Methods of measurement for equipment used in digital microwave radio transmission systems - part 2 - 4 : measurements on terrestrial radio - relay systems ; transmitter receiver including modulator demodulator 数字微波无线电传输系统使用设备的测量方法.第2 - 4部分:地面无线电中继系统的测量.包括调制器解调器的发射机接收机
The ring bell detector and the circuit which can simulate picking up the telephone have been set up in the pci demodulator . thus , automatic connection from terminal to center has been realized 现场数据采集及发送系统中设置了自动拨号电路，解调器中设置了振铃检测、模拟摘机电路，从而实现了终端到中心的自动连接。
In chapter 3 , the algorithm of modulation and demodulation has been given . in chapter 4 , it introduces the hardware frame of the modem , which includes some chips ’ introduction and the implementation of some key circuit 第四章详细介绍了通用调制、解扩解调器的硬件平台的设计,包括所用的主要芯片,一些关键电路的设计。
Methods of measurement for equipment used in digital microwave radio transmission systems ; part 2 : measurements on terrestrial radio - relay systems ; section 4 : transmitter receiver including modulator demodulator 数字微波无线电发射系统使用设备的测量方法.第2部分:地面无线电中继系统的测量.第4节:发射机接收包括调制器解调器
At first the article puts forward the scheme for system design , then introduces the design of baseband demodulator with ad6652 and the main features of ad6652 , and gets the experimental spectrum at the end 文中首先提出总体设计方案，然后介绍了ad6652为核心的基带解调器设计方案及此芯片的性能，最后通过对硬件电路的实验验证，得到了实验频谱。
Methods of measurement for equipment used in digital microwave radio transmission systems - part 2 : measurements on terrestrial radio - relay systems - section 4 : transmitter receiver including modulator demodulator ; amendment 1 数字微波无线电发射系统使用设备的测量方法.第2部分:地面无线电中继系统的测量.第4节:发射机接收包括调制器解调器.修改件1
Secondly , the noise of the system is analyzed . to improving the signal - to - noise of the system , design the phase sensitive demodulation system which contains three parts : signal channel , reference channel and correlation demodulator 其次,分析了系统各部分的噪声,以提高系统信噪比为原则,设计了由信号通道、参考通道、相关解调器三部分组成的相敏检波系统。
The system design of the digital signal processor ( dsp ) and the development of dsp are briefly introduced in this paper . and designed of the hard ware and soft ware of full digital bpsk demodulator through dsp and fpga 本文简要描述了数字信号处理器( dsp )的系统设计及dsp的发展过程，并运用dsp和用户现场可编程门阵列( fpga )实现了全数字bpsk解调器的硬件及软件设计。
Here we try out a hard way with video card to realize it . in the second place , we discuss some ways of digital modulation in transmission of image data , for example bpsk , qpsk , qam , and so on 随后，针对qpsk ，详细讨论了其基本原理和具体的实现算法，并进行了仿真验证，然后选用hsp50215数字上变频芯片和hsp50214b数字下变频芯片，设计了数字调制、解调器的实现方案。
