| 一种调频信号数字正交解调方法 |
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| 引用本文： | 祝林啸,吴嗣亮. 一种调频信号数字正交解调方法[J]. 电讯技术, 2005, 45(4): 120-123 |
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| 作者姓名： | 祝林啸 吴嗣亮 |
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| 作者单位： | 北京理工大学,信息科学技术学院,北京,100081 |
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| 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。
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| 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 |
| 文章编号： | 1001-893X（2005）04-0120-04 |
| 收稿时间： | 2004-10-19 |
| 修稿时间： | 2004-10-19 |
A Digital Quadrature Demodulation Method for FM Signals |
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| ZHU Lin-xiao,WU Si-liang. A Digital Quadrature Demodulation Method for FM Signals[J]. Telecommunication Engineering, 2005, 45(4): 120-123 |
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| Authors: | ZHU Lin-xiao WU Si-liang |
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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. |
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| Keywords: | Digital signal processing FM signal Quadrature demodulation FIR decimation filter Digital differentiator IF sampling |
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