Depolarization due to rain: the XPD–CPA relation

Kamp, Max van de

doi:10.1002/sat.672

Cited by 13 publications

(6 citation statements)

References 21 publications

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“…To confirm our prediction methods, Figure 8(b) shows the comparison of XPD at 20 GHz for the MP and gamma (μ = 3) and Van de Kamp's model [27]. The Van de Kamp's model derived empirical evaluation using a large group of measurement results from ITU-R and Olympus project for the relation between XPD and Copolar attenuation (CPA).…”

Section: Raindrop Size Distributionmentioning

confidence: 78%

Effect of raindrop size distribution and rain rate inhomogeneity on the relationship between attenuation and depolarization

Chodkaveekityada

Fukuchi

2017

Satell Commun Network

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SUMMARYIn addition to attenuation, depolarization due to rain is another factor that degrades satellite propagation signals, especially in the higher frequency bands and in places that have high rates of rainfall. A formula to predict cross-polarization as a function of attenuation has been proposed, and it is derived by a theoretical calculation using frequency, the forward scattering amplitude of raindrops, rainfall rates, the raindrop size distribution (DSD), and various other propagation parameters. In this paper, a formula for predicting cross-polarization is derived on the basis of the assumption of a gamma-type DSD up to 100 GHz. These results are compared with conventional exponential-type DSDs, such as the Marshall-and-Palmer DSD. Moreover, for a more realistic propagation situation, we consider the effect on the aforementioned relationship of rainfall rate inhomogeneity along the propagation path. It is shown that, for practical purposes, this inhomogeneity does not have a significant effect on satellite propagation.

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Section: Raindrop Size Distributionmentioning

confidence: 78%

Effect of raindrop size distribution and rain rate inhomogeneity on the relationship between attenuation and depolarization

Chodkaveekityada

Fukuchi

2017

Satell Commun Network

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“…In terms of the variation in XPD-induced interference with earth station Figures 3a-d show the XPD-CPA relations at Ku, Ka, Q and V bands, respectively, for all the locations. XPD-CPA has earlier been identified by Van de Kamp [16] and Paraboni et al [17] as the usual available parameter in communication systems design. Generally speaking, as CPA is high, XPD is low, resulting to large crosstalk.…”

Section: Effect Of Earth Station Receiver Frequencies On Xpd At Specimentioning

confidence: 99%

Assessment of dual-polarized interference due to precipitation for high-capacity satellite communication systems in Nigeria

David¹,

Ajewole

Ojo

et al. 2020

SN Appl. Sci.

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High-capacity satellite systems are specially designed to provide several gigahertz-allotted spectra for multiple spot beams. The reliability of the communication links at high frequencies is often subjected to rain attenuation. In addition to rain attenuation, rain-induced cross-polarization is an important factor for dual-polarization microwave radio communication systems operating at such frequencies. Dual-polarized communication systems adopting frequency reuse usually encounter interference due to a change of transmission energy from one polarization state to another. Signal degradation as a result of some degree of noise causes reduction in the quality of signal between the two orthogonal channels-cross-polarization discrimination (XPD). Therefore, this study assesses the level of degradation due to interference on dual-polarized communication systems for millimeter wave's band over some selected locations in Nigeria using 5 years (2008-2012) data collected at tropical data acquisition network of the Centre for Atmospheric Research Anyigba. Assessment of dual-polarized interference is based on cumulative distribution of XPD at different frequencies, effect of Earth station receiver frequencies on XPD, XPD-CPA (Co-polar attenuation) relationship and XPD-rain rate relations. Influence of polarization tilt angle for linear and circular polarization on XPD was also assessed. The specific result shows that XPD is extremely low at high rain rates for frequency up to 20 GHz. Depolarization effect is better at the lowest availability with higher value of XPD, and its performance contributes to system availability at the low exceedance probabilities. Port Harcourt, Nsukka, Yola and Sokoto experiences increased interference at receiver stations than other locations considered in this study, especially at Q/V band frequencies. Additional fade margin and appropriate mitigation methods for link availability and good quality of service will be required for sustainability.

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“…Rain, with associated absorption, scattering etc., causes co-polarization attenuation (CPA). The XPD-CPA relation depends on frequency, elevation angle, polarization, and raindrop canting angles' spatio-temporal spread [11]. Though an actual fade may be large, typical fade rates allow uplink power control to compensate it; frequency-dependent residual rain-fade margin is 1-3dB.…”

Section: Satellite and Polarization Diversity For Point-to-multipointmentioning

confidence: 99%

Reducing VSAT aperture via satellite MIMO

Jayasimha¹,

Jyothendar²

2008

MILCOM 2008 - 2008 IEEE Military Communications Conference

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Using multiple-input-multiple-output processing for terrestrial multi-path channels is well known. We describe here its use in reducing a terminal's aperture for line-ofsight satellite communications. Differential delay and Doppler between a satellite-pair are equalized at the hub transmitter (for a point-to-point system employing a 2×1 space-time encoder) or the remote receiver (for a dualsatellite polarization diversity system for point-tomultipoint applications) via interference cancellation. System performance is provided for both cases.

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Depolarization due to rain: the XPD–CPA relation

Cited by 13 publications

References 21 publications

Effect of raindrop size distribution and rain rate inhomogeneity on the relationship between attenuation and depolarization

Effect of raindrop size distribution and rain rate inhomogeneity on the relationship between attenuation and depolarization

Assessment of dual-polarized interference due to precipitation for high-capacity satellite communication systems in Nigeria

Reducing VSAT aperture via satellite MIMO

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