Patent ID: 7945215
Filing Date: 2011-05-17
Classification: H04B,H04N,H04W

Abstract:
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; 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.