Visible Light Receiver Attenuation for Saturation-Resistant Data Links
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Solution Overview
Problem
Visible light communication (VLC) systems are limited by short transmission range, signal saturation, and noise interference due to quantization characteristics of current receivers and sensors, which restrict data rates and reliability in environments with varying brightness.
Innovation Solution
Implementing a method and system that dynamically adjusts attenuation in VLC receivers using electronically controlled filters and gain exposure compensators to improve quantization, allowing the system to differentiate between signal and noise saturation, thereby enhancing dynamic range and signal-to-noise ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If VLC systems use traditional quantization methods in receivers, then the system structure remains simple, but the transmission range and data rates are limited due to signal saturation and noise interference
Solution Approach 1:
The patent implements dynamic attenuation adjustment in the receiver, where the attenuation level is continuously adapted based on the received signal strength and quantization characteristics. This dynamic mechanism allows the receiver to optimize its performance for different transmission conditions, thereby extending transmission range and improving data rates without requiring a completely complex fixed structure
Solution Approach 2:
The patent changes the quantization parameter (number of bits) dynamically based on the received signal conditions. By adjusting the quantization precision adaptively, the system can maintain high transmission reliability over longer distances and at higher data rates while managing receiver complexity through intelligent parameter selection rather than hardware complexity
2Adaptability or versatility
If VLC receivers operate in environments with varying brightness, then the system can be used in diverse applications, but signal saturation occurs when vehicle lights or ambient light exceed the receiver's quantization range
Solution Approach 1:
The patent employs dynamic attenuation adjustment that adapts to varying ambient light conditions and vehicle light intensities. By continuously adjusting the attenuation level based on the received signal strength, the receiver maintains optimal measurement precision across diverse environmental conditions, preventing signal saturation while preserving the ability to detect weak signals
Solution Approach 2:
The patent implements a feedback mechanism where the receiver monitors the received signal strength and quantization output, then adjusts the attenuation level accordingly. This closed-loop control ensures that the receiver maintains high measurement precision in varying brightness conditions by preventing both signal saturation and excessive attenuation, thereby preserving signal detection accuracy across different environments
3Reliability
If VLC systems increase the receiver's quantization range to handle bright lights, then signal saturation is reduced, but the dynamic range for detecting weaker signals is compressed
Solution Approach 1:
The patent implements dynamic attenuation adjustment that adapts to the received signal strength. When strong signals are detected, attenuation is increased to prevent saturation; when weak signals are detected, attenuation is reduced to preserve detection capability. This dynamic approach maintains both saturation resistance and weak signal detection capability across varying signal conditions
Solution Approach 2:
The patent dynamically changes the attenuation parameter based on the received signal conditions and quantization characteristics. By adjusting this parameter adaptively, the system can handle both bright lights without saturation and weak signals with sufficient detection precision, resolving the trade-off between these two opposing requirements
4Reliability
If VLC receivers use fixed attenuation levels, then the device complexity is reduced, but the data rates and transmission range are limited by inability to adapt to varying signal conditions
Solution Approach 1:
The patent implements dynamic attenuation adjustment where the attenuation level is continuously adapted based on the received signal strength and quantization output. This dynamic mechanism extends transmission range and improves data rates by optimizing the receiver's sensitivity to match current signal conditions, while the control mechanism remains relatively simple by leveraging existing receiver components
Solution Approach 2:
The patent enables the receiver to automatically adjust its own attenuation level based on its own received signal conditions and quantization characteristics. This self-service mechanism eliminates the need for complex external control systems while improving data rates and transmission range through adaptive attenuation 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
Enhances the range and data rates of VLC systems by improving the dynamic range and signal-to-noise ratio, enabling effective communication in noisy and varying light conditions.
Implementation Method 1
a photodetector or image sensor can receive
Data Source
AI summary
A visible light communication apparatus comprising: sources configured to transmit a data signal; and a receiver comprising: measurement areas configured to sense and quantize energy from the sources, and attenuators configured to attenuate energy from the sources, by a step attenuation, based at least in part on a value of the sensed and quantized energy; the receiver being configured to determine whether the sensed and quantized energy saturated the measurement areas.