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在由模拟网向数字网过渡时期,研制数字微波通信系统时,应首先考虑波道频率配置要与模拟微波的频率配置相同,以利于数模共存;其次应考虑使微波收发信机数模两用。本文介绍一种新研究成功的2GHz QPSK 34Mb/s数字微波通信系统,它达到了七十年代末的国际水平。该系统所用的微波收发信机是在现已大量使用的2GHz全固体化300路模拟微波收发信机基础上改造而成的;采用了QDCPSK调制解调方式;采用了能吸收传播时廷的自适应无损伤倒换方式;远程监控系统带有智能终端,并有彩色屏幕显示及文件报表处理能力;公务系统性能完善,使用灵活。本文主要阐述系统设计及方案选择上的考虑,系统中主要设备的特点以及系统的主要特性和载噪比分配。
In the transition period from analog network to digital network, when developing digital microwave communication system, the frequency configuration of the channel should be considered to be the same as that of the analog microwave to facilitate the co-existence of the digital modules. Second, use. This article introduces a newly researched 2GHz QPSK 34Mb / s digital microwave communication system, which reached the international standards of the late seventies. The microwave transceiver used in this system is based on the 2GHz all-solidified 300-channel analog microwave transceiver which is now widely used. The QDCPSK modulation and demodulation method is adopted. Adapt to no damage switching mode; remote monitoring system with intelligent terminals, and color screen display and file reporting capabilities; official system performance, flexible use. This article describes the system design and program selection considerations, the main characteristics of the system as well as the system’s main features and carrier to noise ratio distribution.