Biblio

In this paper, we study an underlay Cognitive Radio (CR) system with energy harvesting over Nakagami-m fading channel. This system consists of a secondary source, a secondary receiver, a primary receiver and a single eavesdropper. The source in the secondary network has one antenna and transmits information to the secondary receiver equipped with two separated antennas to operate in a Full-Duplex (FD) mode. The upper and lower bounds for the Strictly Positive Secrecy Capacity (SPSC) are derived and the numerical results demonstrate that the performance of the proposed system can be improved by increasing the average channel power gain between the source and the destination. Here, the lower and upper bounds are merged to form the exact SPSC when the total interference is below a predefined limit.

In this short position paper, we discuss several potential security concerns that can be found at the physical layer of 6th-generation (6G) cellular networks. Discussion on 6G cellular networks is still at its early stage and thus several candidate radio technologies have been proposed but no single technology has yet been finally selected for 6G systems. Among several radio technologies, we focus on three promising ones for 6G physical-layer technologies: reconfigurable intelligent surface (RIS), Open-RAN (O-RAN), and full-duplex radios. We hope this position paper will spark more active discussion on the security concerns in these new radio technologies.