TY - GEN
T1 - Near-Field Beamforming for IRS-Assisted Secure Wireless Powered Communication Network
AU - Han, Shuai
AU - Xu, Jiahang
AU - Wu, Chenyu
AU - He, Chenguang
AU - Meng, Weixiao
N1 - Publisher Copyright:
© 2025 IEEE.
PY - 2025
Y1 - 2025
N2 - Since intelligent reflecting surface (IRS) typically consists of a large number of elements, near-field propagation becomes dominant in wireless communications. In this paper, we investigate the design for a secure IRS-aided near-field wireless powered communication network (WPCN). We aim to maximize the secrecy rate by jointly optimizing the energy precoding matrix at a power station (PS), the IRS coefficient matrix, and the transmission allocation time factor. To handle the optimization problem, we propose an effective iterative algorithm where the energy precoding matrix and the IRS coefficient matrix are obtained in closed and semi-closed forms, respectively. Numerical results reveal that compared with the far-field beamforming scheme, the proposed near-field beamforming significantly improves the secrecy rate. Moreover, results also show the necessity of properly allocating the transmission time of different phases in WPCN.
AB - Since intelligent reflecting surface (IRS) typically consists of a large number of elements, near-field propagation becomes dominant in wireless communications. In this paper, we investigate the design for a secure IRS-aided near-field wireless powered communication network (WPCN). We aim to maximize the secrecy rate by jointly optimizing the energy precoding matrix at a power station (PS), the IRS coefficient matrix, and the transmission allocation time factor. To handle the optimization problem, we propose an effective iterative algorithm where the energy precoding matrix and the IRS coefficient matrix are obtained in closed and semi-closed forms, respectively. Numerical results reveal that compared with the far-field beamforming scheme, the proposed near-field beamforming significantly improves the secrecy rate. Moreover, results also show the necessity of properly allocating the transmission time of different phases in WPCN.
KW - Intelligent reflecting surface
KW - near-field communication
KW - secrecy throughput
KW - wireless powered communication network
UR - https://www.scopus.com/pages/publications/105032412773
U2 - 10.1109/VTC2025-Fall65116.2025.11310165
DO - 10.1109/VTC2025-Fall65116.2025.11310165
M3 - 会议稿件
AN - SCOPUS:105032412773
T3 - IEEE Vehicular Technology Conference
BT - 2025 IEEE 102nd Vehicular Technology Conference, VTC 2025-Fall - Proceedings
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2025 IEEE 102nd Vehicular Technology Conference, VTC 2025
Y2 - 19 October 2025 through 22 October 2025
ER -