Digtal DownConverter is one of the core technologies of software radio, this paper introduces the principle of Digtal Down Converter, and discuss the realizable method based on FPGA in detail.

• 摘要数字下变频技术是软件无线电的核心技术之一，本文首先介绍了数字下变频器的原理，然后主要讨论了基于FPGA的数字下变频实现方法。