信号处理2025，Vol.41Issue(10)：1647-1656,10.DOI:10.12466/xhcl.2025.10.005
面向任务的语义通信率失真理论
Task-specific Rate-distortion Theory for Semantic Communication
摘要
Abstract
Semantic communication has attracted considerable interest because of its potential to support emerging human-centric services such as holographic communications,extended reality(XR),and human-machine interactions.Contrary to traditional communication systems that focus on minimizing symbol-level distortion(e.g.,bit error rate and signal-to-noise ratio),semantic communication targets delivering the intended meaning to the destination user,which is often quantified by various statistical divergences referred to as semantic distances.However,there remains a lack of a unified theoretical framework for semantic communication that can quantify the rate-distortion tradeoff when different task-specific semantic distance metrics are employed.To address this gap,we propose a task-oriented semantic rate-distortion theory,which is compatible with multiple task-dependent divergence measures.To investigate the impact of different semantic distance metrics on achievable rates,case studies were conducted on two representative tasks,classi-fication and signal generation,and their performances were compared under various scenarios.The result analysis re-vealed the fundamental trade-offs between rate,distortion,and semantic distance in semantic communication.关键词
语义通信/率-失真理论/面向任务的通信Key words
semantic communication/rate-distortion theory/task-specific communication分类
信息技术与安全科学引用本文复制引用
柴靖轩,肖泳,石光明..面向任务的语义通信率失真理论[J].信号处理,2025,41(10):1647-1656,10.基金项目
移动信息网络国家科技重大专项(2024ZD1300700) （2024ZD1300700）
国家自然科学基金(62301516) National Science and Technology Major Project"Mobile Information Network"(2024ZD1300700) （62301516）
The National Natural Science Foundation of China(62301516) （62301516）
