摘要
本文讨论了软件无线电接收机中数字下变频处理的高效算法和结构 ,其目的是在DSP中用软件完成数字下变频处理 ,这样可省去专用数字下变频器 (DDC)硬件集成电路 ,并增强中频处理的灵活性、适应性。文中指出将混频、抽取、滤波结合在一起完成将大大减少运算量 ,并分析了将CIC滤波器与内插的二阶多项式滤波器组合进行有效抽取滤波的设计方案 。
The main purpose of this paper is to analyze the efficient algorithm of DDC, so that the DDC process can be implemented in software on general purpose DSP and can afford greater flexibility. Combining mixing with decimating and filting can greatly reduce the amount of operations. A decimation filter for DDC is proposed and proved to be effective by simulation. The proposed decimation filter is a cascade of a CIC filter, an ISOP(Interpolated second-order polynomials), and an FIR filter.
出处
《电讯技术》
北大核心
2002年第5期27-31,共5页
Telecommunication Engineering
基金
华北航天工业学院科研基金资助项目
关键词
软件无线电
数字下变频器
内插二阶多项式
算法
接收机
Software radio
Digital down converter
ISOP(Interpolated Second-Order Polynomials)
Algorithm
