An Exact Solution of Coherent Wave Propagation in Rain Medium With Realistic Raindrop Shapes

Bahrami, Mohammad; Rashed-Mohassel, J.

doi:10.2528/pier07100602

Cited by 14 publications

(13 citation statements)

References 21 publications

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“…The attenuation will be greater for horizontal polarization than the vertical polarization as the drops are spheroidal and elongated in the horizontal direction. The polarization dependent estimation of rain attenuation can be performed using point matching technique or T-matrix approach assuming realistic rain drop size distribution [21,22]. We used the spherical rain drop model with Mie scattering in our study as the disdrometer measures rain drops and rain rates assuming spherical drop shape.…”

Section: Rain Attenuation Modelingmentioning

confidence: 99%

RAIN ATTENUATION MODELING IN THE 10-100 GHz FREQUENCY USING DROP SIZE DISTRIBUTIONS FOR DIFFERENT CLIMATIC ZONES IN TROPICAL INDIA

Das¹,

Maitra²,

Shukla³

2010

PIER B

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Abstract-Rain drop size distributions (DSD) are measured with disdrometers at five different climatic locations in the Indian tropical region. The distribution of drop size is assumed to be lognormal to model the rain attenuation in the frequency range of 10-100 GHz. The rain attenuation is estimated assuming single scattering of spherical rain drops. Different attenuation characteristics are observed for different regions due to the dependency of DSD on climatic conditions. A comparison shows that significant differences between ITU-R model and DSD derived values occur at high frequency and at high rain rates for different regions. At frequencies below 30 GHz, the ITU-R model matches well with the DSD generated values up to 30 mm/h rain rate but differ above that. The results will be helpful in understanding the pattern of rain attenuation variation and designing the systems at EHF bands in the tropical region.

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Section: Rain Attenuation Modelingmentioning

confidence: 99%

RAIN ATTENUATION MODELING IN THE 10-100 GHz FREQUENCY USING DROP SIZE DISTRIBUTIONS FOR DIFFERENT CLIMATIC ZONES IN TROPICAL INDIA

Das¹,

Maitra²,

Shukla³

2010

PIER B

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“…7 of Ref. [4] shows this sort of behavior at f ≈ 8 and 30 GHz at 25 • C, but no data are given for f > 40 GHz. We can explain the property of Fig.…”

Section: Fineness Of Drop Size Modelingmentioning

confidence: 89%

“…The translation coefficients α (4) mn,µν and β (4) mn,µν depend on the shift vector r pq = r p0 − r q0 . Making use of the orthogonal properties of the vector spherical wave functions [13], and eliminating the coefficients C pµν and D pµν , we arrive at the set of linear equations…”

Section: Discretizationmentioning

confidence: 99%

“…The attenuation by rain medium has received much attention [1][2][3][4], since it is closely related to the quality of communication systems.…”

Section: Introductionmentioning

confidence: 99%

“…A lot of works have been reported concerning the above effect from the viewpoints of • deterioration of cross polarization discrimination due to the tile of vertical axis by wind [4,5] • change of temperature [4] • incorporation of multiple scattering [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Temperature and Multiple Scattering on Rain Attenuation of Electromagnetic Waves by a Simple Spherical Model

Setijadi¹,

Matsushima

Tanaka³

et al. 2009

PIER

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Abstract-Specific rain attenuation is discussed from the viewpoint of numerical solution for scattering and absorption of electromagnetic waves related to dielectric spheres. Special attention is paid to the quantitative evaluations considering the change of temperature and the existence of multiple scattering effect. The analysis is based on the set of Stratton's vector spherical wave functions and its addition theorem, which lead to the simultaneous linear equations for the expansion coefficients with adaptively selected truncation numbers. Computed extinction cross sections lead directly to the specific rain attenuation, where the Weibull raindrop distribution model is used. It is discussed how the dependence of the permittivity of water on temperature and frequency affects the attenuation property. Furthermore, the effect of multiple scattering is evaluated in terms of the root mean square of attenuation deviation from the simple superposition of single scattering (Mie's) coefficients. Contrary to general belief, this deviation is the highest at around the boundary between microwave and millimeter wave bands.

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Rain attenuation and worst month statistics verification and modeling for 5G radio link system at 26 GHz in Malaysia

Shayea

Nissirat

Nisirat

et al. 2019

Trans Emerging Tel Tech

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The explosive daily dependence on wireless communication services necessitates the research to establish ultrawideband communication systems with ultrahigh bit rate transmission capabilities. The advent of the fifth-generation (5G) microwave link transmitting at millimeter-wave (mm-wave) frequency band is a promising technology to accommodate the escalating demand for wireless services. In this frequency band, however, the behavior of the transmission channel and its climatic properties are a major concern. This is of particular importance in tropical regions where the climate is mainly rainy with large raindrop size and high rainfall rate that may interact destructively with the propagating signal and cause total attenuation for the signal. International Telecommunication Union (ITU) introduced a global rain attenuation model to characterize the effect of rain on the propagating signal at a wideband of frequencies. The validity of this model in tropical regions is still an open question for research. In this paper, real measurements are conducted at Universiti Teknologi Malaysia (UTM), Johor Bahru, Malaysia, to investigate the impact of rain on the propagation of mm-waves at 26 GHz over the microwave 5G radio link system. Rainfall rate and rain attenuation data sets are collected for one year at one sample per min sampling rate. Both data sets are used to estimate signal propagation conditions in comparison to the ITU model prediction. From the presented results, it is found that at 0.01% percentage of time and rainfall rate of about 120 mm/hr, the propagated signal would experience 26.2 dB losses per kilometer traveled. In addition, there is a significant deviation between the empirical estimation of the worst month parameters and the ITU worst month parameter prediction. Similarly, rainfall rate and rain attenuation estimated through the ITU model imposes a large deviation as compared with the measurements. Furthermore, more accurate empirical worst month parameters are proposed that yielded more accurate estimation of the worst month rainfall and rain attenuation predictions in comparison to the ITU model predictions. Trans Emerging Tel Tech. 2019;30:e3697. wileyonlinelibrary.com/journal/ett

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An Exact Solution of Coherent Wave Propagation in Rain Medium With Realistic Raindrop Shapes

Cited by 14 publications

References 21 publications

RAIN ATTENUATION MODELING IN THE 10-100 GHz FREQUENCY USING DROP SIZE DISTRIBUTIONS FOR DIFFERENT CLIMATIC ZONES IN TROPICAL INDIA

RAIN ATTENUATION MODELING IN THE 10-100 GHz FREQUENCY USING DROP SIZE DISTRIBUTIONS FOR DIFFERENT CLIMATIC ZONES IN TROPICAL INDIA

Effect of Temperature and Multiple Scattering on Rain Attenuation of Electromagnetic Waves by a Simple Spherical Model

Rain attenuation and worst month statistics verification and modeling for 5G radio link system at 26 GHz in Malaysia

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