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In this paper the composite scattering from a sea surface and a plasma-coated target is investigated by the finite-difference time-domain (FDTD) method. Both the sea water and the plasma layer are regarded as the isotropic and dispersive medium, and they satisfy the Debye model and the Drude model, respectively. The auxiliary differential equation (ADE) technique is incorporated into the FDTD scheme...
In this paper, the authors apply the tree-cotree splitting (TCS) algorithm to the TDFEM to alleviate the constraint on the time-step size and to improve the convergence of iterative solutions at each time step. Compared with the conventional TDFEM, application of the TCS algorithm maintains the accuracy of the TDFEM solution but significantly reduces the number of iterations per time step for a preconditioned...
This paper presents a hybrid field-circuit solver based on the hybridization of the time-domain finite element method and a SPICE-like lumped circuit simulation. Advanced features of the proposed hybrid solver include incorporation of multiport lumped networks, application of the tree-cotree splitting technique, and introduction of a flexible time-marching scheme.
This paper describes a time-domain approach for base station transmission sleep modes, taking the Long Term Evolution (LTE) system as a specific example. The idea of this design is to enable the base station to reduce RF energy consumption in low traffic conditions, while still properly supporting active user connections. By switching off traffic during a certain time period and delivering all user...
This paper presents an accurate and efficient algorithm to incorporate multiport lumped networks into a hybrid field-circuit solver based on the time-domain finite-element method (TDFEM). By casting its admittance matrix into the time-stepping equations, a lumped-network subsystem is formulated and then interfaced with the FEM subsystem through the FEM edges and the circuit subsystem through circuit...
Numerical simulation has become an indispensable tool for the design and optimization of complex antenna systems. In an advanced antenna system multiple antenna elements are usually arranged into a certain array configuration, driven through a feed network whose major function is to distribute the input signal from the signal generator to the radiating elements and combine the signals received by...
Several methods of character analysis and classification for pulse condition are studied with the use of statistics theory. There methods are applied to character abstraction. Pulse condition is analyzed in time, frequency and wavelet domain. Two classifications methods are used, namely back-propagation neural network (BPNN) and fuzzy neural network (FNN). Withdrew pulse condition characteristic to...
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