Temat: OAM - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Mobile MPLS-TP : Support the mobility of terminal devices using OAM channel
Autorzy:: Pijanka, M. M.
Różański, G. W.
Powiązania:: https://bibliotekanauki.pl/articles/227042.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: telecommunications
network protocols
NGN
MPLS
OAM
mobility management
handoff
Opis:: MPLS architecture for transport networks play the significant role in the development of next generation networks, in particular with regard to the guarantee of continuity of communications "end-to-end" through a variety of heterogeneous segments of the telecommunications network. The article presents the concept of Mobile MPLS-TP with the use of OAM channels to support the mobility of users and optimize "Handoff" procedure in a hierarchical network topology.
Źródło:: International Journal of Electronics and Telecommunications; 2016, 62, 3; 215-223
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Improved Prediction of Polar Motions by Piecewise Parameterization
Autorzy:: Wu, Yuanwei
Zhao, Xin
Yang, Xinyu
Powiązania:: https://bibliotekanauki.pl/articles/2174948.pdf
Data publikacji:: 2022
Wydawca:: Polska Akademia Nauk. Centrum Badań Kosmicznych PAN
Tematy:: earth rotation prediction
effective angular momentum functions
AAM
OAM
Opis:: Natioinal Time Service Center of Chinese Academy of Sciences, Lintong, Shaanxi, China e-mail: yuanwei.wu@ntsc.ac.cn ABSTRACT. On seanonal timescale, the variation of Earth rotation is mainly regulated by angular momentum exchanges between the solid Earth and the fluidal atmosphere, ocean and hydrosphere. In the 2nd EOP PCC, we developed Dill2019’s method for polar motion prediction, using piecewise autoagressive parameters. The maximum prediction errors within 90 days are 36 and 16 mas for polar motion x and y components, respectively. Compared with Bulletin A, the mean absolute error of polar motion y prediction is improved by 20% in all timescale, and with a maximum improvement of 49% on the 5th day. Whereas, for polar motion x, the performance is slightly better (2% - 8%) within 30 days but worse (−7%∼ −19%) within 30∼90 days. We found that the prediction accuracy is very sensitive to the quality of the angular momentum data. For example, on average, the prediction of polar motion y is around 2 times better than polar motion x. In addition, we found the accuracy of 30-90 days prediction is dramatically decreased in the year 2020. We suspect that such deterioration might be due to the pandemic of coronavirus COVID-19, which suppressed global airline activities by more than 60%, then result in a lose of air-borne meteorological data, which are important for weather forecast.
Źródło:: Artificial Satellites. Journal of Planetary Geodesy; 2022, 57, Special Issue 1; 290--299
2083-6104
Pojawia się w:: Artificial Satellites. Journal of Planetary Geodesy
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Evaluation of a high-speed hybrid OAM-OFDM-MDM multiplexed coherent FSO system under desert conditions
Autorzy:: Sinha, Shivaji
Kumar, Chakresh
Powiązania:: https://bibliotekanauki.pl/articles/27310107.pdf
Data publikacji:: 2023
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: atmospheric attenuation
bit error rate
BER
orbital angular momentum
OAM
optical signal-to-noise ratio
OSNR
orthogonal frequency division multiplexing
OFDM
quadrature amplitude modulation
QAM
transmission range
Opis:: To meet the needs of future wireless optical networks, this paper introduces a high-speed, hybrid multiplexed, coherent free-space optical (FSO) communication system that integrates an orbital angular momentum (OAM) multiplexed signal with an orthogonal frequency division multiplexing (OFDM) technique. Two independent QAM polarized beams, each carrying in-phase and quadrature (I/Q) phase 16-QAM-OFDM modulated data, are combined using mode division multiplexing (MDM) to increase the capacity of the proposed system. The reason of choosing OFDM is its capability to support higher data rate, and mitigating intersymbol interference (ISI). The signal is detected using a coherent detection-based digital signal processing (DSP) algorithm at the receiver end. The proposed hybrid FSO system is evaluated in low and heavy dust environments using bit error rate (BER), link distance, optical signal-to-noise ratio (OSNR), and received optical power performance matrices. The simulation results demonstrate the successful transmission of a 120 Gb/s single carrier over the longest link ranges of 1.5 and 0.40 km, respectively, under low and heavy dust weather environments below the signal degradation threshold value (forward error correction (FEC) limit) of BER 2.2 × 10–3 in strong turbulent conditions.
Źródło:: Optica Applicata; 2023, 53, 3; 431--445
0078-5466
1899-7015
Pojawia się w:: Optica Applicata
Dostawca treści:: Biblioteka Nauki

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