Wireless Semantic Communications

List of Contributions xiii

Preface xvii

1 Intelligent Transceiver Design for Semantic Communication 1
Yiwen Wang, Yijie Mao, and Zhaohui Yang

1.1 Knowledge Base 1

1.2 Source and Channel Coding 4

1.3 Multiuser SC 7

1.4 Transceiver Design for Single-Modal and Multimodal Data 13

1.5 Challenges and Future Directions 16

2 Joint Cell Association and Spectrum Allocation in Semantic Communication Networks 23
Le Xia, Yao Sun, and Muhammad Ali Imran

2.1 Introduction 23

2.2 Semantic Communication Model 26

2.3 Optimal CA and SA Solution in the PKM-Based SC-Net 32

2.4 Optimal CA and SA Solution in the IKM-Based SC-Net 35

2.5 Numerical Results and Discussions 38

2.6 Conclusions 44

3 An End-to-End Semantic Communication Framework for Image Transmission 47
Lei Feng, Yu Zhou, and Wenjing Li

3.1 Introduction 47

3.2 The End-to-End Image Semantic Communication Framework Driven by Knowledge Graph 50

3.3 Semantic Similarity Measurement 59

3.4 Simulation 62

3.5 Conclusion 63

4 Robust Semantic Communications and Privacy Protection 67
Xuefei Zhang

4.1 Motivation and Introduction 67

4.2 Robust Semantic Communication 68

4.3 Knowledge Discrepancy-Oriented Privacy Protection for Semantic Communication 75

4.4 Conclusion 84

5 Interplay of Semantic Communication and Knowledge Learning 87
Fei Ni, Bingyan Wang, Rongpeng Li, Zhifeng Zhao, and Honggang Zhang

5.1 Introduction 87

5.2 Basic Concepts and RelatedWorks 88

5.3 A KG-enhanced SemCom System 91

5.4 A KG Evolving-based SemCom System 99

5.5 LLM-assisted Data Augmentation for the KG Evolving-Based SemCom System 104

5.6 Conclusion 105

6 VISTA: A Semantic Communication Approach for Video Transmission 109
Chengsi Liang, Xiangyi Deng, Yao Sun, Runze Cheng, Le Xia, Dusit Niyato, and Muhammad Ali Imran

6.1 Introduction 109

6.2 Video Transmission Framework in VISTA 110

6.3 SLG-Based Transceiver Design in VISTA 111

6.4 Simulation Results and Discussions 116

6.5 Conclusions 120

7 Content-Aware Robust Semantic Transmission of Images over Wireless Channels with GANs 123
Xuyang Chen, Daquan Feng, Qi He, Yao Sun, and Xiang-Gen Xia

7.1 Introduction 123

7.2 System Model 124

7.3 System Architecture 127

7.4 Experimental Results 127

7.5 Conclusion 130

8 Semantic Communication in the Metaverse 133
Yijing Lin, Zhipeng Gao, Hongyang Du, Jiacheng Wang, and Jiakang Zheng

8.1 Introduction 133

8.2 RelatedWork 134

8.3 Unified Framework for SemCom in the Metaverse 137

8.4 Zero-Knowledge Proof-Based Semantic Verification 142

8.5 Diffusion Model-Based Resource Allocation 147

8.6 Simulation Results 152

8.7 Future Directions 155

8.8 Conclusion 157

9 Large Language Model-Assisted Semantic Communication Systems 163
Shuaishuai Guo, Yanhu Wang, Biqian Feng, and Chenyuan Feng

9.1 Introduction 163

9.2 SSSC Using Pretrained LLMs 165

9.3 SIAC Using Pretrained LLMs 171

9.4 Future Direction of Using LLMs: Semantic Correction 178

9.5 Conclusion 180

10 RIS-Enhanced Semantic Communication 183
Bohao Wang, Ruopeng Xu, Zhaohui Yang, and Chongwen Huang

10.1 RIS-Empowered Communications 183

10.2 Beamforming Design for RISs Enhanced Semantic Communications 184

10.3 Privacy Protection in RIS-Assisted Semantic Communication System 189

10.4 AI for RIS-Assisted Semantic Communications 191

10.5 Conclusion 195

Acronyms 195

References 196

Index 199