Journal of Xidian University ›› 2022, Vol. 49 ›› Issue (3): 74-82.doi: 10.19665/j.issn1001-2400.2022.03.009

• Information and Communications Engineering • Previous Articles     Next Articles

Denoising autoencoder-aided downlink MIMO-SCMA codec method

JIANG Fang1,2(),HUANG Xing1(),HU Mengyu1(),WANG Yi1,2(),XU Yaohua1,2(),HU Yanjun1,2()   

  1. 1. Key Laboratory of Intelligent Computing & Signal Processing,Ministry of Education,Anhui University,Hefei 230601,China
    2. Anhui Internet of Things Spectrum Sensing and Testing Engineering Technology Research Center,Hefei 230601,China
  • Received:2021-01-26 Revised:2021-12-08 Online:2022-06-20 Published:2022-07-04

Abstract:

Aiming to improve the bit error rate (BER) performance of sparse code multiple access (SCMA)systems in multi-antenna applications,deep learning is introduced in a MIMO-SCMA system and a denoising autoencoder-aided Codec method (DAE-MIMO-SCMA) is proposed.Multiple deep neural network (DNN) units are used by the transmitter to construct the MIMO-SCMA encoder.The codebook of each user on different transmitting antennas is obtained through neural network (NN) learning.Moreover,the noise layer is used at the transmitter so that the output of the encoder is more robust.At the receiver is designed a fully connected DNN as a decoder,which combines multi-antenna detection and multi-user detection to obtains the original data of all users at one time.An end-to-end training method is used to train the Codec,optimizing the structure and parameters of the NN,which improves the convergent rate.Experimental results show that the proposed Codec method can lower the BER of the MIMO-SCMA system and reduce the detection time at the receiver.

Key words: multiple input multiple output, sparse code multiple access, denoising autoencoder, deep neural network

CLC Number: 

  • TN914.5