知识与财富的链接
在DDC工作原理的基础上,对其结构进行了模块化设计,在包括了多速率信号处理的同时,提出采用NDA（None-Data-Aided,非辅助数据）频偏估计算法的载波恢复改进DDC系统。在详细描述各模块的方案设计后,通过使用System Generator,完成改进后DDC系统在FRS（Family Radio Service,家庭无线电服务）中的应用仿真,验证了NDA频偏估计算法的正确性和可行性,表明了该系统在软件无线电接收机中的适用性。
Based on operation principles about digital down conversion, this paper designs its structure with modules, including multirate signal processing and carrier recovery with the NDA frequency offset estimation algorithm to improve DDC. The design of each module is stated in detail. By using a System Generator to complete the simulation of an improved DDC system, applying in FRS, the correctness and feasibility of the NDA algorithm is confirmed, and the serviceability of this system in SDR receiving set is expressed.
