Joint power allocation and user scheduling in integrated satellite-terrestrial cell-free massive MIMO IoT systems

Trinh Van Chien, Ha An Le, Ta Hai Tung, Hien Quoc Ngo, Symeon Chatzinotas

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)
19 Downloads (Pure)

Abstract

Both space and ground communications have been proven effective solutions under different perspectives in Internet of Things (IoT) networks. This paper investigates multiple-access scenarios, where plenty of IoT users are cooperatively served by a satellite in space and access points (APs) on the ground. Available users in each coherence interval are split into scheduled and unscheduled subsets to optimize limited radio resources. We compute the uplink ergodic throughput of each scheduled user under imperfect channel state information (CSI) and non-orthogonal pilot signals. As maximum-radio combining is deployed locally at the ground gateway and the APs, the uplink ergodic throughput is obtained in a closed-form expression. The analytical results explicitly unveil the effects of channel conditions and pilot contamination on each scheduled user. By maximizing the sum throughput, the system can simultaneously determine scheduled users and perform power allocation based on either a model-based approach with alternating optimization or a learning-based approach with the graph neural network. Numerical results manifest that integrated satellite-terrestrial cell-free massive multiple-input multiple-output systems can significantly improve the sum ergodic throughput over coherence intervals. The integrated systems can schedule the vast majority of users; some might be out of service due to the limited power budget.

Original languageEnglish
Number of pages17
Journal IEEE Internet of Things Journal
Early online date04 Jul 2024
DOIs
Publication statusEarly online date - 04 Jul 2024

Publications and Copyright Policy

This work is licensed under Queen’s Research Publications and Copyright Policy.

Keywords

  • alternating optimization
  • graph neural networks
  • Integrated satellite-terrestrial networks
  • Internet of Things
  • linear processing
  • Optimization
  • Resource management
  • Satellite broadcasting
  • Space-air-ground integrated networks
  • Throughput
  • throughput maximization
  • Uplink

ASJC Scopus subject areas

  • Signal Processing
  • Information Systems
  • Hardware and Architecture
  • Computer Science Applications
  • Computer Networks and Communications

Fingerprint

Dive into the research topics of 'Joint power allocation and user scheduling in integrated satellite-terrestrial cell-free massive MIMO IoT systems'. Together they form a unique fingerprint.

Cite this