Full-Duplex Constant-Envelope Jamceiver and Self-interference Suppression by Highpass Filter: Experimental Validation for Wi-Fi Security

Jaakko Marin, Micael Bernhardt, Taneli Riihonen

Research output: Contribution to journalArticleScientificpeer-review

8 Citations (Scopus)
16 Downloads (Pure)

Abstract

Unauthorized access to data has been a recognized risk of wireless systems for many decades. While security solutions in communications engineering have typically revolved around cryptography in the higher layers, a semi-recent development is the elevating interest into security in the physical layer, namely by utilizing jamming for protection. In this paper, we present an experimental study into a full-duplex jammer–receiver (i.e., “jamceiver”) that is able to simultaneously interfere with the same radio resources it is actively receiving from. The radio architecture is loosely based on frequency-modulated continuous-wave radars that are constant-envelope radio transceivers, which benefit from simple-but-efficient self-interference suppression in the analog baseband domain by using a passive highpass filter. Its limitation to constant-envelope transmission is not an issue for efficient jamming waveforms unlike it would be with conventional direct-conversion transceivers in full-duplex communications. To show the performance limits of a practical jamceiver, we present comprehensive measurement results from a laboratory environment as well as a jamming case study from an open park area with actual Wi-Fi signals. Especially, the experiments validate the feasibility of preventing eavesdropping with continuous low-power jamming in a large area around a full-duplex jamceiver that acts as an access point for simultaneously offering decent Wi-Fi service to an off-the-shelf laptop.

Original languageEnglish
Pages (from-to)2937-2950
JournalIEEE Journal on Selected Areas in Communications
Volume41
Issue number9
DOIs
Publication statusPublished - Sept 2023
Publication typeA1 Journal article-refereed

Keywords

  • Band-pass filters
  • eavesdropping
  • Filtering theory
  • Full-duplex system
  • in-band full-duplex radio
  • Interference cancellation
  • jamming
  • Jamming
  • Physical-layer security
  • Portable computers
  • Security
  • self-interference

Publication forum classification

  • Publication forum level 2

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Electrical and Electronic Engineering

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