Cooperative spectrum sensing with space-time coding and relay diversity

The performance of cooperative spectrum sensing is limited by the probability of reporting errors. An efficient quasi-orthogonal structure space-time code with a high diversity gain and coding gain was applied to reduce the transmission error rate. Moreover, a relay diversity based on cooperative spectrum sensing was proposed to increase the diversity of detection when some secondary user channels were in heavy shadowing. Simulation results show that the proposed algorithms further improve the cooperative spectrum sensing performance in the Rayleigh fading channel.