Multi-Band Polarization Rotation for PIM Interference Mitigation
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Solution Overview
Problem
Current wireless communication systems face interference issues due to passive intermodulation (PIM) which degrade signal quality and reduce network performance, especially in urban environments where multiple antennas and interference sources are present.
Innovation Solution
A radio frequency (RF) polarization shifting module/system (RPM) is introduced to mitigate PIM by rotating the polarization of orthogonal RF signals, allowing one signal to receive interference while the other remains interference-free, using hybrid couplers and mechanically-adjustable dual simultaneous phase-shifting couplers to achieve this without affecting signal orthogonality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polarization rotation is applied to mitigate PIM interference, then signal-to-interference plus noise ratio (SINR) is improved, but device complexity increases due to hybrid couplers and phase-shifting components
Solution Approach 1:
The system divides the signal processing into separate orthogonal polarization components, applying independent phase shifting to each component through hybrid couplers. This segmentation allows interference mitigation on one polarization while preserving the other, achieving SINR improvement without requiring complete system redesign.
Solution Approach 2:
Hybrid couplers serve as intermediary devices that decouple the orthogonal polarization components, enabling independent phase manipulation of each component. These intermediaries facilitate the polarization rotation function while maintaining signal orthogonality, resolving the contradiction between interference mitigation and system complexity.
2Reliability
If mechanically-adjustable phase-shifting couplers are used for polarization rotation, then interference mitigation capability is improved, but ease of operation deteriorates due to mechanical adjustment requirements
Solution Approach 1:
The system employs mechanically-adjustable phase-shifting couplers that enable dynamic control of polarization rotation angles. This dynamic adjustability allows the system to adapt to different interference scenarios and optimize SINR for each specific situation, improving interference mitigation capability while providing flexibility in operation.
3Adaptability or versatility
If polarization rotation is implemented across multiple frequency bands, then adaptability is improved, but device complexity increases due to multi-band signal processing requirements
Solution Approach 1:
The hybrid coupler and phase-shifting architecture is designed to process multiple frequency bands simultaneously through the same physical components. The orthogonal polarization separation and phase rotation mechanisms work across different bands without requiring separate processing paths, achieving multi-band adaptability while avoiding proportional increases 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
The RPM effectively mitigates PIM by selectively isolating interference, improving signal-to-interference plus noise ratio (SINR) and enhancing communication channel performance, particularly in multi-band and multi-antenna configurations.
Implementation Method 1
A radio frequency (RF) polarization shifting module/system (RPM) is introduced to mitigate PIM by rotating the polarization of orthogonal RF signals
Data Source
AI summary
Aspects of the subject disclosure may include, for example, obtaining data regarding interference originating from one or more interference sources, and electronically rotating polarizations of signals relating to crossed-dipole radiating elements of an antenna system, the antenna system operating in multiple frequency bands, the electronically rotating being performed for a select number of frequency bands of the multiple frequency bands and facilitating mitigation of the interference. Other embodiments are disclosed.