| 摘要: |
| 在多级调制识别系统中,首先需要区分调制方式是模拟调制还是数字调制。本文提出一种非线性变换方法对截获信号序列进行预处理,然后通过提取该序列的差分序列方差作为唯一的分类特征,就可以在较低信躁比条件下有效区分模拟和数字调制方式。这种非线性变换方法简单直接,所用特征少,并易于软件实现,尤其适合软件无线电等实时性要求高的应用领域。 |
| 关键词: 调制识别 非线性变换 模拟调制 数字调制 特征参数 软件无线电 |
| DOI：10.3969/j.issn.1001-893X. |
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| 基金项目:国家高技术研究发展计划(863计划) |
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| Differentiation of Analogue and Digital Modulated Signal Based on Nonlinear Transform |
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| Abstract: |
| In multi-step system for modulation recognition, the analogue modulation and the digital modulation should be distinguished at first. This paper employs a nonlinear transform method to preprocess the sampling sequence of the intercept signal, and then extract variance of the difference of it. It is efficient to differentiate them using the variance feature in low Signal-to-Noise Ratio(SNR), and it is easy to be software realized and is especially suitable to apply in the field of the software radio. |
| Key words: Modulation recognition,Nonlinear transform,Anologue modulation,Digital modulation,Feature parameter,Software radio |
