Adaptive transmission power control for cognitive radio

• US 8,509,706 B2
• Filed: 05/16/2011
• Issued: 08/13/2013
• Est. Priority Date: 02/20/2007
• Status: Active Grant

• Current Assignee: Siliconwaves Technologies Company Limited
• Original Assignee: Adaptrum Inc.
• Inventors: Tang, Haiyun
• Primary Examiner(s): Nguyen, Tu X
• Application Number:
  US13/108,784
• Publication Number:
  US 20110217944A1
• Time in Patent Office: 820 Days
• Field of Search: 455/69, 455/522, 455/3.06, 455/601, 455/504, 455/506
• US Class Current: 455/69
• CPC Class Codes: H04B 17/309 Measuring or estimating channel quality parameters
• CPC Class Codes: H04B 17/327 Received signal code power [RSCP]
• CPC Class Codes: H04B 17/354 Adjacent channel leakage power
• CPC Class Codes: H04N 5/50 Tuning indicators; Automatic tuning control
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 72/02 Selection of wireless resources by user or terminal
• CPC Class Codes: H04W 72/542 using measured or perceived quality

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.

Claims

1. 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.

2. The system of claim 1 wherein:

the value is at least partially determined by a combination of;

the lesser of the first parameter and the second parameter,

the third parameter,

the fourth parameter, and,

the fifth parameter.

3. The system of claim 1 wherein:

one or more of the first, second, and third parameters are at least partially determined by a collective sensing technique.

4. 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; and

,

providing a control signal corresponding to the first specified channel;

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.

5. The method of claim 4 further comprising the step of:

at least partially determining the value by a combination of;

the lesser of the first parameter and the second parameter,

the third parameter,

the fourth parameter, and,

the fifth parameter.

6. The method of claim 4 further comprising the step of:

at least partially determining one or more of the first, second, and third parameters by a collective sensing technique.