仿生复眼多级耦合光学天线优化设计及分析
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摘要
在阴影遮挡等非视距应用场景中,可见光通信系统的性能受限于严重的光功率衰减影响。基于仿生复眼的工作原理,设计了一种球面仿生复眼微透镜组和复合抛物面聚光器耦合的光学接收天线。利用Trace Pro软件分析球面仿生复眼的非成像特性,发现当探测面面积一定时,随着邻子眼光轴夹角减小,能量收集比率逐步提高,当邻子眼光轴夹角小于局部最优值时,能量收集比率达90%以上,接近最优。光轴夹角的局部最优值与探测器面积呈正相关。复眼的大视场特性随邻子眼光轴夹角的增大而逐步丧失,最终趋近于单透镜特性。对于可见光通信非视距链路的应用,可获得天线增益达56.45,视场角大于90°。利用MATLAB对室内信道进行数值分析,证明了仿生复眼多级耦合光学天线在阴影遮挡严重的场景下依旧能保持较高的馈入光功率,与普通的单透镜天线相比,平均功率提高了20 d Bm,表明所设计的光学天线具有大视场和高增益的特性,可有效提高室内可见光通信系统的抗阴影遮挡性能。
The performance of a visible optical communication system is limited by the effect of severe light power attenuation in application scenes of non-line-of-sight( NLOS) propagation such as shadow occlusion,etc. Thus,we propose a kind of optical receiving antenna coupled with spherical bionic compound eye micro-lens group and a compound parabolic concentrator. By using Trace Pro to analyze the non-imaging characteristics of bionic compound eye of spherical surface,we find that the ratio of energy collection increases with the decrease of angle of the neighbor's eye axis when the area of detection surface is certain. When the included angle between adjacent optical axes is less than local optimal value,the energy collection rate is more than 90%,which is close to the optimum. There is a positive correlation between the local optimal value of the angle of the optical axis and the area of the detector. With the increase of angle of the neighbor's eye axis,the character of large field of vision( FOV) of bionic compound eye is gone. For the application of NLOS linkof indoor visible light communication,the antenna gain can reach 56. 45 and the angle of FOV is larger than 90°.Compared with the ordinary single-lens antenna,it is clear that the bionic compound eye multilevel coupling optical antenna can maintain a high light feeding power in the case of severe shading,and the average power is increased by 20 dB m. It also shows that the design of the optical antenna with large FOV and high gain characteristics can effectively improve the anti-shadowing performance of indoor visible light communication system.
The performance of a visible optical communication system is limited by the effect of severe light power attenuation in application scenes of non-line-of-sight( NLOS) propagation such as shadow occlusion,etc. Thus,we propose a kind of optical receiving antenna coupled with spherical bionic compound eye micro-lens group and a compound parabolic concentrator. By using Trace Pro to analyze the non-imaging characteristics of bionic compound eye of spherical surface,we find that the ratio of energy collection increases with the decrease of angle of the neighbor's eye axis when the area of detection surface is certain. When the included angle between adjacent optical axes is less than local optimal value,the energy collection rate is more than 90%,which is close to the optimum. There is a positive correlation between the local optimal value of the angle of the optical axis and the area of the detector. With the increase of angle of the neighbor's eye axis,the character of large field of vision( FOV) of bionic compound eye is gone. For the application of NLOS linkof indoor visible light communication,the antenna gain can reach 56. 45 and the angle of FOV is larger than 90°.Compared with the ordinary single-lens antenna,it is clear that the bionic compound eye multilevel coupling optical antenna can maintain a high light feeding power in the case of severe shading,and the average power is increased by 20 dB m. It also shows that the design of the optical antenna with large FOV and high gain characteristics can effectively improve the anti-shadowing performance of indoor visible light communication system.
引文
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[2]Huang X,Shi J,Li J,et al.A Gb/s VLC transmission using hardware preequalization circuit[J].IEEEPhotonics Technology Letters,2015,27(18):1915-1918.
[3]Lu I C,Lai C H,Yeh C H,et al.6.36 Gbit/s RGBLED-based WDM MIMO visible light communication system employing OFDM modulation[C].IEEE Optical Fiber Communications Conference and Exhibition,2017:16929996.
[4]Wang Y,Wu X,Haas H.Load balancing game with shadowing effect for indoor hybrid Li Fi/RF networks[J].IEEE Transactions on Wireless Communications,2017,16(4):2366-2378.
[5]Li L,Tian H,Fan B.A joint resources allocation approach for hybrid visible light communication and LTEsystem[C].International Conference on Wireless Communications,Networking and Mobile Computing,IET,2016:15662822.
[6]Hussein A T,Alresheedi M T,Elmirghani J M H.Fast and efficient adaptation techniques for visible light communication systems[J].IEEE/OSA Journal of Optical Communications&Networking,2016,8(6):382-397.
[7]Liu X,Liang Z,Wang X,et al.Wide FOV receiving device for indoor visible light communication systems based on the MIMO principle[C].Proceedings of SPIE,2012,8555(3):85551S.
[8]Chen T,Liu L,Tu B,et al.High-spatial-diversity imaging receiver using fisheye lens for indoor MIMOVLCs[J].IEEE Photonics Technology Letters,2014,26(22):2260-2263.
[9]Dambul K D,O'Brien D C,Faulkner G.Indoor optical wireless MIMO system with an imaging receiver[J].IEEE Photonics Technology Letters,201,23(2):97-99.
[10]Azhar A H,Tran T,O'Brien D.A Gigabit/s indoor wireless transmission using MIMO-OFDM visible-light communications[J].IEEE Photonics Technology Letters,2013,25(2):171-174.
[11]Wei L,Zhang H,Song J.Experimental demonstration of a cubic receiver based MIMO visible light communication system[J].IEEE Photonics Journal,2017,9(1):7900107.
[12]Burton A,Minh H L,Ghassemlooy Z,et al.Performance analysis for 180°receiver in visible light communications[C].IEEE Fourth International Conference on Communications and Electronics,2012:13037209.
[13]Tang X,Pan D,Zhang X,et al.A novel receiver employing a compound-eye lens and a frequency domain synchronization algorithm for multiple-input single-output visible light communication system[C].IEEEInternational Conference on Optical Communications and Networks,2015:15382325.
[14]LüL J,Wu X W.Design of initial structure of fisheye lens[J].Acta Optica Sinica,2017,37(2):0208001.吕丽军,吴学伟.鱼眼镜头初始结构的设计[J].光学学报,2017,37(2):0208001.
[15]Cheng Y,Cao J,Hao Q,et al.Compound eye and retina-like combination sensor with a large field of view based on a space-variant curved micro lens array[J].Applied Optics,2017,56(12):3502-3509.
[16]Yun W,Tian L,Xiang L,et al.Design research and performance analysis of compound parabolic concentrators as optical antennas in visible light communication[J].Acta Physica Sinica,2015,64(12):124212.
[17]Miramirkhani F,Uysal M.Channel modeling and characterization for visible light communications[J].IEEE Photonics Journal,2015,7(6):7905616
[18]Languy F,Fleury K,Lenaerts C,et al.Flat Fresnel doublets made of PMMA and PC:combining low cos production and very high concentration ratio for CPV[J].Optics Express,2011,19(s3):A280-A294.
[19]Liu Y S.The model design of artificial optical compound eye and its path planning[D].Harbin:Harbin Institute of Technology,2010.刘业胜.曲面仿生光学复眼建模设计及其加工路径规划研究[D].哈尔滨:哈尔滨工业大学,2010.
[20]Komine T.Nakagawa M.Fundamental analysis for visible-light communication system using LED lights[J].IEEE Transactions on Consumer Electronics,2004,50(1):100-107.