MIMO Channel Simulator Reciprocal Calibration via Power Baseline
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Solution Overview
Problem
Massive MIMO systems face performance degradation due to power and phase mismatch in RF hardware, leading to poor channel reciprocity and interoperability, especially in 5G TDD communication systems, where traditional calibration methods lack link between power and phase data, resulting in inefficient calibration processes.
Innovation Solution
A method for reciprocal calibration of MIMO channel simulators that involves calibrating power across all channels to establish a baseline, using the least squares method to minimize errors, and processing differences through the baseband to unify channel states, reducing the need for extensive calibration points and improving phase consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional calibration methods are used to compensate power error and phase directly, then the calibration process is simple, but the phase consistency is poor and more calibration points are needed
Solution Approach 1:
The patent changes the calibration parameters from direct power and phase compensation to a unified power calibration approach. By calibrating only power parameters across all channels and using the relationship between power and phase, the system achieves better phase consistency without requiring separate phase calibration for each channel state, thus reducing the number of calibration points needed.
Solution Approach 2:
The patent makes the power calibration process universal by using a single power calibration value P that applies to all channels in the same state. This unified approach serves multiple purposes: it compensates for power errors across all channels simultaneously and indirectly corrects phase inconsistencies, eliminating the need for separate calibration procedures for different channel states.
2Measurement precision
If more RF link states are calibrated to avoid phase inconsistency, then phase consistency improves, but the calibration time and work increase
Solution Approach 1:
The patent applies partial action by calibrating only the power parameter once for all channels in the same state, rather than performing full calibration for each individual channel state. This partial calibration approach is sufficient to achieve the desired phase consistency because the power calibration inherently addresses the phase relationships between channels, eliminating the need for extensive multi-state calibration.
3Ease of operation
If power calibration is performed without considering RF link differences, then the calibration process is simpler, but phase compensation becomes incorrect at different power points
Solution Approach 1:
The patent applies local quality by recognizing that different RF links have different characteristics at different power points. The system calculates a specific power calibration value P for all channels in the same state, which accounts for the local power-level dependent characteristics of each RF link. This ensures that phase compensation is accurate for each specific power point while maintaining a unified calibration approach.
Data Source
AI summary
The present invention relates to a method for achieving reciprocal calibration of MIMO channel simulators, comprises the following steps: calibrate the power of the transmit and receive channels of the MIMO channel simulator and obtain power calibration data; calculate to get the power P of all channels in the same state, and use it as the baseline value for the current RF link state; calculate the difference between the calibration value and the baseline value for all channels and give the difference to the baseband for processing. The present invention also relates to a device, a processor and a computer-readable storage medium thereof for achieving reciprocal calibration of a MIMO channel simulator. The method, device, processor, and computer-readable storage medium of the present invention for achieving reciprocal calibration of a MIMO channel simulator are employed to propose an inter-channel phase calibration scheme for a large-scale MIMO system in a convenient and fast way, which greatly reduces the calibration workload. The data processing of the present invention improves the accuracy of the power, substantially reduces the phase error due to different RF configurations, and improves the interoperability of the base stations.