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The VST-TDMA access protocol has shown to have many advantages over existing protocols in centralized (star) wireless network architectures. As most data-link layer protocols, it does not have a recovery feature as data integrity is supervised by the connection-oriented transport protocols. Nevertheless, VST-TDMA possesses the flexibility to easily incorporate a retransmission feature that allows...
The Tactile Internet refers to the communication networks that have a closed control loop of tactile input and audio and/or visual feedback. Example applications include telerehabilitation and virtual training. To ensure that these applications have unnoticeable latencies and thus satisfied quality-of-service and quality-of-experience requirements, the Tactile Internet needs to guarantee round-trip...
With the advancement in energy harvesting in terms of wireless charging techniques, it provides a novel way to solve traditional energy constraint problems in Wireless Sensor Networks (WSNs). Renewable energy such as solar, wind, and geo-thermal energy is converted to energy-storage and further use via harvest-then-transmit strategy. This article introduces a two-layer sleep scheduling system in energy-harvesting...
Applying network coding and opportunistic routing can significantly improve the throughput performance of wireless multi-hop networks, but a mismatch problem still exists among the upper flow rate, routing and lower transmission resource scheduling. This paper models the throughput optimization as a network utility function maximization in wireless multi-hop networks. By applying Lagrangian dual decomposition...
This paper introduces a new innovation for the analytical model to improve the throughput performance and energy efficiency for ideal channel conditions by the integration which challenges both fountain code and Markov chain modeling. In this context, the energy consumption is a critical resource that can be saved by minimizing the number of transmissions to be performed in the network. Channel contention...
Millimeter wave (mmWave) communication is a key enabling technology for 5G cellular systems. However, due to mmWave propagation characteristics, link length for very high rates is limited and will likely necessitate the use of relay nodes for longer-range ultra-high-speed backhaul communications. This paper investigates relay selection and scheduling to support high end-to-end throughput in mmWave...
High fluctuation of signal strength is evident in wireless channel under mobile environment. IEEE 802.11n and IEEE 802.11ac based wireless technologies experience a challenge for selecting link configuration parameters, like number of spatial streams, channel bonding, advanced modulation and coding schemes, frame aggregation etc., dynamically under mobility. Selection of the best possible data rate...
With the rapid growth of smart devices such as smartphones, tablets, and laptops, traffic demands in IEEE 802.11 wireless local area networks (WLANs) has been increased exponentially. To meet the demand, in recent years, numerous access points (APs) have been deployed in many places such as residential areas, shopping malls, airports, office and campus buildings. As the density of 802.11 WLAN increases,...
Recently, 5G systems started to explore the usage of mmWave bands both for access and backhaul. Cellular systems operating at such frequencies would achieve a significantly higher capacity than current systems due to the large frequency block available. Due to the propagation characteristics, highly directional mmWave links may frequently switch between Line-of-sight, Non Line-of-sight and outage...
Low Power Wide Area Networks (LPWAN) technologies have recently triggered many research efforts and standardization activities due to the inherent possibility of both providing long range wireless communications and guaranteeing a long life for very cheap sensing devices. At the same time, the increasing interest of telco operators into such kind of networks is due to the wide range of applications...
Energy harvesting has been gaining a lot of attention in the past decade due to its ability to provide a-virtually-endless energy supply. Nodes in a Wireless Powered Communication Network (WPCN) depend, totally or partially, on the energy harvested from the Central Node (CN) which has a constant power supply. This work addresses a solution to the problem of lack of fairness in the distribution of...
Automation of modern industrial plants require real-time tracking of object locations and sensing of local and ambient parameters for variety of applications such as counting and tracking of objects in assembly line, detection and positioning of failures of machines etc. Mostly, discrete Real Time Location System (RTLS) performs object tracking in existing industrial automation without its integration...
This paper considers a fast fading wireless powered wiretap channel, where an energy constrained information source, powered by a dedicated power beacon, sends a secret message to a legitimate user using the artificial noise (AN) scheme in the presence of a passive eavesdropper. Based on a two-phase time division protocol, the ergodic secrecy throughput is derived. Furthermore, the optimal time-switching...
This paper investigates resource allocation in a multi-user, multi-band and multi-antenna equipped wireless communication system, which is used for simultaneous wireless information and power transmission (SWIPT). The optimization problems of sum-rate over multiple sub-bands subject to the power spectral density requirement (PSDR) limit and the circuit power requirement (CPR) are studied in the case...
Simultaneous wireless information and power transfer (SWIPT) is an effective way for energy-constrained unmanned aerial vehicle (UAV) to prolong the network lifetime. In this paper, an amplify and forward (AF) relaying network is considered, where an energy-constrained UAV harvests energy and information simultaneously from base station and then transmits the information to the destination node. Based...
Ambient backscatter is a new technology that utilizes environmental wireless signals to enable battery-free devices to communicate with each other. In this paper, we investigate the problem of signal detection for the full duplex wireless system utilizing ambient backscatter. Since one of the key technologies of full duplex wireless system is self-interference cancellation, we first estimate the channel...
In this paper, we analyze the TCP Cubic throughput performance over a Nakagami-m slow-fading wireless channel with impacts of adaptive modulation and coding (AMC) schemes. The loss event, which includes a transport-layer congestion loss and physical-layer random packet loss is first analyzed thanks to corresponding finite-state Markov models. The average normalized throughput can be, thus, calculated...
The emergence of 5G wireless communication calls for new paradigms to satisfy the individuation and diversification of users' demands. In this paper, we construct the multicast groups under the guidance of user interest and then allocate the subcarriers and power to these groups in orthogonal frequency division multiple (OFDM) networks. Specifically, in order to maximize the social utility related...
WiGig enables wireless multi-gigabit communication over 60GHz band. However, its usage scenarios may be constrained by two major limitations: line-of-sight propagation and very short transmission range. We seek to boost the WiGig's usability by using WiFi to complement its limitations in tri-band (2.4/5/60GHz) wireless systems. Our goal is to let a tri-band client have multimedia services at the WiGig's...
The association of wireless clients based on the Received Signal Strength Indication (RSSI) does not necessarily result in better network performance. An Access Point (AP), even presenting high signal level to clients, can be so congested that a new association degrades network performance. By using the Software Defined Wireless Networking (SDWN) paradigm, this work presents a centralized solution...
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