2011毕设–论文–基于MATLAB的通信系统仿真程序设计—QPSK与同步–贺铮
附 录
河南科技大学本科毕业设计(论文)
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基于MATLAB的通信系统仿真程序设计
——QPSK与同步
摘 要
介绍了数字通信中的QPSK调制、同步和解调的原理,通过用MATLAB编写脚本程序对QPSK通信系统的发射、同步和接收过程的具体实现进行模拟仿真,并运行M文件绘出信 在理想信道和加噪信道中模拟传输时的时域图,并对各模块进行了频谱分析,所得到的结果与理论基本相符,对于理解QPSK系统的性能并在系统的实际应用上作进一步的设计,提供了有效的参考依据。
关键词：数字通信,MATLAB，QPSK，同步
Design and Simulation for QPSK System Based on MATLAB
Abstract
The introduction was done with the principle of the QPSK modulation，synchronize and demodulation in digital communications, a script was written by using MATLAB program to carry out a simulation of the QPSK communication system, which contains the concrete realization of transmit， synchronize and receive process. Base on the M file. The time domain diagram is drew separately when the signal transmits in the ideal channel and in the channel with noise, spectral analysis of each module is also done, the results obtained with theoretical results in the main, which provides an effective frame of reference for understanding the performance of QPSK systems, and the practical application in the system to make further designed.
This paper introduces the digit communication rationale of the QPSK and it history, The QPSK modulation which are widely used in current wireless communication, it also simulates the process through M- file programming with the powerful software-MATLAB, and shows the results of corresponding waveform and spectrum. And analyze it. Here I emphasize a kinds of method of synchronize, A kind of parallel demodulation model for QPSK signals is designed, and the modules of the model including timing synchronization, carrier synchronization are simulated. A method of is given. Especially, a new method called recoding for phase ambiguity
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