Recovering CSI and Data in Dense Network Environments using IEEE 802.11ax Midamble

There has been considerable amount of research to improve performance for a dense wireless local area network (WLAN) environment. While some studies focus on aggressive channel access, others highlight frequent channel state information (CSI) corruption by excessive transmissions. We pay attention t...

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Bibliographic Details
Published in:IEEE access 2023-01, Vol.11, p.1-1
Main Authors: Lee, Kanghyun, Shin, Juhun, Park, Jongyeon, Son, Youngwook, Bahk, Saewoong
Format: Article
Language:English
Subjects:
Algorithms
Caudal loss
Channel estimation
Channels
Corruption
CSI corruption
Design standards
HE WLAN
IEEE 802.11ax
IEEE 802.11ax Standard
Inserts
Interference
Local area networks
Midamble
Performance enhancement
Performance evaluation
Receivers
Symbols
Time-varying channels
Transmitters
Wi-Fi
Wireless fidelity
Wireless LAN
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Summary:There has been considerable amount of research to improve performance for a dense wireless local area network (WLAN) environment. While some studies focus on aggressive channel access, others highlight frequent channel state information (CSI) corruption by excessive transmissions. We pay attention to midamble, adopted in the IEEE 802.11ax standard specification, to overcome CSI corruption. If the transmitter inserts midamble symbols, the receiver can acquire new CSI periodically during a physical layer convergence protocol (PLCP) protocol data unit (PPDU) frame. In this paper, we propose a precise receiver performance model to describe the impact of CSI, and design a standard-compliant algorithm called REMEDY that works with conventional channel access schemes by handling CSI corruption and time-varying channels in high-density WLAN networks. REMEDY determines whether to use midamble considering overhead, estimates on-frame signal-to-interference and noise ratio (SINR) to notice channel environments, and cancels the effects of scrambling and incorrect descrambling. We evaluate the performance of the conventional schemes with and without REMEDY in 11ax task group (TGax) indoor simulation scenarios using the ns-3 simulator, considering time-varying channels and CSI corruption. REMEDY helps the existing channel access schemes to achieve up to 2.20× higher throughput while improving the throughput of the lowest performing group, compared to the existing schemes without REMEDY .
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2023.3290996