Bias current optimization method and system based on LED electric heating model

Abstract

The invention discloses a bias current optimization method and system based on an LED electric heating model. The method comprises the following steps: determining the magnitude of a bias current based on an illumination constraint, and calculating a needed signal constraint according to a communication performance demand; determining a modulation depth range based on the magnitude of the bias current and the signal constraints; and in the modulation depth range, determining the bias current corresponding to the maximum value of the modulation depth as the target bias current. According to the invention, the bias current can be effectively optimized according to the relationship among the current, the temperature and the luminous flux, so that the lighting effect is improved, and the communication performance can be optimized as much as possible on the basis of meeting scene lighting.

Description

technical field [0001] The present invention relates to the technical field of visible light communication, in particular to a bias current optimization method and system based on an LED electrothermal model. Background technique [0002] LEDs were originally designed for lighting rather than communication. Although 100-megabit on-off keying (OOK) and gigahertz-level orthogonal frequency division multiplexing (OFDM) have long been realized, these high-speed communication technologies often ignore LEDs have strict limitations on lighting. Visible light communication technology that takes lighting into account expects to use fast-modulating LEDs for data transmission without losing the lighting function. However, there is a strong concave characteristic between the current and the output luminous flux of the LED, and the modulation will cause the loss of luminous flux. To compensate for flux loss, an increase in bias current will be used to meet the illuminance requirements ...

Images