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本文简述了有线载波信道的干扰.介绍了模拟信道机的原理、技术性能及应用该机测试有线数传机的测试方法. 随着我国数字通信的日益发展,数字通信网将相继建立起来.我们的通信范围将随之大大扩充.不仅可以实现人与人之间的通信,同时可以实现人与机器,机器与机器之间的话音、数据、图象和文字等信号的传输. 由过去FDM制的通信发展成数字通信是一个巨大的飞跃.整个系统的网络规划,传输设备,传输信道,控制交换,计算机处理以及监测维护等都与FDM制系统大有不冈,有其独有的特点. 在目前的数字通信系统中,为了充分利用现有信道,大部分仍是采用现有的模拟通信网.从数字通信网的发展来看,信道是系统的重要组成部分之一.在选择发送端信号形式(最佳调制制度)和接收端恢复信号(最佳接收方式)的过程中,信道媒质所存在的干扰等因素必须加以考虑.因此,我们研究信道媒质所存在的干扰性质,对于数字通信网的建立是有价值的.只有我们了解和掌握了信道的干扰等特性,才可能设计和选择性能优良的调制解调器以及信源编码器、译码器,以使从信号传输的角度出发,确保数字通信网的正常运行. 本文将首先简述有线载波信道的干扰,后介绍一种供有线数传机室内测试用的一种模拟载波信道机的原理,测试方法以及该机的技术性能.
This article describes the interference of the cable carrier channel.It introduces the principle, technical performance of the analog channel machine and the test method of using this machine to test the wired data transfer machine.With the increasing development of digital communication in our country, the digital communication network will be established one after another. We will greatly expand the scope of communication. Not only can achieve the communication between people, but also can be achieved between people and machines, machines and machines between the voice, data, images and text signals transmitted by the past FDM The development of digital communication system is a huge leap forward.All of the system’s network planning, transmission equipment, transmission channels, control switching, computer processing, and monitoring and maintenance, and FDM system is not the slightest, has its own unique characteristics In the current digital communication system, in order to make full use of existing channels, most still use the existing analog communication network.From the development of digital communication network, the channel is an important part of the system.In the choice of sending Factors such as the interference present in the channel medium in the end signal form (best modulation scheme) and the receive end recovery signal (best receive pattern) must be taken into account , We study the interference properties of channel media and are valuable for the establishment of digital communication network.Only if we understand and master the channel interference and other characteristics, it is possible to design and select a good performance modem and source encoder So as to ensure the normal operation of the digital communication network from the perspective of signal transmission.This paper will first briefly describe the interference of the cable carrier channel and then introduce an analog carrier channel controller The principle, test methods and technical performance of the aircraft.