Beam Domain Optical Wireless Communication System
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current optical wireless communication systems face limitations in supporting simultaneous multi-user communication and bidirectional communication due to the correlation of channels in optical transmitter units, which restricts user capacity and adaptability to directional communication needs.
Innovation Solution
A beam domain optical wireless communication method and system that utilizes an optical transmitter unit array and lens to form multiple beams covering different regions, enabling simultaneous communication with multiple user terminals and bidirectional communication by using linear precoding or beam division multiple access techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple optical transmitter unit arrays are deployed at different positions to enable simultaneous multi-user communication, then user capacity is improved, but device complexity and system cost increase
Solution Approach 1:
The patent segments the optical transmitter unit array into multiple independent optical transmitter units, each capable of forming independent beams in different directions. This allows a single array to serve multiple users simultaneously through spatial beam separation, eliminating the need for multiple separate arrays while maintaining high user capacity
Solution Approach 2:
The patent introduces beam direction as an additional dimension for user separation. Instead of only using spatial position (multiple arrays at different locations), the system uses beam forming to create directional separation within a single array, adding the angular dimension to the communication space and enabling multiple users to be served simultaneously without increasing physical array count
2Device complexity
If traditional optical wireless communication is used, then system structure is simple, but channel correlation limits data stream transmission to one stream
Solution Approach 1:
The patent segments the single optical channel into multiple independent beam channels, each directed toward different spatial regions. This beam segmentation allows multiple data streams to be transmitted simultaneously through the same physical optical transmitter array, breaking the single-stream limitation while keeping the system structure relatively simple
Solution Approach 2:
The patent transforms the single-channel optical communication into multi-channel communication by introducing the beam direction dimension. Each beam represents an independent communication channel, allowing parallel data stream transmission without requiring multiple physical transmitter arrays, thus maintaining structural simplicity while enhancing productivity
3Device complexity
If optical transmitter units are used without beam forming, then system structure is simple, but spatial resolution is low and cannot support beam domain communication
Solution Approach 1:
The patent segments the optical transmission into multiple directed beams, each with focused energy in specific spatial directions. This beam segmentation provides high spatial resolution by concentrating optical energy into narrow angular sectors, enabling precise spatial targeting and beam domain communication while adding minimal structural complexity through lens integration
4Device complexity
If unidirectional communication is implemented, then system design is simple, but adaptability to bidirectional communication needs is poor
Solution Approach 1:
The patent implements bidirectional communication capability within the same beam domain framework. The optical transmitter array can switch between transmitting different data streams to different users, and the system can accommodate both uplink and downlink communications using the same beam forming technology, making the system universally applicable to various communication scenarios without requiring separate unidirectional systems
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 significantly enhances spatial resolution, user capacity, and system transmission rate, improves spectrum and power efficiency, and facilitates secure bidirectional communication with a large number of users.
Implementation Method 1
the optical signal transmitted by each optical transmitter unit is refracted to some direction through the lens, thereby having an energy centralization feature depending on a transmitting angle, so as to form one beam
Data Source
AI summary
The invention discloses a beam domain optical wireless communication method and system. A base station is equipped with an array of optical transceiver ports or transmitter/receiver ports and a lens, each optical transceiver port forms a beam with centralized energy through the lens, and the base station generates beams in different directions by using the optical transceiver port array and the lens, thereby realizing multi-beam coverage or large-scale beam coverage in a communication region. The base station transmits/receives signals of multiple or a large number of user terminals by using channel state information of each user terminal, and different optical transceiver ports transmit/receive signals in different directions, thereby realizing simultaneous communication and bidirectional communication between the base station and different user terminals.