Secure Beamforming for MISO Visible Light Communications With ISI and NLoS Components

For simplicity, most works on visible light communications (VLC) neglect the non-line-of-sight (NLoS) channel gain and the inter-symbol interference (ISI). This letter investigates the optimal and robust secure beamforming problems for multiple-input single-output VLC systems, where both the NLoS ch...

Full description

Saved in:
Bibliographic Details
Published inIEEE wireless communications letters Vol. 13; no. 3; pp. 908 - 912
Main Authors Wang, Jin-Yuan, Yu, Yin-Chang, Lu, Ding-Shan, Su, Dao-Peng
Format Journal Article
LanguageEnglish
Published Piscataway IEEE 01.03.2024
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Array signal processing
Beamforming
Inter-symbol interference
Iterative algorithms
Iterative methods
Light emitting diodes
Line of sight communication
MISO (control systems)
MISO communication
non-line-of-sight
Nonlinear optics
Optimization
Robustness (mathematics)
secure beamforming
Symbols
Visible light communication
Online AccessGet full text

Cover

More Information
Summary:For simplicity, most works on visible light communications (VLC) neglect the non-line-of-sight (NLoS) channel gain and the inter-symbol interference (ISI). This letter investigates the optimal and robust secure beamforming problems for multiple-input single-output VLC systems, where both the NLoS channel gain and ISI are considered. Under perfect channel state information (CSI), we formulate an optimal beamforming problem to maximize the secrecy rate under amplitude constraints on beamformers. The problem is shown to be nonconvex. We transform it into multiple tractable quasiconvex subproblems, and propose an iterative algorithm to solve it. To be more practical, we then consider the imperfect CSI and design the robust secure beamformers. Numerical results verify the efficiency of the proposed beamforming schemes. Moreover, it is also shown that the NLoS channel gain can improve the secrecy rate and well-designed beamformers can reverse the effect of ISI.
ISSN:2162-2337
2162-2345
DOI:10.1109/LWC.2024.3350544