LED Array Beamforming for Visible Light Communication
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current RF communication methods face limitations in data transmission rates and channel capacities as the volume and size of data files grow, necessitating alternative data transmission methods between devices.
Innovation Solution
A visible light communication (VLC) system using an array of light emitting diode (LED) elements that sinusoidally vary intensity to generate a data carrying light beam within a specific information region, while maintaining uniform intensity outside this region, allowing for efficient data transmission through constructive and destructive interference of light signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If RF communication methods are used for data transmission, then existing communication infrastructure can be utilized, but data transmission rates and channel capacities become insufficient as data volume grows
Solution Approach 1:
The patent substitutes RF electromagnetic wave-based communication with visible light-based communication. By replacing the traditional RF frequency band with visible light spectrum, the system achieves significantly higher data transmission rates and channel capacities, directly resolving the insufficiency of existing RF communication infrastructure for growing data demands
2Productivity
If light intensity is varied to transmit data, then high-speed data transmission is enabled, but illumination uniformity may be compromised
Solution Approach 1:
The patent applies local quality by differentiating the function of different spatial regions. Within the information beam region, light intensity is sinusoidally varied to encode data, while outside this region, uniform illumination is maintained. This spatial differentiation allows simultaneous achievement of high-speed data transmission and homogeneous illumination without mutual interference
3Productivity
If beamforming is implemented to concentrate light in a specific direction, then data transmission efficiency improves, but light distribution uniformity deteriorates
Solution Approach 1:
The patent segments the light distribution into two distinct components: an information beam region where sinusoidal intensity variations carry data, and an ambient illumination region that provides uniform lighting. This segmentation allows beamforming to concentrate data transmission efficiency in the information beam region while maintaining overall light distribution uniformity through the ambient illumination component
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 while maintaining homogeneous illumination, similar to RF beamforming, by controlling the phase and amplitude of sinusoidal light variations, thus overcoming the limitations of traditional RF communication methods.
Implementation Method 1
A data carrying light beam can be generated within an information beam region by constructively combining sinusoidal intensity variations of the emitted omni-directional light
Implementation Method 2
uniform intensity light can be generated outside the information beam region by destructively combining the sinusoidal intensity variations of the emitted omni-directional light
Implementation Method 3
The optical receiver can be a photodetector
Data Source
AI summary
Examples of information beamforming technology for visible light communication (VLC) systems are provided. A VLC system can include an array of light emitting diode (LED) elements that can emit omni-directional light and control circuitry that can control individual LED elements of the array to sinusoidally vary the intensity of the omni-directional light emitted from the individual LED elements. A data carrying light beam can be generated within an information beam region by constructively combining sinusoidal intensity variations of the emitted omni-directional light and uniform intensity light can be generated outside the information beam region by destructively combining the sinusoidal intensity variations. The VLC system can include an optical detector that can detect sinusoidal intensity variations of a data carrying light beam and generate an output signal corresponding to the sinusoidal intensity variations. The output signal can be converted into digital symbols corresponding to the detected sinusoidal intensity variations.