Antenna Polarization Adjustment for 5G Interference and PIM Mitigation
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Solution Overview
Problem
The increasing complexity of 5G networks and coexistence of multiple wireless services and networks leads to interference and passive intermodulation (PIM) issues, which affect uplink sensitivity, coverage, and performance in antenna systems, particularly in MIMO configurations.
Innovation Solution
An interference/PIM cancellation system that adjusts polarization and phase of antenna elements in the intermediate region, using physical and electronic adjustments to mitigate interference by selectively receiving or canceling it, thereby optimizing the near-field and far-field regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple wireless services and networks coexist in 5G systems, then network capacity and service diversity are improved, but interference and passive intermodulation (PIM) increase
Solution Approach 1:
The patent segments the antenna system into multiple independently controllable antenna elements with distinct polarization orientations. Each element can be individually adjusted to receive signals from different spatial directions and polarizations, allowing the system to separate desired signals from interfering signals by selecting specific antenna elements and polarization states.
Solution Approach 2:
The patent introduces polarization orientation as an additional dimension for signal separation beyond traditional spatial filtering. By adjusting the polarization angles of antenna elements, the system creates new degrees of freedom to distinguish between co-channel signals and interference, effectively adding a dimensional layer to the signal reception strategy.
2Reliability
If polarization adjusting is performed to mitigate interference, then uplink sensitivity is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamic polarization adjustment where the polarization orientations of antenna elements can be changed in real-time based on detected interference conditions. This dynamic adaptability allows the system to optimize uplink sensitivity for different scenarios without requiring complex fixed-structure antenna designs, as the polarization states are adjusted programmatically based on channel conditions.
Solution Approach 2:
The system performs self-adjustment of polarization orientations based on automatically detected interference patterns and channel state information. The base station or user equipment autonomously determines the optimal polarization configurations without requiring manual intervention or complex external control systems, reducing overall system complexity while maintaining high uplink sensitivity.
3Productivity
If guard bands and duplexer requirements are reduced, then spectrum efficiency is improved, but interference mitigation capability deteriorates
Solution Approach 1:
The patent changes the polarization parameter of antenna elements to achieve signal separation instead of relying on frequency separation through guard bands. By adjusting polarization angles and orientations, the system can distinguish between uplink and downlink signals or between different user signals in the same frequency band, enabling guard band reduction while maintaining interference mitigation capability.
Solution Approach 2:
The patent segments the signal reception process into multiple polarization channels, allowing simultaneous reception of multiple signals with different polarizations. This segmentation enables the system to handle TDD and FDD operations with reduced guard bands by spatially and polarization-wise separating signals that would otherwise require frequency or time separation.
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
Enhances uplink performance and coverage by minimizing interference/PIM through selective signal extraction and antenna usage, allowing for reduced guard bands and duplexer requirements in TDD and FDD systems.
Implementation Method 1
An interference/PIM cancellation system that adjusts polarization and phase of antenna elements in the intermediate region
Data Source
AI summary
Aspects of the subject disclosure may include, for example, performing, by an adjusting mechanism associated with a communications system, polarization adjusting for an uplink of the communications system, and performing, by the adjusting mechanism, polarization adjusting for a downlink of the communications system, wherein a first polarization of the uplink and a second polarization of the downlink are different. Other embodiments are disclosed.