Kavli Affiliate: Wei Gao
| First 5 Authors: Maolin Li, Wei Gao, Qi Wu, Feng Shu, Cunhua Pan
| Summary:
As a physical layer security technology, directional modulation (DM) can be
combined with intelligent reflect-ing surface (IRS) to improve the security of
drone communications. In this paper, a directional modulation scheme assisted
by the IRS is proposed to maximize the transmission rate of unmanned aerial
vehicle (UAV) secure communication. Specifically, with the assistance of the
IRS, the UAV transmits legitimate information and main-tains its constellation
pattern at the location of legitimate users on the ground, while the
constellation pattern is disrupted at the eavesdropper’s location. In order to
solve the joint optimization problem of digital weight coefficients, UAV
position, and IRS discrete phase shift, firstly, the digital weight vector and
UAV position are optimized through power minimization. Secondly, three methods
are proposed to optimize IRS phase shift, namely vector trajectory (VT) method,
cross entropy vector trajectory (CE-VT) algorithm, and block coordinate descent
vector trajectory (BCD-VT) algorithm. Compared to traditional cross entropy
(CE) methods and block coordinate descent (BCD) methods, the proposed CE-VT and
BCD-VT algorithms can improve transmission rate performance. The numerical
results validate the effectiveness of the optimization scheme in IRS assisted
UAV communication.
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