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摘要随着信息技术的高速发展，通信资源——信道变得越发紧缺，所以人们致力于提高信道利用率，争取用最小的带宽传输尽可能多的信息。最小频移键控（MSK）就是针对2FSK的频带宽度大，相位不连续等缺陷做出的改进。为了进一步使信号的功率谱密度集中和减小对邻道的干扰，人们在MSK调制前将矩形信号脉冲先通过一个高斯型的低通滤波器，这就是高斯最小频移键控（GMSK）。目前很多国内外的通信标准都采用了GMSK技术，如GSM、DECT、CDPD等。本论文文首先从理论上分析了MSK信号和GMSK信号的原理和基本性质，提出了一种MSK和GMSK调制方式的方案,然后，在用MATLAB建立起这两个模型并验证其为正确的基础上，又用QUARTUS对模型中的模块进行了仿真与研究。5582
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关键词 高斯最小频移键控 GMSK MATLAB QUARTUS
毕业设计论文外文摘要
Title The Study and Achievement of GMSK Technology Abstract
With the rapid development of information technology, the communication resource, channel, is becoming more and more scarce and precious. As a result, people are devoting themselves to improving the efficiency of channel utilization and trying to transfer as much information as possible with minimum bandwidth. Minimum shift keying (MSK) is improvement of 2FSK aimed at the defect of the wide bandwidth and the phase discontinuity. In order to of concentrate the signal power spectral density further and reduce the adjacent channel interference, people send the rectangular signals to a Gauss low-pass filter before the process of MSK modulation，which is called the Gauss minimum frequency shift keying ( GMSK ). At present, many communication systems have employed the GMSK, for instance, the GSM, DECT, CDPD. The dissertation includes an overview of the principal and the nature of MSK and GMSK signal，and then establishes the GMSK signal model in the MATLAB and verifies the model. At last, the dissertation elaborates the simulation and the study of GMSK in the QUARTUS.
Keywords Gaussian Minimum Shift Keying GMSK MATLAB QUARTUS
1 绪论 1
1.1 选题依据及意义 1
1.2 国内外研究现状及发展趋势 1
1.3 本文主要结构及研究内容 2
2 MSK信号的性质与调制原理 2
2.1 MSK信号的原理及性质 2
2.2 MSK信号的调制原理 2
2.2.1 MSK信号的产生 2
2.2.2 差分编码 2
2.2.3 串并转换 2
2.2.4 加权模块 2
2.2.5 MSK信号调制原理小结 2
3 GMSK信号的性质与调制原理 2
3.1 GMSK信号介绍 2
3.2 GMSK信号的原理及性质 2
3.3 GMSK信号的调制原理 2
4 结果仿真与分析 2
4.1 仿真及软件介绍 2
4.1.1 仿真介绍 2
4.1.2 MATLAB平台介绍 2
4.1.3 QUARTUS平台介绍 2
4.2 基于MATLAB平台的模型仿真与分析 2
4.3 基于QUARTUS平台的模块仿真 2
结 论 2
致 谢 2
参 考 文 献 2