文档介绍：摘要
随着无线通信频带日趋紧张,研究和设计自适应信道调制技术体制是建立宽带移动通信网络的关键技术之一。正交振幅调制技术(QAM)是一种功率和带宽相对高效的信道调制技术,因此在大容量数字微波通信系统、有线电视网络高速数据传输、卫星通信系统等领域得到了广泛应用。在移动通信中,随着微蜂窝和微微蜂窝的出现,使得信道传输特性发生了很大变化。过去在传统蜂窝系统中不能应用的正交振幅调制也引起了人们的重视。
。然后利用Simulink对16QAM调制系统进行仿真,不但得到了信号在加噪前后的星座图、眼图,而且在信噪比变化条件下,得到了16QAM系统的误码率。最后,在简单做了一个2DPSK系统仿真之后,将它与16QAM系统进行了比较,并得出了16QAM是一种相对优越的调制解调系统这一结论。
关键词:QAM SIMULINK 仿真 2DPSK 误码率
ABSTRACT
The research and design of adaptable channel modulation system is one of the key techniques in building a broadband work with increasing shortage of munication frequency-band. Because quadrature amplitude modulation (QAM) is efficient in power and bandwidth, it has been used widely in field of large-capacity digital munication systems, high-speed data transmission cable work and munications, with the appearance of micro-and pico-cell,channel transmission characteristics have made great changes. The quadrature amplitude modulation which can not be applied to the traditional cellular systems in the past has also attracted much attention.
This article briefly introduce how QAM modulation and demodulation system and works. After a simulation of the 16QAM modulation system, we not only get the the signal constellation before and after adding noise, eye pattern, but also the BER with the changing conditions in the SNR. Finally, after a simple simulation of 2DPSK system,we made parition with the 16QAM system and get a conclusion that 16QAM is a relatively superior modulation and demodulation system.
Keywords: QAM Simulink Simulation 2DPSK BER
目录
第一章绪论 5
5
1. 2 SIMULINK 5
1. 3 SIMULINK与通信仿真 6
第二章正交振幅调制 7
MQAM信号的星座图 7
2. 2 QAM的调制解调原理 9
2. 3 QAM的改进方案 11
第三章 SIMULINK概述 12
3. 1 SMULINK简介 12
Simulink的功能 12
Simulink的特点 13
Simulink的应用领域 14
3. 2 Simulink基本模块库介绍 14
Simulink的启动 14
Simulink的基本模块库介绍 15
Simulink简单模型的建立 17
Simulink仿真的