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一、概述本文介绍用数字回波调制方法实现的5C4800—Ⅰ型数传机,是供一个音频活路内传输4800比特/秒二进制数据传输设备。传输线路可为头线或不多于三个音频转接段链接的一级载波电话电路,传输距离不超过1千公里。它与数字终端机配合可以传输数字化的遥测信号,也可以直接与计算机连接传输4800比特/秒或2400比特/秒的数据信息。要求信息速率为4800比特/秒时,在不采用信道编码的情况下,希望误码率达到10~(-5)。要求发送机功耗小,运行可靠。发送机采用了四电平,k=3两对回波的数字回波调制方式,一次形成残余边带频谱,
I. INTRODUCTION This paper introduces 5C4800-Ⅰ digital transmission machine realized by digital echo modulation method, which is used to transmit 4800 bits / s binary data transmission equipment in an audio live channel. The transmission line may be a first-class carrier telephone circuit linked by a head line or not more than three audio switch sections, with a transmission distance not exceeding 1 km. It works with digital terminals to transmit digitized telemetry signals, or it can be connected directly to a computer to transmit 4800 bits per second or 2400 bits per second of data. When the required information rate is 4800 bits / sec, the bit error rate is expected to be 10 to (-5) without using channel coding. Request transmitter power consumption, reliable operation. The transmitter uses a four-level, k = 3 two pairs of echoes of the digital echo modulation, the formation of the residual sideband spectrum,