Base Station Antenna Polarization for PIM Source Shape Estimation
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Solution Overview
Problem
Existing methods for locating passive intermodulation (PIM) interference sources in cellular base stations, particularly on rooftops, are cumbersome, costly, and often ineffective, requiring manual testing and equipment that is bulky and disruptive to network operations.
Innovation Solution
A PIM finder system that utilizes a base station's own transmission and reception components to generate controlled illumination signals, leverage beamforming and angle of arrival techniques, and analyze polarization to detect, measure, and locate PIM sources without manual intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual testing methods are used to locate PIM sources, then detection capability is achieved, but device complexity and operation difficulty increase
Solution Approach 1:
The base station uses its own transmission and reception components to perform PIM detection, eliminating the need for external specialized equipment. The system self-illuminates and self-measures, converting the base station into its own testing instrument and thereby reducing device complexity while maintaining detection capability
Solution Approach 2:
The base station's existing transmission and reception components are made multi-functional by enabling them to perform both normal communication operations and PIM detection functions. This universal usage of components eliminates the need for separate specialized testing equipment, reducing overall system complexity
2Measurement precision
If manual testing procedures are employed, then PIM sources can be located, but loss of time and productivity decrease
Solution Approach 1:
The automated self-testing system performs PIM detection without requiring manual intervention, continuously monitoring and automatically locating PIM sources. This eliminates the time-consuming manual testing process while maintaining accurate localization capability
Solution Approach 2:
The system enables continuous PIM monitoring and detection operations without interrupting base station functionality. The automated nature of the system allows for ongoing detection activities, eliminating the downtime associated with manual testing procedures
3Measurement precision
If conventional PIM detection equipment is used, then interference sources can be detected, but ease of operation deteriorates due to bulky equipment and disruptive testing
Solution Approach 1:
The base station performs PIM detection using its own integrated components, eliminating the need to transport and set up bulky external equipment. The system operates autonomously using existing infrastructure, greatly improving ease of operation
Solution Approach 2:
The system uses the base station's existing signal processing components as intermediaries to perform PIM detection. By leveraging the already-present transmission and reception components, the system avoids introducing external bulky equipment while maintaining detection precision
4Measurement precision
If manual testing is performed on active networks, then PIM sources can be located, but network stability and reliability worsen due to operational disruption
Solution Approach 1:
The base station performs self-detection using its own components during normal operation, eliminating the need to interrupt service for manual testing. The system continuously monitors PIM conditions without affecting network stability
Solution Approach 2:
The system maintains continuous base station operation while simultaneously performing PIM detection. The automated detection process occurs in the background without interrupting normal communication services, preserving network stability and avoiding downtime
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
Facilitates faster, more reliable, and less disruptive detection and localization of PIM sources, reducing the need for manual testing and minimizing network downtime.
Implementation Method 1
causing an antenna system to transmit a linearly-polarized radio frequency (RF) signal at different polarization angles
Data Source
AI summary
Aspects of the subject disclosure may include, for example, detecting an interference signal in two or more signals received via orthogonally-polarized elements of an antenna system, the interference signal originating from a passive intermodulation (PIM) source, measuring a polarization of the interference signal, by comparing the two or more signals, to estimate a shape of the PIM source, and generating information regarding the shape to facilitate locating of the PIM source. Other embodiments are disclosed.