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Daniela Dragomirescu

  1. Radio Interface for High Data Rate Wireless Sensor Networks.

    Fri, 04/02/2010 - 15:02 — SomNambul
    Authors: Aubin Lecointre, Daniela Dragomirescu, Robert Plana, Julien Henaut
    Subjects: Networking and Internet Architecture
    Abstract

    This paper gives an overview of radio interfaces devoted for high data rate
    Wireless Sensor Networks. Four aerospace applications of WSN are presented to
    underline the importance of achieving high data rate. Then, two modulation
    schemes by which High Data Rate can be achieved are compared : Multi carrier
    approaches, represented by the popular Orthogonal Frequency Division
    Multiplexing (OFDM) and Single carrier methods, represented by Single Carrier
    Frequency division Equalization and its application for multiple access Single
    Carrier Frequency division multiple Access (SC-FDMA).

  2. IR-UWB Channel Capacity for Analog and Mostly Digital Implementation.

    Thu, 02/04/2010 - 16:01 — SomNambul
    Authors: Aubin Lecointre, Daniela Dragomirescu, Robert Plana
    Subjects: Networking and Internet Architecture
    Abstract

    The impact of the type of implementation is considered on the IR-UWB channel
    capacity. This study is lead for analog and mostly digital implementation. Key
    parameters and theirs impacts on the channel capacity are exposed in each case:
    data converters for mostly digital implementations and pulse generators
    capabilities for analog implementations. These two implementations are compared
    from a data rate point of view. Their behaviors regarding an increase of the
    operating frequency are also studied

  3. SOPC Co-Design Platform for UWB Systems in Wireless Sensor Network Context.

    Wed, 02/03/2010 - 16:01 — SomNambul
    Authors: Aubin Lecointre, Daniela Dragomirescu, Robert Plana
    Subjects: Networking and Internet Architecture
    Abstract

    This paper presents our approach of the radio interface problematic for
    Wireless Sensor Network. We introduce the WSN context and constraints
    associated. We propose an IR-UWB solution and illustrate why it could be a
    viable solution for WSN. A high level modelling and simulation platform for
    IR-UWB radio interface is proposed on Matlab. It allows us to determine
    according to BER versus Eb/N0 criteria and the WSN constraints what kind of
    design is more adequate. Moreover, a co-design co-simulation platform Matlab
    VHDL is proposed here.

  4. Simulation Platform for Wireless Sensor Networks Based on Impulse Radio Ultra Wide Band.

    Wed, 02/03/2010 - 16:01 — SomNambul
    Authors: Aubin Lecointre, Daniela Dragomirescu, Robert Plana, Abdoulaye Berthe
    Subjects: Networking and Internet Architecture
    Abstract

    Impulse Radio Ultra Wide Band (IR-UWB) is a promising technology to address
    Wireless Sensor Network (WSN) constraints. However, existing network simulation
    tools do not provide a complete WSN simulation architecture, with the IR-UWB
    specificities at the PHYsical (PHY) and the Medium Access Control (MAC) layers.
    In this paper, we propose a WSN simulation architecture based on the IR-UWB
    technique. At the PHY layer, we take into account the pulse collision by
    dealing with the pulse propagation delay. We also modelled MAC protocols
    specific to IRUWB, for WSN applications.

  5. Medium Access Control for Wireless Sensor Networks based on Impulse Radio Ultra Wideband.

    Wed, 02/03/2010 - 16:01 — SomNambul
    Authors: Aubin Lecointre, Daniela Dragomirescu, Robert Plana, Abdoulaye Berthe
    Subjects: Networking and Internet Architecture
    Abstract

    This paper describes a detailed performance evaluation of distributed Medium
    Access Control (MAC) protocols for Wireless Sensor Networks based on Impulse
    Radio Ultra Wideband (IR-UWB) Physical layer (PHY). Two main classes of Medium
    Access Control protocol have been considered: Slotted and UnSlotted with
    reliability. The reliability is based on Automatic Repeat ReQuest (ARQ). The
    performance evaluation is performed using a complete Wireless Sensor Networks
    (WSN) simulator built on the Global Mobile Information System Simulator
    (GloMoSim).

  6. Channel Capacity Limitations versus Hardware Implementation for UWB Impulse Radio Communications.

    Wed, 02/03/2010 - 16:01 — SomNambul
    Authors: Aubin Lecointre, Daniela Dragomirescu, Robert Plana
    Subjects: Networking and Internet Architecture
    Abstract

    Starting from the Shannon channel capacity, we propose an IR-UWB channel
    capacity based on the delay spread for multipath time variant channels. This
    IR-UWB channel capacity is obtained from the no ISI (Inter Symbol Interference)
    assumption and for binary modulations. The impact of the kind of implementation
    is considered on the IR-UWB channel capacity. This study is lead for mixed and
    mostly digital implementation.

  7. Performance Evaluation of Impluse Radio Ultra Wide Band Wireless Sensor Networks.

    Wed, 02/03/2010 - 16:01 — SomNambul
    Authors: Aubin Lecointre, Daniela Dragomirescu, Robert Plana, Abdoulaye Berthe
    Subjects: Networking and Internet Architecture
    Abstract

    This paper presents a performance evaluation of Wireless Sensor Networks
    (WSN) based on Impulse Radio Ultra Wideband (IR-UWB) over a new simulation
    platform developed for this purpose. The simulation platform is built on an
    existing network simulator: Global Mobile Information System Simulator
    (GloMoSim). It mainly focuses on the accurately modeling of IR-UWB PHYsical
    (PHY) and Medium Access Control (MAC) layer. Pulse collision is modeled
    according to the used time hopping sequence (THS) and the pulse propagation
    delay in order to increase the simulation fidelity.

  8. New methodology to design advanced MR-IRUWB communication system.

    Wed, 02/03/2010 - 16:01 — SomNambul
    Authors: Aubin Lecointre, Daniela Dragomirescu, Robert Plana
    Subjects: Networking and Internet Architecture
    Abstract

    A new model is proposed giving the channel capability of a MB-IR-UWB system
    versus the number of subband and the duty cycle. The architecture simulated
    shows data rate ranging from 1.434 Gbits/s to 0.9 Gbits/s for 16 to 10 subbands
    and duty cycle ranging from 20% to 12%.

  9. Study of Reconfigurable Mostly Digital Radio for Manet.

    Wed, 02/03/2010 - 16:01 — SomNambul
    Authors: Aubin Lecointre, Daniela Dragomirescu, Robert Plana
    Subjects: Networking and Internet Architecture
    Abstract

    We introduce the radio reconfigurability thanks to IRUWB mostly digital
    architecture for MANET context. This particular context implies some
    constraints on the radio interface such as low cost, low power, small
    dimensions and simplicity. Here, we propose an implementation of dynamic
    reconfigurable receiver on ASIC, and FPGA, after having explained the
    advantages of mostly digital radio for reconfigurability. In this paper, by
    studying our prototypes, we could prove that reconfigurability is on the
    contrary with MANET constraints needs.

  10. Software defined radio layer for IR-UWB systems in Wireless Sensor Network Context.

    Wed, 02/03/2010 - 16:01 — SomNambul
    Authors: Aubin Lecointre, Daniela Dragomirescu, Robert Plana
    Subjects: Networking and Internet Architecture
    Abstract

    This paper addresses the radio interface problematic for MANET (Mobile Ad-hoc
    NETwork) applications. Here we propose to study the radio reconfigurability in
    order to provide a unique physical layer which is able to deal with all MANET
    applications. For implementing this reconfigurable physical layer, we propose
    to use Impulse Radio Ultra WideBand (IRUWB). This paper presents also our two
    level design approach for obtaining our reconfigurable IR-UWB receiver on FPGA
    (Field Programmable Gate Array).

  11. Miniaturized wireless sensor network.

    Wed, 02/03/2010 - 16:01 — SomNambul
    Authors: Aubin Lecointre, Daniela Dragomirescu, David Dubuc, Grenier Katia, Pons Patrick, Hervé Aubert, A. Muller, Pascal Berthou, Thierry Gayraud, Robert Plana
    Subjects: Networking and Internet Architecture
    Abstract

    This paper addresses an overview of the wireless sensor networks. It is shown
    that MEMS/NEMS technologies and SIP concept are well suited for advanced
    architectures. It is also shown analog architectures have to be compatible with
    digital signal techniques to develop smart network of microsystem.

Math-arch

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