Two Low-Complexity Efficient Beamformers for an IRS- and UAV-Aided Directional Modulation Network

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Two Low-Complexity Efficient Beamformers for an IRS- and UAV-Aided Directional Modulation Network

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Yeqing Lin / Feng Shu / Yuxiang Zheng / Jing Liu / Rongen Dong / Xun Chen / Yue Wu / Shihao Yan / Jiangzhou Wang

As excellent tools for aiding communication, an intelligent reflecting surface (IRS) and an unmanned aerial vehicle (UAV) can extend the coverage area, remove the blind area, and achieve a dramatic rate improvement. In this paper, we improve the secrecy rate (SR) performance of directional modulation (DM) networks using an IRS and UAV in combination. To fully explore the benefits of the IRS and UAV, two efficient methods are proposed to enhance the SR performance. The first approach computes the confidential message (CM) beamforming vector by maximizing the SR, and the signal-to-leakage-noise ratio (SLNR) method is used to optimize the IRS phase shift matrix (PSM), which is called Max-SR-SLNR. To reduce the computational complexity, the CM, artificial noise (AN) beamforming, and IRS phase shift design are independently designed in the following method. The CM beamforming vector is constructed based on the maximum ratio transmission (MRT) criteria along the channel from Alice-to-IRS, the AN beamforming vector is designed by null-space projection (NSP) on the remaining two channels, and the PSM of the IRS is directly given by the phase alignment (PA) method. This method is called the MRT-NSP-PA. The simulation results show that the SR performance of the Max-SR-SLNR method outperforms the MRT-NSP-PA method in the cases of small-scale and medium-scale IRSs, and the latter approaches the former in performance as the IRS tends to a larger scale.

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Title :

Two Low-Complexity Efficient Beamformers for an IRS- and UAV-Aided Directional Modulation Network

Contributors:

Yeqing Lin (author) / Feng Shu (author) / Yuxiang Zheng (author) / Jing Liu (author) / Rongen Dong (author) / Xun Chen (author) / Yue Wu (author) / Shihao Yan (author) / Jiangzhou Wang (author)

Published in:

Drones, Vol 7, Iss 8, p 489 (2023)

Publication date :

2023

ISSN :

2504-446X

DOI :

https://doi.org/10.3390/drones7080489

Type of media :

Article (Journal)

Type of material :

Electronic Resource