Improvement and realization of digital demodulation algorithm for FM signals

Liu Li; Xiang Xin; Sun Ye; Wang Feng

doi:10.13756/j.gtxyj.2012.04.004

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Improvement and realization of digital demodulation algorithm for FM signals

- Improvement and realization of digital demodulation algorithm for FM signals
- Study on Optical communication Issue 4, Pages: 26-28(2012)
- 作者机构：
  
  空军工程大学工程学院
- 作者简介：
- 基金信息：
- DOI：10.13756/j.gtxyj.2012.04.004
  CLC： TN763
- Published：2012，
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[1]刘立,向新,孙晔,王锋.FM信号数字化解调算法的改进与实现[J].光通信研究,2012(04):26-28+63.

Liu Li, Xiang Xin, Sun Ye, et al. Improvement and realization of digital demodulation algorithm for FM signals. [J]. (4):26-28(2012)
[1]刘立,向新,孙晔,王锋.FM信号数字化解调算法的改进与实现[J].光通信研究,2012(04):26-28+63. DOI： 10.13756/j.gtxyj.2012.04.004.

Liu Li, Xiang Xin, Sun Ye, et al. Improvement and realization of digital demodulation algorithm for FM signals. [J]. (4):26-28(2012) DOI： 10.13756/j.gtxyj.2012.04.004.

摘要

针对FM（调频）信号数字化解调中叉积鉴频法存在占用资源大、精度低和只适用于窄带信号解调的缺点

采用了一种改进的解调算法

该算法通过改变对I路和Q路信号的处理方法

避免计算近似反正切值

最大限度降低了算法复杂程度

实现了占用资源小、精度高和满足窄带和宽带信号的解调。经MATLAB软件仿真并利用Quartus II 11.0软件基于Cyclone III芯片设计仿真

验证了该算法是可行的。

Abstract

In view of the disadvantages of the cross product frequency discrimination method for FM signal digital demodulation

such as excessive occupation of hardware resource

low accuracy and limited application to narrowband signal demodulation only

this paper adopts an improved algorithm

which avoids computing the approximate the inverse tangent value and reduce to the maximum the algorithm complexity by changing the processing of the signals in I and Q channels

thus realizing the demodulation with less occupation of resource

higher accuracy and suitability for both narrowband and broadband FM signals.Simulation by Matlab and implementation on the platform of Quartus II 11.0 software based on the Cyclone III chips verify the feasibility of this algorithm.

关键词

数字化解调多相滤波正交变换现场可编程门阵列

Keywords

digital demodulationpolyphase filterorthogonal transformationFPGA

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