通原课设---fsk通信系统的调制

课程设计任务书

学生姓名：专业班级：电信12班

指导教师：工作单位：信息工程学院

题目：FSK通信系统的设计

初始条件：

具备通信课程的理论知识；具备模拟与数字电路基本电路的设计能力；掌握通信电路的设计知识，掌握通信电路的基本调试方法；自选相关电子器件；可以使用实验室仪器调试。要求完成的主要任务：（包括课程设计工作量及其技术要求，以及说明书撰写等具体要求）

1、完成FSK移频数据传输电路的设计，实现基带信号的FSK

传输功能，收发波形一致。

2、完成系统中相关调制、传输以及解调模块电路的设计。

3、载波信号频率：256KHz、128KHz、峰值：5V；基带信号

为M序列，峰值为1V的方波。

4、安装和调试整个电路，并测试出结果；

5、进行系统仿真，调试并完成符合要求的课程设计书。

时间安排：

二十二周一周，其中3天硬件设计，2天硬件调试

指导教师签名：年月日系主任（或责任教师）签名：年月日

摘要

数字频率调制又称频移键控,二进制频移键控记作2FSK,数字频移键控是用载波的频率来传递数字信息，即用所传的数字信息控制载波的频率。2FSK信号是符号“1”对应于载频，“0”对应于另一载频的已调波形，而且之间的改变是瞬时完成的。从原理上讲，数字调频可用模拟调频法来实现，也可用键控法来实现，模拟调频法是利用一个矩形脉冲序列对一个载波进行调频，是频移键控通信方式早期采用的实现方式，2FSK键控法则是利用受矩形脉冲序列控制的开关电路对两个独立的频率源进行选通。键控法的特点是转换速度快，波形好，稳定度高且易于实现，故广泛应用。

随着电子计算机的普及，数字通信技术正在迅速发展，数字频率调制是数据通信中一种常见的调制方式，频移键控（FSK）方法简单，易于实现，并且解调不需恢复本地载波，可以异步传输，抗噪声和抗衰落性好，因此，FSK调制技术在通信行业得到广泛地运用，并且主要适用于低，中速数据传输。

由于FSK调制解调原理相对简单，作为通信原理的入门学，理解FSK后可以容易理解其他更复杂的调制系统，为以后的进一步发展打下基础。

关键词：FSK调制解调 Multisim仿真

Abstract

Digital Frequency modulation is also called Frequency Shift Keying, a binary Frequency Shift Keying (2 FSK, digital Frequency Shift Keying is to use the Frequency of the carrier to transmit digital information, which is the preaching of digital information carrier Frequency control. 2 FSK signal symbol is "1" corresponds to the carrier frequency, "0" corresponds to a carrier frequency modulated waveform, but also is the change between the instantaneous. In principle, to implement the digital FM available simulation method, keying method can be used to realize the simulation of FM method is to use a rectangular pulse sequence to frequency modulation of a carrier, is an early adoption of frequency shift keying communication way, 2 FSK keying method is to use the rectangular pulse sequence control switch circuit of two independent frequency source for gating. Keying method is characterized by fast conversion, waveform is good, high stability and easy to implement, so it is widely used.

With the popularization of computers, digital communications technology is developing rapidly, the digital frequency modulation is a kind of common data communication mode of modulation, frequency shift keying (FSK) method is simple, easy to implement, and demodulation does not need to restore the local carrier, can be asynchronous transmission, noise resistance and good resistance to decline, therefore, FSK modulation technology been widely used in the communications industry, and is mainly suitable for low and medium speed data transmission.

Because of the FSK modulation demodulation principle is relatively simple, as a primer to learn communication principle, understand can easily understand other more complicated after FSK modulation system, to lay the foundation for the further development in the future.

Key Words: FSK modulation demodulation Multisim simulation