Temat: WiMAX - Katalog OPAC zbiorów

Skocz do pozycji: 1.

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

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Skocz do pozycji: 2.

Tytuł:: A Sierpinski Carpet Five Band Antenna for Wireless Applications
Autorzy:: Khan, Imran
Devanagavi, Geetha D.
Sudhindra, K. R.
Vandana, K. M.
Pai M. M., Manohara
Ali, Tanweer
Powiązania:: https://bibliotekanauki.pl/articles/226982.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: sierpinski carpet
WiMAX
x-band
current distribution
Opis:: A compact Sierpinski Carpet square fractal multiband antenna operating at 3.9 (WiMAX) /6.6 (Satellite TV) /8.1/10.7/11.8 GHz (X-band) is presented. The proposed Microstrip Patch Antenna (MSPA) consists of a Sierpinski Carpet square fractal radiator in which square slots are etched out and a tapered microstrip feed line. The Sierpinski Carpet square fractal patch modifies the current resonant path thereby making the antenna to operate at five useful bands. Impedance matching at these bands are solely achieved by using Sierpinski square slot and tapered feedline, thus eliminating the need of any external matching circuit. The dimensions of the compact antenna is and exhibits S11<-10dB bandwidth of about 4.8% (4.01-3.82 GHz), 2.1% (6.62-6.48 GHz), 2.7% (8.24-8.02 GHz), 2.1% (10.77-10.54 GHz) and 21% (12.1-11.60 GHz) with the gain of 7.57/3.91/3.77/6.74/1.33 dB at the operating frequencies 3.9/6.6/8.1/10.7 and 11.8 GHz, respectively under simulation analysis carried out by using HFSS v.13.0.
Źródło:: International Journal of Electronics and Telecommunications; 2019, 65, 4; 551-556
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Performance Improvements in SNR of a Multipath Channel Using OFDM-MIMO
Autorzy:: Enoch, Sharmini
Otung, Ifiok
Powiązania:: https://bibliotekanauki.pl/articles/27311959.pdf
Data publikacji:: 2023
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:: WiMAX
fade mitigation
OFDM
MIMO
cyclic prefix
guard time
Opis:: The Non Line of Sight (NLOS) broadband wireless access provided by Worldwide Interoperability for Microwave Access (WiMAX) operating in 2-11 GHz frequency is susceptible to the effects of multipath propagation, diffraction fading, vegetation attenuation, shadowing loss etc. In order to overcome these effects effective fade mitigation techniques, have to be implemented. The Orthogonal Frequency Division Multiplexing- Multiple Input Multiple Output (OFDM-MIMO) is an efficient method that helps in combatting the fading and providing higher SNR to the WiMAX system. According to the IEEE 802.16 specification, for QPSK modulation, a threshold SNR of 6 dB is required for the link to operate. In the present work the use of OFDM-MIMO achieves a SNR above this operating threshold.
Źródło:: International Journal of Electronics and Telecommunications; 2023, 69, 4; 770--773
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Frequency Reconfigurable Split Ring Antenna for LTE And WiMAX Applications
Autorzy:: Madhav, B. T. P.
Nadh, B.
Anilkumar, T.
Pardhasaradhi, P.
Rao, M. C.
Lakshman, P.
Powiązania:: https://bibliotekanauki.pl/articles/226800.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: PIN diode
WiMAX
LTE 2500
split ring antenna
BAR64-02V
Opis:: This paper presents frequency reconfigurable dual band antenna for WiMAX and LTE 2500 band applications using four PIN diode switches. The antenna is compact in size with dimensions of 30 x 30 x 0.8 mm3 and designed on FR-4 dielectric substrate with a partial ground plane. The fabricated antenna operates in the frequency range of LTE and WiMAX (2.5-2.69 GHz and 3.4-3.6 GHz) respectively. The frequencies can be controlled by using PIN diodes and antenna attained the gain ranging of 3.34-4.46 dBi. This designed antenna resonating at 2.52 and 3.49 GHz when the PIN diodes are in ON state and resonating at 2.68 and 3.58 GHz when PIN diodes are in OFF state. The proposed antenna has bidirectional radiation at upper frequency bands and unidirectional at lower frequency bands. The proposed split ring structured antenna has the radiation efficiency of 94.12% at 2.52 GHz and 90.34% at 3.49 GHz in ON state. Antenna providing good agreement between the measured (Antenna measurement setup with VNA) and simulated results (Ansys-HFSS).
Źródło:: International Journal of Electronics and Telecommunications; 2020, 66, 2; 255-260
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

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