Power Control with Rank Based Censoring in Cognitive Radio Network

The transmit power of secondary users (SUs) in an underlay cognitive radio network (CRN) needs to be controlled to limit the interference on primary users (PUs). The performance of spectrum sensing plays an important role in controlling the cognitive radio (CR) transmission power. Co-operative spectrum sensing (CSS) improves the performance of spectrum sensing. Incorporation of Rank-based censoring with CSS reduces the transmission overhead as well as improves the decision regarding the presence of primary user (PU) by eliminating the reporting channels whose SNR condition is bad. The efficient spectrum sensing leads to control the secondary transmission power accurately. In a co-existing network the controlled power from CR network minimize the interference to PU. The maximum allowable transmission powers of CRs have also been investigated with respect to distance between PU receiver and CRs in a co-operative spectrum sensing framework. The impact of reporting channel (R- channel) SNR on maximum allowable transmission power has been investigated.