LED Power Allocation for Visible Light Communication Blockages
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Solution Overview
Problem
Existing Indoor Visible Light Communication (VLC) systems face challenges with high interference and blockage losses due to shadowing effects from obstacles, which affect communication performance and location accuracy, and current methods fail to optimize light emitting diode (LED) power allocation effectively.
Innovation Solution
A computing system and method that optimize LED power allocation within a room by identifying blockages and computing VLC channel gains to maximize data rates, using techniques like blockage generalization, Lambertian models, and Matern Hard Core Process to manage power distribution among LEDs, ensuring optimal power allocation and power savings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If LED power is increased to overcome blockage losses and shadowing effects, then communication performance is improved, but power consumption increases
Solution Approach 1:
The patent applies local quality by allocating different power levels to different LEDs based on their specific blockage conditions and channel gains. Instead of uniform power distribution, each LED transmitter receives optimized power allocation according to its local environment, including blockage detection results and computed channel gain values, thereby improving communication reliability while minimizing overall power consumption.
Solution Approach 2:
The system dynamically changes power allocation parameters based on detected blockage conditions and computed VLC channel gains. The optimization framework adjusts power distribution parameters in real-time according to environmental conditions, user locations, and blockage scenarios, allowing the system to adapt power consumption levels while maintaining communication performance.
2Measurement precision
If conventional positioning models are used to determine user location, then location accuracy is achieved, but the system fails to address blockage failures and does not optimize LED power allocation
Solution Approach 1:
The system performs preliminary blockage detection and channel gain computation before communication occurs. By identifying blockages and calculating VLC channel gains in advance, the system prepares optimized power allocation strategies proactively, enabling it to handle blockage failures more effectively while maintaining location accuracy through the enhanced positioning framework.
Solution Approach 2:
The patent implements feedback mechanisms where blockage detection results and channel gain computations inform subsequent power allocation decisions. The system continuously monitors communication conditions, detects blockages, and adjusts power allocation based on feedback from channel gain calculations, thereby improving both location accuracy and robustness against blockage failures.
3Illumination intensity
If VLC systems operate with high interference from other light sources and blockage losses, then illumination function is maintained, but communication performance suffers
Solution Approach 1:
The patent applies multi-functionality by using LEDs for both illumination and communication purposes simultaneously. The optimized power allocation framework manages the dual function by allocating power based on both illumination requirements and communication performance needs, allowing the system to maintain illumination while improving communication reliability through blockage-aware power optimization.
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
The solution enhances data rate and power savings while maintaining localization accuracy, supporting up to 70% dimming with 4 LEDs and 75% with 8 LEDs, and improves Bit Error Rate (BER) performance by optimizing power allocation based on blockage locations and constraints.
Implementation Method 1
Light-emitting diode (LED) refers to a semiconductor light source that emits light when current flows through a diode
Implementation Method 2
Light-emitting diode (LED) refers to a semiconductor light source that emits light when current flows through a diode
Implementation Method 3
the light intensity from the transmitting light-emitting-diodes (LEDs) is used to modulate the information signal which can be received at the photodetectors and converted into an electrical signal
Data Source
AI summary
A system 10 to optimize a light emitting diode (LED) power allocation framework within a room is disclosed. The system 10 includes a data receiving subsystem 20, configured to receive parameters corresponding to light emitting diodes (LED), visible light communication (VLC) transmitters and visible light communication (VLC) receivers. The system 10 includes a blockage generalization subsystem 22, configured to identify location and height of one or more detected blockages within the room from the received parameters. The system 10 includes an optimal power allocation subsystem 24, configured to compute a visible light communication (VLC) channel gain for each of the one or more light emitting diodes (LED) with reference to identified location and identified height and configured to optimize the power allocation framework to achieve maximized visible light communication (VLC) data rate based on the computed visible light communication (VLC) channel gain and one or more constraints.