Título:
|
Multiantenna GLR detection of rank-one signals with known power spectral shape under spatially uncorrelated noise
|
Autor/a:
|
Sala Álvarez, José; Vázquez Vilar, Gonzalo; López Valcarce, Roberto; Sedighi, Saeid; Taherpour, Abbas
|
Otros autores:
|
Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions; Universitat Politècnica de Catalunya. SPCOM - Grup de Recerca de Processament del Senyal i Comunicacions |
Abstract:
|
We establish the generalized likelihood ratio (GLR)
test for a Gaussian signal of known power spectral shape and
unknown rank-one spatial signature in additive white Gaussian
noise with an unknown diagonal spatial correlation matrix. This
is motivated by spectrum sensing problems in dynamic spectrum
access, in which the temporal correlation of the primary signal
can be assumed known up to a scaling, and where the noise is
due to an uncalibrated receive array. For spatially independent
identically distributed (i.i.d.) noise, the corresponding GLR test
reduces to a scalar optimization problem, whereas the GLR detector
in the general non-i.i.d. case yields a more involved expression,
which can be computed via alternating optimization methods. Low
signal-to-noise ratio (SNR) approximations to the detectors are
given, together with an asymptotic analysis showing the influence
on detection performance of the signal power spectrum and SNR
distribution across antennas. Under spatial rank-P conditions, we
show that the rank-one GLR detectors are consistent with a statistical
criterion that maximizes the output energy of a beamformer
operating on filtered data. Simulation results support our theoretical
findings in that exploiting prior knowledge on the signal power
spectrum can result in significant performance improvement. |
Abstract:
|
Peer Reviewed |
Materia(s):
|
-Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica::Antenes i agrupacions d'antenes -Antennas (Electronics) -Cognitive radio networks -GLRT -Detection -Spectrum sensing -Cognitive radio -Multiple antenna -Uncalibrated array -Antenes (Electrònica) -Ràdio cognitiva |
Derechos:
|
http://creativecommons.org/licenses/by-nc-nd/3.0/es/ |
Tipo de documento:
|
Artículo - Versión publicada Artículo |
Compartir:
|
|