Achieving full mutualism with massive passive devices for multiuser MIMO symbiotic radio  

作　　者：Jingran XU Zhuoyin DAI Yong ZENG Shi JIN Tao JIANG 

机构地区：[1]National Mobile Communications Research Laboratory,Southeast University,Nanjing 210096,China [2]Purple Mountain Laboratories,Nanjing 211111,China [3]Research Center of 6G Mobile Communications,School of Cyber Science and Engineering,and Wuhan National Laboratory for Optoelectronics,Huazhong University of Science and Technology,Wuhan 430074,China

出　　处：《Science China(Information Sciences)》2024年第9期192-208,共17页中国科学（信息科学）（英文版）

基　　金：supported by National Key R&D Program of China(Grant No.2019YFB1803400)。

摘　　要：Symbiotic radio(SR)is one of the attractive communication technologies to facilitate largescale Internet of Things(IoT)connections with enhanced energy and spectrum efficiency,where passive backscatter devices(BDs)modulate their information over the radio frequency(RF)signals emitted by the active primary transmitters(PTs).Meanwhile,the primary transmission can be strengthened with the additional multipaths created by BDs.To capitalize to a greater extent on the mutualism relationship between the two types of communication,this paper studies multiple-input multiple-output(MIMO)SR communication systems including multiple PTs and massive BDs.We derive the achievable rate expressions of each PT and BD,as well as the sum rate expressions of primary and secondary communication,respectively.Then asymptotic analysis is given to derive the active and passive communication rates with a large number of BDs.Furthermore,for the general case with a finite number of BDs,we study the precoding optimization problem to maximize the sum rate of primary communication,while ensuring that the sum rate of secondary communication and the individual rate for each PT and BD in the prescribed active and passive user sets satisfy the specified thresholds.Simulation results are presented to verify the analytical studies.

关 键 词：multiuser MIMO SR BACKSCATTERING massive backscatter devices asymptotic analysis active and passive communication 

分 类 号：TN929.5[电子电信—通信与信息系统]