ACM信道化滤波器设计中的陷波问题分析研究  

Band Notch Problem of ACM Channelization Filter Design

作　　者：杨君[1,2] 袁嗣杰[1] 吕镜清[2] 

机构地区：[1]装备指挥技术学院航天测控工程研究中心,北京101416 [2]信息综合控制国家重点实验室,成都610036

出　　处：《宇航学报》2010年第12期2764-2770,共7页Journal of Astronautics

基　　金：国防科技重点实验室基金项目(9140C1006050703)

摘　　要：针对按照ACM(Adjacent Channel Merging)条件生成和信道滤波器存在陷波现象的问题,对和信道滤波器的频率响应进行了推导分析,提出了低通原型滤波器阶数必须为划分的子信道数偶数倍的附加条件从根本上消除了和信道的陷波现象;并在此基础上提出了先设计和信道滤波器再直接逆推出低通原型的设计方法,计算机仿真结果表明,与原有的基于单参数优化的迭代搜索算法相比,该方法能更好地控制和信道的滤波性能,保证和信道与子信道滤波性能的一致性,且计算过程无需迭代更为简单高效。To solve the band notch problem of ACM（Adjacent Channel Merging）channelization filters,the frequency response of the merging channel filter has been analysed and an additional condition that the order of the prototype filter must be even times number of subchannels is proposed,thus completely avoiding the band notch problem.On the other hand the additional condition causes a simple conversion relationship of amplitude frequency response between merging channel fiter and the prototype filter,so that the merging channel filter can be designed first,and then the prototype filter is developed based on the conversion relationship.In this way the flatness of merging channel band can be insured and a better conformability of filtering performance between the merging channel and subchannel can be achieved.The computer simulation proves that the new method is more efficient than iterative searching based on single parameter optimization.

关 键 词：信道化 调制滤波器组 频率特性 参数优化 LAGRANGE插值 

分 类 号：TN850[电子电信—信息与通信工程]