25 research outputs found

    Assessment of monthly rain fade in the equatorial region at C & KU-band using measat-3 satellite links

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    C & Ku-band satellite communication links are the most commonly used for equatorial satellite communication links. Severe rainfall rate in equatorial regions can cause a large rain attenuation in real compared to the prediction. ITU-R P. 618 standards are commonly used to predict satellite rain fade in designing satellite communication network. However, the prediction of ITU-R is still found to be inaccurate hence hinder a reliable operational satellite communication link in equatorial region. This paper aims to provide an accurate insight by assessment of the monthly C & Ku-band rain fade performance by collecting data from commercial earth stations using C band and Ku-band antenna with 11 m and 13 m diameter respectively. The antennas measure the C & Ku-band beacon signal from MEASAT-3 under equatorial rain conditions. The data is collected for one year in 2015. The monthly cumulative distribution function is developed based on the 1-year data. RMSE analysis is made by comparing the monthly measured data of C-band and Ku-band to the ITU-R predictions developed based on ITU-R’s P.618, P.837, P.838 and P.839 standards. The findings show that Ku-band produces an average of 25 RMSE value while the C-band rain attenuation produces an average of 2 RMSE value. Therefore, the ITU-R model still under predicts the rain attenuation in the equatorial region and this call for revisit of the fundamental quantity in determining the rain fade for rain attenuation to be re-evaluated

    Cilk : efficient multithreaded computing

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    Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1998.Includes bibliographical references (p. 170-179).by Keith H. Randall.Ph.D

    Workshop on Fuzzy Control Systems and Space Station Applications

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    The Workshop on Fuzzy Control Systems and Space Station Applications was held on 14-15 Nov. 1990. The workshop was co-sponsored by McDonnell Douglas Space Systems Company and NASA Ames Research Center. Proceedings of the workshop are presented

    Managing complexity in marketing:from a design Weltanschauung

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    Suffolk University Academic Catalog, College of Arts and Sciences and Sawyer Business School, 2021-2022

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    This catalog contains information for both the undergraduate and graduate programs in the College of Arts and Sciences and the Sawyer Business School.https://dc.suffolk.edu/cassbs-catalogs/1183/thumbnail.jp

    Suffolk University Academic Catalog and Student Handbook, College of Arts and Sciences and Sawyer Business School, 2020-2021

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    This catalog contains information for both the undergraduate and graduate programs. The student handbook is included here as a separate pdf document. Please contact the Archives if you need assistance navigating this catalog or finding information on policies, degree requirements, or course descriptions.https://dc.suffolk.edu/cassbs-catalogs/1182/thumbnail.jp

    Suffolk University Academic Catalog, College of Arts and Sciences and Sawyer Business School, 2022-2023

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    This catalog contains information for both the undergraduate and graduate programs in the College of Arts and Sciences and the Sawyer Business School.https://dc.suffolk.edu/cassbs-catalogs/1184/thumbnail.jp
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