基于DSP Builder的数字调制器的设计

摘要

设计使用DSP Builder实现了基于现场可编程门阵列(Field-Programmable Gates Array,FPGA)的数字调制器.首先,在Simulink中采用DSP Builder的模块建立直接数字频率合成器(Direct Digital Synthesizer,DDS)子系统模型,根据它分别建立四相相移键控(Quaternary Phase Shift Keying,QPSK)和十六进制正交幅度调制(16-Quadrature Amplitude Modulation,16QAM)系统模型;然后使用Signal Compiler工具生成与其对应的HDL设计文件和TCL脚本;最后使用Quartus II和ModelSim共同完成功能和时序仿真.仿真结果表明该设计方法正确有效,可广泛应用于数字调制技术的FPGA实现.%FPGA-based digital modulator was implemented using DSP Builder. First, modules in Simulink/ DSP Builder were used to establish DDS subsystem model, then system models of QPSK and 16QAM modulators were built based on the DDS model respectively; next Signal Compiler was used to generate their corresponding HDL design files and TCL scripts; finally Quartus Ⅱ and ModelSim co-complete functional and timing simulation.The simulation results show that this design method was correct and effective, which can be widely used in the implement of digital modulation techniques on FPGA.