Codebook Generation Using Mask Matrix for MIMO Feedback
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Solution Overview
Problem
Existing codebooks in MIMO systems, particularly in LTE, have low accuracy when used in multi-user scenarios due to their design based on single-user MIMO, leading to inefficiencies in channel information feedback and precoding.
Innovation Solution
A method and apparatus that generate a codebook using a mask matrix and a mother codebook, where the mask matrix is derived from current antenna configuration information, allowing for improved accuracy in channel information feedback and precoding by selecting appropriate codebook elements for specific antenna configurations and transmission modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing codebooks designed for single-user MIMO are used in multi-user scenarios, then the implementation is simple, but the accuracy of channel information feedback and precoding is low
Solution Approach 1:
The codebook is segmented into multiple codebook groups, where each group corresponds to a specific antenna configuration. This segmentation allows the system to select the appropriate codebook group based on the current antenna configuration, improving the accuracy of channel information feedback without requiring a completely new codebook design for each scenario.
Solution Approach 2:
The codebook is designed to be dynamic and adaptive to different antenna configurations. The mask matrix dynamically selects and combines codebook elements based on the current antenna configuration, allowing the codebook to adapt to multi-user MIMO scenarios while maintaining a unified structure. This dynamic adaptation improves measurement precision without proportionally increasing complexity.
2Adaptability or versatility
If a unified codebook for maximum antennas is used for all configurations, then the codebook structure is simple, but the adaptability to different antenna configurations is poor
Solution Approach 1:
The codebook design achieves universality by creating a unified codebook structure that can serve multiple antenna configurations. The mask matrix mechanism allows the same codebook to be adaptively applied to different antenna configurations (2, 4, or 8 antennas) by selectively combining codebook elements, making the codebook multi-functional without requiring separate codebooks for each configuration.
Solution Approach 2:
Different portions of the codebook are optimized for different antenna configurations through the mask matrix. The mask matrix selectively activates specific codebook elements based on the current antenna configuration, ensuring that each local portion of the codebook has the appropriate quality and characteristics for its intended use case.
3Reliability
If codebook elements are selected without considering multi-user scenarios, then the feedback overhead is low, but the precoding accuracy deteriorates
Solution Approach 1:
The codebook selection process changes its parameters (which codebook elements are activated) based on the antenna configuration detected in the current subframe. The mask matrix adjusts the activation status of codebook elements according to the antenna configuration, allowing the system to maintain high precoding accuracy for the current scenario without increasing feedback overhead, as the UE still reports PMI using the same feedback mechanism.
Data Source
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AI summary
Embodiments of the present invention provide a method and an apparatus for transmitting data using a codebook. The method includes: receiving current antenna configuration information of a transmitting end; obtaining a mask matrix corresponding to the current antenna configuration according to the current antenna configuration information; generating a codebook corresponding to the current antenna configuration according to a mother codebook and the mask matrix, where the mother codebook corresponds to the maximum number of antennas and the maximum number of layers that are fed back through channel state information; selecting one codebook element from the codebook, and transmitting indication information corresponding to the codebook element to the transmitting end, where the indication information is used by the transmitting end to determine channel information of a channel to be used by the transmitting end for transmitting data; and receiving data transmitted by the transmitting end. In the embodiments of the present invention, a mask matrix is obtained according to current antenna configuration information, and a codebook is generated according to the mask matrix and a mother codebook that is corresponding to the maximum number of antennas and the maximum number of layers that are fed back through channel state information, whereby the accuracy of the codebook can be improved.