Abstract
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.
Highlights
The demand for high-speed data promotes the iteration of communication technology
Visible light communication (VLC) is a new alternative with several advantages to solve the inherent problems of radio frequency communication [1], such as network endogenous safety, high spatial reuse, joint illumination and no electromagnetic pollution
This paper discusses the limitations of the communication signals applied in VLC system using light emitting diode (LED) as transmitters
Summary
The demand for high-speed data promotes the iteration of communication technology. In the existing LED design, reference [4] analyzes light flux and power consumption based on the current reorganization mechanism, considering the current and temperature dependence of LED. In reference [11], a steady-state model of LED is proposed, including the effects of current and temperature on the output luminous flux On this basis, Ref [9] considers the. Ii effect of low-frequency current ripple on LED light flux, and constructs a dynamic photoelectrothermal(PET) model that can be used to analyze the low-frequency current ripples.These previous works provide a reference for the optimal design of LED transmitter based on the electrothermal model. Our contribution: On the basis of the above-mentioned LED design, we consider the relationship among bias current Ib, modulation schemes s(t), power consumption, junction temperature Tj and light flux.
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