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arXiv 2602.08260eess.SP
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迈向最优语义通信:重新审视语义特征通道的作用

Semantic Feature Channel Optimization: A Unified Framework for Analog and Digital Semantic Communications

Singapore University of Technology and Design(新加坡科技设计大学);Adelaide University(阿德莱德大学);POSTECH(浦项工科大学)

Yongjeong Oh, Jihong Park, Jinho Choi, Yo-Seb Jeon

AI总结:

本文提出了一种基于语义特征通道优化的联合优化框架,通过线性编码器-解码器结构和高斯源假设,实现了在不同通信环境下更优的任务性能。

摘要:

本文研究了在语义通信(SC)中传输编码器输出(称为语义特征,SFs)的优化问题。我们从编码器输出到解码器输入的整个通信过程建模为SF通道,从而建立编码器-SF通道-解码器流水线。与以往假设SF通道固定的研究所不同,我们注意到SF通道是可配置的,因为其特性由各种传输和接收策略(如功率分配)所塑造。基于这一观察,我们提出了在语义特征与其重建之间存在互信息约束下的SF通道优化问题,并在线性编码器-解码器结构和高斯源假设下进行了解析推导。在此理论基础上,我们提出了一种适用于模拟和数字SC的编码器-解码器与SF通道的联合优化框架。为了实现优化的SF通道,我们还提出了一种物理层校准策略,使能够实现实时功率控制和适应变化的信道条件。仿真结果表明,所提出的SF通道优化在各种通信环境中均能实现更优的任务性能。

英文摘要:

Semantic communication (SC) aims to improve communication efficiency by transmitting only task-relevant information, termed semantic features (SFs). Most existing SC frameworks achieve this by optimizing the encoder and decoder while treating the channel between them as fixed. In this paper, we introduce a new perspective by explicitly modeling the entire process from the encoder output to the decoder input as an SF channel, resulting in an encoder-SF channel-decoder pipeline. We observe that the SF channel is configurable through transceiver operations, such as power allocation, thereby providing an additional degree of freedom for improving task performance. Inspired by this, we formulate a joint optimization problem for the encoder, SF channel, and decoder under a mutual information constraint between the transmitted and reconstructed SFs. To provide analytical insight, we derive the optimal SF channel in closed form for an analytically tractable setting. Based on this formulation, we develop a unified semantic feature channel optimization framework applicable to both analog and digital SC systems. To realize the SF channel in general communication systems, we further propose a physical-layer calibration strategy that aligns the actual SF channel with the trained one. Simulation results demonstrate that the proposed framework consistently improves task performance across various communication environments.

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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