Performance Analysis of Optimal Relay Selection for Urban Vehicles Based on Max-min Strategy

In this paper, a cooperative non-orthogonal multiple access (NOMA) vehicle communication system in urban scenarios is studied. Max-min optimal relay selection strategy is adopted to derive the closed-form expressions of channel capacity and interruption probability for the target vehicle users. In the simulation, the influence of relay number, road loss, power allocation and destination vehicle distance on the system is considered, and the proposed max-min optimal relay selection strategy is compared with three relay selection strategies, namely Max-SR, Max-RD and random relay. The results show that the proposed max-min optimal relay selection strategy achieves the better user performance of destination vehicle.