scholarly journals Reconfigurable Intelligent Surface in Wireless-Powered Interference-Limited Communication Networks

Symmetry ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 960
Author(s):  
Kehinde Odeyemi ◽  
Pius Owolawi ◽  
Oladayo Olakanmi
Keyword(s):  
Closed Form ◽  
Communication Networks ◽  
Communication Systems ◽  
Access Point ◽  
Closed Form Expression ◽  
Wireless Communication Systems ◽  
Average Delay ◽  
Limited Communication ◽  
Network Cost ◽  
High Power Consumption

The commercialization of future wireless communication systems faces crucial problems in terms of reduced network cost of deployment and high power consumption. As a result, reconfigurable intelligent surfaces (RIS) have been suggested as a promising approach to overcome these existing challenges. In this paper, the performance of RIS in a wireless-powered interference-limited communication network is investigated. In this network, an energy-constrained access point (AP) is powered by a dedicated multiantenna power beacon (PB) and communicates to a destination limited-interference node via the RIS. It is assumed that the RIS experiences generalized-K fading distribution while the PB and interferers links are subjected to Nakagami-m fading distributions. To evaluate the system performance, the analytical closed-form expression of the probability distribution function (PDF) for the concerned system is derived. Through this, the exact closed-form expressions of the systems outage probability, average delay-tolerance throughput and average bit error rate are obtained. The analysis quantifies the effects of the number of reflecting elements in the RIS, number of interferer nodes, fading parameters on the AP and interferer links and number of antennas on the PB. It is deduced from the results that there is a kind of symmetry relationship between the analytical and simulation results. Additionally, the results illustrate that the proposed system with an RIS outperforms the conventional system without an RIS. Finally, the accuracy of the derived analytical expressions is validated through a Monte-Carlo simulation.

scholarly journals Availability and Reliability in MEC-enabled UAVs for URLLC

2021 ◽  
Author(s):  
Marcos Falcao ◽  
Caio Bruno Souza ◽  
Andson Balieiro ◽  
Kelvin Dias
Keyword(s):  
Communication Networks ◽  
Communication Systems ◽  
Resource Provisioning ◽  
Wireless Communication Systems ◽  
Dynamic Resource Provisioning ◽  
Aerial Vehicle ◽  
Network Functions ◽  
Node Availability ◽  
Multi Access ◽  
Computational Resources

Abstract Unmanned aerial vehicle (UAV) communication networks are key components of the fifth (5G) and beyond (B5G) wireless communication systems. This work aims to develop a dynamic resource provisioning framework to allocate computational resources in a UAV equipped with Multi-access Edge Computing resources (MEC-enabled UAV) that provides on demand communication capabilities to Ultra-reliable low-latency communication (URLLC) services. We propose a dynamic CTMC-based framework to analyze the overall node availability and reliability, while taking into account virtual host setup (repair) delays and failure events for mobile Virtual Network Functions (VNFs) hosted on MEC-enabled UAVs. Numerical results illustrate how virtual resource parameters can impact critical service communication.

scholarly journals An Efficient Approximation for Nakagami-mQuantile Function Based on Generalized Opposition-Based Quantum Salp Swarm Algorithm

2019 ◽  
Vol 2019 ◽  
pp. 1-13 ◽  
Author(s):  
Hongyuan Gao ◽  
Yangyang Hou ◽  
Shibo Zhang ◽  
Ming Diao
Keyword(s):  
Wireless Communication ◽  
Communication Systems ◽  
Quantile Function ◽  
Closed Form Expression ◽  
Wireless Communication Systems ◽  
Form Expression ◽  
Salp Swarm Algorithm ◽  
Simulation Results ◽  
Swarm Algorithm ◽  
Theoretical Analyses

With the further research in communication systems, especially in wireless communication systems, a statistical model called Nakagami-mdistribution appears to have better performance than other distributions, including Rice and Rayleigh, in explaining received faded envelopes. Therefore, the Nakagami-mquantile function plays an important role in numerical calculations and theoretical analyses for wireless communication systems. However, it is quite difficult to operate numerical calculations and theoretical analyses because Nakagami-mquantile function has no exact closed-form expression. In order to obtain the closed-form expression that is able to fit the curve of Nakagami-mquantile function as well as possible, we adopt the method of curve fitting in this paper. An efficient expression for approximating the Nakagami-mquantile function is proposed first and then a novel heuristic optimization algorithm—generalized opposition-based quantum salp swarm algorithm (GO-QSSA)—which contains quantum computation, intelligence inspired by salp swarm and generalized opposition-based learning strategy in quantum space, to compute the coefficients of the proposed expression. Meanwhile, we compare GO-QSSA with three swarm intelligence algorithms: artificial bee colony algorithm (ABC), particle swarm optimization algorithm (PSO), and salp swarm algorithm (SSA). The comparing simulation results reveal that GO-QSSA owns faster convergence speed than PSO, ABC, and SSA. Moreover, GO-QSSA is capable of computing more accurately than traditional algorithms. In addition, the simulation results show that compared with existing curve-fitting-based methods, the proposed expression decreases the fitting error by roughly one order of magnitude in most cases and even higher in some cases. Our approximation is proved to be simple and efficient.

scholarly journals Novel method for fog monitoring using cellular networks infrastructures

2012 ◽  
Vol 5 (4) ◽  
pp. 5725-5752 ◽  
Author(s):  
N. David ◽  
P. Alpert ◽  
H. Messer
Keyword(s):  
Communication Networks ◽  
Communication Systems ◽  
Ground Level ◽  
Economic Damage ◽  
Wireless Communication Systems ◽  
Distributed Sensor ◽  
Distributed Sensor Network ◽  
Traffic Delays ◽  
Crucial Information ◽  
Novel Method

Abstract. A major detrimental effect of fog is visibility limitation which can result in serious transportation accidents, traffic delays and therefore economic damage. Existing monitoring techniques including satellites, transmissometers and human observers – suffer from low spatial resolution, high cost or lack of precision when measuring near ground level. Here we show a novel technique for fog monitoring using wireless communication systems. Communication networks widely deploy commercial microwave links across the terrain at ground level. Operating at frequencies of tens of GHz they are affected by fog and are, effectively, an existing, spatially world-wide distributed sensor network that can provide crucial information about fog concentration and visibility. Fog monitoring potential is demonstrated for a heavy fog event that took place in Israel. The correlation between transmissomters and human eye observations to the visibility estimates from the nearby microwave links was found to be 0.53 and 0.61, respectively. These values indicate the high potential of the proposed method.

scholarly journals A Framework Coupling VISSIM and OMNeT++ to Simulate Future Intelligent Transportation Systems

2021 ◽  
Vol 23 (2) ◽  
pp. C23-C29
Author(s):  
Tibor Petrov ◽  
Ilya Finkelberg ◽  
Nina Zarkhin ◽  
Peter Počta ◽  
Ľuboš Buzna ◽  
...  
Keyword(s):  
Communication Networks ◽  
Intelligent Transportation Systems ◽  
Communication Systems ◽  
Transportation Systems ◽  
Transport Systems ◽  
Wireless Communication Systems ◽  
Intelligent Transport ◽  
Transmission Reliability ◽  
The Relationship

With the spread of connected vehicles (CVs), a growth of novel information services exploiting data transmitted by CVs is expected. Wireless communication systems, in particular in vehicular applications, operate with a varying level of transmission reliability, which may affect the quality of V2X-data-driven intelligent transport systems (ITS). Therefore, the performance of ITS should be evaluated in a variety of conditions and the configuration of parameters should be fine-tuned in a safe testbed, using computer simulations. A simple framework is presented, which couples VISSIM traffic simulation and OMNeT++ communication networks simulation in real time, enabling an assessment of the relationship between a communication reliability and transport service quality. A functionality of the framework is demonstrated by applying it to a scheme controlling signalized intersections while estimating traffic flows from the V2I data.

scholarly journals Robust Transmit Antenna Design for Performance Improvement of Cell-Edge Users: Approach of NOMA and Outage/Ergodic Capacity Analysis

Sensors ◽  
2019 ◽  
Vol 19 (22) ◽  
pp. 4907 ◽  
Author(s):  
Dinh-Thuan Do ◽  
Chi-Bao Le ◽  
Byung Moo Lee
Keyword(s):  
Closed Form ◽  
Performance Improvement ◽  
Antenna Selection ◽  
Access Point ◽  
Ergodic Capacity ◽  
Base Station ◽  
Base Stations ◽  
Closed Form Expression ◽  
Transmit Antenna Selection ◽  
Outage Performance

In this investigation, a wireless sensor network using a non-orthogonal multiple access (NOMA) system is considered in two scenarios related to the number of serving access point/base stations, where two policies provide system performance improvement in two sensors (the near user and the far user). To improve performance efficiency, two robust transmit antenna strategies are designed related to the access point/base station (BS), namely (i) Transmit Antenna Selection (TAS) mode and (ii) two base station (TBS) approach to simultaneously serve NOMA users. First, the TAS scheme is implemented to provide suboptimal outage performance for such NOMA, in which BS equipped at least two antennas while NOMA users are equippeda single antenna. Secondly, the TBS scheme is conducted to enhance the outage performance, especially considering priority evaluation for the far user in user pairs. As an important result, such far users in two proposed schemes are studied by introducing the exact closed-form expression to examine outage behavior. Accordingly, the closed-form expressions regarding ergodic capacity can be further obtained. To corroborate the exactness of these metrics, Monte Carlo simulation is performed. In addition, the proposed schemes exhibit various performance evaluations accompanied by different related parameters such as power allocation factors, the number of transmit antenna, and transmit signal-to-noise ratio (SNR).

scholarly journals HST Communication Network by Integration of Software-Defined Networking and Network Function Virtualization

2021 ◽  
Vol 9 (12) ◽  
pp. 2083-2092
Author(s):  
Arun Kumar. Ch
Keyword(s):  
Communication Systems ◽  
High Speed ◽  
Software Defined Networking ◽  
Access Point ◽  
Network Function Virtualization ◽  
Path Delay ◽  
Average Delay ◽  
Smart Transportation ◽  
Network Function ◽  
High Speed Trains

Abstract: The new challenges introduced in the wireless communication systems by the rapid developments of high-speed trains (HSTs) and more usage of the smartphones. The smart transportation involves the large crowd with smart phones, that requires a more efficient network for communication without disconnection. To achieve that, the handover process, need to be done quickly with respect to the speed of the train. To sustain its session connectivity to the internet, it requires the disconnection from the current access point (APc) to the next access point (APn). IN this project, we use the open flow and open stack protocols for integrating the interface between the infrastructure and the controller. Along with this, the integration of software-defined networking and network function virtualization is also done. The project majorly concentrated on the modification of the routes of the packet flow from one access point to the next required access point with the use of the triggering signal from the train which gives the location of the train. The suggested method works by the transmitting the signal from train to the next access point in advance so that the SDN controller changes the path of the packets to the next access point. The parameters like Signal strength, packet loss, average delay, path delay is evaluated. Along with these parameters the energy dissipation near the network also evaluated. The experimental results are evaluated using MATLAB tool. Keywords: Network Function Virtualization, OpenFlow in SDN, OpenStack, Software Defined Network.

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