基于BLR并行结构的多模态调制识别方法OA

Aiming at the problem that existing convolutional neural network(CNN)-based modulation recognition methods are highly dependent on single modal data(e.g.,IQ sequences)and difficult to adequately extract multi-dimensional features of signals,in this study a multimodal parallel structural modulation recognition method was proposed based on bidirectional long short-term memory network(BiLSTM)and residual network(ResNet),termed the BiLSTM-ResNet(BLR network).Firstly,the temporal features of IQ data were extracted by BiLSTM in the upper branch,and the spatial features of constellation maps were extracted by ResNet-18 in the lower branch.Secondly,serial feature fusion was used in the decision fusion module to better exploit the complementary nature of the multimodal data.Lastly,the signal modulation styles were recognised with the help of the model's feature ex-traction capability.In this study,experimental validation was carried out on the publicly available dataset RML2018.01a.The experimental results showed that the overall recognition accuracy of BLR network in the 6-30 dB SNR interval was stable at 96.48%,2.61%and 3.91%higher than that of the single-modal ResNet and BiL-STM models,respectively,and 1.25%higher than that of the CNN-LSTM model with concatenated structure,which verified that the model proposed in this paper had the modulation recognition problem Effectiveness.