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Non-orthogonal multiple access (NOMA) is a promising technology for the fifth generation. However, the increasing number of multiplexed users brings two challenges. One is the computational complexity of existing grouping schemes increases rapidly. The other is the performance of multiplexed users deteriorates sharply. To deal with these challenges, we propose a novel multi-user grouping scheme with...
Fractional Frequency Reuse (FFR) schemes are frequency allocation techniques used in cellular systems for interference mitigation and enhancing resource utilization. In this paper, analysis is presented comparing FFR and other FR algorithms under realistic network situations. Most implementations in literature considered uniform mobile placements and perfect grid models where well-defined hexagonal...
Device-to-device (D2D) is a close-range data transmission technique where users directly communicate with each other bypassing the base stations (BSs). D2D networks have been envisioned to coexist with cellular networks in an underlay manner. However, analyzing performance of D2D underlay cellular networks is non-trivial. In this paper, we quantify the average achievable throughput metric for a realistic...
The stability of links in mobile cognitive networks (MCNets) is significantly affected by primary user activities and node mobility, which makes topology control and stable routing more challenging than that in traditional wireless networks. In multi-channel multi-hop MCNets, it will become worse. In this paper, we propose a primary user activity prediction model to reveal channel utilization patterns...
Near-field coupling communication (NFCC) is a technology that uses the surface of the human body as a transmission path under 10 MHz. A human body equivalent phantom is required to obtain reproducible experimental data when we evaluate communication quality. We developed a phantom which was a vinyl chloride pipe. The pipe was filled with water including sodium chloride, the conductivity of which was...
This demonstration presents a user-friendly web-based platform that supports intuitive remote benchmarking of different indoor localization solutions. It reduces the barriers for experimental evaluation and fair comparison of their performance across a set of testing environments. The platform is aimed at addressing the limitations in the current praxis of publishing indoor localization research evaluated...
We obtain the minimum bandwidth required to meet an outage constraint in a multi-tier heterogeneous network assuming “maximum (biased) average received signal power” as the tier association metric. To do so, we model user and access point (AP) locations as Poisson point processes, and obtain the moment generating function (MGF) of the required spectrum; this analysis, in turn, is based on the cumulative...
Previous studies provided metrics to show different types of aspect coupling. However, no existing metric adequately described coupling in a way that combined the invocation of aspect advices, aspect methods, and class methods. This study introduces an invocation coupling framework that defines method-method, advice-method, and advice-advice coupling. This new framework is the basis for two new aspect...
MANET is a collection of mobile devices with a dynamically changing network topology and is devoid of any fixed infrastructure. Due to dynamic network topology, the links may appear and disappear at any time. Traditional routing protocols uses minimum hopcount as the path selection metric. However, this choice may result in long weak or low-quality links. So, defining a suitable link-metric for wireless...
The limiting impact of interference on the total throughput of large wireless networks has long been recognized by practitioners. The degrees-of-freedom characterization of interference networks has shown that the collapse in scaling without appropriate interference management is a fundamental aspect of these networks, but results from information theory were generally not applicable to network interference...
Wireless communications are subjected to radio jamming attacks due to the fact that the transmission medium is open to any hostile attackers. In a radio jamming, an attacker can jam a channel by emitting a radio signal in certain strength without understanding the protocol. It may also try to disrupt the RF operations of a communication protocol if it understands the protocol. Detection of the jamming...
In multi-tier cellular/small cell networks, decoupled uplink-downlink association (DUDe) enables a user to be associated with different base stations (BSs) for uplink (UL) and downlink (DL) transmissions. In this paper, we consider the overall UL and DL rate maximization problem of the users in such a network with a provisioning for decoupled association. In particular, we formulate the UL and DL...
In this paper, we analyze the performance of a dense small cell network with multi-antenna Base Station (BS)s employing spatial Poisson Point Process (PPP) model. In this model, the BSs and User Equipment (UE)s are distributed as two independent PPPs which are well appropriate for upcoming small cells in the next generation of wireless systems. We consider the scenario in which the small cell BSs...
An optimal energy scheme for mobile ad hoc networks (MANETs) is developed in this paper. Four elements are considered as the most important keys that influence network performance; these four elements are transmission power, interference, link lifetime, and load balance. A load balance approach is involved to distribute the traffic over available routes to address well-known problem in energy efficient...
In long-term evaluation (LTE) self-optimizing networks (SONs), load balancing is an essential part. In this paper, load unbalance problem is presented and a new game model based on cell load (BCL) is proposed. Optimal load allocated to each cell is formulated as a Nash Equilibrium, and it is proved that the new game model can improve the low system blocking probability (SBP), unsatisfied users and...
In multi-tier cellular/small cell networks, user performance is largely affected by the varying transmit powers, distances, and non- uniform traffic loads of different BSs in both the downlink (DL) and uplink (UL) directions of transmission. To optimize user performance in such networks, decoupled UL-DL association (DUDe) has recently been investigated. DUDe enables a user to be associated with different...
Capacity, survivability and power efficiency are properties of wireless networks that designers strive to increase. These goals, however, may oppose one another. This paper introduces a method in which all three goals may be pursued simultaneously in ad hoc networks through the use of a multi-objective cross entropy optimisation operating on the placement of additional nodes and transmission power...
Filter bank multicarrier (FBMC) modulation has many nice features compared with conventional cyclic prefix-based orthogonal frequency multiplexing (CP-OFDM) and has been considered as a promising waveform candidate for future 5G wireless communication. Combining FBMC with multiple-input multiple-output (MIMO) technology may achieve high data rate. In this paper, we propose the K-Best algorithm based...
The millimeter wave (mmWave) frequency band is being considered as a candidate for new radio bands that lead to capacity enhancement for emerging 5G mobile communication systems. But, in order to overcome propagation limitations of mmWave band, beamforming technology can be a solution and multi-beam based communication system using fixed beamforming is considered as a communication system structure...
In modern CMPs, Last Level Cache (LLC) is shared among cores for better utilization. Interference among data, mapped from multiple cores, increases conflict misses in shared LLCs. Such interference is highly dependent on cache behavior of applications and access rate difference among them. We observe that interference among applications is not eliminated completely even using existing state-of-the-art...
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