| 无线电监测接收机中的DDC研究 |
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| 引用本文： | 李志军,安建平,孙磊.无线电监测接收机中的DDC研究[J].北京理工大学学报,2008,28(10):906-909. |
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| 作者姓名： | 李志军 安建平 孙磊 |
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| 作者单位： | 北京理工大学,信息科学技术学院电子工程系,北京,100081;北京理工大学,信息科学技术学院电子工程系,北京,100081;北京理工大学,信息科学技术学院电子工程系,北京,100081 |
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| 摘 要： | 提出了一种高效数字下变频器(DDC)实现方法. 基于4倍中频采样技术和多相抽取半带滤波结构改进的高效DDC实现结构,相当于仅使用了一个多相抽取半带滤波器实现了I,Q两路信号的输出,降低了运算复杂度,资源节省79%,功耗降低约60mW. 设计实例验证了该方法的正确性与高效性.
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| 关 键 词： | 数字下变频器 多相结构 半带抽取滤波器 4倍中频采样 |
| 收稿时间： | 2007/12/27 0:00:00 |
Digital Down Converter(DDC) in Radio Monitoring Receivers |
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| LI Zhi-jun,AN Jian-ping and SUN Lei.Digital Down Converter(DDC) in Radio Monitoring Receivers[J].Journal of Beijing Institute of Technology(Natural Science Edition),2008,28(10):906-909. |
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| Authors: | LI Zhi-jun AN Jian-ping and SUN Lei |
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| Institution: | Department of Electronic Engineering, School of Information Science and Technology, Beijing Institute of Technology, Beijing 100081, China;Department of Electronic Engineering, School of Information Science and Technology, Beijing Institute of Technology, Beijing 100081, China;Department of Electronic Engineering, School of Information Science and Technology, Beijing Institute of Technology, Beijing 100081, China |
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| Abstract: | An improved efficient implementation method of digital down converter(DDC) in radio monitoring receivers is presented.Based on the sampling technique in which the sampling frequency is 4 times as high as the intermediate frequency and the use of polypahse decimation half band filter architecture,the improved architecture of high-efficiency DDC can be realized by using just one polyphase decimation half band filter to acquire the outputs of in-phase and quadrature in some sense.The improved method decreases the complexity of computation,reduces the burden of calculation and accumulated error.Resources of FPGA is saved 79% and the power consumption of the system is reduced about 60 mW.One design example is given and the results proved the validity and efficiency of the improved DDC structure. |
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| Keywords: | digital down converter(DDC) polyphase structure half band decimation filter 4-times-IF sampling |
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