Multi-User Semantic Fusion for Semantic Communications over Degraded Broadcast Channels  

作　　者：Wu Tong Chen Zhiyong Tao Meixia Xia Bin Zhang Wenjun 

机构地区：[1]Cooperative Medianet Innovation Center,Shanghai Jiao Tong University,Shanghai 200240,China

出　　处：《China Communications》2024年第10期86-100,共15页中国通信（英文版）

基　　金：supported in part by National Key R&D Project of China (2023YFB2906201);the National Natural Science Foundation of China (62222111, 62125108 and 62431015);the Fundamental Research Funds for the Central Universities。

摘　　要：Degraded broadcast channels(DBC) are a typical multiuser communication scenario, Semantic communications over DBC still lack in-depth research. In this paper, we design a semantic communications approach based on multi-user semantic fusion for wireless image transmission over DBC. The transmitter extracts semantic features for two users separately and then effectively fuses them for broadcasting by leveraging semantic similarity. Unlike traditional allocation of time, power, or bandwidth, the semantic fusion scheme can dynamically control the weight of the semantic features of the two users to balance their performance. Considering the different channel state information(CSI) of both users over DBC,a DBC-Aware method is developed that embeds the CSI of both users into the joint source-channel coding encoder and fusion module to adapt to the channel.Experimental results show that the proposed system outperforms the traditional broadcasting schemes.

关 键 词：channel adaptability degraded broadcasting channels semantic communications semantic fusion 

分 类 号：TN929.5[电子电信—通信与信息系统]