Signa1 modulation recognition (SMR) is an essential and challenging topic in orthogonal frequency-division multiplexing (OFDM) systems, and also it is the fundamental technique for signal detection and recovery. However, traditional feature extraction based SMR methods cannot effectively acquire the characteristics of the OFDM signals. Hence, the modulated OFD-M signal cannot be reliably identified. In this paper, we propose a deep learning (DL) based SMR method for recognizing OFDM signals, which is combined with a convolutional neural network (CNN) trained on in-phase and quadrature (IQ) samples. In the network model, the batch normalization (BN) layer and dropout layer are used to speed up model training and prevent overfitting, respectively. Three convolution layers with different convolution kernels perform well than traditional feature extraction methods in obtaining intrinsic properties of OFDM signals. The same number of multiple modulated signals are mixed and sent to the trained model for identification. Experiments are conducted to show that the method we proposed performs better than the traditional methods, mainly reflected in a higher probability of correct classification (PCC) and better consistency.


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    Title :

    Convolutional Neural Network Aided Signal Modulation Recognition in OFDM Systems


    Contributors:
    Hong, Sheng (author) / Wang, Yu (author) / Pan, Yuwen (author) / Gu, Hao (author) / Liu, Miao (author) / Yang, Jie (author) / Gui, Guan (author)


    Publication date :

    2020-05-01


    Size :

    209636 byte





    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English