Enlaces de r\'adio de longa dist\^ancia utilizando a banda de HF

TL;DR

This paper reviews recent developments in HF radio technology and its applications for long-distance digital communication in Brazil, highlighting technological advances and challenges in remote regions.

Contribution

It provides an overview of recent HF radio applications in Brazil and discusses technological challenges for deploying HF-based telecommunication systems.

Findings

HF band enables low-cost, long-distance communication links

Technological advances include new standards and machine learning techniques

Challenges involve infrastructure development and signal reliability

Abstract

The interest in the use of the HF band in telecommunication has increased significantly in the last decade, mainly due to the development of new standards for military telecommunications in HF, as well as the expansion of digital broadcasting in the HF band. More specifically, these new standards allow the implementation of links of hundreds or thousands of kilometers at a low cost, which suggests a widespread adoption can occur. In Brazil, this type of communication can be used in remote regions or regions of difficult access, such as the Amazon rain-forest region. In addition to the evolution of technologies concerning the physical layer of the HF telecommunication systems, there has been a great development of techniques that use machine learning algorithms for audio and image coding. It is believed that all these advances will enable the use of the HF band for communication services in places without telecommunication infrastructure. This work presents recent applications of HF radio for digital links in Brazil, describing the challenges present for the development of telecommunication systems in the HF band.