The Experts below are selected from a list of 12504 Experts worldwide ranked by ideXlab platform

Marina Settembre - One of the best experts on this subject based on the ideXlab platform.

  • Proposal of an all Optical Shuffle Multihop Network
    European Transactions on Telecommunications, 1993
    Co-Authors: F. Matera, Emilio Ripani Cnr, Marco Romagnoli, Marina Settembre
    Abstract:

    In this paper a shuffle Multihop Network, with a routing and a processing completely obtained at optical level, is proposed for the first time. Such a Network can be performed by means of optical AND gates based on second harmonic generation and optical XOR gates based on soliton dragging process. Soliton pulses ape used to avoid the distortion caused by chromatic dispersion. The main characteristics of the Network are a number of nodes equal to 64 and a bit rate among the users equal to 50 Gbit/s for a total throughput of about 1 Tbit/s.

  • Proposal of all optical soliton shuffle Multihop Network
    Electronics Letters, 1992
    Co-Authors: F. Matera, E. Ripani, Marina Settembre
    Abstract:

    A shuffle Multihop Network is presented with routing and processing obtained entirely optically using all-optical AND and XOR gates. Soliton pulses are used to avoid the distortion caused by chromatic dispersion. This Network can support a traffic relative to 64 users communicating at 48 Gbit/s achieving a total throughput of ∼ 1 Tbit/s.

Nader Moayeri - One of the best experts on this subject based on the ideXlab platform.

  • real time deployment of Multihop relays for range extension
    International Conference on Mobile Systems Applications and Services, 2007
    Co-Authors: Michael R Souryal, Johannes Geissbuehler, Leonard E Miller, Nader Moayeri
    Abstract:

    When the range of single-hop wireless communication is limited by distance or harsh radio propagation conditions, relays can be used to extend the communication range through Multihop relaying. This paper targets the need in certain scenarios for rapid deployment of these relays when little or nothing is known in advance about a given environment and its propagation characteristics. Applications include first responders entering a large building during an emergency, search and rescue robots maneuvering a disaster sight, and coal miners working underground. The common element motivatingthis work is the need to maintain communications in an environment where single-hop communication is typically inadequate. This paper investigates the feasibility of the automated deployment of a Multihop Network. A deployment procedure is proposed that employs real-time link measurements and takes into account the physical layer characteristics of a mobile multipath fading environment and the radio in use. A prototype system is implemented based on 900 MHz TinyOS motes supporting low-speed data applications including text messaging, sensor data and RFID-assisted localization. Results of deployments in a hi-rise office building are presented.

Yi-min Wang - One of the best experts on this subject based on the ideXlab platform.

  • Distributed topology control for power efficient operation in Multihop wireless ad hoc Networks
    Proceedings - IEEE INFOCOM, 2001
    Co-Authors: Roger Wattenhofer, Paramvir Bahl, Li Li, Yi-min Wang
    Abstract:

    The topology of wireless Multihop ad hoc Networks can be controlled by varying the transmission power of each node. We propose a simple distributed algorithm where each node makes local decisions about its transmission power and these local decisions collectively guarantee global connectivity. Specifically, based on the directional information, a node grows it transmission power until it finds a neighbor node in every direction. The resulting Network topology increases the Network lifetime by reducing the transmission power and reduces traffic interference by having low node degrees. Moreover, we show that the routes in the Multihop Network are efficient in power consumption. We give an approximation scheme in which the power consumption of each route can be made arbitrarily close to the optimal by carefully choosing the parameters. Simulation results demonstrate significant performance improvements

F. Matera - One of the best experts on this subject based on the ideXlab platform.

  • Proposal of an all Optical Shuffle Multihop Network
    European Transactions on Telecommunications, 1993
    Co-Authors: F. Matera, Emilio Ripani Cnr, Marco Romagnoli, Marina Settembre
    Abstract:

    In this paper a shuffle Multihop Network, with a routing and a processing completely obtained at optical level, is proposed for the first time. Such a Network can be performed by means of optical AND gates based on second harmonic generation and optical XOR gates based on soliton dragging process. Soliton pulses ape used to avoid the distortion caused by chromatic dispersion. The main characteristics of the Network are a number of nodes equal to 64 and a bit rate among the users equal to 50 Gbit/s for a total throughput of about 1 Tbit/s.

  • Proposal of all optical soliton shuffle Multihop Network
    Electronics Letters, 1992
    Co-Authors: F. Matera, E. Ripani, Marina Settembre
    Abstract:

    A shuffle Multihop Network is presented with routing and processing obtained entirely optically using all-optical AND and XOR gates. Soliton pulses are used to avoid the distortion caused by chromatic dispersion. This Network can support a traffic relative to 64 users communicating at 48 Gbit/s achieving a total throughput of ∼ 1 Tbit/s.

Lixia Zhang - One of the best experts on this subject based on the ideXlab platform.

  • security in mobile ad hoc Networks challenges and solutions
    IEEE Wireless Communications, 2004
    Co-Authors: Hao Yang, Haiyun Luo, Fan Ye, Songwu Lu, Lixia Zhang
    Abstract:

    Security has become a primary concern in order to provide protected communication between mobile nodes in a hostile environment. Unlike the wireline Networks, the unique characteristics of mobile ad hoc Networks pose a number of nontrivial challenges to security design, such as open peer-to-peer Network architecture, shared wireless medium, stringent resource constraints, and highly dynamic Network topology. These challenges clearly make a case for building multifence security solutions that achieve both broad protection and desirable Network performance. In this article we focus on the fundamental security problem of protecting the Multihop Network connectivity between mobile nodes in a MANET. We identify the security issues related to this problem, discuss the challenges to security design, and review the state-of-the-art security proposals that protect the MANET link- and Network-layer operations of delivering packets over the Multihop wireless channel. The complete security solution should span both layers, and encompass all three security components of prevention, detection, and reaction.