日本打算将２ＧＨｚ无线通信系统用于农村用户线是人们日常生活中的重要通信媒体。但是日前所用的用户线不适于山区、边远的海岛、特殊的地形，以及农村地区。尤其是遇到自然灾害，需要修复时更困难。为此，日本邮政省急于设法改善这一部分通信设施。从某种意义上讲，无线... Japan intends to use 2GHz wireless communication system for rural subscriber line is an important communication medium in people’s daily life. However, the subscriber lines used in the past are not suitable for mountainous areas, remote islands, special terrain, and rural areas. In particular, it is more difficult to repair a natural disaster. To this end, Japan’s postal province is eager to find ways to improve this part of its communications infrastructure. In a sense, wireless ...