The quest for LEDBAT fairness

  • Carofiglio G.
  • Muscariello L.
  • Rossi D.
  • Valenti S.

BitTorrent developers have recently introduced a new application layer congestion control algorithm based on UDP framing at transport layer and currently under definition at the IETF LEDBAT Working Group. LEDBAT is a delay-based protocol which aims at offering a "lower than Best Effort" data transfer service, with a lower priority ...

NICE: A Network Interference Cancellation Engine for Opportunistic Uplink Cooperation in Wireless Networks

  • Balachandran K.
  • Kang J.
  • Karakayali K.
  • Rege K.

: Recently, there has been considerable interest in the potential of inter-base station cooperation techniques to manage excessive out-of-cell interference in evolving cellular networks. It has been observed that on the uplink, significant improvements in interference rejection can be attained by exchanging complex-valued received signal samples across a cluster of ...

Genetic Algorithm Based Multiuser Scheduling for Single- and Multi-cell Systems with Successive Interference Cancellation

  • Liu J.
  • Shi Z.
  • Sun F.
  • Wen P.
  • You M.

It is well-known that wireless scheduling algorithm could exploit multi-user diversity to enhance the network capacity. With multiple transmit/receive antennas, there are additional degrees of freedom which could deliver either spatial multiplexing gain and/or spatial diversity gain. With cross layer scheduling, there is also multi-user selection diversity which contributes to ...

Community Based Application (When open innovation meets business)

  • Aghasaryan A.
  • Andrieu X.
  • Boidart B.
  • Germaneau A.
  • Marilly E.
  • Senot C.

: TV screens are everywhere in public places (bars, airports, shopping malls) and at home. At the same time, end users are increasingly bound to their mobile terminals, not only for phone usage, but also for applications and services. The mobile terminal becomes a personal agent of the user, containing ...

80×100-Gbit/s transmission over a record 9,000km distance using erbium-doped fiber repeaters only

  • Bigo S.
  • Charlet G.
  • Koebele C.
  • Mardoyan H.
  • Salsi M.
  • Tran P.

: A record transoceanic transmission distance at 100Gbit/s is demonstrated with EDFA repeaters only. The result was obtained with coherent detection, ultra low-loss large effective area fiber, and PDM-QPSK modulation format. ©2010 Optical Society of America OCIS codes: (060.1660) coherent communication; (060.4510) optical communication

Experimental Investigation into Honeycomb Heat Sinks Incorporating Varying Size Slots for Enhanced Heat Transfer

  • Hernon D.

In this experimental investigation novel honeycomb heat sink designs that incorporate slots of varying length are presented. Thermal and hydrodynamic performance comparisons are made for a longitudinally-finned heat sink, a wavy wall heat sink of the same geometric dimensions, a closed channel honeycomb heat sink and a number of honeycomb ...

Context-aware Search of Ontology-based Tagged Data

  • Arabshian K.

The World Wide Web revolutionized the use of the Internet and brought us into the information age. It began with websites that were maintained and read by people. Automated search engines were built to index these websites. Specifically, the speed and accuracy of search results provided by Google revolutionized the ...

Studying the sum capacity of mobile multiuser diversity systems with feedback errors and delay

  • Valentin S.
  • Wild T.

To achieve multiuser diversity gains, resource allocation relies on accurate and timely feedback of the users' channel states. This feedback suffers from transmission errors and delay which can heavily degrade the sum capacity of a scheduled multiuser downlink. The order of this capacity loss and its interdependency to relevant scenario ...

A Novel Downlink Resource Scheduling Scheme for Relay Enhanced Cellular Network

  • Jiang Q.
  • Liu J.
  • Pang J.
  • Shen G.
  • Wang D.

In the relay-enhanced cellular network, the target user will receive uncertain interference due to orthogonal transmission between BS and RS, which would make the traditional mechanisms of link adaptation and channel-aware scheduling invalid. In this paper, a novel resource scheduling scheme is proposed with a semi-static mode, in which dominant ...

Distributed Service Composition and Execution Framework in GloServ

  • Arabshian K.
  • Mehta A.

This report presents a framework for distributed ontology based dynamic composition and execution of services. This work extends the already existing GloServ which was an ontology based service discovery in a globally distributed network. We also present a look into various bottlenecks in using an OWL-S based semantic web service ...

Inter-Cell Interference Coordination based on Soft Frequency Reuse for Relay Enhanced Cellular Network

  • A P.
  • A S.
  • Dongyao W.
  • K W.
  • Liu J.

In view of the new feature after introducing the relay nodes (RNs) into the conventional cellular networks, a novel soft frequency reuse (SFR)-based inter-Cell interference coordination (ICIC) scheme is proposed in the relay enhanced cellular networks. On the basis of original ICIC scheme for conventional cellular network, RNs in the ...

Throughput of a wireless cell using superposition based multiple-access with optimized scheduling

  • Schaepperle J.

This paper studies the performance of a novel approach for multi-user access in the uplink of a wireless cell. The approach uses non-orthogonal superposition and multi-user detection on top of an orthogonal multiple-access method like OFDMA. An optimized scheduling method is proposed and used for the capacity based throughput study. ...

Developing Applications for EBIF and Tru2Way

  • Arlein R.
  • Gaglianello R.
  • Liu D.
  • Spergel L.

The ongoing convergence of Computers, Telephony and Television, along with an increasing interest by Cable MSO's in interactive applications, has created opportunities for developers to create interactive rich applications on a new set of platforms. The MSO's are basing their foray into interactive applications on industry standard platforms and environments. ...

InGaAs Communication Photodiodes: From low to high power level designs

  • Achouche M.
  • Caillaud C.
  • Carpentier M.
  • Glastre G.
  • Lahrichi M.

While InGaAs absorption material has been used for various applications up to 1.6microns wavelength, specific designs for low level detection have become of main interest using high responsivity and low dark current detectors. By adding an avalanche multiplication layer to form an avalanche photodiode (APD) using the Separated Absorption and ...

An Efficient Cholesky Decomposition based Multiuser MIMO Detection Algorithm

  • Chen Y.
  • Halbauer H.
  • Jeschke M.
  • Richter R.

This paper presents an efficient multiuser Multiple Input Multiple Output (MU-MIMO) detection algorithm. It introduces Cholesky Decomposition (CLD) and deploys Successive Interference Cancellation (SIC) detection. Study reveals, that proposed algorithm delivers equivalent performance to QR Decomposition (QRD) based detection algorithm, with adequately lower complexity. As well, the CLD based detection ...

Chirp Reduction in Directly Modulated Multi-electrode RSOA Devices in Passive Optical Networks

  • Brenot R.
  • Chanclou P.
  • De Valicourt G.
  • Duan G.
  • Lamponi M.
  • Poingt F.
  • Pommereau F.
  • Violas M.

We demonstrate that the use of an optimized bielectrode reflective semiconductor optical amplifier as remote modulator reduces the chirp therefore the penalties for transmission from 6 to 4.5 dB on standard fibre at 2.5 Gbit/s over 50 km. Simulation of carrier density are presented in order to explain the chirp ...

Rate Adaptation for Energy Efficiency in Packet Networks

  • Francini A.
  • Stiliadis D.

An ideal model for energy consumption in a packet network is one where energy use is proportional to traffic forwarding rates [2]. More specifically, energy use in a network should scale with the overall traffic load and should become negligible in network elements that do not process packets. It is ...

InP DHBT Transimpedance Amplifiers with Automatic Offset Compensation for 100 Gbit/s Optical Communications

  • Dupuy J.
  • Godin J.
  • Jorge F.
  • Konczykowska A.
  • Riet M.

We present the design, fabrication and measurement of two transimpedance amplifiers with single-ended input and differential output for optical fibre communication systems. The integrated circuits have been fabricated in a 0.7-µm InP DHBT technology. The small-signal differential transimpedance gain and 3-dB bandwidth are respectively 1100 and 50 GHz for the ...

Distinct Counting with a Self-Learning Bitmap

  • Cao J.
  • Chen A.
  • Nguyen T.
  • Shepp L.

Estimating the number of distinct elements (cardinality) is a fundamental problem in database that has attracted recurrent interest, due to its extensive applications in modern computer networks. There have been several probabilistic approaches, proposed in the computer science literature to address this problem in online applications that only require limited ...

Packet-Optical Add/Drop Multiplexer Technology: a pragmatic way to introduce optical packet switching in the next generation of metro networks

  • Antona J.
  • Chiaroni D.
  • Simonneau C.

The Fibre-to-the-Home Technology (FTTH) by offering new opportunities at the subscriber side in terms of high bit rate applications, creates new capacity needs in metropolitan and backbone networks. Equipments manufacturers are then looking at new technical approaches to propose networks able to handle higher capacities than today, in a flexible ...