基于systemview的qpsk全数字调制解调器的设计与实现.doc

石家庄铁道大学四方学院毕业设计 基于Systemview的QPSK全数字调制解调器的设计与实现 The QPSK Digital Modem Design and Implementation Based on Systemview 2指导教师签字 时 间 年 月 日 摘　要 数字调制解调技术在数字通信中占有非常重要的地位。当前在移动通信、卫星通信以及航天的测量跟踪控制中，应用比较多的数字载波调制解调技术就是多进制相移键控。其中，四相相移键控具有一系列的优点，比如抗干扰能力强，在恒参信道下，QPSK调制技术与FSK、2PSK、ASK调制技术相比，不但抗干扰能力强，而且能更经济有效的利用频带，因此被广泛应用于无线通信中，成为现代通信中一种十分重要的调制解调方式。 本文根据当今现代通信技术的发展，对QPSK信号的调制解调问题进行了分析。 文中研究了QPSK调制解调的原理，并用动态系统设计、仿真和分析软件ystemview进行系统仿真，对各个模块参数进行了设置，而且分析了仿真结果，并对载波相位变化的实现，串并转换的实现，中频数字下变频、载波同步、位同步等技术进行了详细的研究。 通过仿真实验的实现，证明了该系统满足设计要求，能够完成其系统的仿真，并能通过眼图、误码率来验证系统的性能，同时也证明了本设计具有一定的参考价值。 QPSK　systemview　调制解调仿真 Abstract Digital modulation and demodulation technology in digital communication plays a very important role in this year. In the current ,the mobile communications, satellite communications and space measurement tracking control, application more digital carrier demodulation technology is the MPSK. QPSK with a series of advantages, such as strong anti interference, Fixed parameters in the channel cases, The modulation technology of QPSK compare with other modulation technology such as FSK 2PSK ASK ,It is not only strong anti-interference ability, and can be more economic and effective use of frequency band，So it is widely used in wireless communication, modern communication and become a kind of very important demodulation method. This paper according to the development of the modern communication technology, and analyzes the demodulation of the QPSK signal. This paper studies the principle of demodulation of the QPSK, by using dynamic system design, simulation and analysis the software Systemview for system simulation, Each module parameters are set up, and analyzes the simulation results, and we make a detailed study of the realization of the carrier phase change, and Realize the serial data and parallel data conversion , intermediate frequency digital frequency conversion, carrier synchronization, a synchronous technology. Through the simulation test, the syste