Autor: Zielinski, R. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Frequency Dependent Mismatch Correction Scheme for Zero-IF Receivers
Autorzy:: Hibner, R.
Zieliński, R. J.
Powiązania:: https://bibliotekanauki.pl/articles/226210.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: zero-IF
ZIF
compensation
quadrature
IQ
wideband
dynamic range
image correction
Opis:: This paper shows effective method of linear distortions compensation in zero-IF receivers. With application of frequency domain processing a computation efficient method was developed that allows to correct quadrature mismatch in Zero-IF receiver along with gain and group delay independent of receiving signal type. Method was implemented and tested on hardware platform confirming its effectiveness. This method makes it possible to build high sensitivity devices to monitor spectrum in very wide frequency ranges.
Źródło:: International Journal of Electronics and Telecommunications; 2018, 64, 1; 13-18
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Measurement of Special Shielding Materials at S and C Band Using Improved Free-Space Transmission Technique
Autorzy:: Dvurechenskaya, N.
Zieliński, R. J.
Powiązania:: https://bibliotekanauki.pl/articles/226270.pdf
Data publikacji:: 2011
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: nonwoven
fabric
shielding effectiveness
freespace measurements
surface resistivity
Opis:: In this paper we discuss state of the art in the field of shielding materials investigation. Two types of newly manufactured shielding materials (nonwoven and fabric) were measured using improved free-space transmission technique at 2-5 GHz depending on electromagnetic wave (EM) polarization and antenna to specimen distance. Results of shielding effectiveness (SE) evaluation based on measured complex transmission coefficients (S21) were presented and compared with SE measured using coaxial transmission line technique. Also results of surface resistance measurements with the four-probe technique for the test materials are shown.
Źródło:: International Journal of Electronics and Telecommunications; 2011, 57, 3; 329-334
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: High Altitude Platform : Future of Infrastructure
Autorzy:: Malinowski, A.
Zieliński, R. J.
Powiązania:: https://bibliotekanauki.pl/articles/226948.pdf
Data publikacji:: 2010
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: HAP
High Altitude Platform
rural area
infrastructure
Opis:: High Altitude Platform (HAP) concept and idea is presented in the article. Characteristics, advantages and disadvantages of HAPs are described. There is also the comparison available between HAPs and existing telecommunication infrastructure (terrestrial and satellite). Selected examples of the possible limitation and technological restrictions of HAP based systems are presented in the article.
Źródło:: International Journal of Electronics and Telecommunications; 2010, 56, 2; 191-196
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 4.

Tytuł:: A Simulation Model of the Radio Frequency MIMO-OFDM System
Autorzy:: Kowal, M.
Kubal, S.
Piotrowski, P.
Zieliński, R. J.
Powiązania:: https://bibliotekanauki.pl/articles/226276.pdf
Data publikacji:: 2011
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: MIMO-OFDM
Simulink
simulator
Opis:: The paper presents a simulation model of the radio frequency MIMO-OFDM system. The simulation model was made in Matlab Simulink environment. It contains the transmitter, the receiver and the telecommunication channel models. The telecommunication channel model consists of models used during development of technical documentation of IEEE 802.11n. Signals generated at the transmitter output are fully compatible with signals described in IEEE 802.11n [1]. Simulations are conducted on a radio frequency, so they can be compared with results of measurements of real systems.
Źródło:: International Journal of Electronics and Telecommunications; 2011, 57, 3; 323-328
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 5.

Tytuł:: Operational characteristic of wireless WiMax and IEEE 802.11x systems in underground mine environments
Autorzy:: Kowal, M.
Kubal, S.
Piotrowski, P.
Zieliński, R. J.
Powiązania:: https://bibliotekanauki.pl/articles/227021.pdf
Data publikacji:: 2010
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: WLAN
WiMAX
throughput
delay
mine environment
Opis:: 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.
Źródło:: International Journal of Electronics and Telecommunications; 2010, 56, 1; 81-86
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 6.

Tytuł:: Measurements of shielding effectiveness of textile materials containing metal by the free-space transmission technique with data processing in the time domain
Autorzy:: Dvurechenskaya, N.
Bajurko, P. R.
Zieliński, R. J.
Yashchyshyn, Y.
Powiązania:: https://bibliotekanauki.pl/articles/221789.pdf
Data publikacji:: 2013
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: textiles
shielding effectiveness
free-space transmission technique
time-domain gating
Opis:: 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.
Źródło:: Metrology and Measurement Systems; 2013, 20, 2; 217-228
0860-8229
Pojawia się w:: Metrology and Measurement Systems
Dostawca treści:: Biblioteka Nauki

Artykuł

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