摘要
该文基于快速卷积算法,提出一种适用于线性相位FIR滤波器的并行结构。该结构采用快速卷积算法减少子滤波器个数,同时让尽可能多的子滤波器具有对称系数,然后利用系数对称的特性减少子滤波器模块中的乘法器数量。对于具有对称系数的FIR滤波器,提出的并行结构能够比已有的并行FIR结构节省大量的硬件资源,尤其当滤波器的抽头数较大时效果更明显。具体地,对一个4并行144抽头的FIR滤波器,提出的结构比改进的快速FIR算法(Fast FIR Algorithm,FFA)结构节省36个乘法器(14.3%),23个加法器(6.6%)和35个延时单元(11.0%)。
Based on fast convolution algorithm, improved parallel FIR filter structures are proposed for linear-phase FIR filters where the number of taps is a multiple of parallelism. The proposed parallel FIR structures not only use fast convolution algorithm to reduce the number of sub-filters, but also exploit the symmetric coefficients of linear-phase FIR filter to reduce half the number of multiplications in sub-filter section at the expense of additional adders in pre-processing and post-processing blocks. The proposed parallel FIR structures save a large amount of hardware cost for symmetric coefficients from the reported parallel FIR filter structures, especially when the length of the filter is large. Specifically, for a 4-parallel 144-tap filter, the proposed structure saves 36 multipliers （14.3%）, 23 adders （6.6%）, and 35 delay elements （11.0%） from the improved Fast FIR Algorithm （FFA） structure
出处
《电子与信息学报》
EI
CSCD
北大核心
2014年第5期1151-1157,共7页
Journal of Electronics & Information Technology
基金
国家自然科学基金(61006027)
新世纪优秀人才支持计划(NCET-10-0297)资助课题
关键词
并行FIR滤波器
快速卷积
迭代短卷积
对称系数
Parallel FIR filter
Fast convolution
Iterated short convolution
Symmetric coefficients
