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Katedra Systemów i Sieci Radiokomunikacyjnych

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Katalog Publikacji

Rok 2019
Rok 2022
Rok 2021
  • A Method for Underwater Wireless Data Transmission in a Hydroacoustic Channel under NLOS Conditions
    Publikacja

    - SENSORS - Rok 2021

    Wireless data transmission in the hydroacoustic channel under non-line-of-sight (NLOS) propagation conditions, for example, during a wreck penetration, is difficult to implement reliably. This is mostly due to the multipath propagation, which causes a reduction in the quality of data reception. Therefore, in this work an attempt has been made to develop a reliable method of wireless underwater communication test it under the NLOS...

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  • A Wideband Channel Model for Body Area Networks in Circular Metallic Indoor Environments
    Publikacja

    - IEEE Access - Rok 2021

    In this paper, the wideband characterization of the propagation channel in circular metallic indoor environments is addressed, regarding Body Area Networks and 5G small cells, an analytical model for the dependence of the mean delay and the average delay spread on the circle radius, the working frequency and the distance between the transmitter and the receiver being proposed. The derivation of the model is initially done analytically,...

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  • Assessment of User Mobility’s Influence on System Loss in Several Body-to-Body Scenarios
    Publikacja

    - Rok 2021

    In this paper, Body-to-Body communications in indoor and outdoor environments for different on-body antenna configurations and different mobility scenarios were studied, based on system loss measurements at 2.45 GHz. The main objective is to properly characterise the influence of the Transmitter-Receiver configuration on system loss and fast fading behaviour, the latter being modelled by the Rice Distribution. Globally, it is observed...

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Rok 2009
  • A method of the UMTS-FDD network design based on universal load characteristics
    Publikacja

    - Rok 2009

    In the paper an original method of the UMTS radio network design was presented. The method is based on simple way of capacity-coverage trade-off estimation for WCDMA/FDD radio interface. This trade-off is estimated by using universal load characteristics and normalized coverage characteristics. The characteristics are useful for any propagation environment as well as for any service performance requirements. The practical applications...

  • Analiza efektywności metod estymacji położenia terminala ruchomego w środowisku propagacji wielodrogowej
    Publikacja

    - Rok 2009

    W referacie została zaprezentowana analiza efektywności metod estymacji położenia terminala ruchomego w systemie WCDMA/FDD (Wideband Code Division Multiple Access / Frequency Division Duplex) w warunkach propagacji wielodrogowej. Analizie poddano cztery, najczęściej spotykane w literaturze przedmiotu, metody: Chan'a, Foy'a, Fang'a oraz Friedlander'a. Metody te umożliwiają wyznaczanie położenia geograficznego termi-nala ruchomego...

  • Application of IR UWB Spectrum Shaping to IEEE 802.15.4a Standard

    Coexistence of existing narrowband systems and new ultra wideband devices in the same frequency range requires using some interference mitigation techniques, for example based on spectrum shaping. This paper presents efficiency of impulse radio spectrum shaping methods, applied to IEEE 802.15.4a UWB alternate physical layer signals. Basic parameters of 802.15.4a signal structure and outline of proposed spectrum shaping methods...

Rok 2018
Rok 2006
Rok 2024
  • A Selection of Starting Points for Iterative Position Estimation Algorithms Using Feedforward Neural Networks
    Publikacja

    This article proposes the use of a feedforward neural network (FNN) to select the starting point for the first iteration in well-known iterative location estimation algorithms, with the research objective of finding the minimum size of a neural network that allows iterative position estimation algorithms to converge in an example positioning network. The selected algorithms for iterative position estimation, the structure of the...

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  • A simplified channel estimation procedure for NB-IoT downlink
    Publikacja

    - Rok 2024

    This paper presents a low-complexity channel estimation procedure which is suitable for use in energy-efficient NB-IoT user equipment devices. The procedure is based on the well-established least squares scheme, followed by linear interpolation in the time domain and averaging in the frequency domain. The quality of channel estimation vs. signal-to-noise ratio is evaluated for two channel models and compared with the performance...

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