Twice-cooperative spectrum detection based on SNR comparison in cognitive radio systems

Fading,shadowing and hidden terminal problems in cognitive radio systems can not be avoided.To overcome there problems,cooperative spectrum detection was proposed.But cooperative spectrum detection and local spectrum detection share a common lot.In this paper,we proposed a twice-cooperative spectrum detection algorithm based on SNR comparison in cognitive radio and analysed the non-ideal reporting channel.Numerical analysis and computer simulation suggest that the scheme greatly increases the probability of detection,reduces the node number to participate and the amount of data in decision fusion.