OAM Mode-Multiplexing Beam Control for Axis Misalignment Compensation
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Solution Overview
Problem
Current radio transmission methods using orbital angular momentum (OAM) mode-multiplexing face deterioration in characteristics due to axis misalignment between transmitting and receiving Uniform Circular Arrays (UCAs), with no effective method to detect or compensate for this misalignment.
Innovation Solution
A control apparatus and method that includes a transmitting UCA with phase adjustment means and acquisition of axis misalignment information, allowing for automatic beam control to compensate for axis misalignment by adjusting the phases of OAM mode-multiplexing signals, and an adaptively-controlled receiving UCA that forms and transmits information about axis misalignment to the transmitting apparatus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If OAM mode-multiplexing transmission is performed using UCAs, then high-capacity radio transmission is achieved, but transmission characteristics deteriorate due to axis misalignment between transmitting and receiving UCAs
Solution Approach 1:
The patent applies preliminary action by acquiring axis misalignment information before performing OAM mode-multiplexing transmission, and pre-calculating compensation amounts based on this information. The phase adjustment is prepared in advance to compensate for the anticipated axis misalignment, thereby preventing characteristic deterioration before it occurs during transmission.
Solution Approach 2:
The patent implements feedback by acquiring axis misalignment information from the receiving UCA and using this information to adjust the phase of transmitted signals. The system continuously monitors the alignment status and dynamically adjusts transmission parameters based on the feedback, ensuring optimal transmission characteristics despite axis misalignment.
2Reliability
If beam control is used to compensate for axis misalignment, then transmission characteristics are improved, but a method to detect the type and magnitude of axis misalignment is required
Solution Approach 1:
The patent applies universality by enabling the receiving UCA to perform multiple functions: it both receives OAM mode-multiplexing signals and detects axis misalignment information. The same receiving apparatus that is necessary for OAM reception also provides the alignment detection function, eliminating the need for separate detection devices and reducing overall system complexity.
Solution Approach 2:
The patent implements self-service by having the receiving UCA generate and provide its own axis misalignment information to the transmitting side. The receiving apparatus uses its internal measurements to create compensation data, which is then fed back to the transmitter, allowing the system to self-correct without external intervention or additional complex detection equipment.
3Reliability
If phase adjustment means is added to the transmitting UCA, then axis misalignment compensation is enabled, but device complexity increases
Solution Approach 1:
The patent applies parameter changes by adjusting the phase parameter of transmitted signals based on acquired axis misalignment information. Instead of adding complex mechanical alignment mechanisms, the system changes the electrical phase parameter dynamically to compensate for misalignment, achieving reliable compensation through simple parameter adjustment rather than structural complexity.
Data Source
AI summary
An OAM mode-multiplexing transmitting apparatus includes an OAM transmitting processing unit, a phase adjustment unit, a transmitting radio unit, a UCA (Uniform Circular Array) antenna, and a control unit (control apparatus). The UCA antenna includes a plurality of transmitting antenna elements. In the control apparatus, an acquisition unit acquires “information corresponding to a transmitting-side axis misalignment”. A beam control unit controls a beam of the UCA antenna by controlling phases of N OAM mode-multiplexing signals based on the acquired “information corresponding to the transmitting-side axis misalignment”.