| 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。 |
| 关键词: 数字信号处理 调频信号 正交解调 FIR抽取滤波器 数字微分器 中频采样 |
| DOI：10.3969/j.issn.1001-893X. |
| Received:October 19, 2004 |
| 基金项目: |
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| A Digital Quadrature Demodulation Method for FM Signals |
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| Abstract: |
| 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. |
| Key words: Digital signal processing,FM signal,Quadrature demodulation,FIR decimation filter,Digital differentiator,IF sampling |
