Stanislav Zvanovec

Stanislav Zvanovec
Czech Technical University in Prague | ČVUT · Faculty of Electrical Engineering (FEL)

prof. Ing., Ph.D.

About

383
Publications
72,385
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
3,376
Citations
Citations since 2017
250 Research Items
2962 Citations
20172018201920202021202220230100200300400500600
20172018201920202021202220230100200300400500600
20172018201920202021202220230100200300400500600
20172018201920202021202220230100200300400500600
Additional affiliations
January 2015 - present
Czech Technical University in Prague
Position
  • vice head of department

Publications

Publications (383)
Conference Paper
Full-text available
Optical wireless technology uses light for mobile communications. The idea is to simultaneously combine the illumination provided by modern high-power light-emitting diodes (LEDs) with high-speed wireless communications. There have been numerous practical demonstrations of this concept, and the technology is now well matured to be deployed in pract...
Article
Full-text available
Visible light communications (VLC) is a technology with enormous potential for a wide range of applications within next generation transmission and broadcasting technologies. VLC offers simultaneous illumination and data communications by intensity modulating the optical power emitted by light-emitting diodes (LEDs) operating in the visible range o...
Article
Visible light communications (VLC) is a new emerging technology, which provides both data transmission and illumination by utilizing the visible range (370 – 780 nm) of the electromagnetic spectrum. In order to maximize the available data rate and enhance the user’s mobility within an indoor environment, it is essential to characterize the communic...
Article
Full-text available
This paper presents original measurement results from an all-optical 10 Gbit/s free-space optics (FSO) relay link involving two FSO links and an all-optical switch. Considering the fact that reported analysis of relay links are dominated by analytical findings, this experimental results represent a vital resource for evaluating the performance of r...
Article
Full-text available
Free-Space Optical (FSO) communications link performance is highly affected when propagating through the time-spatially variable turbulent environment. In order to improve signal reception, several mitigation techniques have been proposed and analytically investigated. This paper presents experimental results for the route diversity technique evalu...
Poster
Full-text available
Microwave photonics presents an advanced technology of optical devices and techniques for signal processing and transport of radio frequency (RF) signals for 5G and beyond networks. Optical fibers and optical wireless communication (OWC) links, used in microwave photonic systems as transmission mediums, have already shown their vast possibilities a...
Article
Full-text available
Symmetries in system modeling can be exploited to obtain analytical results on the system behavior and to speed up computations using the symmetric model. This work explores the use of symmetries in radiant surfaces for calculating the induced irradiance distributions by developing a general mathematical expression. The obtained model is applied to...
Article
Full-text available
We report simultaneous low coupling loss (below 0.2 dB at 1550 nm) and low back-reflection (below -60 dB in the 1200-1600 nm range) between a hollow core fiber and standard single mode optical fiber obtained through the combination of an angled interface and an anti-reflective coating. We perform experimental optimization of the interface angle to...
Poster
Full-text available
Dear All We organised a very successful Training School on Optical Wireless Communications for PhD students
Article
This paper investigates a multiple-input multiple-output (MIMO) super-Nyquist multi-band carrier-less amplitude and phase (Sm-CAP) visible light communication system to improve spectral efficiency (SE). In Sm-CAP, SE is improved by violating the frequency-domain orthogonality between sub-bands (SBs) at the cost of introducing a pre-determined inter...
Article
Full-text available
Today’s lowest-loss hollow core fibers are based on antiresonance guidance. They have been shown both theoretically and experimentally to have very low levels of backscattering arising from the fiber structure – 45 dB below that of traditional optical fibers with a solid silica glass core. This makes their longitudinal characterization using conven...
Poster
Full-text available
With the heavy use of standard optical telecommunication bands and the ever increasing RF spectra congestion, emerging spectral bands are becoming of great interest Possible technologies up to medium distances are visible light communications or free space optical links. The PhD research will be focused on the optical signal generation detection u...
Article
Wireless sensor networks (WSNs) are currently being deployed in everyday objects to collect and transmit information related to humidity, temperature, heartbeat, motion, etc. Such networks are part of the massive machine-type communication (mMTC) scenario within the fifth/sixth generation of wireless networks. In this paper, we consider the optimiz...
Conference Paper
Visible light communication (VLC) is a promising technology to improve the capacity of the existing indoor wireless communication systems. However, VLC also comes with security concerns in line with other wireless and wired transmission systems. In this regard, quantum key distribution (QKD) has been proposed as an optimal solution to enhance the s...
Preprint
Full-text available
The EU COST Action NEWFOCUS is focused on investigating radical solutions with the potential to impact the design of future wireless networks. It aims to address some of the challenges in OWC and establish it as an efficient technology that can satisfy the demanding requirements of backhaul and access network levels in 5G networks. This also includ...
Article
Full-text available
In this paper, we demonstrate the first, to our knowledge, experimental implementation of a gigabit Ethernet multiple input single output free space optical (FSO) communications link using adaptive switching implemented in the software defined open-source software, GNU Radio, and analyze its performance. A fully functional FSO link with a feedback...
Article
We demonstrate a fifth generation (5G) new radio (NR) signal transmitted by an analog optical and seamless antenna wireless connection at the frequency band of 60 GHz to exploit a high-frequency unlicensed frequency range. An optical frequency doubling technique, using two Mach-Zehnder modulators operating in a carrier suppressed and linear regime,...
Conference Paper
We demonstrate a 3-way interconnection device (hollow-core fiber, standard single-mode fiber and gas inlet) that is compact, low-loss, and easy-to-use. We demonstrate its performance on fibre purging, observing water vapor via infrared spectroscopy.
Conference Paper
By modifying the design of the interconnection between standard and hollow-core fibers, we achieved low insertion loss while creating a gap in between. This will allow for insertion of thin optical elements such as filters.
Article
Full-text available
With an emphasis on the real-time implementation of a practical carrier-less amplitude and phase (CAP) receiver for visible light communication (VLC), this paper proposes a full-digital architecture for the M-CAP receiver with synchronisation and adaptive blind equalisation. The architecture is mainly based on the observation that a CAP signal can...
Article
Full-text available
This paper describes the experimental demonstration of the hybrid optical/millimeter wave signal generation and transmission over combined optical fiber and free space optics fronthaul network with a seamless antenna link. An electrical bandpass filter is used to filter out the spectrum after photodetection in order to realize the seamless antenna...
Article
Full-text available
In this paper, we study the design aspects of an indoor visible light positioning (VLP) system that uses an artificial neural network (ANN) for positioning estimation by considering a multipath channel. Previous results usually rely on the simplistic line of sight model with limited validity. The study considers the influence of noise as a performa...
Article
Full-text available
The key challenge in free space optical (FSO) communications is combating turbulenceinduced fading. As the channel fading in FSO is quasi‐static, the transmission parameters such as the code rates, transmit power and modulation schemes can be modified with respect to the channel state information transmitted via the feedback path. As a result, adap...
Article
We analyze the performance of a hybrid visible-light/infrared optical wireless communications network for indoor Internet-of-Things applications. This approach can be used to connect multiple battery-powered sensor nodes using low-cost infrared light emitting diodes to transmit data to a master node located on the ceiling of a room. The master node...
Poster
Full-text available
Microwave photonics presents an advanced technology of optical devices and techniques for signal processing and transport of radio frequency (RF) signals for 5G and beyond networks. Optical fibers and optical wireless communication (OWC) links, used in microwave photonic systems as transmission mediums, have already shown their vast possibilities a...
Article
Full-text available
Visible light communications (VLC) is an emerging technology utilizing light emitting diodes and photodetectors (PDs) and cameras (i.e., image sensors (ISs)) as the transmitter and receivers (Rx), respectively for simultaneous data communications, illumination, localization and sensing in indoor optical Internet of Things. We propose, a single-inpu...
Article
Full-text available
We address the features channel characterization and performance evaluation for wireless body-area networks (WBANs) in medical applications during a walk scenario using optical wireless transmission. More specifically, we focus on optical extra-WBAN uplink communication between a central coordinator node (CN) placed on the patient’s body and an acc...
Article
We propose a stable full-duplex transmission of millimeter-wave signals over a hybrid single-mode fiber (SMF) and freespace optics (FSO) link for the fifth-generation (5G) radio access networks to accelerate the Industry 4.0 transformation.For the downlink (DL), we transmit 39 GHz subcarrier multiplexing (SCM) signals using variable quadrature ampl...
Article
Full-text available
With the increasing use of organic light emitting diodes (OLED) in lights, smart 13 phones, wearables smartwatches and computers, visible light-based device-to-device (D2D) 14 communications become more and more relevant. This paper proposes D2D communications 15 using the smart phone's display pixels and their built-in cameras. We investigate the...
Article
With the increasing use of organic light emitting diodes in lights, smart phones, wearable smartwatches, and computers, visible light-based device-to-device (D2D) communications has become more and more relevant. We propose D2D communications using smart phones’ display pixels and their built-in cameras. We investigate the impact of receiver orient...
Article
This paper presents results of an experimental measurement campaign involving the deployment of combined radio over the fiber and radio over free space optics (FSO) technology in the cloud-based fifth generation (5G) fronthaul network operating in the millimeter wave (mmW) area. For this purpose, we have used 10 km of optical fiber, 50 m long outdo...
Conference Paper
We demonstrate design of fiber Fabry-Perot c avities based on large-core graded-index multimode fibers. Smallest full width at half maximum along with maximum transmission is reached for core diameters over 200 µ m core and reflectivity above 99%.
Article
We report the fabrication of a hollow core fiber (HCF) coupled Faraday rotator mirror component with a total insertion loss below 1.1 dB and demonstrate its use in a polarization-stable all-fiber Michelson interferometer. The signal split into the two interferometer arms is performed using a standard 2x2 fused fiber coupler. One of the coupler outp...
Presentation
Full-text available
Dear All Congratulations to Zahra and Shivani for completing their PhD research as part of EU Horizon 2020 VISION project and being awarded the PhD. Well done to both and best wishes for the future. Thank you Stan and Fary
Article
Local and remote photonic millimeter wave (mmW) signal generation schemes are theoretically and experimentally evaluated in order to compare both approaches for practical deployment in a cloud-radio access network (C-RAN) fronthaul network. The paper presents a full comprehensive formulation of the frequency response of a system based on a directly...
Poster
Full-text available
Dear All, we have lost an excellent researcher, a fantastic colleague, a great friend and a wonderfull person :( Fary, Stan, Luis, Ali, Rafa, Erich, Rolando, Michael, Wai Pang and all other colleagues and friends
Conference Paper
Full-text available
In this work, a new indoor visible light positioning algorithm is proposed based on support vector machines (SVM) and polynomial regression. Two different multipath environments of an empty room and a furnished room are considered. The algorithm starts by addressing the received power distance relation, considering polynomial regression models fitt...
Conference Paper
Full-text available
In this paper, we study the novel idea of fiber optic lighting - optical camera communications. We carry out analyses of the proposed scheme employing a light emitting diode (LED) illuminated plastic optical fiber (POF) and a rolling-shutter-based camera as the transmitter and the receiver (Rx), respectively in an indoor static environment. We also...
Article
Full-text available
Networked optical wireless communication, also denoted as LiFi, is expected to play an important role in so-called smart hospitals. In this paper, we present the first experimental study of LiFi in an operating room at Motol University Hospital in Prague, Czech Republic. First, we perform one-to-one measurements using an optical transmitter (Tx) an...
Article
Full-text available
The telecommunication world is experiencing the 5th generation (5G) networks deployment including the use of millimeter wave (mmW) frequency bands to satisfy capacity demands. This leads to the extensive use of optical communications, especially the optical fiber connectivity at the last mile access and the edge networks. In this paper we outline f...
Article
Full-text available
In this paper, we investigate the performance of vehicular visible light communications based on the radiation patterns of different commercial taillights (TLs) using non-sequential ray tracing simulations. Our simulation results indicate a significant variation in the path loss compared with Lambertian model. Based on the ray tracing results, we p...
Article
Full-text available
This paper investigates a vehicle-to-vehicle relay-assisted visible light communications link with amplify-and-forward (AF) and decode-and-forward (DF) relaying schemes and analyze the effect of the relay vehicle’s orientation with respect to the source vehicle. Results show up to 150 % increase in the link span under emulated sunlight for the DF r...
Article
An equivalent circuit model for a typical commercial light-emitting diode (LED) used in visible light communication (VLC) applications is proposed. The parameters of the elements in the model are extracted from the measured impedance using a vector network analyser. The model shows high accuracy in fitting the measured results and shows the effect...
Article
Full-text available
Intelligent transport systems (ITS) rely upon the connectivity, cooperation and automation of vehicles aimed at the improvement of safety and efficiency of the transport system. Connectivity, which is a key component for the practical implementation of vehicular light communications (VeLC) systems in ITS, must be carefully studied prior to design a...
Conference Paper
p>Low-loss hollow-core fiber interconnection to standard optical fibers paves the way for high-finesse resonators, low-noise sensors, high-power delivery and next-generation fiberoptic communications. We will present main interconnection principles, discuss how back-reflection and higher-order mode excitation can be mitigated, and provide applicati...
Article
Full-text available
In this paper, we provide the first software-based implementation of multiple-input multiple-output (MIMO) free space optical (FSO) link with the adaptive switching based on the software defined radio developed by GNU Radio software system, which emulates the real-time capability of the proposed scheme. We propose a switching mechanism to independe...
Article
Full-text available
In this Letter, we propose and demonstrate a novel wireless communications link using an illuminating optical fiber as a transmitter (Tx) in optical camera communications. We demonstrate an indoor proof-of-concept system using an illuminating plastic optical fiber (POF) coupled with a light emitting diode and a commercial camera as the Tx and the r...
Conference Paper
We present angled interconnection between standard single-mode fiber and nested nodeless antiresonant fibers achieving an insertion loss of 0.45 dB and return loss below -60 dB over a wide (1450-1650nm) spectral range.
Article
Full-text available
This paper experimentally investigates, for the first time, a new wavelength-division multiplexing-based visible light communications link based on a defocused non-imaging multiple-input multiple-output (MIMO), which removes the need for tuned optical bandpass filters paired with each receiver. The proposed system is based on using the natural dive...
Conference Paper
In this paper, we present and experimentally evaluate a real-time 10 Gbps free-space optical (FSO) link under varying atmospheric conditions. In bandwidth-craving wireless technologies due to the ubiquitous consumption by internet of things devices and requiring high data rate online services, unlicensed FSO systems can be a promising candidate to...