Channel Feedback Codebook Adaptation for Distributed MIMO
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Solution Overview
Problem
Existing channel information feedback technologies in Distributed Multiple-Input Multiple-Output (Distributed MIMO) and Cell-Free Massive Multiple-Input Multiple-Output (CF-mMIMO) systems struggle to meet the diverse and complex channel information feedback requirements due to the sparse spatial distribution of Access Points (APs) serving multiple User Equipments (UEs, particularly in environments like large gymnasiums, shopping malls, and airports.
Innovation Solution
A method involving determining a target basic vector, vector row identification bits, and constructing a codebook based on an extended vector to enhance channel information feedback, allowing for dynamic adjustment of vector row identification bits to adapt to varying channel conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional channel information feedback technologies are used in Distributed MIMO and CF-mMIMO systems, then the system can operate with sparse spatial distribution of Access Points, but the channel information feedback requirements cannot be met
Solution Approach 1:
The codebook is segmented into multiple subsets, each containing vectors with specific characteristics (e.g., different numbers of non-zero elements). This segmentation allows the system to select appropriate codebook subsets for different feedback requirements, enabling both adaptability to various channel conditions and reliability in meeting feedback requirements.
Solution Approach 2:
The patent introduces dynamic codebook selection mechanisms where the system can switch between different codebook subsets based on current channel conditions and feedback requirements. This dynamic adaptation enables the system to maintain high reliability in meeting channel information feedback requirements while operating with sparse AP distribution.
2Adaptability or versatility
If the codebook is constructed with extended vectors based on target basic vectors, then the codebook becomes more suitable for current channel information feedback requirements, but the system complexity increases
Solution Approach 1:
The patent pre-constructs multiple codebook subsets with different vector configurations before actual feedback transmission. This preliminary preparation allows the system to quickly select appropriate codebooks without complex real-time construction, reducing operational complexity while maintaining high adaptability to different channel conditions.
Solution Approach 2:
The patent changes parameters such as the number of non-zero elements in codebook vectors and the dimensions of basic vectors to create different codebook subsets. These parameter variations enable the system to adapt to different feedback requirements without fundamentally changing the codebook construction methodology, thus managing complexity while improving suitability.
3Productivity
If multiple Access Points simultaneously serve multiple User Equipments, then the system capacity increases, but the channel information feedback requirements become more complex
Solution Approach 1:
The codebook is divided into multiple subsets that can be independently selected for different AP-UE connections. This segmentation allows each connection to receive appropriate feedback information tailored to its specific channel conditions, enabling high system capacity while managing feedback complexity through targeted information transmission.
Solution Approach 2:
The patent applies different codebook characteristics to different AP-UE connections based on their specific channel conditions. Each connection receives localized feedback information with appropriate vector configurations, allowing the system to maintain high capacity while avoiding the complexity of uniform feedback for all connections.
Data Source
AI summary
The present disclosure provides a channel information feedback method, including: determining a target basic vector, the target basic vector being a basic vector which conforms to a vector configuration rule; determining vector row identification bits; determining an extended vector according to the target basic vector and the vector row identification bits; constructing a codebook according to the extended vector; and performing channel information feedback by using the codebook. The present disclosure further provides an electronic device and a computer readable medium.