gateway based at least in part on the return uplink thermal noise estimate and the target return uplink signal density relative to thermal noise density; and determine the EIRP adjustment for the user terminal based at least in part on a difference between the target signal power and the message signal power. - View Dependent Claims (15, 16, 17, 18)
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Specification