摘要
数字下变频(DDC)是中频数字接收机的关键技术,通过将宽带大数据流变成窄带低数据流,以便DSP实时处理。本文提出一种基于多相滤波结构的正交数字下变频方案,通过计算机和DSP仿真,证明了它的可行性。
DDC(Digital Down Converter) is a key technology of IF digital receiver .Wideband high bit-rate digital signal can be transformed to narrowband low bit-rate digital signal with DDC technology,so it is possible to be processed by DSP in real time. A method of DDC based on polyphase filter is presented. The computer and DSP simulations show the feasibility of it.
