LoRa Backscatter Communications: Temporal, Spectral, and Error Performance Analysis

Ganghui Lin, Ahmed Elzanaty*, Mohamed Slim Alouini

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

LoRa backscatter (LB) communication systems can be considered as a potential candidate for ultra-low-power wide-area networks (LPWANs) because of their low cost and low power consumption. In this article, we comprehensively analyze LB modulation from various aspects, i.e., temporal, spectral, and error performance characteristics. First, we propose a signal model for LB signals that accounts for the limited number of loads in the tag. Then, we investigate the spectral properties of LB signals, obtaining a closed-form expression for the power spectrum. Finally, we derived the symbol error rate (SER) of LB with two decoders, i.e., the maximum likelihood (ML) and fast Fourier transform (FFT) decoders, in both additive white Gaussian noise (AWGN) and double Nakagami-m fading channels. The spectral analysis shows that out-of-band emissions for LB satisfy the European Telecommunications Standards Institute (ETSI) regulation only when considering a relatively large number of loads. For the error performance, unlike conventional LoRa, the FFT decoder is not optimal. Nevertheless, the ML decoder can achieve a performance similar to conventional LoRa with a moderate number of loads.

Original languageEnglish (US)
Pages (from-to)16412-16426
Number of pages15
JournalIEEE Internet of Things Journal
Volume10
Issue number18
DOIs
StatePublished - Sep 15 2023

Keywords

  • Internet of Things (IoT)
  • LoRa backscatter (LB)
  • power spectral density
  • symbol error rate (SER)

ASJC Scopus subject areas

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

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