Flexible Cylindrical Array-Aided Secure Wireless Communications

doi:10.1109/lwc.2026.3723844

Flexible Cylindrical Array-Aided Secure Wireless Communications

2026-08-14

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DOI：10.1109/lwc.2026.3723844

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In this letter, we investigate a multiuser multiple-input single-output (MU-MISO) downlink secure communication system aided by a flexible cylindrical array (FCLA) and artificial noise (AN), where each antenna element rotates along circular tracks while the circular slices move along a vertical axis. To guarantee transmission security, we aim to maximize the achievable sum rate at multiple legitimate information receivers by jointly optimizing transmit beamforming, AN covariance matrix, and antenna placement under secrecy constraints for an eavesdropper. While the resulting problem is intractable to solve, we develop a block coordinate descent (BCD)-based framework that combines the Lagrangian dual transform, tight semidefinite relaxation (SDR), and Nesterov-accelerated projected gradient descent (PGD). Numerical results show that the proposed algorithm converges rapidly and achieves significant sum rate gains over benchmark schemes by exploiting the geometry flexibility of the array.

Keywords:

Flexible cylindrical array

physical layer security

antenna position optimization

artificial noise

Flexible Cylindrical Array-Aided Secure Wireless Communications

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