Antenna Array Misalignment Compensation Using Pilot Signal Phase
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Solution Overview
Problem
Existing wireless communication systems face performance losses due to antenna array misalignment, which can occur from rotational and parallel shifts, affecting communication quality between devices.
Innovation Solution
Techniques for estimating and compensating antenna array misalignment by performing alignment compensation based on phase differences and parallel shifts using pilot signals, including mechanical and digital compensation methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If antenna arrays are used for wireless communication, then communication capacity and data rate are improved, but misalignment between antenna arrays causes performance loss and communication quality degradation
Solution Approach 1:
The system transmits pilot signals through antenna arrays and measures the received signal characteristics (phase differences, amplitude ratios) to detect misalignment. This feedback mechanism enables continuous monitoring and correction of array alignment, maintaining communication quality while utilizing multiple antennas for high capacity transmission
Solution Approach 2:
Instead of using mechanical adjustment mechanisms to physically align antenna arrays, the patent employs signal processing methods. By analyzing phase differences and amplitude ratios of pilot signals, the system calculates misalignment parameters and applies digital beamforming or phase correction to compensate for the misalignment, replacing mechanical adjustment with electronic correction
2Reliability
If alignment compensation techniques are implemented, then communication quality is improved, but system complexity and processing requirements increase
Solution Approach 1:
The system performs alignment compensation calculations using pilot signals transmitted before actual data communication. By pre-determining the misalignment parameters (rotation angles, parallel shifts) through pilot signal analysis, the system prepares correction factors in advance, reducing the processing burden during actual data transmission and simplifying the overall system operation
Solution Approach 2:
The alignment compensation mechanism is integrated into the existing wireless communication protocol stack. The system uses its own transmitted pilot signals to detect its own misalignment condition and performs self-correction through beamforming adjustments or phase compensation, eliminating the need for external alignment equipment or complex additional hardware
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.