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In this paper, we propose a new adaptive relay selection method named as Adaptive Best Relay Assessment (ABRA) for cooperative communication with amplify and forward (AF) relaying. ABRA is based on two relay selection criteria which are cascaded channel gain coefficient and cascaded time offset in source-relay-destination (S-R-D) channel. Our simulation results demonstrate that the channel gain coefficient...
In this paper, we introduce a mathematical framework for analyzing and optimizing multi-operator cellular networks that are allowed to share spectrum licenses and infrastructure elements. The proposed approach exploits stochastic geometry for modeling the locations of cellular base stations and for computing the aggregate average rate. The trade-offs that emerge from sharing spectrum frequencies and...
Nowadays, smart phones are considered as an essential component of our daily life. These devices can be used in social communication, mobile commerce, as a mobile office, and in many other useful applications. But these devices have serious challenges such as a short battery lifetime and a limited storage and limited processing capacities. In this regard, the cooperative cloudlet-based Mobile Cloud...
This paper focuses on the realization of cognitive antennas, not only for the automotive industry but also for handheld wireless devices like cell phones and laptops. The antenna for such applications must be able to operate in different frequency bands. For this purpose, an agile matching network is proposed, which consists of passive components that can automatically vary their values in order to...
Increasingly mobile data traffic and high quality service demand has driven fast standards development and new mobile technologies deployment. Traffic demand in 5G networks is expected to rise unprecedentedly, bringing mobile network operators (MNOs) additional challenges, and added pressure regarding carbon footprint reduction. This work aims to study the environmental and financial feasibility of...
This work investigates a problem for joint transmit beamforming and receive power splitting in multiple-input single-output downlink systems under quality of service and power transfer constraints. Rather than suppressing interference as in conventional schemes, this work takes advantage of constructive interference among users, inherent in the downlink, as a source of both useful information signal...
In this paper, existing results regarding the fundamental limits of simultaneous energy and information transmission in wireless networks are reviewed. In point-to-point channels, the fundamental limits on the information rate given a minimum energy rate constraint are fully characterized by the notion of information-energy capacity function introduced by Varshney in 2008. In a centralized multi-user...
In this paper, we consider simultaneous transmission of information and energy in a wireless network with channels undergoing frequency-selective fading. The receivers are capable of decoding the information as well as harvesting energy from the same received signal. The network employs orthogonal frequency division multiplexing (OFDM) for signal transmission. In this context, we address two different...
The Tactile Internet has highly challenging technical requirements. For example, the end-to-end latency for the sensation of touch to be realistically conveyed to the end-user via communications, for the purpose of that end-user implementing control actions in response to that touch, must be less than 1 ms. This is equivalent to only 300 km propagation at the speed of light. Such constraints mean...
In this paper, we extend proportional fair scheduling to a wireless powered communication network (WPCN) consisting of a base station (BS) and K rechargeable energy harvesting users (EHUs) that utilize dynamic time-division multiple access (D-TDMA). Each TDMA frame consists of an energy harvesting (EH) phase, which contains the RF energy broadcast by the BS, and an information transmission (IT) phase...
Vehicular ad-hoc networks (VANETs) play a crucial role in the context of smart transportation, a fundamental dimension of smart cities. Network scalability and stability are identified among the main challenges in VANETs. In response to these challenges, this paper proposes a novel direction-based clustering algorithm (DCA) for VANETs. DCA employs a well-known clustering metric in a novel manner,...
This paper analyzes closed-form outage probability of opportunistic amplify-and-forward (AF) for orthogonal frequency division multiplexing (OFDM) relaying over Rician fading environment. The opportunistic relay node is selected by maximizing signal-to-noise ratio (SNR) over all the relay nodes. In this paper, we propose a method by which a closed form outage probability approximation for opportunistic...
This paper discusses the utilization of SDN/NFV as enabling technology for the provision of in-service video quality assessment. The proposed method is based on a reduced reference extension of the widely used full reference SSIM metric, proving how the applicability of SDN/NFV can support the development of novel value-added service. The proposed video quality assessment method is based on a two-step...
Internet of Things (IoT) is now transitioning from theory to practice. This means that a lot of data will be generated and the management of this data is going to be a big challenge. To transform IoT into reality and build upon realistic and more useful services, better resource management is required at the perception layer. In this regard, Fog computing plays a very vital role. With the advent of...
Software-Defined Networking can be used to easily provision paths for business applications. However, such provisioning is static and is furthermore lost when application flows cross over to another operator domain. This paper proposes an online mechanism (SDNI) that considers application requirements and uses SDN to negotiate traffic policies between neighbouring operator domains. Hence, SDNI enables...
Quality of Experience (QoE) has become an increasing topic of research with the proliferation of multimedia services on mobile devices. Previous research studies have focused on proposing objective video quality assessment (VQA) metrics, and evaluating them on generic video content databases that consist mainly of natural clips such as news, sports and movies. This paper investigates the accuracy...
The main objective of this paper is to determine the difference in network performance between 2.1 GHz and 28 GHz frequency of operation, with and without considering higher order sectorization. The simulations are performed using “sAGA” a MATLAB based 3D ray tracing tool, an extended 3GPP antenna model and 3D building data from urban/dense urban area of Helsinki city. Three network performance metrics...
Exchanging of Situation Awareness information is extremely important for organizations in order to survive as part of the cyber domain. The situation Awareness is required for decision making and for an early warning of upcoming threats. Situation Awareness and the security information in the cyber domain differ from the kinetic domain. Because of that, Situation Awareness has different requirements...
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