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针对室内可见光通信的特点,选择复合抛物面聚光器作为可见光通信系统光学天线,介绍了复合抛物面聚光器的几何结构和光学特性,利用光学仿真软件Trace Pro对复合抛物面聚光器进行了设计、建模与仿真.通过对不同光源条件下复合抛物面聚光器聚光特性的仿真发现:在光源为朗伯辐射模型时复合抛物面聚光器的聚光性能更好,且视场角越小增益越高;但接收端与光源的相对位置对小视场复合抛物面聚光器的实际增益有明显影响,在仿真条件下,视场角为10?的复合抛物面聚光器实际增益为22.88,比理论值降低了31%.在此基础上,在一个5 m×5 m×3 m的房间中对采用复合抛物面聚光器为光学天线的室内可见光通信系统进行了建模,分别得到了直射链路和非直射链路下房间内各个位置的光功率分布.仿真结果表明,采用一个视场角为60?的复合抛物面聚光器为光学天线,两种链路下平均接收功率分别提高了4.29 d Bm和4.77 d Bm,非直射链路比直射链路的平均接收功率提高了11.2%.
In view of the characteristics of indoor visible light communication, the compound parabolic concentrator is chosen as the optical antenna of visible light communication system. The geometry and optical characteristics of the compound parabolic concentrator are introduced. The design of the compound parabolic concentrator is carried out by the optical simulation software Trace Pro. Modeling and Simulation. Through the simulation of the condensing characteristics of the compound parabolic concentrators under different light conditions, it is found that when the light source is a Lambertian radiation model, the performance of the compound parabolic concentrator is better, and the smaller the angle of view, the smaller the gain But the relative position of the receiver and the light source has a significant impact on the actual gain of the small field of view compound parabolic concentrator. Under the simulation conditions, the actual gain of the compound parabolic concentrator with the field of view of 10? Is 22.88, The value is reduced by 31% .On the basis of this, the indoor visible light communication system using composite parabolic concentrator as the optical antenna is modeled in a room of 5 m × 5 m × 3 m, and the direct link And the distribution of optical power at different positions in the room under the non-direct link.The simulation results show that using a composite parabolic concentrator with an angle of view of 60 ° as the optical antenna, the two kinds of links Lower average received power increased by 4.29 d Bm and 4.77 d Bm, respectively, and the indirect receive link power increased by 11.2% over the direct link.