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US 7,945,215 B2Granted
Adaptive transmission power control for cognitive radio
AssigneeAdaptrum, Inc.
InventorHaiyun Tang
Life of this patent
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Abstract
Embodiments of cognitive radio technology can recover and utilize under-utilized portions of statically-allocated radio-frequency spectrum. A plurality of sensing methods can be employed. Transmission power control can be responsive to adjacent channel measurements. Digital pre-distortion techniques can enhance performance. Embodiments of a high DNR transceiver architecture can be employed.
Claims6
A cognitive radio system comprising:
- a cognitive radio receiver adapted to
- receive a broadcast signal, and,
- provide a first specified channel and a plurality of adjacent channels, responsive to the broadcast signal,
- wherein the plurality of adjacent channels comprises a first adjacent channel and a second adjacent channel;
- a power measurement and control unit adapted to
- receive the first specified channel and the plurality of adjacent channels,
- determine a first parameter,
- determine a second parameter,
- determine a third parameter,
- wherein the first parameter corresponds to a first adjacent channel received signal power,
- wherein the second parameter corresponds to a second adjacent channel received signal power,
- wherein the third parameter corresponds to an adjacent channel leakage ratio;
- and,
- a control element adapted to
- receive the first parameter, the second parameter, the third parameter, a fourth parameter, and a fifth parameter,
- determine a value corresponding to a maximum allowed cognitive user transmission power level for the first specified channel, responsive to the received parameters, and,
- provide a control signal corresponding to the first specified channel,
- wherein the control signal specifies the value,
- wherein the fourth parameter corresponds to a specified signal power loss, and,
- wherein the fifth parameter corresponds to a specified desired-to-undesired ratio;
- and,
- a cognitive radio transmitter adapted to
- receive the control signal, and,
- provide transmission power for the first specified channel at a transmission power level responsive to the value.
21 more elements
A method of adaptive transmission power control for cognitive radio comprising the steps of:
- receiving a broadcast signal;
- providing a first specified channel and a plurality of adjacent channels, responsive to the broadcast signal;
- receiving the first specified channel and the plurality of adjacent channels;
- determining a first parameter;
- determining a second parameter;
- determining a third parameter;
- receiving the first parameter, the second parameter, the third parameter, a fourth parameter, and a fifth parameter;
- determining a value corresponding to a maximum allowed cognitive user transmission power level for the first specified channel, responsive to the received parameters;
- providing a control signal corresponding to the first specified channel;
- providing a cognitive radio transmitter;
- receiving the control signal;
- and,
- providing transmission power for the first specified channel at a transmission power level responsive to the value;
- wherein the control signal specifies the value;
- wherein the plurality of adjacent channels comprises a first adjacent channel and a second adjacent channel;
- wherein the first parameter corresponds to a first adjacent channel received signal power;
- wherein the second parameter corresponds to a second adjacent channel received signal power;
- wherein the third parameter corresponds to an adjacent channel leakage ratio;
- wherein the fourth parameter corresponds to a specified signal power loss;
- and,
- wherein the fifth parameter corresponds to a specified desired-to-undesired ratio.
18 more elements
Dependencies are inferred from the claim text.