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Robust Beamfocusing for Secure NFC with Imperfect CSI.

Weijian Chen1, Zhiqiang Wei1, Zai Yang1

  • 1School of Mathematics and Statistics, Xi'an Jiaotong University, Xi'an 710049, China.

Sensors (Basel, Switzerland)
|February 26, 2025
PubMed
Summary
This summary is machine-generated.

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This study enhances physical layer security in near-field communication (NFC) systems by designing beamforming and artificial noise strategies to protect against eavesdroppers, even with imperfect channel information.

Area of Science:

  • Wireless communication
  • Information security
  • Signal processing

Background:

  • Near-field communication (NFC) systems with massive MIMO arrays create security challenges due to eavesdroppers near the transmitter.
  • Accurate near-field channel models are crucial for understanding and mitigating these security risks.
  • Imperfect channel state information (CSI) complicates the design of secure communication protocols.

Purpose of the Study:

  • To investigate physical layer security (PLS) in NFC systems with eavesdroppers.
  • To propose and evaluate two novel schemes for enhancing PLS under imperfect CSI.
  • To develop robust beamforming and artificial noise (AN) strategies to minimize eavesdropping.

Main Methods:

  • Considered two PLS schemes: one with a multiple-input multiple-output multiple-antenna eavesdropper (MIMOME) and AN from the transmitter, and another with a full-duplex (FD) receiver emitting AN.
Keywords:
artificial noise (AN)beamformingmultiple-input multiple-output multiple-antenna eavesdropper (MIMOME)near-field communication (NFC)physical layer security (PLS)

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  • Jointly designed beamforming and AN vectors to degrade the eavesdropper's signal-to-interference-plus-noise ratio (SINR).
  • Proposed an iterative algorithm for power minimization with quality-of-service (QoS) constraints, decomposing the robust optimization problem into solvable sub-problems using generalized Rayleigh quotient and semi-definite programming (SDP).

    • Main Results:

    • The proposed iterative algorithm effectively minimizes power consumption while meeting QoS requirements.
    • The joint design of beamforming and AN vectors significantly degrades the eavesdropper's reception quality.
    • Simulation results validate the effectiveness of the developed protection zone strategies in NFC systems with imperfect CSI.

    Conclusions:

    • The proposed methods provide a viable approach to enhance physical layer security in near-field communication systems.
    • The study demonstrates the effectiveness of artificial noise and optimized beamforming in creating secure communication zones.
    • The findings are crucial for securing future NFC applications operating under realistic channel conditions.