In visible light communication (VLC) system, the intensity of light emitting diode (LED) is modulated to transmit data. As a transmitter, the design of LED should consider the performance of lighting and communication simulataneously. However, the output flux of LED is jointly determined by the electrical and thermal characteristics, and is concave-related to the forward bias current. In order to maximize the use of LEDs, in this paper, the mutual restriction of optical, electrical and thermal mechanisms for the LED systems are considered, and a dynamic photoelectrothermal model is established. Then, the optimal bias current is presented according to the electrical-thermal relationship of LED. Modulating LED at this bias current can maximize the communication performance without sacrificing the light flux. Finally, a BER experiment to verify the optimal communication performance is conducted at this bias current.

中文翻译：

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基于LED电热效应的可见光通信最优偏置电流设计


在可见光通信（VLC）系统中，通过调制发光二极管（LED）的强度来传输数据。 LED作为发射器，设计时应同时考虑照明和通信性能。然而，LED的输出光通量是由电特性和热特性共同决定的，并且与正向偏置电流呈凹相关。为了最大限度地利用LED，本文考虑了LED系统光、电、热机制的相互制约，建立了动态​​光电热模型。然后根据LED的电热关系提出最佳偏置电流。在该偏置电流下调制 LED 可以在不牺牲光通量的情况下最大限度地提高通信性能。最后，在该偏置电流下进行误码率实验来验证最佳通信性能。