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为了研究室内多个白光LED构成的室内无线信道的特性,首先分析了多LED通信系统的基本构成,然后分析了光线追迹法求脉冲响应的基本原理和基本方法,提出了用简化的光线追迹法计算信道的脉冲响应,这种方法仅仅考虑三次以下的反射情况。最后,用数值仿真方法对室内信道的脉冲响应进行了研究。仿真结果表明,系统的脉冲响应以直接响应和一阶响应为主,并随接收器和发射装置的位置不同而发生变化。
In order to study the characteristics of indoor wireless channels composed of multiple white LEDs in the room, the basic structure of multi-LED communication system is analyzed first. Then the basic principle and basic method of seeking the impulse response by ray tracing method are analyzed. Trace method to calculate the channel impulse response, this method only considers three times the following reflection. Finally, the impulse response of indoor channel is studied by numerical simulation method. The simulation results show that the impulse response of the system is dominated by the direct response and the first-order response, and varies with the positions of the receiver and launcher.