A Zero-Sum Game-Based Secure and Interference Mitigation Scheme for Socially Aware D2D Communication With Imperfect CSI

Device-to-device (D2D) communication is the most evolving technology in fifth-generation (5G) networks. It allows direct communication of devices in the proximity-with or without the base station help. This achieves high gain and low latency in communication and improves the network spectral efficiency. Despite the aforementioned challenges, interference and eavesdropping (by a malicious node) on D2D links/pairs are significant challenges. An eavesdropper can decode the information exchanged between the D2D devices. To mitigate the issues mentioned above nonorthogonal multiple access (NOMA) technique is quite helpful even in social scenarios. NOMA mitigates the interference issues in D2D communication, which increases the signal-to-interference-plus-noise ratio (SINR). Further, we used a zero-sum game approach to improve the data security and minimize eavesdropper's security risk on the D2D pair. It achieves the goal of the D2D transmitter, i.e., maximize the message security. Simulation results prove the proposed zero-sum game-based system's superiority, considering average network sum rate and average channel secrecy capacity.