Concept

Physical layer

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Optimal Delay-Rate-Reliabiliy Tradeoff in Networks with composite Links

Suhas Diggavi

Networks need to accommodate diverse applications with different Quality-of-Service (QoS) requirements. New ideas at the physical layer are being developed for this purpose, such as diversity embedded coding, which is a technique that combines high rates w ...

2007

Emergent semantics

Philippe Cudré-Mauroux

In the past, the problem of semantic interoperability in information systems was mostly solved by means of centralization, both at a system and at a logical level. This approach has been successful to a certain extent, but offers limited scalability and fl ...

EPFL2007

Optimal PHY and MAC Protocols for Wide-Band Ad-Hoc Networks

Jean-Yves Le Boudec

We consider a wide-band ad-hoc network with coherent radios in a slow-fading environment, and we analyze the performance of different physical layer (PHY) and medium access (MAC) schemes in such a network. Most of the existing analysis assume that PHY is b ...

2007

Error and Attack Tolerance of Layered Complex Networks

Patrick Thiran, Patric Hagmann, Maciej Kurant

Many complex systems may be described by not one but a number of complex networks mapped on each other in a multi-layer structure. Because of the interactions and dependencies between these layers, the state of a single layer does not necessarily reflect w ...

2007

Topian 0.1 Reference Manual

Jean-Cédric Chappelier, Emmanuel Eckard

This document describes Topian ("Topic-based Model layer for Xapian"), a software layer intended to add support for topical models to Xapian. ...

2007

Schemes and architectures for wireless ad hoc networks and cooperative communication

Tarik Tabet

The focus of this thesis is on the study of decentralized wireless multi-hop networks. We are particularly interested in establishing bounds on the traffic-carrying capabilities of wireless ad hoc networks and conditions on the scalability of such networks ...

EPFL2007

Joint Playback Delay and Buffer Optimization in Scalable Video Streaming

Pascal Frossard, Jean-Paul Wagner

This paper addresses the problem of the transmission of scalable video streams to a set of heterogeneous clients through a common bottleneck channel. The packet scheduling policy is typically crucial in such systems that target smooth media playback at all ...

2007

A Simulation Model for Wireless Sensor Networks Based on TOSSIM

Giovanni De Micheli, David Atienza Alonso, Francisco Javier Rincon Vallejos, Alexandru Emilian Susu

Wireless Sensor Networks (WSNs) are composed of a large number of very small devices used for biomedical or environmental monitoring applications. These devices measure various natural processes at different locations, and cooperate in order to aggregate t ...

IMSE2007

Least-Cost Opportunistic Routing

Martin Vetterli, Matthias Grossglauser, Henri Julien Dubois-Ferrière

In opportunistic routing, each node maintains a group of candidate next-hops to reach a particular destination, and transmits packets to any node in this group. The choice of candidate next-hops at each node is a key question that is central to the perform ...

2007

Secure incentives to cooperate for wireless networks

The operating principle of certain wireless networks makes essential the cooperation between the mobile nodes. However, if each node is an autonomous selfish entity, cooperation is not guaranteed and therefore we need to use incentive techniques. In this t ...

EPFL2007