Wireless Feedback Codebook for Multi-Antenna Systems
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting feedback using codebooks in multi-dimensional antenna environments, particularly in reducing feedback overhead while maintaining effective beamforming gains.
Innovation Solution
The method involves determining and feeding back codewords for multiple horizontal antenna groups, including a first and second codeword from a prestored codebook, and a third codeword based on phase increment values, to support multi-dimensional antennas and cross-pole configurations, allowing for efficient MIMO transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If feedback information for all antenna groups is transmitted separately, then beamforming gain is maintained, but feedback overhead increases
Solution Approach 1:
The patent combines feedback information from multiple antenna groups into a single unified feedback message. Instead of transmitting separate feedback for each antenna group, the system merges the feedback into one consolidated transmission, reducing the total feedback overhead while preserving the beamforming gain through unified precoding matrix indication.
Solution Approach 2:
The feedback mechanism is designed to serve multiple antenna groups simultaneously through a universal feedback structure. A single feedback message contains information that applies to multiple antenna groups, making the feedback system multi-functional and efficient in handling diverse antenna configurations.
2Reliability
If codebook size is increased to support multi-dimensional antennas, then beamforming performance improves, but feedback overhead increases
Solution Approach 1:
The codebook is segmented into multiple sub-codebooks, each corresponding to different antenna groups or dimensions. This segmentation allows the system to support multi-dimensional antennas with enhanced beamforming performance while managing feedback overhead by selecting from specialized sub-codebooks rather than transmitting feedback for a single large codebook.
Solution Approach 2:
The patent introduces an additional dimension to the codebook structure by organizing codebooks across multiple antenna groups and dimensions. This multi-dimensional codebook organization enables support for complex antenna configurations without proportionally increasing feedback overhead, as the system can exploit the dimensional structure to efficiently indicate precoding matrices.
3Measurement precision
If separate feedback is used for each antenna group, then accuracy is maintained, but system complexity increases
Solution Approach 1:
The patent merges feedback processing for multiple antenna groups into a unified system-level operation. By combining feedback information and processing it centrally, the system maintains the accuracy needed for precise beamforming while reducing the complexity of individual antenna group processing and inter-group coordination.
Data Source
AI summary
The present invention relates to a method for a transmission end transmitting a feedback by using a codebook in a wireless communication system, which supports a multiple antennas, comprising the steps of: determining a first codeword for a first horizontal antenna group from a first codebook, which comprises at least one precoding matrix and is selected for a plurality of horizontal antenna groups from a predetermined codebook; determining a second codeword for a second horizontal antenna group; determining a third codeword for each of the antenna groups other than the first and second horizontal antenna groups, from the plurality of horizontal antenna groups; and providing a feedback of at least one of first, second and third codewords to a receiving end, wherein the third codeword is determined according to a phase increase value, which is determined in accordance with the first and second codewords.