Impact of Phase Noise and Oscillator Stability on Ultra-Narrow-Band-IoT Waveforms for Satellite

TL;DR

This paper analyzes how phase noise and oscillator stability affect ultra-narrow-band waveforms for satellite IoT, finding UCSS more robust against frequency drifts than LoRa, enhancing reliable remote communication.

Contribution

It provides a comparative analysis of LoRa and UCSS waveforms under phase noise and oscillator drifts, highlighting UCSS's robustness for satellite IoT applications.

Findings

UCSS is more robust against linear frequency drifts.

Phase noise impacts both waveforms but UCSS maintains better stability.

The study informs waveform selection for reliable satellite IoT communication.

Abstract

It has been shown that ultra-narrow-band (uNB) massive machine type communication using very compact devices with direct access to satellites is possible at ultra low rate. This enables global ubiquitous coverage for terminals without terrestrial service in the Internet of Remote Things and provides access to any satellite up to the the geostationary earth orbit. The lower data rate for waveforms providing uNB communication is set by the stability and the phase noise of the applied oscillators. In this paper we analyze the physical layer of two candidate waveforms, which are LoRa and Unipolar Coded Chirp-Spread Spectrum (UCSS) with respect to phase noise and oscillator frequency drifts. It is figured out that UCSS is more robust against linear frequency drifts, which is the main source of error for uNB transmissions.