Fuchikami, Tomoki (The University of Osaka), Hirai, Takeshi (The University of Osaka), Wakamiya, Naoki (The University of Osaka)

Spatial Performance Analysis of NOMA-V2X with Cooperative Superposed Transmissions

Scheduled for presentation during the Regular Session "S10b-Cooperative and Connected Autonomous Systems" (WE-EA-T10), Wednesday, November 19, 2025, 14:10−14:30, Cooleangata 4

2025 IEEE 28th International Conference on Intelligent Transportation Systems (ITSC), November 18-21, 2025, Gold Coast, Australia

This information is tentative and subject to change. Compiled on October 19, 2025

Abstract

This paper analyzes the spatial distributions of the packet reception ratios (PRRs) in the vehicle-to-everything (V2X) with non-orthogonal multiple access (NOMA), called NOMA-V2X, with cooperative superposed transmissions (CSTs). To this end, this paper proposes an analytical model with the CSTs with an arbitrary number of interfering vehicles. In the proposed model, such vehicles transmit packets at the same time-frequency resource, and receivers try to decode those signals in a NOMA manner. Each vehicle performing the CST can transmit its own packet signal superimposed with another packet signal received in the previous time slot in a power domain. Our proposed analytical model has two key ideas for expressing the PRR of NOMA-V2X with CST. The first idea is to reflect the dynamic decoding order in the successive interference cancellation (SIC) based on the locations and numbers of interfering vehicles in NOMA-V2X. The second idea is to appropriately model the channel gain experienced by the superposed packet signal transmitted by a vehicle performing the CST. Our analysis showed that the NOMA-V2X with CST achieved up to 2.3 times larger areas with PRR over 0.9 than the NOMA-V2X without CST.