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Long Term Evolution (LTE) carrier aggregation with 5GHz unlicensed national informational infrastructure (UNII) band has been suggested by the industry as a good solution to handle the rapidly increasing amount of data traffic. To provide fair coexistence of LTE-licensed assisted access (LTE-LAA) and Wi-Fi on 5 GHz, several coexistence mechanisms have already been proposed. Nevertheless, as one of...
Worldwide deployed power grids have provided seamless unidirectional power supply of electricity for decades. Recently, diverse environmental factors (e.g., depletion of primary energy resources, climate change) and the heterogeneous nature of energy production are calling for new solutions. Accordingly, the Smart-NRG project proposes a modular and flexible system architecture, new technologies, and...
We study an uplink multi-user massive Multiple-Input Multiple-Output (MIMO) system employing Semi-Orthogonal Multiple-Access (SOMA) scheme. Two achievable sum-rates for the SOMA scheme are presented by use of Minimum Mean-Square Error (MMSE) channel estimation and Maximum Ratio Combining (MRC) for data detection with two detection strategies; Single-User Detection (SUD) and Successive Interference...
We consider a hybrid model of wireless networks, where nodes are able to communicate with each other and a base station as well. We use a coalitional approach for modelling the communication structures and to describe the resulting SINR values and bandwidths. We provide a framework which assumes two frequencies; one for direct communication with the base station and one for internal communication...
Automotive industry will be greatly benefited by the advent of 5G Networking and the huge boost in performance and coverage it will support. Road safety and traffic efficiency services will be significantly upgraded through seamlessly interconnected devices, while latency decrease will most likely allow autonomous driving to become a commodity, available to everyone. This technology will have a huge...
In military communication and several direction finding applications, precise estimation of the DOA, incorporated with smart beam-forming techniques, can provide useful solutions for interference mitigation and jammer identification. Compressive Sensing (CS) based DOA approaches offer a competitive advantage over the traditional DOA estimation techniques due to their ability to obtain an estimate...
Due to the high spectral efficiency of Spatial Modulation (SM) systems, an increasing attention is being paid to investigate SM as a potential candidate for future wireless transmission. Large amount of research has been dedicated for SM performance compared to the current transmission systems. However, the problem of bit to symbol mapping in SM has been rarely investigated in the literature. Unlike...
in mobile social networks, legitimate transmitting nodes can be contrasted by malicious attackers acting on the purpose of disrupting communication. Our aim is to use game theory to identify malicious nodes. With respect to previous similar formulations, we consider a wider array of action options for the players, notably we include a choice about whether to engage or not in packet exchanging, and...
Recent advances in wireless communication and electronic manufacture have allowed the creation of a variety of bio-sensors to be used for Wireless Body Area Networks (WBANs). These devices operate in close vicinity to, on or inside a human body. WBANs have gained much interest and became emerging technology in health monitoring due to its wide range of use in improving the human health. Many earlier...
This paper compares two allocation methods of bandwidth for each video traffic in multi-view video and audio transmission over bandwidth guaranteed IP networks. The methods are a main viewpoint prioritized allocation method and an equally allocation method. We assume simultaneous video transmission of multiple viewpoints. When bandwidth is insufficient for simultaneously transmitted multiple video...
Network softwarization - through the adoption of Software Defined Networking (SDN), Network Functions Virtualization (NFV) and Cloud-Fog computing technologies - is deeply impacting telecom and ICT industries. This transformation, along with numerous advantages, brings also considerable challenges. In this paper, we discuss the main features of monitoring in the afore-mentioned landscape as well as...
Unmanned Aerial Vehicles (UAVs) have been extensively studied the past years for various applications. In this work, we propose a Markov chain to model the movement of a single UAV deployed for data collection from remote sensors. Furthermore, we introduce a second Markov chain to model the irregularities of the UAV's movement when it is in transit. We investigate the impact of the distance of the...
Network Function Virtualization (NFV) has attracted a lot of attention recently both among researchers and network devices providers. By decoupling network functions from dedicated hardware devices and sharing physical network resources, NFV can allow a collection of multiple network services to run simultaneously in software modules over a shared network. However, a major challenge that needs to...
In cellular networks user equipment (UE) need to be tracked so that they can be reached by incoming data and to keep context information such as encryption keys available for UE originated transmission. Typically UEs measure reference signal transmissions that are broadcasted by the network, and report to the network based on some criterion that allows the network to know the UE location with sufficient...
Recently, cloud computing has been recognized as effective computing model, being adopted by both large corporations as well as SMEs (Small and Medium Enterprises). Due to its on-demand provisioning nature number of cloud based services are growing gradually and rapidly. The availability of open-source cloud computing platforms plays a vital role to enable researchers to go beyond state of the art...
Device-to-device (D2D) communications in cellular networks enable direct transmissions between user equipments (UEs). If the source UE (SUE) and the destination UE (DUE) are far away from each other or the channel between them is too weak for direct transmission, then multi-hop D2D communications, where relay UEs (RUEs) forward the SUE's data packets to the DUE, can be used. In this paper, we propose...
We present Hammer, a real-world, end-to-end network traffic simulator, capable of simulating complex and dynamic network, user and server behaviors. The focus of this tool is to primarily facilitate investigations related to product stability, for instance different aspects of capacity, longevity, memory leaks, cores and also handle customer content testing that will reveal the behavior of the device...
The necessity for distributed parallel multimedia processing capacity in the multimedia-aware cloud derives from the fact that it must provide both data storage and computational resources to the whole number of interconnected users. When an application or a service becomes popular, the underlying system needs to scale up efficiently thus introducing the distributed factor into the overall scheme...
In this paper, we propose a low complexity Dynamic Hybrid Clustering (DHC) scheme for LTE-A networks employing Coordinated MultiPoint with Dynamic Point Selection (CoMP-DPS). Although CoMP-DPS is considered to be a simpler CoMP scheme, its simplicity allows us to define more efficient cell clustering procedures. Thus, DHC is able to provide backhaul load balancing for the eNBs while offering high...
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