基于FPGA的FSK调制解调设计.doc

摘 要 FPGA是现场可编程门阵列(Field Programmable Gate Array)的简称。它具有可编程逻辑器件现场可编程的灵活性，又有门陈列器件功能强、高集成度和高速度的优点，因此已在现代通信系统设计中被越来越广泛的应用。 VHDL语言具有很强的电路描述和建模能力，能从多个层次对数字系统进行建模和描述，从而大大简化了硬件设计任务，提高了设计效率和可靠性。 论文着重使用VHDL语言对2FSK的调制与解调进行编程。在系统仿真中，用MAX+PLUSⅡ作为仿真平台，对2FSK信号进行了调制解调的仿真。调制方面用的键控法，解调方面用的相干解调进行解调。基于FPGA的2FSK调制与解调在MAX+PLUS II上实现，通过VHDL语言的编程，生成调制解调所需要的几个模块，以实现整个2FSK的调制解调系统。 本论文共分四章，第一章主要是介绍了FPGA的原理以及它的应用、发展现状，另外介绍了VHDL语言的特点；第二章较为详细的讲述了FSK调制和解调的原理，其中包括FSK的多种调制和解调，及功率谱密度的特点。第三章开始对2FSK调制解调系统的各个单元器件进行设计。第四章开头介绍了MAX+PLUS II这款软件，接着使用这款软件实现2FSK调制解调算法，其中包括对各个功能模块的算法编程和时序仿真。 本设计的目的不是为了产生一种优于前人算法的算法，而是部分使用前人的算法，在前人算法中加入自己对2FSK调制解调算法的理解，从而产生能用于本设计的非通用算法。 关键词：仿真，2FSK，VHDL，FPGA Abstract FPGA is the abbreviation for Field Programmable Gate Array.It has the flexibility of field programmable to the programmable logic devices,also have strong function, high level of integration and the advantages of high speed,these advantages are same with Gate Array devices.Therefore ,it has been more and more widely used in the modern communication system design. VHDL language has strong ability of circuit described and modeling, it can model and describe digital system in multiple levels,simplified the hardware design task, to improve the design efficiency and reliability. This paper mainly use the language of VHDL on programming modulation and demodulation of 2FSK. In the system simulation,using MAX+PLUSⅡ,to simulate modulation and demodulation of 2FSK. Modulation use keying method, demodulation use coherent demodulation method.Based on 2FSK modulation and demodulation of FPGA realizing on MAX+PLUSⅡ,through the VHDL language programming, producing some blocks of modulation and demodulation,realizing the whole 2FSK modulation and demodulation system. This thesis in chapter 4,The first chapter is mainly introduces he basic principle of FPGA and its application, development situation,also introduces the characteristics of the language of VHDL;the second chapter tells the details of FSK modulation and demodulatio