自组织通信网络调制解调技术

自组织通信网络调制解调技术(论文12000字,外文翻译)
摘要：将移动通讯与计算机网络相联合会形成一种新的形式——移动自组织网络。移动自组织网络可以在没有基本的设备的情形下，使用移动终端的路由转发功能实行数据的通讯，进一步补充了在没有基本的网络通讯设备的情况下使用的弊端。目前，自组织网络的问题在于硬件的性能和信息处理过程中的巨大的计算量。原始的数据信号有模拟的和数字的两种形式。与此同时信号的调制方法也由模拟方式逐步的、广泛的向数字化形式转化。其中ASK、FSK、PSK是最基本的数字调制的方法。 MSK是2FSK的改善，2FSK虽然性能良好易于实现，同时也得到了广泛的关注，但是有一些不同之处。为了克服这些缺点，将2FSK做相应的改进发展成MSK。与此同时最小高斯频移键控（GMSK）相对于其他调制方法有着频谱紧密、相位包络相对稳定、抗噪声抗干扰实力强的特性，在移动通信场合得到普遍的关注。
关键词：自组织网络； MSK； GMSK；调制解调；Simulink;

The Modulation and Demodulation of Mobile self-organized network
Abstrct:Mobile self-organized network is a network combined mobile communication and computer network. The mobile self-organizing network can make use of the routing  transpond  function of data communication for the mobile terminal, in this way communication can be realized without infrastructure, which makes up the defects of the absence of network communication infrastructure. At present, the problems of self organizing network are that: performance of hardware and the huge amount of computation during the process of information processing. The original data signal has two forms which includes analog form and digital form. The modulation method of the signal, at the same time, is transformed from analog to digital. The basic digital modulation are: FSK, ASK, PSK. MSK is the improvement of 2FSK, which draws widely attention for its good performance and easy to achieve , but there are still some shortages. In order to overcome these shortcomings, the 2FSK will be improved and developed into MSK. At the same time, the minimum Gauss shift keying (GMSK) has the characteristics of compact spectrum, stable envelope and strong anti-interference ability, which is widely used in mobile communication situations.
Key word: self-organizing communication networks; modulation shift keying (MSK); the modulation Gauss shift keying (GMSK);modulation and demodulation;Simulink
 

目 录
1. 引言    1
1.1 绪论    1
1.2 自组织网络的研究现状及问题    2
1.3 设计的目的及任务要求    2
2.最小频移键控（MSK）信号的基本原理    3
2.1 最小频移键控（MSK）简介    3
2.2  MSK信号的基本原理    3
2.3 MSK的正交表示法    5
3. MSK信号的调制    6
3.1 MSK调制器的特点    6
3.2 利用正交调制法产生MSK信号    7
3.3 MSK信号的功率谱    9
4. MSK信号解调    9
4.1 相干和非相干解调的简单介绍    9
4.2 差分检测法    10
4.3 MSK信号的差分数字解调    11
5. GMSK调制    13
5.1 GMSK的原理    13
5.2 GMSK的调制原理    14
所以实现GMSK调制的关键是得到合理的高斯滤波器。    16
5.3 GMSK的解调    16
6. MSK调制与GMSK调制的性能比较    17
6.1 仿真建模    17
6.2 仿真实验    18
7.1 总结    31
7.2 展望    32
致谢    33