A novel relay-aided centralized cooperative spectrum sensing scheme using radio frequency energy harvesting

摘要

In a cooperative spectrum sensing (CSS) network, the primary signal can beused as a radio frequency (RF) source in order to power the energy-constrainedsensor nodes of the secondary network. This work presents a novel hybridmodel combining an optimal relay selection scheme to incorporate RF energyharvesting in a centralized CSS network. The secondary users, which areequipped with RF energy harvesting capabilities, act as relays in order to forwardthe sensing information to a fusion center. Here, we have derived anenhanced multi-relay selection strategy to maximize the end-to-end signal-tonoiseratio of the links. Furthermore, a new voting rule is proposed based onthe generalized K-out-of-M rule, such that it minimizes our objective errorfunction. The performance analysis of our proposed model is presented withrespect to the flexible relay positions. We have used complementary receiveroperating characteristic curves for analyzing the detection performance of theCSS model with our derived voting rule. Simulation results using MATLABshow that the proposed model gives a better detection probability and asmaller error rate than some related existing works.