Model division multiple access for semantic communications  

作　　者：Ping ZHANG Xiaodong XU Chen DONG Kai NIU Haotai LIANG Zijian LIANG Xiaoqi QIN Mengying SUN Hao CHEN Nan MA Wenjun XU Guangyu WANG Xiaofeng TAO 

机构地区：[1]State Key Laboratory of Networking and Switching Technology,Beijing University of Posts and Telecommunications,Beijing 100876,China [2]Department of Broadband Communication,Peng Cheng Laboratory,Shenzhen 518066,China [3]ZGC Institute of Ubiquitous-X Innovation and Applications,Beijing 100876,China [4]School of Information and Communication Engineering,Beijing University of Posts and Telecommunications,Beijing 100876,China

出　　处：《Frontiers of Information Technology & Electronic Engineering》2023年第6期801-812,共12页信息与电子工程前沿（英文版）

基　　金：supported by the National Key R&D Program of China(No.2022YFB2902102)。

摘　　要：In a multi-user system,system resources should be allocated to different users.In traditional communication systems,system resources generally include time,frequency,space,and power,so multiple access technologies such as time division multiple access(TDMA),frequency division multiple access(FDMA),space division multiple access(SDMA),code division multiple access(CDMA),and non-orthogonal multiple access(NOMA)are widely used.In semantic communication,which is considered a new paradigm of the next-generation communication system,we extract high-dimensional features from signal sources in a model-based artificial intelligence approach from a semantic perspective and construct a model information space for signal sources and channel features.From the high-dimensional semantic space,we excavate the shared and personalized information of semantic information and propose a novel multiple access technology,named model division multiple access(MDMA),which is based on the resource of the semantic domain.From the perspective of information theory,we prove that MDMA can attain more performance gains than traditional multiple access technologies.Simulation results show that MDMA saves more bandwidth resources than traditional multiple access technologies,and that MDMA has at least a 5-dB advantage over NOMA in the additive white Gaussian noise(AWGN)channel under the low signal-to-noise(SNR)condition.

关 键 词：Model division multiple access(MDMA) Semantic communication Multiple access 

分 类 号：TN92[电子电信—通信与信息系统]