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In this paper, estimation of channels with large delay spread but with few nonzero taps, such as those encountered in hilly broadcast wireless communications, are considered. Exploiting the sparsity, a channel estimate can be obtained by using a matching pursuit (MP) algorithm. To improve the performance of MP algorithm based estimation, the orthogonal matching pursuit (OMP) algorithm for channel...
Based on the spatial characteristic of airplane flexible control system, an effective location arithmetic is proposed to simplify three-dimensional location problems into two-dimensional solution. In this arithmetic, some coordinate transformation formulas are expressed, and arithmetic implementations are described easy to program by computer. Through the arithmetic, the computational complexity is...
Finite element models of hole-structure are built for analyzing hole-edge contact problems under thermal loads. In order to obtain accurate and reasonable numerical results, elastic model and elastic-plastic model are built in gradual improvement. In order to eliminate the influence of clamped support, a kind of artificial elastic boundary is proposed for simulating the boundary of hole-structure...
In the world, China is one of greatest nation that products and expends lots of electrical appliances. Since the year of 2003, China's household appliances have entered the peak of obsolescence, which discards approximately more than 30 million every year. As China basically hasn't constructed regular reverse logistics system of discarded and used household appliances at present, the majority of them...
Reverse logistics is the means driving economic growth, and third-party reverse logistics (3PRL) is the important carrier to realize reverse logistics. So, the analysis on 3PRL and its provider selection is important. All of these third-party companies would benefit from a framework for decision making to determine if entry into this market is feasible for them. This paper firstly present the conception...
As an efficient artificial truncating boundary condition, conformal perfectly matched layer (CPML) is a kind of multilayer anisotropic absorbing media. To reduce computing effort of CPML, this article proposes a layer-oriented element integration algorithm. In this algorithm, the relative dielectric constant and permeability are considered as constants for each the very thin monolayer of CPML, and...
Coefficient matrix of linear equations from finite element method (FEM) is sparse and symmetrical. For the sake of CPU operational time saving to accesses data in matrix decomposition and reducing storing requirement to computer, we introduce fully sparse strategy that stores only nonzero elements of symmetrical part by chain pattern management. Based on the incomplete Cholesky decomposition with...
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