摘要
针对数字下变频降速过程中由样值取舍带来的信号失真问题,通过DDC系统架构设计、符号样值提取误差分析以及信号平均功率算法推导的方法,设计了数字滤波、数据缓存、迭代求和、功率比较以及多路开关选择等最佳样值提取电路。星座图的MATLAB数据仿真结果显示矢量幅度误差从原先大约3%降低到0.5%,验证了样值提取技术设计的有效性。
In order to solve the problem of signal distortion caused by sample selection in the process of digital down converter speed reduction,the digital filter,data buffer,iterative summation,power comparison and multi-switch selection circuits are designed by the methods of DDC system architecture design,error analysis of symbol sample extraction and derivation of signal average power algorithm.The results of MATLAB data simulation of constellation map show that the error of vector magnitude decreases from about 3%to 0.5%,which verifies the validity of sample extraction technology.
作者
铁奎
刘小刚
TIE Kui;LIU Xiao-gang(The 41st Institute of China Electronics Technology Group Corporation,Bengbu 233010,China)
出处
《电子设计工程》
2019年第11期1-4,共4页
Electronic Design Engineering
基金
国家科技重大专项(2017ZX03001021)
关键词
免混频
最佳样值提取
数字下变频
平均功率法
矢量幅度误差
mixer-free
optimal sample extraction
digital down conversion
average power algorithm
error of vector magnitude
