基于SystemView的2FSK调制解调器设计【参考】.doc

摘 要 目前，随着科学技术的迅猛发展，信息技术已成为促进社会发展的强大动力。通过广泛的传播与利用，信息才可显示其真正的价值。信息凭借着各种通信技术才得以传播。对于通信技术而言，通信质量的好坏对于信息传递至关重要。相对于模拟通信系统，数字通信系统在此方面具有更多的优点。为了使基带信号的功率谱搬移到较高的载波频率上和实现远距离传输通信，我们通常采用三种方法进行数字调制：相移键控（PSK）、频移键控（FSK）和幅移键控（ASK）。当调制信号为二进制数字信号的调制方式称为二进制数字调制，又可分为二进制相移键控（2PSK）、二进制频移键控（2FSK）和二进制幅移键控（2ASK）等多种基本类型。 本毕业设计主要通过System View软件，设计一个2FSK调制解调器，并用System View软件实现该调制解调器，从而对2FSK系统进行仿真，观察仿真并进行波形分析，分析2FSK的信号的调制解调方式和频谱特性，对2FSK的抗噪声性能分析从而进行系统的性能评价。 关键词：System View；2FSK; 调制；解调 Abstract At present, with the rapid development of science and technology, information technology has become a strong force to promote the development of society.Information can show its real value through extensive communication and utilization.It is the all kinds of communication technology that spread information.For communication technology, the communication quality is vital for information transfer.Compared with the analog communication system, digital communication system has more advantages in this aspect.In order to make the baseband signal power spectrum to a higher carrier frequency and realize remote transmission communication, We usually adopt three methods for digital modulation: phase shift keying (PSK)、frequency shift keying (FSK) and amplitude shift keying (ASK). When the modulated signal is a binary digital signals, we called binary digital modulation.Binary is divided into binary phase shift keying (2PSK)、binary frequency shift keying (2FSK)、binary amplitude shift keying (2ASK) and other basic types. This graduation design is mainly through the System View software, to design a 2FSK modem and to realize the modem by use of the System View software in order to the simulation of the 2FSK system,observe the simulation and analyse the waveform,analyse the methods of modulation and demodulation and the spectrum properties of 2FSK signal. Keywords:System View; 2FSK; Modulation; Demodulation；  第一章 绪论 4 1.1课题的来源 4 1.2课题的意义 5 1.3 System View系统 6 1.4主要研究内容 6 第二章 System View的介绍 7