Performance Analysis of NOMA-V2V Cooperative Systems with Outdated CSI and Imperfect SIC

In this paper, a non-orthogonal multiple access vehicle-to-vehicle (NOMA-V2V) cooperative system model is proposed. The outdated channel state information (CSI) is derived based on the three-dimensional two-cylinder channel model. The residual interference is derived using outdated CSI to characterize the degree of successive interference cancellation (SIC), i.e., perfect SIC and imperfect SIC.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 allocation scheme is proposed to maximum the sum achievable rate of NOMA-V2V cooperative system under consideration of residual interference. The corresponding power allocation scheme of OMA-V2V cooperative system is proposed. And achievable rates and outage probabilities of the NOMA-V2V and OMA-V2V cooperative systems are derived. The effects of power allocation coefficient, imperfect SIC, transmission power and the distance between transmitting and receiving ends on the achievable rates and outage probabilities are analyzed for the NOMA-V2V cooperative system. These results are compared with the OMA-V2V cooperative system. It provides theoretical guidance for V2V cooperative network to choose which multiple access method.