scispace - formally typeset
Search or ask a question
Author

Arijit De

Bio: Arijit De is an academic researcher from Netaji Subhash Engineering College. The author has contributed to research in topics: Attenuation & Precipitation. The author has an hindex of 3, co-authored 16 publications receiving 31 citations. Previous affiliations of Arijit De include West Bengal University of Technology & University of Calcutta.

Papers
More filters
Journal ArticleDOI
TL;DR: In this paper, the authors proposed a technique by which the diversity gain can be estimated for a site utilizing the propagation data obtained at a single station, which is crucial in estimating diversity parameters in the absence of multi-station data.

15 citations

Journal ArticleDOI
TL;DR: The association of the prerain scintillations with both the cloud thickness and the prevailing convection is indicated and the convective available potential energy has been considered as a parameter indicating the strength of the associated convection.
Abstract: In this letter, the tropospheric scintillations occurring just before rain commencement have been investigated. This letter indicates the association of the prerain scintillations with both the cloud thickness and the prevailing convection. The convective available potential energy has been considered as a parameter indicating the strength of the associated convection.

10 citations

Journal ArticleDOI
TL;DR: In this article, the authors studied the rain-induced propagation characteristics over a tropical location Kolkata, India, using the data collected over a 7-year period, i.e., 2004-2010.
Abstract: This paper studies the rain-induced propagation characteristics over a tropical location Kolkata, India, using the data collected over a 7 year period, i.e., 2004–2010. This location experiences substantial rainfall during the Indian Summer Monsoon (ISM) season which is preceded by premonsoon rainfall accompanied by strong convection. Accumulations, event duration, and fade duration statistics are presented. Long-term observations for three propagation effects, namely rain attenuation, scintillations, and depolarization, are analyzed in this paper. The seasonal patterns of these phenomena are examined to reveal the characteristic features of Kolkata. The interrelations among rain rate, rain attenuation, scintillations, and depolarization are also investigated. Propagation detriments for identical rain rates are more severe in premonsoon compared to monsoon period, mainly because of the different microphysical properties of precipitation. However, the percentage occurrences of various propagation effects are higher in monsoon than premonsoon.

9 citations

Journal ArticleDOI
TL;DR: In this paper, the authors investigated cloud attenuation at 30 GHz frequency using ground-based microwave radiometric observations at a tropical location, Kolkata, and compared the exceedance probability of cloud and rain attenuation.

4 citations

Journal ArticleDOI
TL;DR: In this article , the authors presented a reliable 30 min to one-minute integration time conversion model suitable for tropical locations, as well as information on seasonal rain attenuation statistics which would be utilized for effective satellite communication systems by the radio engineers.

3 citations


Cited by
More filters
Journal ArticleDOI
TL;DR: In this paper, the relation between thermal anomalies and seismic activity was established for Middle Asia on the basis of a 7-year series of thermal images, which indicated the presence of positive thermal anomalies that are associated with the large linear structures and fault systems of the Earth's crust.
Abstract: NOAA/AVHRR thermal images indicated the presence of positive thermal anomalies that are associated with the large linear structures and fault systems of the Earth's crust. The relation between thermal anomalies and seismic activity was established for Middle Asia on the basis of a 7-year series of thermal images. Thermal anomaly has been located near Beijing, on the border between the mountains and plain. The size of this anomaly is about 700 km long and 50 km wide. The anomaly appeared about 6-24 days before and continued about a week after an earthquake. The anomaly was sensitive to crust earthquakes with a magnitude more than 4.7 and for a distance of up to 500 km. The amplitude of this anomaly was about 3 C.

101 citations

01 Jan 1991
TL;DR: In this article, only the timing temperature data limited to some sites can be obtained instead of dynamic evolution data of the temperature in a large area within the seismogenic range, and studies have been made on this phenomenon.
Abstract: People have already recognized the temperature-increase anomaly before earthquakes and studies have been made on this phenomenon. With the method of fixed-point network observation, only the timing temperature data limited to some sites can be obtained instead of dynamic evolution data of the temperature in a large area within the seismogenic range.

72 citations

Journal ArticleDOI
TL;DR: A comprehensive survey of the state-of-the-art of integrated satellite-terrestrial networks toward 6G is presented in this paper , where an executive classification and summary of the integration architecture is presented from network design to performance optimization.
Abstract: With the increasing global communication demands and the development of Internet of Things (IoT), extending the connectivity to rural and remote areas has become imperative for future networks. The sixth-generation (6G) network is expected to provide heterogeneous services and seamless network coverage for everyone and everything. Combining the advantages of both satellite and terrestrial networks, the integrated satellite-terrestrial network architecture is promising to provide global broadband access for all types of users, which has drawn much attention from both the academia and industry. In this article, we present a comprehensive survey of the state-of-the-art of integrated satellite-terrestrial networks toward 6G. First, an executive classification and summary of the integration architecture is presented from network design to performance optimization. Then, typical applications of the integrated satellite-terrestrial network are discussed based on the architecture. By considering the unique characteristics of the two networks, main challenges are pointed out when performing integration, such as the long propagation delay, complex link conditions, and high dynamics of the network topology. Finally, some promising future techniques are explored from the perspective of the integrated architecture. A detailed survey of the potential integration architectures is of great importance to enable more flexible network design and construction in future 6G networks. This article will provide a valuable guideline on future research and development of integrated satellite-terrestrial networks.

46 citations

Journal ArticleDOI
TL;DR: The measured rain rate and rain attenuation distributions are analysed and benchmarked with several previous measurements and well-known prediction models and showed that the best agreement between the measured rainfall rate in Malaysia and the ITU-R PN is shown.
Abstract: The high frequencies of millimeter wave (mm-wave) bands have been recognized for the fifth generation (5G) and beyond wireless communication networks. However, the radio propagation channel at high frequencies can be largely influenced by rain attenuation, especially in tropical regions with high rainfall intensity. In this paper, we present the results of rainfall intensity and rain attenuation in tropical regions based on one-year measurement campaign. The measurements were conducted from September 2018 until September 2019 at 21.8 GHz (K-band) and 73.5 GHz (E-band) in Malaysia. The rainfall intensity was collected using three rain gauges installed along a 1.8 km link. The rain attenuation is computed from the difference between the measured minimum received signal level (RSL) during clear sky and rain conditions. The measured rain rate and rain attenuation distributions are then analysed and benchmarked with several previous measurements and well-known prediction models such as the ITU-R P. 530-17. The rainfall rate results showed that the best agreement between the measured rainfall rate in Malaysia and the ITU-R PN.837-1 prediction value for Zone P is up to 0.01% of time (99.99% of time agrees well and only disagrees for 0.01% of time). For the E-band, the maximum measured rain attenuation exceeding 0.03% of the year is around 40.1 and 20 dB for 1.8 and 0.3 km links, respectively, at the maximum rain rate of 108 mm/h. For the K-band, the maximum rain attenuation exceeding 0.01% of the year is around 31 dB for the 1.8 km link. Finally, the rain rates exceeding 108 and 180 mm/h at 73.5 and 21.8 GHz, respectively, along the 1.8 km path caused an outage on our measurement setup. The rain rate of 193 mm/h and above caused an outage for the 0.3 km E-band link. The experimental data as well as the presented data analysis can be utilized for efficient planning and deployments of mm-wave wireless communication systems in tropical regions.

28 citations

Proceedings Article
01 Jan 1980
TL;DR: In this article, three experimental programs at Bell Laboratories, Crawford Hill, NJ, have collected rain attenuation data at three frequencies in the 10-30 GHz range for over 2 years.
Abstract: Three experimental programs at Bell Laboratories, Crawford Hill, NJ, have collected rain attenuation data at three frequencies in the 10-30 GHz range for over 2 years. As expected from a simple geometrical model, rain attenuation statistics scale approximately as the cosecant of the path elevation angle. Thus, greater attenuation is encountered on lower elevation angle paths. The increased rain attenuation at higher frequencies is illustrated by comparing cumulative rain attenuation distributions at three widely separated frequencies. Typical year-to-year variations in these distributions are presented. Periods of severe rain attenuation are shown to occur more frequently during the summer months and during the afternoon hours. Cumulative attenuation distributions are compared for these and other time periods.

25 citations