Massive MIMO Antenna Phase Calibration via Orthogonal Code Grouping
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Solution Overview
Problem
The massive MIMO system faces a significant challenge in reducing the time required for antenna calibration, which increases the burden on the system and disrupts communication services as it necessitates stopping typical communication services during the calibration process, especially due to the large number of antennas involved.
Innovation Solution
The method involves grouping antennas into preset numbers, configuring feedback paths, and using test signals with orthogonal codes to efficiently calculate phase calibration values, thereby reducing the overall calibration time by processing multiple antennas simultaneously.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If antenna calibration is performed on each antenna individually in a massive MIMO system, then phase alignment accuracy is improved, but calibration time increases significantly
Solution Approach 1:
The patent segments the massive antenna array into multiple groups, where each group is calibrated independently using separate calibration signals. This allows parallel processing of calibration for different antenna groups, reducing total calibration time while maintaining phase alignment accuracy within each group through group-specific calibration procedures
Solution Approach 2:
The patent combines calibration signals for multiple antenna groups into a composite calibration signal that can be transmitted simultaneously. By merging the calibration processes and using signal separation techniques at the receiver, the system achieves parallel calibration of multiple antenna groups, significantly reducing calibration time compared to sequential individual calibration
2Reliability
If antenna calibration is performed frequently to maintain phase alignment, then communication quality is improved, but system burden increases due to service interruption
Solution Approach 1:
The patent performs preliminary calibration by establishing feedback paths during initial system setup or during low-traffic periods. By pre-configuring the calibration infrastructure and testing signal paths before full operation, the system minimizes the impact of subsequent calibration activities on normal communication services, maintaining quality without excessive service interruptions
Solution Approach 2:
The patent enables continuous or near-continuous calibration by implementing incremental calibration procedures that can occur during normal operation. Rather than complete recalibration requiring full service interruption, the system performs continuous phase tracking and adjustment, maintaining communication quality while keeping productivity high through minimal service disruption
Data Source
AI summary
The present disclosure relates to a 5G or pre-5G communication system for supporting a higher data transfer rate than a 4G communication system such as LTE. The method is for phase correction of an antenna in a large-capacity antenna system, the method includes grouping large-capacity antennas into a predetermined number of groups; setting a path such that ports of the grouped antennas have a feedback path; outputting a test signal to be outputted to each antenna port of each group by adding a code or sequence having orthogonality; separating signals for each antenna port in the group by using the code or sequence having orthogonality in a signal received through the feedback path; and calculating a calibration value by detecting a phase change of the separated signal.