Method and receiver device for reconstructing signals distorted by multi-directional diffusion
First Claim
1. A method for reconstructing signals distorted by multipath propagation, wavefronts assignable to signal components being received by a centrosymmetric sensor group having sensor elements, having two measures to be carried out separately, comprising the steps of:
- in a first measure, determining incidence direction of wavefronts associated with respective dominant signal components ignoring lower-power signal components and interference components by utilizing phase differences occurring between the sensor elements with respect to a wavefront, and reconstructing the dominant signal components; and
in a second measure that is carried out separately from the first measure and utilizing the dominant signal components reconstructed according to the first measure, assigning the determined dominant signal components to associated spatially separate signal sources and reconstructing the signals by combination of signal components associated with a signal source.
2 Assignments
0 Petitions
Accused Products
Abstract
Signals distorted by multipath propagation are reconstructed. In a first step, the incidence direction of the wavefronts, that is to say of the respective d dominant signal components, is estimated and the signal components are reconstructed. The wavefronts are separated as a result of the first step. A second step reconstructs the signals distorted by multipath propagation with the aid of the wavefronts, separated by spatial direction, and therefore with the aid of the reconstructed signal components, through combination of the signal components, by assigning the determined d dominant signal components to the l associated signal sources and, expediently, determining delay times and weighting factors with a view to optimal combination of the signal components in order to reconstruct the signals. The method may be applied either to one-dimensional or two-dimensional evaluation of the incidence direction of the wavefronts, and is suitable, in particular, for mobile-radio or wireless communication systems, high-resolution radar image processing systems and sonar systems.
-
Citations
24 Claims
-
1. A method for reconstructing signals distorted by multipath propagation, wavefronts assignable to signal components being received by a centrosymmetric sensor group having sensor elements, having two measures to be carried out separately, comprising the steps of:
-
in a first measure, determining incidence direction of wavefronts associated with respective dominant signal components ignoring lower-power signal components and interference components by utilizing phase differences occurring between the sensor elements with respect to a wavefront, and reconstructing the dominant signal components; and in a second measure that is carried out separately from the first measure and utilizing the dominant signal components reconstructed according to the first measure, assigning the determined dominant signal components to associated spatially separate signal sources and reconstructing the signals by combination of signal components associated with a signal source. - View Dependent Claims (2, 3, 4, 5, 8, 9, 10, 11, 12, 13, 14, 15)
-
-
6. The method as claimed in claim 6, wherein the sensor group, which is two-dimensional, extensive, centrosymmetric and invariant in two directions, consists of M elements and the method has evaluation dimensions x and y, wherein the method further comprises:
-
determining the selection matrices (K.sub.μ
1, K.sub.μ
2, Kv1, Kv2) in accordance with the two dimensions of the sensor group, producing a system of equations, determined by the signal subspace matrix (Es), from a signal subgroup formation, containing the dominant signal vectors, and solving the selection matrices (K1, K2) for the dimensions x and y according to the relationships K.sub.μ
, v1 Es Y.sub.μ
,v ≈
K.sub.μ
,v2 Es, so that in each case a solution matrix (Y) according to K1 E2 Y≈
K2 Es is implemented and the solution matrices (Y.sub.μ
, Yv) are available,pairing eigenvalues of the solution matrices (Y.sub.μ
, Yv) via complex determination of the complex eigenvalue matrix according to the relationship Y.sub.μ
+jYv =TΩ
T-1, anddetermining the incidence directions, represented by the azimuth and elevation angle by the relationships ω
.sub.μ
k =tan (μ
k /2),=tan (vk /2);
μ
k =cos φ
k sin θ
k, vk =sin φ
k sin θ
k, and μ
k =2Π
/λ
·
Δ
x uk, vk =2Π
/λ
·
Δ
y vk. - View Dependent Claims (7)
-
-
16. A receiver device, comprising:
-
an allocated centrosymmetric sensor group, having sensor elements, which receives wavefronts assignable to signal components; and signal-processing means for reconstructing signals distorted by multipath propagation, wherein the receiver device effects 1) determination of the incidence direction of wavefronts associated with respective dominant signal components while ignoring lower-power signal components and interference components by utilizing phase differences occurring between the sensor elements with respect to a wavefront, and reconstruction of the dominant signal components, and 2) using the dominant signal components reconstructed according to measure
1), assignment of the determined dominant signal components to the associated spatially separated signal sources, and reconstruction of the signals by combination of signal components associated with a signal source. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24)
-
Specification