Title | ||
---|---|---|
Secure Directional Modulation in RIS-Aided Networks: A Low-Sidelobe Hybrid Beamforming Approach |
Abstract | ||
---|---|---|
This letter considers the incorporation of secure directional modulation in reconfigurable intelligent surface (RIS)-aided communication networks. With elaborately selected antenna subsets, secure directional modulation generates randomized signals at undesired directions to assure physical-layer security. One major challenge of introducing RIS is that an additional beam, other than the user-specific beam, is required to align to the RIS. The interplay between the two beams can cause high sidelobe, which is non-trivial to address due to the discrete optimization in antenna subset selection. To tackle this challenge, we propose a novel cross-entropy iterative method to achieve low-sidelobe hybrid beamforming for secure directional modulation in RIS-aided networks. We use maximum sidelobe energy as the objective function to reduce the emission, and deploy Kullback-Leibler divergence as the criterion in the iterative selection of good candidate antenna subsets. Simulation results illustrate that the proposed scheme can reduce the sidelobe energy by 8 dB, and the symbol error rate of the eavesdropper maintains at 0.75 (0.875) for QPSK (8PSK) even when its signal-to-noise ratio increases. |
Year | DOI | Venue |
---|---|---|
2022 | 10.1109/LWC.2022.3180931 | IEEE Wireless Communications Letters |
Keywords | DocType | Volume |
Secure directional modulation,reconfigurable intelligent surface,low-sidelobe,physical-layer security,cross entropy | Journal | 11 |
Issue | ISSN | Citations |
8 | 2162-2337 | 0 |
PageRank | References | Authors |
0.34 | 8 | 5 |
Name | Order | Citations | PageRank |
---|---|---|---|
Neng Ye | 1 | 40 | 9.33 |
Xinran Zhuo | 2 | 0 | 0.34 |
Jianguo Li | 3 | 377 | 35.38 |
Boya Di | 4 | 518 | 44.66 |
An Jian-ping | 5 | 135 | 28.23 |