OAM Communication Mode Selection for Antenna Misalignment
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Solution Overview
Problem
In OAM communication systems, misalignment between transceiving antennas leads to mode crosstalk, increasing bit error rates and reducing system performance, especially in mobile communications where deflection angles are large and variable.
Innovation Solution
A communication method and device that allows the transmitting end to select different mode combinations based on indication information from the receiving end, such as channel information or deflection angles, to maximize system capacity and improve gain by determining optimal OAM mode combinations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam control compensation measures are adopted to reduce inter-mode interference, then system performance is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamic beam control by adjusting beamforming parameters based on real-time deflection angle measurements. The system transitions from static OAM mode selection to dynamic adaptation, where the transmitting end continuously adjusts beamforming weights according to the receiving end's feedback about current alignment conditions, thereby maintaining optimal performance across varying deflection angles without requiring complex hardware modifications
Solution Approach 2:
The patent establishes a feedback mechanism where the receiving end measures the actual deflection angle and channel conditions, then sends indication information back to the transmitting end. This feedback loop enables the transmitting end to adjust its beamforming and OAM mode selection in real-time, resolving the contradiction by using information feedback to achieve adaptive optimization without permanent system complexity increases
2Reliability
If even modes are used for communication to reduce interference, then signal to interference plus noise ratio (SINR) is improved, but adaptability to varying deflection angles deteriorates
Solution Approach 1:
The patent changes the parameter selection strategy by using indication information to dynamically select from multiple OAM mode combinations rather than being restricted to even modes. The system adjusts the mode combination parameters based on the measured deflection angle, allowing optimal modes to be selected for each specific angular condition, thereby maintaining high SINR across a wide range of deflection angles
Solution Approach 2:
The system transitions from static even-mode-only communication to dynamic mode selection based on real-time deflection angle measurements. The transmitting end adapts its OAM mode combination according to the receiving end's feedback, enabling the system to maintain optimal performance across varying angular conditions rather than being constrained to fixed even modes
3Productivity
If OAM communication is implemented to increase frequency spectral efficiency, then communication capacity is improved, but sensitivity to misalignment increases
Solution Approach 1:
The patent introduces an intermediary feedback mechanism that mediates between the transmitting and receiving ends. The receiving end acts as an intermediary by measuring the actual alignment conditions and communicating this information back to the transmitter, which then adjusts its beamforming accordingly. This intermediary feedback loop enables the system to compensate for misalignment effects and maintain high spectral efficiency across varying angular conditions
Solution Approach 2:
The system implements feedback control where the receiving end measures deflection angles and channel conditions, then sends indication information to the transmitting end for adaptive adjustment. This feedback mechanism reduces sensitivity to misalignment by enabling real-time compensation through beamforming parameter adjustment, allowing the system to maintain high frequency spectral efficiency even when perfect alignment cannot be guaranteed
Data Source
AI summary
A communication method based on orbital angular momentum (OAM) is performed by a receiving end, and includes: transmitting indication information to indicate a transmitting end to determine a transmitting mode. Transmitting indication information may include determining a target OAM mode combination from preset K+1 OAM mode combinations and transmitting the indication information to indicate to determine the transmitting mode of the transmitting end based on the target OAM mode combination. It may also include one of determining channel information about a wireless channel between the receiving end and the transmitting end; and transmitting second indication information, or determining a first deflection angle between the receiving end and the transmitting end; and transmitting third indication information.