UE-Specific Codebook Design for Non-Uniform Antenna Spacing
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Solution Overview
Problem
Current uplink codebook designs for 5G NR systems assume uniform antenna spacing, which is not feasible in practice, leading to poor uplink performance due to non-uniform antenna placement in user equipment (UE) implementations.
Innovation Solution
The design of user equipment (UE) specific precoders based on non-uniformly sampled Fourier matrices that account for variable antenna spacing, allowing for optimal emission patterns and improved MIMO performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If uniform antenna spacing is assumed in codebook design, then the design process is simplified, but uplink performance deteriorates due to non-uniform antenna placement in practice
Solution Approach 1:
The patent changes the fundamental parameter assumption from uniform to non-uniform antenna spacing. The codebook design is adapted to accommodate variable antenna element distances, transforming the design parameters to match actual UE antenna array configurations, thereby resolving the contradiction between design simplicity and performance reliability
Solution Approach 2:
The patent introduces dynamic adaptability by making the codebook design flexible to different antenna spacing configurations. Instead of a fixed uniform spacing assumption, the system dynamically adjusts precoder selection based on the actual non-uniform antenna geometry, enabling the codebook to adapt to various UE implementations
2Reliability
If non-uniform antenna spacing is accommodated in codebook design, then uplink MIMO performance is improved, but system complexity increases
Solution Approach 1:
The patent applies local quality by customizing the codebook design for specific UE antenna configurations. Each UE with unique antenna spacing receives a tailored precoder from the codebook, optimizing performance for that local configuration rather than using a generic uniform spacing design, thus improving MIMO performance without requiring complete system redesign
Solution Approach 2:
The patent performs preliminary action by pre-calculating and storing precoders in the codebook that account for non-uniform antenna spacing. This upfront preparation eliminates the need for complex real-time calculations during transmission, as the appropriate precoder is already available in the pre-computed codebook for the specific antenna configuration
Data Source
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AI summary
Systems, methods, apparatuses, and computer program products for a UE-specific codebook design are provided. One method may include determining, by a network node, variable spacing between antenna elements of a user equipment. The method may also include configuring user equipment specific precoders based on the variable spacing between the user equipment antenna elements.