| 软件无线电中CIC滤波器的性能改进 |
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| 引用本文： | 黄联芬,程恩.软件无线电中CIC滤波器的性能改进[J].厦门大学学报(自然科学版),2004,43(5):640-642. |
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| 作者姓名： | 黄联芬 程恩 |
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| 作者单位： | 厦门大学电子工程系,福建,厦门,361005 |
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| 基金项目： | 福建省自然科学基金(A0210001)资助 |
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| 摘 要： | 由于传统的CIC滤波器调谐参数固定且受限,频谱响应不理想,不能灵活运用于软件无线电中.通过分析传统的CIC滤波器结构和功率谱密度,提出一种改进型的CIC滤波器.改进型CIC滤波器每级采用不同延时,使其灵活调谐.通过MATLAB进行仿真,并调节参数,由于折叠进入通带,可使改进型的CIC滤波器在零点附近区域引起的镜像混叠减至最小,得到较好的旁瓣抑制和镜像衰减,证明其性能更优.
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| 关 键 词： | 积分梳状CIC滤波器 软件无线电 数字上/下变频器 |
| 文章编号： | 0438-0479(2004)05-0640-03 |
| 修稿时间： | 2003年12月10 |
Improved Performance of CIC Filter in Software Define Radio |
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| HUANG Lian-fen,CHENG En.Improved Performance of CIC Filter in Software Define Radio[J].Journal of Xiamen University(Natural Science),2004,43(5):640-642. |
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| Authors: | HUANG Lian-fen CHENG En |
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| Abstract: | The conventional cascaded integrator-comb (CIC) filter has limited number of tuning parameters,which are fixed at the same time,and its frequency response is not desirable.As a result,CIC is not suitable for software-defined radio (SDR).In this paper,based on the analysis of the filter structure and power spectrum density of CIC,we propose a modified CIC filter which different delay in each CIC filter comb stage.These parameters can be easily tuned to minimize the mirror-image aliasing part around the zeros of the modified CIC filters,which enters the pass band because of folding,it can provide better side-lobe suppression and mirror-image attenuation.Using simulation of MATLAB,we show that the modified CIC filter outperforms the conventional filter. |
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| Keywords: | CIC filter SDR DDC/DUC |
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