基于室外可见光通信系统检测算法
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摘要
针对传统室外可见光通信系统中盲似然检测算法存在的问题,提出了一种改进的盲似然检测算法,即通过在发射端设置脉冲位置调制(PPM)帧头,接收端按帧检测分组和约束搜索。分析比较了实际室外环境下固定阈值检测、均值检测、传统盲似然检测和改进盲似然检测算法的系统误码性能。仿真结果表明:该算法有效地解决了平板问题,降低了复杂度。当湍流强度、背景光强度、传输距离和发光强度改变时,与其它检测算法相比,改进的盲似然算法的准确度更高,更适合应用于室外可见光通信。
Aiming at the problems of blind likelihood detection algorithm in traditional outdoor visible light communication system, this paper proposes an improved blind likelihood detection algorithm. By setting the pulse position modulation(PPM) header at the transmitting end, the receiving end detects the packet and constrains the search by frame. The system error performance of fixed threshold detection, mean detection, traditional blind likelihood detection and improved blind likelihood detection algorithm in real outdoor environment is analyzed and compared. The simulation results show that the algorithm effectively solves the plate problem and reduces the complexity. When the turbulence intensity, background light intensity, transmission distance and luminous intensity change, the improved blind likelihood algorithm is more accurate than other detection algorithms, and is more suitable for outdoor visible light communication.
Aiming at the problems of blind likelihood detection algorithm in traditional outdoor visible light communication system, this paper proposes an improved blind likelihood detection algorithm. By setting the pulse position modulation(PPM) header at the transmitting end, the receiving end detects the packet and constrains the search by frame. The system error performance of fixed threshold detection, mean detection, traditional blind likelihood detection and improved blind likelihood detection algorithm in real outdoor environment is analyzed and compared. The simulation results show that the algorithm effectively solves the plate problem and reduces the complexity. When the turbulence intensity, background light intensity, transmission distance and luminous intensity change, the improved blind likelihood algorithm is more accurate than other detection algorithms, and is more suitable for outdoor visible light communication.
引文
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[14]赵嘉琦,许银帆,李洁慧,等.强背景光下可见光大气湍流信道建模及分集接收技术[J].光学学报,2016,36(3):9-15.
[15]CHI N,ZHANG M J,ZHOU Y J,et al.3.375Gb/s RGB-LED based WDM visible light communication system employing PAM-8 modulation with phase shifted Manchester coding[J].Optics Express,2016,24(19):21663-21673.
[2]WANG Y,HUANG X,SHI J,et al.Long-range high-speed visible light communication system over 100-m outdoor transmission utilizing receiver diversity technology[J].Optical Engineering,2016,55(5):1-7.
[3]GOTO Y,TAKAI I,YAMAZATO T,et al.A new automotive VLCsystem using optical communication image sensor[J].IEEE Photonics journal,2016,8(3):1-17.
[4]李芬红,马朝华,朱剑涛.自由空间光通信的闭式次最优最大似然序列检测方法[J].激光杂志,2015(11):126-130.
[5]齐豫,刘智,倪小龙.基于期望最大化的随机光信号最大似然检测算法研究[J].长春理工大学学报(自然科学版),2017(2):90-93.
[6]ZHU Y J,SUN Z G,ZHANG J K,et al.Training Receivers for Repetition-Coded MISO Outdoor Visible Light Communications[J].IEEETransactions on Vehicular Technology,2017,66(1):529-540.
[7]ZHU Y,SUN Z,ZHANG J,et al.A Fast Blind Detection Algorithm for Outdoor Visible Light Communications[J].IEEE Photonics Journal,2015,7(6):1-8.
[8]DABIRI M T,SADOUGH S,SAFI H.GLRT-Based Sequence Detection of OOK Modulation Over FSO Turbulence Channels[J].IEEE Photonics Technology Letters,2017,29(17):1494-1497.
[9]DABIRI M T,SADOUGH S.Generalized Blind Detection of OOKModulation for Free-Space Optical Communication[J].IEEE Communications Letters,2017,21(10):2170-2173.
[10]TAN Z W,LIU H L.Adaptive decision directed impulse noise mitigate in power line communication[J].IET Signal Processing,2018,12(3):368-374.
[11]KIM Y H,CHUNG Y H.Experimental outdoor visible light data communication system using differential decision threshold with optical and color filters[J].Optical Engineering,2015,54(4):1-3.
[12]SONG T Y,KAM P Y.A Robust GLRT Receiver With Implicit Channel Estimation and Automatic Threshold Adjustment for the Free Space Optical Channel with IM/DD[J].Journal of Lightwave Technology,2014,32(3):369-383.
[13]ZHU Y J,SUN Z G,ZHANG J K,et al.A Fast Blind Detection Algorithm for Outdoor Visible Light Communications[J].IEEE Photonics Journal,2015,7(6):1-8.
[14]赵嘉琦,许银帆,李洁慧,等.强背景光下可见光大气湍流信道建模及分集接收技术[J].光学学报,2016,36(3):9-15.
[15]CHI N,ZHANG M J,ZHOU Y J,et al.3.375Gb/s RGB-LED based WDM visible light communication system employing PAM-8 modulation with phase shifted Manchester coding[J].Optics Express,2016,24(19):21663-21673.