可见光通信是一种新兴的无线通信方式。介绍了基于朗伯辐射模型的光线追踪算法，该算法可以精确地模拟每个光子的运动轨迹和接收过程。论述了室内可见光通信系统6种基本链路形式，并对其信道脉冲响应进行了仿真，分析了脉冲响应的成分组成和幅值特性。仿真结果表明，光源所发出的光子只有0�1％～7�2％被接收机接收，视距链路中直射光子所携带的功率占接收总功率的98�93％～99�8％，非视距链路中一次反射的光子所携带的功率占接收总功率的85�45％～98�08％。%Visible light communication is an emerging wireless communication method.The paper presents a ray⁃tracing algorithm based on Lambertian model,which can accurately simulate the moving path and receiving process of each photon.Then six types of basic links of indoor visible light communication system are presented,the impulse response of each link is simulated,and the component and amplitude of the impulse response are analyzed.The simulations show that only 0�1%~7�2%photons can be received by the receiver. The power carried by the direct photons is 98�93%~99�8% of the total power carried by the received photons in the line⁃of⁃sight link, and the power carried by the once⁃reflected photons is 85�45%~98�08% of the total power carried by the received photons in the non⁃line⁃of⁃sight link.
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