AUTOMATIC UPLINK POWER CONTROL IN INTERFERENCE CANCELLATION BASED SPECTRAL REUSE
First Claim
1. A method for compensating for signal attenuation in a satellite communication system comprising the steps of:
- transmitting a first signal to a satellite via an uplink path;
receiving a second signal from the satellite via a downlink path;
monitoring a first value, wherein the first value is a measured level of the first signal within the second signal relative to a reference level of the first signal within the second signal; and
estimating an amount of attenuation along the uplink path, based on the first value and the frequencies of the first and second signals.
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Accused Products
Abstract
A system and method for performing automatic uplink power control (AUPC), using interference cancellation, to compensate for signal attenuation in a satellite communication system in which uplink path attenuation, forward channel attenuation, or both are estimated at a hub station without requiring signal quality reports from a remote station, and without requiring a satellite beacon. Estimates of uplink path attenuation or forward channel attenuation are used by the hub station to control the output power of a transmitted signal, thereby compensating for the estimated attenuation.
13 Citations
17 Claims
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1. A method for compensating for signal attenuation in a satellite communication system comprising the steps of:
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transmitting a first signal to a satellite via an uplink path; receiving a second signal from the satellite via a downlink path; monitoring a first value, wherein the first value is a measured level of the first signal within the second signal relative to a reference level of the first signal within the second signal; and estimating an amount of attenuation along the uplink path, based on the first value and the frequencies of the first and second signals. - View Dependent Claims (2, 3, 4)
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5. A method for compensating for signal attenuation in a satellite communication system comprising the steps of:
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transmitting a first signal to a satellite via an uplink path; receiving a second signal from the satellite via a downlink path; extracting a third signal from the second signal by cancelling the first signal from the second signal; monitoring a first value, wherein the first value is a measured level of the first signal within the second signal relative to a reference level of the first signal within the second signal; monitoring a second value, wherein the second value is a measured energy per bit to noise power spectral density ratio (Eb/N0) of the third signal relative to a reference Eb/N0 of the third signal; and estimating an amount of attenuation along a forward channel, based on the first and second values and the frequencies of the first and second signals. - View Dependent Claims (6, 7, 8, 9, 10)
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11. A hub station for use with a satellite communication system, the hub station comprising:
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a means for transmitting a first signal to a satellite via an uplink path; a means for receiving a second signal from a satellite via a downlink path; a means for monitoring a first value, wherein the first value is a measured level of the first signal within the second signal relative to a reference level of the first signal within the second signal; and a means for estimating an amount of attenuation along the uplink path, based on the first value and the frequencies of the first and second signals. - View Dependent Claims (12, 13)
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14. A hub station for use with a satellite communication system, the hub station comprising:
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a means for transmitting a first signal to a satellite via an uplink path; a means for receiving a second signal from a satellite via a downlink path; a means for extracting a third signal from the second signal by cancelling the first signal from the second signal; a means for monitoring a first value, wherein the first value is a measured level of the first signal within the second signal relative to a reference level of the first signal within the second signal; and a means for monitoring a second value, wherein the second value is a measured energy per bit to noise power spectral density ratio (Eb/N0) of the third signal relative to a reference Eb/N0 of the third signal; and a means for estimating an amount of attenuation along a forward channel, based on the first and second values and the frequencies of the first and second signals. - View Dependent Claims (15, 16, 17)
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Specification