2D Antenna Array Segmentation for 1D CSI Feedback
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Solution Overview
Problem
Acquiring and processing channel state information (CSI) for large-scale two-dimensional antenna arrays in wireless communication systems is challenging due to channel estimation complexity and overhead, limiting the effectiveness of beamforming and interference mitigation.
Innovation Solution
A method involving the division of a two-dimensional antenna array into one-dimensional vertical and horizontal CSI-RS port arrays, with intra-sub-array and inter-sub-array antenna aggregation, allowing for separate elevation and azimuth CSI feedback and dynamic point selection for improved beamforming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a two-dimensional antenna array is used for full-dimensional MIMO, then beamforming gain and system capacity are improved, but channel estimation complexity and CSI feedback overhead increase significantly
Solution Approach 1:
The patent divides the two-dimensional antenna array into multiple one-dimensional sub-arrays (vertical and horizontal separations). Each sub-array is processed independently to acquire CSI, which simplifies the channel estimation complexity while maintaining the beamforming gain of the full 2D array. This segmentation allows the system to handle large-scale antenna arrays without proportionally increasing processing complexity.
Solution Approach 2:
The patent transforms the two-dimensional antenna array problem into multiple one-dimensional problems by separating the array into vertical and horizontal sub-arrays. This dimensionality reduction allows CSI to be acquired independently for each 1D sub-array, significantly reducing the feedback overhead and processing complexity compared to acquiring CSI for the entire 2D array as a single entity.
2Productivity
If a two-dimensional antenna array is used for full-dimensional MIMO, then system capacity is improved, but CSI feedback overhead increases
Solution Approach 1:
The patent segments the 2D antenna array into multiple 1D sub-arrays, allowing CSI feedback to be transmitted separately for each sub-array. This segmentation reduces the total feedback overhead compared to transmitting CSI for the entire 2D array, while still enabling the system to achieve high capacity through coordinated transmission across all sub-arrays.
Solution Approach 2:
By converting the 2D array into multiple 1D sub-arrays, the patent reduces the dimensionality of the CSI feedback problem. Each 1D sub-array requires less feedback information than the full 2D array, and the combined information from multiple 1D sub-arrays is sufficient to achieve high system capacity through coordinated multi-point transmission.
3Measurement precision
If separate elevation and azimuth CSI feedback is acquired, then beamforming precision for high-rise users is improved, but processing complexity increases
Solution Approach 1:
The patent separates the antenna array into vertical sub-arrays for elevation CSI and horizontal sub-arrays for azimuth CSI. This segmentation allows independent processing of elevation and azimuth dimensions, which simplifies the overall processing complexity compared to handling the full 2D array simultaneously, while maintaining high beamforming precision for high-rise users through dedicated elevation optimization.
Data Source
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AI summary
Methods and corresponding apparatuses for wireless communication are disclosed. The method for wireless communication includes dividing a two-dimensional antenna array to a plurality of sub-arrays, mapping the two-dimensional antenna array into a one-dimensional vertical channel state information reference signal (CSI-RS) port array for receiving elevation CSI feedback and a one-dimensional horizontal CSI-RS port array for receiving azimuth CSI feedback, and transmitting one or more elevation CSI-RS from the one-dimensional vertical CSI-RS port array and one or more azimuth CSI-RS from the one-dimensional horizontal CSI-RS port array. Methods and corresponding apparatuses for CSI feedback mechanism are also disclosed.