Adaptive OAM Mode Selection for Optical Wireless Interference Mitigation
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Solution Overview
Problem
Conventional optical wireless communication systems face challenges in maintaining decoding performance due to external interference, particularly from strong sunlight, which significantly reduces reception efficiency.
Innovation Solution
The method involves transmitting a first optical signal with a reference signal and receiving feedback information to adaptively select the orbital angular momentum (OAM) mode of a second optical signal based on the detected area in the photodiode array or distance measurements, using sensors like RADAR or LIDAR, to minimize interference and enhance reception efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional optical wireless communication is used, then the system is simple and easy to implement, but the decoding performance deteriorates due to external interference light sources like sunlight
Solution Approach 1:
The receiving UE measures the received optical signal characteristics and feeds back information to the transmitting UE. Based on this feedback, the transmitting UE adaptively adjusts the OAM mode of the transmitted signal, enabling the system to compensate for interference effects and maintain decoding performance under varying external interference conditions
Solution Approach 2:
The patent dynamically changes the OAM mode parameter of the transmitted optical signal based on feedback information or distance measurements. By varying the OAM mode index and other signal parameters adaptively, the system can distinguish between desired signals and interference, improving decoding performance in the presence of external light sources
2Reliability
If adaptive OAM mode adjustment is implemented, then the reception efficiency improves and interference is mitigated, but the device complexity increases due to feedback mechanisms and additional sensors
Solution Approach 1:
The system employs feedback from the receiving UE to the transmitting UE, where the receiver provides information about signal quality and interference conditions. This feedback loop enables adaptive adjustment of transmission parameters, improving reception efficiency while managing complexity through coordinated operation between endpoints
Solution Approach 2:
The patent integrates multiple functions into the existing communication framework, where the same optical communication infrastructure supports both data transmission and adaptive parameter adjustment. The feedback mechanism and sensor systems leverage existing components to perform multiple tasks, reducing the net increase in device complexity
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 effectively mitigates interference from external sources, including sunlight, and improves the reception efficiency of the receiving user equipment by dynamically adjusting the OAM mode based on feedback or distance sensing.
Implementation Method 1
a radius of an area in which a desired signal is detected in a photodiode array of the receiving UE
Implementation Method 2
measuring a distance to the receiving UE with a distance measurement sensor; The distance measurement sensor may include radio detection and ranging (RADAR) or light detection and ranging (LIDAR)
Data Source
AI summary
A method by which a transmission terminal transmits a signal in an optical wireless communication system can comprise: transmitting a first optical signal including a reference signal to a reception terminal having established a communication link with the transmission terminal; receiving feedback information about the first optical signal from the reception terminal; and transmitting a second optical signal to the reception terminal on the basis of the feedback information, wherein an orbital angular momentum (OAM) mode of the second optical signal can be selected on the basis of the feedback information.