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Deep learning (DL) is an effective method for achieving automatic modulation identification (AMI) technology. However,DL methods generally struggle to balance recognition accuracy and efficiency simultaneously. To address this,a lightweight AMI method based on enhanced multi-scale feature fusion is proposed. First,a lightweight multi-scale feature fusion module is designed,which efficiently extracts multi-scale features of modulation signals through a cross-scale convolutional structure,enhancing the model's ability to represent different signal features. Next,an adaptive feature enhancement module is constructed,combining depthwise separable convolution and attention mechanisms to adaptively learn channel weights of key features,highlighting important signal features while reducing interference from irrelevant ones. Finally,a differential balance classifier is designed to focus on recognizing subtle modulation patterns,enabling efficient classification. Experimental results show that the proposed method improves recognition accuracy by an average of 5.91%,reduces the number of parameters by approximately 8.5×105,and decreases iteration time per sample by 0.0624 seconds. Compared with the advanced models,it achieves higher accuracy,faster speed,and fewer parameters.
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深度学习(Deep Learning,DL)是实现自动调制识别(Automatic Modulation Identification,AMI)技术的有效方法,但通常难以同时兼顾识别精度和效率。为此,提出了一种增强多尺度特征融合的轻量化AMI方法。首先,设计了轻量化的多尺度特征融合模块,通过跨尺度卷积结构高效提取调制信号的多尺度特征,以增强模型对不同信号特征的表征能力;其次,构建了自适应特征增强模块,结合深度可分离卷积与注意机制,能够自适应地学习关键特征的通道权重,突出重要信号特征的同时减少无关特征的干扰;最后,设计了差异平衡分类器,通过聚焦细微调制模式的识别,从而实现高效分类。实验结果表明,所提方法在识别精度上平均提高了5.91%,参数量减少约8.5×105,单次迭代时间缩短0.0624 s,与对比的先进模型相比具备更高的精度、更快的速度和更少的参数量。
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吴长城 男,1998年生于福建建瓯,2021年获学士学位,现为硕士研究生,主要研究方向为无线通信、自动调制识别、深度学习。
孙晓川 男,1983年生于山东莱阳,2013年获博士学位,现为副教授,主要研究方向为无线资源管理、无线流量预测、深度学习。
余继科 男,2000年生于安徽阜阳,2022年获学士学位,现为硕士研究生,主要研究方向为无线通信、深度学习。
李莹琦 女,1984年生于河北唐山,2010年获硕士学位,现为副教授,主要研究方向为语义通信和蜂窝网络流量分析、资源分配。
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吴长城 男,1998年生于福建建瓯,2021年获学士学位,现为硕士研究生,主要研究方向为无线通信、自动调制识别、深度学习。
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吴长城 男,1998年生于福建建瓯,2021年获学士学位,现为硕士研究生,主要研究方向为无线通信、自动调制识别、深度学习。
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孙晓川 男,1983年生于山东莱阳,2013年获博士学位,现为副教授,主要研究方向为无线资源管理、无线流量预测、深度学习。
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余继科 男,2000年生于安徽阜阳,2022年获学士学位,现为硕士研究生,主要研究方向为无线通信、深度学习。
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余继科 男,2000年生于安徽阜阳,2022年获学士学位,现为硕士研究生,主要研究方向为无线通信、深度学习。
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李莹琦 女,1984年生于河北唐山,2010年获硕士学位,现为副教授,主要研究方向为语义通信和蜂窝网络流量分析、资源分配。
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李莹琦 女,1984年生于河北唐山,2010年获硕士学位,现为副教授,主要研究方向为语义通信和蜂窝网络流量分析、资源分配。
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2018:915-919., articleTitle=Deep neural network architectures for modulation classification, refAbstract=null)], funds=null, companyList=[AuthorCompany(id=1251226700965692358, tenantId=1146029695717560320, journalId=1251194772300279900, articleId=1251226693449499232, xref=null, ext=[AuthorCompanyExt(id=1251226700974080967, tenantId=1146029695717560320, journalId=1251194772300279900, articleId=1251226693449499232, companyId=1251226700965692358, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=College of Artificial Intelligence,North China University of Science and Technology,Tangshan 063210,China), AuthorCompanyExt(id=1251226700995052489, tenantId=1146029695717560320, journalId=1251194772300279900, articleId=1251226693449499232, companyId=1251226700965692358, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=华北理工大学 人工智能学院,河北 唐山 063200)])], figs=[ArticleFig(id=1251226704425992270, tenantId=1146029695717560320, journalId=1251194772300279900, articleId=1251226693449499232, language=EN, label=null, caption=null, figureFileSmall=KFqHQDYkgVyXPUDFDCghzw==, figureFileBig=l+/MNWsOQdWXo9NnCgdRxg==, tableContent=null), ArticleFig(id=1251226704509878354, tenantId=1146029695717560320, journalId=1251194772300279900, articleId=1251226693449499232, language=CN, label=图1, caption=
AMI的EMFFNet网络模型结构, figureFileSmall=KFqHQDYkgVyXPUDFDCghzw==, figureFileBig=l+/MNWsOQdWXo9NnCgdRxg==, tableContent=null), ArticleFig(id=1251226704702816348, tenantId=1146029695717560320, journalId=1251194772300279900, articleId=1251226693449499232, language=EN, label=null, caption=null, figureFileSmall=MUwyJ9ww8YVIXaw9s3Gj5Q==, figureFileBig=yTboD11BH65JuIFw7uuL9w==, tableContent=null), ArticleFig(id=1251226704811868258, tenantId=1146029695717560320, journalId=1251194772300279900, articleId=1251226693449499232, language=CN, label=图2, caption=
不同模型在不同SNR下的OA比较, figureFileSmall=MUwyJ9ww8YVIXaw9s3Gj5Q==, figureFileBig=yTboD11BH65JuIFw7uuL9w==, tableContent=null), ArticleFig(id=1251226704933503080, tenantId=1146029695717560320, journalId=1251194772300279900, articleId=1251226693449499232, language=EN, label=null, caption=null, figureFileSmall=vl209gtBgrNDIGOG9KGqCw==, figureFileBig=aYyQZIn1GBRBOHxZnZemmQ==, tableContent=null), ArticleFig(id=1251226705055137905, tenantId=1146029695717560320, journalId=1251194772300279900, articleId=1251226693449499232, language=CN, label=图3, caption=
不同模型在训练过程中的识别率变化对比, figureFileSmall=vl209gtBgrNDIGOG9KGqCw==, figureFileBig=aYyQZIn1GBRBOHxZnZemmQ==, tableContent=null), ArticleFig(id=1251226705193549940, tenantId=1146029695717560320, journalId=1251194772300279900, articleId=1251226693449499232, language=EN, label=null, caption=null, figureFileSmall=SmzSNGlucpq94MAnbXLyOg==, figureFileBig=bV6R5Jdu5NhOEGfHC4ihsQ==, tableContent=null), ArticleFig(id=1251226705273241722, tenantId=1146029695717560320, journalId=1251194772300279900, articleId=1251226693449499232, language=CN, label=图4, caption=
RML2016.10b数据集-4 dB信噪比下模型混淆矩阵, figureFileSmall=SmzSNGlucpq94MAnbXLyOg==, figureFileBig=bV6R5Jdu5NhOEGfHC4ihsQ==, tableContent=null), ArticleFig(id=1251226705352933505, tenantId=1146029695717560320, journalId=1251194772300279900, articleId=1251226693449499232, language=EN, label=null, caption=null, figureFileSmall=ZurlFm1UqPhlo/UpHMzAkw==, figureFileBig=uAOTPNpLaiO9HQ3H1fTo9w==, tableContent=null), ArticleFig(id=1251226705453596806, tenantId=1146029695717560320, journalId=1251194772300279900, articleId=1251226693449499232, language=CN, label=图5, caption=
RML2016.10b数据集12 dB信噪比下模型混淆矩阵, figureFileSmall=ZurlFm1UqPhlo/UpHMzAkw==, figureFileBig=uAOTPNpLaiO9HQ3H1fTo9w==, tableContent=null), ArticleFig(id=1251226705529094282, tenantId=1146029695717560320, journalId=1251194772300279900, articleId=1251226693449499232, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
| 数据集 | 参数配置 |
|---|
| 数字调制 | QPSK、PAM4、8PSK、BPSK、CPFSK、BFSK、QAM64、QAM16 |
| 模拟调制 | AM-DSB,WB-FM |
| 数据集大小 | 1200000 |
| 样本尺寸 | 2×128 |
| SNR范围/dB | [-20:2:18] |
| 样本格式 | IQ格式 |
| 标签 | 信噪比和调制方法 |
), ArticleFig(id=1251226705638146192, tenantId=1146029695717560320, journalId=1251194772300279900, articleId=1251226693449499232, language=CN, label=表1, caption=
数据集总结
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| 数据集 | 参数配置 |
|---|
| 数字调制 | QPSK、PAM4、8PSK、BPSK、CPFSK、BFSK、QAM64、QAM16 |
| 模拟调制 | AM-DSB,WB-FM |
| 数据集大小 | 1200000 |
| 样本尺寸 | 2×128 |
| SNR范围/dB | [-20:2:18] |
| 样本格式 | IQ格式 |
| 标签 | 信噪比和调制方法 |
), ArticleFig(id=1251226705738809494, tenantId=1146029695717560320, journalId=1251194772300279900, articleId=1251226693449499232, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
| 模型 | 核心贡献 | 对信号识别的关键作用 |
|---|
| VT-CNN2[4] | 提出直接从原始IQ数据学习的CNN架构 | 提高了低信噪比条件下的识别能力 |
| ResNet[17] | 引入残差连接的深度CNN | 缓解梯度消失,提升高信噪比下的识别精度 |
| CLDNN[16] | 结合CNN和LSTM的混合网络 | 同时捕获空间和时序特征,增强复杂调制模式识别 |
| MCLDNN[15] | 多通道学习框架(1D卷积、2D卷积、LSTM) | 多角度特征提取和融合,提高特征表示全面性 |
| DualNet[14] | CNN-LSTM双流结构 | 增强对调制信号时空特性的捕捉能力 |
), ArticleFig(id=1251226705852055703, tenantId=1146029695717560320, journalId=1251194772300279900, articleId=1251226693449499232, language=CN, label=表2, caption=
基线模型比较
, figureFileSmall=null, figureFileBig=null, tableContent=
| 模型 | 核心贡献 | 对信号识别的关键作用 |
|---|
| VT-CNN2[4] | 提出直接从原始IQ数据学习的CNN架构 | 提高了低信噪比条件下的识别能力 |
| ResNet[17] | 引入残差连接的深度CNN | 缓解梯度消失,提升高信噪比下的识别精度 |
| CLDNN[16] | 结合CNN和LSTM的混合网络 | 同时捕获空间和时序特征,增强复杂调制模式识别 |
| MCLDNN[15] | 多通道学习框架(1D卷积、2D卷积、LSTM) | 多角度特征提取和融合,提高特征表示全面性 |
| DualNet[14] | CNN-LSTM双流结构 | 增强对调制信号时空特性的捕捉能力 |
), ArticleFig(id=1251226705952719004, tenantId=1146029695717560320, journalId=1251194772300279900, articleId=1251226693449499232, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
| 模型 | OA/% | AMF1 | Kappa | 参数量/106 | 单样本迭代时间/s |
|---|
| VT-CNN2[4] | 55.94 | 0.5683 | 0.5104 | 2.83 | 0.015 |
| Resnet[17] | 63.34 | 0.6339 | 0.5927 | 0.15 | 0.028 |
| CLDNN[16] | 59.67 | 0.6010 | 0.5519 | 0.20 | 0.227 |
| MCLDNN[15] | 64.20 | 0.6429 | 0.6022 | 0.41 | 0.086 |
| Dualnet[14] | 64.37 | 0.6473 | 0.6041 | 1.15 | 0.021 |
| EMFFNet | 67.41 | 0.6740 | 0.6379 | 0.10 | 0.013 |
), ArticleFig(id=1251226706091131042, tenantId=1146029695717560320, journalId=1251194772300279900, articleId=1251226693449499232, language=CN, label=表3, caption=
仿真实验对比
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| 模型 | OA/% | AMF1 | Kappa | 参数量/106 | 单样本迭代时间/s |
|---|
| VT-CNN2[4] | 55.94 | 0.5683 | 0.5104 | 2.83 | 0.015 |
| Resnet[17] | 63.34 | 0.6339 | 0.5927 | 0.15 | 0.028 |
| CLDNN[16] | 59.67 | 0.6010 | 0.5519 | 0.20 | 0.227 |
| MCLDNN[15] | 64.20 | 0.6429 | 0.6022 | 0.41 | 0.086 |
| Dualnet[14] | 64.37 | 0.6473 | 0.6041 | 1.15 | 0.021 |
| EMFFNet | 67.41 | 0.6740 | 0.6379 | 0.10 | 0.013 |
), ArticleFig(id=1251226706187600037, tenantId=1146029695717560320, journalId=1251194772300279900, articleId=1251226693449499232, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
| 模型 | OA/% | AMF1 | Kappa | 参数量/106 | 单样本迭代时间/s |
|---|
| 单一尺度(2×3) | 63.86 | 0.6397 | 0.5985 | 0.10 | 0.010 |
| 单一尺度(2×5) | 66.34 | 0.6649 | 0.6261 | 0.10 | 0.011 |
| 单一尺度(2×7) | 67.08 | 0.67205 | 0.6342 | 0.10 | 0.012 |
| 未进行AEF | 64.28 | 0.6417 | 0.6031 | 0.03 | 0.010 |
| 未进行DBC | 65.38 | 0.6542 | 0.6153 | 0.10 | 0.013 |
| EMFFNet | 67.41 | 0.6740 | 0.6379 | 0.10 | 0.013 |
), ArticleFig(id=1251226706284069033, tenantId=1146029695717560320, journalId=1251194772300279900, articleId=1251226693449499232, language=CN, label=表4, caption=
不同模块的效果对比结果
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| 模型 | OA/% | AMF1 | Kappa | 参数量/106 | 单样本迭代时间/s |
|---|
| 单一尺度(2×3) | 63.86 | 0.6397 | 0.5985 | 0.10 | 0.010 |
| 单一尺度(2×5) | 66.34 | 0.6649 | 0.6261 | 0.10 | 0.011 |
| 单一尺度(2×7) | 67.08 | 0.67205 | 0.6342 | 0.10 | 0.012 |
| 未进行AEF | 64.28 | 0.6417 | 0.6031 | 0.03 | 0.010 |
| 未进行DBC | 65.38 | 0.6542 | 0.6153 | 0.10 | 0.013 |
| EMFFNet | 67.41 | 0.6740 | 0.6379 | 0.10 | 0.013 |
), ArticleFig(id=1251226706393120940, tenantId=1146029695717560320, journalId=1251194772300279900, articleId=1251226693449499232, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
| 模型 | OA/% | AMF1 | Kappa | 参数量/106 | 单样本迭代时间/s |
|---|
| 单尺度Conv2D | 57.81 | 0.5772 | 0.5313 | 0.09 | 0.012 |
| 多尺度Conv2D | 64.22 | 0.6425 | 0.6025 | 0.09 | 0.010 |
| 移除MFF | 57.74 | 0.5721 | 0.5305 | 0.08 | 0.011 |
| EMFFNet | 67.41 | 0.6740 | 0.6379 | 0.10 | 0.013 |
), ArticleFig(id=1251226706514755762, tenantId=1146029695717560320, journalId=1251194772300279900, articleId=1251226693449499232, language=CN, label=表5, caption=
MFF消融实验对比
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| 模型 | OA/% | AMF1 | Kappa | 参数量/106 | 单样本迭代时间/s |
|---|
| 单尺度Conv2D | 57.81 | 0.5772 | 0.5313 | 0.09 | 0.012 |
| 多尺度Conv2D | 64.22 | 0.6425 | 0.6025 | 0.09 | 0.010 |
| 移除MFF | 57.74 | 0.5721 | 0.5305 | 0.08 | 0.011 |
| EMFFNet | 67.41 | 0.6740 | 0.6379 | 0.10 | 0.013 |
), ArticleFig(id=1251226706615419061, tenantId=1146029695717560320, journalId=1251194772300279900, articleId=1251226693449499232, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
| 模型 | OA/% | AMF1 | Kappa | 参数量/106 | 单样本迭代时间/s |
|---|
Conv2D+ 注意力 | 66.06 | 0.6602 | 0.6229 | 0.10 | 0.013 |
| MHA | 64.39 | 0.6463 | 0.6042 | 0.08 | 0.011 |
| 移除注意力 | 63.82 | 0.6388 | 0.5980 | 0.03 | 0.010 |
| EMFFNet | 67.41 | 0.6740 | 0.6379 | 0.10 | 0.013 |
), ArticleFig(id=1251226706716082365, tenantId=1146029695717560320, journalId=1251194772300279900, articleId=1251226693449499232, language=CN, label=表6, caption=
AFE消融实验对比
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| 模型 | OA/% | AMF1 | Kappa | 参数量/106 | 单样本迭代时间/s |
|---|
Conv2D+ 注意力 | 66.06 | 0.6602 | 0.6229 | 0.10 | 0.013 |
| MHA | 64.39 | 0.6463 | 0.6042 | 0.08 | 0.011 |
| 移除注意力 | 63.82 | 0.6388 | 0.5980 | 0.03 | 0.010 |
| EMFFNet | 67.41 | 0.6740 | 0.6379 | 0.10 | 0.013 |
), ArticleFig(id=1251226708297334977, tenantId=1146029695717560320, journalId=1251194772300279900, articleId=1251226693449499232, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
| 模型 | OA/% | AMF1 | Kappa | 参数量/106 | 单样本迭代时间/s |
|---|
| 自适应平均池化 | 67.23 | 0.6731 | 0.6359 | 0.10 | 0.013 |
| 移除StdPool | 64.97 | 0.6546 | 0.6108 | 0.10 | 0.013 |
| EMFFNet | 67.41 | 0.6740 | 0.6379 | 0.10 | 0.013 |
), ArticleFig(id=1251226708397998280, tenantId=1146029695717560320, journalId=1251194772300279900, articleId=1251226693449499232, language=CN, label=表7, caption=
DBC消融实验对比
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| 模型 | OA/% | AMF1 | Kappa | 参数量/106 | 单样本迭代时间/s |
|---|
| 自适应平均池化 | 67.23 | 0.6731 | 0.6359 | 0.10 | 0.013 |
| 移除StdPool | 64.97 | 0.6546 | 0.6108 | 0.10 | 0.013 |
| EMFFNet | 67.41 | 0.6740 | 0.6379 | 0.10 | 0.013 |
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