Step combination cooperative spectrum sensing algorithm based on autocorrelation matrix

Based on autocorrelation matrix theory of spectrum sensing for cognitive radio (CR). To solve the high cost of cooperative spectrum sensing, this paper proposed a spectrum sensing algorithm by step combination cooperative strategy, with the purpose of keeping balance between accuracy and velocity, the method chooses CR numbers and its users from all CR users randomly. Simulation results show that the method can not only ensure the correctness, but also reduce the extra data overhead result from the cooperative spectrum sensing and shorten the spectrum sensing search time, meanwhile, it is able to ease the burden of central controller and improve the performance of CR system as a whole.