软件无线电采样率转换中的CIC滤波器性能改进  

Improved Performance of CIC Filter in Sample Rate Conversion of Software Radios

作　　者：邸平[1] 王辉[1] 吴冬亮[1] 

机构地区：[1]南京工业大学信息科学与工程学院,江苏南京210009

出　　处：《计算机仿真》2006年第11期322-324,共3页Computer Simulation

摘　　要：该文描述了一种软件无线电采样率转换中的C IC滤波器性能改进的方法。软件无线电是具有高度灵活性、开放性的新一代无线通信系统;C IC滤波器实现简单,只用加减法就可以有效地执行采样率转换,而且具有较好的抗混叠和抗镜像性能,所以经常被应用于整数倍抽取和内插变换,传统的C IC滤波器是不适用于软件无线电的。该文通过分析传统的C IC滤波器结构特点以及目前已经存在的改进方法,通过控制改进型C IC滤波器的梳状滤波器级的延时,分析采样率转换因子和延迟序列的取值问题,合理的取值方案可以得到较好的旁瓣抑制和镜像衰减,并通过MATLAB进行仿真证明之。This paper describes a method for improving performance of Cascaded - integrator - comb CIC filter in sample rate conversion （SRC） of software radios. The software radio has high flexibility and open system of wireless communication. Conventional CIC filter can perform SRC efficiently using addition and subtraction. CIC （cascaded integrator - comb） filter has better mixing - resisting and image resisting performance. The conventional CIC filter is not suitable for software radios. This paper analyzes the structure of conventional CIC filter and existing modified method. By controlling the delay of CIC filter comb stage, this paper analyses the getting value of SRC and delay list. It can provide better side - lobe suppression and image frequencies attenuation using reasonable plan of getting value and it can be shown via MATLAB.

关 键 词：软件无线电 积分梳状滤波器 旁瓣抑制 抽取 内插 

分 类 号：TN713[电子电信—电路与系统]