2 edition of Adaptive cancellation of cross-polarization on satellite microwave links. found in the catalog.
Adaptive cancellation of cross-polarization on satellite microwave links.
Mazin Shakir Mahmoud
Written in English
|Series||Theses / University of Bradford Postgraduate School of Studies in Electrical and Electronic Engineering|
|The Physical Object|
|Number of Pages||126|
CableFree Microwave links are are available in licensed bands (GHz) as well as unlicensed 5, 17, 24GHz. CableFree High Performance Licensed Microwave Radios offer up to Mbps and Mbps Full Duplex payload (Gbps aggregate capacity) and higher up to 3Gbps or more, with a software-selectable mix of SDH, PDH and IP/Ethernet traffic in. ment with the satellite’s signals. A circular feed horn does not have this requirement. Advantages of Circular Polarization There are several key advantages for circular polarization over linear polarization, which make it more appealing: The Faraday effect The Faraday effect deals with the interaction between light and magnetic Size: KB.
This is a quick video demonstrating cross polarization loss with linear and circular antennas. Marc (FPV Goose) came up with this test set up . Cross-polarization is radiation orthogonal to the desired polarization. For instance, the cross-polarization of a vertically polarized antenna is the horizontally polarized fields.
Polarization-division multiplexing is a physical layer method for multiplexing signals carried on electromagnetic waves, allowing two channels of information to be transmitted on the same carrier frequency by using waves of two orthogonal polarization states. It is used in microwave links such as satellite television downlinks to double the bandwidth by using two orthogonally polarized feed antennas in satellite dishes. Cross polarization (sometimes written X-pol, in antenna slang) is the polarization orthogonal to the polarization being discussed. For instance, if the fields from an antenna are meant to be horizontally polarized, the cross-polarization in this case is vertical polarization.
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The paper considers cross-polarization and suboptimal adaptive cancellation on satellite links. A one-parameter device is suggested, based on the principle showing that on linearly polarized links differential phase shift tends to produce a cross-polarized signal in quadrature with the wanted by: 3.
A one-parameter system, suitable for dual linearly polarized satellites, has been developed for performing adaptive cancellation of cross polarization. The system is based on the principle that on linearly polarized links differential phase shifts produce a cross-polarized signal in quadrature with the desired polarization.
FIG. 1 is a block diagram of an adaptive cross-polarization interference cancellation arrangement for use in cancellation of cross-polarization interference between a desired polarization signal and interfering cross-polarization components from a second orthogonally polarized signal received in overlapping frequency by: XPIC – Cross Polarization Interference Cancellation.
XPIC is a feature used on Carrier-Class Microwave Link installations to increase capacity and spectral efficiency of a link. A Microwave Link using XPIC technology capabilities effectively doubles the potential capacity of a Microwave Path. XPIC allows the assignment of the same frequency to both the vertical & horizontal Polarization.
The present invention relates to adaptive equalizers, and more particularly, to an adaptive cross-polarization equalizer that provides for cancellation of an interfering signal due to low cross-polarization isolation caused by rain on high data rate communication by: XPIC Adaptive cancellation of cross-polarization on satellite microwave links.
book Cross Polarization Interference Cancellation. XPIC is a feature used on Carrier-Class Microwave Link installations to increase capacity and spectral efficiency of a link.
A Microwave Link using XPIC technology capabilities effectively doubles the potential capacity of a Microwave Path. XPIC allows the assignment of the same frequency to both the vertical & horizontal Polarization on a Path. signals on the orthogonal polarization in the fixed-satellite service; b) that cross-polarization isolation in prime focus axisymmetric parabolic antenna systems (centre fed), is usually higher than in prime focus offset-fed paraboloid systems; c) that for small aperture antennas (e.g.
m), offset fed antenna geometry has theFile Size: 72KB. user earth station A and user earth station B are not aligned to those of the satellite as shown in Fig. Thus, cross-polarization interference occurs between A1 and A2, and between B1 and B2 in the receiver.
To counter this interference, a digital cross-polarization interference canceller is. Principles of Adaptive Space-Time-Polarization Cancellation of Broadband Interference Ronald L.
Fante, The MITRE Corporation, Bedford, Massachusetts Abstract In this paper, we discuss and analyze the method of operation of a space-time-polarization. Rajat Acharya, in Satellite Signal Propagation, Impairments and Mitigation, Dynamic/adaptive coding and modulation.
The above two implementations of modcode are fixed in time. In adaptive coding and modulation (ACM), the modcod for each terminal is adaptively tuned over time to meet the current requirements of the terminal.
Cross-polarization due to the atmosphere. Crosstalk cancellation on linearly and circularly polarized communications satellite link.
Dense medium radiative transfer theory: Comparison with experiment and application to microwave remote sensing and polarimetry. ().Author: Sogo OKAMURA and Tomohiro OGUCHI. Nathan Blaunstein, PhD, DSc, is Professor of the Department of Communication Systems Engineering at the Ben-Gurion University of the Negev, Beer Sheva, has published more than articles, six manuals, and six books, and holds five patents in wireless communications, optical and radio, and radars with applications in geophysics and medicine.
Abstract: Co-Channel Dual Polarization (CCDP) technology is an efficient way to double the link capacity in modern communication system. However, the consequent polarization interferences become an inevitable problem to fight. Therefore, a Cross-Polarization Interference Canceller (XPIC) is necessary against the cross-talks.
In order to eliminate it, a cross polarization interference cancellation (XPIC) is necessary, at least under unfavourable propagation conditions.
This paper mainly studies the issue of cross polarization interference cancellation for dually-polarized radio systems over earth-space by: 1. It concerns the development of techniques for the cancellation of the cross-polarization of dual reflectarray antennas for telecom satellite applications.
In particular, CTTC will study recfectarray unit cell topologies that will allow the application of a cross-polarization cancellation method developed by Thales Alenia Space in the framework. FIG. 1 is a block diagram of an adaptive cross-polarization interference cancellation arrangement for use in cancellation of cross-polarization interference between a desired polarization signal and interfering cross-polarization components from a second orthogonally polarized signal received in overlapping frequency channels.
Microwave line of sight link engineering / Pablo Angueira, Juan Antonio Romo. Includes bibliographical references. ISBN 1. Microwave communication systems.
Line-of-sight radio links. Romo, Juan Antonio, – II. Title. TKA54 –dc23 Printed in the United States of America Polarization By Kamran Ahmed Lecture # 7 Contents Polarization Antenna polarization Polarization of satellite signals Cross polarization discrimination Ionospheric depolarization, rain & ice depolarization Polarization The polarization of an electromagnetic wave is File Size: 1MB.
for interference cancellation was first proposed by the principal investigator in  and later used for cancelling cross polarization in satellite communication (21 and in the Microwave Terrestrial Radio Link .
Other possible applications to tactical communications are included in .Author: Yeheskel Bar-Ness, A Dinc, H Messer-Yaron.
Generally, for satellite communication circular polarization is required. But, my doubt is can't we use linear polarization for satellite communication (within the satellite).
links. It should enable the system designer to properly interpret experimental data and assess system performance? considering both the medium’s depolarizing effects on the wave and the wave’s interaction with the antenna of this development is from Stutzman ().
Specifyingthe Polarization State of a WaveFile Size: KB. where denotes the forward scattering amplitude of a raindrop with radius a, and n(a)da is the number of drops per cubic meter in space with radius a in range da and is a function of rainfall rate R.
(Note that the discussion in Sections 2–6 is based on the single-scattering approximation.) Since the propagation factor in a rain medium is exp(−ikr), the real and imaginary parts of k are Cited by: satellite communication system.
SWOT transmits dual-polarized (right and left hand circular polarizations), offset-QPSK (OQPSK) modulated signals with a Mbps information rate per polarization channel using the Earth Exploration Satellite Service (EESS) band: – Megahertz (MHz).
Cross-polarization interference arises in severalFile Size: KB.