Visible Light Communication Color Code Modulation Chromaticity Balancing
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Solution Overview
Problem
Visible light communication systems face challenges in maintaining color balancing when using high order modulation schemes, as arbitrarily moving constellations increase distance between points but fail to display color white, degrading communication performance and color balancing.
Innovation Solution
A method and apparatus that determine first and second coordinates values on a chromaticity diagram to maintain color balancing by emitting visible rays corresponding to specific color ratios, with compensation symbols ensuring the points are aligned to display color white, allowing for increased distance between constellation points for improved communication performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the constellation is arbitrarily moved to increase the distance between points, then communication performance is improved, but color balancing deteriorates and color white cannot be displayed
Solution Approach 1:
The constellation is segmented into two distinct sets: information symbols for data transmission and compensation symbols for color balancing. This segmentation allows each set to serve its specific function independently, resolving the contradiction between communication performance and color balancing
Solution Approach 2:
Compensation symbols act as intermediaries that counterbalance the color distortion introduced by information symbols. These intermediary elements restore color white without interfering with the information carried by the information symbols, enabling both improved communication performance and maintained color balancing
2Productivity
If high order modulation is used to increase data transmission speed, then productivity is improved, but communication performance deteriorates when color balancing is maintained
Solution Approach 1:
The modulation scheme is segmented into information symbols carrying high-order modulation data and separate compensation symbols. This allows high order modulation to be used for productivity while the compensation symbols ensure color balancing is maintained, preventing communication performance degradation
Solution Approach 2:
The chromaticity coordinates of compensation symbols are specifically calculated based on the information symbols' coordinates to maintain color balancing. By changing the parameter selection for compensation symbols, the system enables high order modulation without sacrificing communication performance
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
Enables high-speed data transmission using high order modulation while maintaining color balancing, enhancing communication performance by ensuring the distance between constellation points is increased without compromising color balancing.
Implementation Method 1
A visible light communication system emits visible lights rays corresponding to a blue, green, red, and white color of the LED through the CCM using a chromaticity diagram
Implementation Method 2
an optical filter for filtering a visible ray corresponding to a compensation symbol among visible rays transmitted from a transmission apparatus
Data Source
AI summary
A visible light communication system and method for transmitting and receiving an information symbol in a visible light communication system for a Color Code Modulation (CCM) scheme using a chromaticity diagram. The method includes determining a first coordinates value corresponding to an information symbol to be transmitted on the chromaticity diagram; determining a first color ratio corresponding to the first coordinates value; determining a second coordinates value corresponding to a compensation symbol for compensating for the first color ratio into a color white and determining a second color ratio corresponding to the second coordinates value; and emitting a visible ray corresponding to each of the first color ratio and second color ratio. The first and second coordinates values are located on a line on the chromaticity diagram.