The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform

Leonid G. Kazovsky - One of the best experts on this subject based on the ideXlab platform.

  • hornet a packet over wdm multiple Access metropolitan area ring network
    IEEE Journal on Selected Areas in Communications, 2000
    Co-Authors: K Shrikhande, Ian M White, D Wonglumsom, S M Gemelos, M S Rogge, Y Fukashiro, M Avenarius, Leonid G. Kazovsky
    Abstract:

    Current metropolitan area networks (MANs) based on the SONET transport are not developing at the rate required to support the phenomenal increase in data traffic. To address the needs of future MANs, the Optical Communications Research Laboratory at Stanford University and Sprint Advanced Technology Laboratories are building HORNET (Hybrid Optoelectronic Ring NETwork). HORNET has a multiple Access architecture, in which nodes Access any WDM channel using a novel Media Access Control protocol and fast tunable laser transmitters. HORNET transports data packets directly over the WDM ring, eliminating the SONET transport. This paper presents the HORNET architecture, the node design consisting of novel packet-over-WDM components, and the experimental testbed with results.

  • hornet a packet over wdm multiple Access metropolitan area ring network
    IEEE Journal on Selected Areas in Communications, 2000
    Co-Authors: K Shrikhande, Ian M White, D Wonglumsom, S M Gemelos, M S Rogge, Y Fukashiro, M Avenarius, Leonid G. Kazovsky
    Abstract:

    Current metropolitan area networks (MANs) based on the SONET transport are not developing at the rate required to support the phenomenal increase in data traffic. To address the needs of future MANs, the Optical Communications Research Laboratory at Stanford University and Sprint Advanced Technology Laboratories are building HORNET (Hybrid Optoelectronic Ring NETwork). HORNET has a multiple Access architecture, in which nodes Access any WDM channel using a novel Media Access Control protocol and fast tunable laser transmitters. HORNET transports data packets directly over the WDM ring, eliminating the SONET transport. This paper presents the HORNET architecture, the node design consisting of novel packet-over-WDM components, and the experimental testbed with results.

Abdallah Shami - One of the best experts on this subject based on the ideXlab platform.

  • a novel mimo aware distributed Media Access Control scheme for ieee 802 11 wireless local area networks
    Local Computer Networks, 2007
    Co-Authors: Daniel J. Dechene, Khalim Amjad Meerja, Abdallah Shami, Serguei Primak
    Abstract:

    This paper proposes a new distributed Media Access Control (MAC) scheme to improve the network performance of Multiple-Input Multiple-Output (MIMO) wireless systems. In particular, this novel MAC scheme efficiently schedules two simultaneous transmissions between wireless stations (each equipped with three antennas) that are located in a single collision domain. Along with weighted nulling and intelligent packet fragmentation, this MAC scheme is capable of providing more efficient utilization of channel resources. The proposed MIMO-aware MAC scheme is compatible with the IEEE 802.11 standard. Detailed simulations are carried out to study the performance of the proposed scheme. The performance of the MIMO-aware MAC scheme is also compared with a recently proposed MIMO MAC scheme in the literature which is compatible with the IEEE 802.11 standard. Comparisons reveal that the proposed MIMO-aware MAC scheme achieves better throughput and delay performance under both saturated and unsaturated conditions.

  • analysis of new distributed Media Access Control schemes for ieee 802 11 wireless local area networks
    IEEE Transactions on Vehicular Technology, 2007
    Co-Authors: Khalim Amjad Meerja, Abdallah Shami
    Abstract:

    Many modifications are proposed in the literature to improve the throughput performance of the distributed coordination function (DCF) under congested environments. These improvements are achieved by modifying the contention-window reset mechanism used in the DCF protocol. However, the main drawback with these modifications is the high backoff process overhead. We have recently proposed a new modification to DCF (N-DCF) to improve the throughput performance by reducing the average backoff overhead. In this paper, we propose a throughput model for N-DCF, which is applicable for arbitrary load conditions. We verify the throughput model by NS-2 simulations. Then, we compare the performance of N-DCF with other recently proposed DCF enhancements in the literature. Comparisons reveal that only N-DCF provides throughput improvement in the request-to-send/clear-to-send Access mechanism. Finally, we propose two more schemes to further improve the performance of our original N-DCF scheme.

K Shrikhande - One of the best experts on this subject based on the ideXlab platform.

  • csma ca mac protocols for ip hornet an ip over wdm metropolitan area ring network
    Global Communications Conference, 2000
    Co-Authors: K Shrikhande, Ian M White, D Wonglumsom, S M Gemelos, M S Rogge, A Srivatsa, L G Kazovksy
    Abstract:

    As data traffic increases exponentially, IP over WDM transport will replace conventional SONET transport in metropolitan area networks. Such networks will require new Media Access Control (MAC) protocols to efficiently share network bandwidth among multiple network nodes. This paper describes and evaluates novel and practical carrier sense multiple Access with collision avoidance (CSMA/CA) MAC protocols for IP over WDM ring networks that handle variable size IP packets without complex variable optical delays or centralized algorithms. Simulation results show that the proposed IP-MAC protocols are efficient and comparable to our selected benchmark and will be implemented in the IP-HORNET testbed.

  • hornet a packet over wdm multiple Access metropolitan area ring network
    IEEE Journal on Selected Areas in Communications, 2000
    Co-Authors: K Shrikhande, Ian M White, D Wonglumsom, S M Gemelos, M S Rogge, Y Fukashiro, M Avenarius, Leonid G. Kazovsky
    Abstract:

    Current metropolitan area networks (MANs) based on the SONET transport are not developing at the rate required to support the phenomenal increase in data traffic. To address the needs of future MANs, the Optical Communications Research Laboratory at Stanford University and Sprint Advanced Technology Laboratories are building HORNET (Hybrid Optoelectronic Ring NETwork). HORNET has a multiple Access architecture, in which nodes Access any WDM channel using a novel Media Access Control protocol and fast tunable laser transmitters. HORNET transports data packets directly over the WDM ring, eliminating the SONET transport. This paper presents the HORNET architecture, the node design consisting of novel packet-over-WDM components, and the experimental testbed with results.

  • hornet a packet over wdm multiple Access metropolitan area ring network
    IEEE Journal on Selected Areas in Communications, 2000
    Co-Authors: K Shrikhande, Ian M White, D Wonglumsom, S M Gemelos, M S Rogge, Y Fukashiro, M Avenarius, Leonid G. Kazovsky
    Abstract:

    Current metropolitan area networks (MANs) based on the SONET transport are not developing at the rate required to support the phenomenal increase in data traffic. To address the needs of future MANs, the Optical Communications Research Laboratory at Stanford University and Sprint Advanced Technology Laboratories are building HORNET (Hybrid Optoelectronic Ring NETwork). HORNET has a multiple Access architecture, in which nodes Access any WDM channel using a novel Media Access Control protocol and fast tunable laser transmitters. HORNET transports data packets directly over the WDM ring, eliminating the SONET transport. This paper presents the HORNET architecture, the node design consisting of novel packet-over-WDM components, and the experimental testbed with results.

M S Rogge - One of the best experts on this subject based on the ideXlab platform.

  • a new Media Access Control protocol guaranteeing fairness among users in ethernet based passive optical networks
    Optical Fiber Communication Conference, 2003
    Co-Authors: H Bae, M S Rogge, Yuli Hsueh, L G Kazovsky, Kyeong Soo Kim
    Abstract:

    We propose a new EPON MAC protocol guaranteeing fairness among users by allocating excess bandwidth proportional to their subscription rates. The novelty of the protocol is in the use of scalable per-subscription-rate-queuing with round-robin scheduling and packet reclassification at ONU.

  • csma ca mac protocols for ip hornet an ip over wdm metropolitan area ring network
    Global Communications Conference, 2000
    Co-Authors: K Shrikhande, Ian M White, D Wonglumsom, S M Gemelos, M S Rogge, A Srivatsa, L G Kazovksy
    Abstract:

    As data traffic increases exponentially, IP over WDM transport will replace conventional SONET transport in metropolitan area networks. Such networks will require new Media Access Control (MAC) protocols to efficiently share network bandwidth among multiple network nodes. This paper describes and evaluates novel and practical carrier sense multiple Access with collision avoidance (CSMA/CA) MAC protocols for IP over WDM ring networks that handle variable size IP packets without complex variable optical delays or centralized algorithms. Simulation results show that the proposed IP-MAC protocols are efficient and comparable to our selected benchmark and will be implemented in the IP-HORNET testbed.

  • hornet a packet over wdm multiple Access metropolitan area ring network
    IEEE Journal on Selected Areas in Communications, 2000
    Co-Authors: K Shrikhande, Ian M White, D Wonglumsom, S M Gemelos, M S Rogge, Y Fukashiro, M Avenarius, Leonid G. Kazovsky
    Abstract:

    Current metropolitan area networks (MANs) based on the SONET transport are not developing at the rate required to support the phenomenal increase in data traffic. To address the needs of future MANs, the Optical Communications Research Laboratory at Stanford University and Sprint Advanced Technology Laboratories are building HORNET (Hybrid Optoelectronic Ring NETwork). HORNET has a multiple Access architecture, in which nodes Access any WDM channel using a novel Media Access Control protocol and fast tunable laser transmitters. HORNET transports data packets directly over the WDM ring, eliminating the SONET transport. This paper presents the HORNET architecture, the node design consisting of novel packet-over-WDM components, and the experimental testbed with results.

  • hornet a packet over wdm multiple Access metropolitan area ring network
    IEEE Journal on Selected Areas in Communications, 2000
    Co-Authors: K Shrikhande, Ian M White, D Wonglumsom, S M Gemelos, M S Rogge, Y Fukashiro, M Avenarius, Leonid G. Kazovsky
    Abstract:

    Current metropolitan area networks (MANs) based on the SONET transport are not developing at the rate required to support the phenomenal increase in data traffic. To address the needs of future MANs, the Optical Communications Research Laboratory at Stanford University and Sprint Advanced Technology Laboratories are building HORNET (Hybrid Optoelectronic Ring NETwork). HORNET has a multiple Access architecture, in which nodes Access any WDM channel using a novel Media Access Control protocol and fast tunable laser transmitters. HORNET transports data packets directly over the WDM ring, eliminating the SONET transport. This paper presents the HORNET architecture, the node design consisting of novel packet-over-WDM components, and the experimental testbed with results.

Khalim Amjad Meerja - One of the best experts on this subject based on the ideXlab platform.

  • a novel mimo aware distributed Media Access Control scheme for ieee 802 11 wireless local area networks
    Local Computer Networks, 2007
    Co-Authors: Daniel J. Dechene, Khalim Amjad Meerja, Abdallah Shami, Serguei Primak
    Abstract:

    This paper proposes a new distributed Media Access Control (MAC) scheme to improve the network performance of Multiple-Input Multiple-Output (MIMO) wireless systems. In particular, this novel MAC scheme efficiently schedules two simultaneous transmissions between wireless stations (each equipped with three antennas) that are located in a single collision domain. Along with weighted nulling and intelligent packet fragmentation, this MAC scheme is capable of providing more efficient utilization of channel resources. The proposed MIMO-aware MAC scheme is compatible with the IEEE 802.11 standard. Detailed simulations are carried out to study the performance of the proposed scheme. The performance of the MIMO-aware MAC scheme is also compared with a recently proposed MIMO MAC scheme in the literature which is compatible with the IEEE 802.11 standard. Comparisons reveal that the proposed MIMO-aware MAC scheme achieves better throughput and delay performance under both saturated and unsaturated conditions.

  • analysis of new distributed Media Access Control schemes for ieee 802 11 wireless local area networks
    IEEE Transactions on Vehicular Technology, 2007
    Co-Authors: Khalim Amjad Meerja, Abdallah Shami
    Abstract:

    Many modifications are proposed in the literature to improve the throughput performance of the distributed coordination function (DCF) under congested environments. These improvements are achieved by modifying the contention-window reset mechanism used in the DCF protocol. However, the main drawback with these modifications is the high backoff process overhead. We have recently proposed a new modification to DCF (N-DCF) to improve the throughput performance by reducing the average backoff overhead. In this paper, we propose a throughput model for N-DCF, which is applicable for arbitrary load conditions. We verify the throughput model by NS-2 simulations. Then, we compare the performance of N-DCF with other recently proposed DCF enhancements in the literature. Comparisons reveal that only N-DCF provides throughput improvement in the request-to-send/clear-to-send Access mechanism. Finally, we propose two more schemes to further improve the performance of our original N-DCF scheme.