AmBC-NOMA-Aided Short-Packet Communication for High Mobility V2X Transmissions

TL;DR

This paper explores an AmBC-NOMA system for high-mobility V2X communications, deriving theoretical BLER expressions and demonstrating performance gains over traditional methods through numerical validation.

Contribution

It introduces a novel AmBC-NOMA framework for V2X, accounting for mobility and channel estimation errors, with analytical BLER results and performance comparisons.

Findings

AmBC-NOMA outperforms orthogonal multiple access in BLER.

Theoretical BLER expressions match simulation results.

System performance is influenced by mobility, channel estimation, and reflection efficiency.

Abstract

In this paper, we investigate the performance of ambient backscatter communication non-orthogonal multiple access (AmBC-NOMA)-assisted short packet communication for high-mobility vehicle-to-everything transmissions. In the proposed system, a roadside unit (RSU) transmits a superimposed signal to a typical NOMA user pair. Simultaneously, the backscatter device (BD) transmits its own signal towards the user pair by reflecting and modulating the RSU's superimposed signals. Due to vehicles' mobility, we consider realistic assumptions of time-selective fading and channel estimation errors. Theoretical expressions for the average block error rates (BLERs) of both users are derived. Furthermore, analysis and insights on transmit signal-to-noise ratio, vehicles' mobility, imperfect channel estimation, the reflection efficiency at the BD, and blocklength are provided. Numerical results validate the theoretical findings and reveal that the AmBC-NOMA system outperforms its orthogonal multiple access counterpart in terms of BLER performance.