Exploiting non-orthogonal multiple access in device-to-device communication

This paper proposes an uplink non-orthogonal multiple access (NOMA) system with device-to-device (D2D) communication, enabling NOMA users to communicate other users/devices using D2D communication improve the capacity. In NOMA-D2D system, two cellular communicated BS NOMA, and simultaneously downlink NOMA. Closed-form solutions for ergodic sum capacity of proposed are derived analytically. The analytical results validated via simulations they compared obtained from conventional schemes. comparison shows that, in scenarios where efficient interference cancellation can be achieved, model achieve higher gains than benchmark When dB, achieves 192.2% 157.5% over OMA time-sharing-based respectively.