Wszystkie pola: wireless communications - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Reliable and High QoS Wireless Communications over Harsh Environments
Autorzy:: Bilbao, J.
Calvo, A.
Armendariz, I.
Crespo, P.
Powiązania:: https://bibliotekanauki.pl/articles/307844.pdf
Data publikacji:: 2013
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: cooperative wireless networks
multicasting management techniques
next generation networks
opportunistic wireless
quality and performance evaluation
QoS
reliability and performance modelling
reliability of networks
wireless and mobile networks
Opis:: One of the most challenging research fields in which research community has taken a very active role is focused on trying to bring the features of wireless networks into line with the traditional wired solutions. Given the noisy and lossy nature of the wireless medium, it is more difficult to provide a comparable Quality of Service (QoS) and Reliability over wireless networks. This lack of reliability avoids the use of wireless solution in scenarios under harsh environment and mission-critical applications. In this paper we propose an inter-node collaborative schema with the aim of improving the achievable QoS level for multicast streaming, through the use of Network Coding and the algebra it is based on. We also present an implementation of the described algorithm on the OPNET discrete event simulation tool. Experimental results highlighting the performance achieved by the proposed algorithm and its improved efficiency as compared to other solutions are described.
Źródło:: Journal of Telecommunications and Information Technology; 2013, 1; 32-40
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Optical Wireless Communications Operated at Long-Wave Infrared Radiation
Autorzy:: Mikolajczyk, Janusz
Szabra, Dariusz
Prokopiuk, Artur
Achtenberg, Krzysztof
Wojtas, Jacek
Bielecki, Zbigniew
Powiązania:: https://bibliotekanauki.pl/articles/226104.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: optical wireless communication
free space optics
quantum cascade lasers
optoelectronics
telecommunications
Opis:: This paper presents some construction analysis and test results of a Free Space Optics system operating at the wavelength of 9.35 μm. In the system, a quantum cascade laser and a photoreceiver with mercury cadmium telluride photodetectors were used. The main parameters of these elements were discussed taking into account a data link operation. It also provides to determine a data range for various weather conditions related to scattering and scintillation. The results of numerical analyses defined the properties of currently available FSO technologies working in the near infrared or in the short infrared range of spectrum versus the performances of the developed system. The operation of this system was verified in three different test environments. The obtained results may also contain important issues related to the practical application of any FSO system.
Źródło:: International Journal of Electronics and Telecommunications; 2020, 66, 2; 383-387
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Ka Band-pass Filter Based on SIW Technology for Wireless Communications
Autorzy:: Damou, Mehdi
Benallou, Yassine
Chetioui, Mohammed
Boudkhil, Abdelhakim
Berber, Redouane
Powiązania:: https://bibliotekanauki.pl/articles/1839462.pdf
Data publikacji:: 2021
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: coupling matrix
DGS
filters
Ka band
SIW
Opis:: The paper proposes a new third-order Chebyshev bandpass filter based on the substrate integrated waveguide (SIW) manufacturing technology using an inductive iris and a defected ground structure (DGS) station to resonate in the Ka frequency band, intended for wireless communication applications. All steps that are necessary for designing such a filter have been described in detail based on specific analytical equations harnessed to calculate the different synthesizable parameters of the proposed band-pass filter design, such as the coupling matrix, quality coefficients and initial geometric dimensions. The filter’s ideal frequency response is extracted from an equivalent circuit employing localized elements developed with the use of Design Microwave Office Software. Otherwise, HFSS is employed to set the initial parameters of the proposed topology that will not meet the target specifications defined previously. Accordingly, optimization procedures are necessary for different SIW band-pass filter parameters to reach a high frequency response for the proposed design. The detailed results presented show high efficiency of the SIW technology that offers good performance with lower filter volumes. Two topologies have been developed and then optimized to demonstrate the usefulness of EM software.
Źródło:: Journal of Telecommunications and Information Technology; 2021, 2; 49--56
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: A New Implementation of UWB CRLH Based Antennas for Wireless Communications
Autorzy:: Alibakhshi-Kenari, M.
Naser-Mogaddasi, M.
Powiązania:: https://bibliotekanauki.pl/articles/307909.pdf
Data publikacji:: 2015
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: composite right/left-handed transmission lines
metamaterial
modern wireless communication systems
portable device
printed Q-shaped antennas
small antennas
ultra-wideband antennas
Opis:: In this article, a novel ultra wideband (UWB) small antennas based on the composite right/left-handed transmission lines structures are proposed. The antennas are pre- sented with best in size, bandwidth and radiation patterns. Their physical size and the operational frequency depend on the unit cell size and the equivalent transmission line model parameters of the CRLH-TL. To realize characteristics of frst proposed model, Q-shaped gaps printed into rectangular radiation patches are used. The antenna based on composite right/left-handed transmission lines is composed of two unit cells, each of which occupies only 10.8 x 8.6 mm and covers the 2.7{9.3 GHz bandwidth for VSWR < 2. The peak gain and radiation effciency, are 5.78 dBi and 42.1% 9.3 GHz, respectively. Moreover, the second designed antenna has the same size and enhancement bandwidth, gain and radiation effciency than the rst proposed antenna with similar design procedure. It is constructed of the printed Q-shaped four unit cells. The length, width and height are 21.6, 8.6 and 1.6 mm, respectively, and it covers 4.1{11.7 GHz bandwidth for VSWR < 2 having highest gain (7.18 dBi) and radiation effciency (92.69%) at 4.1 GHz.
Źródło:: Journal of Telecommunications and Information Technology; 2015, 1; 42-52
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Characterization of Propagation Models in Wireless Communications for 4G Network
Autorzy:: Al-Aamri, Nawal
Nadir, Zia
Al-Lawati, Hassan
Suwailam, Mohammed Bait
Powiązania:: https://bibliotekanauki.pl/articles/2055256.pdf
Data publikacji:: 2022
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: path loss model
prediction
4G
RMSE
Opis:: Estimating the pathloss and signal strength of the transmitted signal at specific distances is one of the main objectives of network designers. This paper aims to provide generalized pathloss models appropriate for urban areas in Muscat the capital city of the Sultanate of Oman environment. The research includes studying different models of pathloss for the 4G cellular network at Muttrah Business District (MBD) at Muscat. Different models (Free Space model, Okumura Hata, Extended Sakagami, Cost231 Hata, ECC-33 Hata – Okumura extended, Ericsson, Egli, and SUI) are used with 800MHz. The results of the prediction models are compared with real measured data by calculating RMSE. The generalized models are created by modified original models to get accepted RMSE values. Different cells at MBD are tested by modified models. The RMSE values are then calculated for verification purposes. To validate the modified pathloss models of 4G, they are also applied at different cells in a different city in the capital. It has approximately the same environment as MBD. The modified pathloss models provided accepted predictions in new locations.
Źródło:: International Journal of Electronics and Telecommunications; 2022, 68, 1; 137--143
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Selected aspects of non-orthogonal multiple access for future wireless communications – for IoT
Autorzy:: Wysocki, Tadeusz A.
Flizikowski, Adam
Marciniak, Tomasz
Powiązania:: https://bibliotekanauki.pl/articles/2016292.pdf
Data publikacji:: 2020
Wydawca:: Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydawnictwo PB
Tematy:: IoT networks
NOMA
5G
Opis:: This paper has provided an overview of selected IoT architectures, relevant requirements towards 5G (and beyond) systems as well as indication of NOMA techniques suitability as a multiple access technique and recent developments in the area of radio interface for IoT coexisting with 5G (and beyond) mobile networks. The authors assume that IoT networks in the future will be augmented with NOMA-capable sink-nodes (proxy or gateway) that can deliver aggregated data from multiple sensors for delivery to the cloud or other server. The main aim of this paper is to go beyond state of the art available nowadays and indicate directions for NOMA that make it even more attractive in combination with edge computing, cloud-RAN and especially AI/ML to improve future 6G networks.
Źródło:: Zeszyty Naukowe. Telekomunikacja i Elektronika / Uniwersytet Technologiczno-Przyrodniczy w Bydgoszczy; 2020, 24; 45-65
1899-0088
Pojawia się w:: Zeszyty Naukowe. Telekomunikacja i Elektronika / Uniwersytet Technologiczno-Przyrodniczy w Bydgoszczy
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Application of EMF Emission Measurement Techniques to Wireless Communications Systems for Compliance With Directive 2004/40/EC
Autorzy:: Simunic, D.
Gajsek, P.
Powiązania:: https://bibliotekanauki.pl/articles/90092.pdf
Data publikacji:: 2006
Wydawca:: Centralny Instytut Ochrony Pracy
Tematy:: compliance
measurement techniques
wireless communications systems
Directive 2004/40/EC
prawo
prawo pracy
pole elektromagnetyczne
ocena ryzyka zawodowego
dyrektywa 2004/40/WE
Opis:: Europe is the only region in the world with common legislative acts regulating exposure to electromagnetic fields (EMF) for both the general public and workers. Council Recommendation 1999/519/EC deals with the limitation of exposure of the general public to EMF (0 Hz—300 GHz). Directive 2004/40/EC regulates the minimum health and safety requirements regarding the exposure of workers to the risks arising from EMF. This paper discusses the general application of existing standards and recommendations in measurement techniques for determining compliance of measured exposure limit values and action values with those defined in 2004/40/EC.
Źródło:: International Journal of Occupational Safety and Ergonomics; 2006, 12, 2; 177-186
1080-3548
Pojawia się w:: International Journal of Occupational Safety and Ergonomics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: A novel type of wearable dual-band antenna based on coplanar waveguide feeding for wearable wireless communications
Autorzy:: He, Zhengrui
Jin, Jie
Powiązania:: https://bibliotekanauki.pl/articles/1835773.pdf
Data publikacji:: 2021
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: wearable antenna
dual-band antenna
CPW-feed
metasurface
Opis:: A flexible and compact coplanar waveguide feed (CPW-fed) wearable antenna is introduced for wireless wearable communications applications at the industrial scientific medical (ISM) band. The proposed antenna consists of copper, which is used as the radiation patch and ground planes printed on the same side of polyimide flexible substrate. The overall size of the antenna is 30 mm × 28 mm × 0.08 mm, the results show that the antenna can transmit and receive signals in two frequency bands of 1.89–2.67 GHz and 3.02–3.23 GHz, in which radiating properties are characterized and agree well with the simulation results. The antenna is bent in different directions to further investigate the reflection coefficient and corresponding effect on the antenna under bending. The center frequency of the antenna is slightly shifted towards higher and lower frequencies when antenna is bent in X-axis and Y-axis, respectively. Furthermore, the wearability of the antenna is verified when the antenna is placed on different parts of the human body such as wrist and chest. Hence, the proposed flexible antenna is a suitable candidate for wearable wireless communication applications.
Źródło:: Optica Applicata; 2021, 51, 2; 159-170
0078-5466
1899-7015
Pojawia się w:: Optica Applicata
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Analiza sygnałów chaotycznych do realizacji kryptograficznie bezpiecznego bezprzewodowego kanału komunikacyjnego
Analysis of chaotic signals for cryptographically secure wireless communications
Autorzy:: Czernik, P.
Winiecki, W.
Powiązania:: https://bibliotekanauki.pl/articles/157904.pdf
Data publikacji:: 2012
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: autonomiczne bezprzewodowe sieci czujnikowe
kryptografia
rozproszone systemy pomiarowo-sterujące
generatory liczb losowych
teoria chaosu
sygnały chaotyczne
autonomous wireless sensor networks
distributed measurement and control systems
random number generators
chaotic theory
chaotic signals
Opis:: W artykule przedstawiono właściwości sygnałów chaotycznych specyficznych do zastosowań w kryptograficznie bezpiecznej komunikacji bezprzewodowej dla rozproszonych systemów pomiarowo-sterujących, w szczególności bezprzewodowych sieci czujnikowych. Przeanalizowano zjawisko synchronizacji dwóch układów chaotycznych. Zaprezentowano analizę symulacyjną modeli generatorów sygnałów chaotycznych bazujących na nieliniowych układach dynamicznych, popartą wynikami eksperymentalnymi.
This paper presents specific properties of chaotic signals applicable to cryptographically secure wireless communications. Chaotic signals have characteristics that significantly distinguish them from signals commonly used in wireless distributed measurement and control systems. The most important feature of the chaotic signal is its exponential sensitivity to initial conditions. Due to the finite measurement accuracy it is very difficult to predict the signal value after a certain time from the execution of the measurement. Moreover, it is very difficult to determine prior values of the signal having particular measurement result. Different characteristics of this type of electrical signals result in a number of potential ad-vantages which are as follows: low probability of transmission detection (capture), possibility of using occupied bandwidth, resilience to errors caused by multipath propagation, lower transmission power, possibility of coherent transmission and communication privacy. The paper deals with an analysis of the phenomenon of synchronization of two chaotic systems. The ob-tained simulation and experimental results of different chaotic signal generator models using nonlinear dynamical circuits are presented and discussed.
Źródło:: Pomiary Automatyka Kontrola; 2012, R. 58, nr 9, 9; 785-788
0032-4140
Pojawia się w:: Pomiary Automatyka Kontrola
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Praktyczne aspekty projektowania urządzeń bezprzewodowej sieci ZigBee. Przegląd parametrów technicznych platform sprzętowo-programowych
Practical aspects of designing devices for ZigBee wireless network
Autorzy:: Kaczmarek, J.
Kozioł, M.
Powiązania:: https://bibliotekanauki.pl/articles/152036.pdf
Data publikacji:: 2008
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: ZigBee
sieci bezprzewodowe
komunikacja bezprzewodowa
wireless network
wireless communications
Opis:: W artykule dokonano porównania trzech platform sprzętowo-programowych, które stanową podstawę w procesie projektowania urządzeń bezprzewodowej sieci ZigBee. Ze względu na ciągły rozwój standardu, wybór odpowiedniej platformy zarówno do zadań badawczych, jak i rozwiązań komercyjnych jest trudny i uwarunkowany wymienionymi w artykule kryteriami, takim jak: energooszczędność, zasoby sprzętowe i koszt realizacji. Jak wynika z dokonanego przeglądu, nie można wskazać jednej platformy, która spełniałaby w pełni stawiane kryteria.
This paper presents a comparison of three hardware-software platforms, which are the basis for designing ZigBee devices. The continuous development of ZigBee standard makes a selection of the right platform difficult both to research tasks and commercial solutions. The rating of compared platforms was achieved with the use of criteria: power savings, hardware resources and economical aspects. As has been shown in the presented review of the ZigBee platforms, there is no only one platform meeting all criteria.
Źródło:: Pomiary Automatyka Kontrola; 2008, R. 54, nr 6, 6; 356-358
0032-4140
Pojawia się w:: Pomiary Automatyka Kontrola
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: On a method to improve correlation properties of orthogonal polyphase spreading sequences
Autorzy:: Wysocki, B. J.
Wysocki, T. A.
Powiązania:: https://bibliotekanauki.pl/articles/307741.pdf
Data publikacji:: 2003
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: spread spectrum communications
orthogonal sequences
wireless communications
wireless LAN
correlation
Opis:: In this paper, we propose a simple but efficient method for improving correlation properties of polyphase spreading sequences for asynchronous direct sequence code division multiple access (DS CDMA) applications. The proposed method can be used to reduce the mean square value of aperiodic crosscorrelation or the mean square value of aperiodic autocorrelation, the maximum value of aperiodic crosscorrelation functions, merit factor or other properties of the sequence set. The important feature of the method is that while it modifies correlation properties of the sequence set, it preserves sequence orthogonality for perfect synchronization, if this is the property of the original sequence set.
Źródło:: Journal of Telecommunications and Information Technology; 2003, 2; 99-105
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Using FDTD method to the analysis of electric field intensity inside complex building constructions
Autorzy:: Choroszucho, Agnieszka
Stankiewicz, Jacek Maciej
Powiązania:: https://bibliotekanauki.pl/articles/378245.pdf
Data publikacji:: 2019
Wydawca:: Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:: finite-difference time-domain method (FDTD)
wireless communications
systems
electromagnetic wave propagation
building materials
Opis:: The aim of this article is to make a detailed analysis of the influence of the reinforcement diameter, the number of rows of reinforcing bars and the spacing between them for the values of the electric field intensity. The subject of the research is a model containing a wall made of concrete (dielectric) and reinforcement (conductor). Four reinforcement systems commonly used in building construction have been analysed. In addition, the influence of symmetry and asymmetry in the structure of bars on the values of field intensity determined for non-homogeneous material structures (reinforced concrete) was considered. For comparison, a concrete wall, without reinforcement (homogeneous material) was also analysed. Using FDTD method, the maximum electric field values generated by the Wi-Fi operating at the f = 2.4 GHz were calculated.
Źródło:: Poznan University of Technology Academic Journals. Electrical Engineering; 2019, 97; 39-48
1897-0737
Pojawia się w:: Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Integration of home digital network and Bluetooth wireless communication system
Autorzy:: Keller, T.
Modelski, J.
Powiązania:: https://bibliotekanauki.pl/articles/309237.pdf
Data publikacji:: 2003
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: komunikacja bezprzewodowa
multimedia
usługi multimedialne
wireless communications
multimedia systems
multimedia services
multimedia home platform
digital network
Opis:: The paper presents new method of integration home digital network with Bluetooth wireless communication system. In this new application Bluetooth is used as one of the main ways of communication and information exchange between elements of the system for integrated, centralized control of the digital devices in the multimedia home platform. Bluetooth enables communication between multimedia gateway with the HTTP server inside and personal communication assistants (PCA), special kind of the remote control. The aim of the system is centralization of services in the multimedia gateway and integration of different services using only one control device.
Źródło:: Journal of Telecommunications and Information Technology; 2003, 1; 45-50
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Możliwość wykorzystania sieci radiowych w topologii MESH do łączności bezprzewodowej pomiędzy agregatami rolniczymi
Possibility of using radio networks in the MESH topology for wireless communications between farm machinery units
Autorzy:: Langman, J.
Langman, M.
Powiązania:: https://bibliotekanauki.pl/articles/287350.pdf
Data publikacji:: 2008
Wydawca:: Polskie Towarzystwo Inżynierii Rolniczej
Tematy:: sieć Wi-Fi
MESH
rolnictwo precyzyjne
WiFi network
precise agriculture
Opis:: W pracy przedstawiono możliwości zorganizowania sieci bezprzewodowej w miejscu pracy agregatów rolniczych wykorzystując technologię MESH. W rolnictwie precyzyjnym ciągły przepływ informacji między pracującymi w polu agregatami a siedzibą gospodarstwa jest niezmiernie istotny. Zaprezentowana technologia i topologia MESH pozwoli na utworzenie samoorganizującej się sieci bezprzewodowej, węzły ruchome tej sieci zainstalowane są na pracujących agregatach rolniczych.
The paper presents possibilities to organise wireless networks in places where farm machinery units are operated, using the MESH technology. In precise agriculture, continuous flow of information between machinery units working in field and farm office is extremely important. Presented technology and MESH topology will allow to develop a self-organising wireless network; mobile nodes of this network are installed in working farm machinery units.
Źródło:: Inżynieria Rolnicza; 2008, R. 12, nr 7(105), 7(105); 129-134
1429-7264
Pojawia się w:: Inżynieria Rolnicza
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: Improving the Efficiency of UAV Communication Channels in the Context of Electronic Warfare
Autorzy:: Semendiai, Serhii
Tkach, Yuliіa
Shelest, Mykhailo
Korchenko, Oleksander
Ziubina, Ruslana
Veselska, Olga
Powiązania:: https://bibliotekanauki.pl/articles/27311946.pdf
Data publikacji:: 2023
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:: cognitive radio
software-defined radio
neural networks
coding
electronic warfare
communication channel
wireless communications
spectrum analysis
Opis:: The article is devoted to the development of a method for increasing the efficiency of communication channels of unmanned aerial vehicles (UAVs) in the conditions of electronic warfare (EW). The author analyses the threats that may be caused by the use of electronic warfare against autonomous UAVs. A review of some technologies that can be used to create original algorithms for countering electronic warfare and increasing the autonomy of UAVs on the battlefield is carried out. The structure of modern digital communication systems is considered. The requirements of unmanned aerial vehicle manufacturers for onboard electronic equipment are analyzed, and the choice of the hardware platform of the target radio system is justified. The main idea and novelty of the proposed method are highlighted. The creation of a model of a cognitive radio channel for UAVs is considered step by step. The main steps of modelling the spectral activity of electronic warfare equipment are proposed. The main criteria for choosing a free spectral range are determined. The type of neural network for use in the target cognitive radio system is substantiated. The idea of applying adaptive coding in UAV communication channels using multicomponent turbo codes in combination with neural networks, which are simultaneously used for cognitive radio, has been further developed.
Źródło:: International Journal of Electronics and Telecommunications; 2023, 69, 4; 727--732
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

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