随着科学技术的发展,电子通信系统在各行业领域都得到了广泛应用,促进了国家经济的发展,提高了人们的生活水平。电子通信技术作为新型生产力对社会的发展起着非常重要的作用。电子通信系统的关键技术作为高端应用技术,其应用范围非常广泛,是衡量国家科技发展水平的主要标准。本文针对电子通信系统中的移动通信和卫星通信两个方面分析关键技术问题。 With the development of science and technology, the electronic communication system has been widely used in various fields and has promoted the development of national economy and raised people’s living standards. As a new type of productivity, electronic communication technology plays a very important role in the development of society. As a high-end application technology, the key technology of electronic communication system has a wide range of applications and is the main standard to measure the level of development of science and technology in the country. This article analyzes the key technical issues in two aspects of mobile communications and satellite communications in electronic communications systems.