《基于FPGA的全数字QAM调制》-毕业论文.doc

基于FPGA的全数字调制 PAGE 2 PAGE 3 共 NUMPAGES \* MERGEFORMAT 3 页 基于FPGA的全数字QAM调制 摘 要 随着通信技术的发展加快，人们对通信的需求也越来越高，既要在业务方面能承载的更多，同时对信息的有效性和可靠性也提出的更高的要求。因此导致频率资源紧张，要在有限的带宽里传输更多更可靠的数据，提高频谱利用率成为了当前重要的课题。QAM（正交幅度调制）作为调制技术中的一种在当前的形式下更能满足我们的调制需要。QAM是一种将幅度和相位联合调制的技术。其调制信号的相位和幅度都带有基带信息。因此可以充分利用信号平面，从而提高了频谱的利用率。QAM在各种高速通信系统（ADSL DVB等）有着广泛的应用。 本文对基于FPGA的16QAM全数字调制进行了研究和验证。首先在QAM原理方面进行了阐述，然后对其调制性能做了进一步研究。最后分析提出基于FPGA的系统设计方案，用verilog实现设计。并仿真和下载验证。 微电子的高速发展使得FPGA的规模越来越大，为复杂的算法实现提供了硬件条件，同时对于设计人员来说采用FPGA设计有很大的自由度不用拘泥于寄存器等。而且EDA技术的发展使得很多仿真验证可以直接利用计算机实现为设计者提供的很大的方便。本次FPGA芯片采用altera公司cyclone II系列ep2c8q208c8型号。开发环境为quartus II 9.1。通过编程调试仿真后，配置到FPGA芯片中观察波形，达到预期效果。 关键词： 16QAM FPGA 基带成形 正交载波 Abstract With the development of information technology，people have a higher requirement on communication which means not only more business but also higher availability and reliability of information. So,our frequency resource is very nervous,in order to transfer more information in limit band,increaseing use ratio become out important lesson.QAM as one of the way of modulation is better than others.QAM is a kind of modulation which combine amplitude and phase,data exit in amplitude and phase of modulation single.so ,QAM can take full advantage of single plane,at the same time developing use ratio.QAM is widely used to high speed information system. In this paper, digital 16QAM modulation based FPGA is implemented.fist,QAM theory is described then we discuss about feature of QAM.last we analyse and propose how to design an system,which described by verilog,then bdownload and implemented. Micro-electronicss development make dimensions of FPGA become more and more big.which provide a good condition on complex algorithm.at the same time,the designer can not be limited by chip register,and EDA can make many simulation and analyse is done by computer,the FPGA chip we used is cyclone II series ep2c8q208c8 from ALTERA.development environment is quartus II 9.1,after programming and test