Study of CSI Compression Influence on MU-MIMO Efficiency under Channel Aging

Multi-User Multiple Input Multiple Output (MU-MIMO) technology allows you to increase the channel throughput. However, its efficiency is reduced by overhead induced by frequent channel sounding and transmission of channel feedback frames. This article examines the problems of channel state information (CSI) compression in Wi-Fi networks using MU-MIMO with channel aging. The research aims to experimentally test the effectiveness of MU-MIMO technology in real use cases, considering the channel sounding procedures and CSI feedback transmission. Using an experimental setup, the channel has been recorded to analyze its behavior and the evolution of the signal received power under different conditions. In addition, the limits of the applicability of the TGax MU-MIMO channel model in the WLAN Toolbox have been investigated by comparing it with experimental results. The findings of this study are particularly useful in optimizing MU-MIMO performance under channel time evolution and CSI compression.