室内可见光通信复合光学接收端设计与分析  

Design and analysis of composite optical receiver for indoor visible light communication

作　　者：王云[1] 蓝天[1] 倪国强[1] 

机构地区：[1]北京理工大学光电学院光电成像技术与系统教育部重点实验室,北京100081

出　　处：《物理学报》2017年第8期125-133,共9页Acta Physica Sinica

基　　金：国家重点基础研究发展计划(批准号:2013CB329202)资助的课题~~

摘　　要：本文提出了一种适用于室内可见光通信的新型光学接收端的设计.根据复合抛物面聚光器的聚光特性,将光电探测器与复合抛物面聚光器耦合作为接收子单元,并将这些接收子单元按照特定的几何关系嵌入一个半球面中,得到角度分集型的复合光学接收端,达到水平方向360°,垂直方向180°的大视场.对每个接收单元接收到的光能量,低传输数据时进行相加求和作为最终的接收功率,高数据速率时取各个子单元的最大值作为接收功率.在一个5 m×5 m×3 m的空旷房间中,通过MATLAB对室内可见光通信系统建模仿真.计算结果表明,采用这种复合型光学接收端后,两种不同处理算法下的接收功率相对于直接接收分别提高了11.85和7.47 dB,增益分别为15.31和5.98.信噪比较高,两种情况下的平均值分别为79.17和72.26 dB,且接收信噪比分布平缓,波动较小.这说明采用本文设计的光学接收端,不仅能够得到较大的接收端视场角,同时获得较高的增益和接收功率,以及稳定的接收信噪比,避免了室内可见光通信系统中通信盲区的存在,保证了室内通信性能的稳定性.A novel design of optical receiver for visible light communication system in indoor environment is proposed in this study.The compound parabolic concentrator is coupled with a photo-detector as the receiving unit due to its optical properties.The composite optical receiver is composed of seven receiving units inserted in a hyper-hemispherical lens aligned with geometry configuration based on angle diversity.The composite optical receiver has fields of view of 360°in the horizontal direction and 180° in the vertical direction respectively,while the field of view of each receiving unit is30°.Model of indoor visible light communication is built through measurement in a room of a5 m × 5m × 3m size.The received power and SNR distribution are acquired through MATLAB scripts.The received power of each receiving unit is treated by different algorithms.At a lower data rate,the sum of the received power from all receiving units is the final received power,while at a higher data rate,the final received power is the highest value of power collected by the each unit.The results show that the received powers of the composite receiver by using two different algorithms increase 11.58 and 7.47 dB,respectively,while the gains of the receiver are 15.31 and 5.98,respectively.The mean values of the signaltonoise ratio are 79.17 dB from the sum algorithm and 72.26 dB from maximum algorithm,respectively.It is concluded that signaltonoise ratio is high and the distribution fluctuation is weak.This usually means a good and stable communication performance.It is proved that the composite receiver designed in this study gives high quality communication performance and presents a wide field of view,thereby avoiding the blind area in communication.

关 键 词：室内可见光通信 接收端 接收功率 

分 类 号：TN929.1[电子电信—通信与信息系统]