LEO-MIMO Satellite Systems for High Capacity Transmission

2018 ◽  
Author(s):  
Daisuke Goto ◽  
Hiroki Shibayama ◽  
Fumihiro Yamashita ◽  
Takaya Yamazato
Keyword(s):  
High Capacity ◽  
Satellite Systems

scholarly journals Latency-Aware Offloading in Integrated Satellite Terrestrial Networks

2020 ◽  
Author(s):  
Wiem Abderrahim ◽  
Osama Amin ◽  
Mohamed-Slim Alouini ◽  
Basem Shihada
Keyword(s):  
Communication Networks ◽  
Rural Areas ◽  
Access Network ◽  
High Capacity ◽  
High Load ◽  
Traffic Load ◽  
Satellite Systems ◽  
High Data ◽  
Data Rates ◽  
Terrestrial Networks

Next-generation communication networks are expected to integrate newly-used technologies in a smart way to ensure continuous connectivity in rural areas and to alleviate the traffic load in dense regions. The prospective access network in 6G should hinge on satellite systems to take advantage of their wide coverage and high capacity. However, adopting satellites in 6G could be hindered because of the {additional latency introduced}, which is not tolerable by all traffic types. Therefore, we propose a traffic offloading scheme that integrates both the satellite and terrestrial networks to smartly allocate the traffic between them while satisfying different traffic requirements. Specifically, the proposed scheme offloads the Ultra-Reliable Low Latency Communication (URLLC) traffic to the terrestrial backhaul to satisfy its stringent latency requirement. However, it offloads the enhanced Mobile Broadband (eMBB) traffic to the satellite since eMBB needs high data rates but is not always sensitive to delay. Our scheme is shown to reduce the transmission delay of URLLC packets, decrease the number of dropped eMBB packets, and hence improve the network's availability. Our findings highlight that the inter-working between satellite and terrestrial networks is crucial to mitigate the expected high load on the limited terrestrial capacity.<br>

Hybrid Space-Ground Processing for High-Capacity Multi-Beam Satellite Systems

2011 ◽  
Author(s):  
J. Arnau-Yanez ◽  
M. Bergmann ◽  
E. A. Candreva ◽  
G. E. Corazza ◽  
R. de Gaudenzi ◽  
...  
Keyword(s):  
High Capacity ◽  
Satellite Systems ◽  
Hybrid Space

scholarly journals Latency-Aware Offloading in Integrated Satellite Terrestrial Networks

2020 ◽  
Author(s):  
Wiem Abderrahim ◽  
Osama Amin ◽  
Mohamed-Slim Alouini ◽  
Basem Shihada
Keyword(s):  
Communication Networks ◽  
Rural Areas ◽  
Access Network ◽  
High Capacity ◽  
High Load ◽  
Traffic Load ◽  
Satellite Systems ◽  
High Data ◽  
Data Rates ◽  
Terrestrial Networks

Next-generation communication networks are expected to integrate newly-used technologies in a smart way to ensure continuous connectivity in rural areas and to alleviate the traffic load in dense regions. The prospective access network in 6G should hinge on satellite systems to take advantage of their wide coverage and high capacity. However, adopting satellites in 6G could be hindered because of the {additional latency introduced}, which is not tolerable by all traffic types. Therefore, we propose a traffic offloading scheme that integrates both the satellite and terrestrial networks to smartly allocate the traffic between them while satisfying different traffic requirements. Specifically, the proposed scheme offloads the Ultra-Reliable Low Latency Communication (URLLC) traffic to the terrestrial backhaul to satisfy its stringent latency requirement. However, it offloads the enhanced Mobile Broadband (eMBB) traffic to the satellite since eMBB needs high data rates but is not always sensitive to delay. Our scheme is shown to reduce the transmission delay of URLLC packets, decrease the number of dropped eMBB packets, and hence improve the network's availability. Our findings highlight that the inter-working between satellite and terrestrial networks is crucial to mitigate the expected high load on the limited terrestrial capacity.<br>

scholarly journals Temperature Sensor Assisted Lifetime Enhancement of Satellite Embedded Systems via Multi-Core Task Mapping and DVFS

Sensors ◽  
2019 ◽  
Vol 19 (22) ◽  
pp. 4902 ◽  
Author(s):  
Beomsik Kim ◽  
Hoeseok Yang
Keyword(s):  
Embedded Systems ◽  
High Performance ◽  
High Capacity ◽  
Low Earth Orbit ◽  
Task Mapping ◽  
Solar Panels ◽  
Satellite Systems ◽  
Weight Problems ◽  
Dynamic Voltage ◽  
Core Mapping

Recently, thanks to the miniaturization and high performance of commercial-off-the-shelf(COTS) computer systems, small satellites get popular. However, due to the very expensive launchingcost, it is critical to reduce the physical size and weight of the satellite systems such as cube satellites(CubeSats), making it infeasible to install high capacity batteries or solar panels. Thus, the low-powerdesign is one of the most critical issues in the design of such systems. In addition, as satellitesmake a periodic revolution around the Earth in a vacuum, their operating temperature varies greatly.For instance, in a low earth orbit (LEO) CubeSats, the temperatures vary from 30 to -30 degreesCelsius, resulting in a big thermal cycle (TC) in the electronic parts that is known to be one of themost critical reliability threats. Moreover, such LEO CubeSats are not fully protected by activethermal control and thermal insulation due to the cost, volume, and weight problems. In thispaper, we propose to utilize temperature sensors to maximize the lifetime reliability of the LEOsatellite systems via multi-core mapping and dynamic voltage and frequency scaling (DVFS) underpower constraint. As conventional reliability enhancement techniques primarily focus on reducingthe temperature, it may cause enlarged TCs, making them even less reliable. On the contrary,we try to maintain the TC optimal in terms of reliability with respect to the given power constraint.Experimental evaluation shows that the proposed technique improves the expected lifetime of thesatellite embedded systems by up to 8.03 times in the simulation of Nvidia’s Jetson TK1.

CuS2 sheets: a hidden anode material with a high capacity for sodium-ion batteries

2021 ◽  
Author(s):  
Shaohua Lu ◽  
Weidong Hu ◽  
Xiaojun Hu
Keyword(s):  
Lithium Ion Batteries ◽  
Anode Material ◽  
Low Cost ◽  
High Capacity ◽  
Lithium Ion ◽  
Sodium Ion ◽  
Sodium Ion Batteries

Due to their low cost and improved safety compared to lithium-ion batteries, sodium-ion batteries have attracted worldwide attention in recent decades.

Receptor Mediated Binding of the Fibrinolytic Components, Plasminogen and Urokinase, to Peripheral Blood Cells

1987 ◽  
Vol 58 (03) ◽  
pp. 936-942 ◽  
Author(s):  
Lindsey A Miles ◽  
Edward F Plow
Keyword(s):  
T Cells ◽  
B Cell ◽  
Peripheral Blood ◽  
Binding Sites ◽  
Blood Cells ◽  
High Capacity ◽  
Red Cells ◽  
Peripheral Blood Cells ◽  
Cellular Functions ◽  
Fibrinolytic Proteins

SummaryGlu-plasminogen binds to platelets; the monocytoid line, U937, and the human fetal fibroblast line, GM1380 bind both plasminogen and its activator, urokinase. This study assesses the interaction of these fibrinolytic proteins with circulating human blood cells. Plasminogen bound minimally to red cells but bound saturably and reversibly to monocytes, granulocytes and lymphocytes with apparent Kd values of 0.9-1.4 μM. The interactions were of high capacity with 1.6 to 49 × 105 sites/cell and involved the lysine binding sites of plasminogen. Both T cells and non-rosetting lymphocytes and two B cell lines saturably bound plasminogen. Urokinase bound saturably to gianulocytes, monocytes, non-rosetting lymphocytes and a B cell line, but minimally to T cells, platelets and red cells. Therefore, plasminogen binding sites of high capacity, of similar affinities, and with common recognition specificities are expressed by many peripheral blood cells. Urokinase receptors are also widely distributed, but less so than plasminogen binding sites. The binding ol plasminogen and/ or urokinase to these cells may lead to generation of cell- associated proteolytic activity which contributes to a variety of cellular functions.

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