Proactive Spectrum Sharing Incentive For Physical Layer Security Enhancement Using Antenna Selection and Power Allocation Schemes

Abstract

Wireless communication has gained much importance over the past few decades. Due to its increasing demand in industrial and military applications, the need to secure wireless communication from un-authorized users has also gained more at- tention. To provide secure communication various techniques and protocols have been proposed so far and implemented at Physical layer of the network. Cognitive Radio (CR) appeared as an emerging technique to overcome the problem of spec- trum scarcity and with that introduced various security challenges. This research work also proposes a system model that aims to provide secure communication over a Cognitive Radio Network (CRN). The system model in our study consists of two networks called the Primary Network (PN) and the Secondary Network (SN) which collaborate and gain incentive from each other. The communication over PN takes place in the presence of a multi-antenna Eavesdropper that aims to exploit the in- formation transfered at PN. The communication is made secure with a help of a SN that transmits high interference at Eavesdropper (Eve) so that the transmis- sion rate of PN is always greater than the transmission rate at the Eavesdropper. This article focuses on the analysis of proposed and conventional system model by comparing the theoretical results with simulations. The theoretical results obtained for the proposed scheme match exactly to those of the simulation results. Mutual Outage Probability (MOP) that measures the overall reliability of the information signal transmitted is obtained analytically and numerically. Simultaneously, Secrecy Outage Probability (SOP) that is the measure of how secure is the transmitted in- formation is obtained and the results are compared. In addition, the outages at PN and SN and the Transmission Capacity of both the networks are obtained and the results are plotted and compared against conventional scheme. The numerical analysis done in this work shows that this system model not only provides a high secrecy to the PN but at the same time improves outage performance and channel's transmission capacity at the SN. However, we notice that the increase in secrecy at PN results in some amount of signal distortion also but within acceptable limits.