Revisiting Multi-User Downlink in IEEE 802.11ax: A Designers Guide to MU-MIMO
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arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866929463665623040 |
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| author | Cao, Liu Zhang, Lyutianyang Roy, Sumit Jin, Sian |
| author_facet | Cao, Liu Zhang, Lyutianyang Roy, Sumit Jin, Sian |
| contents | 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". |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_05913 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Revisiting Multi-User Downlink in IEEE 802.11ax: A Designers Guide to MU-MIMO Cao, Liu Zhang, Lyutianyang Roy, Sumit Jin, Sian Networking and Internet Architecture Signal Processing 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". |
| title | Revisiting Multi-User Downlink in IEEE 802.11ax: A Designers Guide to MU-MIMO |
| topic | Networking and Internet Architecture Signal Processing |
| url | https://arxiv.org/abs/2406.05913 |