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Search results for: RADIO%20COMMUNICATIONS

  • Radio Channel Measurements in Body-to-Body Communications in Different Scenarios

    Publication

    - Year 2016

    This paper presents body-to-body radio channel measurements at the 2.45 GHz band, for different body motion scenarios and on-body antenna placements, and both indoor and outdoor environments. Measurement equipment, investigated scenarios and considered environments are described, an initial analysis of results being presented. The mean path loss and the standard deviation depend on the mutual location of transmitting and receiving...

  • Radio Channel Measurements in Body-to-Body Communications in Different Scenarios

    Publication

    - Year 2016

    This paper presents body-to-body radio channel measurements at the 2.45 GHz band, for different body motion scenarios and on-body antenna placements, and both indoor and outdoor environments. Measurement equipment, investigated scenarios and considered environments are described, an initial analysis of results being presented. The mean path loss and the standard deviation depend on the mutual location of transmitting and receiving...

  • Impact of radio wave polarisation on off-body communications in indoor environments

    Publication

    - Year 2015

    This paper describes the measurements and the analysis of the impact of radio wave polarisation on off-body communications in Body Area Networks in indoor environments. Measurements on polarisation impact are briefly described. Five investigated scenarios with different body postures and different antenna placements are characterised. The difference between the vertical and horizontal components of the received radio signal are...

  • Radio Channel Measurements in Off-Body Communications in a Ferry Passenger Cabin

    Publication

    - Year 2017

    This paper presents an off-body radio channel measurements in a ferry passenger cabin at 2.45 GHz band, for static sleeping scenarios with different body orientation and on-body antennas placements, and also for upper and lower sleeping berths. The measurements have been performed with two types of on-body wearable receiving antennas: FlexPIFA (flexible planar inverted F antenna), and FlexNotch (flexible adhesive-backed notch antenna)...

  • Sławomir Jerzy Ambroziak dr hab. inż.

    People

    Department of Radiocommunication Systems and Networks

    Sławomir J. Ambroziak was born in Poland, in 1982. He received the M.Sc., Ph.D. and D.Sc. degrees in radio communication from Gdańsk University of Technology (Gdańsk Tech), Poland, in 2008, 2013, and 2020 respectively. Since 2008 he is with the Department of Radiocommunication Systems and Networks of the Gdańsk Tech: 2008-2013 as Research Assistant, 2013-2020 as Assistant Professor, and since 2020 as Associate Professor. He is...

  • Radio Channel Measurements in 868 MHz Off-Body Communications in a Ferry Environment

    Publication

    - Year 2017

    In this paper, a characterization of the 868 MHz off-body radio channel in BANs is presented. Measurements were carried out in a ferry environment using a specific set-up. A method for path loss using radio distance measurements (RDMs) was developed. It allows to automate the measurements process and make it independent from the variable speed of a moving person. Based on the observed path loss as a function of distance, the obtained...

  • Measurement and Analysis of the Radio Wave Polarisation in Off-Body Communications in Indoor Environment

    Publication

    - Year 2014

    The paper describes an analysis of the radio wave polarisation in off-body communications in indoor environment. The measurement stand for polarisation measurements has been shortly described. Five investigated scenarios with different body postures and different antenna placements have been characterize. The vertical and horizontal components of received radio signal have been analysed. The measure used in analysis is a ratio...

  • Radio Physics and Radio Astronomy

    Journals

    ISSN: 1027-9636 , eISSN: 2415-7007

  • Jacek Stefański prof. dr hab. inż.

    People

    Faculty of Electronics, Telecommunications and Informatics, Department of Radiocommunication Systems and Networks

    JJacek Stefański received M.Sc., Ph.D. and D.Sc. degrees in telecommunications engineering from Gdansk University of Technology (GUT), Poland, in 1993, 2000 and 2012, respectively. Awarded title of Professor by the President of Poland in 2020. Currently, he works as a professor at the Department of Radio Communication Systems and Networks (DRCSN) in GUT. From 2005 to 2009, he worked as an assistant professor in the National Institute...

  • Radio Journal

    Journals

    ISSN: 1476-4504

  • RADIO SCIENCE

    Journals

    ISSN: 0048-6604 , eISSN: 1944-799X

  • Wideband Radio Direction Finder Implemented in Software Defined Radio Technology

    Publication

    - Applied Mechanics and Materials - Year 2015

    In the paper a wideband radio direction finder (RDF) implemented in software defined radio (SDR) technology and the results of hardware layer research, including developed antenna switching unit (ASU), are presented. The results of tests of the devices, which are the part of the software defined radio platform (SDRP), and antenna switching unit, confirmed the possibility of using selected components in the final solution.

  • Ratio

    Journals

    ISSN: 0034-0006 , eISSN: 1467-9329

  • Advances in Radio Science

    Journals

    ISSN: 1684-9965 , eISSN: 1684-9973

  • Survey of Radio Navigation Systems

    Publication

    - International Journal of Electronics and Telecommunications - Year 2015

    At present, there is a growing demand for radio navigation systems, ranging from pedestrian navigation to consumer behavior analysis. These systems have been successfully used in many applications and have become very popular in recent years. In this paper we present a review of selected wireless positioning solutions operating in both indoor and outdoor environments. We describe different positioning techniques, methods, systems,...

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  • Ultraszerokopasmowe (UWB) radio impulsowe

    Publication

    - Year 2005

    Opisano podstawy budowy i działania impulsowego systemu UWB. Poruszono problem widma sygnału radiowego w tym systemie.

  • CHEMICAL COMMUNICATIONS

    Journals

    ISSN: 1359-7345 , eISSN: 1364-548X

  • The Influence of the Radio Channel on Precision of Position Estimation of the User Terminal Using the NB-IoT Radio Interface

    Publication

    - Year 2023

    In the article the method of user terminal position estimation using the broadcast signals transmitted in the downlink of the NB-IoT interface was presented, including the analysis of the radio channel influence on precision of position estimation as well as the eNodeB (Evolved Node B) synchronization. The practical ability to estimate the position in the test area has been verified in the laboratory conditions, using the reference...

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  • Trunked Radio Solutions for Special Application

    Publication

    - International Journal of Electronics and Telecommunications - Year 2014

    In the paper modern concepts of radio communication trunking-dispatch systems for special applications are presented. Basic standards of TETRA, DMR, and cdma2000 are mentioned. The aim of the paper is to present innovative trunking solutions based on the LTE system working both in FDD and TDD mode. The architecture of LTE trunked radio is shown as well as new services possible to implementation are described. The way of TETRA and...

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  • Radio programowalne - nowoczesna platforma dydaktyczna

    Publication

    - Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne - Year 2014

    Przedstawiono technologię radia programowalnego jako nowoczesną platformę dydaktyczną. Zaproponowane podejście pozwala na efektywniejsze planowanie stanowisk laboratoryjnych. Umożliwia skrócenie czasu realizacji etapów związanych z projektowaniem, symulacją i testowaniem działania łącza radiowego. Pozwala również na elastyczną zmianę stanowisk laboratoryjnych zgodnie z dynamicznym rozwojem współczesnych systemów radiokomunikacyjnych.

  • Measuring research on radio wave propagation

    Publication

    - Year 2010

    Telecommunication connections are increasingly based on the wireless links, both fixed and mobile, carried out under different radio systems. This kind of solution has many advantages. However, the propagation medium is a factor that causes many difficulties in designing wireless networks, because of large diversity of propagation environments. Transmission loss in each environment is determined by many variables phenomena and...

  • Improvement of impulse radio electromagnetic compatibility

    Publication

    - Year 2008

    Publikacja zawiera opis jednej z możliwych technik modyfikacji widma sygnału ultraszerokopasmowego radia impulsowego na przykładzie standardu IEEE 802.15.4a, opartą o zmianę struktury sekwencji generowanych impulsów o bardzo krótkim czasie trwania. Technika ta może zmniejszyć ryzyko wzajemnych zakłóceń pomiędzy nowymi urządzeniami ultraszerkopasmowymi a istniejącymi urządzeniami radiokomunikacji wąskopasmowej

  • ELECTROCHEMISTRY COMMUNICATIONS

    Journals

    ISSN: 1388-2481 , eISSN: 1873-1902

  • Ratio Juris

    Journals

    ISSN: 1794-6638 , eISSN: 0952-1917

  • SYNTHETIC COMMUNICATIONS

    Journals

    ISSN: 0039-7911 , eISSN: 1532-2432

  • Relativistic runaway breakdown in low-frequency radio

    Publication
    • M. Füllekrug
    • R. Roussel-Dupré
    • E. Symbalisty
    • O. Chanrion
    • A. Odzimek
    • O. van
    • T. Neubert

    - JOURNAL OF GEOPHYSICAL RESEARCH - Year 2010

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  • Localization of Mobile Robot Using Radio Waves

    Publication

    - Solid State Phenomena - Year 2009

    Opisano systemy lokalizacji robotów mobilnych wykorzystujące metody triangulacji i trilateracji, w przestrzeniach dwuwymiarowych. Zaproponowano metodę pomiaru odległości drogą radiową oraz przedstawiono uzyskane wyniki badań.

  • Hyperbolic Asynchronous Method of a Radio Navigation Technique

    Publication

    - Applied Sciences-Basel - Year 2020

    Humans have always wanted to determine position in an unknown environment. At the beginning methods were simple. They were based on the observation of characteristic points, in the case of shipping additional observations of the coastline. Then came navigation based on astronomical methods (astronavigation). At the beginning of the XX-century a new way of determining the current location was developed. It has used radiowave signals....

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  • Novel applications of noise in sensing and communications

    Publication
    • L. B. Kish
    • R. Mingesz
    • Z. Gingl
    • G. Schmera
    • J. Smulko
    • C. Kwan
    • P. Heszler
    • C. G. Granqvist

    - Year 2007

    Przedstawiono zaproponowane w ostatnich latach sposoby wykorzystania szumów do wykrywania gazów, jako źródła informacji o atmosferze otaczającej czujnik. Ponadto, przedstawiono możliwości wykorzystania zjawisk losowych do bezpiecznej komunikacji.

  • Journal of Radio & Audio Media

    Journals

    ISSN: 1937-6529 , eISSN: 1937-6537

  • Towards 5G — Cloud-based Radio Access Networks

    Publication

    - Zeszyty Naukowe Akademii Marynarki Wojennej - Year 2017

    In the paper a general concept of the 5G network architecture is presented as well as system requirements having impact on innovative solutions in the 5G network are highlighted. A major part of the paper is both presentation and discussion of the problem of Cloud Radio Access Network introduction for public networks in which the cell and resource virtualisation will be implemented. On the other hand, the problem of resource virtualization...

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  • Modernization of large music studio at Polish Radio Szczecin

    Publication

    - Year 2011

    Studio Muzyczne S-1 w Polskim Radiu Szczecin należy do największych studiów nagrań w Polsce. Wymiary studia wynoszą 15.3 x 17 x 8.6 m, powierzchnia 261 m2, kubatura 2244 m3. W wyniku licznych korekt akustycznych dokonanych w ciągu ostatnich lat, warunki akustyczne studia są akceptowane przez szeroki krąg realizatorów i wykonawców, co uznano to za cenny i trudno odtwarzalny walor techniczny. W związku z tym, modernizację Studia...

  • Radio Link Measurement Methodology for Location Service Applications

    Publication

    - Metrology and Measurement Systems - Year 2012

    The aim of this paper is the methodology of measurements executed in a radio link for the realization of radiolocation services in radiocommunication networks, particularly in cellular networks. The main results of the measurements obtained in the physical layer of the universal mobile telecommunications system (UMTS) are introduced. A new method for the utilization of the multipath propagation phenomenon to improve the estimation...

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  • Radio programowalne - przyszły standard inteligentnego systemu radiokomunikacyjnego

    Publication

    - Year 2007

    W pracy przedstawiono całkowicie nowatorską koncepcję programowalnego systemu radiokomunikacyjnego zwłaszcza w odniesieniu do inteligentnego terminala użytkownika w tym systemie. Na wstępie omówiono platformę sprzętową takiego rozwiązania. Następnie przedstawiono rozwiązanie systemowe platformy informatycznej, poczynając od jej charakterystyki funkcjonalnej, poprzez opis środowiska programowego koniecznego do realizacji niezbędnych...

  • Accuracy analysis of the radio location service in the sea environment

    Publication

    - POLISH JOURNAL OF ENVIRONMENTAL STUDIES - Year 2007

    W artykule przedstawiono koncepcję systemu bezpieczeństwa na morzu w oparciu o istniejące systemy komórkowe. Scharakteryzowano problem lokalizowania terminala ruchomego przez sieć w warunkach morskich. Przedstawiono wyniki badań przeprowadzonych w warunkach rzeczywistych w odniesieniu do efektywności lokalizowania terminala na morzu. Przedstawiono wnioski, wypływające z przeprowadzonych analiz.

  • Design of radio communication systems for unmanned transport applications

    Publication

    - Archives of Transport System Telematics - Year 2016

    In the paper the principle of OFDMA-based radio communication systems design for unmanned transport applications is presented. The concept of system radio interface is analysed and its basic parameters proposal are considered. In the last part of the paper some air interface characteristics useful for optimization of throughput and system capacity are considered.

  • Calculation of the propagation loss in urban radio-access systems

    Publication

    - IEEE ANTENNAS AND PROPAGATION MAGAZINE - Year 2008

    Zweryfikowano eksperymentalnie modele propagacyjne opracowane dla telefonii komórkowej w mieście, stosowane przy analizach projektowych systemów dostępowych. Przeprowadzono obszerne badania pomiarowe i zebrano prawie 19 tys. pomiarów. Na tej podstawie, stosując wielowymiarową analize regresji oraz zaproponowaną charakterystykę propagacyjną radiowych łączy dostępowych, opracowano nowy wielowariantowy model propagacyjny przeznaczony...

  • Nature Communications

    Journals

    ISSN: 2041-1723

  • M2M communications system proposal for maritime applications

    Publication

    - Zeszyty Naukowe Akademii Marynarki Wojennej - Year 2017

    This article describes the proposal to use the M2M communication to enhance the safety of people, ships and other marine infrastructure, in broadly defined marine systems. In addition, there are numerous examples of planned solutions to be implemented in the near future as well as new services. The proposal for M2M communication system architecture is described below. In addition, the use of the STRUGA system radio interface as...

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  • OFDM modulation and adaptive equalisation for underwater communications.

    Publication

    - Year 2005

    Własności transmisyjne płytkiego kanału podwodnego są ograniczone ze względu na wielokrotne odbicia fal dźwiękowych od dna i powierzchni wody oraz ze względu na niestacionarność powodowaną głównie przez ruch powierzchni wody. W celu minimalizacji wpływu interferencji międzysymbolowych, powodowanych przez wielodrogową propagację fal dźwiękowych, w tradycyjnych wąskopasmowych modemach telekomunikacyjnych stosowane są złożone equalizery...

  • Design of M2M Communications Interfaces in Transport Systems

    Publication

    - Year 2016

    In the paper the principle of M2M communications in transport systems is presented. The concept of M2M system architecture is considered. Characteristics of M2M communications for example data transmission, monitoring and other services for transport applications are presented. The problem of communications interfaces design for M2M applications is analysed. Next, the proposal of M2M communication interface for transport applications...

  • Technika radia impulsowego

    Publication

    - Year 2005

    Przedstawiono zasadę działąnia analogowego oraz cyfrowego systemu radia impulsowego. Omówiono strukturę stosowanych sygnałów oraz budowę i działanie układów odbiorczych w tym systemie.

  • Technika radia programowalnego.

    Publication

    - Year 2004

    Podstawowym problemem związanym z wprowadzeniem do użytku techniki radia programowalnego są ograniczenia w rozwoju technologii układów scalonych. Należy także brać pod uwagę tzw. ewolucyjną koncepcję rozwoju systemów radiokomunikacji komórkowej, tzn. zainicjowane obecnie przechodzenie od systemów drugiej do systemu trzeciej generacji, co najbardziej widoczne jest w procesie zmian systemu GSM poprzez system GPRS w kierunku systemu...

  • Radio Simulcasting at a Glance: a New Look at Broadcasting and Streaming Services

    Publication

    - Year 2018

    Radio is by far one of the most popular and accessible medium. With its availability it attracts listeners all around the world. There are numerous ways of delivering content to consumers. The present situation is characterized by the convergence of acoustics, computer science and telecommunications. This paper reviews the current status of radio broadcasting and streaming services. It describes a subjective study concerning different...

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  • DAB vs DAB+ Radio Broadcasting: a Subjective Comparative Study

    Publication

    - Archives of Acoustics - Year 2017

    In the age of digital media, delivering high quality content to consumers is one of the most demanding tasks. There exist numerous broadcasting standards, with different pros and cons, and the DAB/DAB (Digital Audio Broadcasting) system is one of the most popular among them. From an engineer’s perspective, efficient resource management under limited bandwidth conditions has always been a challenge. In this paper a subjective quality...

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  • Efficiency of IEEE 802.15.4a UWB Impulse Radio Spectrum Shaping

    Publication

    - Year 2010

    This paper presents results of impulse radio signal spectrum shaping efficiency investigations. Basic parameters of IEEE 802.15.4a UWB signal and outline of proposed spectrum shaping methods are briefly described. The main part of the paper presents influence of signal and algorithms parameters on the results of spectrum shaping.

  • Transmission Quality in MC-CDMA Radio Interface with Turbo Codes

    Publication

    - Year 2012

    Multi-Carrier Code Division Multiple Access techiques is a combination of two radio access techniques: Code Division Multiple Access (CDMA) and Orthogonal Frequency-called Division Multiplexing (OFDM) and has the advantages of both techniques. The paper presents the design of transmitter and receiver for MC-CDMA radio interface and the simulation results of the transmission quality in AWGN channel.

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  • Propagation analysis of the point-to-point radio links operating in the band

    Publication

    - POLISH JOURNAL OF ENVIRONMENTAL STUDIES - Year 2009

    The theoretical possibilities of utilizing the EHF-band frequencies for point-to-point short range communications have been discussed. The most important factors that affect propagation attenuation in this band have been briefly described, as well as relevant mathematical formulas that allow for numerical analysis of these phenomena. After that, a research have been carried out in which the authors have analyzed propagation losses...

  • On efficiency of layer 2 of the radio interface protocol stack in UMTS

    Publication
    • P. Matusz

    - Year 2006

    Celem pracy jest szczegółowa analiza funkcjonowania warstwy łącza danych w podsystemie dostępu radiowego UTRAN systemu UMTS i na tej podstawie przedstawienie szeregu zmian i usprawnień oraz wskazówek odnośnie konfiguracji protokołów, jakie należy w tej warstwie zastosować aby zmaksymalizować jej wydajność głównie pod kątem oferowanej przepływności, wprowadzanych opóźnień oraz wsparcia priorytetów przesyłanego ruchu. Teza pracy...

  • Efficient methods for radio location service in cellular communication networks

    Publication

    - POLISH JOURNAL OF ENVIRONMENTAL STUDIES - Year 2007

    W artykule przedstawiono dwie oryginalne metody lokalizowania terminala ruchomego w sieciach komórkowych trzeciej generacji. Metody te podczas estymacji położenia terminala nie wymagają znajomości różnicy czasów w synchronizacji poszczególnych stacji bazowych, przez co są tanie w implementacji. Przedstawiono wyniki badań symulacyjnych zaproponowanych metod.