Visible light communication system
A technology of visible light communication and driving signal, which is applied in the field of visible light communication, can solve problems such as signal distortion, and achieve the effect of avoiding too large or too small driving current
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[0023] As mentioned in the background art section, in the prior art, there is a phenomenon of signal distortion in the process of using LEDs to realize communication.
[0024] The inventor found that this is due to the fact that the relationship between the input and output of the LED presents nonlinear characteristics. Take the actual LED (OSRAM, SFH4230) as an example, such as figure 1 as shown, figure 1 A schematic diagram of the relationship between LED voltage and current is shown in . From figure 1 It can be seen that the quasi-linear range of the LED is very limited. Once the amplitude of the input signal is too large, it will cause saturation distortion, and once the amplitude is too small, it will cause cut-off distortion, that is, the current or voltage at both ends of the LED cannot be too large or too high. Small, only when the voltage at both ends is within a limited range, can it work normally, otherwise it will cause very serious distortion, or even fail to w...
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