Power Allocation of Relay-Aided NOMA V2V System with Imperfect SIC

In this paper, a relay-aided non-orthogonal multiple access (NOMA) vehicle-to-vehicle (V2V) system model is proposed. The outdated channel state information (CSI) is derived based on the three-dimensional two-cylinder channel model. And the residual interference is derived using outdated CSI to characterize the degree of successive interference cancellation (SIC), i.e., perfect SIC and imperfect SIC. A power distribution scheme was presented to maximum the sum achievable rate of relay-aided NOMA-V2V system under consideration of residual interference. The effects of power allocation coefficient, imperfect SIC, transmission power ends on the achievable rates are analyzed for the relay-aided NOMA-V2V system. It provides theoretical guidance for V2V network on which multiple access method should be chosen.