Uplink MU-MIMO Beamforming with Precomputed Precoder Coefficients
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently utilizing channel state information (CSI) for multi-user multiple-input-multiple-output (MIMO) systems, particularly in uplink transmission, where precise precoder coefficients are needed for effective beamforming but are not adequately addressed in current protocols.
Innovation Solution
A method involving the transmission of multiple sets of precoder coefficients and triggers to stations (STAs) based on estimated channels, organized in frames with specific subfields and delimiters, allowing for efficient beamforming in multi-user MIMO systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If channel estimation is performed to obtain channel matrix for beamforming, then beamforming precision is improved, but system complexity and time overhead increase due to required predefined symbol transmission and CSI feedback procedures
Solution Approach 1:
The access point performs channel estimation and precoder calculation in advance before actual data transmission. The precoder coefficients are pre-computed based on estimated channels and feedback to STAs, allowing beamforming to be executed directly without repeated channel estimation during data transmission, thus reducing real-time system complexity while maintaining precision
Solution Approach 2:
The system implements a feedback mechanism where STAs send feedback information about their received signals to the access point. This feedback is used to refine channel estimates and update precoder coefficients, enabling continuous optimization of beamforming precision without requiring complete re-estimation from scratch, thereby balancing precision with complexity
2Productivity
If multiple sets of precoder coefficients are transmitted to multiple STAs simultaneously, then uplink transmission efficiency is improved, but frame structure complexity increases due to need for organized data transmission
Solution Approach 1:
The frame structure is segmented into multiple independent fields, with each field containing precoder coefficients for a specific STA. Each field is separated by delimiters and includes control information specific to that STA. This segmentation allows the access point to transmit precoder coefficients to multiple STAs simultaneously in an organized manner, improving uplink transmission efficiency while keeping each individual field manageable and structured
Solution Approach 2:
The frame structure is designed to be universal and reusable. The same frame template can be used to transmit precoder coefficients to any number of STAs by simply populating the appropriate fields. This multi-functional design allows efficient handling of multiple STAs without requiring separate transmission procedures for each STA, thus improving overall transmission efficiency while avoiding excessive complexity through standardized structure
Data Source
AI summary
A method has the steps of: transmitting to a plurality of stations (STAs) a plurality of sets of precoder coefficients and a trigger for uplink (UL) data transmission; each set of precoder coefficients are obtained based on parameters of one or more estimated channels between an access point (AP) and a respective STA of the plurality of STAs.