This thesis studied msk modulation scheme which is a kind of digital method depending on the development of today ' s communication technologies 本文根据当今现代通信技术的发展，对信号的数字调制方式的一种? ? msk进行了研究和实验。
The second chapter makes an introduction of the fundamental theory of qam modulation & demodulation , also briefly describes the basic principle of pll 第二章主要介绍了qam数字调制解调技术和锁相环技术原理，是后续章节的理论基础。
Then , the paper introduces the math module and achieving method of software modulation and demodulation of common digital modulating signals used in telecontrol & telemetry system 接着介绍了遥控遥测常用的数字调制信号的软件调制解调的数学模型和实现方法。
After an overview of dvb transmission system , especially to the digital satellite video broadcasting receiver eda design method using dsm technique is introduced 然后就芯片设计的eda工具的发展和设计流程进行介绍。第二章介绍了数字调制和解调技术和锁相环的基础理论。
The recognition method for analogue modulations has less computational complexity , and the method for digital modulation has flexibility and can be easily extended to the coming modulation types 本文的模拟调制识别算法具有运算量小的特点，而数字调制识别算法具有较好的扩展性。
Then high frequency distinguished rate and much low spurs could be realized in a single loop pll frequency synthesizer to carry out many kinds of digital modulation and predigest the structure of many signal generators 并能方便实现各种数字调制,大大简化各种信号发生器的结构,成为一种先进的锁相频率合成方式,得到广泛的应用。
In view of project practice , alterable digital modulation in telecontrol system has been achieved with the help of chip fpga by means of software radio . it is also compared with the hardware method 结合工程需要，采用软件无线电的设计思想，在可重配置fpga器件的支持下实现遥控系统中可变数字调制并与基于dds的硬件实现方案进行了比较。
Chapters studies the automatic signal detection and modulation classification . a statistical method to detect the signal is presented and a method using statistical parameter to classify signal is studied and improved 第五章研究了信号的自动检测与自动识别问题，提出了一种信号自动统计检测方法，研究改进了基于参数统计自动识别数字调制信号的方法。
Here we try out a hard way with video card to realize it . in the second place , we discuss some ways of digital modulation in transmission of image data , for example bpsk , qpsk , qam , and so on 随后，针对qpsk ，详细讨论了其基本原理和具体的实现算法，并进行了仿真验证，然后选用hsp50215数字上变频芯片和hsp50214b数字下变频芯片，设计了数字调制、解调器的实现方案。
With the improvement of the technology , especially in the fields such as computer technology , data coding and compress , digital modulation and vlsi . , the world electronic information industry enter into the digital era 随着科学技术的进步，特别是计算机技术、数据编码与压缩技术、数字调制技术和超大规模集成电路技术的发展，全球迎来了电子信息产业数字化的新时代。
