Method and apparatus for controlling transmit power and incumbent protection in a cognitive radio system
First Claim
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1. A method of operating a cognitive radio (CR) device to avoid interference with an incumbent receiver, comprising:
- determining maximum allowed transmit power level of the CR device based on at least one estimated incumbent signal level in a local environment, at least one corresponding estimated transmitter splatter level of the CR device, and at least one co-channel incumbent receiver protection requirement;
wherein the step of determining further comprises;
applying an offset from the at least one estimated incumbent signal level, said offset determined by the at least one co-channel incumbent receiver interference protection requirement; and
selecting a transmit power level that is a minimum of the at least one estimated incumbent signal level; and
wherein the step of determining further comprises;
applying an offset from the at least one estimated incumbent signal level based on the least one corresponding estimated transmitter splatter level and the at least one incumbent receiver co-channel interference protection requirement; and
selecting a transmit power level that is a minimum as determined by the at least one transmitter splatter level; and
transmitting with the maximum allowed transmit power level thereby avoiding interference with the incumbent receiver while maximizing transmit power level of the CR device.
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Abstract
A cognitive radio (CR) device (208 and/or 218) avoids interference with an incumbent (207) receiver by determining maximum allowed transmit power levels of the CR device based on estimates of the incumbent signal level and transmit splatter levels of the CR device. The CR device (208 and/or 218) avoids interference with the incumbent receiver while transmitting with maximum transmit power levels.
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Citations
14 Claims
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1. A method of operating a cognitive radio (CR) device to avoid interference with an incumbent receiver, comprising:
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determining maximum allowed transmit power level of the CR device based on at least one estimated incumbent signal level in a local environment, at least one corresponding estimated transmitter splatter level of the CR device, and at least one co-channel incumbent receiver protection requirement; wherein the step of determining further comprises; applying an offset from the at least one estimated incumbent signal level, said offset determined by the at least one co-channel incumbent receiver interference protection requirement; and selecting a transmit power level that is a minimum of the at least one estimated incumbent signal level; and wherein the step of determining further comprises; applying an offset from the at least one estimated incumbent signal level based on the least one corresponding estimated transmitter splatter level and the at least one incumbent receiver co-channel interference protection requirement; and selecting a transmit power level that is a minimum as determined by the at least one transmitter splatter level; and transmitting with the maximum allowed transmit power level thereby avoiding interference with the incumbent receiver while maximizing transmit power level of the CR device.
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2. A method of operating a cognitive radio (CR) device to avoid interference with an incumbent receiver, comprising:
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estimating an incumbent signal level at the incumbent receiver; determining interference protection ratios for the incumbent device, including a co-channel interference protection ratio for the incumbent; applying a transmit power level reduction to the CR device based on the interference protection ratios and the estimated incumbent signal level; estimating at least one CR transmitter out-of-band splatter level into a co-channel of the incumbent receiver; and applying a further CR transmit power level reduction based on the estimated CR transmitter splatter level, estimated incumbent signal level, and the incumbent receiver co-channel interference protection ratio thereby avoiding interference with the incumbent receiver. - View Dependent Claims (3, 4, 5, 6, 7, 8)
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9. A method of operating a cognitive radio (CR) device to avoid interference with an incumbent receiver, comprising:
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estimating an incumbent signal level at the incumbent receiver; determining interference protection ratios for the incumbent device, including a co-channel interference protection ratio for the incumbent; applying a transmit power level reduction to the CR device based on the interference protection ratios and the estimated incumbent signal level; estimating at least one CR transmitter out-of-band splatter level, wherein the step of estimating the at least one CR transmitter out-of-band splatter level is predicted based on a predetermined mask level; and applying a further CR transmit power level reduction based on the estimated CR transmitter splatter level, estimated incumbent signal level, and the incumbent receiver co-channel interference protection ratio.
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10. A method of operating a cognitive radio (CR) device to avoid interference with an incumbent receiver, comprising:
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estimating an incumbent signal level at the incumbent receiver; determining interference protection ratios for the incumbent device, including a co-channel interference protection ratio for the incumbent; applying a transmit power level reduction to the CR device based on the interference protection ratios and the estimated incumbent signal level; estimating at least one CR transmitter out-of-band splatter level, wherein the step of estimating the at least one CR transmitter out-of-band splatter level is based on a combination of predetermined CR transmitter characteristics and knowledge of CR transmitter power level; and applying a further CR transmit power level reduction based on the estimated CR transmitter splatter level, estimated incumbent signal level, and the incumbent receiver co-channel interference protection ratio.
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11. A method of operating a cognitive radio (CR) device to avoid interference with an incumbent receiver, comprising:
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estimating an incumbent signal level at the incumbent receiver; determining interference protection ratios for the incumbent device, including a co-channel interference protection ratio for the incumbent; applying a transmit power level reduction to the CR device based on the interference protection ratios and the estimated incumbent signal level; estimating at least one CR transmitter out-of-band splatter level, wherein the step of estimating the at least one CR transmitter out-of-band splatter level is based on; measuring the at least one CR transmitter out-of-band emission at a least one power output level; and utilizing the measured at least one CR transmitter out-of-band splatter level during the step of applying a further transmit power level reduction; and applying a further CR transmit power level reduction based on the estimated CR transmitter splatter level, estimated incumbent signal level, and the incumbent receiver co-channel interference protection ratio.
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12. A method of operating a cognitive radio (CR) device to avoid interference with an incumbent receiver, comprising:
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estimating an incumbent signal level at the incumbent receiver; determining interference protection ratios for the incumbent device, including a co-channel interference protection ratio for the incumbent; applying a transmit power level reduction to the CR device based on the interference protection ratios and the estimated incumbent signal level; estimating at least one CR transmitter out-of-band splatter level, wherein the at least one CR transmitter out-of-band splatter level is modeled based on knowledge of nonlinear performance of the transmitter and the transmit power level setting; and applying a further CR transmit power level reduction based on the estimated CR transmitter splatter level, estimated incumbent signal level, and the incumbent receiver co-channel interference protection ratio.
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13. A cognitive radio (CR) device operating within an incumbent receiver'"'"'s spectrum, the CR device comprising:
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a transmitter; a controller coupled to the transmitter and having at least one of a geo-location database or sensing capability, the CR device estimating incumbent signal levels and estimating CR transmitter out-of-band splatter levels into a co-channel of the incumbent receiver'"'"'s spectrum; and the CR device adjusting transmit power level in response to the estimated incumbent signal levels and the estimated CR transmitter out-of-band splatter levels thereby avoiding interference with the incumbent receiver. - View Dependent Claims (14)
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Specification