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Model division multiple access for semantic communications

查看全文 作　　者：Ping [1,2,3]ZHANG;Xiaodong [1,2,3]XU;Chen [1]DONG;Kai [1,2]NIU;Haotai [1]LIANG;Zijian [1]LIANG;Xiaoqi [1]QIN;Mengying [1]SUN;Hao [1]CHEN;Nan [1,2]MA;Wenjun [1]XU;Guangyu [1]WANG;Xiaofeng [2,4]TAO 高影响力作者 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高影响力机构 出　　处：《Frontiers of Information Technology & Electronic Engineering》索引2023年第24卷第6期,共12页高影响力期刊 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
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