摘要
分析相关法和群时延法两种常用时延测量方法,对比了两种方法的应用场景。根据滤波器的群时延计算公式,仿真基于傅里叶变换测量滤波器时延的方法。在相同的同步信号下,利用该方法分别测量了系统输入信号和输出信号的时延,计算二者的差值,得到系统的时延结果,验证了该方法可用于通信系统时延测量的方案。根据测量的时延值,利用辛格函数的相位与时延之间的对应关系设计滤波器系数,对系统或信号间的时延差进行补偿处理,可达到期待的时延精度要求。
Two methods of time delay measurement, correlation method and group delay method, were analyzed. Their application scenarios were compared. According to the group delay formula of the filter, the method of time delay measurement based on Fourier transform was simulated. Using the same synchronization signal, the time delays of the input signal and the output signal of the system were measured by this method, and the difference between them was calculated. The result of the time delay of the system was obtained, which verified that this method can be used to measure the time delay of the communication system. According to the measured delay value, the filter coefficients were designed by the relationship between the phase and the time delay of the sinc function, and the time delay difference of the system or the signal is compensated to meet the expected delay accuracy requirements.
作者
杨丽
YANG Li(Shanghai Nokia Bell Co., Ltd., Nanjing Jiangsu 210037, China)
出处
《通信技术》
2019年第9期2167-2171,共5页
Communications Technology
关键词
时延测量
傅里叶变换
辛格函数
补偿
time delay measurement
fourier transform
sinc function
compensate
