Optical Camera Communication Light Source Mode Indication
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Solution Overview
Problem
Existing optical camera communication systems based on undersampled pulse width modulation (UPWM) primarily support single-light source communication, lacking a method to efficiently transmit data using multiple light sources in a multi-light source scenario.
Innovation Solution
A communication method and apparatus that utilize multiple light sources by adding a mode indication to physical frames, allowing for either diversity or multiplexing modes, enabling simultaneous data transmission and increasing transmission efficiency by indicating the sending mode and, if necessary, providing port indications for specific light source information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple light sources are used for communication, then transmission efficiency is improved, but system complexity increases due to lack of mode indication mechanism
Solution Approach 1:
The patent segments the communication system into distinct operational modes (diversity mode and multiplexing mode) with clear mode indications in physical frames. This segmentation allows the system to handle multiple light sources through structured frame formats with mode indication fields, thereby improving transmission efficiency while managing system complexity through organized protocol design.
Solution Approach 2:
The patent implements dynamic mode switching capability where the communication system can adapt between diversity mode and multiplexing mode based on channel conditions and requirements. The mode indication field in physical frames enables dynamic selection of transmission strategies, allowing the system to optimize performance while maintaining manageable complexity through flexible adaptation.
2Reliability
If diversity mode is used with multiple light sources, then transmission reliability is improved, but data processing complexity increases at the receiving end
Solution Approach 1:
The patent incorporates mode indication information in advance within physical frames before data transmission. This preliminary action allows the receiving end to pre-configure the appropriate processing strategy based on the indicated mode, thereby improving transmission reliability through diversity combining while reducing data processing complexity by eliminating the need for real-time mode detection and decision-making.
3Productivity
If multiplexing mode is used with multiple light sources, then spectral utilization is improved, but frame structure complexity increases
Solution Approach 1:
The patent designs a universal physical frame structure that can accommodate both diversity mode and multiplexing mode through a common mode indication field. This multi-functional frame design enables the system to achieve improved spectral utilization through multiplexing while managing frame structure complexity by using a unified format that adapts to different operational modes rather than requiring separate complex structures for each mode.
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 efficient data transmission using multiple light sources in optical camera communication systems, enhancing transmission efficiency by determining the sending mode and parsing data based on mode and port indications, thus overcoming the limitations of single-light source systems.
Implementation Method 1
for one LED optical signal, a photodiode (photodiode, PD) may serve as a photodetector
Data Source
AI summary
Embodiments of this application disclose a communication method and an apparatus, and relate to the communications field, to resolve a problem of how to simultaneously perform transmission by using a plurality of light sources and increase transmission efficiency in a multi-light source scenario in an optical camera communications system. A specific solution is: generating N physical frames, where each of the physical frames includes a preamble, a mode indication, and valid data, the mode indication is used to indicate a sending mode of N light sources, the sending mode is a diversity mode or a multiplexing mode, and N is a positive integer greater than or equal to 2; and sending the N physical frames by using the N light sources, where one light source sends one physical frame. The embodiments of this application are used in an optical camera communication process.