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Wireless networking and mobile communications is increasing around the world and in all sectors of our lives. With increasing use, the density and complexity of the systems increase with more base stations and advanced protocols to enable higher data throughputs. The security of data transported over the wireless networks must also evolve with the advances in technologies enabling the more capable...
Traditional cloud stacks are designed to tolerate server or rack-level failures, that are unpredictable and uncorrelated. � Such stacks successfully deliver highly-available cloud services at global scale. The increasing criticality of cloud services to the overall world economy is causing concern about the impact of power outages, cyber-attacks, configuration errors, or other causes of datacenter...
Fast acquisition sequences enable >200Hz 2D cardiac B-mode imaging with little compromise in image quality. Fast imaging minimizes frame to frame decorrelation, enabling RF-based tracking for enhanced signal-to-noise ratio (SNR) in motion and deformation imaging. Our objective was to evaluate the performance and hypothesize on the clinical usefulness of Fast RF-based Tracking (FRFT) in comparison...
This paper focuses on the implementation of a modified lightweight version of the MODBUS protocol optimized for wireless sensor networks. Here, the master and slave arrangement is made wireless using low cost and multi-featured RF modules (nRF24L01P). The modified MODBUS Packet Data Unit is sent in the data frame of the nRF24L01P. As part of the implementation in this paper the nRF24L01P's feature...
The rising adaption of Internet of Things (IoT) and Industry 4.0 is expected to boost the demands of spatially distributed embedded wireless networks. For an efficient design flow of reliable wireless communication protocol implementations, it is essential to have a testing environment, which is continuous, simple and automated at various levels in the development life cycle. This paper presents an...
This paper targets the bit error rate (BER) performance analysis of mixed radio-frequency free-space optical (RF/FSO) communication systems with a single source, single destination and multiple relays operating in the decode-and-forward (DF) mode. Several relaying scenarios are analyzed and compared for both the up-link (RF hop followed by an FSO hop) and the down-link (FSO hop followed by an RF hop)...
Some concerns are raised on the prevailing generalized covariance intersection (GCI) based Gaussian mixture probability hypothesis density (GM-PHD) fusion for distributed multiple target tracking under cluttered environments, which is both communicative and computation expensive, and generates a large amount of Gaussian components (GCs) of little physical significance. The problems become more serious...
We consider a wireless Device-to-Device (D2D) caching network, where users make arbitrary requests from a library of files and have pre-fetched (cached) information on their devices, subject to a per-node storage capacity constraint. The network is assumed to obey the “protocol model”, widely considered in the wireless network literature. Unlike other related works, which either restrict the communication...
As physical obstacles, vehicles have a significant impact on the efficient propagation of safety-related information in vehicular ad hoc networks (VANETs) by frequently obstructing the LOS link between the source and receivers. Obstructing effect of vehicles will diminish the effective coverage of broadcast as part of vehicles can not decode the broadcast successfully and incur severe impact on road...
The task to switch on 100 lights together seems rather easy, but it gets rather difficult when using established TCP/IP transport through bandwidth-restricted controls-RF connections: A convenient “time-to-light” after pushing a button should stay below 0.2 seconds. Without any optimization, the control may easily take more than 10 seconds before the action is completed. This paper addresses the timing...
Performance of RF powered communication network is bottlenecked by short downlink energy transfer range and doubly-near-far problem faced in uplink information transfer to Hybrid Access Point (HAP). Theses problems can be resolved by cooperation of an RF energy harvesting node R present between HAP and RF energy harvesting information source S. However, there lies a dilemma at R on whether to transfer...
Hybrid beamforming (BF) is a widely considered strategy to enable downlink multiuser transmission for mmWave communication systems. However, current mmWave WiFi standard, the IEEE 802.11 ad, does not support hybrid BF because it could only serve one user at a time. Thus, it is important to implement hybrid BF based on IEEE 802.11.ad such that it could be applied in future mmWave WiFi. In this paper,...
Cooperative energy relaying helps in improving the radio frequency (RF) energy transfer (ET) efficiency by harvesting the otherwise dissipated energy and then transferring it to the nearby energy receiver. The achievable RF-ET gains are strongly influenced by the relative relay placement (RP), which may cause blocking of the direct energy transfer (DET) path between RF source and receiver, or energy...
This paper describes a real-time implementation of timestamp-free network synchronization using RF signaling between a master and slave node. Rather than conventional approaches of exchanging digital timestamps through a dedicated synchronization protocol, timestamp-free synchronization is performed implicitly at the physical layer through timing of a master node's responses to a slave node. This...
In this paper, the performance of radio frequency energy harvesting system with multiple power-constrained relays over Rician/Rayleigh fading channels is studied. This considered system consists of one power and information source, multiple power-constrained relays and one destination. In order to exploit the diversity advantage of cooperative network with low computational complexity, the relays...
Underwater wireless communication is greatly attractive to explore and develop because there is a vast unexploited area under the sea. Therefore, the effect of skew is not negligible when we use sound waves in water for wireless communication. For underwater sensor or cellular networks, some time synchronization protocols which consider the skew such as Time Synchronization for High Latency (TSHL)...
In this work, we present the outage analysis for a variable gain amplify-and-forward relayed dual-hop link that comprises of a radio frequency (RF) first-hop link and a free space optical (FSO) link for the second-hop. We assume that no direct RF and FSO link exists between the source and destination nodes. The RF link experiences a composite multi-path fading and shadowing effects, and is modeled...
In this work, we address the relay selection problem for the wireless powered communication networks, where the relays harvest energy from the source radio frequency signals. A single source- destination pair is considered without a direct link. The connecting relay nodes are equipped with storage batteries of infinite size. We assume that the channel state information (CSI) on the source-relay link...
The latest IEEE WLAN 802.11ad standard guarantees the multi giga bit throughput which is highest in the Wireless LAN (WLAN) technology. The system designed for such high performance will pose enough design challenges to make them consume low power. This can however be achieved by adopting low power management and control block in the digital part of the System on Chip (SoC) like Medium Access Control...
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