Hybrid MIMO Precoder Codebook for Phase Offset Adaptation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication technologies, particularly in 5G NR, face challenges in optimizing data transmission performance due to phase offsets or errors, which affect spectral efficiency, especially with advanced UEs having multiple antennas.
Innovation Solution
Implementing a hybrid codebook that combines discrete Fourier transform (DFT) and non-DFT precoders, allowing selection based on phase offset or error conditions to optimize precoding for improved performance and spectral efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single codebook type (DFT or non-DFT) is used for precoding, then the codebook structure is simple, but the system cannot adapt to phase offset errors and achieves lower spectral efficiency
Solution Approach 1:
The patent merges DFT precoders and non-DFT precoders into a single hybrid codebook structure. The codebook includes both DFT-based precoders (for cases without phase offset errors) and non-DFT-based precoders (for cases with phase offset errors), allowing the system to adapt to different channel conditions by selecting from this combined set of precoders.
Solution Approach 2:
The patent introduces dynamic selection capability where the system can switch between DFT and non-DFT precoders based on detected phase offset conditions. The codebook is configured to support dynamic switching between different precoder types, enabling adaptive response to changing channel conditions rather than being fixed to a single precoder type.
2Reliability
If DFT precoders are used, then the codebook is simple and computationally efficient, but performance deteriorates when phase offset errors are present
Solution Approach 1:
The patent changes the parameter of codebook composition by incorporating both DFT and non-DFT precoders. This parameter change enables the system to maintain reliability across different phase offset conditions. The system can detect phase offset conditions and select the appropriate precoder type, thereby maintaining data transmission performance without being limited to a single precoder approach.
3Productivity
If non-DFT precoders are added to the codebook to handle phase offset errors, then spectral efficiency improves under error conditions, but the codebook size and complexity increase
Solution Approach 1:
The patent segments the codebook into distinct portions: a first set of DFT precoders and a second set of non-DFT precoders. This segmentation allows the system to organize and manage the increased codebook size in a structured manner, with each segment serving specific functions based on channel conditions. The segmented structure facilitates efficient precoder selection while managing the complexity of the enlarged codebook.
Data Source
AI summary
A user equipment (UE) precodes data for transmission by the wireless device based on a hybrid codebook comprising a first set of one or more discrete Fourier transform (DFT) precoders and a second set of one or more non-DFT precoders. The UE also transmits a signal based on the precoded data.