Transceiver Calibration for Massive MIMO Arrays
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Solution Overview
Problem
Current wireless communication technologies face challenges in calibrating transceivers for large-scale and Massive MIMO deployments, particularly in reciprocity-based MU-MIMO systems, due to high signaling overhead and limitations in calibrating non-collocated antenna arrays, which affect the accuracy and reliability of downlink MU-MIMO transmissions.
Innovation Solution
A method for relative calibration of transceiver units using multiple signaling resource slots, where non-overlapping groups of transceiver units broadcast and receive pilots simultaneously, allowing for the selection of relative calibration parameters based on observations to assess and improve calibration quality, enabling reliable calibration of larger arrays with lower overhead and flexibility in signaling protocols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional calibration methods (e.g., Argos internal self-calibration) are used for large-scale MIMO deployments, then calibration can be performed without over-the-air feedback, but the calibration accuracy deteriorates for non-collocated antenna arrays and large arrays
Solution Approach 1:
The patent divides the large antenna array into multiple non-overlapping groups that can be calibrated simultaneously through group-based pilot signaling. This segmentation allows the calibration system to handle large arrays by processing them in manageable groups, maintaining calibration accuracy across the entire array while simplifying the overall calibration operation.
Solution Approach 2:
The patent extends calibration from traditional pairwise element comparison to multi-dimensional group-based calibration using multiple signaling resource slots. By introducing temporal dimension (multiple slots) and group structure, the system achieves higher calibration accuracy for large and non-collocated arrays while maintaining operational efficiency.
2Area of stationary object
If calibration is performed for larger arrays using traditional methods, then array size coverage increases, but signaling overhead increases significantly
Solution Approach 1:
The patent merges multiple calibration operations into group-based simultaneous calibration. By having multiple transceiver units exchange pilots in organized groups across multiple resource slots, the system calibrates larger arrays with reduced overhead compared to traditional sequential or pairwise calibration methods.
Solution Approach 2:
The patent uses non-overlapping groups for pilot exchange, where only specific groups transmit pilots in each resource slot rather than all transceivers. This partial action approach reduces signaling overhead while still achieving complete array calibration through systematic group coverage across multiple slots.
3Productivity
If multiple transceiver units exchange pilots simultaneously in groups, then calibration efficiency improves, but system complexity increases
Solution Approach 1:
The patent segments the transceiver array into non-overlapping groups that operate independently in different resource slots. This segmentation reduces system complexity by breaking down the complex multi-transceiver calibration problem into simpler group-based operations, while maintaining high calibration efficiency through parallel group processing.
4Adaptability or versatility
If conventional calibration methods are used for non-collocated antenna arrays, then deployment flexibility is maintained, but calibration reliability deteriorates
Solution Approach 1:
The patent applies local quality by optimizing calibration for specific group configurations and non-collocated scenarios. The group-based calibration method adapts to local array geometries and collocation conditions, maintaining deployment flexibility while improving calibration reliability through tailored group formation and pilot exchange strategies.
Data Source
AI summary
A method and apparatus is disclosed herein for wireless transceiver calibration. In one embodiment, the method for relative calibration of multiple transceiver units for their use for joint transmission from groups of transceiver units to at least one other wireless entity, wherein each transceiver unit includes an antenna element, comprises: exchanging pilots using multiple signaling resource slots, using at least two non-overlapping groups of transceiver units; and performing calibration of transceiver units in the first and second groups of transceiver units, including choosing relative calibration parameters to control calibration and using a metric to assess calibration, where the metric is based on at least one combination of calibration parameters and the observations of each transceiver group in at least two groups of transceiver units based the simultaneous pilot broadcast and subsequent reception between transceiver units in pairs of groups of transceiver units.