4.7 Article

Adaptive Preamble Embedding With MIMO to Support User-Defined Functionalities in WLANs

期刊

IEEE TRANSACTIONS ON MOBILE COMPUTING
卷 22, 期 2, 页码 691-707

出版社

IEEE COMPUTER SOC
DOI: 10.1109/TMC.2021.3095459

关键词

MIMO communication; Wireless fidelity; Security; Image color analysis; Protocols; Mobile computing; Training; Preamble embedding; OFDM; MIMO; IEEE 802.~11ax; USRP experiments

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As Wi-Fi technology evolves into its sixth generation (Wi-Fi 6), there is a consensus on the need for security and coordination functions at the Physical (PHY) layer. We propose a scheme called extensible preamble modulation (eP-Mod) that allows embedding user bits into the 802.11ac preamble of MIMO and OFDM-based protocols. The scheme provides adaptive channel conditions and enables various PHY-layer services, while remaining compatible with legacy devices.
As the Wi-Fi technology transitions into its sixth generation (Wi-Fi 6), there is a growing consensus on the need to support security and coordination functions at the Physical (PHY) layer. In contrast to the costly approach of extending the PHY-layer header to support new functions (e.g., Spatial Reuse field in the Wi-Fi 6 frame), we propose to turn specific parts of the frame preamble into a reliable data field while maintaining its primary functions. Specifically, in this paper, we develop a scheme called extensible preamble modulation (eP-Mod) for 802.11n/ac/ax protocols that are built on multiple-input-multiple-output (MIMO) and orthogonal frequency division multiplexing (OFDM). For each frame, eP-Mod can embed up to 144 user bits into the 802.11ac preamble of an 8 x 8 MIMO 40 MHz transmission. The proposed scheme is adaptive to channel conditions and enables several promising PHY-layer services, such as PHY-layer encryption and channel/device authentication, and PHY-layer signaling. At the same time, it allows legacy (eP-Mod-unaware) devices to continue to process the received preamble as normal by guaranteeing that the proposed preamble waveforms satisfy the structural properties of a standardized preamble. Through numerical analysis, extensive simulations, and hardware experiments, we validate the practicality and reliability of eP-Mod.

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