Adaptive Power Control Algorithm Based on SIR in Cognitive Radios

Aiming at the discrepancies of the Signal-to-Interference Ratio (SIR) among different users in Cognitive Radios (CR), a Nash game algorithm for SIR-based power control was adopted and a novel adaptive algorithm was designed based on a Space-Time Block Coding MC-CDMA (STBC MC-CDMA) system. Simulation results show that the novel algorithm can regulate their transmitter powers to meet the different SIR requirements effectively and the anti-interference performance of CR system is improved obviously.