Antenna Array Alignment Compensation for Rotation Misalignment
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Solution Overview
Problem
Antenna array misalignment in wireless communication systems leads to performance loss, particularly in line-of-sight communications, affecting multiplexing gain and communication quality between devices.
Innovation Solution
Techniques for estimating and compensating antenna array misalignment through mechanical and digital compensation methods, including rotation and parallel shift estimation using pilot signals, to improve communication quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If antenna arrays are used for wireless communication, then communication capacity and multiplexing gain are improved, but misalignment between antenna arrays causes performance loss and communication quality degradation
Solution Approach 1:
The patent applies preliminary action by performing alignment compensation before main communication operations. The receiving node estimates misalignment parameters (rotation angles, parallel shifts) using pilot signals and communicates these to the transmitting node, which then compensates for misalignment before data transmission. This preliminary compensation ensures optimal communication quality from the start.
Solution Approach 2:
The patent implements feedback by having the receiving node estimate misalignment parameters from received pilot signals and communicate these parameters back to the transmitting node. The transmitting node uses this feedback information to adjust its beamforming and antenna array configuration, creating a closed-loop system that maintains optimal communication performance.
2Manufacturing precision
If mechanical compensation methods are used to correct antenna array misalignment, then alignment precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces mechanical compensation methods with digital signal processing techniques. Instead of physically adjusting antenna array positions or orientations using mechanical actuators, the system uses beamforming algorithms and signal processing to compensate for misalignment. This substitution maintains alignment precision while significantly reducing device complexity and cost.
Solution Approach 2:
The patent applies parameter changes by adjusting beamforming parameters (phase shifts, amplitude weights) based on estimated misalignment parameters. Rather than changing physical antenna positions, the system dynamically modifies signal parameters to compensate for rotation and parallel shift misalignments, achieving precise alignment through software control.
3Reliability
If digital beamforming is used for communication, then communication quality is improved, but sensitivity to antenna array misalignment increases
Solution Approach 1:
The patent addresses misalignment sensitivity by performing preliminary estimation of misalignment parameters using pilot signals before main communication begins. The receiving node calculates rotation angles and parallel shifts from pilot signals and communicates these to the transmitting node, which compensates beforehand. This preliminary action eliminates the harmful effects of misalignment before they can degrade communication quality.
Solution Approach 2:
The patent reduces misalignment sensitivity through feedback mechanisms where the receiving node continuously estimates misalignment parameters from received signals and communicates them to the transmitting node. This real-time feedback enables dynamic adjustment of beamforming parameters to compensate for misalignment, maintaining communication quality despite sensitivity to positional errors.
Data Source
AI summary
Certain aspects relate to techniques for estimating and compensating for antenna array rotation of a wireless node. For example, the antenna array of the wireless node may rotate about one or more of an x-axis, a y-axis, and a z-axis, which may misalign the antenna array relative to another antenna array of another wireless node, causing degradation of communications between the two nodes. In some examples, the wireless node may obtain, from a first antenna array of the other wireless node via a second antenna array of the first wireless node, a first pilot signal and a second pilot signal via a first beam. In some examples, the first wireless node may perform a first alignment compensation based on a phase difference between the first pilot signal and the second pilot signal.