摘要
本文提出了一种对调频信号进行数字解调的方法。该方法利用DDS产生的数字正交载波将调频信号进行数字下变频,利用FIR抽取滤波器和数字微分器在基带进行信号处理,从而得到调制信号。仿真结果显示,该方法在较低信噪比环境下能够准确地恢复调制信号。
A digital quadrature demodulation method for Frequency Modulated （FM） signals is proposed.The received FM signal is first downconverted to baseband using digital quadrature carriers generated by DDS. Then a decimation FIR filter and a digital differentiator are used to obtain the modulating signal.Simulation shows that this method can accurately recover the modulating signal in low SNR circumstance.
出处
《电讯技术》
2005年第4期120-123,共4页
Telecommunication Engineering
关键词
数字信号处理
调频信号
正交解调
HR抽取滤波器
数字微分器
中频采样
Digital signal processing
FM signal
Quadrature demodulation
FIR decimation filter
Digital differentiator
IF sampling
