基于GMD-BD预编码的多用户MIMO可见光通信系统  

Multi-user MIMO visible light communication system based on GMD-BD precoding

作　　者：关少义 李正权 GUAN Shaoyi;LI Zhengquan(School of Internet of Things Engineering,Jiangnan University,Jiangsu 214122,China;Jiangsu Future Networks Innovation Institute,Nanjing,Jiangsu 211111,China)

机构地区：[1]江南大学物联网工程学院,江苏无锡214122 [2]江苏省未来网络创新研究院,江苏南京211111

出　　处：《光电子．激光》2022年第5期529-535,共7页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金(61571108);无锡市科技发展资金(H20191001,G20192010);未来网络科研基金(FNSRFP-2021-YB-11)资助项目。

摘　　要：在基于奇异值分解(singular value decomposition,SVD)的块对角(block diagonal,BD)预编码多用户多输入多输出(multiple input multiple output,MIMO)室内可见光通信(visible light communication,VLC)系统中,同一用户终端的不同光接收机误码率性能有较大差别,而用户终端误码率性能受限于最差性能的接收机。针对此问题,本文利用决策反馈均衡(decision feedback equalization,DFE)非线性接收机,提出了基于几何均值分解(geometric mean decomposition,GMD)的BD预编码多用户MIMO室内VLC系统,并利用同一用户终端采用不同视场角(field of view,FOV)的接收机进一步提高用户终端误码率性能,分析了用户终端位置对用户终端误码率性能的影响。最后通过仿真验证了本文提出的系统使同一用户终端的不同接收机获得相近的误码率性能,提高了最差接收机的性能,降低了用户终端误码率。当单个发光二极管(light emitting diode,LED)的发射功率为10 mW和系统传输速率为100 Mbit/s时,在室内95%的区域内用户终端能够达到10^(-6)左右的误码率性能。In the block diagonal(BD) precoding multi-user multiple input multiple output(MIMO) indoor visible light communication(VLC) system based on singular value decomposition(SVD),the bit error rate performance of different receivers of the same user terminal is quite different,and the performance of the user terminal is limited to the worst-performing receiver.To solve above problem,this paper uses nonlinear receivers of decision feedback equalization(DFE),and proposes a BD precoding multi-user MIMO indoor VLC system based on geometric mean decomposition(GMD).For the same user terminal,different field of view(FOV) receivers to improve the bit error rate performance of user terminal,and analyze the impact of user terminal location on the bit error rate performance of user terminals.Finally,the simulation results show that the proposed system in this paper enables different receivers of the same user terminal to obtain similar bit error rate performance,improves the performance of the worst receiver and reduces the bit error rate of the user terminal.When the emission power of a single light emitting diode(LED) is 10 mW and the system transmission rate is 100 Mbit/s,user terminals can achieve the bit error rate performance of about 10^(-6) in 95% of the indoor area.

关 键 词：可见光通信 决策反馈均衡 块对角化预编码 几何均值分解 

分 类 号：TN929.1[电子电信—通信与信息系统]