scholarly journals Analysis of Time Diversity Gain for Satellite Communication Link based on Ku-Band Rain Attenuation Data Measured in Malaysia

2018 ◽  
Vol 8 (4) ◽  
pp. 2608
Author(s):  
Islam Md. Rafiqul ◽  
Ali Kadhim Lwas ◽  
Mohamed Hadi Habaebi ◽  
Md Moktarul Alam ◽  
Jalel Chebil ◽  
...  
Keyword(s):  
Satellite Communication ◽  
Satellite Communications ◽  
Earth Satellite ◽  
Rain Attenuation ◽  
Diversity Gain ◽  
Communication Link ◽  
Time Diversity ◽  
Communication Links ◽  
System Time ◽  
Diversity Technique

<p><span>This paper reports a study on mitigation of propagation impairments on Earth–space communication links. The study uses time diversity as a technique for mitigating rain propagation impairment in order to rectify rain fade. Rain attenuation time series along earth-to-satellite link were measured for two years period at 12.255 GHz in Malaysia. The time diversity technique was applied on measured rain fade to investigate the level of possible improvement in system. Time diversity gain from measured one-minute rain attenuation for two years period was estimated and significant improvement was observed with different delays of time. These findings will be utilized as a useful tool for link designers to apply time diversity as a rain fade mitigation technique in Earth-satellite communications systems.</span></p>

scholarly journals Investigation of time diversity gain for earth to satellite link using rain rate gain

2019 ◽  
Vol 8 (3) ◽  
pp. 951-959
Author(s):  
Md. Moktarul Alam ◽  
Islam Md. Rafiqul ◽  
Khairayu Badron ◽  
Farah Dyana A. R. ◽  
Hassaan Dao ◽  
...  
Keyword(s):  
Communication Systems ◽  
Rain Rate ◽  
Satellite Communications ◽  
Rain Attenuation ◽  
Diversity Gain ◽  
Potential Candidate ◽  
Tropical Regions ◽  
Frequency Bands ◽  
Time Diversity ◽  
One Year

The utilization of satellites for communication systems has expanded considerably in recent years. C and Ku-bands of frequencies are already congested because of high demand. Future directions of satellite communications are moving towards Ka and V-bands. Earth to satellite communications are moving towards higher frequency bands in future which are more sensitive to environment. Rain causes severe degradation in performances at higher frequency bands specially in tropical regions. Several mitigation techniques are proposed to design reliable system. Time diversity is one of the potential candidate for it. However, time diversity analysis requires measured rain attenuation data. For future high frequency link design those data are not available at most of the places. This thesis proposes a method to utilize 1-minute rain rate to analyze time diversity technique at any desired frequency. This paper proposes a method to utilize 1-minute rain rate to analyse time diversity rain rate gain. In proposed method, it is assumed that rain rate gain with delay can represent rain attenuation gain with delay for same period of time at same location. The characteristics of rain rate and rain attenuation almost same because the attenuation causes due to rain.  One year measured rain rate in Malaysia is used to predict rain rate gain. The measured gain at 12.225 GHz signal is compared with that predicted by ITU-R based on rain rate measurement and is found good agreement. Hence it is recommended that the time diversity gain can be predicted using measured rain rate for any desired frequencies.

scholarly journals Optimal approach for building scheduling algorithm in satellite communication

2018 ◽  
Vol 7 (2.28) ◽  
pp. 181
Author(s):  
Ali M. Al-Saegh
Keyword(s):  
Quality Of Service ◽  
Communication Networks ◽  
Satellite Communication ◽  
Scheduling Algorithm ◽  
Satellite Communications ◽  
Satellite Networks ◽  
Communication Links ◽  
Optimal Approach ◽  
Proper Solutions

Building scheduling algorithms in satellite communication links became a necessity according to the typical problems that satellite networks suffers from, such as congestions, jamming, mobility, atmospheric impairment, and achieving the quality of service (QoS) requirements. However, building efficient algorithms needs several considerations that should be taken into account. Such as satellite and earth station node(s), link parameters and specifications, along with the service requirements and limitations. This paper presents efficient approach for accumulating the effective considerations that the designer should employ as a framework for building proper and efficient scheduling algorithm. The proposed approach provides proper solutions to the satellite communications impairments and satisfies the quality of service requirements in satellite communication networks.  

Simulative Investigation on the Effect of Different Parameters on the Performance of IsOWC System

2017 ◽  
Vol 38 (3) ◽  
Author(s):  
Mehtab Singh
Keyword(s):  
Communication Systems ◽  
Satellite Communication ◽  
Communication Link ◽  
Optical Wireless ◽  
Antenna Aperture ◽  
Aperture Diameter ◽  
Pointing Errors ◽  
Signal Degradation ◽  
Communication Links ◽  
Radio Frequency Signals

AbstractInter-satellite communication links are very crucial between satellites orbiting around the earth in order to transmit information between them and also for the purpose of data relaying from one satellite station to other stations and ground stations. Inter-satellite optical wireless communication (IsOWC) links involve the application of optical wireless signals as compared to radio frequency signals used in traditional satellite communication systems. One of the major problems leading to the performance degradation of IsOWC link is the signal degradation due to satellite vibrations also known as pointing errors. In this paper, the performance of an IsOWC communication link has been investigated for different system parameters such as data transmission rates, antenna aperture diameter, transmission power levels, operating wavelength and responsivity of photodiode by analyzing

Rain Height Statistics from Spaceborne Radar for Satellite Communication in Malaysia

2012 ◽  
Vol 58 (1) ◽  
Author(s):  
Nor Azlan Mohd Aris
Keyword(s):  
Satellite Communication ◽  
Tropical Rainfall Measuring Mission ◽  
Rain Attenuation ◽  
Peninsular Malaysia ◽  
Equatorial Region ◽  
Radiowave Propagation ◽  
Tropical Region ◽  
Propagation Modeling ◽  
Bright Band ◽  
Communication Links

Tropical and equatorial region exhibit significantly higher rainfall compared to the temperate region leading to higher attenuation for satellite communication links. One of the issues in radiowave propagation modeling is the different precipitation structures which play an important role in the estimation of rain fade. However, few results on rain height over Malaysian equatorial stations have been presented so far. To this aim, an investigation on rain height derived from Tropical Rainfall Measuring Mission (TRMM) Precipitation Radar (PR) is carried out. In this paper, the bright–band heights (hBB) have been analyzed to obtain monthly average values of the rain height (hR). TRMM PR is one of the most powerful instruments able to observe vertical profiles of rainfall. The analysis covers stratiform events around peninsular Malaysia. It is well known that hBB exists slightly below the 0°C isotherm height (h0) and this may lead to the estimation of rain height (hR). The obtained results on rain height are then compared with radiosonde observations and ITU–R Recommendation P.839–3. It is found that the bright–band height (hBB) appears to vary throughout the year and will mostly lie between 4192 m and 4593 m above mean sea level. The results suggest that by carefully consider the physical information of rain height derived from the various local databases should lead to substantial improvements in the rain attenuation prediction accuracy for equatorial and tropical region.

scholarly journals Investigation of accuracy of rain-rate and rain-attenuation prediction models in satellite communications based on meteorological skills

MAUSAM ◽  
2021 ◽  
Vol 68 (4) ◽  
pp. 621-632
Author(s):  
MEHRAN BEHJATI ◽  
JIT SINGH MANDEEP ◽  
MAHAMOD ISMAIL ◽  
ROSDIADEE NORDIN
Keyword(s):  
Prediction Model ◽  
Rain Rate ◽  
Prediction Models ◽  
Satellite Communications ◽  
Rain Attenuation ◽  
Vital Role ◽  
Measured Data ◽  
Radio Link ◽  
Communication Link ◽  
Specific Prediction

Rainfall is a major destructive factor which severely reduces the quality and reliability of propagated signals in satellite communications. Hence, rain-attenuation prediction plays a vital role in the satellite radio link planning and engineering. The accuracy of the rain-attenuation prediction models depends on two things; (i) the accuracy of rain-rate information and (ii) the area of study. Therefore, selecting an appropriate rain-attenuation prediction model for a new site without having any specific prediction model and experimental measured rain-rate would be challenging. In this regard, this letter takes advantage of climatology skills to find an accurate model for such kind of areas. To do so, we study the Urmia-site (37.55° N, 45.1° E) and its communication link with the Eutelsat 25A (25.5° E), where there is no available experimental measured data and specific prediction models for that site. Therefore, based on the meteorological skills, the Yong-in site in South-Korea (37.43° N, 126.93° E) was chosen, as a homogeneous area with Urmia, which has available measured data of rainfall and rain-attenuation. Afterward, the most common used global prediction models are applied to Yong-in and the results are compared with the existing measurements. Consequently, the more accurate rain-rate and rain-attenuation prediction models are investigated and generalized to Urmia, which are the ITU-R P.837-5 model with 34% r.m.s. and the Joo-Hwan model with 18% r.m.s., respectively. Finally, the amount of rain-attenuation in different useful frequency bands (10-50 GHz) is investigated for Urmia by the Joo-Hwan model.

Research of Rain Attenuation of Ka-Band Satellite Communication System

2013 ◽  
Vol 433-435 ◽  
pp. 1526-1529
Author(s):  
Li Rong
Keyword(s):  
Communication System ◽  
Satellite Communication ◽  
Meteorological Factors ◽  
Satellite Communications ◽  
Rain Attenuation ◽  
Narrow Beam ◽  
Ka Band ◽  
Satellite Communication System ◽  
Large Bandwidth ◽  
Compensation Methods

Ka-band satellite communication system has some advantages including a large bandwidth, a huge capacity, a narrow beam, a small terminal size, which makes it a trend in future satellite communications. However, the system is now faced with great challenge-meteorological factors, which aroused suspicion among researchers about its realization. In this paper, the feature of rain fade is analyzed and several compensation methods are presented.

Evaluation of AASHTO SiteManager Performance on High-Latency Satellite Communication Links

2005 ◽  
Vol 1935 (1) ◽  
pp. 17-27
Author(s):  
Tien-Chien Chen ◽  
James V. Krogmeier ◽  
Darcy M. Bullock
Keyword(s):  
Satellite Communication ◽  
Transmission Control Protocol ◽  
Poor Performance ◽  
Satellite Communications ◽  
Low Latency ◽  
Communication Links ◽  
High Bandwidth ◽  
Terrestrial Network ◽  
Transportation Agencies ◽  
Viable Method

Most transportation agencies and departments have deployed transmission control protocol–Internet protocol (TCP-IP) applications in their offices and are beginning to deploy TCP-IP applications in remote or satellite field offices. Deployment of TCP-IP applications where broadband access is not available can be quite challenging. Satellite-based communication offers an opportunity to provide high-bandwidth connections quickly. However, satellite communications incur significant travel time delay that may result in poor performance of applications designed for a low-latency environment. This paper presents an evaluation of the AASHTO SiteManager software suite with two different satellite broadband providers. SiteManager clients performed poorly in the high-latency environment, in some cases up to 50 times slower than with SiteManager running on a low-latency terrestrial network with equivalent bandwidth. In general, the performance of SiteManager was relatively insensitive to the bandwidth provided by the satellite provider. In most tasks, SiteManager performed better over a 50-kbps dial-up connection than over a 384-kbps satellite connection. In an alternative architecture in which SiteManager was operated remotely via a terminal emulation service over a satellite connection, the performance was observed to be robust. This architecture requires considerably more equipment, software, and technical support. Furthermore, the delay in seeing some key-strokes and cursor movements appear can be somewhat awkward for the user. However, given the extensive bursts of short messages between SiteManager clients and the server, the high-latency constraints of a satellite network make a terminal emulation procedure the only viable method of deploying SiteManager via a commercial satellite IP service.

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