253 research outputs found
MATEX: A Distributed Framework for Transient Simulation of Power Distribution Networks
We proposed MATEX, a distributed framework for transient simulation of power
distribution networks (PDNs). MATEX utilizes matrix exponential kernel with
Krylov subspace approximations to solve differential equations of linear
circuit. First, the whole simulation task is divided into subtasks based on
decompositions of current sources, in order to reduce the computational
overheads. Then these subtasks are distributed to different computing nodes and
processed in parallel. Within each node, after the matrix factorization at the
beginning of simulation, the adaptive time stepping solver is performed without
extra matrix re-factorizations. MATEX overcomes the stiff-ness hinder of
previous matrix exponential-based circuit simulator by rational Krylov subspace
method, which leads to larger step sizes with smaller dimensions of Krylov
subspace bases and highly accelerates the whole computation. MATEX outperforms
both traditional fixed and adaptive time stepping methods, e.g., achieving
around 13X over the trapezoidal framework with fixed time step for the IBM
power grid benchmarks.Comment: ACM/IEEE DAC 2014. arXiv admin note: substantial text overlap with
arXiv:1505.0669
SDN - Architectural Enabler for Reliable Communication over Millimeter-Wave 5G Networks
Millimeter-wave (mmWave) frequency bands offer a new frontier for
next-generation wireless networks, popularly known as 5G, to enable
multi-gigabit communication; however, the availability and reliability of
mmWave signals are significantly limited due to its unfavorable propagation
characteristics. Thus, mmWave networks rely on directional narrow-beam
transmissions to overcome severe path-loss. To mitigate the impact of
transmission-reception directionality and provide uninterrupted network
services, ensuring the availability of mmWave transmission links is important.
In this paper, we proposed a new flexible network architecture to provide
efficient resource coordination among serving basestations during user
mobility. The key idea of this holistic architecture is to exploit the
software-defined networking (SDN) technology with mmWave communication to
provide a flexible and resilient network architecture. Besides, this paper
presents an efficient and seamless uncoordinated network operation to support
reliable communication in highly-dynamic environments characterized by high
density and mobility of wireless devices. To warrant high-reliability and guard
against the potential radio link failure, we introduce a new transmission
framework to ensure that there is at least one basestation is connected to the
UE at all times. We validate the proposed transmission scheme through
simulations.Comment: This article has been accepted for publication at the IEEE GLOBECOM
2018 Workshops, Abu Dhabi, UAE, 9-13 December 201
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