UL MU-MIMO Precoding With Per-STA Feedback Compression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently implementing beamforming techniques for uplink multi-user multiple-input multiple-output (UL MU-MIMO) communications due to high computational costs and interference, particularly in determining precoding coefficients for multiple stations (STAs) without imposing new requirements on existing devices.
Innovation Solution
A wireless access point (AP) transmits a first packet to trigger STAs to send sounding packets, receives and processes these packets to determine per-STA UL beamforming feedback, and provides feedback representative of unitary precoder matrices using block diagonal components and Givens rotation operations, reducing computational costs and interference by leveraging existing compression techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beamforming techniques are implemented for UL MU-MIMO communications, then communication reliability and speed are improved, but computational cost increases
Solution Approach 1:
The patent segments the precoding feedback process by providing separate per-STA beamforming feedback to each wireless station rather than joint feedback. This allows each STA to independently determine its precoding coefficients, dividing the complex computational task into manageable per-station operations that reduce overall computational burden while maintaining beamforming performance
Solution Approach 2:
The patent uses compression techniques to create compressed representations of the beamforming feedback information. By compressing the feedback data before transmission to STAs, the system reduces the amount of information that needs to be processed while preserving the essential beamforming characteristics, thereby lowering computational requirements
2Object-affected harmful factors
If per-STA beamforming feedback is provided, then interference between STAs is reduced, but feedback overhead increases
Solution Approach 1:
The patent changes the parameter representation by providing per-STA feedback in terms of compression parameters or codebook indices rather than full precoding matrices. This parameter transformation reduces the amount of feedback data while maintaining the ability to reconstruct accurate precoding information for interference mitigation
Solution Approach 2:
The patent extracts only the essential beamforming information needed for each STA individually, separating the feedback into per-STA components that can be independently processed. This extraction approach provides targeted feedback that reduces interference while minimizing overhead by including only necessary information for each station
3Adaptability or versatility
If existing STAs support enhanced beamforming without additional hardware, then device compatibility is maintained, but precoding accuracy may be limited
Solution Approach 1:
The patent enhances precoding accuracy for existing STAs by changing how feedback parameters are structured and transmitted. By providing per-STA feedback with compression parameters or codebook-based representations, the system achieves higher precision in precoding determination without requiring new hardware, as the improved parameter representation allows existing devices to compute more accurate precoding coefficients
Solution Approach 2:
The patent implements an enhanced feedback mechanism where the AP provides explicit per-STA beamforming feedback that enables STAs to determine their precoding coefficients more accurately. This feedback loop, using compression techniques and codebook-based approaches, allows existing STAs to achieve better precoding precision by utilizing the structured feedback information without hardware modifications
Data Source
AI summary
Various aspects relate generally to wireless communication and more particularly to beamforming techniques in wireless communication networks. Some aspects more specifically relate to beamforming techniques for uplink MU-MIMO communications, and the techniques can include UL MU-MIMO precoding using per-STA feedback. In some examples, an AP can support STA-side precoding for UL MU-MIMO communications by providing STAs with feedback representative of unitary matrices that correspond to block diagonal components of a matrix projection of channel matrices for the STAs in accordance with a linear equalizer. In some examples, the AP can trigger the STAs to transmit sounding packets concurrently, but can use the block diagonal matrix projection to process the various STAs' channels independently.