OAM Reception Apparatus Interference Compensation
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Solution Overview
Problem
Current radio communication systems lack a method for receiving signals wirelessly transmitted using a combination of orbital angular momentum (OAM) transmission and dual polarized wave transmission with effective inter-polarization interference compensation.
Innovation Solution
An OAM reception apparatus and method that includes multiple reception antenna elements, OAM reception units, and interference compensation units to separate and compensate for interference components between vertically and horizontally polarized waves, allowing for the reception of OAM mode multiplexed signals transmitted using both polarizations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dual polarized wave transmission with OAM mode multiplexing is implemented, then the transmission capacity and spectral efficiency are improved, but inter-polarization interference occurs between vertically and horizontally polarized waves
Solution Approach 1:
The patent converts the harmful inter-polarization interference into a useful signal component by treating the leaked polarization components as additional received signals. The interference compensation unit uses these leaked components to reconstruct and subtract the interference from the original signals, transforming what was previously harmful into a beneficial resource for interference cancellation.
Solution Approach 2:
The patent introduces an interference compensation unit as an intermediary component that mediates between the mixed polarized signals and the final demodulated output. This unit calculates interference components based on leakage ratios and subtracts them from the received signals, acting as a buffer that cleans the signals before they reach the demodulation stage.
2Device complexity
If conventional sequential processing of spatial demultiplexing and inter-polarization interference compensation is used, then the device complexity is reduced, but the reception accuracy deteriorates due to independent processing stages
Solution Approach 1:
The patent merges the spatial demultiplexing and inter-polarization interference compensation operations into a single integrated processing stage. Instead of performing these operations sequentially and independently, the system executes them simultaneously in one processing pass, allowing the weight matrices to account for both spatial separation and polarization interference compensation together, thereby improving reception accuracy without significantly increasing device complexity.
3Productivity
If OAM mode multiplexed signals with dual polarized waves are transmitted, then the spectral efficiency is improved, but the signal quality deteriorates due to polarization leakage and interference
Solution Approach 1:
The patent implements a feedback mechanism where the received signals from both vertical and horizontal polarizations are used to calculate interference components, which are then subtracted from the original signals. The system uses the actual received signal quality to adjust the interference compensation in real-time, creating a closed-loop system that maintains signal quality despite polarization leakage.
Data Source
AI summary
An interference compensation unit in an OAM reception apparatus removes the interference component caused by horizontally polarized waves relative to vertically polarized waves from a first mode vertical component reception signal obtained by an OAM reception unit using both a first mode horizontal component reception signal and a second mode horizontal component reception signal.