A Channel Frequency Response-Based Secret Key Generation Scheme in In-band Full-duplex MIMO-OFDM Systems

Haifeng Luo, Navneet Garg, Tharm Ratnarajah

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

Physical layer-based secret key generation (PHY-SKG) schemes have attracted significant attention in recent years due to their lightweight implementation and ability to achieve information-theoretical security. In this paper, we study a channel frequency response (CFR)-based SKG scheme for in-band full-duplex (IBFD)-multi-input and multi-output (MIMO) systems. We formulate the intrinsic practical imperfections and derive their effects on the probing errors. Then we derive closed-form expressions for the secret key capacity (SKC) in the presence of a passive eavesdropper accordingly. We analyze the asymptotic behavior of the SKC in the high-SNR regime and reveal the fundamental limits for IBFD and HD probing. Based on the asymptotic SKC, we investigate the conditions under which IBFD can outperform HD. Numerical results illustrate that effective analog self-interference cancellation (ASIC) depth is the basis for IBFD probing to gain benefits over HD. Finally, we analyze the properties of the collected samples of the CFR-based SKG scheme and propose an averaging pre-processing and a segmental quantization, which reduce the key disagreement rate and remove the effects of large-scale fading to guarantee randomness. 3GPP specification-based simulations and the National Institute of Standards and Technology (NIST) test suite verify the theoretical analysis and the effectiveness of the proposed SKG scheme.
Original languageEnglish
Pages (from-to)2951-2965
JournalIEEE Journal on Selected Areas in Communications
Volume41
Issue number9
Early online date21 Jun 2023
DOIs
Publication statusPublished - 1 Sept 2023

Keywords / Materials (for Non-textual outputs)

  • In-band full-duplex
  • MIMO
  • physical layer security
  • secret key generation

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