基于DSP Builder的数字下变频技术  

Digital down-conversion technology based on DSP Builder

作　　者：郑呈斌 谢君尧 李建奇[1] 蒋瑜[1] 

机构地区：[1]华东师范大学上海市磁共振重点实验室,上海200062

出　　处：《信息技术》2015年第5期44-47,共4页Information Technology

基　　金：国家自然科学基金资助项目(81271533)

摘　　要：数字下变频(DDC)是软件无线电的核心技术之一,其通过下变频和抽取可将高频数据流信号变成易于后端数字信号处理器(DSP)实时处理的低频低数据流信号。文中讨论数字下变频技术的实现原理,从基于FPGA技术的DSP应用出发,基于DSP Builder软件进行了数字下变频技术研究。并通过对自定义数字信号进行正交混频下变频和两级(CIC滤波器、FIR滤波器)抽取实验,证明了此技术的简单高效和较高实用价值。Digital down conversion （DDC） is one of core technologies of software radio, which converts high frequency data streams into low-frequency and low-speed data streams by digital down conversion and decimation technology, for easy subsequent real-time processing by DSP devices. This article discusses on the principle of digital down conversion. In terms of the application of DSP technology based on FPGA, presented the digital down conversion technology used DSP builder software. The simulation experiment of self-defined digital signals, processed by digital quadrature mixer down-conversion and the cascaded CIC and FIR filters, indicated that the digital down conversion technology based on DSP builder is efficient and has high practical value.

关 键 词：DSP BUILDER 数字下变频 NCO混频器 CIC滤波器 FIR滤波器 

分 类 号：TN773[电子电信—电路与系统]