OAM Mode Multiplexing Correction Circuit
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Solution Overview
Problem
Existing OAM mode multiplexing transmission systems face high circuit implementation costs and feedback delays due to the computational intensity of singular value decomposition, leading to divergent corrections and degraded communication quality when antennas are tilted or vibrated by wind and vibration.
Innovation Solution
An OAM mode multiplexing transmission apparatus with a UCA antenna, a correction circuit, and a correction value calculation circuit connected to a database or calculation apparatus, which regularly calculates and feeds back correction values for signal phase rotation using an ideal MIMO channel matrix, reducing the need for singular value decomposition and incorporating an LPF for stable corrections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If singular value decomposition is performed to obtain correction values for antenna tilt and RF circuit characteristics, then correction accuracy is improved, but calculation cost and circuit implementation cost increase significantly
Solution Approach 1:
The patent extracts only the necessary correction information (phase rotation values) from the channel matrix without performing complete singular value decomposition. By using the relationship between actual and ideal channel matrices, the system obtains correction values through simpler calculations, eliminating the need for complex SVD operations while maintaining correction effectiveness.
Solution Approach 2:
The patent uses the ideal channel matrix as a reference model to compare against the actual channel matrix. By copying the structure and relationships from the ideal case, the system can derive correction values through straightforward matrix operations rather than complex decomposition, reducing computational complexity while preserving accuracy.
2Measurement precision
If correction values are calculated using singular value decomposition, then correction precision is improved, but feedback time increases causing divergence of corrections
Solution Approach 1:
The patent extracts only the essential correction parameters (phase rotation values) directly from channel matrix comparison, avoiding the time-consuming singular value decomposition process. This extraction approach provides correction values quickly enough to prevent divergence while maintaining sufficient precision for effective correction.
Solution Approach 2:
The patent performs preliminary calculations by establishing the relationship between ideal and actual channel matrices in advance. This preparation allows the system to quickly derive correction values when needed, reducing feedback time and preventing correction divergence while maintaining precision.
3Reliability
If repetitive corrections are performed to handle antenna vibrations, then communication quality is maintained, but calculation overhead increases without LPF causing divergence
Solution Approach 1:
The patent implements a feedback mechanism where correction values are regularly calculated and applied to compensate for antenna tilt and vibrations. By continuously monitoring channel changes and applying corrections based on the difference between actual and ideal channel matrices, the system maintains communication quality while preventing correction divergence through controlled feedback loops.
Data Source
AI summary
The OAM mode multiplexing transmission apparatus includes a UCA antenna, a correction circuit, a correction value calculation circuit that calculates correction values, and a correction value feedback part that regularly feeds back the correction values from a receiving end to a transmitting end. The correction value calculation circuit is connected to a database that stores information about an ideal MIMO channel matrix, which is calculated by using an array diameter of the UCA antenna, a number of antenna elements, an RF frequency, and a link distance as parameters, in a state in which transmission and reception UCA antennas face each other, or is connected to a calculation apparatus that calculates the information. The correction value calculation circuit regularly calculates the correction values relating to signal phase rotation by using a MIMO channel matrix estimated with known signals embedded in received transmission frames and the ideal MIMO channel matrix.