2D Active Antenna Array FD-MIMO Beamforming Calibration
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Solution Overview
Problem
Current 5G communication systems face challenges in accommodating high-order multi-user MIMO transmission and reception without complicating the design and implementation of base stations and user equipment, particularly due to the use of large numbers of antennas for spatially multiplexed signals.
Innovation Solution
A method for operating a base station in a wireless communication system using a full-dimensional multiple-input multiple-output (MIMO) beamforming scheme, which involves receiving signals, calibrating precoders to compensate for sample level mismatch and delay differences in CPRI connections, and adjusting phases to perform in-phase beamforming for multiple user equipments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a large number of antennas are used for high-order multi-user MIMO transmission and reception, then system throughput and data rates are improved, but device complexity and implementation difficulty increase
Solution Approach 1:
The patent segments the large-scale antenna array into multiple sub-arrays, where each sub-array is controlled by a separate RF unit. This segmentation allows the base station to manage high-order MU-MIMO transmissions by dividing the overall antenna system into smaller, more manageable units, thereby maintaining high system throughput while reducing the complexity of controlling each individual antenna element.
2Manufacturing precision
If sample level mismatch and delay differences are not compensated in CPRI connections, then device complexity is reduced, but beamforming precision and signal quality deteriorate
Solution Approach 1:
The patent implements preliminary calibration actions to detect and compensate for sample level mismatches and delay differences in CPRI connections before beamforming operations commence. By performing these calibration steps in advance, the system ensures precise beamforming without adding complexity to the real-time signal processing operations.
3Length of stationary object
If phases of multiple channels are not adjusted to be in-phase, then device complexity is reduced, but transmission distance and signal strength decrease
Solution Approach 1:
The patent employs feedback mechanisms where the base station receives signals from user equipments, performs calibration to detect phase differences across multiple channels, and adjusts the phases to be in-phase. This feedback-driven phase adjustment ensures optimal signal strength and transmission distance while managing the complexity through automated calibration procedures.
Data Source
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AI summary
The present disclosure relates to a pre 5G or 5G communication system to be provided for supporting higher data rates beyond 4G communication system such as LTE. A method for operating a large scale antenna array in a wireless communication system includes receiving one or more signals. The one or more signals include information for beamforming to a plurality of user equipments (UEs) using a full-dimensional multiple-input multiple-output (FD-MIMO) beamforming scheme. The FD-MIMO beamforming scheme includes same time resources and same frequency resources that are co-scheduled to the plurality of UEs. The method further includes identifying a time delay of the one or more signals associated with one or more antenna arrays that are distributed in the large scale antenna array and performing a multi-user (MU) joint beamforming on the one or more signals to one or more UEs.