In this paper, a reduced-rank scheme with joint iterative optimization is presented for direction of arrival estimation. A rank-reduction matrix and an auxiliary reduced-rank parameter vector are jointly optimized to calculate the output power with respect to each scanning angle. Subspace algorithms to estimate the rank-reduction matrix and the auxiliary vector are proposed. Simulations are per...

We consider the direction finding problem in time-varying arrays composed of identically oriented subarrays displaced by unknown vector translations. A new eigenstructure-based estimator is proposed for such a class of partly calibrated sensor arrays.

In this paper, an innovative beamforming-type approach for suppressing cochannel interference in mobile radio networks is introduced. This approach combines a super-resolution direction and power profile finding algorithm, together with a signal subspace-type broad null beamformer which can steer both sharp and controlled broad nulls in the appropriate directions. The latter property makes the ...

Passive receiving systems are used to intercept emissions of interest, both communication and Radar, and to measure their characteristic parameters in order to classify and possibly identify them. Direction of Arrival (DOA) is one of the most important parameters to be measured, as it can yield a localization fix by means of triangulation (if more receivers are dislocated on the area), or howev...

We investigate unary operations ∨, ∧ and ♦ on a set X satisfying x = x∨∨ = x∧∧ and x♦ = x∨∧ = x∧∨ for all x ∈ X. Moreover, if in particular X is a meet-semilattice, then we also investigate the operations defined by x = x ∧ x∨, x = x ∧ x∧, x = x ∧ x♦; x• = x∨ ∧ x∧, x♣ = x∨ ∧ x♦, x♠ = x∧ ∧ x♦; and x = x ∧ x∨ ∧ x∧ ∧ x♦ for all x ∈ X. Our prime example for this is the set-lattice P(U × V ) of all ...