| 数字下变频中抽取滤波器的设计 |
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| 引用本文： | 高媛菲.数字下变频中抽取滤波器的设计[J].桂林电子科技大学学报,2009,29(6):467-471. |
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| 作者姓名： | 高媛菲 |
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| 作者单位： | 桂林电子科技大学信息与通信学院,广西,桂林,541004 |
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| 摘 要： | 数字下变频是软件无线电的关键技术之一,数字下变频的实现关键在于抽取滤波器的设计与实现.针对输入到数字下变频系统中的信号采样率很高的问题,选用积分梳状(CIC)滤波器与半带(HB)滤波器这两种比较特殊的滤波器来完成下变频采样速率的抽取以及信号滤波.通过比较分析影响CIC滤波器的特性参数,选取了优化CIC滤波器性能的一组参数,对其进行设计.为了减小了滤波器的采样点数,降低滤波器的成本,避免出现频率特性中的突跳,选用最优等波纹法设计HB滤波器.基于Systemgenerator的设计仿真与基于FPGA芯片的硬件设计,均可以有效地验证算法,但前者降低了实验成本,缩短了实验周期,而且设计更加实用.
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| 关 键 词： | 积分梳状(CIC)滤波器 半带(HB)滤波器 |
Designing of a decimation filter based on digital down-converter |
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| GAO Yuan-fei.Designing of a decimation filter based on digital down-converter[J].Journal of Guilin Institute of Electronic Technology,2009,29(6):467-471. |
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| Authors: | GAO Yuan-fei |
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| Affiliation: | GAO Yuan-fei (School of Information and Communication Engineering,Guilin University of Electronic Technology,Guilin 541004,China) |
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| Abstract: | Digital down conversion is one of the key techniques of software radio.The design and realization of the decimation filters are key to digital down conversion.In connection with the high sample rate in digital down conversion,the two special filters CIC and HB are used for decimation and filtering.In light of an analysis of the parameters of CIC,a best group is selected to optimize and design CIC.The use of optimal equiripple for HB is to reduce the sample points of the filter,cut down the cost and avoid fr... |
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| Keywords: | Systemgenerator |
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