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.
翻译:过去十年来,对在电信中使用高频频带的兴趣大大增加,这主要是由于制订了新的高频军事电信标准,以及扩大了高频段数字广播,更具体地说,这些新标准使得能够以低成本实施数百公里或数千公里的连接,这意味着可以广泛采用。在巴西,这种通信可以用于偏远或难以进入的区域,如亚马逊雨林区域。除了在高频电信系统物理层方面技术的演变外,还大大发展了利用机器学习算法进行音和图像编码的技术,相信所有这些进展都将有助于在没有电信基础设施的地方利用高频频段进行通信服务。这项工作介绍了巴西最近将高频无线电用于数字连接的情况,描述了高频段电信系统开发所面临的挑战。