Channel Feedback Codewords for Near-Field MIMO Accuracy
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Solution Overview
Problem
In hyper-scale MIMO systems, the accuracy of channel information feedback is low for UEs located in the near field of the antenna array, affecting transmission performance due to the non-linear relationship between the phase of codeword elements and antenna indices.
Innovation Solution
A channel information feedback method using higher-degree polynomials of the antenna index to determine codeword elements, ensuring accurate reflection of the phase relationship and enhancing correlation between codewords and channel information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional feedback scheme based on linear phase relationships is used, then the system is simple to implement, but the accuracy of channel information feedback is low for near-field UEs
Solution Approach 1:
The patent changes the mathematical model from linear phase relationships to higher-degree polynomial relationships (quadratic, cubic, or higher) to describe the phase relationship between codeword elements and antenna indices. This parameter change in the mathematical model enables accurate representation of spherical wave propagation in near-field scenarios, resolving the contradiction by improving measurement precision through a more sophisticated but manageable computational approach.
Solution Approach 2:
The patent introduces dynamic adaptability by allowing the system to select different polynomial degrees (linear, quadratic, cubic, or higher) based on the UE's location relative to the antenna array. This dynamic approach enables the system to switch between simple linear models for far-field UEs and more complex polynomial models for near-field UEs, thereby improving accuracy when needed while maintaining simplicity when possible.
2Productivity
If the antenna array size is increased to support more users, then the system capacity is improved, but the near-field range expands causing more UEs to experience low feedback accuracy
Solution Approach 1:
The patent addresses this contradiction by changing the phase relationship model from linear to higher-degree polynomials. This allows the system to maintain high feedback accuracy even as the antenna array size increases and more UEs fall into the near-field region, thereby supporting increased system capacity without sacrificing measurement precision for near-field users.
3Reliability
If a higher-degree polynomial is used to determine codeword elements, then the correlation between codeword and channel information is improved, but the computational complexity increases
Solution Approach 1:
The patent implements dynamic adaptability by allowing the system to select the appropriate polynomial degree based on the UE's location. For far-field UEs, the simple linear model is used, maintaining low complexity. For near-field UEs, higher-degree polynomials are employed to improve reliability. This dynamic selection resolves the contradiction by adjusting the complexity level according to actual system needs.
Data Source
AI summary
A channel information feedback method, including: performing channel measurement to acquire channel information; determining a target codeword from a codeword set according to the channel information, where at least one codeword element of at least one codeword in the codeword set is determined according to a higher-degree polynomial of an index, and the target codeword is used to characterize the channel information; and feeding back indication information of the target codeword.