Bru García, Rafael; Gasso Matoses, María Teresa; Santana-De Asis, Máximo De Jesús(Elsevier, 2022-01-01)
[EN] In this work, we study a lower bound of the condition number of a matrix by its combined matrix. In particular, we construct a special combined matrix in such a way that the sums of its columns are lower bounds of the ...
Roger Varea, Sandra(Universitat Politècnica de València, 2011-10-19)
[EN] In the last ten years, one of the most significant technological developments that will lead to the
new broadband wireless generation is the communication via Multiple-Input Multiple-Output
(MIMO) systems. MIMO ...
Navarro-Jiménez, José-Manuel; Nadal, Enrique; Tur Valiente, Manuel; Martínez Casas, José; Ródenas, Juan José(John Wiley & Sons, 2020-07-15)
[EN] Fictitious domain methods, like the Cartesian grid finite element method (cgFEM), are based on the use of unfitted meshes that must be intersected. This may yield to ill-conditioned systems of equations since the ...