Wyniki wyszukiwania dla: RADIO KOGNITYWNE

• Efficiency of IEEE 802.15.4a UWB Impulse Radio Spectrum Shaping

  Publikacja

  • J. Sadowski
  • R. Katulski

  - Rok 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.

• Selective jamming of OFDM transmission in NB-IoT radio interface

  Publikacja

  • J. Magiera

  - Rok 2023

  The paper presents the concept of smart jamming, which involves selective interference aimed at critical components of the OFDM signal. Research verifying the feasibility of this type of electronic attack are described. A realized testbed for jamming real NB-IoT signals in a downlink is presented. The test results demonstrate the feasibility of realizing selective jamming and its greater effectiveness compared to barrage interference.

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• Performance analysis and optimization of the Radio Link Control layer in UMTS.

  Publikacja

  • P. Matusz
  • J. Woźniak

  - Rok 2004

  RLC (Radio Link Control) jest jedną z podwarstw warstwy 2 stosu radiowego systemu UMTS. RLC wspiera trzy podstawowe tryby działania: przezroczysty (Transparent Mode, TM), bezpotwierdzeniowy (Unacknowledged Mode, UM) oraz potwierdzeniowy (Acknowledged Mode, AM). Wydajność RLC AM jest mocno uzależniona od konfiguracji RLC oraz jej zdolności do dynamicznej rekonfiguracji, odzwierciedlającej zmiany w przesyłanym ruchu oraz w jakości...

• A History of Maritime Radio-Navigation Positioning Systems used in Poland

  Publikacja

  • C. Specht
  • A. Weintrit
  • M. Specht

  - JOURNAL OF NAVIGATION - Rok 2016

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• The Historical Journal of Film, Radio and Television

  Czasopisma

  ISSN: 0143-9685 , eISSN: 1465-3451

• Radio Electronics Computer Science Control

  Czasopisma

  ISSN: 1607-3274 , eISSN: 2313-688X

• Indian Journal of Radio and Space Physics

  Czasopisma

  ISSN: 0367-8393

• IEEE Journal of Radio Frequency Identification

  Czasopisma

  eISSN: 2469-7281

• Signals of the 5G Standalone Radio Interface

  Dane Badawcze

  open access

  • P. Rajchowski
  • J. Magiera
  • A. Czapiewska
  • S. Ambroziak
  • K. Cwalina
  • P. Skokowski
  • J. Kelner
  • K. Malon
  • K. Maślanka
  • M. Kryk

  - seria: 1.0

  The research work conducted within the scope of NATO-STO (North Atlantic Treaty Organization – Science and Technology Organization) IST-187 group assumed investigation of the 5G gNodeB performance. The downlink (DL) signals of the FDD (Frequency Division Duplex) 5G-Standalone station were registered in isolated and controlled laboratory conditions....

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

  Publikacja

  • S. J. Ambroziak
  • L. M. Correia
  • R. Katulski
  • M. Maćkowiak

  - Rok 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...

• Efficiency of the Use of LTE System Radio Resources in Highway Transport Enironment

  Publikacja

  • S. Gajewski

  - Archives of Transport System Telematics - Rok 2014

  The paper describes the problem of analysis of throughput-coverage characteristics of the LTE system. Simulation results of the efficiency of the use of LTE radio resources are presented. Simulation studies on the basis of original model of the LTE network simulator were carried out. In addition, the evaluation of throughput for a single connection, and available capacity were evaluated in the context of the use of the same...

• IEEE 802.15.4a Impulse Radio Spectrum Shaping by Changes in Pulse Sequence

  Publikacja

  • R. Katulski
  • J. Sadowski

  - Rok 2009

  This paper presents one of possible techniques of IEEE 802.15.4a ultra-wideband signal spectrum control, based on changes in sequences of transmitted pulses with very short duration time. This technique can reduce probability of mutual interferences between new ultra-wideband and existing narrowband devices, which may be helpful in further studies on allowing UWB transmission in wider range of spectrum in theEuropean Union.

• Capacity Estimation of the OFDMA and SC-FDMA Radio Interface for UMTS-LTE

  Publikacja

  • S. Gajewski

  - POLISH JOURNAL OF ENVIRONMENTAL STUDIES - Rok 2009

  In the paper a method of capacity estimation for the UMTS-LTE interface is presented. Both the OFDMA and SC-FDMA technology has been considered. A method of physical resource allocation for users is mentioned and analytical results of theoretical throuhput calculation are described.

• New method of IEEE 802.15.4a UWB Impulse Radio Spectrum Shaping

  Publikacja

  • J. Sadowski
  • R. Katulski

  - Rok 2011

  This paper presents a new technique of IEEE 802.15.4a ultra-wideband signal spectrum control, based on changes in sequences of transmitted pulses with very short duration time. Basic parameters of 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.

• Wideband Signal Generation for Jamming Radio-Controlled Improvised Explosive Devices

  Publikacja

  • J. Magiera

  - Rok 2018

  This paper focuses on modelling operation of a wideband jamming signal generator, considering the effects present in real device which influence the shape of transmitted signal’s spectrum. Introduction is followed by a brief overview of AEGIS project, aim of which is to develop a mobile generator of electromagnetic curtain. Next, simulation model is described which includes the factors...

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• Path Loss Measurements in Wideband Radio Link Designed for Maritime Environment

  Publikacja

  • P. Rajchowski
  • K. Cwalina
  • P. T. Kosz
  • J. Stefański
  • J. Sadowski

  - Rok 2018

  In the article, the research and analysis of path loss in designed and evaluated digital radio link for high-speed data transmission in maritime environment is presented. Collected samples of received signal were used to determine the mean path loss and its standard deviation. Measuring campaign was carried out in a real maritime conditions. The mean value of path loss reached 126 dB on a distance of 11.16 km.

• Position and Orientation Estimation in Radio Network With Groups of Locally Synchronized Nodes

  Publikacja

  • J. Sadowski
  • J. Stefański

  - IEEE Access - Rok 2023

  This article presents a positioning system with groups of locally synchronized nodes. A mobile object is equipped with a group of several synchronized receivers that are able to measure the difference in the time of arrival of signals from reference transmitters. The reference transmitters are synchronized only in local groups, with no global synchronization between groups. It is assumed that the synchronous operation of transmitters...

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• An Empirical Propagation Model for Mobile Radio Links in Container Terminal Environment

  Publikacja

  • S. J. Ambroziak
  • R. Katulski

  - IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY - Rok 2013

  In this paper, a novel empirical propagation model for mobile radio links in a container terminal environment is presented. Measurement propagation research carried out in the Deepwater Container Terminal (DCT) in Gdańsk, Poland is described, and the investigated environment is characterized. The results of the statistical evaluation of the new model are discussed. In addition, statistical tuning of the Walfisch–Ikegami model for...

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• Low Power Baseband Processor for M2M Reconfigurable Radio Test Platform

  Publikacja

  • K. Bizewski
  • Ł. Kulas
  • K. Nyka

  - Rok 2012

  Software Defined Radio (SDR) is becoming more andmore frequently used technique for wireless communication. Itfacilitates as fast prototyping and is a versatile method fordeveloping new communication systems. SDR can be realizedbased on high computational capacity platform, where powerconsumption is no a primary concern like i.e. DVB or BTStransmitters. Another trend are low power systems, whereavailable power in reduced and more...

• Measurements of High-Speed Data Transmission Radio Link for Special Applications

  Publikacja

  • P. T. Kosz
  • P. Rajchowski
  • K. Cwalina
  • J. Stefański
  • J. Sadowski

  - Rok 2017

  In the article measurements of high-speed data transmission radio link for special applications were presented. Build measurement stand, measurement scenario and obtained results were briefly described. All conducted research work took place in real maritime environment.

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

  Publikacja

  • P. T. Kosz
  • S. J. Ambroziak
  • L. M. Correia

  - Rok 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)...

• Empirical formulas for determination of the propagation loss in urban radio access links

  Publikacja

  • R. Katulski
  • A. Kiedrowski

  - Rok 2005

  Opisano wielowariantowy model empiryczny tłumienia propagacyjnego przeznaczonego do analizowaniai projektowania radiowych systemów dostępwych w warunkach zabudowy miejskiej, opracowanego na podstawie obszernych pomiarów tego tłumienia w rzeczywistych warunkach takiej zabudowy. Scharakteryzowano przydatność użytkową tego modelu.

• Implementacja odbiornika RAKE w technologii SDR (Software Defined Radio)

  Publikacja

  • R. Katulski
  • W. Siwicki
  • J. Stefański

  - Zeszyty Naukowe Wydziału ETI Politechniki Gdańskiej. Technologie Informacyjne - Rok 2010

  Różnorodność standardów systemów radiokomunikacyjnych, w tym telefonii komórkowej i bezprzewodowej, przy dużej ruchliwości ich abonentów, powoduje, że niezbędne jest skonstruowanie wielosystemowego terminala ruchomego, mającego techniczne możliwości współpracy z systemami radiokomunikacyjnymi działającymi w różnych standardach. W ten sposób zrodziła się idea radia definiowanego programowego SDR (Software Define Radio), bazująca...

• Universal software radio peripheral as a receiver and DSP platform for a passive radar

  Publikacja

  • B. Szlachetko
  • A. Lewandowski
  • G. Haza

  - Rok 2010

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• Spectrum Sensing Based on Hybrid Spectrum Handoff in Cognitive Radio Networks

  Publikacja

  • L. Vaduganathan
  • S. Neware
  • P. Falkowski-Gilski
  • P. B. Divakarachari

  - ENTROPY - Rok 2023

  The rapid advancement of wireless communication combined with insufficient spectrum exploitation opens the door for the expansion of novel wireless services. Cognitive radio network (CRN) technology makes it possible to periodically access the open spectrum bands, which in turn improves the effectiveness of CRNs. Spectrum sensing (SS), which allows unauthorized users to locate open spectrum bands, plays a fundamental part in CRNs....

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• Trendy rozwojowe technologii radia programowalnego.

  Publikacja

  • J. Stefański

  - Zeszyty Naukowe Wydziału ETI Politechniki Gdańskiej. Technologie Informacyjne - Rok 2004

  W referacie omówiono koncepcję technologii radia programowalnego, które w niedalekiej przyszłości zdominuje rynek usług radiokomunikacyjnych. Przedstawiono główne tendencje rozwojowe radia programowalnego oraz ograniczenia wynikające z praktycznej realizacji terminali ruchomych w tej technologii.

• Uwarunkowania teleinformatyczne technologii radia programowalnego. .

  Publikacja

  • R. Katulski
  • J. Stefański

  - Rok 2003

  Omówiono zagadnienie realizacji infrastruktury teleinformatycznej dla sieci radiokomunikacyjnej pracującej przy użyciu technologii radia programowalnego(software radio). Przedstawiono koncepcję tworzenia takiej technologii, która w przyszłości zdominuje rynek usług telekomunikacyjnych. Poruszono problem kosztów budowy i wdrożenia, co ostatecznie zadecyduje o sukcesie rynkowym tego przedsięwzięcia.

• Międzysystemowa kompatybilność elektromagnetyczna radia impulsowego

  Publikacja

  • R. Katulski
  • J. Sadowski

  - Zeszyty Naukowe Wydziału ETI Politechniki Gdańskiej. Technologie Informacyjne - Rok 2006

  W referacie przedstawiono uwarunkowania kompatybilnościowe transmisji ultraszerokopasmowej, z uwzględnieniem wymagań FCC (Federal Communications Commission). W szczególności scharakteryzowano system radia impulsowego oraz kształtowania widma częstotliwości zajmowanego przez transmisję impulsową.

• Performance analysis of data transmission in MC-CDMA radio interface with turbo codes

  Publikacja

  • A. Marczak

  - TELECOMMUNICATION SYSTEMS - Rok 2014

  Multi-carrier code division multiple access (MC-CDMA) technique is a combination of two radio access techniques: CDMA and orthogonal frequency division multiplexing and has the advantages of both techniques. The paper presents the design of transmitter and receiver for MC-CDMA radio interface. It also presents encoders and decoders of turbo codes which were used in simulation of the MC-CDMA technique. Two turbo codes with 8-state...

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• Tracking body movement for radio channel measurements in BAN with indoor positioning system

  Publikacja

  • J. Sadowski
  • P. Rajchowski
  • K. Cwalina

  - Rok 2016

  This paper presents indoor positioning system based on inertial navigation with additional distance measurements using UWB modems and map matching to increase accuracy and eliminate position drift. Such system may be used to track position of human body during radio channel measurements for body area networks. Performance of proposed system and limitations caused by inertial navigation are briefly described.

• Narrowband Transmission Quality in Presence of Modified IEEE 802.15.4a Impulse Radio Interference

  Publikacja

  • J. Sadowski

  - Rok 2011

  This paper presents results of measurement of narrowband transmission quality in presence of impulse radio UWB interference. IEEE 802.15.4a UWB signal is being used as interferer, also with frame structure modifications which lead to change spectrum of the interference. Equations and coefficients which allow to calculate ratio between power of useful and interference signal are also presented.

• Person Tracking in a Ferry Environment Using Ultra-Wide Band Radio Interface

  Publikacja

  • P. Rajchowski
  • K. Cwalina
  • J. Sadowski

  - Rok 2019

  This article presents research and analysis of effectiveness of tracking moving people in an environment of passenger ferry, using measurements of propagation time of ultra-wide band radio signal (UWB - Ultra-Wide Band). Constructed measurement stand and results of measurements carried out in a real propagation conditions were shortly discussed.

• Validation of a virtual test environment for C2X communication under radio jamming conditions

  Publikacja

  • M. Tarkowski
  • M. Rzymowski
  • Ł. Kulas
  • K. Nyka
  • M. Borawski
  • P. Kwapisiewicz
  • W. Piechowski
  • G. Temme
  • S. Khan
  • D. Behnecke
  • M. Mahmod

  - Rok 2019

  In this paper, we propose a novel car-2-x communication security testing methodology in the physical layer of wireless systems. The approach is dedicated to automated testing of autonomous vehicles and it is essential for such complex systems operation, especially with regard to safety and security issues. It is based on scenario-driven testing in virtual and real test environments created from collected or simulated data. The...

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• Velocity measurement using the fdoa method in ground-based radio navigation system

  Publikacja

  • J. Sadowski

  - Metrology and Measurement Systems - Rok 2014

  Velocity is one of the main navigation parameters of the moving objects. However some systems of position estimation using radio wave measurements cannot provide velocity data due to limitation of their performance. In this paper a velocity measurement method for DS-CDMA radio navigation system is proposed, which doesn’t require full synchronization of reference stations carrier frequencies. The article presents basics of FDOA...

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• Influence of a Radio Frequency on RF Fingerprinting Accuracy Based on Ray Tracing Simulation

  Publikacja

  • P. Woźnica
  • Ł. Kulas

  - Rok 2013

  In this paper the influence of a radio signal frequency on performance of Indoor Positioning System based on fingerprinting has been examined using ray-tracing simulations. It has been simulated how spatial distribution of an RF signal strength change with the signal’s frequency. The results were used to show its’ impact on the behavior of localization algorithms that are employing RSS measurements to determine node’s position...

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

  Publikacja

  • S. J. Ambroziak
  • R. Katulski
  • L. M. Correia
  • M. Maćkowiak

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

  Publikacja

  • K. Cwalina
  • S. J. Ambroziak
  • P. Rajchowski
  • L. M. Correia

  - Rok 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...

• LTE and NB-IoT Performance Estimation Based on Indicators Measured by the Radio Module

  Publikacja

  • R. Burczyk
  • A. Czapiewska
  • M. Gajewska
  • S. Gajewski

  - Electronics - Rok 2022

  Monitoring the operating parameters of power grids is extremely important for their proper functioning as well as for ensuring the security of the entire infrastructure. As the idea of the Internet of Things becomes more ubiquitous, there are tools for monitoring the state of the complex electrical grid and means to control it. There are also developed new measuring devices and transmission technologies allowing for the transfer...

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• Estimation of transmission quality in cellular systems based on indicators measured by the radio module

  Publikacja

  • O. Błaszkiewicz
  • R. Burczyk
  • A. Czapiewska
  • M. Gajewska
  • S. Gajewski
  • J. Sadowski

  - Rok 2022

  The article presents a measurement stand for testing transmission quality in cellular systems such as LTE, NB-IoT, UMTS and GSM. The results of BLER and throughput measurements for various propagation conditions as well as results of quality indicators appropriate for mentioned technologies measured by commercial radio module are presented. Those measurements were utilized to analyze the possibility of estimating the transmission...

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• Compatible DC and small-signal MOSFET models for radio and microwave frequency simulation

  Publikacja

  • W. Kordalski
  • T. Stefański

  - Rok 2005

  Zaprezentowano nowy model stałoprądowy tranzystora MOS i kompatybilny z nim uogólniony nie-quasi-statyczny model małosygnałowy. Model stałoprądowy został eksperymentalnie zweryfikowany dla tranzystorów MOS o długości kanału od 75 nm do kilkunastu mikrometrów, a model małosygnałowy od zera herców do 30 GHz.

• Validation of a virtual test environment for C2X communication under radio jamming conditions

  Publikacja

  • M. Tarkowski
  • M. Rzymowski
  • Ł. Kulas
  • K. Nyka
  • M. Borawski
  • P. Kwapisiewicz
  • W. Piechowski
  • G. Temme
  • S. Khan
  • D. Behnecke
  • M. Mahmod

  - Rok 2020

  In this paper, we propose a novel car-2-x communication security testing methodology in the physical layer of wireless systems. The approach is dedicated to automated testing of autonomous vehicles and it is essential for such complex systems operation, especially with regard to safety and security issues. It is based on scenario-driven testing in virtual and real test environments created from collected or simulated data. The...

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• Radio-photoluminescence of highly irradiated Lif:Mg,Ti and Lif:Mg,Cu,P detectors

  Publikacja

  • A. Mrozik
  • P. Bilski
  • B. Marczewska
  • B. Obryk
  • K. Hodyr
  • W. Gieszczyk

  - RADIATION MEASUREMENTS - Rok 2014

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• Reception of Terrestrial DAB+ and FM Radio with a Mobile Device: A Subjective Quality Evaluation

  Publikacja

  • P. Falkowski-Gilski

  - Rok 2023

  Nowadays, terrestrial broadcasting enables to receive content anytime and everywhere. People can obtain information both with a portable or desktop receiver, which include pocket-sized devices as well as high-end Hi-Fi equipment, not to mention car audio systems. Numerous manufacturers include FM-compatible chipsets in a variety of user equipment (UE), including mobile phones. However, digital radio signal processing modules, such...

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• Audio Content and Crowdsourcing: A Subjective Quality Evaluation of Radio Programs Streamed Online

  Publikacja

  • P. Falkowski-Gilski

  - Rok 2023

  Radio broadcasting has been present in our lives for over 100 years. The transmission of speech and music signals accompanies us from an early age. Broadcasts provide the latest information from home and abroad. They also shape musical tastes and allow many artists to share their creativity. Modern distribution involves transmission over a number of terrestrial systems. The most popular are analog FM (Frequency Modulation) and...

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• Software defined HF data modem

  Publikacja

  • K. Bronk
  • J. Stefański

  - Zeszyty Naukowe Akademii Marynarki Wojennej - Rok 2007

  W artykule przedstawiono koncepcję budowy modemu krótkofalowego, opartego na technologii radia programowego. Zaproponowano rozwiązanie warstwy sprzętowej i programowej modemu, które zostało zweryfikowane na drodze pomiarowej w warunkach laboratoryjnych.

• DS-CDMA receiver in Software Defined Radio technology. Admission to the implementation of a RAKE receiver

  Publikacja

  • W. Siwicki
  • J. Stefański

  - Rok 2010

  Programmable radio is one of the latest trends in the construction of multi-standard receivers. The technology, called Software Defined Radio (SDR), is also an ideal test platform that allows to try out different algorithms of signal receiving. This particular feature led to choose this platform to implement a DS-CDMA receiver (Direct Sequence Code Division Multiple Access). The use of SDR allows for a gradual upgrade of data processing...

• Multi-channel radio-over-fiber communication systems through modulation instability phenomenon

  Publikacja

  • R. Azizpour
  • H. Zakeri
  • G. Moradi
  • M. Alibakhshikenari
  • F. Falcone
  • L. Bo
  • T. Dendini
  • I. Park
  • S. Kozieł
  • E. Limiti

  - IEEE Photonics Journal - Rok 2024

  Recent advancements in Radio-over-Fiber (RoF) technology have positioned it as a promising solution for highcapacity wireless communications. This paper explores novel applications of RoF systems in enhancing phased array antenna (PAA) performance for multi-channel wireless communication applications through the modulation instability (MI) phenomenon. Utilizing fibers experiencing MI with varying group velocity dispersions (β2)...

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• Research and Analysis of High-Speed Data Transmission Radio Link Designed for Maritime Environment

  Publikacja

  • P. Rajchowski
  • K. Cwalina
  • P. T. Kosz
  • J. Stefański
  • J. Sadowski

  - Rok 2017

  In these article, the realization of digital radio link for high-speed data transmission was presented. Its concept and practical realization, using USRP devices from National Instruments, were described. Developed software for generation and reception of digital signals in baseband, including description of modulation types, and time and frequency synchronization mechanisms, was presented. Moreover, an operation of designed radio...

• Research and analysis of high-speed data transmission radio link designed for maritime environment

  Publikacja

  • P. T. Kosz
  • P. Rajchowski
  • K. Cwalina
  • J. Sadowski
  • J. Stefański

  - Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne - Rok 2017

  In these article the realization of digital radio link for high-speed data transmission was presented. Its concept and practical realization, using USRP devices from National Instruments, were described. Developed software for generation and reception of digital signals in baseband, including description of modulation types, and time and frequency synchronization mechanisms, was presented. Moreover, an operation of designed radio...

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• Perspectives of Transport Systems Development in the Light of Radio Communication Systems Evolution Towards 5G

  Publikacja

  • S. Gajewski

  - Rok 2017

  In the paper conditions of development and implementation of transport systems with reference to the development of radio communication networks towards 5G are presented. First, general properties of next generation systems are mentioned and their architecture. Moreover, planned characteristics of B4G and 5G systems are depicted which can significantly contribute to the promotion and development of transport systems. In particular...

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