基于多相滤波高效宽带数字的变频设计及FPGA实现

An Efficent Aprroach for Wide Band Digital Down Conversion Based on Polyphase Fiter and Its FPGA Implementation

阐述根据带通采样定理,设计了一种基于多相滤波结构的数字正交下变频方法。首先对传统数字下变频原理进行分析,然后根据多速率信号处理理论推导并给出了基于多相滤波结构的宽带数字下变频的实现方法。仿真结果和FPGA实测结果证明方法的有效性。

This paper describes a novel DDC aprroach,which is based on polyphase filter,according to band-pass sampling and parallel computation.The traditional DDC structure is given firstly,the polyphase filter approach and structure is deducted based on multirate signal procssing.The validity of the proposed method is verified by matlab simulation and FPGA implementation results.