2011年电子国赛E题简易数字信号传输性能分析仪.docxVIP

2011年全国大学生电子设计竞赛简易数字信号传输性能分析仪（E题）【本科组】2011年9月摘要眼图对于展示数字信号传输系统的性能提供了很多有用的信息：可以从中看出码间串扰的大小和噪声的强弱，有助于直观地了解码间串扰和噪声的影响，评价一个基带系统的性能优劣。眼图的形成是由于示波器的余辉作用，扫描所得的每一个码元波形将重叠在一起，从而形成眼图。本设计中使用可编程器件和线性移位寄存器设计成一个数字信号发生器，用来产生数字信号和伪随机信号。用低通滤波器模拟传输信道，并且把伪随机信号模拟为信道噪声。用FPGA以及一定的外围电路作为数字信号处理系统，提取位同步信号。我们把经过模拟信道后的数字信号传输给数字信号分析模块处理,最后通过示波器观察其眼图，以便对信号进行进一步的分析和调理。关键字：数字信号处理；伪随机信号；低通滤波；眼图AbstractEye diagram to display digital signal transmission system performance to provide much useful information: can also be seen from the crosstalk between the code size and noise intensity, contribute to the intuitive understanding of intersymbol interference and noise effects, evaluation of a baseband system performance. Eye formation is due to the persistence of oscilloscope, the scanned every symbol waveforms will overlap together, thereby forming the eye diagram. The design of using FPGA and linear shift register design into a digital signal generator, used to generate the digital signal and the pseudo random signal. With low pass filter is used as a transmission channel, and the pseudo random signal as channel noise. Using FPGA as well as some of the peripheral circuit as a digital signal processing system. We put after the analog channel after the digital signal is transmitted to the digital signal analysis circuit, finally through the oscilloscope to observe the eye, so that the signal for further analysis and conditioning.Keywords: digital signal processing; pseudo random signal; low pass filter; eyediagram目录第一章系统方案11.1 信号发生模块的论证与选择11.2 低通滤波器模块的论证与选择11.3数字信号分析方案论证与选择2第二章系统理论分析与计算32.1 低通滤波器的分析32.1.1 阶数的确定32.1.2 电阻、电容参数的确定。32.1.3 通带增益42.2 m序列数字信号的产生42.2.1 数字信号的产生42.2.2 伪随机信号的产生52.3 眼图显示方法62.3.1 眼图的概念62.3.2 眼图的意义62.3.3 眼图的显示72.4 同步信号提取7第三章电路与程序设计83.1电路的设计83.1.1系统总体框图83.1.2电源83.2程序的设计83.2.1程序模块83.2.2程序流程图8第四章测试方案与测试结果104.1测试方案104.1.1硬件测试104.1.2软件仿真测试104.1.3硬件软件联调104.2 测试条件与仪器104.3 测试结果及分析104.3.1测试结果(数据)104.3.2测试分析与结论13第五章结论15附录1：电路原理图17附录2：源程序18简易数字信号传输性能分析仪（E题）【本科组】第一章系统方案本次设计主要由信号发生模块、低通滤波器、控制部分、数字信号