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; and
transmitting with no more than the maximum allowed transmit power level thereby avoiding interference with the incumbent receiver.
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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
27 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; and transmitting with no more than the maximum allowed transmit power level thereby avoiding interference with the incumbent receiver. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. 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; 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. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. 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; 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. - View Dependent Claims (20)
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21. A communications network, comprising:
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a licensed TV receiver operating in a television white space (TVWS) environment; a cognitive radio device operating in the TVWS environment, the CR device transmitting with a modulated signal having a passband level that does not exceed the TV receiver selectivity limits for adjacent channel, alternate channel and beyond alternate channel; and the CR device emitting out-of-band emissions (OOBE) falling co-channel with the licensed incumbent signal that do not exceed a predetermined co-channel interference protection ratio. - View Dependent Claims (22, 23, 24, 25, 26, 27)
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Specification