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Carleton University
(159 results)-
White Papers
Exploration and Field Study of a Browser-Based Password Manager Using Icon-Based Passwords
April 26, 2011, 12:00am PDT
They carry out a hybrid lab and field study of a password manager program, and report on usability and security. The paper explores iPMAN, a browser-based password manager that in addition uses a...
Provided by Carleton University
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White Papers
Enhancing Web Page Security With Security Style Sheets
February 10, 2011, 12:00am PST
Although the web security community now has a variety of techniques that could help web developers to defend against common attacks such as cross-site scripting and cross-site request forgery,...
Provided by Carleton University
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White Papers
Persuasive Cued Click-Points: Design, Implementation, and Evaluation of a Knowledge-Based Authentication Mechanism
February 20, 2011, 12:00am PST
This paper introduces and presents the results of a systemic study of the Persuasive Cued Click-Points graphical password scheme, including usability and security evaluations, and implementation...
Provided by Carleton University
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White Papers
Influencing Users Towards Better Passwords: Persuasive Cued Click-Points
September 19, 2007, 12:00am PDT
Usable security has unique usability challenges because the need for security often means that standard human-computer-interaction approaches cannot be directly applied. An important usability...
Provided by Carleton University
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White Papers
Graphical Password Authentication Using Cued Click Points
April 10, 2007, 12:00am PDT
The authors propose and examine the usability and security of Cued Click Points (CCP), a cued-recall graphical password technique. Users click on one point per image for a sequence of images. The...
Provided by Carleton University
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White Papers
Evaluation of Anonymized ONS Queries
November 23, 2009, 12:00am PST
Electronic Product Code (EPC) is the basis of a pervasive infrastructure for the automatic identification of objects on supply chain applications (e.g., pharmaceutical or military applications)....
Provided by Carleton University
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White Papers
Agents Of Globality: The Role Of Cultural Intermediaries In The Wine Markets Of Japan And Singapore
August 27, 2010, 12:00am PDT
Wine serves as a significant marker of societal, and market change in societies which are not traditionally wine drinking. Thus, there is an opportunity to look at those individuals who serve to...
Provided by Carleton University
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White Papers
TDMA Scheduling for Data Gathering In Wireless Sensor Networks
May 17, 2008, 12:00am PDT
The authors consider wireless sensor networks where a number of unconstrained nodes (Access Points) with unlimited power source can be deployed together with constrained and limited energy sensor...
Provided by Carleton University
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White Papers
Open Source Spam Filtering
April 23, 2008, 12:00am PDT
Spam is an expensive problem for enterprises because it not only poses a threat to their internal computing environments but also requires a significant investment in filtering technology. With...
Provided by Carleton University
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White Papers
CROO: A Universal Infrastructure and Protocol to Detect Identity Fraud
July 13, 2008, 12:00am PDT
IDentity Fraud (IDF) may be defined as unauthorized exploitation of credential information through the use of false identity. The authors propose CROO, a universal (i.e. generic) infrastructure...
Provided by Carleton University
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White Papers
Exploring User Reactions to New Browser Cues for Extended Validation Certificates
July 15, 2008, 12:00am PDT
With the introduction of Extended Validation SSL certificates in Internet Explorer 7.0, web browsers are introducing new indicators to convey status information about different types of...
Provided by Carleton University
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White Papers
On Sustaining Economic Growth Over The Long Term
April 1, 2009, 12:00am PDT
This paper investigates the problem of sustaining economic growth, viewed from the perspective of how growth is affected by government policy choices as well as by the nature of government....
Provided by Carleton University
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White Papers
Topology Control and Routing in Mobile Ad Hoc Networks With Cognitive Radios
May 1, 2011, 12:00am PDT
Cognitive Radio (CR) technology will have significant impacts on upper layer performance in Mobile Ad hoc NETworks (MANETs). In this paper, the authors study topology control and routing in...
Provided by Carleton University
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Whitepapers
Preventing the Cluster Formation Attack Against the Hierarchical OLSR Protocol
August 22, 2012, 12:00am PDT
The Hierarchical Optimized Link State Routing (HOLSR) protocol enhances the scalability and heterogeneity of traditional OLSR-based Mobile Ad-Hoc NETworks (MANETs). It organizes the network in...
Provided by Carleton University
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Whitepapers
System and Application Knowledge Based Scheduling of Multiple Applications in a WSN
May 24, 2012, 12:00am PDT
The paper concerns a Wireless Sensor Network (WSN) hosting multiple applications. The applications vary in terms of their resource requirements such as the number of sensors required by the...
Provided by Carleton University
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Whitepapers
MAC Performance Improvement in UAV Ad-Hoc Networks With Full-Duplex Radios and Multi-Packet Reception Capability
May 24, 2012, 12:00am PDT
Recent advances in interference cancellation and signal processing techniques can enable full-duplex radios and multi-packet reception (MPR) capability, which will have significant impacts on the...
Provided by Carleton University
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Whitepapers
A Token-Based Connectivity Update Scheme for Unmanned Aerial Vehicle Ad Hoc Networks
May 24, 2012, 12:00am PDT
Code Division Multiple Access Mobile Ad hoc NETworks (CDMA-MANETs) are envisioned to be the next generation networking architecture for networking military platforms in a battlefield. In this...
Provided by Carleton University
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Whitepapers
Service Availability Analysis in Communication-Based Train Control (CBTC) Systems Using WLANs
May 24, 2012, 12:00am PDT
Data communication technology is one of the key subsystem in Communication-Based Train Control (CBTC), which is an automated train control system for railways that ensures safe operation of rail...
Provided by Carleton University
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Whitepapers
Network Coding Based Wideband Compressed Spectrum Sensing
May 24, 2012, 12:00am PDT
One of the fundamental components in Cognitive Radios (CRs) is spectrum sensing. For sensing the wide range of frequency bands, CRs need high sampling rate Analog to Digital Converters (ADCs)...
Provided by Carleton University
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Whitepapers
Flow Availability Analysis in Two-Layer Networks With Dedicated Path Protection at the Upper Layer
May 24, 2012, 12:00am PDT
The authors propose an analytical model that computes availability of upper-layer flows in two-layer networks with dedicated path protection deployed at the upper layer. Their proposed model...
Provided by Carleton University
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Whitepapers
Optimal Server Assignment in Multi-Server Parallel Queueing Systems With Random Connectivities and Random Service Failures
May 24, 2012, 12:00am PDT
The problem of assignment of K identical servers to a set of N symmetric parallel queues is investigated in this paper. The parallel queueing system is considered to be time slotted and the...
Provided by Carleton University
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Whitepapers
Iterative Recovery Algorithms for Compressed Sensing of Wideband Block Sparse Spectrums
May 24, 2012, 12:00am PDT
In a wireless communication environment, many of the Primary Users (PUs) do not use their licensed frequency bands at all times. The surveys show that the maximum frequency utilization of the...
Provided by Carleton University
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Whitepapers
Bottom-Up Trie Structure for P2P Live Streaming
May 24, 2012, 12:00am PDT
By simultaneously providing live video and audio contents to millions of users around the world, Peer-To-Peer Live Video Streaming (P2P LVS) has become one of the most popular Internet...
Provided by Carleton University
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Whitepapers
Optimizing the Monitoring Path Design for Independent Dual Failures
May 24, 2012, 12:00am PDT
This paper proposes a new monitoring path design paradigm for independent dual link failures. Specifically, the new approach exploits the sequential arrival and departure property of independent...
Provided by Carleton University
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Whitepapers
Broadcasting in Multihop Wireless Networks: the Case for Multi-Source Network Coding
May 24, 2012, 12:00am PDT
Network Coding, in particular Random Linear Network Coding, has been extensively researched for communication in multihop wireless networks, such as MANETs. A key aspect of random linear network...
Provided by Carleton University
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Whitepapers
Joint Routing, Scheduling and Power Allocation in OFDMA Wireless Ad Hoc Networks
May 24, 2012, 12:00am PDT
In this paper an OFDMA-based wireless ad hoc network is considered. In addition to the potential of being a source and/or a destination, each node is assumed to be capable of decoding and...
Provided by Carleton University
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Whitepapers
Coordinated Max-Min Fair Port Selection in a Multi-Cell Distributed Antenna System Using Semidefinite Relaxation
May 24, 2012, 12:00am PDT
The authors consider the downlink of a cellular system in which each Base Station (BS) has multiple distributed antenna ports that are geographically dispersed over the cell. The goal of the BSs...
Provided by Carleton University
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Whitepapers
Joint Replay Detection in Tactical Networks
May 24, 2012, 12:00am PDT
Replay attacks and their associated risks in mobile tactical networks are analyzed and a cooperative joint detection scheme is evaluated. The scheme adopts a combination of duplicated frame...
Provided by Carleton University
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Whitepapers
Similarity of Polygonal Curves in the Presence of Outliers
December 10, 2012, 12:00am PST
The Frechet distance is a well studied and commonly used measure to capture the similarity of polygonal curves. Unfortunately, it exhibits a high sensitivity to the presence of outliers. Since the...
Provided by Carleton University
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Whitepapers
QoS Provisioning for Multimedia Transmission in Cognitive Radio Networks
April 29, 2011, 12:00am PDT
In Cognitive Radio (CR) networks, the perceived reduction of application layer Quality of Service (QoS), such as multimedia distortion, by secondary users may impede the success of CR...
Provided by Carleton University
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Whitepapers
Turbo Receiver Design for MIMO Relay ARQ Transmissions
September 17, 2012, 12:00am PDT
In this paper, the authors investigate practical turbo receiver design for throughput-efficient relay ARQ transmissions over broadband cooperative MIMO channels. Their setup is comprised of three...
Provided by Carleton University
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Whitepapers
A Genetic Algorithm Based Cell Switch-Off Scheme for Energy Saving in Dense Cell Deployments
September 17, 2012, 12:00am PDT
The energy consumption of mobile networks is rapidly growing; operators have both economic and environmental incentives to increase the energy efficiency of their networks. One way of saving...
Provided by Carleton University
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Whitepapers
Efficiently Computable Bounds on the Rates Achieved by a Cross Layer Design With Binary Scheduling in Generic OFDMA Wireless Networks
September 17, 2012, 12:00am PDT
Future broadband communication networks are expected to be OFDMA-based with generic ad hoc topologies, wherein the wireless nodes play multiple roles, including transmission, reception and...
Provided by Carleton University
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Whitepapers
A Decoding Procedure for Compress-and-Forward and Quantize-and-Forward Relaying
October 4, 2012, 12:00am PDT
In this paper, a decoding procedure is developed for both the Compress-and-Forward (CF) and the Short Message Quantize-and-Forward (QF-SM) relaying schemes. This procedure is based on exploiting a...
Provided by Carleton University
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Whitepapers
Grassmannian Signalling Achieves the Ergodic High SNR Capacity of the Non-Coherent MIMO Relay Channel Within an SNR-Independent Gap
November 9, 2012, 12:00am PST
This paper considers the ergodic non-coherent capacity of a multiple-input multiple-output frequency-flat block Rayleigh fading relay channel. It is shown that for this channel restricting the...
Provided by Carleton University
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Whitepapers
Optimal Tradeoff Between Efficiency and Jain's Fairness Index in Resource Allocation
September 18, 2012, 12:00am PDT
In several systems, including wireless communication ones, certain services, which are referred to as benefits, are provided to multiple users based on the allocation of shared resources that are...
Provided by Carleton University
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Whitepapers
Rate-Per-Link Adaptation in Cooperative Wireless Networks With Multi-Rate Combining
September 22, 2008, 12:00am PDT
Rate adaptation based on Signal-to-Noise Ratio (SNR) measurements is a common channel adaptation scheme to increase throughput in wireless communication systems. In this paper, the authors analyze...
Provided by Carleton University
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Whitepapers
Dynamic Operation of BSs in Green Wireless Cellular Networks Powered by the Smart Grid
November 21, 2012, 12:00am PST
There is great interest in considering the energy efficiency aspect of wireless cellular networks. When a wireless cellular network is powered by the smart grid, only considering energy efficiency...
Provided by Carleton University
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Whitepapers
Dynamic Energy-Efficient Resource Allocation in Cognitive Heterogeneous Wireless Networks With the Smart Grid
November 21, 2012, 12:00am PST
Rapidly rising energy costs and increasingly rigid environmental standards have led to an emerging trend of addressing the "Energy efficiency" aspect of wireless cellular networks. In cellular...
Provided by Carleton University
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Whitepapers
Co-channel Interference Cancellation in Wireless Cellular Networks
April 15, 2008, 12:00am PDT
In this paper, the authors study the benefits of using iterative multi-user detectors for co-channel interference suppression in wireless cellular systems. they show that with a single receive...
Provided by Carleton University
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White Papers
Improving Text Passwords Through Persuasion
July 25, 2008, 12:00am PDT
Password restriction policies and advice on creating secure passwords have limited effects on password strength. Influencing users to create more secure passwords remains an open problem. The...
Provided by Carleton University
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White Papers
Usability of Anonymous Web Browsing: An Examination of Tor Interfaces and Deployability
July 20, 2007, 12:00am PDT
Tor is a popular privacy tool designed to help achieve online anonymity by anonymising web traffic. Employing cognitive walkthrough as the primary method, this paper evaluates four competing...
Provided by Carleton University
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White Papers
Cross Layer Scheduling Algorithms for Different Rate Traffic in OFDM Broadband Wireless Systems
October 1, 2009, 12:00am PDT
Cross layer optimization plays a key role in radio resource management of Broadband Wireless Systems (BWS). Maximal SNR (MaxSNR) and Round Robin (RR) are two conventional scheduling strategies...
Provided by Carleton University
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White Papers
Towards Understanding Network Traffic Through Whole Packet Analysis
October 30, 2007, 12:00am PDT
The authors present ADHIC, an algorithm that hierarchically clusters network traffic without making assumptions about the structure of packets. Packets are judged similar using patterns of n-byte...
Provided by Carleton University
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White Papers
Lightweight Hierarchical Clustering of Network Packets Using (p,N)-Grams
November 1, 2008, 12:00am PDT
The complexity of current Internet applications makes understanding network traffic a challenging task. By providing larger-scale aggregates for analysis, unsupervised clustering approaches can...
Provided by Carleton University
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White Papers
Self-Signed Executables: Restricting Replacement of Program Binaries by Malware
August 3, 2007, 12:00am PDT
The authors propose using digital signatures to protect binaries already on the system from modifications by malware. While applicable to any file which is not intended to be modified by an end...
Provided by Carleton University
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White Papers
Addressing SMTP-Based Mass-Mailing Activity Within Enterprise Networks
November 5, 2007, 12:00am PST
Malicious mass-mailing activity on the Internet is a serious and continuing threat that includes mass-mailing worms, spam, and phishing. A mechanism commonly used to deliver such malicious mass...
Provided by Carleton University
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White Papers
Discovering Packet Structure Through Lightweight Hierarchical Clustering
February 27, 2008, 12:00am PST
The complexity of current Internet applications makes the understanding of network traffic a challenging task. By providing larger-scale aggregates for analysis, unsupervised clustering approaches...
Provided by Carleton University
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White Papers
NetADHICT: A Tool for Understanding Network Traffic
October 17, 2007, 12:00am PDT
Computer and network administrators are often confused or uncertain about the behavior of their networks. Traditional analysis using IP ports, addresses, and protocols are insufficient to...
Provided by Carleton University
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White Papers
Probabilistic Localization and Tracking of Malicious Insiders Using Hyperbolic Position Bounding in Vehicular Networks
April 1, 2009, 12:00am PDT
A malicious insider in a wireless network may carry out a number of devastating attacks without fear of retribution, since the messages it broadcasts are authenticated with valid credentials such...
Provided by Carleton University
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White Papers
Communication in Wireless Networks With Directional Antennae
January 18, 2008, 12:00am PST
The authors study the problem of maintaining connectivity in a wireless network where the network nodes are equipped with directional antennae. Nodes correspond to points on the plane and each...
Provided by Carleton University
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White Papers
Routing on Delay Tolerant Sensor Networks
June 5, 2009, 12:00am PDT
Delay (or disruption) tolerant sensor networks may be modeled as Markovian evolving graphs. The authors present experimental evidence showing that considering multiple (possibly not shortest)...
Provided by Carleton University
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White Papers
On Minimizing the Maximum Sensor Movement for Barrier Coverage of a Line Segment
June 26, 2009, 12:00am PDT
The authors consider n mobile sensors located on a line containing a barrier represented by a finite line segment. Sensors form a wireless sensor network and are able to move within the line. An...
Provided by Carleton University
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White Papers
A Hop Count Based Greedy Face Greedy Routing Protocol on Localized Geometric Spanners
October 14, 2009, 12:00am PDT
The authors describe a Fast Delivery Guaranteed Face Routing (FDGF) in ad hoc wireless networks. Since it is expensive for wireless nodes to get the whole network topology information, geometric...
Provided by Carleton University
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White Papers
Prioritized Access for Emergency Stations in Next Generation Broadband Wireless Networks
December 31, 2009, 12:00am PST
The authors focus on the interference between mobile stations as they attempt to gain access to an OFDMA-based WiMAX/IEEE 802.16 network. They propose a set of strategies that enable base stations...
Provided by Carleton University
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White Papers
Mitigation of Flooding Disruption Attacks in Hierarchical OLSR Networks
February 22, 2011, 12:00am PST
The Hierarchical Optimized Link State Routing (HOLSR) protocol was designed to improve scalability of heterogeneous Mobile Ad-Hoc NETworks (MANETs). HOLSR is derived from the OLSR protocol and...
Provided by Carleton University
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White Papers
WIMAX/802.16 Broadband Wireless Networks
March 2, 2010, 12:00am PST
WiMAX/802.16 is a kind of network providing IP-based broadband wireless access to infrastructure networks such as the Internet. The two main envisioned applications are Web access and voice over...
Provided by Carleton University
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White Papers
Maintaining Connectivity in Sensor Networks Using Directional Antennae
May 10, 2010, 12:00am PDT
Connectivity in wireless sensor networks may be established using either omnidirectional or directional antennae. The former radiate power uniformly in all directions while the latter emit greater...
Provided by Carleton University
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White Papers
Online Routing in Quasi-Planar and Quasi-Polyhedral Graphs
January 1, 2011, 12:00am PST
The authors address the problem of online route discovery for a class of graphs that can be embedded either in two or in three dimensional space. In two dimensions they propose the class of...
Provided by Carleton University
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White Papers
Tracking Mobile Users in Cellular Networks Using Timing Information
February 1, 2009, 12:00am PST
The authors consider the problem of tracking a mobile user moving through a cellular network using node queries that provide information as to last time the user visited the node. Queries are...
Provided by Carleton University
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White Papers
Communication in Random Geometric Radio Networks With Positively Correlated Random Faults
May 29, 2008, 12:00am PDT
The authors study the feasibility and time of communication in random geometric radio networks, where nodes fail randomly with positive correlation. They consider a set of radio stations with the...
Provided by Carleton University
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White Papers
A Geometric Routing Protocol in Disruption Tolerant Network
December 16, 2008, 12:00am PST
The authors describe a novel Geometric Localized Routing (GLR) protocol in Disruption (Delay) Tolerant Network (DTN). Although DTNs do not guarantee the connectivity of the network all the time,...
Provided by Carleton University
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White Papers
Map Construction and Exploration by Mobile Agents Scattered in a Dangerous Network
October 6, 2008, 12:00am PDT
The authors consider the map construction problem in a simple, connected graph by a set of mobile computation entities or agents that start from scattered locations throughout the graph. The...
Provided by Carleton University
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White Papers
EasiSim: A Scalable Simulation Platform for Wireless Sensor Networks
December 27, 2007, 12:00am PST
Traditional simulators cannot meet the requirement of modeling large scale networks due to their deficiency in scalability. In this paper, the authors present a new simulator, namely EasiSim, for...
Provided by Carleton University
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White Papers
Secure Localization of Nodes in Wireless Sensor Networks With Limited Number of Truth Tellers
February 22, 2009, 12:00am PST
The authors provide in this paper three algorithms that enable the sensor nodes of a Wireless Sensor Network (WSN) to determine their location in presence of neighbor sensors that may lie about...
Provided by Carleton University
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White Papers
Relative Span Weighted Localization of Uncooperative Nodes in Wireless Networks
May 20, 2009, 12:00am PDT
Increasingly ubiquitous wireless technologies require novel localization techniques to pinpoint the position of an uncooperative node, whether the target is a malicious device engaging in a...
Provided by Carleton University
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White Papers
Probabilistic Evidence Aggregation for Malicious Node Position Bounding in Wireless Networks
October 30, 2008, 12:00am PDT
Hyperbolic position bounding of malicious devices aims to estimate the location of a wireless network rogue insider that transmits an attack message containing falsified information to mislead...
Provided by Carleton University
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White Papers
Turbo Equalization Based Iterative Channel Estimation in SDMA SC-FDE Systems
February 15, 2009, 12:00am PST
Channel Estimation (CE) with co-channel interference in an uplink Space Division Multiple Access (SDMA) Single Carrier (SC) with Frequency Domain Equalization (SC-FDE) system has been evaluated....
Provided by Carleton University
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White Papers
Distributed Key Establishment in Disruption Tolerant Location Based Social Wireless Sensor and Actor Network
February 21, 2011, 12:00am PST
The authors describe a novel Distributed Key Establishment (DKE) protocol in Disruption (Delay) Tolerant Location Based Social Wireless Sensor and Actor Networks (DTLBSWSAN). In DKE, they propose...
Provided by Carleton University
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White Papers
Centroid Localization of Uncooperative Nodes in Wireless Networks Using a Relative Span Weighting Method
September 21, 2009, 12:00am PDT
Increasingly ubiquitous wireless technologies require novel localization techniques to pinpoint the position of an uncooperative node, whether the target is a malicious device engaging in a...
Provided by Carleton University
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White Papers
Investigating the Validity of the Gaussian Approximation for the Distribution of the Aggregate Interference Power in Large Wireless Networks
February 26, 2010, 12:00am PST
The distribution of the aggregate interference power in large wireless networks has gained increasing attention with the emergence of different types of wireless networks such as ad-hoc networks,...
Provided by Carleton University
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White Papers
Fairness Analysis in Cellular Networks Using Stochastic Petri Nets
July 21, 2011, 12:00am PDT
Cellular wireless networks based on OFDMA utilize adaptive modulation and coding to operate effectively in regions of high and low SINR. Therefore the local single antenna spectral efficiency...
Provided by Carleton University
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White Papers
Adaptive Multiple Time-Scale Power Allocation for Spectrum Sharing in DS-CDMA Networks
February 28, 2008, 12:00am PST
In this paper, the authors propose Adaptive Multiple Time-Scale Power Allocation (AMTPA) method for Opportunistic Spectrum Access (OSA) in the uplink of DS-CDMA networks. In AMTPA, the secondary...
Provided by Carleton University
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White Papers
A Fair Radio Resource Allocation Scheme for Ubiquitous High-Data-Rate Coverage in OFDMA-Based Cellular Relay Networks
August 10, 2009, 12:00am PDT
The provision of very high data rates in a ubiquitous and fair manner throughout the service area is a great challenge for 4G and beyond-4G wireless networks. Towards that end, the deployment of...
Provided by Carleton University
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White Papers
Threshold Based Relay Selection in Cooperative Wireless Networks
August 15, 2008, 12:00am PDT
This paper considers two-hop cooperative relaying using multiple relays and proposes a threshold based relay selection protocol. In this protocol the relays are selected among those having...
Provided by Carleton University
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White Papers
Practical Turbo Receiver Design for Throughput-Efficient Relay ARQ Transmissions Over Broadband Cooperative MIMO Channels
August 1, 2011, 12:00am PDT
In this paper, the authors investigate practical turbo receiver design for throughput-efficient relay ARQ transmissions over broadband cooperative MIMO channels. The setup is comprised of three...
Provided by Carleton University
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White Papers
Mixed Time-Scale Generalized Fair Scheduling for Amplify-and-Forward Relay Networks
August 1, 2010, 12:00am PDT
The authors devise an optimization framework for Generalized Proportional Fairness (GPF) under different time scales for Amplify-and-Forward (AF) relay networks. In GPF scheduling, a single input...
Provided by Carleton University
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White Papers
Fairness-Aware Joint Routing and Scheduling in OFDMA-Based Cellular Fixed Relay Networks
February 23, 2009, 12:00am PST
Relaying and Orthogonal Frequency Division Multiple Access (OFDMA) are the accepted technologies for emerging wireless communications standards. The activities in many wireless standardization...
Provided by Carleton University
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White Papers
Identifying Boundaries of Dominant Regions Dictating Spectrum Sharing Opportunities for Large Secondary Networks
June 16, 2010, 12:00am PDT
An important parameter in determining a spectrum sharing opportunity is the level of interference power that secondary users may generate towards primary users. It is indicated in literature that...
Provided by Carleton University
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White Papers
Outage in a Cellular Network Overlaid With an Ad Hoc Network: The Uplink Case
July 15, 2011, 12:00am PDT
The authors analyze the uplink outage probability at the randomly, but not necessarily independently nor homogeneously, distributed cellular network receivers caused by an overlaid secondary ad...
Provided by Carleton University
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