Power Control in Opportunistic Spectrum Access Cognitive Radio With Sensing Information at Transmitter
In an opportunistic spectrum access based cognitive radio network, it is usually assumed that the Secondary User (SU) will transmit at peak power when it detects that the Primary User (PU) is absent while it will not transmit when the PU is detected to be present. However, when the PU is detected to be inactive, the PU may not definitely be inactive as it may be a case of misdetection. If it is a miss-detection, the SU's data rate for that particular data frame will be reduced due to interference from the PU. In this paper, power allocation strategies are designed for each data frame based on the Spectrum Sensing Information (SSI) gathered during the sensing period.