On the Error Floor Evaluation of NOMA-Irregular Repetition Slotted ALOHA

TL;DR

This paper presents a tight analytical approximation for the packet loss rate in the error floor region of NOMA-based IRSA schemes, validated through simulations for IoT scenarios with random user behaviors.

Contribution

It introduces a simple analytical model for the error floor of NOMA-IRSA in IoT settings, accounting for finite length regimes and SIC, with validation against simulations.

Findings

Accurate packet loss rate approximation in the error floor region.

Strong agreement between analytical model and Monte-Carlo simulations.

Model effective across various channel loads, including high load scenarios.

Abstract

In this work, we provide a simple yet tight analytical approximation of the packet loss rate in the error floor region for a non-orthogonal multiple access (NOMA)-based irregular repetition slotted ALOHA (IRSA) scheme. Considering an Internet of Things (IoT) scenario, users randomly select both the number of replicas based on a designed degree distribution and the transmission power from predetermined levels, while successive interference cancellation (SIC) is performed at the receiver. Our derived packet loss rate expression in the finite length regime is promptly evaluated. Its accuracy is validated through Monte-Carlo simulations, demonstrating a strong match across channel loads, including those beyond the low load regime