Adaptive return link for two-way satellite communication systems
First Claim
1. In a system broadcasting downlink signal having a plurality of channels to a plurality of ground stations, each ground station receiving one of the plurality of channels, a method of adaptively transmitting an uplink signal from one of the ground stations to a satellite, comprising the steps of:
- receiving a transmitted downlink signal at the ground station from the satellite;
measuring a quality of the received signal;
computing a prediction of a degradation of the uplink signal using the quality of the received signal; and
transmitting the uplink signal according to the predicted degradation of the uplink signal.
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Accused Products
Abstract
A method and apparatus for adaptively transmitting an uplink signal comprising information from a ground station to a satellite is disclosed. The method comprises the steps of receiving a transmitted downlink signal at a ground station from the satellite; measuring the quality of the transmitted signal; computing a prediction of a degradation of the uplink signal using the quality of the received signal, and transmitting the uplink signal according to the predicted degradation of the uplink signal. The apparatus comprises a tuner for receiving a transmitted downlink signal from the satellite; a signal analyzer, communicatively coupled to the tuner, for measuring a characteristic of the received downlink signal; an uplink degradation estimation module, communicatively coupled to the signal analyzer, for estimating the degradation of the uplink signal from the received downlink signal characteristic; and a controller, communicatively coupled to the uplink degradation module, for controlling the transmission of the uplink signal according to the estimated degradation of the uplink signal.
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Citations
30 Claims
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1. In a system broadcasting downlink signal having a plurality of channels to a plurality of ground stations, each ground station receiving one of the plurality of channels, a method of adaptively transmitting an uplink signal from one of the ground stations to a satellite, comprising the steps of:
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receiving a transmitted downlink signal at the ground station from the satellite; measuring a quality of the received signal; computing a prediction of a degradation of the uplink signal using the quality of the received signal; and transmitting the uplink signal according to the predicted degradation of the uplink signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. An apparatus for adaptively transmitting an uplink signal comprising information from a ground station to a satellite, comprising:
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a tuner for receiving a transmitted downlink signal from the satellite; a signal analyzer, communicatively coupled to the tuner, for measuring a characteristic of the received downlink signal; an uplink degradation estimation module, communicatively coupled to the signal analyzer, for estimating a degradation of the uplink signal from the received downlink signal characteristic; and a controller, communicatively coupled to the uplink degradation module for controlling the transmission of the uplink signal according to the estimated degradation of the uplink signal. - View Dependent Claims (19, 20)
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21. An apparatus for adaptively transmitting an uplink signal comprising information from a ground station to a satellite, comprising:
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means for receiving a transmitted downlink signal at the ground station from the satellite; means for measuring a quality of the received signal; means for computing a prediction of a degradation of the uplink signal using the quality of the received signal; and means for transmitting the uplink signal according to the predicted degradation of the uplink signal. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification