Codebook-Based CSI Feedback for Multi-Panel Antenna Arrays
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Solution Overview
Problem
Existing codebooks for channel state information feedback in massive MIMO systems are designed for uniform antenna arrays and fail to provide accurate beam precision when dealing with multi-panel arrays having uneven spacings, leading to decreased system performance.
Innovation Solution
A codebook-based channel state information feedback method that includes a precoding matrix indicator (PMI) to indicate a target precoding matrix and a parameter value corresponding to a block codebook difference parameter, where the codebook is pre-generated based on configuration parameters, including the quantity and length of block codebooks, and incorporates phase and modulus differences between adjacent panels to improve beam directivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If existing codebooks designed for uniform antenna arrays are used, then device complexity is reduced, but beam precision deteriorates when dealing with multi-panel arrays having uneven spacings
Solution Approach 1:
The codebook is segmented into multiple block codebooks, each corresponding to a specific panel configuration. This allows the system to select appropriate codebook segments based on the actual antenna array structure, thereby maintaining beam precision for multi-panel arrays with uneven spacings while keeping each individual block codebook relatively simple.
Solution Approach 2:
Different block codebooks are designed with different local characteristics to match specific panel configurations. Each block codebook contains precoding matrices optimized for particular spacing patterns, enabling local adaptation to the actual antenna structure without requiring complete redesign of the entire codebook system.
2Ease of operation
If existing codebooks are used for multi-panel arrays with uneven spacings, then ease of operation is improved, but system performance deteriorates due to beam shape distortion
Solution Approach 1:
The system dynamically selects appropriate block codebooks based on the actual panel configuration and spacing parameters. This dynamic adaptation allows the codebook to be easily operated through simple selection mechanisms while maintaining high system performance by using codebook blocks that match the actual antenna structure.
Solution Approach 2:
The codebook system incorporates parameters describing panel configurations and spacing patterns. By changing these parameters, the system can select or generate appropriate codebook blocks that match the actual antenna array, thereby maintaining ease of operation through parameter-based selection while ensuring reliable system performance through accurate beamforming.
3Ease of manufacture
If linear phase compensation is applied to multi-panel arrays with uneven spacings, then ease of manufacture is improved, but manufacturing precision deteriorates because the beam shape cannot be accurately obtained
Solution Approach 1:
Instead of applying uniform linear phase compensation across all panels, the invention applies different phase compensation characteristics to different block codebooks based on their corresponding panel configurations. This local adaptation ensures that each codebook block accurately reflects the specific spacing pattern of its associated panels, thereby achieving precise beam shapes while maintaining ease of manufacture through standardized block structures.
Solution Approach 2:
The phase compensation parameters are changed to match the specific spacing patterns of different panel configurations. Each block codebook contains precoding matrices with phase parameters optimized for particular spacing patterns, allowing accurate beam shape generation while maintaining simple, manufacturable codebook structures through parameter-based differentiation.
Data Source
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AI summary
Embodiments of the present invention provide a codebook-based channel state information feedback method and a device. The method includes: sending, by user equipment UE, a precoding matrix indicator PMI to a transmission/reception point TRP, where the PMI is used to indicate a target precoding matrix and a parameter value that corresponds to a block codebook difference parameter, where the target precoding matrix is a precoding matrix in a codebook; the codebook is a codebook pre-generated by the UE based on a codebook configuration parameter; at least some precoding matrices in the codebook are obtained through transformation from precoding matrices in block codebooks and the parameter value; there are at least two block codebooks; there is a correspondence between a quantity of parameter values and a quantity of block codebooks; the codebook configuration parameter includes the quantity of block codebooks in the codebook and a length of a vector corresponding to a precoding matrix in the block codebook; and the block codebook is formed based on a preset precoding matrix. According to the embodiments, beam precision and system performance can be improved.