Abstract
This paper investigates the physical layer security and data transmission in cellular networks with inband underlay Device-to-Device (D2D) communications, where there is no direct link between D2D users. We propose to apply full-duplex (FD) transmission and dual antenna selection at the D2D relay node. The relay node can simultaneously act as a friendly jammer to improve the secrecy performance of the cellular network while enhancing the D2D communication data transmission. This is an appealing and practical scheme where spectrum sharing is beneficial for the D2D and cellular networks in terms of reliability enhancement and security provisioning, respectively. The practical scenario, where the eavesdropper is passive, is considered. The eavesdropper uses either selection combining or maximal ratio combining to combine the wiretapped signals of the cellular network. The secrecy performance of the cellular network is analyzed, and closed-form expressions for the secrecy outage probability and the probability of non-zero secrecy capacity are derived. We show that increasing the number of FD jamming antennas enhances the secrecy performance of the cellular network. A closed-form expression of the D2D outage probability is also provided. Simulation and numerical results are provided to verify the efficiency of the proposed scheme and to validate the accuracy of the derived expressions.
Highlights
Device-to-Device (D2D) communication, which enables proximate user pairs to communicate directly rather than through the base station (BS), has received considerable attention as one of the main technologies in the fifthgeneration (5G) cellular communications [1]
In overlay D2D communication, the cellular spectrum is split into non-overlapping frequency sets, where one set is allocated to D2D users, while the other is allocated to the cellular users
AND DISCUSSIONS the analytical results of the D2D outage probability, the secrecy outage probability (SOP), and the probability of nonzero secrecy capacity (PNSC) are presented and compared with those obtained by Monte-Carlo simulations
Summary
Device-to-Device (D2D) communication, which enables proximate user pairs to communicate directly rather than through the base station (BS), has received considerable attention as one of the main technologies in the fifthgeneration (5G) cellular communications [1]. We study the PLS of FD relay-aided underlay D2D communication and propose a dual antenna selection to enhance the secrecy performance of the cellular network and increase the reliability in the D2D communication concurrently. This is achieved by equipping the relay with FD multiple-input multiple-output (MIMO) antennas. A dual antenna selection at the FD MIMO relay is proposed to improve the data transmission of the D2D communication and enhance the secrecy capacity of the cellular network simultaneously.
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