基于SWIPT的无小区大规模MIMO-NOMA系统能量效率研究  

Energy efficiency research for SWIPT-based cell-free massive MIMO-NOMA systems

作　　者：董恒[1] 徐凯 宋荣方[1] DONG Heng;XU Kai;SONG Rongfang(School of Communications and Information Engineering,Nanjing University of Posts and Telecommunications,Nanjing 210003,China)

机构地区：[1]南京邮电大学通信与信息工程学院,江苏南京210003

出　　处：《南京邮电大学学报（自然科学版）》2024年第2期11-18,共8页Journal of Nanjing University of Posts and Telecommunications：Natural Science Edition

基　　金：国家自然科学基金(62171235)资助项目。

摘　　要：无小区大规模多输入多输出(Multiple-Input Multiple-Output,MIMO)与非正交多址接入(Non-Orthogonal Multiple Access,NOMA)都是未来6G的使能技术。无线携能通信(Simultaneous Wireless Information and Power Transfer,SWIPT)技术在进行信息解码的同时收集能量,与无小区大规模MIMO-NOMA优势互补。文中基于SWIPT研究无小区大规模MIMO-NOMA系统中的能量效率问题,通过联合优化功率分配系数和SWIPT的时隙切换(Time Switching,TS)系数,提高系统的能量效率。为了最大化能量效率,采用布谷鸟算法设计功率分配系数。考虑一种特殊情况,将所有终端的TS系数设置相同,进而推导了最佳TS系数的封闭表达式。仿真结果表明,相较于几种已有方案,文中提出的优化方案可以显著提升系统的能量效率。Both non-orthogonal multiple access(NOMA)and cell-free massive multiple-input multiple-output(MIMO)are regarded as 6G enabling techniques.The simultaneous wireless information and power transfer(SWIPT)technology harvestes energy while decodes information,which complements the advantages of cell-free massive MIMO-NOMA.In this paper,based on the SWIPT technology,we study the energy efficiency of cell-free massive MIMO systems,and then improve it by jointly optimizing the power allocation coefficient and the time switching(TS)control coefficient of SWIPT.To further maximize the energy efficiency,we also develop the Cuckoo search algorithm to optimize the power allocation.In regard of the special case where all terminals have the same TS control coefficient and the expression of optimal time switching control coefficient is derived.Simulation results show that the proposed optimization algorithm can significantly improve the system energy efficiency,compared with current popular methods.

关 键 词：非正交多址 无线携能通信 无小区大规模MIMO 能量效率 时隙切换 

分 类 号：TN929.5[电子电信—通信与信息系统]