On the Use of Near-Field Constellation Focusing for Physical Layer Security with Extremely Large Antenna Arrays

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Abstract

In the fast-changing world of wireless communications, the combination of extremely large antenna arrays (ELAAs) and energy-efficient transmission methods is envisioned for the 6G. The application of directivity in the transmitted constellation can increase physical layer security (PLS) and promote the energy efficiency of transmission. In such scenarios, large constellations can be divided into multiple binary phase shift keying (BPSK) components, with each component being individually amplified and transmitted by an antenna. In this work, we consider an ELAA acting as a transmitter and constellation decomposition at the sub-array level. We investigate the impact of considering a near-field channel model in terms of secrecy rate and mutual information. In addition to the energy efficiency of the constellation decomposition, it is demonstrated that the particularities of near-field beamforming increase the PLS, namely in terms of robustness to eavesdropping.
Original languageEnglish
Article number869
Number of pages13
JournalElectronics (Switzerland)
Volume13
Issue number5
DOIs
Publication statusPublished - 23 Feb 2024

Keywords

  • directivity
  • near field
  • optimized constellations
  • physical layer security

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