Antenna Directivity Adjustment Using XPD Feedback
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Solution Overview
Problem
Existing antenna-directivity adjustment techniques face challenges in accurately adjusting antennas for optimal directivity, especially in cross-polarization multiplexing transmission, due to inter-polarization interference, requiring highly experienced technicians and precise angle adjustments to minimize bit-error degradation and cross-polarization discrimination (XPD) issues.
Innovation Solution
An antenna-directivity adjustment system that includes a measurement module to acquire angle information and received-signal levels for both vertical and horizontal polarizations, calculates cross-polarization discrimination, and generates notification information to help technicians adjust antenna angles for maximum received-signal levels and improved XPD, simplifying the adjustment process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cross-polarization multiplexing transmission is used to increase communication capacity, then communication capacity is improved, but inter-polarization interference occurs causing degradation of communication quality
Solution Approach 1:
The system measures received signal levels for both vertical and horizontal polarizations, calculates cross-polarization discrimination (XPD) values, and provides real-time feedback to technicians through display devices. This feedback mechanism enables technicians to adjust antenna rotation angles based on quantitative XPD measurements, thereby minimizing inter-polarization interference while maintaining cross-polarization multiplexing transmission for high communication capacity.
2Object-affected harmful factors
If precise antenna rotation angle adjustment is required to minimize inter-polarization interference, then communication quality is improved, but adjustment difficulty increases requiring highly experienced technicians
Solution Approach 1:
The system replaces subjective technician expertise with an automated measurement and calculation system. The antenna rotation angle adjustment mechanism remains mechanical, but the determination of the optimal angle is substituted by electronic measurement of received signal levels and automated calculation of XPD values, eliminating the need for highly experienced technicians.
Solution Approach 2:
The system enables technicians to independently adjust antenna rotation angles using objectively measured XPD values displayed on notification devices, without requiring external guidance or highly specialized knowledge. The measurement and calculation system serves the technician by providing clear adjustment targets.
3Measurement precision
If multiple parameters (received signal level and cross-polarization discrimination) are measured and displayed, then adjustment accuracy is improved, but device complexity increases
Solution Approach 1:
The antenna adjustment measurement system performs multiple functions: it measures received signal levels for vertical polarization, measures received signal levels for horizontal polarization, calculates XPD values from these measurements, and displays both the signal levels and XPD values. This multi-functional approach achieves high adjustment accuracy without requiring separate dedicated devices for each measurement type.
Data Source
AI summary
Antenna-directivity adjustment is implemented by adjusting an antenna of a radio communication device in horizontal, vertical, and rotation angles in response to received-signal levels and cross-polarization discriminations. Received-signal levels (RSL) are measured by moving the antenna of the radio communication device in horizontal and vertical directions. Cross-polarization discriminations (XPD) are calculated according to received-signal levels (RSL) measured by changing vertical polarization and horizontal polarization on a transmit side and a receive side with the antenna when rotated and an interference level measured between vertical polarization and horizontal polarization. An antenna direction is adjusted to maximize received-signal levels and cross-polarization discriminations.