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We analyze the outage performance of relay selection in two-way full-duplex amplify-and-forward cooperative systems in the presence of residual loop-interference (LI) over Nakagami-m fading channels. In the proposed system, a relay node is selected according to max-min policy and the physical-layer-network-coding technique is applied for two-way transmission. By using end-to-end signal-to-interference-plus-noise-ratio,...
In this paper, we propose a maximum likelihood estimator for received signal strength (RSS) based indoor localization systems by exploiting gamma shadow fading model. In order to investigate the validity of proposed method in a realistic environment, we develop a testbed based on Wi-Fi technology. Through experimental analyses, we first demonstrate the gamma distribution is a good fit to lognormal...
We investigate outage performance of fixed-gain and variable-gain amplify-and-forward (AF) full-duplex (FD) relaying systems under residual loop-interference (LI) in non-identical Nakagami-m fading channels. New exact outage probability expressions are derived analytically in a single-integral form by using the cumulative distribution function approach. Moreover, tight lower-bound and asymptotic outage...
Performance of received signal strength (RSS) based localization techniques are directly related to the employed RSS model. Hence, localization performance can be enhanced by improving the accuracy of the RSS model. Lognormal mixture shadowing model for wireless channels, generated by taking distinct scattering clusters into account, characterizes RSS variable more accurately than classical lognormal...
Heterogeneity is one of the most significant features of next generation (5G) wireless networks. The spatial distribution of users in heterogeneous networks (HetNets) impacts the system performance. Currently it is often assumed that spatial users are uniformly distributed, i.e. Poisson point process (PPP). A more realistic user distribution model is a Poisson cluster process (PCP) because current...
Using drones as flying base stations is a promising approach to enhance the network coverage and area capacity by moving supply towards demand when required. However deployment of such base stations can face some restrictions that need to be considered. One of the limitations in drone base stations (drone-BSs) deployment is the availability of reliable wireless backhaul link. This paper investigates...
Low transmit power base stations (BSs) with flexible cell extension are included in wireless networks in order to support hot spots and cell edge coverage. Densification of different kind of BSs is one of the most important features of fifth generation (5G) cellular networks. Evaluation of the system performance in heterogeneous cellular networks is a crucial topic. In the literature, many papers...
In heterogeneous networks (HetNets) users are usually distributed non-uniformly. Analysis of the impact of nonuniformity of user distribution on HetNets is essential for designing efficient networks. This paper proposes a non-uniform user distribution model in which the user density depends on the distance to the associated base stations (BSs). Moreover, different tiers, such as macro cells, pico...
Wireless networks will become more heterogeneous in next generation (5G). We need good models for the spatial distribution of base station (BS) and user equipment (UE) to perform accurate analysis of heterogeneous networks (hetnets). The literature on hetnets UE modeling that includes spatial dependency is still rather limited. In this paper, we introduce a nonuniformly distributed UE model based...
Using drone base stations (drone-BSs) in wireless networks has started attracting attention. Drone-BSs can assist the ground BSs in both capacity and coverage enhancement. One of the important problems about integrating drone-BSs to cellular networks is the management of their placement to satisfy the dynamic system requirements. In this paper, we propose a method to find the positions of drone-BSs...
In this paper, performance of two-way full-duplex cooperative systems under residual loop- interference (LI) is analyzed in terms of outage probability over Nakagami-$m$ fading channels. At the relay node of the proposed system, physical- layer-network-coding technique and variable-gain full-duplex amplify-and-forward relaying method are combined for two-way transmission. End-to-end signal-to-interference-plus-noise-ratio...
Increasing speed of digital equipment moves the electromagnetic compatibility (EMC) studies into a new point due to their broadband radiated emission characteristics. Beside preventing interception from electromagnetic radiation, it is desirable to identify the information source from the radiated emissions. In this paper, we analyzed the sources of the differences among LCD emanations by checking...
Information might be leaked through electromagnetic radiation from a computer display. Radiation containing information and radiation without information should be treated differently. Therefore, a novel algorithm has been developed to determine whether or not information is leaked in electromagnetic radiation. Motivated by the observation that the Gabor coefficients of information part and the non-information...
Computer displays emit electromagnetic waves, which compromise the information displayed by the computer. This can be a potential information security threat as the sensitive information can be stolen from a distance without leaving any trace. The video leakage signals contain the information of the image displayed in the computer, so the video leakage signals can be seen as special image signals...
Electromagnetic radiation signals from computer displays can be a computer security risk if the radiation signal is intercepted and reconstructed. In addition to the information displayed by the computer, electromagnetic radiation leaks the information of the computer itself which is more important for some attackers, protectors and security inspection workers. In this paper, we demonstrate that electromagnetic...
In this paper, outage performance of full duplex physical layer network coding systems under residual self-interference over Nakagami-m fading channels is investigated. Physical layer network coding technique and amplify-and-forward method with variable-gain relaying are used at the relay node of the proposed system. End-to-end signal-to-interference-plus-noise-ratio is derived for the equal power...
Using the hexagonal grid based two-interferer model we derive a simple analytical expression for the max-SIR conditional outage probability in an interference-limited cellular network. The derived probability is compared to the one that is obtained by simulation from the 19 base stations two-ring hexagonal grid. The comparison reveals that the derived probability matches the actual one to within 0–2...
In cellular networks, cells are divided into sectors, each containing its own directional antenna. Although localization systems is a major research topic, in all conducted studies, contrary to the existing network structures, the use of omni-directional antennas is assumed. In this study, an extended received signal strength (RSS) model is proposed to be able to analyze the effects of directional...
In this study, we investigate the outage performance of full-duplex fixed-gain amplify-and-forward (AF) relaying systems over Rayleigh fading channels. New exact outage probability expression of full-duplex fixed-gain AF relaying is derived analytically in single-integral form by using the cumulative distribution function (CDF) approach. The analytical results for outage performance are verified by...
In wireless communication systems, finding a model to describe shadow fading that is easy-to-work and has a good fidelity with the observed phenomena is a topic that is receiving the attention of several studies. This is because the well-known lognormal model, discussed in the literature, does not describe accurately what is experienced in the real world. Because gamma distribution has closed form...
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