Spectrum Detection Based on SNR in Cognitive Radio

Fading shadowing and hidden terminal problems in cognitive radio systems cannot be avoided. Cooperative spectrum detection is an appropriate way to solve this problem. Because the cognitive node’s SNR has influence in cooperative detection, Smart antenna and power control are combined to reduce interference and error rate to improve the performance of the system, then to combine with twice cooperative spectrum detection. in this way cognitive radio system can improve transmission power, SNR, reducing global missing detection probability, false alarm probability in global. Simulation results show the way is available.