Joint Coding-Modulation for Digital Semantic Communications via Variational Autoencoder

Semantic communications have emerged as a new paradigm for improving communication efficiency by transmitting the semantic information of a source message that is most relevant to a desired task at the receiver. Most existing approaches typically utilize neural networks (NNs) to design end-to-end se...

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Vydané v:IEEE transactions on communications Ročník 72; číslo 9; s. 5626 - 5640
Hlavní autori: Bo, Yufei, Duan, Yiheng, Shao, Shuo, Tao, Meixia
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: New York IEEE 01.09.2024
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Predmet:
Artificial neural networks
Coding
Communication
Communications systems
Decoding
Digital imaging
Digital modulation
Information theory
Modulation
mutual information
Neural networks
Probabilistic logic
Receivers
Semantic communications
Semantics
Symbols
Transition probabilities
variational autoencoder
ISSN:0090-6778, 1558-0857
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Shrnutí:Semantic communications have emerged as a new paradigm for improving communication efficiency by transmitting the semantic information of a source message that is most relevant to a desired task at the receiver. Most existing approaches typically utilize neural networks (NNs) to design end-to-end semantic communication systems, where NN-based semantic encoders output continuously distributed signals to be sent directly to the channel in an analog fashion. In this work, we propose a joint coding-modulation (JCM) framework for digital semantic communications by using variational autoencoder (VAE). Our approach learns the transition probability from source data to discrete constellation symbols, thereby avoiding the non-differentiability problem of digital modulation. Meanwhile, by jointly designing the coding and modulation process together, we can match the obtained modulation strategy with the operating channel condition. We also derive a matching loss function with information-theoretic meaning for end-to-end training. Experiments on image semantic communication validate the superiority of our proposed JCM framework over the state-of-the-art quantization-based digital semantic coding-modulation methods across a wide range of channel conditions, transmission rates, and modulation orders. Furthermore, its performance gap to analog semantic communication reduces as the modulation order increases while enjoying the hardware implementation convenience.
Bibliografia:ObjectType-Article-1
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content type line 14
ISSN:0090-6778
1558-0857
DOI:10.1109/TCOMM.2024.3386577