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An efficient method for analysis of the ultra-wide band (UWB) antenna is proposed, the UWB microstrip antennas are analyzed by the mixed potential integral equation (MPIE). The produced dense impedance matrix is partitioned and compressed hierarchically by the multilevel UV method. And the linear systems are solved by the generalized minimal residual method (GMRES) iterative solver, the required matrix-vector...
Instead of using an expensive 3D Laser scanner, a 3D volumetric representation of environments for the Simultaneous Localization and Mapping (SLAM) with a 2D Laser Range Finder, augmented with an additional self-integrated servomechanism was devised. Since the computing time of Iterative Closest Points (ICP) algorithm mainly depends on the numbers of cloud points, we proposed an effective edge feature...
This paper is a study on the numerical solution of linear systems arising from the discretization of the improved electric field integral equation (IEFIE) for electromagnetic scattering problems. Using incomplete LU factorization preconditioner, the IEFIE is solved by generalized minimal residual iterative method in the context of the multilevel fast multipole algorithm (MLFMA). Numerical results...
In order to efficiently solve large dense complex linear systems arising from electric field integral equations (EFIE) formulation of electromagnetic scattering problems, the multilevel fast multipole algorithm (MLFMA) is used to accelerate the matrix-vector product operations. This paper presents a modified spectral shift preconditioner, which is combined with other preconditioner can greatly improve...
In this paper, a new method called fast directional multilevel algorithm is preconditioned by an efficient Calderon multiplicative preconditioner (CMP) for three-dimensional (3-D) electromagnetic problems. The new algorithm does not require the implementation of multipole expansions of the Green's function but based only on kernel evaluations. Combined with the Caldron identities of the CMP, the new...
An adaptive integral method based on far-field expansion is introduced to analyze planar microstrip structure. The auxiliary basis functions are constructed as superposition of point-like current elements located on rectangular grids which reproduce the same far field as generated from the original basis functions. Then it is able to employ the fast Fourier transform technique to speed up the matrix...
Iterative multiuser receivers constitute an effective solution for transmission over multiple access interference (MAI) infested channels, when invoking a combined multiuser detector and channel decoder. Most reduced-complexity methods in this area use the complex-valued minimum mean squared error (CMMSE) multiuser detector (MUD). Since the desired output of BPSK systems is real-valued, minimizing...
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