基于MATLAB的数字下变频器的设计与仿真应用  

Design and Simulated Application of Digital Down Converter Based on MATLAB

作　　者：范文晶[1] 王海[1] 周渭[1] 钱时祥[2] 江炜宁[2] 

机构地区：[1]西安电子科技大学测量与仪器系,陕西西安710071 [2]电子测试技术国家重点实验室,山东青岛266555

出　　处：《电子质量》2009年第3期37-40,共4页Electronics Quality

基　　金：国家自然科学基金(10703004)资助项目

摘　　要：文中应用软件无线电思想对数字下变频器中的几个关键技术进行了研究,对下变频各个模块所涉及到的CIC、HB、FIR等关键算法进行了讨论、提炼与总结,应用matlab软件设计了下变频器中的CIC、HB、FIR滤波器等核心模块,并将各模块融为一体从软件实现的角度完成了对系统的搭建和功能仿真。仿真结果表明,系统实现了对中频信号的下变频处理且无失真现象,大大减少了软件无线电系统数字信号处理的运算量和数据的存储量,极大地提高了系统的实时性。This paper studies some key technologies in digital down converter based on Software Defined Radio. About such key algorithms as CIC, HB, FIR of each module in down-conversion, discussion, abstraction end summarization are given in this paper. Using the MATLAB software, we design such core modules as CIC filter, HB filter and FIR filter of the digital down converter. And any module is put together so that system foundation is carried out and the system function is simulated in software, The resuits of the simulation shows that the system has achieved down-conversion of signal and has no distortion phenomena end has largely reduced the calculation quantity of digital signal process and storage quantity, which largely improve the real-time perfor-mance of system.

关 键 词：软件无线电 数字下变频器 数控振荡器 积分梳状滤波器 半带滤波器 

分 类 号：TN773[电子电信—电路与系统]