Stochastic analysis of urban V2X communications: Orthogonality versus non-orthogonality

In this paper, we study the broadcasting performance of urban Vehicle-to-everything (V2X) communications at road intersections. such environments, dense buildings obstruct radio channel between vehicles in adjacent segments and Non-Line-Of-Sight (NLOS) signal propagation reduces received power level. Therefore, messages that originate from roads traveling a non-parallel direction usually have weaker signals than those segment parallel opposite direction. Besides, high vehicular density leads to insufficient orthogonal resources level interference. We propose apply Non-Orthogonal Multiple Access (NOMA) V2X intersections enhance spectrum efficiency improve Package Delivery Ratio (PDR) performance. With NOMA, multiple transmitters are decoded together interference undesired users can be canceled if these retrieved. Specifically, two NOMA-based communication schemes, namely, NOMA-V2X by Successive Interference Cancellation (SIC-V2X) Joint Decoding (JD-V2X). Based on tools developed stochastic geometry, derive compare PDR expressions for both NOMA schemes Orthogonal (OMA) scheme. Our results indicate 1) outperform conventional OMA scheme LOS/NLOS with two-user access increases 51%/369%; 2) four-user access, proposed shows 375% goodput enhancement as compared scheme; 3) JD-V2X provides significant SIC-V2X data rate regime. Finally, also demonstrate random based achieve lower transmission latency collision-free scheduling when is over 56% jammed.