Revisiting Multi-User Downlink in IEEE 80211ax: A Designers Guide to MU-MIMO
<|reference_start|>Revisiting Multi-User Downlink in IEEE 80211ax: A Designers Guide to MU-MIMO: Downlink (DL) Multi-User (MU) Multiple Input Multiple Output (MU-MIMO) is a key technology that allows multiple concurrent data transmissions from an Access Point (AP) to a selected sub-set of clients for higher network efficiency in IEEE 802.11ax. However, DL MU-MIMO feature is typically turned off as the default setting in AP vendors' products, that is, turning on the DL MU-MIMO may not help increase the network efficiency, which is counter-intuitive. In this article, we provide a sufficiently deep understanding of the interplay between the various underlying factors, i.e., CSI overhead and spatial correlation, which result in negative results when turning on the DL MU-MIMO. Furthermore, we provide a fundamental guideline as a function of operational scenarios to address the fundamental question "when the DL MU-MIMO should be turned on/off".<|reference_end|>
@article{cao2024revisiting,
    title={Revisiting Multi-User Downlink in IEEE 802.11ax: A Designers Guide to
  MU-MIMO},
    author={Liu Cao, Lyutianyang Zhang, Sumit Roy, Sian Jin},
    journal={arXiv preprint arXiv:2406.05913},
    year={2024},
    archivePrefix={arXiv},
    eprint={2406.05913},
    primaryClass={cs.NI eess.SP}
}