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对可见光通信系统收发端进行了研究,采用分压限流式调制电路驱动LED,以NJM4556AD运算放大器为核心器件作为接收端,搭建了短距离可见光通信测试系统,实验完成了50Hz~50kHz频率信号的有效传输,通过优化接收端成功实现了语音信号的实时传输。实验表明,随着频率的增加信号质量逐渐变差,随着接收端偏离光源准直程度的增加,接收功率逐渐变小,甚至信号无法恢复,并分析了影响信号恢复的主要因素,优化电路后所传输的语音信号能够比较清晰地还原。实验结果对可见光通信的室内应用具有一定的参考价值。
The receiving and dispatching end of visible light communication system is studied. The LED is driven by the partial pressure and current limiting modulation circuit, and the NJM4556AD operational amplifier is taken as the receiving end. A short distance visible light communication test system is set up. The experiment completed 50Hz ~ 50kHz frequency signal Effective transmission, by optimizing the receiver successfully realized the voice signal real-time transmission. Experiments show that with the increase of the frequency, the quality of the signal gets worse. With the increase of the degree of collimation at the receiving end deviating from the light source, the received power becomes smaller and even the signal can not be recovered. The main factors affecting the signal recovery are analyzed. The transmitted voice signal can be more clearly restored. The experimental results have certain reference value for the indoor application of visible light communication.