Search results for: RECEIVING ANTENNAS , MIMO COMMUNICATION , TRANSMITTING ANTENNAS , ENCODING , DATA COMMUNICATION , BIT ERROR RATE , FADING CHANNELS

• Reliable OFDM Data Transmission with Pilot Tones and Error-Correction Coding in Shallow Underwater Acoustic Channel

  Publication

  • I. Kochańska

  - Applied Sciences-Basel - Year 2020

  The performance of Underwater Acoustic Communication (UAC) systems are strongly related to the specific propagation conditions of the underwater channel. Horizontal, shallow-water channels are characterised by extremely disadvantageous transmission properties, due to strong multipath propagation and refraction phenomena. The paper presents the results of communication tests performed during a shallow, inland-water experiment with...

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• Underwater Acoustic Communications in Time-Varying Dispersive Channels

  Publication

  • I. Kochańska
  • J. Schmidt
  • M. Rudnicki

  - Year 2016

  Underwater acoustic communication (UAC) system designers tend to transmit as much information as possible, per unit of time, at as low as possible error rate. However, the bit rate achieved in UAC systems is much lower than for wire or radio-communication systems. This is due to disadvantageous properties of the UAC channels, namely the sea and inland waters. Estimation of UAC channel transmission properties is possible within...

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• Performance Evaluation of GAM in Off-Body Path Loss Modelling for Body Area Networks

  Publication

  • M. Laskowski
  • S. J. Ambroziak
  • L. M. Correia
  • K. Świder

  - Year 2021

  This paper addresses the performance evaluation of an off-body path loss model, based on measurements at 2.45 GHz, which has been developed with the use of the Generalised Additive Model, allowing to model a non-linear dependence on different predictor variables. The model formulates path loss as a function of distance, antennas’ heights, antenna orientation angle and polarisation, results showing that performance is very sensitive...

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• On the Usefulness of the Generalised Additive Model for Mean Path Loss Estimation in Body Area Networks

  Publication

  • M. Laskowski
  • S. J. Ambroziak
  • L. M. Correia
  • K. Świder

  - IEEE Access - Year 2020

  In this article, the usefulness of the Generalised Additive Model for mean path loss estimation in Body Area Networks is investigated. The research concerns a narrow-band indoor off-body network operating at 2.45 GHz, being based on measurements performed with four different users. The mean path loss is modelled as a sum of four components that depend on path length, antenna orientation angle, absolute difference between transmitting...

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• System Loss Model for Body Area Networks in Room Scenarios

  Publication

  • M. M. Ferreira
  • F. D. Cardoso
  • S. J. Ambroziak
  • M. Särestöniemi
  • L. M. Correia

  - Year 2023

  This paper presents an analysis of system loss in Body Area Networks for room scenarios, based on a wideband measurement campaign at 5.8 GHz. The measurements were performed with a fixed antenna transmitting vertically and horizontally polarised signals, while the user wears dualpolarised antennas. The average system losses in co- and crosspolarised channels are 41.4 and 42.6 dB for vertically polarised transmitted signals and...

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• Radio Communication Antennas and MIMO Techniques (2023/24)

  e-Learning Courses

  • J. Magiera

  Course assigned to the following subject: - Radio Communication Antennas and MIMO Techniques (profile Radio Communication Systems and Networks [EN])

• Image transmission in UAV MIMO UWB-OSTBC system over Rayleigh channel using multiple description coding (MDC)

  Publication

  • A. Arshaghi
  • N. Razmjooy
  • V. V. Estrela
  • P. Burdziakowski
  • D. A. Nascimento
  • A. Deshpande
  • P. P. Patavardhan

  - Year 2020

  Orthogonal Space-Time Block Codes (OSTBC) and multiple-input-multiple-output (MIMO) communication system are new techniques with high performance that have many applications in wireless telecommunications. This chapter presents an image transfer technique for the unmanned aerial vehicle (UAV) in a UWB system using a hybrid structure of the MIMO-OSTBC wireless environment in multiple description coding (MDC) deals. MDC technique...

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• Karhunen-Loeve-based approach to tracking of rapidly fading wireless communication channels

  Publication

  • M. Niedźwiecki
  • A. Gańcza

  - SIGNAL PROCESSING - Year 2023

  When parameters of wireless communication channels vary at a fast rate, simple estimation algorithms, such as weighted least squares (WLS) or least mean squares (LMS) algorithms, cannot estimate them with the accuracy needed to secure the reliable operation of the underlying communication systems. In cases like this, the local basis function (LBF) estimation technique can be used instead, significantly increasing the achievable...

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• IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION

  Journals

  ISSN: 0018-926X , eISSN: 1558-2221

• 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...