Power control algorithm based on game theory in cognitive radio networks

In cognitive radio (CR) networks, power control is necessary to not only decrease the interference among the secondary users (SUs), but also avoid negative impact to the primary users (PUs). To meet the communications needs between PUs and SUs in cognitive radios and to ensure that the unimpaired operation of the PUs and SUs' communications be not intermitted, a MC-CDMA cognitive radios system and a hand-off technique were proposed for secondary users. In order to efficiently use the limited cognitive radio resources, a novel power control game algorithm in CR systems was adopted. The novel algorithm can regulate their transmitter powers to meet the different SINR requirements and enhance the total throughput effectively. The computer simulations show that the performance of CR system is thereby improved obviously.