Innovative combinational closed-loop and open-loop satellite user terminal power control system

A method for controlling a returnlink power of a user terminal, said method comprising:

• receiving a broadcasting-signal-to-noise-ratio;
• estimating a forwardlink carrier-signal-to-noise-ratio based on the broadcasting-signal-to-noise-ratio;
• predicting a forwardlink degradation based on the forwardlink carrier-signal-to-noise-ratio;
• calculating adaptively a conelation between a variation of forwardlink signal and a variation of the returnlink signal using a delayed feedback measurement;
• receiving an error of a returnlink signal;
• estimating a returnlink carrier-signal-to-noise-ratio based on the error;
• predicting a noise and interference of the returnlink signal;
• calculating a returnlink power signal based on the forwardlink degradation, noise and interference;
• using the returnlink power signal in the steps of estimating a returnlink carrier-signal-to-noise-ratio, predicting a forwardlink degradation, and predicting a noise and interference;
• and
• estimating a set of model parameters to adjust the noise, interference, and a dynamic degradation based on a Kalman filter.

A computer readable medium embodying program code with instructions for controlling a returnlink power, said computer readable medium comprising:

• program code for receiving a broadcasting-signal-to-noise-ratio;
• program code for estimating a forwardlink carrier-signal-to-noise-ratio
• based on the broadcasting-signal-to-noise-ratio;
• program code for predicting a variation of forwardlink degradation based on a variation of the forwardlink canier-signal-to-noise-ratio;
• program code for receiving an error of a returnlink signal;
• program code for estimating a returnlink carrier-signal-to-noise-ratio based on the error;
• program code for predicting a noise and interference of the returnlink signal;
• and
• program code for calculating a returnlink power signal based on the forwardlink degradation, noise and interference.

A satellite communication system, comprising:

• a satellite;
• and
• at least one user terminal comprising:
• a forwardlink receiver configured to receive a forwardlink broadcasting signal and a forwardlink user-data transmission signal from the satellite;
• a returnlink power control configured to generate a returnlink power signal based on the forwardlink broadcasting signal and the forwardlink user-data transmission signal;
• and
• a returnlink transmission configured to send the returnlink power signal to the satellite
• a gateway station configured to communicate with the satellite, wherein the gateway station further comprises:
• a feederlink receiver configured to receive a first signal from the satellite;
• and
• a feederlink transmission configured to receive a metric and a pilot tune signal power from the feederlink receiver and send a second signal to the satellite, wherein the second signal is based on the first signal, the metric, and the pilot tune signal power.

A satellite communication system, comprising:

• a satellite;
• at least one user terminal configured to communicate with the satellite via a channel, said at least one user terminal comprising:
• a forwardlink receiver configured to receive a forwardlink broadcasting signal and a forwardlink user-data transmission signal from the satellite;
• a returnlink power control configured to generate a returnlink power signal based on the forwardlink broadcasting signal and the forwardlink user-data transmission signal;
• and
• a returnlink transmission configured to send the returnlink power signal to the satellite;
• and
• a gateway station configured to communicate with the satellite comprising:
• a feederlink receiver configured to receive a first signal from the satellite;
• and
• a feederlink transmission configured to receive a metric and a pilot tune signal power from the feederlink receiver and send a second signal to the satellite, wherein the second signal is based on the first signal, the metric, and the pilot tune signal power.

A method for controlling a returnlink power of a user terminal, said method comprising:

• receiving a returnlink and a returnlink power;
• estimating a returnlink carrier-signal-to-noise-ratio based on the returnlink error and returnlink power;
• predicting a noise and interference of the returnlink power based on the returnlink carrier-signal-to-noise-ratio and the returnlink power;
• receiving a forwardlink power;
• estimating a forwardlink caffier-signal-to-noise-ratio based on the forwardlink power;
• calculating adaptively a correlation between a variation of the forwardlink power and a variation of the returnlink power;
• predicting a forwardlink degradation based on the forwardlink carrier-signal-to-noise-ratio, the correlation and the returnlink power;
• and
• computing a returnlink power based on the noise, the interference and the forwardlink degradation.

A computer readable medium embodying program code with instructions for controlling a returnlink power, said computer readable medium comprising:

• program code for receiving a returnlink error and a returnlink power;
• program code for estimating a returnlink carrier-signal-to-noise-ratio based on the returnlink error and returnlink power;
• program code for predicting a noise and interference of the returnlink power based on the returnlink carrier-signal-to-noise-ratio and the returnlink power;
• program code for receiving a forwardlink power;
• program code for estimating a forwardlink carrier-signal-to-noise-ratio based on the forwardlink power;
• program code for calculating adaptively a correlation between a variation of the forwardlink power and a variation of the returnlink power;
• program code for predicting a forwardlink degradation based on the forwardlink carrier-signal-to-noise-ratio, the correlation and the returnlink power;
• and
• program code for computing a returnlink power based on the noise, the interference and the forwardlink degradation.