Phân tích hiệu năng hệ thống V2V sử dụng NOMA trong điều kiện CSI và SIC không hoàn hảo

Abstract

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 The outdated channel state information (CSI) is derived based on the conventional channel model. The residual interference is derived using outdated CSI to characterize the degree of successive interference cancellation (SIC), i.e. imperfect SIC. A power allocation scheme is proposed to maximize the sum achievable rate of the NOMA-V2V cooperative system under consideration of residual interference. Achievable rates and outage probabilities of the NOMA-V2V and OMA-V2V cooperative systems are derived. The effects of the 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 networks to choose which multiple access method.