Combined sensing methods for cognitive radio
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 dynamic range transceiver architecture can be employed.
1. A method for sensing for cognitive radio comprising the steps of:
receiving a first specified target signal;
performing one or more first specified energy sensing functions,
wherein the one or more first specified energy sensing functions are at least partially responsive to the first specified target signal;
performing one or more first specified phase sensing functions,
wherein the one or more first specified phase sensing functions are at least partially responsive to the first specified target signal;
determining a first sensing result,
wherein the first sensing result is at least partially responsive to the one or more first specified energy sensing functions and at least partially responsive to the one or more first specified phase sensing functions;
performing one or more first specified collective sensing functions,
wherein the one or more first specified collective sensing functions are at least partially responsive to the first specified target signal; and,
determining a first combined sensing result,
wherein the first combined sensing result is at least partially responsive to the one or more first specified energy sensing functions and at least partially responsive to the one or more first specified phase sensing functions and at least partially responsive to the one or more first specified collective sensing functions.
2. The method of claim 1 further comprising the steps of:
receiving a second specified target signal;
performing one or more second specified energy sensing functions,
wherein the one or more second specified energy sensing functions are at least partially responsive to the second specified target signal;
performing one or more second specified phase sensing functions,
wherein the one or more second specified phase sensing functions are at least partially responsive to the second specified target signal; and,
determining a second sensing result,
wherein the second sensing result is at least partially responsive to the one or more second specified energy sensing functions and at least partially responsive to the one or more second specified phase sensing functions.
3. The method of claim 2 further comprising the steps of:
performing one or more second specified collective sensing functions,
wherein the one or more second specified collective sensing functions are at least partially responsive to the second specified target signal; and,
determining a second combined sensing result,
wherein the second combined sensing result is at least partially responsive to the one or more second specified energy sensing functions and at least partially responsive to the one or more second specified phase sensing functions and at least partially responsive to the one or more second specified collective sensing functions.
4. The method of claim 3 further comprising the step of:
determining a first collective sensing result,
wherein the first collective sensing result at least partially responsive to the one or more first specified collective sensing functions and at least partially responsive to the one or more second specified collective sensing functions.
5. A system for sensing for cognitive radio comprising:
a first cognitive radio unit comprising:
a first energy sensing element,
wherein the first energy sensing element provides one or more first specified energy sensing functions, and,
wherein the one or more first specified energy sensing functions are at least partially responsive to a first specified target signal; and,
a first phase sensing element,
wherein the first phase sensing element provides one or more first specified phase sensing functions, and,
wherein the one or more first specified phase sensing functions are at least partially responsive to the first specified target signal;
wherein the first cognitive radio unit provides a first sensing result at least partially responsive to the one or more first specified energy sensing functions and at least partially responsive to the one or more first specified phase sensing functions;
a first collective sensing element;
wherein the first collective sensing element provides one or more first specified collective sensing functions;
wherein the one or more first specified collective sensing functions are at least partially responsive to the first specified target signal; and,
wherein the first cognitive radio unit provides a first combined sensing result at least partially responsive to the one or more first specified energy sensing functions and at least partially responsive to the one or more first specified phase sensing functions and at least partially responsive to the one or more first specified collective sensing functions.
6. The system of claim 5 further comprising:
a second cognitive radio unit comprising:
a second energy sensing element,
wherein the second energy sensing element provides one or more second specified energy sensing functions,
wherein the one or more second specified energy sensing functions are at least partially responsive to a second specified target signal; and,
a second phase sensing element,
wherein the second phase sensing element provides one or more second specified phase sensing functions, and,
wherein the one or more second specified phase sensing functions are at least partially responsive to the second specified target signal; and,
wherein the second cognitive radio unit provides a second sensing result at least partially responsive to the one or more second specified energy sensing functions and at least partially responsive to the one or more second specified phase sensing functions.
7. The system of claim 6 further comprising:
a second collective sensing element;
wherein the second collective sensing element provides one or more second specified collective sensing functions;
wherein the one or more second specified collective sensing functions are at least partially responsive to the second specified target signal; and,
wherein the second cognitive radio unit provides a second combined sensing result at least partially responsive to the one or more second specified energy sensing functions and at least partially responsive to the one or more second specified phase sensing functions and at least partially responsive to the one or more second specified collective sensing functions; and,
wherein the system provides interoperation between two or more of the first energy sensing element, the first phase sensing element, the first collective sensing element, the second energy sensing element, the second phase sensing element, and the second collective sensing element.
8. The system of claim 7 wherein:
the first cognitive radio unit provides a first collective sensing result at least partially responsive to the one or more first specified collective sensing functions and at least partially responsive to the one or more second specified collective sensing functions.