Codebook Construction for MIMO Precoding via Antenna Grouping
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Solution Overview
Problem
Existing codebook construction methods for precoding in wireless communication systems face challenges with flexibility and scalability as the number of transmit antennas or base stations increases, leading to reduced performance and complexity.
Innovation Solution
A method for constructing a codebook that involves receiving grouping information on transmit antennas, obtaining a channel model, and determining optimal precoding matrices for each antenna group to create a codebook suitable for precoding, allowing for the selection and concatenation of precoding matrices to improve data transmission quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If structured codebook construction methods are used, then construction complexity is reduced and scalability is improved, but flexibility deteriorates as the number of transmit antennas increases
Solution Approach 1:
The patent divides the codebook construction into multiple stages: first constructing a base codebook for a reference antenna configuration, then generating codebooks for other configurations through matrix transformations. This segmentation allows complex codebook construction to be broken down into manageable steps, reducing overall construction complexity while maintaining flexibility through the transformation parameters.
Solution Approach 2:
The patent introduces dynamic transformation parameters (rotation angles, scaling factors) that allow the codebook structure to adapt to different antenna configurations. By making the codebook generation process dynamic rather than static, the system maintains flexibility across varying numbers of transmit antennas while following a structured construction methodology.
2Productivity
If the number of transmit antennas is increased, then system capacity and throughput are improved, but codebook construction flexibility deteriorates
Solution Approach 1:
The patent creates a universal codebook construction framework that can serve multiple antenna configurations through matrix transformations. A single base codebook can be transformed to serve different numbers of transmit antennas, making the codebook system multi-functional and adaptable to various system capacities without requiring completely separate codebooks for each configuration.
Solution Approach 2:
The patent utilizes parameter changes (transformation matrices, rotation angles, scaling factors) to adapt the codebook to different antenna configurations. By changing these parameters rather than the fundamental codebook structure, the system can scale to support increased numbers of transmit antennas while maintaining codebook flexibility and avoiding complete reconstruction.
3Ease of manufacture
If conventional codebook construction is used, then implementation is simpler, but performance deteriorates in multi-BS MIMO systems with large numbers of antennas
Solution Approach 1:
The patent performs preliminary construction of a base codebook that incorporates transformation capabilities. By preparing the codebook structure in advance with built-in transformation matrices and parameters, the system achieves both ease of implementation (through the pre-prepared structure) and improved performance (through the ability to adapt to specific antenna configurations) in multi-BS MIMO systems.
Data Source
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AI summary
The present invention discloses a method and apparatus for constructing a codebook. The method comprises: receiving grouping information on a plurality of transmit antennas of a base station; obtaining a channel model for a channel between a mobile terminal and the base station; and determining an optimal precoding matrix corresponding to each antenna group according to the grouping information and the channel model, so as to construct a codebook used for precoding. The present invention further discloses a method and apparatus for selecting a precoding matrix, as well as a method, apparatus and system for precoding.