Secrecy Outage and Diversity Analysis in D2D-Enabled Cellular Networks

The mutual interference induced by the hybrid links can bring the secrecy gain for device-to-device (D2D) communication underlaying cellular networks, where there have been few works on studying its impact on the secrecy performance of the accessed D2D pairs. In this paper, our aim is to mainly analyze the secrecy performance gain of the accessed D2D pair brought by the mutual interference. Firstly, an opportunistic D2D pairs selection scheme based on the wireless channel direction information (CDI) is proposed. The proposed scheme determines a set of candidate D2D pairs with the required interference limitation for the cellular user. Then, the D2D pair with best channel condition is scheduled to share the same channel with cellular users for its own transmission. Further, the analytical expressions of the secrecy outage probability are derived with presence of multiple D2D pairs and multiple eavesdroppers. Finally, the secrecy performance of the proposed scheme is demonstrated by simulations.