基于FPGA和DDS的数字调制信号发生器设计与实现

摘要

为了提高数字调制信号发生器的频率准确度和稳定度,并使其相关技术参数灵活可调,提出了基于FPGA和DDS技术的数字调制信号发生器设计方法.利用Matlab/Simulink、DSP Builder、QuartusⅡ3个工具软件,进行基本DDS建模,然后在DDS模块的基础上,通过单片机等电路组成的控制单元的逻辑控制作用,根据通信系统中数字调制方式的基本原理,设计并实现了数字调制信号发生器,从而实现二进制频移键控(2FSK)、二进制相移键控(2PSK)和二进制幅移键控(2ASK)3种基本的二进制数字调制.所得仿真结果表明设计方法的正确性和实用性.%In this paper, a design method of digital modulation signal generator based on FPGA and DDS technology is presented, in order to improve the frequency accuracy and stability of the digital modulation signal generator, and make its relevant technical parameters flexible and adjustable. The basic DDS is modeled by using three software tools: Matlab/ Simulink.DSP Builder and Quartus II, and then based on the DDS module, the digital modulation signal generator is designed and implemented according to the basic principle of the digital modulation scheme in a communication system, and by the logic control function of the control unit composed by the microcontroller and other circuit, thus three basic binary digital modulation: the binary frequency shift keying (2FSK), the binary phase shift keying (2PSK) and the binary amplitude shift keying (2ASK) are realized. The simulation results show the correctness and practicality of the design method.