Wyniki wyszukiwania dla: Mihail L. Sichitiu

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Towards acoustic localization for biobotic sensor networks

Hong Xiong, Talha Agcayazi, Tahmid Latif, Alper Bozkurt, więcej

2017 IEEE SENSORS > 1 - 3

2017 IEEE SENSORS

A cyberphysical network of insect biobots or biological robots could aid first-responders for search-and-rescue applications in uncertain disaster environments. In such networks, the nodes are insect biobots equipped with miniature backpacks utilizing a system-on-chip. These applications demand fine-grained, real-time localization of the sensor nodes. In this paper, we use a combination of radio-frequency...

rozdział

Evaluating the Accuracy of Vehicular Channel Models in a Large-Scale DSRC Test

Scott E. Carpenter, Mihail L. Sichitiu

2017 IEEE 14th International Conference on Mobile Ad Hoc and Sensor Systems (MASS) > 241 - 249

2017 IEEE 14th International Conference on Mobile Ad Hoc and Sensor Systems (MASS)

Vehicle-to-vehicle channel characteristics differ significantly from those of conventional cellular channels, especially in terms of fading statistics due to varying environmental conditions, link types, vehicle types, and objects that result in complex propagation effects. Accurate modeling of the vehicular channel remains a complex challenge. In this paper, existing, common vehicular channel models...

artykuł

Temperature compensated Kalman distributed clock synchronization

Fengyuan Gong, Mihail L. Sichitiu

Ad Hoc Networks > 2017 > 62 > C > 88-100

Time synchronization is a fundamental problem in any distributed system. In particular, wireless sensor networks (WSNs) require scalable time synchronization for implementing distributed tasks on multiple sensor nodes. We propose a temperature-compensated Kalman based distributed synchronization protocol (TKDS) using a two-way sender-receiver synchronization scheme, to achieve high synchronization...

artykuł

NEAT: Network link emulation with adaptive time dilation

Hee Won Lee, Mihail L. Sichitiu, David Thuente

Journal of Parallel and Distributed Computing > 2017 > 104 > C > 88-98

In evaluating the performance of highly complex networked systems, emulation is often used as it maintains much of the realism of testbeds, while offering increased flexibility and scalability. In large emulation systems, multiple and heterogeneous virtual machines can be deployed in relatively few general purpose physical hosts. Time dilation is a technique that allows virtual time to pass at a different...

artykuł

On the Accuracy of Pairwise Time Synchronization

Fengyuan Gong, Mihail L. Sichitiu

IEEE Transactions on Wireless Communications > 2017 > 16 > 4 > 2664 - 2677

Time synchronization is a fundamental problem in any distributed system. In particular, wireless sensor networks require scalable time synchronization for implementing distributed tasks on multiple sensor nodes. Different synchronization schemes and hardware systems are able to achieve widely different levels of synchronization accuracy. Since synchronization accuracy is very sensitive to random delays...

rozdział

Analysis of packet loss in a large-scale DSRC field operational test

Scott E. Carpenter, Mihail L. Sichitiu

2016 International Conference on Performance Evaluation and Modeling in Wired and Wireless Networks (PEMWN) > 1 - 6

2016 International Conference on Performance Evaluation and Modeling in Wired and Wireless Networks (PEMWN)

Dedicated Short-Range Communication (DSRC) intends to improve transportation safety by using wireless technology to allow vehicles to exchange safety-awareness message between them. Using a large empirical dataset collected from a field operational test of nearly 3000 vehicles operating around Ann Arbor, Michigan, we characterize the packet-level performance of safety messages exchanged among vehicular...

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KickLoc: Simple, Distributed Localization for Wireless Sensor Networks

Hong Xiong, Mihail L. Sichitiu

2016 IEEE 13th International Conference on Mobile Ad Hoc and Sensor Systems (MASS) > 228 - 236

2016 IEEE 13th International Conference on Mobile Ad Hoc and Sensor Systems (MASS)

The emergence of location-based applications in wireless sensor network has galvanized extensive research on localization. Nonetheless, localization remains a difficult problem due to trade-offs between accuracy, energy consumption and computing resources. Searching for a solution that is sufficiently robust to handle a variety of scenarios, we propose KickLoc, which is a fully distributed solution...

artykuł

CESP: A Low-Power High-Accuracy Time Synchronization Protocol

Fengyuan Gong, Mihail L. Sichitiu

IEEE Transactions on Vehicular Technology > 2016 > 65 > 4 > 2387 - 2396

Time synchronization is a fundamental problem in any distributed system. In particular, wireless sensor networks (WSNs) require scalable time synchronization for implementing distributed tasks on multiple sensor nodes. We propose an energy-efficient coefficient exchange synchronization protocol (CESP) based on a receiver–receiver synchronization scheme, which minimizes the impact of access-time delays...

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Mobility Models for Ad Hoc Networks

Mihail L. Sichitiu

Computer Communications and Networks > Guide to Wireless Ad Hoc Networks > 237-254

Network simulators emerged as the most common method of evaluating the performance of large and complex networking systems. However, for systems involving mobile nodes, the movement of the mobile nodes has a significant influence on the results of the simulation. Therefore, in the past decade, a significant amount of research was devoted to develop mobility models suitable for evaluating the performance...

rozdział

Contact Time in Random Walk and Random Waypoint: Dichotomy in Tail Distribution

Chen Zhao, Mihail L. Sichitiu

Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering > Ad Hoc Networks > 1st ICST International Conference on Ad Hoc Networks > 333-348

Contact time (or link duration) is a fundamental factor that affects performance in Mobile Ad Hoc Networks. Previous research on theoretical analysis of contact time distribution for random walk models (RW) assume that the contact events can be modeled as either consecutive random walks or direct traversals, which are two extreme cases of random walk, thus with two different conclusions. In this paper...

rozdział

Characterization of RSS variability for biobot localization using 802.15.4 Radios

Hong Xiong, Tahmid Latif, Edgar Lobaton, Alper Bozkurt, więcej

2016 IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNet) > 1 - 3

2016 IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNet)

A cyber-physically organized swarm of insect biobots or biological robots can aid first responders in search-and-rescue scenarios after natural disasters or earthquakes by establishing an under-rubble sensor network. In such a network, the nodes are represented by the insect biobots equipped with electronic backpacks utilizing a system-on-chip. This application requires effective real-time localization...

rozdział

Towards enabling hyper-responsive mobile apps through network edge assistance

Miguel Baguena, George Samaras, Andreas Pamboris, Mihail L. Sichitiu, więcej

2016 13th IEEE Annual Consumer Communications & Networking Conference (CCNC) > 399 - 404

2016 13th IEEE Annual Consumer Communications & Networking Conference (CCNC)

Poor Internet performance currently undermines the efficiency of hyper-responsive mobile apps such as augmented reality clients and online games, which require low-latency access to real-time backend services. While edge-assisted execution, i.e. moving entire services to the edge of an access network, helps eliminate part of the communication overhead involved, this does not scale to the number of...

artykuł

Optimal Resource Allocation in Random Access Cooperative Cognitive Radio Networks

Mani Bharathi Pandian, Mihail L. Sichitiu, Huaiyu Dai

IEEE Transactions on Mobile Computing > 2015 > 14 > 6 > 1245 - 1258

Cooperative cognitive radio networks (CCRNs) incorporates cooperative communication into cognitive radio networks, in which, primary users lease their spectrum to secondary users, and in exchange, the primary users leverage secondary users as cooperative relays to enhance their own throughput. Mobile operators offload their Internet traffic to privately owned Wi-Fi access points (APs), much to the...

artykuł

MCAS-MAC: A multichannel asynchronous scheduled MAC protocol for wireless sensor networks

Jun Bum Lim, Beakcheol Jang, Mihail L. Sichitiu

Computer Communications > 2015 > 56 > Complete > 98-107

Due to their energy efficiency, many duty cycling-based MAC protocols have been proposed in WSNs. Although these protocols considerably reduce energy consumption by minimizing idle listening and overhearing, the energy efficiency comes at the cost of decreased packet delivery ratio and increased delay. In this paper, we present a multichannel asynchronous scheduled MAC protocol, called MCAS-MAC, which...

rozdział

CESP: A power efficient, accurate coefficient exchange synchronization protocol

Fengyuan Gong, Mihail L. Sichitiu

IEEE International Conference on Wireless for Space and Extreme Environments > 1 - 6

2013 IEEE International Conference on Wireless for Space and Extreme Environments (WiSEE)

Time synchronization is a fundamental problem in any distributed system. In particular, wireless sensor networks require scalable time synchronization for implementing distributed tasks on multiple sensor nodes. This paper proposes an energy efficient Coefficient Exchange Synchronization Protocol (CESP) based on a receiver-receiver synchronization scheme that minimizes the impact of access-time delays...

artykuł

An asynchronous scheduled MAC protocol for wireless sensor networks

Beakcheol Jang, Jun Bum Lim, Mihail L. Sichitiu

Computer Networks > 2013 > 57 > 1 > 85-98

Wireless sensor networks (WSNs) comprise a number of autonomous sensors and one or more sinks to cooperatively monitor physical or environmental conditions. Energy efficiency is a key design factor of a MAC protocol for WSNs. Due to the importance of the problem, a number of energy efficient MAC protocols have been developed for WSNs. Preamble-sampling based MAC protocols (e.g., B-MAC and X-MAC) have...

artykuł

IEEE 802.11 Saturation Throughput Analysis in the Presence of Hidden Terminals

Beakcheol Jang, Mihail L. Sichitiu

IEEE/ACM Transactions on Networking > 2012 > 20 > 2 > 557 - 570

Due to its usefulness and wide deployment, IEEE 802.11 has been the subject of numerous studies, but still lacks a complete analytical model. Hidden terminals are common in IEEE 802.11 and cause the degradation of throughput. Despite the importance of the hidden terminal problem, there have been a relatively small number of studies that consider the effect of hidden terminals on IEEE 802.11 throughput,...

rozdział

Hybrid resource allocation scheme in two-hop relaying WiMAX networks

Yongchul Kim, Mihail L. Sichitiu

2012 International Conference on Computing, Networking and Communications (ICNC) > 1144 - 1148

2012 International Conference on Computing, Networking and Communications (ICNC)

In this paper, we consider resource allocation schemes in two-hop relaying WiMAX networks in order to maximize cell throughput, while serving the subscriber stations (SSs) in a fair manner. First we present two well-known schemes, namely, orthogonal and overlapped, according to the frequency reuse during the access zone intervals of downlink and uplink subframes. We then propose a hybrid resource...

rozdział

Optimal resource allocation in multihop relay-enhanced WiMAX networks

Yongchul Kim, Mihail L Sichitiu

2011 IEEE Wireless Communications and Networking Conference > 737 - 742

2011 IEEE Wireless Communications and Networking Conference (WCNC 2011)

Multihop relaying in WiMAX networks is considered an increasingly attractive technology for providing throughput enhancement, coverage extension, or both. In this paper, we consider deploying non-transparent relay stations (RSs) that transmit on the same carrier frequency as the base station (BS) for the purpose of coverage extension. Since it is possible that the RSs and BS are transmitting/receiving...

artykuł

Contact time in random walk and random waypoint: Dichotomy in tail distribution

Chen Zhao, Mihail L. Sichitiu

Ad Hoc Networks > 2011 > 9 > 2 > 152-163

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