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近年来数字微波无线中继通信系统的主要进展,在于研制远距离的大容量干线系统,以满足日益增长的容量要求。如日本于1977年9月在东京开始使用300公里长的100Mb/s的11/15S—P_2系统,和1980年加拿大将完成横跨东—西海岸长6500公里的91Mb/s的D’RS—8系统等远距离的大容量数字无线中继通信线路。实现大容量的数字微波中继通信系统的披术动向有: (1) 开发新的更高的频段,使得有更宽的带宽可供使用。但是,使用的频率越高,传播影响越显著,中继站间距会缩短,所以使用更高的频率与长跨距要求相矛盾。因此,使用
In recent years, the main progress of the digital microwave wireless relay communication system lies in the research and development of long-distance large-capacity trunk systems to meet the ever-increasing capacity requirements. For example, Japan started to use the 300-megawatt 100Mb / s 11 / 15S-P 2 system in Tokyo in September 1977 and will complete 91Mb / s D’RS-8 in Canada in 1980, 6500 kilometers long across the east-west coast Systems and other long-distance high-capacity digital wireless relay communication lines. To achieve high-capacity digital microwave relay communications system Phi trends are: (1) the development of new higher frequency band, making a wider bandwidth available. However, the higher the frequency of use, the more significant the effects of propagation, the shorter the distance between repeaters, so the use of higher frequencies contradicts the requirements of long spans. Therefore, use