Cellular vehicle-to-everything (C-V2X) communications will play a pivotal role in the realization of connected and cooperative autonomous driving. Applications such as ve-hicle platooning benefit from sidelink communications to fulfill stringent latency requirements at the cost of uncertainty in the reliability due to the multiple access interference. In this paper, we propose an analytical framework to model the performance of C-V2X sidelink communications in a vehicle platooning scenario, depending on the available resources, the number of interfering vehicles and their relative positions. A Nakagami-Lognormal composite channel model is assumed, and the moment matching approximation (MMA) is used to approximate the statistics of the signal-to-interference-plus-noise ratio (SINR). Compared to existing simulation studies in the literature, the proposed model offers a compact, yet accurate, approximation of the achievable performance in terms of packet success rate, and allows for planning and adapting the configuration and parameters setup of the vehicle platoon.
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