无线光通信中基于光子计数的接收误码性能分析  

Error Performance Analysis of Photon-Counting Based Receiving for Optical Wireless Communication

作　　者：汪琛[1] 徐智勇[1] 汪井源[1] 赵继勇[1] 韦毅梅[1] 

机构地区：[1]中国人民解放军理工大学通信工程学院,江苏南京210007

出　　处：《中国激光》2016年第3期110-117,共8页Chinese Journal of Lasers

基　　金：区域光纤通信网与新型光通信系统国家重点实验室开放基金(2013GZKF031304)

摘　　要：为了实现强衰减条件下的无线光通信,研究利用单光子探测器检测接收端光信号。在分析门控模式盖革雪崩光电二极管(Gm-APD)工作原理的基础上,基于泊松分布,对单个门内Gm-APD的触发概率进行研究。根据二项分布,建立了基于单个Gm-APD的误码率模型,研究了单个门内的信号光子数、背景光子数与信号周期内开门次数对误码率的影响。理论分析与数值仿真结果表明,信号周期内开门次数决定了系统可能达到的最低误码率;误码率随信号周期内开门次数增加呈指数下降;将误码率控制在10-3相比于10-9,接收灵敏度将至少提高3 d B。最后通过实验测量了给定条件下的误码率,并与模型仿真结果进行对比,验证了模型的正确性。In order to achieve optical wireless communication in condition of strong attenuation, the signal photons which arrive at receiver are detected by single photon avalanche detector. The principle of Geiger-mode avalanche photodiode detector （Gm-APD） operating in gated mode is analyzed. Based on the Poisson distribution, the trigger probability of Gm-APD in a gate is researched. According to the binomial distribution, the bit error rate （BER） model of single Gm-APD is built. It is researched that how BER varies with signal photons per gate, background photons per gate and the number of gates per bit. Theory and simulation results show that the best BER performance is determined by the number of gates per bit; the BER decreases exponentially with the increase of gates per bit, and the receiving sensitivity can be improved at least 3 dB under BER of 10-3 compared to BER of 10-9. Finally, the BER obtained by experiment under the given conditions is compared with simulation results, which shows the validity of the BER model.

关 键 词：光通信 光子计数 盖革雪崩光电二极管 二项分布 误码率 

分 类 号：TN929.12[电子电信—通信与信息系统]