Paper Info
Title
Secure Transmission Using Linearly Distributed Virtual Antenna Array With Element Position Perturbations
Abstract
Physical-layer security (PLS) is a promising alternative or complement to cryptography-based solutions, because security key management and distribution required in such schemes are challenging in future wireless technologies with a distributed nature (e.g., Internet-of-Things (IoT) and massive machine-type communication). Motivated by this fact, in this paper, we investigate a PLS algorithm using linear virtual antenna array (VAA) constructed by multiple single-antenna nodes in mobile ad hoc networks such as unmanned aerial vehicles (UAVs) and mobile robots. Digital cooperative beamforming (CB) has been extensively explored such as cooperative null-steering or jamming. However, in spite of their effectiveness, the digital CB-based schemes incur prohibitive overhead and complexity, which creates difficulty in networks with limited hardware (e.g., IoT). To overcome this issue, we consider an analog CB-based PLS with linearly distributed VAA, which can be implemented in a fully distributed manner. In the proposed scheme, the received signal at the intended receiver is co-phased, while other receivers capture noise-like signals through randomized radiation patterns using the linear VAA. Assuming Rician channels, we derive secrecy rate of the proposed algorithm in a closed-from expression for an arbitrary K-factor, which is not available in previous work on the analog CB-based PLS. Furthermore, we show that the random location perturbations of the VAA elements following Gaussian distributions can enhance the secrecy performance by resolving the angle-of-departure ambiguity issue in linear arrays.
Year
DOI
Venue
2021
10.1109/TVT.2020.3045751
IEEE Transactions on Vehicular Technology
Keywords
DocType
Volume
Analog beamforming,linear networks,physical layer security,virtual antenna array
Journal
70
Issue
ISSN
Citations 
1
0018-9545
1
PageRank 
References 
Authors
0.35
0
3
Name
Order
Citations
PageRank
Haejoon Jung18718.11
Seung-Woo Ko242.41
In-Ho Lee310.35