scholarly journals Towards the Quantum Internet: Satellite Control Plane Architectures and Protocol Design

2021 ◽  
Vol 13 (8) ◽  
pp. 196
Author(s):  
Francesco Chiti ◽  
Romano Fantacci ◽  
Roberto Picchi ◽  
Laura Pierucci
Keyword(s):  
Ad Hoc ◽  
Low Earth Orbit ◽  
Protocol Design ◽  
Control Plane ◽  
Entanglement Generation ◽  
Fiber Technology ◽  
Second Tier ◽  
Systems Architectures ◽  
Quantum Internet ◽  
Master Control

The creation of the future quantum Internet requires the development of new systems, architectures, and communications protocols. As a matter of fact, the optical fiber technology is affected by extremely high losses; thus, the deployment of a quantum satellite network (QSN) composed of quantum satellite repeaters (QSRs) in low Earth orbit would make it possible to overcome these attenuation problems. For these reasons, we consider the design of an ad hoc quantum satellite backbone based on the Software-Defined Networking (SDN) paradigm with a modular two-tier Control Plane (CP). The first tier of the CP is embedded into a Master Control Station (MCS) on the ground, which coordinates the entire constellation and performs the management of the CP integrated into the constellation itself. This second tier is responsible for entanglement generation and management on the selected path. In addition to defining the SDN architecture in all its components, we present a possible protocol to generate entanglement on the end-to-end (E2E) path. Furthermore, we evaluate the performance of the developed protocol in terms of the latency required to establish entanglement between two ground stations connected via the quantum satellite backbone.

scholarly journals The Ad Hoc Back-End of the BIRALET Radar to Measure Slant-Range and Doppler Shift of Resident Space Objects

Electronics ◽  
2021 ◽  
Vol 10 (5) ◽  
pp. 577
Author(s):  
Luca Schirru ◽  
Tonino Pisanu ◽  
Angelo Podda
Keyword(s):  
Doppler Shift ◽  
Space Debris ◽  
Ad Hoc ◽  
Low Earth Orbit ◽  
Slant Range ◽  
Radar Systems ◽  
The Earth ◽  
Space Objects ◽  
Resident Space Objects ◽  
Potential Issue

Space debris is a term for all human-made objects orbiting the Earth or reentering the atmosphere. The population of space debris is continuously growing and it represents a potential issue for active satellites and spacecraft. New collisions and fragmentation could exponentially increase the amount of debris and so the level of risk represented by these objects. The principal technique used for the debris monitoring, in the Low Earth Orbit (LEO) between 200 km and 2000 km of altitude, is based on radar systems. The BIRALET system represents one of the main Italian radars involved in resident space objects observations. It is a bi-static radar, which operates in the P-band at 410–415 MHz, that uses the Sardinia Radio Telescope as receiver. In this paper, a detailed description of the new ad hoc back-end developed for the BIRALET radar, with the aim to perform slant-range and Doppler shift measurements, is presented. The new system was successfully tested in several validation measurement campaigns, the results of which are reported and discussed.

scholarly journals Cross-layer issues in MAC protocol design for MIMO ad hoc networks

2006 ◽  
Vol 13 (4) ◽  
pp. 62-76 ◽  
Author(s):  
M. Zorzi ◽  
J. Zeidler ◽  
A. Anderson ◽  
B. Rao ◽  
J. Proakis ◽  
...  
Keyword(s):  
Ad Hoc Networks ◽  
Ad Hoc ◽  
Mac Protocol ◽  
Protocol Design ◽  
Cross Layer ◽  
Hoc Networks

A Cooperative Routing Algorithm to Increase QoS in Wireless E-Healthcare Systems

2013 ◽  
pp. 375-387 ◽  
Author(s):  
Sabato Manfredi
Keyword(s):  
Wireless Network ◽  
Network Performance ◽  
Ad Hoc ◽  
Networked Control Systems ◽  
Routing Algorithm ◽  
Future Generation ◽  
Healthcare Systems ◽  
Ad Hoc Routing ◽  
Cooperative Routing ◽  
Systems Architectures

The recent increased interest in distributed and flexible wireless pervasive applications has drawn great attention to WNCS (Wireless Networked Control Systems) architectures based on WSANs (Wireless Sensor and Actuator Networks) and the resulting Quality of Service obtained in specific applications. Particularly, in wireless E-Healthcare systems based on WSANs, providing certain QoS specifications is crucial for the actuators as they perform actions based on the vital data received from sensors. This chapter is concerned with the performance evaluation of a cooperative routing algorithm QBAR (Queue Based Ad hoc Routing algorithm) for wireless E-Healthcare systems. Simulations have been carried out in order to quantify the impact of the proposed algorithm on the overall network performance, and a comparison with the existing AODV algorithm is presented. The algorithm performances are validated by the Matlab/Simulink-based simulator, TrueTime, which facilitates the co-simulation of controller task execution in real-time kernels and in a wireless network environment. The simulation results highlight that “cooperation” strategies between wireless healthcare devices can strongly improve the reliability of the wireless network, and hence, they are suitable and rewarding for the management of the future generation of E-Healthcare systems.

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