vhdl实训设计说明书.doc

实 训 设 计 说 明 书 学院：信息工程学院 班级：08电信2班 姓名： 学号： 指导老师： 目录 中英文摘要…………………………………………… 关键词…………………………………………………. 前言…………………………………………………… 设计原理、过程、内容……………………………… 程序分析…………………………………………….. 设计结果说明………………………………………… 设计总结……………………………………………… 参考文献………………………………………………. 程序附录………………………………………………. 摘要： 中文摘要：随着社会的不断发展，通信对我们来说越来越显得重要，对于通信技术来讲，通信的质量也就显的非常关键。通信的根本任务是如何保证远距离传输信息的正确性，由于信号是离散的，被噪声干扰后的信号只要没有超过门限，接收端就能够完全正确的判断出传输的信息；对于模拟传输系统，只要有稍微的干扰都会使传输的信息产生错误，也正是由于这样的原因，数字通信系统才能在各方面替代模拟通信系统，成为现代通信的最基本方式。为了便于区别信号与噪声，使通信信号不失真和不受干扰，往往给测量信号赋予一定特征。这就是调制的主要功能。调制就是用一个信号去控制另一个作为载波的信号，让后者的某一特征参数按前一信号变化。再将测量信号调制，并将它和噪声分离，放大等处理后，还要从已经调制的信号中提取反应被测量的测量信号，这一过程通过解调为了更好的利用通信信道的带宽，并使信号能够传输更远的距离，在数字载波通信中，我们采用三种调制方式，ASK、FSK、PSK。调制信号为二进制信号的调制称为二进制数字调制。本课题主要是数字频率调制又称频移键控（FSK），同时利益能够ise软件来实现对FSK系统的仿真和分析，从而通过运用模拟的视觉化得手段来实现达到调制解调的目的。 英文摘要：With the continuous development of society, communication become more and more important for us, for communication technology, communication will tell the quality of the show is critical. The basic task of the communication is how to guarantee the correctness of the long-distance transmission information, because the signal is discrete, after the signal noise as long as no more than threshold, the receiver can completely correct judgment out the information transmitted; For analog transmission system, as long as there is a little bit of interference can make the information transmitted errors, it was also because of this reason, digital communication system in all aspects to replace analog communications system, become the most basic way of modern communications. To facilitate the difference between signal and noise, make the communications signals not distortion and not suffer interference, often to measure the signal characteristics to certain. This is the main functions of the modulation. Modulation is to use a signal to control the other as a carrier signal, let the latter a characteristic param