University of Padova

Displaying 1-40 of 67 results

  • White Papers // Apr 2013

    Cache Privacy in Named-Data Networking

    Content-Centric Networking (CCN) is an alternative to host-centric networking exemplified by today's Internet. CCN emphasizes content distribution by making content directly addressable. Named-Data Networking (NDN) is an example of CCN being considered as candidate next-generation Internet architecture. One key NDN feature is router-side content caching that optimizes bandwidth consumption, reduces...

    Provided By University of Padova

  • White Papers // Mar 2013

    Poseidon: Mitigating Interest Flooding DDoS Attacks in Named Data Networking

    Content-Centric Networking (CCN) is an emerging networking paradigm being considered as a possible replacement for the current IP-based host-centric Internet infrastructure. In CCN, named content becomes a first-class entity. CCN focuses on content distribution, which dominates current Internet traffic and is arguably not well served by IP. Named-Data Networking (NDN)...

    Provided By University of Padova

  • White Papers // Mar 2013

    Secure Verification of Location Claims on a Vehicular Safety Application

    Traffic safety through inter-vehicular communication is one of the most promising and challenging applications of Vehicular Ad-hoc NETworks (VANET). In this paper, information such as position, direction, and speed, is often broadcast by vehicles so as to facilitate fast multi-hop propagation of possible alert messages. Unfortunately, a malicious vehicle can...

    Provided By University of Padova

  • White Papers // Jul 2012

    Performance Analysis of an Opportunistic Relay Selection Protocol for Multi-Hop Networks

    In this paper, the authors analyze the performance of an interference-aware opportunistic relay selection protocol for multi-hop line networks which is based on the following simple rule: a node always transmits if it has a packet, except when its successive node on the line is transmitting. They derive analytically the...

    Provided By University of Padova

  • White Papers // Jun 2012

    To Compress or Not to Compress: Processing Vs Transmission Tradeoffs for Energy Constrained Sensor Networking

    In the past few years, lossy compression has been widely applied in the field of Wireless Sensor Networks (WSN), where energy efficiency is a crucial concern due to the constrained nature of the transmission devices. Often, the common thinking among researchers and implementers is that compression is always a good...

    Provided By University of Padova

  • White Papers // Apr 2012

    An Algorithmic Solution for Computing Circle Intersection Areas and Its Applications to Wireless Communications

    A novel iterative algorithm for the efficient computation of the intersection areas of an arbitrary number of circles is presented. The algorithm, based on a trellis-structure, hinges on two geometric results which allow the existence-check and the computation of the area of the intersection regions generated by more than three...

    Provided By University of Padova

  • White Papers // Jan 2012

    Time-Varying Clock Offset Estimation in Two-Way Timing Message Exchange in Wireless Sensor Networks Using Factor Graphs

    The problem of clock offset estimation in a two-way timing exchange regime is considered when the likelihood function of the observation time stamps is exponentially distributed. In order to capture the imperfections in node oscillators, which render a time-varying nature to the clock offset, a novel Bayesian approach to the...

    Provided By University of Padova

  • White Papers // Jan 2012

    Power and Rate Control Outage Based in CDMA Wireless Networks

    The authors characterize the maximum throughput achievable for the up-link of a power-controlled WCDMA wireless system with variable spreading factor. Their system model includes multi access interference caused by users with heterogeneous data sources, and quality of service expressed in terms of outage probability. Inner loop and outer loop power...

    Provided By University of Padova

  • White Papers // Jan 2012

    Analysis of Spatial Multiplexing for Cross-Layer Design of MIMO Ad Hoc Networks

    The authors consider the application of spatial multiplexing to ad hoc networks where nodes have multiple antennas. At the physical level, they suppose that layered space-time multiuser detection (LAST - MUD) is applied to separate multiple streams arriving at the receiver simultaneously. Their contributions here consist first in the reproduction...

    Provided By University of Padova

  • White Papers // Oct 2011

    Self-Organizing Home Networking Based on Cognitive Radio Technologies

    The increasing complexity of the future wireless networks leads to the requirement for self-organization. This is true especially in home networking where users are typically not networking professionals and cannot be expected to perform complex optimization and management tasks. In this paper, cognitive radio concept combining cross-layer optimization and learning...

    Provided By University of Padova

  • White Papers // Apr 2011

    A Power-Efficient Wireless Sensor Network for Continuously Monitoring Seismic Vibrations

    The authors present a novel power-efficient wireless sensor network for continuously monitoring and analyzing seismic vibrations with sensor nodes and forwarding the retrieved information with low-cost relay nodes to backend applications. The applied vibration sensing algorithms are derived from the DIN 4150-3 standard. All nodes in the network are battery-powered...

    Provided By University of Padova

  • White Papers // Apr 2011

    On ARQ Strategies Over Random Access Protocols in Underwater Acoustic Networks

    In this paper, the authors introduce a mechanism to improve the performance of ARQ over underwater links. Their scheme aims at reproducing a Selective Repeat ARQ strategy: to do this, it sets up a form of time-division duplex link between the transmitter and its receiver, by leveraging on the propagation...

    Provided By University of Padova

  • White Papers // Apr 2011

    On the Performance of Delay-Tolerant Routing Protocols in Underwater Networks

    The underwater acoustic channel features long and variable propagation delay, high bit error rate and limited bandwidth. Moreover, underwater mobile networks consisting of Autonomous Underwater Vehicles (AUVs) for surveillance and monitoring applications often suffer from intermittent connectivity as nodes move around the area of operations. Therefore, this scenario is appropriately...

    Provided By University of Padova

  • White Papers // Apr 2011

    What Lies Beneath The Internationalization Of Firms In A Regional Innovation System?

    The aim of the paper is to identify the most efficient internationalization strategies of SMEs firms belonging to various industrial districts localized in a particularly dynamic Regional Innovation System (RIS) like that one of the Emilia Romagna, one of the most affluent and industrialized regions of Italy. By doing so,...

    Provided By University of Padova

  • White Papers // Feb 2011

    Design and Analysis of Random Access Networks With Interference Alignment

    The concept of interference alignment has been studied mainly from an information-theoretic and signal processing point of view, focusing on scenarios with a high degree of coordination among nodes often achieved by means of transmission scheduling. However, many real-world networks employ random access policies rather than deterministic scheduling, and it...

    Provided By University of Padova

  • White Papers // Jan 2011

    JENNA: A Jamming Evasive Network-Coding Neighbor-Discovery Algorithm for Cognitive Radio Networks

    Cognitive radios operate in a particularly challenging wireless environment. In such an environment, besides the strict requirements imposed by the opportunistic co-existence with licensed users, cognitive radios may have to deal with other concurrent (either malicious or selfish) cognitive radios which aim at gaining access to most of the available...

    Provided By University of Padova

  • White Papers // Jan 2011

    A Distributed Network Coded Control Channel for Multi-Hop Cognitive Radio Networks

    Designing a solution for multi-hop cognitive radio networks poses several challenges such as the realization of the control channel, the detection of primary users and the coordination of secondary users for dynamic spectrum access purposes. In this paper, the authors discuss these challenges, and they propose a solution which aims...

    Provided By University of Padova

  • White Papers // Jan 2011

    Fuzzy Logic for Cross-Layer Optimization in Cognitive Radio Networks

    The search for the ultimate architecture for cross-layer optimization in cognitive radio networks is characterized by challenges such as modularity, interpretability, imprecision, scalability, and complexity constraints. In this paper, the authors propose fuzzy logic as an effective means of meeting these challenges, as far as both knowledge representation and control...

    Provided By University of Padova

  • White Papers // Jan 2011

    Learning and Adaptation in Cognitive Radios Using Neural Networks

    The estimation of the communication performance achievable with respect to environmental factors and configuration parameters play a key role in the optimization process performed by a cognitive radio according to the original definition by Mitola. In this paper, the authors propose the use of multilayered feedforward neural networks as an...

    Provided By University of Padova

  • White Papers // Jan 2011

    On the Implications of Layered Space - Time Multiuser Detection on the Design of MAC Protocols for Ad Hoc Networks

    In recent years, ad hoc networks, i.e. networks formed by diverse wireless-enabled devices, wishing to communicate without the need for an underlying infrastructure or a pre-defined contract between the users, are gaining momentum. Ad hoc networks guarantee networking operations a flexibility that wired networks cannot reach, for a number of...

    Provided By University of Padova

  • White Papers // Jan 2011

    Strategies and Tradeoffs for Coded Cooperation in Wireless Networks

    In a wireless network, fading significantly affects the performance, and diversity techniques are used to overcome this issue. Cooperation among nodes provides spatial diversity by means of packet relaying. In coded cooperation, diversity is further enhanced since cooperating nodes transmit different parts of a coded packet on different channels. In...

    Provided By University of Padova

  • White Papers // Jan 2011

    Some Issues Concerning MAC Design in Ad Hoc Networks With MIMO Communications

    In this paper, the authors highlight some advantages that can be exploited while designing Medium Access Control (MAC) protocols for wireless ad hoc networks with multiple antennas. Their purpose is to trace a connection between network studies and physical layer studies, building a framework for protocol design that stems from...

    Provided By University of Padova

  • White Papers // Jan 2011

    A New Cooperative Strategy for Deafness Prevention in Directional Ad Hoc Networks

    The authors propose the novel concept of cooperation for deafness prevention in directional antenna ad hoc networks, along with a low-complexity multiuser detector specialised for these systems. They call a generic MAC protocol that uses these techniques a Cooperative-MAC (CMAC) and they define an upper and a lower bound on...

    Provided By University of Padova

  • White Papers // Dec 2010

    Spectrum Leasing Via Cooperative Opportunistic Routing

    A spectrum leasing mechanism is proposed for the coexistence between a primary and a secondary network that is based on cooperation and opportunistic routing. The primary network consists of a source and a destination communicating via a number of primary relay nodes. In each transmission slot, the next hop is...

    Provided By University of Padova

  • White Papers // Nov 2010

    An Experimental Study on IEEE 802.15.4 Multichannel Transmission to Improve RSSI?based Service Performance

    In Wireless Sensor Networks (WSNs) the majority of the devices provide access to the Received Signal Strength Indicator (RSSI), which has been used as a means to enable different services and applications like localization, geographic routing and link quality estimation. Notwithstanding the popularity of using RSSI for localization, academic research...

    Provided By University of Padova

  • White Papers // Nov 2010

    Crime, Immigration And The Labor Market: A General Equilibrium Model

    Does immigration cause crime? To answer this question, the authors build a two-country general equilibrium model with search costs in which the migration (in/out-) flows, the crime rates and the equilibrium wages in the two countries are determined by the interaction between the labor market, the crime market and the...

    Provided By University of Padova

  • White Papers // Oct 2010

    CRABSS: CalRAdio-Based Advanced Spectrum Scanner for Cognitive Networks

    The first step required by the process of cognition is the intelligent observation of the environment that surrounds the actors of such a process. The authors present the CalRAdio-Based advanced Spectrum Scanner (CRABSS), an open platform developed to monitor the ISM 2.4-2.499 GHz band and reveal opportunities for a better...

    Provided By University of Padova

  • White Papers // Sep 2010

    Access Regulation, Entry And The Investment Ladder In Telecommunications

    This paper presents a model of competition between an incumbent and an entrant firm in telecommunications. The entrant has the option to enter the market with or without having preliminary invested in its own infrastructure; in case of facility based entry, the entrant has also the option to invest in...

    Provided By University of Padova

  • White Papers // Aug 2010

    Performance Evaluation of Random and Handshake-Based Channel Access in Collaborative Mobile Underwater Networks

    In this paper, the authors compare communication schemes in scenarios of interest for underwater networks where multiple nodes collaborate towards the accomplishment of a target detection and tracking task. They consider two specific cases: a mobile Autonomous Underwater Vehicle (AUV) collects data from a set of fixed sensors deployed on...

    Provided By University of Padova

  • White Papers // Aug 2010

    A Dynamic Framed ALOHA Scheme for Batch Resolution in Practical CSMA-Based Wireless Networks

    The batch resolution problem consists in arbitrating the channel access of a group of nodes in a wireless network in order to collect a single packet from each node in the shortest time. Most of existing solutions are based on the immediate feedback assumption and typically neglect or underestimate the...

    Provided By University of Padova

  • White Papers // Jul 2010

    Throughput and Energy Efficiency of Opportunistic Routing With Type-I HARQ in Linear Multihop Networks

    Opportunistic routing is a well-known technique that exploits the broadcast nature of wireless transmissions and path diversity to form the route in an adaptive manner based on current channel conditions. This paper studies the throughput advantages of opportunistic routing over conventional multihop routing for linear multihop wireless networks with type-I...

    Provided By University of Padova

  • White Papers // Jul 2010

    PLG: A Framework for the Generation of Business Process Models and Their Execution Logs

    Evaluating process mining algorithms would require the avail-ability of a suite of real-world business processes and their execution logs, which hardly are available. In this paper, the authors propose an approach for the random generation of business processes and their execution logs. This paper is based on the generation of...

    Provided By University of Padova

  • White Papers // Jul 2010

    On Interference-Aware Cooperation Policies for Wireless Ad Hoc Networks

    In this paper, the authors devise efficient optimization techniques to find optimal routing and scheduling policies for wireless ad hoc networks in the presence of multi-user interference and cooperative transmissions. Their focus is to assess the impact of interfering among distinct data flows on optimal routing paths and related transmission...

    Provided By University of Padova

  • White Papers // Jul 2010

    Cooperation Toward Environmental Innovation: An Empirical Investigation

    This paper explores the relationship between firms' cooperation and their propensity toward environmental innovation. Previous literature has emphasized the peculiarities of such innovations based on their drivers, their positive spill-overs and the importance of regulation to trigger them. This paper contributes to the literature by focusing on the importance of...

    Provided By University of Padova

  • White Papers // May 2010

    Governance And Value Creation In Grant-Giving Foundations

    Grant giving foundation leaders are increasingly concerned with understanding the primary role their institutions are pressured to play in financing the growing non-profit sectors of developed economies. Furthermore, many academics, political leaders and practitioners are expecting foundations to play the unique role of merchant banks and venture capitalists to foster...

    Provided By University of Padova

  • White Papers // Mar 2010

    A Scalable Dynamic Spectrum Access Solution for Large Wireless Networks

    In this paper, the authors present a distributed dynamic spectrum access framework which can scale up to networks of large size. According to it, the network is divided into clusters, and spectrum access is performed by leveraging on a virtual network coded cognitive control channel that works in conjunction with...

    Provided By University of Padova

  • White Papers // Feb 2010

    A Cluster Formation Protocol for Cognitive Radio Ad Hoc Networks

    In this paper, the authors present a solution for the realization of large cognitive radio networks. The solution features a spectrum-aware neighbor discovery and clustering scheme that works in conjunction with a network coded cognitive control channel in order to allow cognitive radio devices to opportunistically access the unused spectrum....

    Provided By University of Padova

  • White Papers // Feb 2010

    Hybrid Cooperative-Network Coding Medium Access Control for High-Rate Wireless Personal Area Networks

    Past research has shown that Carrier Sense Multiple Access (CSMA) is not a particularly favorable environment for cooperative networks. This observation suggests that other medium access schemes, like scheduled TDMA, may enable cooperation to yield more substantial improvements over conventional techniques. From this point of view, a hybrid cooperative-network coding...

    Provided By University of Padova

  • White Papers // Feb 2010

    Learning At The Boundaries In An "Open Regional Innovation System": A Focus On Firms Innovation Strategies In The Emilia Romagna Life Science Industry

    The paper investigates the existence of an Open Regional Innovation System (ORIS model). This model is characterised by the firms' adoption of an open innovation strategy, which overcomes not only the boundaries of the firms but also the boundaries of the region. Using data collected in a sample of life...

    Provided By University of Padova

  • White Papers // Dec 2009

    Stock Market Conditions And Monetary Policy In A DSGE Model For The U.S

    This paper investigates the interactions between stock market fluctuations and monetary policy within a DSGE model for the U.S. economy. First, the authors design a framework in which fluctuations in households financial wealth are allowed - but not necessarily required - to exert an impact on current consumption. This is...

    Provided By University of Padova