FIR滤波器的8路多相27子滤波器实现结构

摘要

高速FIR滤波器的8路多相直接分解实现结构的工作频率是单路串行实现结构的1／8，计算复杂度是单路串行实现结构的8倍。针对高速FIR滤波器的8路多相直接分解实现结构计算复杂度大这一问题，对FIR滤波器的多相并行实现结构进行了详细推导，提出了FIR滤波器的8路多相27子滤波器实现结构，提出的FIR滤波器的8路多相27子滤波器实现结构的计算复杂度是单路串行实现结构的3�375倍。 FPGA实验验证了提出的FIR滤波器的8路多相27子滤波器实现结构的优越性。%Compared with the one⁃way serial FIR filter,the operational frequency of implementation structure of direct 8⁃channel polyphase decomposition of high⁃speed FIR filter is decreased to 1/8,and eight times as much as its computational complexity.According to the problem that the implementation structure of direct 8⁃channel polyphase decomposition of high⁃speed FIR filter has enormous computational complexity,the detailed analysis of the parallel implementation structure of polyphase filter is derived,and the implementation structure of 8⁃channel polyphase FIR filter with 27 subfilters is proposed.The proposed implementation structure of 8⁃channel polyphase FIR filter with 27 subfilters has 3�375 times the computational complexity of that of one⁃way serial FIR filter.The FPGA implementation experiment proves the superiority of the proposed implementation structure of 8⁃channel polyphase FIR filter with 27 subfilters.