eprintid: 10187538 rev_number: 6 eprint_status: archive userid: 699 dir: disk0/10/18/75/38 datestamp: 2024-02-22 10:48:46 lastmod: 2024-02-22 10:48:46 status_changed: 2024-02-22 10:48:46 type: article metadata_visibility: show sword_depositor: 699 creators_name: Xiao, H creators_name: Hu, X creators_name: Li, A creators_name: Wang, W creators_name: Su, Z creators_name: Wong, KK creators_name: Yang, K title: STAR-RIS Enhanced Joint Physical Layer Security and Covert Communications for Multi-antenna mmWave Systems ispublished: inpress divisions: UCL divisions: B04 divisions: C05 divisions: F46 note: This version is the author accepted manuscript. For information on re-use, please refer to the publisher's terms and conditions. abstract: This paper investigates the utilization of simultaneously transmitting and reflecting RIS (STAR-RIS) in supporting joint physical layer security (PLS) and covert communications (CCs) in a multi-antenna millimeter wave (mmWave) system, where the base station (BS) communicates with both covert and security users while defeating eavesdropping by wardens with the help of a STAR-RIS. Specifically, analytical derivations are performed to obtain the closed-form expression of warden’s minimum detection error probability (DEP). Furthermore, the asymptotic result of the minimum DEP and the lower bound of the secure rates are derived, considering the practical assumption that BS only knows the statistical channel state information (CSI) between STAR-RIS and the wardens. Subsequently, an optimization problem is formulated with the aim of maximizing the average sum of the covert rate and the minimum secure rate while ensuring the covert requirement and quality of service (QoS) for legal users by jointly optimizing the active and passive beamformers. Due to the strong coupling among variables, an iterative algorithm based on the alternating strategy and the semi-definite relaxation (SDR) method is proposed to solve the non-convex optimization problem. Simulation results indicate that the performance of the proposed STAR-RIS-assisted scheme greatly surpasses that of the conventional RIS scheme, which validates the superiority of STAR-RIS in simultaneously implementing PLS and CCs. date: 2024-01-30 date_type: published publisher: Institute of Electrical and Electronics Engineers (IEEE) official_url: http://dx.doi.org/10.1109/twc.2024.3354452 oa_status: green full_text_type: other language: eng primo: open primo_central: open_green verified: verified_manual elements_id: 2247653 doi: 10.1109/TWC.2024.3354452 lyricists_name: Wong, Kai-Kit lyricists_id: KWONG98 actors_name: Flynn, Bernadette actors_id: BFFLY94 actors_role: owner full_text_status: public publication: IEEE Transactions on Wireless Communications citation: Xiao, H; Hu, X; Li, A; Wang, W; Su, Z; Wong, KK; Yang, K; (2024) STAR-RIS Enhanced Joint Physical Layer Security and Covert Communications for Multi-antenna mmWave Systems. IEEE Transactions on Wireless Communications 10.1109/TWC.2024.3354452 <https://doi.org/10.1109/TWC.2024.3354452>. (In press). Green open access document_url: https://discovery.ucl.ac.uk/id/eprint/10187538/1/STAR-RIS_Enhanced_Joint_Physical_Layer_Security_and_Covert_Communications_for_Multi-antenna_mmWave_Systems.pdf