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arXiv 2408.05596eess.SP
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面向6G移动网络的显式语义基赋能通信

Explicit Semantic-Base-Empowered Communications for 6G Mobile Networks

Fengyu Wang, Yuan Zheng, Wenjun Xu, Junxiao Liang, Ping Zhang, Zhu Han

AI总结:

本文提出一种基于显式语义基的6G语义通信系统,通过构建显式知识库并设计兼容5G的协议栈与不等错误保护机制,解决了传统神经网络语义通信缺乏可解释性和兼容性的问题,在图像传输中显著提升了性能与鲁棒性。

摘要:

海量数据传输需求的不断增长给通信系统带来了重大挑战。传统通信系统侧重于准确重建比特序列,而旨在传递信息内涵的语义通信被视为6G移动网络的一项关键技术。当前大多数SemCom利用端到端训练的神经网络(NN)进行语义提取和解释,缺乏可解释性以供进一步优化。此外,基于NN的SemCom假设协议栈的应用层和物理层可以联合训练,这与当前的数字通信系统不兼容。为了克服这些缺陷,我们提出了一种SemCom系统,采用显式语义基作为基本单元来表示语义内涵。首先,提出了Sebs的数学模型以构建显式知识库(KB)。然后,提出了基于Sebs的SemCom架构,包括通信模式和KB更新模式,以实现通信系统的演进。专门设计了Sem编解码器和信道编解码器模块,在显式KB的辅助下实现高效且鲁棒的语义传输。此外,考虑通信意图和Sebs的重要性,策略性地实施了不等错误保护(UEP),从而确保关键语义的可靠性。另外,提出了一种与5G协议栈兼容的基于Sebs的SemCom协议栈。为了评估所提出的基于Sebs的SemCom的有效性和兼容性,进行了一项以图像传输任务为重点的案例研究。仿真表明,我们的基于Sebs的SemCom在不同通信意图下的LPIPS指标上比最先进的工作高出20%以上,并在波动的信道条件下表现出鲁棒性,凸显了显式Sebs提供的可解释性和灵活性优势。

英文摘要:

Increasing demands for massive data transmission pose significant challenges to communication systems. Compared with traditional communication systems that focus on the accurate reconstruction of bit sequences, SemComs, which aim to deliver information connotation, are regarded as a key technology for 6G mobile networks. Most current SemComs utilize an end-to-end trained NN for semantic extraction and interpretation, which lacks interpretability for further optimization. Moreover, NN-based SemComs assume that the application and physical layers of the protocol stack can be jointly trained, which is incompatible with current digital communication systems. To overcome those drawbacks, we propose a SemCom system that employs explicit semantic bases (Sebs) as the basic units to represent semantic connotations. First, a mathematical model of Sebs is proposed to build an explicit KB. Then, the Seb-based SemCom architecture is proposed, including both a communication mode and a KB update mode to enable the evolution of communication systems. Sem-codec and channel codec modules are designed specifically, with the assistance of an explicit KB for the efficient and robust transmission of semantics. Moreover, UEP is strategically implemented, considering communication intent and the importance of Sebs, thereby ensuring the reliability of critical semantics. In addition, a Seb-based SemCom protocol stack that is compatible with the 5G protocol stack is proposed. To assess the effectiveness and compatibility of the proposed Seb-based SemComs, a case study focusing on an image-transmission task is conducted. The simulations show that our Seb-based SemComs outperform state-of-the-art works in LPIPS by over 20% under varying communication intents and exhibit robustness under fluctuating channel conditions, highlighting the advantages of the interpretability and flexibility afforded by explicit Sebs.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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