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Secular dynamics of charged particles in the vortex electromagnetic wave beam is widely used in many ranges. However, the conventional numerical schemes for this problem are failed when the charged particle velocities reach up to relativistic region. The coherent accumulation of numerical errors may destroy the simulation and introduce pseudo physics. To obtain an applicable numerical tool for secular...
Energy efficiency and green communication have been a hot research topic in ICT industry recently. For cellular networks, the energy cost of base stations (BSs) makes a huge proportion of the total cost. This paper concentrates on finding an approach to shut down BSs with low traffic load from active mode to sleeping mode. QoE, instead of QoS, is guaranteed in this paper. Since different service types...
Mobility model and call admission control (CAC) algorithm are important for wireless mobility networks. This paper firstly sets a practical mobility model, and then presents a novel measurement-based CAC algorithm utilizing time series analysis under the random model. The algorithm updates the reservation threshold by directly forecasting the next possible number of handoff dropping calls, using ARMA...
Orthogonal frequency division multiplexing (OFDM) technique is capable of suppressing inter-symbol interference (ISI) caused by multi-path propagation, confronting multi-path fading and improving the efficiency of spectrum resource. Dynamic resource reallocation algorithm is a kind of important technology in OFDM system and plays a key role in improving the spectrum of OFDM effectively. Based on the...
Smooth Particle Hydrodynamics (SPH) is an accurate method in fluid numerical simulation. In this paper we introduce a calculating algorithm based on the SPH, and propose an interactive method to simulate fluids with free surfaces. This method is completely consistent with the dynamic behavior of a viscous fluid, namely described by Navier-Stokes equations. In addition, for online simulation, we adopt...
Based on the study of IEEE-1355 communication bus protocol in rugged environment, this paper puts forward a scheme of wormhole routing in network layer. Also a prototype of this wormhole router based on FPGA in rugged environment is designed and implemented. Experiment result shows that this solution can meet the demand of IEEE-1355 communication bus.
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