Optical Wireless Communication Simultaneous Positioning and Data
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Solution Overview
Problem
Current optical wireless communication technologies, such as Li-Fi, cannot simultaneously perform device positioning and inter-device communication, limiting their integration and effectiveness in real-time communication scenarios.
Innovation Solution
An optical wireless communication method that uses constant envelope modulation with direct current bias signals, allowing a communication device to receive and process signals from multiple nodes to determine location information and decode information bit streams, enabling simultaneous positioning and communication by distinguishing nodes through different carrier frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If VLC technology is used for positioning or communication, then positioning or communication can be implemented, but positioning and communication cannot be implemented simultaneously
Solution Approach 1:
The patent applies multi-functionality by enabling the VLC system to perform both positioning and communication functions simultaneously through a unified signal structure. The optical signals carry both location information and data information through different signal components, allowing the same hardware infrastructure to support multiple functions without requiring separate systems.
Solution Approach 2:
The patent merges positioning and communication functions into a single integrated system. By combining location information and data information into the same optical signal transmission channel, the system eliminates the need for separate positioning and communication infrastructure, reducing overall system complexity while achieving functional integration.
2Measurement precision
If multiple nodes transmit optical signals for positioning, then positioning accuracy is improved, but signal differentiation and information decoding become more difficult
Solution Approach 1:
The patent applies local quality by assigning different signal characteristics to different nodes. Each node's optical signal contains unique location information and data information that can be differentiated through signal processing. This allows the receiver to identify and process signals from multiple nodes simultaneously while maintaining the ability to distinguish individual node contributions.
Solution Approach 2:
The patent uses parameter changes by encoding node-specific information into the optical signals. Different nodes transmit signals with distinct characteristics that allow the receiving device to differentiate between nodes through signal analysis, enabling accurate positioning even when multiple nodes transmit simultaneously.
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 reliable and simultaneous device positioning and inter-device communication by accurately identifying nodes and calculating power attenuation percentages, improving communication quality and efficiency in environments where both functions are required.
Implementation Method 1
The optical communication device receives optical signals separately transmitted by N nodes; and obtains, based on the received optical signals of the N nodes, first parameters that are of the N nodes and that are used to locate the optical communication device
Data Source
AI summary
The present disclosure relates to optical wireless communication methods and devices. In one example method, a first communication device receives optical signals separately transmitted by N nodes, and obtains, based on the received optical signals of the N nodes, first parameters that are of the N nodes and that are used to locate the first communication device and an information bit stream corresponding to each node. The optical signals are obtained by the nodes by performing electrical-to-optical conversion on a first signal, the first signal is a signal obtained by adding a direct current bias signal to a second signal, and the second signal is a signal obtained after constant envelope modulation is performed on an information bit stream to be sent by a light source node to the first communication device.