基于DCO-OFDM的水下蓝绿光成像MIMO系统功率优化  

Power optimization of underwater blue and green light Imaging MIMO system based on DCO-OFDM

作　　者：赵冉 符杰林[1,2] 李燕龙[1,2,3] 林基明[1] ZHAO Ran;FU Jielin;LI Yanlong;LIN Jiming(College of Information and Communication,Guilin University of Electronic Technology,Guilin Guangxi 541004,China;Ministry of Education Key Lab of Cognitive Radio and Information Processing,Guilin University of Electronic Technology,Guilin Guangxi 541004,China;National Demonstration Center for Experimental electronic circuit Education,Guilin University ofElectronic Technology,Guilin Guangxi 541004,China)

机构地区：[1]桂林电子科技大学信道与通信学院,广西桂林541004 [2]桂林电子科技大学认知无线电与信息处理教育部重点实验室,广西桂林541004 [3]桂林电子科技大学电子电路国家级实验教学示范中心,广西桂林541004

出　　处：《光通信技术》2019年第10期41-46,共6页Optical Communication Technology

基　　金：国家自然科学基金（61761014）资助;认知无线电与信息处理教育部重点实验室2017年主任基金（CRKL170106）资助;广西高校中青年教师基础能力提升项目（2018KY0208）资助;广西研究生教育创新计划资助项目（YCBZ2017050）资助;广西自然科学基金项目（2018GXNSFBA281131）资助;广西重点研发计划项目（桂科AB18126030）资助

摘　　要：针对水下蓝绿光成像多输入多输出(MIMO)系统成像接收存在信号干扰的问题,提出一种优化各发射端直流偏置的功率分配方法。该方法以加直流偏置的光正交频分复用(DCO-OFDM)成像MIMO系统误码率最小为目标,在总功率一定的条件下,利用信道矩阵奇异值分解求得发射端最优功率分配矩阵,并在保证信号非负的基础上,根据最优功率分配矩阵求解各发射端所需添加的直流偏置量。仿真结果表明:与未进行功率优化的成像MIMO-DCO-OFDM系统相比,该方法可进一步降低水下蓝绿光成像MIMO系统的误码率。Aiming at the problem of signal interference in underwater blue and green light imaging multiple-input multiple-output(MIMO)system,a power distribution method is proposed to optimize the direct-current(DC)bias of each transmitter.This method aims at minimizing the bit error rate of DC biased optical OFDM(DCO-OFDM)imaging MIMO system.Under the condition of a certain total power,the channel matrix singular value decomposition is used to obtain the optimal power distribution matrix at the transmitter.On the basis of ensuring the non-negative signal,the DC bias required to be added at each transmitter is solved according to the optimal power distribution matrix.Simulation results show that compared with the MIMO-DCO-OFDM imaging system without power optimization,this method can further reduce the bit error rate(BER)of underwater blue and green light imaging MIMO system.

关 键 词：水下蓝绿光成像MIMO 功率优化 直流偏置 误码率 

分 类 号：TN929.1[电子电信—通信与信息系统]