Cognitive Radio Networks with Energy Harvesting and Eavesdropping-Emulation Resilience

Abstract

Spectrum scarcity, limited power and coverage, reliable data transmission, security threats, etc. are few challenges in future 5G enabling wireless transceiver nodes. Cognitive radio (CR) while looks promising to address spectrum scarcity problem, energy harvesting (EH) would then provide operation sustainability, thus integration leads to EH-enabled CR network (CRN). Since spectrum sensing (SS) and secondary data transmission are two key issues in a CR system, primary user emulation attack (PUEA) and eavesdropping are the two common security threats in any CRN. Thus a CR system design needs opportunistic sharing for reliable data transmission with sustainable network operation in presence of such security threats. A CRN model is proposed here that includes a set of transmit-receive node pairs of secondary users (SUs) to share primary user (PU) spectrum, one fusion center (FC), one PUEA node, an eavesdropper node and multiple cooperative jammers to countermeasure the effect of eavesdropping. Protection in eavesdropping is done by selecting the best friendly jammer that minimizes the signal-to-interference plus noise ratio at the eavesdropper. The objective of this study is to maximize the sum secondary throughput of the network under the constraints of meeting the sensing reliability of PU, individual energy causality for each SU and friendly jammer, interference at PU receiver, individual secondary and secrecy outage probability. Simulation result show the efficacy of the proposed scheme.