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Number of results: 7
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Abstract

Operational characteristic of wireless WiMax and IEEE 802.11x systems in underground mine environments The paper presents research results pertaining to transmission parameters of wireless communication systems, based on WiMax and IEEE 802.11x radio interfaces. Research was performed in severe operating conditions of an underground mine - testing various parameters, such as: throughput, delays and maximum range.
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Authors and Affiliations

Michał Kowal
Sławomir Kubal
Piotr Piotrowski
Ryszard Zieliński
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Abstract

The results of shielding effectiveness (SE) measurements of textile materials containing metal by the free-space transmission technique (FSTT) in the 1-26.5 GHz frequency range are presented in the paper. It is shown that experimental data processing using time-domain gating (TDG) makes it possible to effectively remove diffracted and reflected components from the desired signal. The comparison with the results obtained by other techniques, namely modified FSTT with TDG and coaxial line probe technique (ASTM D4935-99) is given. The comparison shows that the proposed technique gives more reasonable results while the measurement set-up is simpler in realization.

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Authors and Affiliations

Nadezhda Dvurechenskaya
Paweł R. Bajurko
Ryszard J. Zieliński
Yevhen Yashchyshyn
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Abstract

The article presents the methodology for measuring verification of the phenomenon of fades in the DAB+ SFN. The verification is related to comparing the characteristics of the fades determined theoretically with the occurring fades in the real environment of a large city. The conditions favorable for the occurrence of fading are presented and by selecting the appropriate propagation analysis tool, the places where the occurrence of fading is most likely were selected. In these places an analysis of the characteristics of fades was carried out and the conditions for their verification were determined.
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Bibliography

[1] WorldDAB, „WorldDAB infographic (Q2 2019)”, https://www.worlddab.org/resources/infographic. (29 03 2020).
[2] S. Kubal, M. Kowal, P. Piotrowski, K. Staniec, “Optimal Transmission Technique for DAB+ Operating in the SFN Network”, in Springer Nature Switzerland, Theory and Applications of Dependable Computer Systems, Proceedings of the Fifteenth International Conference on Dependability of Computer Systems DepCoS-RELCOMEX, June 29 – July 3, 2020, Brunów, Poland.
[3] European Telecommunications Standards Institute, EN 300 401 V2.1.1 Draft ETSI EN 300 401 V2.1.1 Radio Broadcasting Systems; Digital Audio Broadcasting (DAB) to mobile, portable and fixed receivers, 2016.
[4] European Broadcasting Union, „TR 24 SFN Frequency planning and network implementation with regard to T-DAB and DVB-T,” Genewa, 2013.
[5] R. Zieliński, “Fade analysis in DAB+ SFN network in Wroclaw”, Proc. of the 2019 International Symposium on Electromagnetic Compatibility (EMC Europe 2019), Barcelona, Spain, September 2– 6, 2019, (978-1-7281-0594-9/19/$31.00 © 2019 IEEE).
[6] D. Plebs, J. Wout., P. Angueira, J.A. Arenas, L. Verloock, L. Martens,: “On the Methodology for Calculating SFN Gain in Digital Broadcast Systems”, IEEE Transactions on Broadcasting, Vol. 56, No. 3, September 2010, pp.331-339
[7] K. Staniec, S. Kubal, M. Kowal, P. Piotrowski,: “On the Influence of the Coding Rate and SFN Gain on DAB+ Coverage”, Advances in Intelligent Systems and Computing, 2020.
[8] P. Gilski, J. Stefanski, “Subjective and Objective Comparative Study of DAB+ Broadcast System”, Archives of Acoustics, Vol. 42, No. 1, pp. 3–11 (2017), by PAN – IPPT)
[9] S. Brachmański, M. Kin, “Assessment of speech quality in Digital Audio Broadcasting (DAB+) system”, AES 134th Convention, Rome, Italy, 2013.
[10] M. Kin, “Subjective evaluation of sound quality of musical recordings transmitted via DAB+ system", in Proc. 134th Audio Engineering Society Convention, Rome, Italy, 2013, pp. 1231{2366.
[11] P. Gilski., J. Stefanski, “Digital Audio Broadcasting or Webcasting: A Network Quality Perspective”, Journal of Telecommunications and Information Technology, 1, 9–15, 2016.
[12] P. Pocta, J.G. Beerends, “Subjective and Objective Assessment of Perceived Audio Quality of Current Digital Audio Broadcasting Systems and WebCasting Applications”, IEEE Transactions on Broadcasting, 61, 407–415, 2015.
[13] International Telecommunication Union, ITU-R BS.2214-3, “Planning parameters for terrestrial digital sound broadcasting systems in VHF bands”, 2019.
[14] European Broadcasting Union, TECH 3391, “Guidelines for DAB network planning”, Genewa, 2018.
[15] National Institut of Telecommunications, „LokalDAB,”. https://www.il-pib.pl/pl/projekty-krajowe/projekty-krajowe-ze-srodkow-na-nauke/projekt-localdab, (25 05 2020).
[16] Radio Polska, „MUX LokalDAB,”. http://radiopolska.pl/wykaz/mux/145. (2020 05 25).
[17] European Broadcasting Union, TR 016, “Benefits and Limitations of Single Frequency Networks (SFN) for DTT”, 2012.
[18] A. Tissen, A. Waal, F. Maier, “Evaluations and Measurements of a Single Frequency Network with DRM+”, European Wireless Conference, Poznan, 2012.
[19] R. Zieliński, “Conditions for obtaining correct DAB+ signal reception on a single frequency network” (in polish), Przegląd Telekomunikacyjny i Wiadomości Telekomunikacyjne, nr. 6, 2017, str. 509-512.
[20] R. Zieliński, “Analysis of depth of fades in a single frequency DAB+ network on the example of the network in Wroclaw” (in polish), Przegląd Telekomunikacyjny i Wiadomości Telekomunikacyjne, nr. 6, 2018, str. 320-325
[21] R. Zieliński, “Distribution of fade area in a SFN network on the example of the DAB+ network” (in polish), Przegląd Telekomunikacyjny i Wiadomości Telekomunikacyjne, nr. 8-9, 2018, str. 581-584.
[22] R. Zieliński, “Analysis of the phenomenon of fades in the SFN DAB+ network with three transmitters on the example of the network in Wroclaw” (in polish),. Przegląd Telekomunikacyjny i Wiadomości Telekomunikacyjne, nr. 6, 2019, str. 386-391.
[23] R. Zieliński, “Analysis and Comparision of the Fade Phenomenon in the SFN DAB+ Network With Two and Three Transmitters”, Intl Journal of Electronics and Telecommunications, 2020, Vol. 66, No. 1, str.. 85-92.
[24] International Telecommunication Union, Recommendation ITU-R P.1546-5 : “Method for point-to-area predictions for terrestrial services in the frequency range 30 MHz to 3 000 MHz”, 2013.
[25] I. Michalski, thesis, "Analysis of the distribution of e-m field strength and fades from the SFN DAB+ network in Wroclaw”, Wroclaw University of Science and Technology, 2020.
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Authors and Affiliations

Igor Michalski
1
ORCID: ORCID
Ryszard J. Zielinski
2
ORCID: ORCID

  1. National Institute of Telecommunications, Poland
  2. Wroclaw University ofScience and Technology, Poland

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