CSI Precoding Matrix Codebook Design for Large Antenna Arrays
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Solution Overview
Problem
Existing CSI frameworks face difficulties in accommodating larger antenna arrays, leading to increased CSI complexity and overhead.
Innovation Solution
The proposed solution involves an enhanced CSI framework that supports a two-stage precoding matrix codebook design, reducing dimensionality through port subset selection and employing a dual mode codebook design that extends legacy codebooks to support larger numbers of CSI-RS ports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing CSI frameworks are used with larger antenna arrays, then the system can support more antenna ports, but CSI complexity and overhead increase
Solution Approach 1:
The patent segments the CSI feedback process into two stages: wideband PMI selection based on a reduced codebook, and subband CQI refinement. This segmentation allows the system to handle large antenna arrays by breaking down the complex CSI computation into manageable parts, reducing overall complexity while maintaining adaptability to larger antenna configurations
Solution Approach 2:
The patent transforms the CSI codebook from traditional dimensional representations to a two-dimensional structure that separately handles spatial and frequency dimensions. This dimensional transformation enables more efficient representation of channel states for large antenna arrays, reducing the overhead required to describe the channel state information
2Adaptability or versatility
If traditional codebooks are extended to support more CSI-RS ports, then compatibility with existing frameworks is maintained, but computational complexity increases
Solution Approach 1:
The codebook is segmented into wideband and subband components, where the wideband codebook handles the majority of the port coverage with reduced complexity, and the subband codebook provides fine-grained adjustments. This segmentation allows extension to more CSI-RS ports without proportionally increasing computational complexity
Solution Approach 2:
The patent extracts the essential channel characteristics into a compact wideband representation, separating the dominant spatial features from the finer frequency-dependent variations. This extraction allows the system to support more ports by only transmitting the most significant channel parameters, reducing computational burden
Data Source
AI summary
Various aspects of the present disclosure relate to channel state information (CSI) with indication of precoding matrix. An apparatus (e.g., user equipment (UE)) generates a CSI report including an indication of a precoding matrix, the precoding matrix corresponding to at least one codebook mode. The at least one codebook mode is based at least in part on a codebook type including a set of consecutive transformations including a first transformation including a reduction of dimensions of a plurality of CSI reference signal (RS) (CSI-RS) ports to a first transform domain, and a second transformation including a first linear transformation of the first transform domain to a second transform domain. The apparatus transmits the CSI report to a network entity.