Visible Light Communication Adaptive Reference Voltage Circuit
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Solution Overview
Problem
Existing visible light communication systems require a highly satisfactory light environment and are prone to high bit error rates due to low robustness to interference, especially when using a constant reference voltage.
Innovation Solution
A visible light communication system that converts source signal data into a binary code stream to control a light emitting device, and a signal receiver that filters the resulting voltage amplitude signal to suppress frequencies around the visible light signal, using the voltage difference to generate a level signal, allowing the reference voltage to vary with ambient light conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a constant reference voltage is used in the differential amplification circuit, then the circuit structure is simple, but the system becomes highly sensitive to ambient light conditions and requires a highly satisfactory light environment to operate
Solution Approach 1:
The patent applies the dynamics principle by transforming the static constant reference voltage into a dynamic adaptive reference voltage. The reference voltage is generated by filtering the output of the photoelectric conversion device to extract the ambient light component, which automatically adjusts according to ambient light conditions. This dynamic adjustment enables the system to adapt to varying light environments without increasing circuit complexity significantly.
Solution Approach 2:
The patent introduces an intermediary filtering mechanism between the photoelectric conversion device and the differential amplification circuit. This intermediary (the filter) processes the raw output signal to separate the ambient light component from the modulation signal, using it as the reference voltage. This intermediary structure resolves the contradiction by providing an adaptive reference that improves light environment adaptability while maintaining relatively simple circuit implementation.
2Ease of manufacture
If a constant reference voltage is used, then the circuit implementation is straightforward, but the bit error rate increases under varying ambient light conditions
Solution Approach 1:
The patent implements dynamics by making the reference voltage adaptive rather than constant. The reference voltage dynamically tracks ambient light changes through filtering the photoelectric conversion output, which automatically compensates for ambient light variations. This dynamic approach reduces bit error rates under varying ambient light conditions while keeping the circuit implementation relatively straightforward through the use of standard filtering techniques.
Solution Approach 2:
The patent applies feedback by using the filtered ambient light component as a reference that feeds back into the differential amplification circuit. This feedback mechanism allows the system to automatically compensate for ambient light variations by comparing the modulation signal against the adaptive reference, thereby reducing bit error rates without significantly complicating the circuit implementation.
3Device complexity
If the reference voltage is fixed, then the system is simple to implement, but the system becomes vulnerable to interference from flickering ambient light
Solution Approach 1:
The patent applies the taking out principle by extracting the ambient light component from the total light signal through filtering. The filter separates the low-frequency ambient light (including flickering components) from the high-frequency modulation signal. This extracted ambient light component is then used as the reference voltage, which cancels out the harmful flickering light noise in the differential amplification process, thereby reducing susceptibility to interference without significantly increasing system complexity.
Solution Approach 2:
The patent introduces a filtering intermediary that processes the photoelectric conversion output to create an adaptive reference voltage. This intermediary structure eliminates the direct harmful effect of flickering ambient light by using the filtered ambient light component as reference, thereby reducing noise susceptibility while maintaining relatively simple system implementation through standard filtering components.
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 enables the visible light communication system to operate effectively across a wide range of light environments and reduces bit error rates by improving adaptability to brightness and robustness against flickering light noise.
Implementation Method 1
the signal receiver is configured to convert the visible light signal into a first voltage amplitude signal
Data Source
AI summary
The invention discloses a visible light communication system and method, and related devices, and in this solution, a visible light signal emitted by a light emitting device can be converted into a first voltage amplitude signal, a first filter process can be performed on the first voltage amplitude signal to obtain a second voltage amplitude signal in which the amplitude of the voltage signal around the frequency range of the visible light signal is suppressed, and the visible light signal can be converted into a level signal according to the voltage difference between the second voltage amplitude signal and the first voltage amplitude signal, to thereby address the problems of a required highly satisfactory light environment, low robustness to interference, a high bit error rate, etc., in visible light communication based upon constant reference voltage.