FPGAASK载波传输系统设计.docVIP

基于FPGA的ASK载波传输系统设计The design of ASK carrier transmission system based on FPGA Abstract: The development of modern Communication system enters on a new stage along with the appearance of VHDL and implement of ASIC. The method of ordinary transmission system design already could not meet the operation requirements. Because most of the real signal are band pass signal, it is necessary to use base band signal to modulate carrier wave and generate digital modulation signal to be transferred, thus the technology of the modulation and demodulation is the important methods of the modern communication. Based on the study of ASK carrier transmission system, the simulation on ASK modulation and demodulation has been designed based on FPGA. Firstly, the design of simulation on ASK carrier transmission system was chosen. Secondly, the required procedure has compiled, including base band signal producing, function of modulation and demodulation realizing. Finally, the simulation on the overall system was conducted. Then, the result mistake was analyzed and the design was improved. The result indicates the method of demodulation, which control the output of ASK by FPGA, is simple. The error code rate is low. The efficiency is improved. The efficiency of digital communication system is advanced and the cost is lowered. Key words: Amplitude-shift keying technology, Modulation, Demodulation, Error code 目 录 第1章 绪 论 1 1.1 课题背景 1 1.2 课题目的和意义 2 1.3 论文内容安排 3 第2章 方案的设计 4 2.1 方案涉及的技术 4 2.1.1 通信系统的调制解调技术 4 2.1.2 ASK调制解调技术 8 2.2 整体方案设计 13 2.3 本章小结 14 第3章 ASK调制系统软件仿真 15 3.1 调制系统仿真建模 15 3.2 调制程序 15 3.3 ASK调制系统仿真 17 3.4 仿真结果调试 18 3.5 本章小结 20 第4章 ASK解调系统软件仿真 21 4.1 解调系统仿真建模 21 4.2 解调程序 21 4.3 ASK解调系统仿真 22 4.4 仿真结果调试 23 4.5 本章小结 25 第5章 ASK调制与解调系统综合仿真 26 5.1 基带信号的输入 26 5.1.1 m序列简介 26 5.1.2 m序列的实现 27 5.2 综合仿真 29 5.3 仿真结果调试 30 5.4 本章小结 33 结 论 34 致 谢 35 参考文献 36 附录： 源程序 37 第1章 绪 论 1.1 课题背景 现代通信系统是时代生命线。现代通信已经不再是单一的电话网或电报文字通信网，而是一个综合的为多种信息服务的通信网。为适应世界性的政治与经济活动的需要，