本文从设计原理和硬件结构两个方面对FIR内插滤波器的设计与实现方法进行了分析。以降低硬件开销和提高处理速度为目标 ,提出了基于子滤波器时分处理的多相滤波器设计方法 ,并针对具体器件就算法的实现进行了讨论。最后 ,以第三代移动通信系统WCDMA中基带成形滤波器为实例比较了几种方法之间的差异 This article from the design principle and the hardware structure of the FIR interpolation filter design and implementation methods are analyzed. In order to reduce the hardware overhead and improve the processing speed, the design method of polyphase filter based on the sub-filter time-division processing is proposed, and the implementation of the algorithm is discussed according to the specific device. Finally, the third generation mobile communication system WCDMA baseband shaping filter as an example to compare the difference between several methods