Adaptive Baud Rate for Light-Based Communication
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Solution Overview
Problem
Existing light-based communication (LCom) systems face challenges in setting a compatible baud rate across various mobile computing devices due to differences in camera configurations, processing power, and orientations, leading to inefficiencies in data transmission and reception, particularly in indoor navigation applications where GPS and Wi-Fi technologies are inadequate.
Innovation Solution
The method involves adaptively adjusting the baud rate of luminaires based on decoding parameters received from the receiver device through wireless channels like Bluetooth or WiFi, considering factors such as camera shutter speed, frame resolution, and orientation, to ensure optimal data transmission and reception, allowing for dynamic and real-time adjustments to accommodate different device configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed baud rate is used for LCom transmission, then the system is simple to implement, but compatibility across different mobile devices with varying camera configurations is poor
Solution Approach 1:
The patent implements dynamic baud rate adjustment where the luminaire adapts its transmission rate based on the receiver device's camera capabilities. The system determines device-specific parameters (shutter speed, frame rate, resolution) and calculates an optimal baud rate dynamically, rather than using a fixed rate. This resolves the contradiction by making the system adaptable to different devices while managing complexity through automated parameter determination.
Solution Approach 2:
The patent changes the transmission parameter (baud rate) based on the receiver device's characteristics. By modifying the baud rate parameter according to camera shutter speed, frame rate, and resolution, the system achieves compatibility across different devices. This parameter adaptation resolves the technical contradiction between versatility and implementation complexity.
2Speed
If the baud rate is increased for faster data transmission, then transmission speed improves, but decoding accuracy decreases due to device-specific camera limitations
Solution Approach 1:
The patent optimizes the baud rate parameter by considering the receiver device's camera parameters (shutter speed, frame rate, resolution). The system calculates an optimal baud rate that balances transmission speed with the device's ability to accurately decode the light-based signal. This resolves the contradiction by adapting the transmission speed to match the receiver's capabilities rather than using a universally high rate.
Solution Approach 2:
The system incorporates feedback from the receiver device's capabilities to adjust the transmission parameters. By receiving information about camera specifications and calculating the appropriate baud rate based on this feedback, the system ensures both speed and accuracy are optimized for the specific device-receiver pair.
3Reliability
If the baud rate is decreased to ensure decoding accuracy, then decoding reliability improves, but transmission efficiency and speed decrease
Solution Approach 1:
The patent dynamically adjusts the baud rate parameter based on the receiver device's camera capabilities rather than using a conservatively low fixed rate. By calculating the optimal rate that matches the device's shutter speed and frame rate, the system achieves both high reliability and maximum transmission efficiency for each device.
Solution Approach 2:
The system implements dynamic baud rate selection that adapts to each receiver device's capabilities. This dynamic approach allows the system to achieve high decoding reliability while maintaining transmission efficiency, rather than being constrained by a universally low rate that would reduce productivity across all devices.
4Adaptability or versatility
If device-specific parameters are determined and baud rate is dynamically adjusted, then compatibility and decoding accuracy improve, but system complexity and processing requirements increase
Solution Approach 1:
The patent implements dynamic parameter determination and baud rate adjustment based on the receiver device's camera specifications. The system automatically queries device capabilities (shutter speed, frame rate, resolution) and calculates the appropriate transmission rate, achieving high compatibility while managing processing complexity through automated algorithms.
Solution Approach 2:
The system performs self-configuration by automatically determining the receiver device's capabilities and setting the appropriate baud rate without requiring manual intervention. This self-service approach achieves device compatibility while minimizing the complexity burden on the user, as the system handles the processing requirements autonomously.
Data Source
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AI summary
Light-based communication (LCom) techniques are disclosed for adaptively adjusting the baud rate of a luminaire to optimize the LCom signal transmitted for an intended receiver device. The adaptive baud rate can be adjusted by a process that includes: determining decoding parameters of the receiver device, the device including a camera for receiving LCom signals, and a display. The process further includes calculating a baud rate suitable for the receiver device based on the decoding parameters, and causing the baud rate to be set at the luminaire. The process may further include at least one of: verifying the baud rate at the receiver device; adjusting the decoding parameters of the receiver device if baud rate cannot be adjusted to meet a current configuration of decoding parameters; and prompting a user to rotate receiver device to improve orientation of the luminaire with respect to a raster direction of the camera.