Page 13 - ITU Journal Future and evolving technologies – Volume 2 (2021), Issue 2

ITU Journal on Future and Evolving Technologies, Volume 2 (2021), Issue 2

Doors in the sky: Detection, localization and classification of aerial
vehicles using laser mesh

Pages 139-156
Wahab Khawaja, Ender Ozturk, Ismail Guvenc

Stealth technology and Unmanned Aerial Vehicles (UAVs) are expected to dominate current and future
aerial warfare. The radar systems at their maximum operating ranges, however, are not always able to
detect stealth and small UAVs mainly due to their small radar cross sections and/or low altitudes. In
this paper, a novel technique as an alternative to radar technology is proposed. The proposed approach
is based on creating a mesh structure of laser beams initiated from aerial platforms towards the ground.
The laser mesh acts as a virtual net in the sky. Any aerial vehicle disrupting the path of the laser beams
are detected and subsequently localized and tracked. As an additional feature, steering of the beams can
be used for increased coverage and improved localization and classification performance. A database
of different types of aerial vehicles is created artificially based on Gaussian distributions. The database
is used to develop several Machine Learning (ML) models using different algorithms to classify a target.
Overall, we demonstrated through simulations that our proposed model achieves simultaneous detection,
classification, localization, and tracking of a target.
View Article

Equal-gain combining with interference mitigation for molecular type
hopping assisted molecular shift keying systems

Pages 157-164
Weidong Gao, Terrence Mak, Lie-Liang Yang

In multiple access molecular diffusive communications, many nano-machines exchange information
and fuse data through a common Diffusive Molecular Communication (DMC) channel. Hence, there is
Multiple-Access Interference (MAI), which should be sufficiently mitigated so as to achieve reliable
communications. In this paper, we propose a novel low-complexity detection scheme, namely Equal-
Gain Combining with Interference Mitigation (EGC-IM), for signal detection in the Molecular Type
Hopping assisted Molecular Shift Keying (MTH-MoSK) DMC systems. By removing a number of
entries from each row of the detection matrix formed during detection, the EGC-IM scheme shows its
potential to significantly mitigate MAI and hence, outperform the conventional EGC scheme.
Furthermore, the EGC-IM scheme has lower complexity than the conventional EGC scheme and
therefore, it is beneficial for practical implementation.
View Article

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