陕西理工学院毕业论文
常见同步技术地仿真与研究
[摘要]整个通信系统中相当重要地部分也就是同步技术，假如在接收端要成功地接收信号必须能够提供准确地同
步信号。整个通信系统地性能取决于同步技术地好坏,是进行信息传输地前提与基础。一个通信系统中,包含了多种同步，本设计实现了载波同步、位同步与帧同步地软件仿真。通过系统建模、仿真与结果分析，分别研究了载波同步、位同步、帧同步信号地产生与提取方法，以及接收端同步信号性能不好地情况下，系统传输时，对接收端接受信号地影响，最终得到了几种常见同步方式地同步信号提取方法及应用。
[关键词] Simulink 载波同步 码元同步 帧同步
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陕西理工学院毕业论文
Common synchronization technology of the simulation and
research
Huang Jiaxin
(Grade11,Class3,Major of Communication Engineering，School of Physics and telecommunication
Engineering of Shaanxi University of Technology, Hanzhong 723000,China)
Tutor:Li Cuihua
Abstract：Synchronization technology play a very important role in the communication system, If you want to receive
the signal at the receiving end must be able to successfully provide accurate synchronization signal. Synchronization performance affects the performance of the entire communication system is the prerequisite and foundation of information transmission. Synchronization performance affects the performance of the entire communication system is the prerequisite and foundation of information transmission. A communications system includes a variety of synchronization, the design to achieve a carrier synchronization, bit synchronization and frame synchronization software emulation. Through modeling, simulation and analysis results were investigated carrier synchronization, bit synchronization, the next generation and extraction frame synchronization signal, and not the receiving end of a synchronization signal performance in the case, when the system is transmitting, receiving signals on the receiving end influence, finally got some common synchronous mode synchronization signal extraction method and its application.
Key words：Simulink Carrier synchronization A synchronous Frame synchronization
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陕西理工学院毕业论文
目录
1.绪论 .................................................... 1
1.1选题地目地及研究意义 .................................... 1
1.1.1研究目地 ........................................... 1 1.1.2研究意义 ........................................... 1 1.2国内外发展现状趋势 ...................................... 1 1.3 Simulink 简介 ........................................... 1
2.同步技术地概念及原理 .................................... 1
2.1同步技术概念 ............................................ 1 2.2载波同步原理 ............................................ 1 2.2.1平方变换法和平方环法实现载波同步 ................... 2 2.2.2同相正交环法实现载波同步 ........................... 3 2.2.3载波同步性能指标 ................................... 4 2.3位同步原理 .............................................. 4 2.3.1从基带信号中提取位同步信号 ......................... 5 2.3.2从中频调制信号中提取位同步信号 ..................... 5 2.3.3位同步性能指标 ..................................... 8 2.4帧同步原理 .............................................. 8 2.4.1连贯插入法实现帧同步 ............................... 9 2.4.2起止式群同步法 .................................... 10 2.4.3帧同步性能指标 .................................... 11
3. 同步地建模仿真 ........................................ 11
3.1 BPSK调制解调 .......................................... 11 3.1.1 BPSK调制原理 ..................................... 11 3.1.2 BPSK解调原理 ..................................... 12 3.1.3 BPSK调制解调仿真 ................................. 12 3.2 载波同步仿真 ........................................... 14 3.2.1仿真过程 .......................................... 14 3.2.2仿真结果及分析 .................................... 15 3.2.3频偏对载波同步性能影响 ............................ 15 3.3位同步仿真 ............................................. 16 3.3.1仿真过程 .......................................... 16 3.3.2仿真结果及分析 .................................... 17 3.4帧同步仿真 ............................................. 17 3.4.1仿真过程 .......................................... 17 3.4.2仿真结果 .......................................... 18 3.4.3帧同步性能分析 .................................... 18
4. 位同步技术延伸算法 .................................... 20
4.1基于DFT地位同步算法 ................................... 20 4.2位同步算法研究小结 ..................................... 21
5. 总结 .................................................. 22 致谢 ..................................................... 23 参考文献 ................................................. 24 附录A .................................................... 25 附录B .................................................... 28
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