WLAN Sounding Feedback Encoding for Lower MU-MIMO Overhead
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing wireless communication systems face challenges in managing large feedback channel information overhead, which affects the efficiency of beamforming processes in MU-MIMO environments.
Innovation Solution
A method and device for performing a sounding sequence in a wireless communication system that involves receiving a sounding null data packet, estimating channel information, converting its size to match an encoder input, encoding the information, and providing feedback, while also decoding and converting channel information for beamforming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beamforming process uses detailed channel information feedback, then communication performance is improved, but feedback overhead increases
Solution Approach 1:
The patent segments the channel information feedback into two parts: quantized channel state information (CSI) and beamforming feedback matrix. This segmentation allows selective transmission of essential information components, reducing overall feedback overhead while maintaining communication performance through the structured combination of these segments.
Solution Approach 2:
The patent extracts and transmits only the essential beamforming feedback matrix and quantized CSI components needed for beamforming operations, rather than transmitting complete channel information. This extraction approach reduces feedback overhead by eliminating redundant data while preserving the critical information required for effective beamforming.
2Measurement precision
If complete channel information is transmitted, then beamforming accuracy is improved, but feedback data size increases
Solution Approach 1:
The patent changes the parameter representation of channel information by applying quantization to the CSI and transforming it into a beamforming feedback matrix. This parameter transformation reduces the data size while maintaining beamforming accuracy through the mathematical relationship between the original channel information and the transformed feedback parameters.
Solution Approach 2:
The patent creates a compressed representation (copy) of the channel information in the form of a beamforming feedback matrix that captures the essential characteristics needed for beamforming. This copied representation maintains the necessary accuracy for beamforming operations while occupying significantly less feedback data bandwidth than the complete channel information.
3Productivity
If detailed channel feedback is provided, then MU-MIMO performance is improved, but network overhead increases
Solution Approach 1:
The patent segments the feedback information into quantized CSI and beamforming feedback matrix components, allowing efficient transmission over the network. This segmentation enables MU-MIMO operations to proceed with reduced network overhead by transmitting only the segmented essential information rather than complete channel state data.
Solution Approach 2:
The patent transforms the channel information parameters into a compressed format suitable for network transmission. By changing the parameter representation through quantization and beamforming matrix transformation, the system maintains MU-MIMO performance while significantly reducing the network overhead associated with feedback transmission.
Data Source
AI summary
A method of a station communicating with an access point in a wireless local area network (WLAN) system includes receiving a sounding null data packet (NDP) from the access point, estimating channel information based on the sounding NDP, converting a size of the channel information to match a size of an input layer of an encoder to obtain converted channel information, encoding the converted channel information based on the encoder to obtain encoded channel information, and providing feedback on the encoded channel information to the access point.