Visible Light Communication Noise Reduction via Wavelength Selection
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Solution Overview
Problem
Conventional short-distance communication systems using infrared light face challenges with narrow beam divergence, difficulty in establishing connections, and significant noise interference from ambient light, which limits their efficiency and reliability.
Innovation Solution
A method and apparatus for short-distance communication using visible light that involves scanning ambient light, detecting its wavelengths, measuring optical power, and selecting transmission wavelengths with a greater optical power difference to minimize noise, thereby ensuring stable communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If visible light is used for short-distance communication, then connection establishment becomes easier due to broad transmission angle, but noise from ambient light increases
Solution Approach 1:
The patent changes the wavelength parameter of transmitted light to match ambient light wavelengths, enabling the receiver to distinguish between ambient light and transmitted signals through wavelength-based filtering. This resolves the contradiction by maintaining the broad transmission angle advantage while eliminating ambient light noise through parameter matching.
Solution Approach 2:
The patent implements a feedback mechanism where the receiver detects ambient light wavelengths and feeds this information back to the transmitter. The transmitter then adjusts its transmission wavelength to match the detected ambient light wavelengths, enabling the receiver to filter out ambient noise while maintaining connection ease.
2Productivity
If multiple wavelengths are used for transmission, then communication efficiency improves, but difficulty in detecting and measuring ambient light increases
Solution Approach 1:
The patent segments the ambient light detection process by having the receiver separately detect and measure each wavelength component of ambient light. This segmented approach allows efficient multi-wavelength communication while managing the complexity of ambient light detection through systematic wavelength-by-wavelength analysis.
3Shape
If infrared light is used for communication, then beam divergence is narrow providing directionality, but connection establishment becomes difficult and requires close proximity
Solution Approach 1:
The patent inverts the conventional approach by using visible light with broad transmission angles instead of infrared light with narrow beam divergence. This inversion maintains directionality through wavelength-based identification while eliminating the close proximity requirement, allowing connection establishment over longer distances with easier alignment.
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 enhances communication quality by reducing noise interference from ambient light, allowing for more efficient and reliable short-distance communication using visible light.
Implementation Method 1
a receiver including a Photo Diode (PD) and a demodulator
Implementation Method 2
a transmitter including a Light Emitting Diode (LED) for carrying out infrared light transmission and a light modulator
Data Source
AI summary
Disclosed is a short-distance communication method and an apparatus using visible light. The apparatus scans ambient light, measures optical power of visible light, among visible light included in the ambient light, having a wavelength corresponding to a transmission wavelength used for the visible light communication, compares a minimum transmission optical power of transmitted light, a real transmission optical power, and the measured optical power of the ambient light, selects a transmission wavelength of the transmitted light on which noises caused by the ambient light have little effect, and performs the visible light communication using the visible light of the selected transmission wavelength.