毕业设计论文
设计/论文题目：2FSK数字调制通信系统的毕业设计 班 级： 姓 名： 指导教师：
完成时间： 2009.12
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2FSK数字调制通信系统的设计
摘要
调制解调器是通信系统中的关键设备，其性能的好坏直接关系到整个系统的性能。本次设计的FSK调制系统具有抗干扰、抗噪声、抗衰减性能较强、技术复杂程度比拟低、本钱低等诸多优点，因而广泛应用与实际电路中。在中低速数据传输通信系统中得到了较为广泛的应用。此外，许多集成芯片里也用到了FSK调制技术。
本次设计的FSK电路可广泛用于计算机网络、办公自动化、远程自控系统与移频通信中。现代通信系统要求通信距离远、通信容量大、传输质量好。作为其关键技术之一的调制解调技术一直是人们研究的一个重要方向。从最早的模拟调幅调频技术的日臻完善,到现在数字调制技术的广泛运用,使得信息的传输更为有效和可靠.。采用FSK调制方式的主要优点是：①无需载波恢复，大大降低了系统复杂度。②对幅度的非线性抗干扰能力强。因为FSK信号为恒包络信号，其信息完全包含在信号的过零点上，所以比起调幅信号，其对幅度非线性抗干扰能力要强。③调制解调易用软硬件实现，简单易懂。
关键字：VHDL语言；2FSK调制；2FSK解调；MFSK调制
2FSK Digital modems municationSystem Design
Summary
Modem is the key equipment of munications system; its performance will have a direct effect on the performance of the whole system. The design of the FSK modulation system has advantages such as anti-jamming, anti-noise, high-attenuation performance, relatively low technical plexity and low cost, thus widely applying in actual circuit. It has been more widely used in the low-speed data transmission munication system. In addition, many integrated chip also used the FSK modulation technique.
The design of the FSK circuit can be widely used in puter networking, office automation, remote-controlled system and the frequency shift in munication. Modern munication systems require far distance munications, telemunications capacity, and transmission quality. As one of the key technologies of its modem technology has always been an important researching direction of people. From the earliest AM FM analog technology improving, and now digital modulation of
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2FSK数字调制通信系统的设计
