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Your search keyword '"Zvanovec, Stanislav"' showing total 482 results
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482 results on '"Zvanovec, Stanislav"'

1. 6G Wireless Technologies

Author

D’Andrea, Carmen, Jornet, Josep Miquel, Singh, Arjun, Sen, Priyangshu, Ghassemlooy, Zabih, Zvanovec, Stanislav, Teli, Shivani Rajendra, Gholami, Asghar, Loscri, Valeria, editor, Chiaraviglio, Luca, editor, and Vegni, Anna Maria, editor

Published
2024
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5. Non-Orthogonal Multi-band CAP for Highly Spectrally Efficient VLC Systems

Author

Haigh, Paul Anthony, Chvojka, Petr, Ghassemlooy, Zabih, Zvanovec, Stanislav, and Darwazeh, Izzat

Subjects
Electrical Engineering and Systems Science - Signal Processing, Computer Science - Information Theory
Abstract

In this work we propose and experimentally demonstrate a novel non-orthogonal multi-band carrier-less amplitude and phase (NM-CAP) scheme for bandlimited visible light communication systems in order to increase the spectral efficiency. We show that a bandwidth saving up to 30% can be achieved thus resulting in 44% improvement in the measured spectral efficiency with no further bit error rate performance degradation compared to the traditional m-CAP scheme. We also show that higher order systems can provide higher bandwidth compression than low order systems. Furthermore, with no additional functional blocks at the transmitter or the receiver the proposed scheme introduces no extra computational complexity., Comment: 6 pages, 5 figures

Published
2018

7. Combination of Visible Light and Radio Frequency Bands for Device-to-Device Communication

Author

Mach, Pavel, Becvar, Zdenek, Najla, Mehyar, and Zvanovec, Stanislav

Subjects
Computer Science - Information Theory
Abstract

Future mobile networks are supposed to serve high data rates required by users. To accommodate the high data rates, a direct communication between nearby mobile terminals (MTs), known as Device-to-device (D2D) communication, can be exploited. Furthermore, a communication in high frequency bands, such as, visible light communication (VLC), is also foreseen as an enabler for the high data rates. In conventional D2D communication, pairs of the MTs should reuse the same frequencies to keep a high spectral efficiency of the system. However, this implies either interference among the D2D pairs or utilization of complex and advanced resource allocation algorithms. In this paper, we propose a new concept for D2D communication combining VLC and RF technologies in order to maximize capacity of the system. This paper provides an analysis of the operational limits for the proposed concept and investigates capacity gains introduced by the combined usage of RF and VLC bands for D2D. Moreover, we discuss several practical issues related to the proposed RF-VLC D2D concept. Performed analyses show that the RF--VLC D2D is able to improve the capacity in an indoor scenario by a factor of 4.1 and 1.5 when compared to stand-alone RF D2D and VLC D2D, respectively., Comment: 7 pages, 5 figures, submitted to IEEE PIMRC

Published
2017

8. Optical Wireless Communications: Illuminating the Path for Cooper's Law

Author

Eltokhey, Mahmoud Wafik, primary, Bashir, Muhammad Salman, additional, Younus, Othman Isam, additional, Ghassemlooy, Zabih, additional, Haas, Harald, additional, Karagiannidis, George, additional, Teli, Shivani Rajendra, additional, Zvanovec, Stanislav, additional, Khalighi, Mohammad-Ali, additional, Zhang, Zhenyu Charlus, additional, Hranilovic, Steve, additional, Brandt-Pearce, Maïté, additional, Linnartz, Jean-Paul, additional, Trichili, Abderrahmen, additional, Chun, Hyunchae, additional, O'Brien, Dominic, additional, Uysal, Murat, additional, and Alouini, Mohamed-Slim, additional

Published
2024
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15. End-Capping Hollow-Core Fibers With Suppressed Coupling Into Higher-Order Modes

Author

Zhong, Ailing, Ding, Meng, Fokoua, Eric R. Numkam, Zvanovec, Stanislav, Poletti, Francesco, Komanec, Matej, and Slavik, Radan

Abstract

We propose a hollow-core fiber (HCF) end-cap that incorporates a short segment of a single-mode fiber (SMF) that serves as a modal filter. To adapt the end-cap input and output beam to the desired size, the SMF was fusion spliced with short segments of mode-field adapting graded index (GRIN) fibers on both sides. The end-cap is anti-reflective coated to minimize insertion loss and parasitic reflections. The presented proof-of-concept experiments show its ability to suppress coupling into HCFs' higher-order modes. For example, without any end-cap, the extinction ratio between the LP$_{11}$ and the fundamental mode was found to be as low as 9 dB when coupling light from a free-space beam that was misaligned by as little as 1.1$^{\circ }$. This was improved to 23 dB when inserting the developed end-cap. Such small angle misalignment often exists when aligning the input beam with 3-axis (x,y,z) stages only (rather than 5-axis that also include pitch and yaw). Finally, we glued the end-cap with the HCF, providing hermetic sealing to the HCF input/output. This is of interest for stable operation in applications that use free-space light launch or require HCF output into free space.

Published
2024
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24. Optical Camera Communications

Author

Ghassemlooy, Zabih, Luo, Pengfei, Zvanovec, Stanislav, Uysal, Murat, editor, Capsoni, Carlo, editor, Ghassemlooy, Zabih, editor, Boucouvalas, Anthony, editor, and Udvary, Eszter, editor

Published
2016
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26. Connecting Hollow-Core and Standard Single-Mode Fibers With Perfect Mode-Field Size Adaptation

Author

Zhong, Ailing, Fokoua, Eric Numkam, Ding, Meng, Dousek, Daniel, Suslov, Dmytro, Zvanovec, Stanislav, Poletti, Francesco, Slavik, Radan, and Komanec, Matej

Abstract

We propose an approach to interconnect a hollow-core fiber (HCF) of arbitrary core size with standard single-mode fiber with perfect mode-field size adaptation and experimentally achieve for the first time insertion loss agreeing with that predicted by simulations. We demonstrate this using three low-loss HCFs, including 1st window nested antiresonant nodeless fiber (NANF), 2nd window NANF and the state-of-the-art double NANF (DNANF). The connection with a minimum achieved insertion loss of 0.079 dB was permanently secured via gluing and did not degrade during 4 weeks of continuous measurement. To the best of our knowledge, this is the lowest reported value and is comparable to or lower than the connection between dissimilar single-mode fibers (e.g., standard single-mode fiber and dispersion-compensating fiber). We also show that such connection leads to excellent suppression of higher-order modes coupling, of importance to all applications sensitive to multi-path interference. Importantly, obtaining agreement between simulations and experiments validates for the first time the accuracy of the simulations and opens the door to further optimization via simulations with the ability to subsequently achieve the same result experimentally.

Published
2024
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30. A unilateral 3D indoor positioning system employing optical camera communications.

Author

Younus, Othman Isam, Chaudhary, Neha, Ghassemlooy, Zabih, Alves, Luis Nero, Zvanovec, Stanislav, Pattas, Dimitrios, and Papanikolaou, Vasilis K.

Subjects
INDOOR positioning systems, IMAGE sensors, TRANSMITTERS (Communication), OPTICAL transmitters, OPTICAL communications, STANDARD deviations, LIGHT emitting diodes, VISIBLE spectra
Abstract

This article investigates the use of a visible light positioning system in an indoor environment to provide a three dimensional (3D) high‐accuracy solution. The proposed system leveraged the use of a single light‐emitting diode and an image sensor at the transmitter and the receiver (Rx) respectively. The proposed system can retrieve the 3D coordinate of the Rx using a combination of the angle of arrival and received signal strength (RSS). To mitigate the error induced by the lens at the Rx, a novel method is proposed and experimentally tested. The authors show that, the proposed method outperforms previously reported RSS under all circumstances and it is immune to varying exposure times within the standard range of 250 µs to 4 ms. The authors experimentally demonstrate that the proposed algorithm can achieve a 3D root mean squared error of 7.56 cm. [ABSTRACT FROM AUTHOR]

Published
2023
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