Wyniki wyszukiwania dla: CHANNEL IMPULSE RESPONSE, PROPAGATION IN ISM 2.4 GHZ BAND

• Selected properties and parameters of radio channel impulse response estimation in ISM 2.4 GHz band

  Publikacja

  • A. Czapiewska
  • R. Studanski,

  - Proceedings of SPIE - Rok 2019

  The article presents experimental research indicating that the impulse response of the communication channel, determined in practice, are not of an universal character, but only represent its approximate value for the frequency on which this measurement was made. Phases for each of the replicas of the measurement signal were determined during the analysis of the received signals in the baseband. Phase changes of individual replicas...

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• Channel Impulse Response Measurements at mmWave Band in Office and Conference Rooms

  Publikacja

  • M. Drozdowska
  • S. J. Ambroziak
  • K. Cwalina
  • P. Rajchowski
  • N. Cardona

  - Rok 2023

  In this paper, the measurements of the channel impulse response at mmWave band in office and conference rooms are described. The central frequency is 27 GHz with a bandwidth of 400 MHz. The description of the used measurement stand and considered environments are presented. The initial analysis of the power delay profile, mean delay, and RMS delay spread allows preliminary conclusions to be drawn that there is a significant impact...

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• Krzysztof Jamroziak Prof. dr hab. inż.

  Osoby

  Krzysztof Jamroziak is Full Professor of the Wroclaw University of Scinece and Technology in Department Mechanic, Materials and Biomedical Engineering. His interests relate to composite materials, mechanical properties, ballistic impact, ballistic shields, nonlinear dynamics, strength of composite materials. Attention is focused on research on innovative composite structures subjected to impact loads, physico-mechanical properties...

• ADAPTIVE IDENTIFICATION OF TIME-VARYING IMPULSE RESPONSE OF UNDERWATER ACOUSTIC COMMUNICATION CHANNEL

  Publikacja

  • I. Kochańska

  - HYDROACOUSTICS - Rok 2015

  The transmission properties of underwater acoustic communication channel can change dynamically due to the movement of acoustic system transmitter and receiver or underwater objects reflecting transmitted signal. The time-varying impulse response measurement and estimation are necessary to match the physical layer of data transmission to instantaneous channel propagation conditions. Using the correlative measurement method, impulse...

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• Measurement of Impulse Response of Shallow Water Communication Channel by Correlation Method

  Publikacja

  • J. Schmidt
  • I. Kochańska
  • A. Schmidt

  - HYDROACOUSTICS - Rok 2017

  Performances of underwater acoustic communication (UAC) systems are strongly related to specific propagation conditions of the underwater channel; conditions that can additionally change in time due to the movement of the acoustic system transmitter and receiver or to reflection by underwater objects of the transmitted signal. The time-varying impulse response is a comprehensive description of dynamically changing transmission...

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• 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)...

• Dual-band antenna with improved gain for WLAN and ISM applications

  Publikacja

  • A. Bekasiewicz
  • S. Kozieł

  - ELECTRONICS LETTERS - Rok 2019

  In this Letter, a dual-band antenna with an improved gain is proposed. The structure features 9.7 and 10.4 dBi gain within 2.4 GHz to 2.5 GHz and 5 GHz to 6 GHz bands, respectively. This makes it suitable for WLAN and ISM applications. The structure comprises an asymmetrical pair of radiators and slots suspended over a reflector. The antenna is optimised in a two-stage process using a trust-region-based gradient search algorithm....

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• A system for Direction-Of-Arrival estimation in ISM 2.4 GHz frequency band based on ESPAR antenna and SDR technology

  Publikacja

  • P. Kwapisiewicz

  - Rok 2018

  Determination of the direction of the signal arrival (DOA) finds many applications in various areas of science and industry. Knowledge of DOA is used, among others to determine the position of a satellite with a low Earth orbit (LEO), localization of people and things as well as in research of wireless communication systems, for instance the determination of the number of...

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• Application of Maximum-Length Sequences to impulse response measurement of hydroacoustic communications systems

  Publikacja

  • R. Mazurek
  • H. Lasota

  - HYDROACOUSTICS - Rok 2007

  There is a growing interest in digital transmission of telemetry data on ultrasonic waves. The dependence of signal attenuation on squared frequency, specific to the hy-droacoustic systems, induces problems that do not exist in monochromatic, narrowband radio communications systems. For adapting the transmission parameters to current propagation conditions, a precise knowledge of instantaneous changes of channel performances is...

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• Embedded device for indoor positioning of mobile terminals in ISM 2.4 GHz frequency band integrated with ESPAR antenna

  Publikacja

  • T. Dryjański

  - Rok 2018

  In the era of multifunctional mobile phones, wireless positioning is one of the most important branches of telecommunications development. This functionality is possible thanks to global positioning systems such as GPS, whose services are available to every average user. Global systems, however, suffer from their low accuracy in confined environments such as forests and building interiors. A popular...

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