PMT阵列在水下MIMO无线光通信中的应用  

MIMO scheme for underwater wireless optical communication system using PMT array

作　　者：李金佳 叶德茂 王林宁 傅康 王永进 Li Jinjia;Ye Demao;Wang Linning;Fu Kang;Wang Yongjin(College of Telecommunications&Information Engineering,Nanjing University of Posts and Telecommunications,Nanjing 210003,China;Harbin University of Science and Technology(Weihai),Weihai 264300,China;The 713th Research Institute of China Shipbuilding Industry Corporation,Zhengzhou 450015,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 [2]哈尔滨理工大学(威海),山东威海264300 [3]中国船舶集团有限公司第七一三研究所,河南郑州450015

出　　处：《红外与激光工程》2021年第8期293-301,共9页Infrared and Laser Engineering

基　　金：江苏省研究生科研与实践创新计划项目(KYCX20_0712)。

摘　　要：水下无线光通信具有的高带宽、低时延等特点,已成为水下通信的可行选择。系统发送端光源由6只绿光发光二极管(LED)构成阵列,接收端由3只光电倍增管(PMT)构成阵列,形成了6×3的多输入多输出(MIMO)传输方式。在室内10 m水槽水下信道下,实现了1 Mbps的信息传输速率。通过MATLAB软件对接收平面光功率分布仿真,最大值为-35.8 dBm。此外,测试了PMT阳极输出电压波形,并推导出阴极电流波形。理论计算得出信噪比为19.4 dB,理论误码率约为1.1×10-5。所选PMT模块理论上最小接收功率可低至1.5×10-9 W,体现出极高的探测灵敏度。最后,通过蒙特卡洛(Monte Carlo)数字仿真说明,在信噪比25 dB可达到约35 bit·s-1·Hz-1的信道容量。Underwater wireless optical communication(UWOC) has the characteristics of high bandwidth and low latency, and have become a viable alternative for underwater communication. The transmitter and receiver arrays of this system are composed of six green light emitting diode(LED) and three photomultiplier tube(PMT),respectively, and forming a 6×3 multiple input multiple output(MIMO) transmission mode. This system achieved a 1 Mbps data transmission rate over a distance of 10 m water tank underwater channel. MATLAB was adopted to simulate this underwater channel model and predict the received optical power distribution on the receiving plane and the maximum value is-35.8 dBm. Moreover, the PMT anode output voltage and the cathode current waveform were tested. Derivation and calculation show that the signal-to-noise ratio(SNR) is 19.4 dB, and the bit error rate(BER) is approximately 1.1×10-5. The theoretical minimum received power of the this PMT module can be as low as 1.5×10-9 W, which reflects its extremely high sensitivity. Finally, through Monte Carlo channel simulation, the performance of MIMO is further verified, and the channel capacity of 35 bit·s-1·Hz-1 can be reached at a SNR of 25 dB.

关 键 词：水下无线光通信 MIMO 绿光LED PMT阵列 

分 类 号：TN929.1[电子电信—通信与信息系统]