Abstract
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\times 8$8×8 MIMO $40\;$40MHz 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.
Original language | English (US) |
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Pages (from-to) | 691-707 |
Number of pages | 17 |
Journal | IEEE Transactions on Mobile Computing |
Volume | 22 |
Issue number | 2 |
DOIs | |
State | Published - Feb 1 2023 |
Keywords
- IEEE 802.11ax
- MIMO
- OFDM
- Preamble embedding
- USRP experiments
ASJC Scopus subject areas
- Software
- Computer Networks and Communications
- Electrical and Electronic Engineering