Visible Light Communication Using Chromaticity Coordinates
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Solution Overview
Problem
Existing visible light communication techniques face challenges in increasing data rate due to increased transmission error rates caused by decreased light intensity on the transmission path, especially when using lighting devices as light sources, and struggle to achieve data rates beyond the response limit of the light source.
Innovation Solution
A visible light communication system utilizing a plurality of light emitters emitting different colors, with a chromaticity coordinates calculator and light intensity controller to map digital values to chromaticity coordinates and control light intensities, and a reception apparatus with light receivers having different spectral characteristics to demodulate digital values from chromaticity coordinates, thereby increasing data rate without significantly increasing transmission errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiplexed data is transmitted by modulating light intensity, then data rate increases, but transmission error rate increases due to decreased light intensity on transmission path
Solution Approach 1:
The patent changes the modulation parameter from light intensity to chromaticity coordinates. By mapping digital values to chromaticity coordinates and controlling the color output of light emitters accordingly, the system achieves high data rates while maintaining transmission reliability. The chromaticity coordinates serve as the new modulation parameter that does not suffer from intensity attenuation effects.
2Productivity
If light intensity is used for data transmission, then existing techniques can be implemented, but data rate cannot exceed response limit of light source
Solution Approach 1:
The patent changes the modulation parameter from light intensity to chromaticity coordinates. By mapping digital values to chromaticity coordinates and controlling the color output of light emitters accordingly, the system achieves high data rates while maintaining transmission reliability. The chromaticity coordinates serve as the new modulation parameter that does not suffer from intensity attenuation effects.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables the transmission of multiple-value data exceeding the number of light sources while maintaining a low transmission error rate, even with light intensity attenuation, thereby achieving high-speed data transmission.
Implementation Method 1
a plurality of light emitters for emitting light in different colors
Implementation Method 2
Light Emitting Diodes (LEDs) or the like
Implementation Method 3
a plurality of light receivers having different spectral characteristics
Data Source
AI summary
A visible light communication system having a transmission apparatus for modulating a transmission signal to a multiple-value number and a reception apparatus for demodulating a multiple-value modulated transmission signal is provided. The transmission apparatus includes a plurality of light emitters for emitting light in different colors, a chromaticity coordinates calculator for mapping a digital value to a chromaticity coordinates value, and a light intensity controller for controlling a light intensity of each of the light emitters based on the chromaticity coordinates value corresponding to the digital value. The reception apparatus includes a plurality of light receivers having different spectral characteristics, a chromaticity coordinates calculator for calculating a chromaticity coordinates value according to a received light intensity detected by each of the light receivers, and a demodulator for demodulating the digital value from the chromaticity coordinates value.