scholarly journals Atmospheric gas impact on fixed satellite communication link a study of its effects at Ku, Ka and V bands in Nigeria

2011 ◽  
Author(s):  
T. V. Omotosho ◽  
J. S. Mandeep ◽  
M. Abdullah
Keyword(s):  
Satellite Communication ◽  
Communication Link

A 2 × 20 Gbps hybrid MDM-OFDM–based high-altitude platform-to-satellite FSO transmission system

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Vel Murugan Gomathy ◽  
T. V. Paramasivam Sundararajan ◽  
C. Sengodan Boopathi ◽  
Pandiyan Venkatesh Kumar ◽  
Krishnamoorthy Vinoth Kumar ◽  
...  
Keyword(s):  
High Altitude ◽  
Orthogonal Frequency Division Multiplexing ◽  
High Speed ◽  
Satellite Communication ◽  
Input Power ◽  
Transmission System ◽  
Communication Link ◽  
Space Optics ◽  
High Altitude Platform ◽  
Mode Division Multiplexing

AbstractIn the present study, the application of free space optics (FSO) transmission system to realize a long-reach high-altitude platform (HAP)-to-satellite communication link has been exploited. High-speed information transmission without interference is accomplished using orthogonal frequency division multiplexing (OFDM). Further, the information capacity of the proposed system is increased by employing mode division multiplexing (MDM). We have investigated the proposed MDM-OFDM-HAP-to-satellite FSO transmission system performance over varying FSO range, diameter of the receiver, pointing errors, and input power. Also, an improved transmission performance of the proposed system using a square root module is reported.

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>

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

Development of a Web-based picture archiving and communication system using satellite data communication

2000 ◽  
Vol 6 (2) ◽  
pp. 91-96 ◽  
Author(s):  
Seoncheol Hwang ◽  
Jeongwhan Lee ◽  
Heejoung Kim ◽  
Myoungho Lee
Keyword(s):  
Satellite Data ◽  
Communication System ◽  
Satellite Communication ◽  
Data Communication ◽  
Image Transmission ◽  
Communication Link ◽  
Web Based ◽  
Remote Hospital ◽  
Picture Archiving ◽  
Picture Archiving And Communication

Using the JAVA language we have developed a Web-based picture archiving and communication system PACS which allows a remote hospital to access medical images. An asymmetric satellite data communication system ASDCS provided a receive-only link for data delivery and a conventional terrestrial link which could be the conventional telephone network allowed data transmission. The satellite communication link was 10- 30 times faster than the conventional terrestrial link. To increase image transmission speeds over the Internet connection, JPEG and wavelet compression methods were used. The resulting images were evaluated quantitatively by measuring the peak signal:noise ratio and qualitatively by radiologists. Compression ratios of 10:1 or less were deemed acceptable for diagnostic purposes. The system appears to be suitable for teleradiology and telemedicine.

scholarly journals Global Ionospheric Scintillation Model: current status and further development strategies

2021 ◽  
Author(s):  
Dmytro Vasylyev ◽  
Yannick Beniguel ◽  
Volker Wilken ◽  
Martin Kriegel ◽  
Jens Berdermann
Keyword(s):  
Satellite Communication ◽  
Three Dimensional ◽  
Extensive Study ◽  
Current Status ◽  
Ionospheric Scintillation ◽  
Communication Link ◽  
Present Contribution ◽  
First Results ◽  
Satellite Ground Station ◽  
Further Development

&lt;p&gt;When a electromagnetic wave propagates through a random inhomogeneous medium, scattering by the refractive index inhomogeneities can lead to a wide variety of phenomena that have been the subject of extensive study and modelling. The Global Ionospheric Scintillation Model (GISM) is primarily intended to model the phenomena relevant for the GNSS applications and provides the amplitude and phase scintillation indices. Due to the three dimensional nature of the GISM model it is capable to describe a variety of communication geometries such as satellite-ground station or satellite-satellite communication link. Moreover, it can calculate the scintillation maps at specific altitude allowing to obtain the 3D picture of scintillation.&lt;/p&gt;&lt;p&gt;Recently the GISM model has been handed over to the newly established DLR Institute of Solar-Terrestrial Physics. Since then the model underwent several modernization steps. For example, the programming paradigm has been changed to the object-oriented one in order to bring more flexibility into the code.&amp;#160; In the present contribution we present the first results of our works and discuss strategies for further development, extension, and validation of the GISM.&lt;/p&gt;

scholarly journals Virtualized High Throughput Satellite Gateway with a Global Bandwidth Management Method

2022 ◽  
Vol 2022 ◽  
pp. 1-11
Author(s):  
Haike Liu ◽  
Huajian Zhang ◽  
Kai Yang ◽  
Jiali Li
Keyword(s):  
Resource Management ◽  
Satellite Communication ◽  
Control Method ◽  
Network Function Virtualization ◽  
Communication Link ◽  
Bandwidth Management ◽  
Network Function ◽  
User Terminal ◽  
Management Method ◽  
Limiting Condition

With the development of new satellite payload technology, in order to improve the utilization of system resources, research is based on software-defined network (SDN) and network function virtualization (NFV) gateway architecture. Based on this architecture, the system realizes global resource management and overall data distribution, which can solve the problem of resource allocation and maximum/minimum rate guarantee between different VNO terminals under different beams, different gateways, and different satellites. For this, a global bandwidth management method can be used which is mainly a process of management to control the traffic on a communication link. The proposed global resource management and control method can be based on the rate guarantee value of the VNO/terminal configured in the system as the basic limiting condition and reallocate the rate guarantee value limiting parameter according to the resource application status of the online terminal. The method can maximize the resource utilization of the entire satellite communication system and satisfy the resource request of the user terminal as much as possible.

Sign in / Sign up

Export Citation Format

Share Document