Chain-based OR-rule cooperative spectrum sensing scheme in cognitive sensing networks

In cognitive radio networks, secondary users can implement cooperative spectrum sensing to achieve better performance than single secondary user sensing. However, the accuracy of cooperative sensing can be severely degraded when the report and inter-user channels experience fading in reality. Aiming at solving this problem, we proposed a chain-based OR-rule cooperative spectrum sensing scheme. To minimize the interference caused by the fading report and inter-user channels, local decision message is transmitted from one secondary user to its neighbor user in this scheme, instead of the fusion center, until the primary user presence decision made. Meanwhile, the proposed scheme is time and energy efficient, when adaptive transmission power selection is employed. Simulation results show that the cooperative spectrum sensing performance, as well as the time and energy efficiency, is improved by adopting the proposed scheme.