---
_id: '40804'
abstract:
- lang: eng
text: This paper advocates that the convergent systems property and incremental
stability are two intimately related though different properties. Sufficient conditions
for the convergent systems property usually rely upon first showing that a system
is incrementally stable, as e.g. in the celebrated Demidovich condition. However,
in the current paper it is shown that incremental stability itself does not imply
the convergence property, or vice versa. Moreover, characterizations of both properties
in terms of Lyapunov functions are given. Based on these characterizations, it
is established that the convergence property implies incremental stability for
systems evolving oncompact sets, and also when a suitable uniformity condition
is satisfied.
author:
- first_name: Björn S.
full_name: Rüffer, Björn S.
last_name: Rüffer
- first_name: Nathan
full_name: van de Wouw, Nathan
last_name: van de Wouw
- first_name: Markus
full_name: Mueller, Markus
last_name: Mueller
citation:
ama: 'Rüffer BS, van de Wouw N, Mueller M. From convergent dynamics to incremental
stability. In: Proc. 51st IEEE Conf. Decis. Control. ; 2012:2958–2963.'
apa: Rüffer, B. S., van de Wouw, N., & Mueller, M. (2012). From convergent dynamics
to incremental stability. Proc. 51st IEEE Conf. Decis. Control, 2958–2963.
bibtex: '@inproceedings{Rüffer_van de Wouw_Mueller_2012, place={Maui, Hawaii, USA},
title={From convergent dynamics to incremental stability}, booktitle={Proc. 51st
IEEE Conf. Decis. Control}, author={Rüffer, Björn S. and van de Wouw, Nathan and
Mueller, Markus}, year={2012}, pages={2958–2963} }'
chicago: Rüffer, Björn S., Nathan van de Wouw, and Markus Mueller. “From Convergent
Dynamics to Incremental Stability.” In Proc. 51st IEEE Conf. Decis. Control,
2958–2963. Maui, Hawaii, USA, 2012.
ieee: B. S. Rüffer, N. van de Wouw, and M. Mueller, “From convergent dynamics to
incremental stability,” in Proc. 51st IEEE Conf. Decis. Control, 2012,
pp. 2958–2963.
mla: Rüffer, Björn S., et al. “From Convergent Dynamics to Incremental Stability.”
Proc. 51st IEEE Conf. Decis. Control, 2012, pp. 2958–2963.
short: 'B.S. Rüffer, N. van de Wouw, M. Mueller, in: Proc. 51st IEEE Conf. Decis.
Control, Maui, Hawaii, USA, 2012, pp. 2958–2963.'
date_created: 2023-01-30T11:51:55Z
date_updated: 2023-01-30T11:58:31Z
department:
- _id: '263'
page: 2958–2963
place: Maui, Hawaii, USA
publication: Proc. 51st IEEE Conf. Decis. Control
status: public
title: From convergent dynamics to incremental stability
type: conference
user_id: '43497'
year: '2012'
...
---
_id: '40808'
abstract:
- lang: eng
text: The monogenic signal allows us to decompose a two-dimensional real signal
into a local amplitude, a local orientation, and a local phase. In this paper,
we introduce the random monogenic signal and study its second-order statistical
properties. The monogenic signal may be represented as a quaternion-valued signal.
We show that for homogeneous random fields, we need exactly two quaternion-valued
covariance functions for a complete second-order description. We also introduce
a stochastic model for unidirectional signals and a measure of unidirectionality.
author:
- first_name: S. C.
full_name: Olhede, S. C.
last_name: Olhede
- first_name: D.
full_name: Ramírez, D.
last_name: Ramírez
- first_name: P. J.
full_name: Schreier, P. J.
last_name: Schreier
citation:
ama: 'Olhede SC, Ramírez D, Schreier PJ. The Random Monogenic Signal. In: Proc.\
IEEE Int.\ Conf.\ Image Process. ; 2012. doi:10.1109/ICIP.2012.6467404'
apa: Olhede, S. C., Ramírez, D., & Schreier, P. J. (2012). The Random Monogenic
Signal. Proc.\ IEEE Int.\ Conf.\ Image Process. https://doi.org/10.1109/ICIP.2012.6467404
bibtex: '@inproceedings{Olhede_Ramírez_Schreier_2012, place={Orlando, Florida, USA},
title={The Random Monogenic Signal}, DOI={10.1109/ICIP.2012.6467404},
booktitle={Proc.\ IEEE Int.\ Conf.\ Image Process.}, author={Olhede, S. C. and
Ramírez, D. and Schreier, P. J.}, year={2012} }'
chicago: Olhede, S. C., D. Ramírez, and P. J. Schreier. “The Random Monogenic Signal.”
In Proc.\ IEEE Int.\ Conf.\ Image Process. Orlando, Florida, USA, 2012.
https://doi.org/10.1109/ICIP.2012.6467404.
ieee: 'S. C. Olhede, D. Ramírez, and P. J. Schreier, “The Random Monogenic Signal,”
2012, doi: 10.1109/ICIP.2012.6467404.'
mla: Olhede, S. C., et al. “The Random Monogenic Signal.” Proc.\ IEEE Int.\ Conf.\
Image Process., 2012, doi:10.1109/ICIP.2012.6467404.
short: 'S.C. Olhede, D. Ramírez, P.J. Schreier, in: Proc.\ IEEE Int.\ Conf.\ Image
Process., Orlando, Florida, USA, 2012.'
date_created: 2023-01-30T11:51:55Z
date_updated: 2023-01-30T11:58:33Z
department:
- _id: '263'
doi: 10.1109/ICIP.2012.6467404
place: Orlando, Florida, USA
publication: Proc.\ IEEE Int.\ Conf.\ Image Process.
status: public
title: The Random Monogenic Signal
type: conference
user_id: '43497'
year: '2012'
...
---
_id: '40805'
abstract:
- lang: eng
text: We study the instantaneous frequency (IF) of continuous-time, complex-valued,
zero-mean, proper, mean-square differentiable, nonstationary Gaussian stochastic
processes. We compute the probability density function for the IF for fixed time,
which generalizes a result known for wide-sense stationary processes to nonstationary
processes. For a fixed point in time, the IF has either zero or infinite variance.
For harmonizable processes, we obtain as a consequence the result that the mean
of the IF, for fixed time, is the normalized first-order frequency moment of the
Wigner spectrum.
author:
- first_name: Patrik
full_name: Wahlberg, Patrik
last_name: Wahlberg
- first_name: Peter J.
full_name: Schreier, Peter J.
last_name: Schreier
citation:
ama: Wahlberg P, Schreier PJ. On the instantaneous frequency of Gaussian stochastic
processes. Probab\ Math\ Statist. 2012;32:69–92.
apa: Wahlberg, P., & Schreier, P. J. (2012). On the instantaneous frequency
of Gaussian stochastic processes. Probab.\ Math.\ Statist., 32,
69–92.
bibtex: '@article{Wahlberg_Schreier_2012, title={On the instantaneous frequency
of Gaussian stochastic processes}, volume={32}, journal={Probab.\ Math.\ Statist.},
author={Wahlberg, Patrik and Schreier, Peter J.}, year={2012}, pages={69–92} }'
chicago: 'Wahlberg, Patrik, and Peter J. Schreier. “On the Instantaneous Frequency
of Gaussian Stochastic Processes.” Probab.\ Math.\ Statist. 32 (2012):
69–92.'
ieee: P. Wahlberg and P. J. Schreier, “On the instantaneous frequency of Gaussian
stochastic processes,” Probab.\ Math.\ Statist., vol. 32, pp. 69–92, 2012.
mla: Wahlberg, Patrik, and Peter J. Schreier. “On the Instantaneous Frequency of
Gaussian Stochastic Processes.” Probab.\ Math.\ Statist., vol. 32, 2012,
pp. 69–92.
short: P. Wahlberg, P.J. Schreier, Probab.\ Math.\ Statist. 32 (2012) 69–92.
date_created: 2023-01-30T11:51:55Z
date_updated: 2023-01-30T11:58:29Z
department:
- _id: '263'
intvolume: ' 32'
page: 69–92
publication: Probab.\ Math.\ Statist.
status: public
title: On the instantaneous frequency of Gaussian stochastic processes
type: journal_article
user_id: '43497'
volume: 32
year: '2012'
...
---
_id: '40806'
abstract:
- lang: eng
text: This work reports on the implementation of different absorption micro-filters
based on a dye-doped hybrid organic-inorganic xerogel polymeric material synthesized
by the sol-gel process. Microstructures containing eight different filter widths
were fabricated in polydimethylsiloxane (PDMS), bonded to glass substrates and
filled with the corresponding dye doped polymeric material by a soft lithography
approach. The filtering capacity as a function of dye concentration and filter
width was studied and revealed a linear dependence with both parameters, as expected
according to the Beer-Lambert law. Zero passband transmittance values and relatively
sharp stopband regions were achieved with all the filters, also showing rejection
levels between ?6 dB and ?55 dB. Finally, such filters were monolithically integrated
into a disposable fluorescence-based photonic lab-on-a-chip (PhLoC) approach.
Calibration curves carried out with a model fluorophore target analyte showed
an over two-fold increase in sensitivity and a thirty-fold decrease of the limit
of detection (LOD) compared with the values recorded using the same PhLoC system
but without the polymeric filter structure. The results presented herein clearly
indicate the feasibility of these xerogel-based absorbance filtering structures
for being applied as low-cost optical components that can be easily incorporated
into disposable fluorescence-based photonic lab on a chip systems
author:
- first_name: Ester
full_name: Carregal-Romero, Ester
last_name: Carregal-Romero
- first_name: Cesar
full_name: Fernandez-Sanchez, Cesar
last_name: Fernandez-Sanchez
- first_name: Alma
full_name: Eguizabal, Alma
last_name: Eguizabal
- first_name: Stefanie
full_name: Demming, Stefanie
last_name: Demming
- first_name: Stephanus
full_name: Büttgenbach, Stephanus
last_name: Büttgenbach
- first_name: Andreu
full_name: Llobera, Andreu
last_name: Llobera
citation:
ama: Carregal-Romero E, Fernandez-Sanchez C, Eguizabal A, Demming S, Büttgenbach
S, Llobera A. Development and integration of xerogel polymeric absorbance micro-filters
into lab-onchip systems. Opt Express. 2012;20(21):23700–23719. doi:10.1364/OE.20.023700
apa: Carregal-Romero, E., Fernandez-Sanchez, C., Eguizabal, A., Demming, S., Büttgenbach,
S., & Llobera, A. (2012). Development and integration of xerogel polymeric
absorbance micro-filters into lab-onchip systems. Opt. Express, 20(21),
23700–23719. https://doi.org/10.1364/OE.20.023700
bibtex: '@article{Carregal-Romero_Fernandez-Sanchez_Eguizabal_Demming_Büttgenbach_Llobera_2012,
title={Development and integration of xerogel polymeric absorbance micro-filters
into lab-onchip systems}, volume={20}, DOI={10.1364/OE.20.023700},
number={21}, journal={Opt. Express}, author={Carregal-Romero, Ester and Fernandez-Sanchez,
Cesar and Eguizabal, Alma and Demming, Stefanie and Büttgenbach, Stephanus and
Llobera, Andreu}, year={2012}, pages={23700–23719} }'
chicago: 'Carregal-Romero, Ester, Cesar Fernandez-Sanchez, Alma Eguizabal, Stefanie
Demming, Stephanus Büttgenbach, and Andreu Llobera. “Development and Integration
of Xerogel Polymeric Absorbance Micro-Filters into Lab-Onchip Systems.” Opt.
Express 20, no. 21 (2012): 23700–23719. https://doi.org/10.1364/OE.20.023700.'
ieee: 'E. Carregal-Romero, C. Fernandez-Sanchez, A. Eguizabal, S. Demming, S. Büttgenbach,
and A. Llobera, “Development and integration of xerogel polymeric absorbance micro-filters
into lab-onchip systems,” Opt. Express, vol. 20, no. 21, pp. 23700–23719,
2012, doi: 10.1364/OE.20.023700.'
mla: Carregal-Romero, Ester, et al. “Development and Integration of Xerogel Polymeric
Absorbance Micro-Filters into Lab-Onchip Systems.” Opt. Express, vol. 20,
no. 21, 2012, pp. 23700–23719, doi:10.1364/OE.20.023700.
short: E. Carregal-Romero, C. Fernandez-Sanchez, A. Eguizabal, S. Demming, S. Büttgenbach,
A. Llobera, Opt. Express 20 (2012) 23700–23719.
date_created: 2023-01-30T11:51:55Z
date_updated: 2023-01-30T11:57:09Z
department:
- _id: '263'
doi: 10.1364/OE.20.023700
intvolume: ' 20'
issue: '21'
page: 23700–23719
publication: Opt. Express
status: public
title: Development and integration of xerogel polymeric absorbance micro-filters into
lab-onchip systems
type: journal_article
user_id: '43497'
volume: 20
year: '2012'
...
---
_id: '40809'
abstract:
- lang: eng
text: Interference alignment (IA) has been shown to achieve the maximum degrees
of freedom in the multiple-input multiple-output (MIMO) K-user interference channel
(IFC). In the presence of frequency-selective channels, orthogonal frequency-division
multiplexing (OFDM) is typically used to deal with the multipath nature of the
channel. While IA techniques can be applied in a per-subcarrier basis (post-FFT),
the existence of symbol timing offsets (STOs) between the desired and the interfering
OFDM symbols decreases the system performance dramatically. To solve this problem,
we design pre-FFT precoders and decoders for single-beam MIMO IFCs for OFDM transmissions.
Since the IA decoders operate before the FFT, they mitigate the interference before
synchronization takes place. We show that our proposed scheme improves the system
performance when STOs occur, in comparison with traditional post-FFT IA techniques.
We provide simulation results to compare post- and pre-FFT beamforming techniques
and to illustrate the performance of the proposed method.
author:
- first_name: Christian
full_name: Lameiro, Christian
last_name: Lameiro
- first_name: Javier
full_name: Vía, Javier
last_name: Vía
- first_name: Ignacio
full_name: Santamaría, Ignacio
last_name: Santamaría
- first_name: Robert W.
full_name: Heath Jr., Robert W.
last_name: Heath Jr.
citation:
ama: 'Lameiro C, Vía J, Santamaría I, Heath Jr. RW. Pre- and Post-FFT Interference
Leakage Minimization for MIMO OFDM Networks. In: Proc. Int. Symp. Wireless
Comm. Syst. ; 2012. doi:10.1109/ISWCS.2012.6328429'
apa: Lameiro, C., Vía, J., Santamaría, I., & Heath Jr., R. W. (2012). Pre- and
Post-FFT Interference Leakage Minimization for MIMO OFDM Networks. Proc. Int.
Symp. Wireless Comm. Syst. https://doi.org/10.1109/ISWCS.2012.6328429
bibtex: '@inproceedings{Lameiro_Vía_Santamaría_Heath Jr._2012, place={Paris, France},
title={Pre- and Post-FFT Interference Leakage Minimization for MIMO OFDM Networks},
DOI={10.1109/ISWCS.2012.6328429},
booktitle={Proc. Int. Symp. Wireless Comm. Syst.}, author={Lameiro, Christian
and Vía, Javier and Santamaría, Ignacio and Heath Jr., Robert W.}, year={2012}
}'
chicago: Lameiro, Christian, Javier Vía, Ignacio Santamaría, and Robert W. Heath
Jr. “Pre- and Post-FFT Interference Leakage Minimization for MIMO OFDM Networks.”
In Proc. Int. Symp. Wireless Comm. Syst. Paris, France, 2012. https://doi.org/10.1109/ISWCS.2012.6328429.
ieee: 'C. Lameiro, J. Vía, I. Santamaría, and R. W. Heath Jr., “Pre- and Post-FFT
Interference Leakage Minimization for MIMO OFDM Networks,” 2012, doi: 10.1109/ISWCS.2012.6328429.'
mla: Lameiro, Christian, et al. “Pre- and Post-FFT Interference Leakage Minimization
for MIMO OFDM Networks.” Proc. Int. Symp. Wireless Comm. Syst., 2012, doi:10.1109/ISWCS.2012.6328429.
short: 'C. Lameiro, J. Vía, I. Santamaría, R.W. Heath Jr., in: Proc. Int. Symp.
Wireless Comm. Syst., Paris, France, 2012.'
date_created: 2023-01-30T11:51:55Z
date_updated: 2023-01-30T11:57:07Z
department:
- _id: '263'
doi: 10.1109/ISWCS.2012.6328429
place: Paris, France
publication: Proc. Int. Symp. Wireless Comm. Syst.
status: public
title: Pre- and Post-FFT Interference Leakage Minimization for MIMO OFDM Networks
type: conference
user_id: '43497'
year: '2012'
...
---
_id: '40813'
abstract:
- lang: eng
text: In this paper, the problem of multiantenna spectrum sensing in cognitive radio
(CR) is addressed within a Bayesian framework. Unlike previous works, our Bayesian
model places priors directly on the spatial covariance matrices under both hypotheses,
as well as on the probability of channel occupancy. Specifically, we use inverse-gamma
and complex inverse-Wishart distributions as conjugate priors for the null and
alternative hypotheses, respectively; and a Bernoulli distribution as the prior
for channel occupancy. At each sensing period, Bayesian inference is applied and
the posterior of channel occupancy is thresholded for detection. After a suitable
approximation, the posteriors are employed as priors for the next sensing frame,
which can be beneficial in slowly time-varying environments. By means of simulations,
the proposed detector is shown to outperform the Generalized Likelihood Ratio
Test (GLRT) detector.
author:
- first_name: J.
full_name: Manco-Vásquez, J.
last_name: Manco-Vásquez
- first_name: M.
full_name: Lazaro-Gredilla, M.
last_name: Lazaro-Gredilla
- first_name: D.
full_name: Ramírez, D.
last_name: Ramírez
- first_name: J.
full_name: Vía, J.
last_name: Vía
- first_name: I.
full_name: Santamaría, I.
last_name: Santamaría
citation:
ama: 'Manco-Vásquez J, Lazaro-Gredilla M, Ramírez D, Vía J, Santamaría I. Bayesian
Multiantenna Sensing for Cognitive Radio. In: Proc.\ IEEE Sensor Array and
Multichannel Signal Process. Work. ; 2012. doi:10.1109/SAM.2012.6250566'
apa: Manco-Vásquez, J., Lazaro-Gredilla, M., Ramírez, D., Vía, J., & Santamaría,
I. (2012). Bayesian Multiantenna Sensing for Cognitive Radio. Proc.\ IEEE Sensor
Array and Multichannel Signal Process. Work. https://doi.org/10.1109/SAM.2012.6250566
bibtex: '@inproceedings{Manco-Vásquez_Lazaro-Gredilla_Ramírez_Vía_Santamaría_2012,
place={Hoboken, NJ, USA}, title={Bayesian Multiantenna Sensing for Cognitive Radio},
DOI={10.1109/SAM.2012.6250566},
booktitle={Proc.\ IEEE Sensor Array and Multichannel Signal Process. Work.}, author={Manco-Vásquez,
J. and Lazaro-Gredilla, M. and Ramírez, D. and Vía, J. and Santamaría, I.}, year={2012}
}'
chicago: Manco-Vásquez, J., M. Lazaro-Gredilla, D. Ramírez, J. Vía, and I. Santamaría.
“Bayesian Multiantenna Sensing for Cognitive Radio.” In Proc.\ IEEE Sensor
Array and Multichannel Signal Process. Work. Hoboken, NJ, USA, 2012. https://doi.org/10.1109/SAM.2012.6250566.
ieee: 'J. Manco-Vásquez, M. Lazaro-Gredilla, D. Ramírez, J. Vía, and I. Santamaría,
“Bayesian Multiantenna Sensing for Cognitive Radio,” 2012, doi: 10.1109/SAM.2012.6250566.'
mla: Manco-Vásquez, J., et al. “Bayesian Multiantenna Sensing for Cognitive Radio.”
Proc.\ IEEE Sensor Array and Multichannel Signal Process. Work., 2012,
doi:10.1109/SAM.2012.6250566.
short: 'J. Manco-Vásquez, M. Lazaro-Gredilla, D. Ramírez, J. Vía, I. Santamaría,
in: Proc.\ IEEE Sensor Array and Multichannel Signal Process. Work., Hoboken,
NJ, USA, 2012.'
date_created: 2023-01-30T11:51:56Z
date_updated: 2023-01-30T11:57:17Z
department:
- _id: '263'
doi: 10.1109/SAM.2012.6250566
place: Hoboken, NJ, USA
publication: Proc.\ IEEE Sensor Array and Multichannel Signal Process. Work.
status: public
title: Bayesian Multiantenna Sensing for Cognitive Radio
type: conference
user_id: '43497'
year: '2012'
...
---
_id: '40814'
abstract:
- lang: eng
text: In this paper we propose an efficient transmission strategy for the two-way
relay channel (TWRC) with multiple relays, when these are multiple-input multiple-output
(MIMO) transceivers that apply the amplify-and-forward (AF) protocol. Although
the optimal beamforming strategy is known, it requires a central node, with channel
state information (CSI) of the entire network, to compute all the beamforming
matrices, which is impractical. To reduce the overhead, in this paper we present
a distributed algorithm for the computation of the relay beamforming matrices.
The proposed algorithm divides the problem in two stages. First, each relay computes
its own beamforming matrix in parallel using only local CSI. Next, a distributed
beamforming is applied to make the signals add up coherently at the nodes. Although
the proposed algorithm is suboptimal, we show through simulations that it performs
very close to the optimal achievable rate region.
author:
- first_name: Christian
full_name: Lameiro, Christian
last_name: Lameiro
- first_name: Javier
full_name: Vía, Javier
last_name: Vía
- first_name: Ignacio
full_name: Santamaría, Ignacio
last_name: Santamaría
citation:
ama: 'Lameiro C, Vía J, Santamaría I. A Distributed Algorithm for Two-Way Multiple-Relay
Networks. In: Proc.\ IEEE Sensor Array and Multichannel Signal Process. Work.
; 2012. doi:10.1109/SAM.2012.6250440'
apa: Lameiro, C., Vía, J., & Santamaría, I. (2012). A Distributed Algorithm
for Two-Way Multiple-Relay Networks. Proc.\ IEEE Sensor Array and Multichannel
Signal Process. Work. https://doi.org/10.1109/SAM.2012.6250440
bibtex: '@inproceedings{Lameiro_Vía_Santamaría_2012, place={Hoboken, NJ, USA}, title={A
Distributed Algorithm for Two-Way Multiple-Relay Networks}, DOI={10.1109/SAM.2012.6250440},
booktitle={Proc.\ IEEE Sensor Array and Multichannel Signal Process. Work.}, author={Lameiro,
Christian and Vía, Javier and Santamaría, Ignacio}, year={2012} }'
chicago: Lameiro, Christian, Javier Vía, and Ignacio Santamaría. “A Distributed
Algorithm for Two-Way Multiple-Relay Networks.” In Proc.\ IEEE Sensor Array
and Multichannel Signal Process. Work. Hoboken, NJ, USA, 2012. https://doi.org/10.1109/SAM.2012.6250440.
ieee: 'C. Lameiro, J. Vía, and I. Santamaría, “A Distributed Algorithm for Two-Way
Multiple-Relay Networks,” 2012, doi: 10.1109/SAM.2012.6250440.'
mla: Lameiro, Christian, et al. “A Distributed Algorithm for Two-Way Multiple-Relay
Networks.” Proc.\ IEEE Sensor Array and Multichannel Signal Process. Work.,
2012, doi:10.1109/SAM.2012.6250440.
short: 'C. Lameiro, J. Vía, I. Santamaría, in: Proc.\ IEEE Sensor Array and Multichannel
Signal Process. Work., Hoboken, NJ, USA, 2012.'
date_created: 2023-01-30T11:51:56Z
date_updated: 2023-01-30T11:57:15Z
department:
- _id: '263'
doi: 10.1109/SAM.2012.6250440
place: Hoboken, NJ, USA
publication: Proc.\ IEEE Sensor Array and Multichannel Signal Process. Work.
status: public
title: A Distributed Algorithm for Two-Way Multiple-Relay Networks
type: conference
user_id: '43497'
year: '2012'
...
---
_id: '40816'
abstract:
- lang: eng
text: Textural analysis of tissue scattering images is proposed for healthy versus
tumor discrimination. Scattering center density varies from normal to tumor tissues
and this variation is translated into different textures in the scattering power
map. Adipose tissue shows low autocorrelation values while tumor tissues present
higher entropies than normal tissue. Consequently, a combination of autocorrelation
and entropy values allows ready tissue discrimination by a supervised linear classifier.
The proposed approach has been validated over a set of 29 breast tissue samples
achieving a sensitivity of 73.59% and specificity of 82.40%.
author:
- first_name: Alma
full_name: Eguizabal, Alma
last_name: Eguizabal
- first_name: Ashley M.
full_name: Laughney, Ashley M.
last_name: Laughney
- first_name: P. Beatriz
full_name: Garcia-Allende, P. Beatriz
last_name: Garcia-Allende
- first_name: Venkataramanan
full_name: Krishnaswamy, Venkataramanan
last_name: Krishnaswamy
- first_name: Wendy A.
full_name: Wells, Wendy A.
last_name: Wells
- first_name: Keith D.
full_name: Paulsen, Keith D.
last_name: Paulsen
- first_name: Brian W.
full_name: Pogue, Brian W.
last_name: Pogue
- first_name: Jose M.
full_name: Lopez-Higuera, Jose M.
last_name: Lopez-Higuera
- first_name: Olga M.
full_name: Conde, Olga M.
last_name: Conde
citation:
ama: 'Eguizabal A, Laughney AM, Garcia-Allende PB, et al. Textural analysis of optical
scattering for identification of cancer in breast surgical specimens. In: IEEE
9th International Symposium on Biomedical Imaging. ; 2012.'
apa: Eguizabal, A., Laughney, A. M., Garcia-Allende, P. B., Krishnaswamy, V., Wells,
W. A., Paulsen, K. D., Pogue, B. W., Lopez-Higuera, J. M., & Conde, O. M.
(2012). Textural analysis of optical scattering for identification of cancer in
breast surgical specimens. IEEE 9th International Symposium on Biomedical Imaging.
bibtex: '@inproceedings{Eguizabal_Laughney_Garcia-Allende_Krishnaswamy_Wells_Paulsen_Pogue_Lopez-Higuera_Conde_2012,
place={Barcelona, Spain}, title={Textural analysis of optical scattering for identification
of cancer in breast surgical specimens}, booktitle={IEEE 9th International Symposium
on Biomedical Imaging}, author={Eguizabal, Alma and Laughney, Ashley M. and Garcia-Allende,
P. Beatriz and Krishnaswamy, Venkataramanan and Wells, Wendy A. and Paulsen, Keith
D. and Pogue, Brian W. and Lopez-Higuera, Jose M. and Conde, Olga M.}, year={2012}
}'
chicago: Eguizabal, Alma, Ashley M. Laughney, P. Beatriz Garcia-Allende, Venkataramanan
Krishnaswamy, Wendy A. Wells, Keith D. Paulsen, Brian W. Pogue, Jose M. Lopez-Higuera,
and Olga M. Conde. “Textural Analysis of Optical Scattering for Identification
of Cancer in Breast Surgical Specimens.” In IEEE 9th International Symposium
on Biomedical Imaging. Barcelona, Spain, 2012.
ieee: A. Eguizabal et al., “Textural analysis of optical scattering for identification
of cancer in breast surgical specimens,” 2012.
mla: Eguizabal, Alma, et al. “Textural Analysis of Optical Scattering for Identification
of Cancer in Breast Surgical Specimens.” IEEE 9th International Symposium on
Biomedical Imaging, 2012.
short: 'A. Eguizabal, A.M. Laughney, P.B. Garcia-Allende, V. Krishnaswamy, W.A.
Wells, K.D. Paulsen, B.W. Pogue, J.M. Lopez-Higuera, O.M. Conde, in: IEEE 9th
International Symposium on Biomedical Imaging, Barcelona, Spain, 2012.'
date_created: 2023-01-30T11:51:56Z
date_updated: 2023-01-30T11:57:13Z
department:
- _id: '263'
place: Barcelona, Spain
publication: IEEE 9th International Symposium on Biomedical Imaging
status: public
title: Textural analysis of optical scattering for identification of cancer in breast
surgical specimens
type: conference
user_id: '43497'
year: '2012'
...
---
_id: '40815'
abstract:
- lang: eng
text: A surgeon-guided independent component analysis from optical reflectance measurements
is proposed for breast tumor delineation. Independent Component Analysis is first
applied to extract the most relevant features from local measures of broadband
reflectance and then a tumor probability indicator is obtained and provided utilizing
surgeon assistance to resolve the inherent ambiguities in the independent component
calculation. A set of 29 breast tissue samples have been diagnosed achieving a
sensitivity of 90.57%, and specificity of 93.98%.
author:
- first_name: Alma
full_name: Eguizabal, Alma
last_name: Eguizabal
- first_name: Ashley M.
full_name: Laughney, Ashley M.
last_name: Laughney
- first_name: P. Beatriz
full_name: Garcia-Allende, P. Beatriz
last_name: Garcia-Allende
- first_name: Venkataramanan
full_name: Krishnaswamy, Venkataramanan
last_name: Krishnaswamy
- first_name: Wendy A.
full_name: Wells, Wendy A.
last_name: Wells
- first_name: Keith D.
full_name: Paulsen, Keith D.
last_name: Paulsen
- first_name: Brian W.
full_name: Pogue, Brian W.
last_name: Pogue
- first_name: Jose M.
full_name: Lopez-Higuera, Jose M.
last_name: Lopez-Higuera
- first_name: Olga M.
full_name: Conde, Olga M.
last_name: Conde
citation:
ama: 'Eguizabal A, Laughney AM, Garcia-Allende PB, et al. ICA-guided delineation
of breast cancer pathology. In: IEEE 9th International Symposium on Biomedical
Imaging. ; 2012.'
apa: Eguizabal, A., Laughney, A. M., Garcia-Allende, P. B., Krishnaswamy, V., Wells,
W. A., Paulsen, K. D., Pogue, B. W., Lopez-Higuera, J. M., & Conde, O. M.
(2012). ICA-guided delineation of breast cancer pathology. IEEE 9th International
Symposium on Biomedical Imaging.
bibtex: '@inproceedings{Eguizabal_Laughney_Garcia-Allende_Krishnaswamy_Wells_Paulsen_Pogue_Lopez-Higuera_Conde_2012,
place={Barcelona, Spain}, title={ICA-guided delineation of breast cancer pathology},
booktitle={IEEE 9th International Symposium on Biomedical Imaging}, author={Eguizabal,
Alma and Laughney, Ashley M. and Garcia-Allende, P. Beatriz and Krishnaswamy,
Venkataramanan and Wells, Wendy A. and Paulsen, Keith D. and Pogue, Brian W. and
Lopez-Higuera, Jose M. and Conde, Olga M.}, year={2012} }'
chicago: Eguizabal, Alma, Ashley M. Laughney, P. Beatriz Garcia-Allende, Venkataramanan
Krishnaswamy, Wendy A. Wells, Keith D. Paulsen, Brian W. Pogue, Jose M. Lopez-Higuera,
and Olga M. Conde. “ICA-Guided Delineation of Breast Cancer Pathology.” In IEEE
9th International Symposium on Biomedical Imaging. Barcelona, Spain, 2012.
ieee: A. Eguizabal et al., “ICA-guided delineation of breast cancer pathology,”
2012.
mla: Eguizabal, Alma, et al. “ICA-Guided Delineation of Breast Cancer Pathology.”
IEEE 9th International Symposium on Biomedical Imaging, 2012.
short: 'A. Eguizabal, A.M. Laughney, P.B. Garcia-Allende, V. Krishnaswamy, W.A.
Wells, K.D. Paulsen, B.W. Pogue, J.M. Lopez-Higuera, O.M. Conde, in: IEEE 9th
International Symposium on Biomedical Imaging, Barcelona, Spain, 2012.'
date_created: 2023-01-30T11:51:56Z
date_updated: 2023-01-30T11:57:11Z
department:
- _id: '263'
place: Barcelona, Spain
publication: IEEE 9th International Symposium on Biomedical Imaging
status: public
title: ICA-guided delineation of breast cancer pathology
type: conference
user_id: '43497'
year: '2012'
...
---
_id: '40803'
abstract:
- lang: eng
text: This paper considers nonlinear dynamical networks consisting of individually
iISS (integral input-to-statestable) subsystems which are not necessarily ISS
(input-to-statestable). Stability criteria for internal and external stability
of the networks are developed in view of both necessity and sufficiency. For the
sufficiency, we show how we can construct a Lyapunov function of the network explicitly
under the assumption that a cyclic small-gain condition is satisfied. The cyclic
small-gain condition is shown to be equivalent to a matrix-like condition. The
two conditions and their equivalence precisely generalize some central ISS results
in the literature. Moreover, the necessity of the matrix-like condition is established.
The allowable number of non-ISS subsystems for stability of the network is discussed
through several necessity conditions.
author:
- first_name: Hiroshi
full_name: Ito, Hiroshi
last_name: Ito
- first_name: Zhong-Ping
full_name: Jiang, Zhong-Ping
last_name: Jiang
- first_name: Sergey N.
full_name: Dashkovskiy, Sergey N.
last_name: Dashkovskiy
- first_name: Björn S.
full_name: Rüffer, Björn S.
last_name: Rüffer
citation:
ama: 'Ito H, Jiang Z-P, Dashkovskiy SN, Rüffer BS. A cyclic small-gain condition
and an equivalent matrix-like criterion for iISS networks. In: Proc. 51st IEEE
Conf. Decis. Control. ; 2012:4158–4164.'
apa: Ito, H., Jiang, Z.-P., Dashkovskiy, S. N., & Rüffer, B. S. (2012). A cyclic
small-gain condition and an equivalent matrix-like criterion for iISS networks.
Proc. 51st IEEE Conf. Decis. Control, 4158–4164.
bibtex: '@inproceedings{Ito_Jiang_Dashkovskiy_Rüffer_2012, place={Maui, Hawaii,
USA}, title={A cyclic small-gain condition and an equivalent matrix-like criterion
for iISS networks}, booktitle={Proc. 51st IEEE Conf. Decis. Control}, author={Ito,
Hiroshi and Jiang, Zhong-Ping and Dashkovskiy, Sergey N. and Rüffer, Björn S.},
year={2012}, pages={4158–4164} }'
chicago: Ito, Hiroshi, Zhong-Ping Jiang, Sergey N. Dashkovskiy, and Björn S. Rüffer.
“A Cyclic Small-Gain Condition and an Equivalent Matrix-like Criterion for IISS
Networks.” In Proc. 51st IEEE Conf. Decis. Control, 4158–4164. Maui, Hawaii,
USA, 2012.
ieee: H. Ito, Z.-P. Jiang, S. N. Dashkovskiy, and B. S. Rüffer, “A cyclic small-gain
condition and an equivalent matrix-like criterion for iISS networks,” in Proc.
51st IEEE Conf. Decis. Control, 2012, pp. 4158–4164.
mla: Ito, Hiroshi, et al. “A Cyclic Small-Gain Condition and an Equivalent Matrix-like
Criterion for IISS Networks.” Proc. 51st IEEE Conf. Decis. Control, 2012,
pp. 4158–4164.
short: 'H. Ito, Z.-P. Jiang, S.N. Dashkovskiy, B.S. Rüffer, in: Proc. 51st IEEE
Conf. Decis. Control, Maui, Hawaii, USA, 2012, pp. 4158–4164.'
date_created: 2023-01-30T11:51:54Z
date_updated: 2023-01-30T11:58:14Z
department:
- _id: '263'
page: 4158–4164
place: Maui, Hawaii, USA
publication: Proc. 51st IEEE Conf. Decis. Control
status: public
title: A cyclic small-gain condition and an equivalent matrix-like criterion for iISS
networks
type: conference
user_id: '43497'
year: '2012'
...
---
_id: '40802'
abstract:
- lang: eng
text: This invited paper is a significantly shortened excerpt of the article S.
N. DASHKOVSKIY, B. S. RÜFFER, AND F. R. WIRTH, Small gain theorems for large scale
systems and construction of ISS Lyapunov functions, SIAM J. Control Optim., 48
(2010), pp. 4089–4118. We consider interconnections of n nonlinear subsystems
in the input-to-state stability (ISS) framework. Foreach subsystem an ISS Lyapunov
function is given that treats the other subsystems as independent inputs. A gain
matrix is used to encode the mutual dependencies of the systems in the network.
Under a small gain assumption on the monotone operator induced by the gain matrix,
a locally Lipschitz continuous ISS Lyapunov function is obtained constructively
for the entire network by appropriately scaling the individualLyapunov functions
for the subsystems.
author:
- first_name: Sergey N.
full_name: Dashkovskiy, Sergey N.
last_name: Dashkovskiy
- first_name: Björn S.
full_name: Rüffer, Björn S.
last_name: Rüffer
- first_name: Fabian R.
full_name: Wirth, Fabian R.
last_name: Wirth
citation:
ama: 'Dashkovskiy SN, Rüffer BS, Wirth FR. Small gain theorems for large scale systems
and construction of ISS Lyapunov functions. In: Proc. 51st IEEE Conf. Decis.
Control. ; 2012:4165–4170.'
apa: Dashkovskiy, S. N., Rüffer, B. S., & Wirth, F. R. (2012). Small gain theorems
for large scale systems and construction of ISS Lyapunov functions. Proc. 51st
IEEE Conf. Decis. Control, 4165–4170.
bibtex: '@inproceedings{Dashkovskiy_Rüffer_Wirth_2012, place={Maui, Hawaii, USA},
title={Small gain theorems for large scale systems and construction of ISS Lyapunov
functions}, booktitle={Proc. 51st IEEE Conf. Decis. Control}, author={Dashkovskiy,
Sergey N. and Rüffer, Björn S. and Wirth, Fabian R.}, year={2012}, pages={4165–4170}
}'
chicago: Dashkovskiy, Sergey N., Björn S. Rüffer, and Fabian R. Wirth. “Small Gain
Theorems for Large Scale Systems and Construction of ISS Lyapunov Functions.”
In Proc. 51st IEEE Conf. Decis. Control, 4165–4170. Maui, Hawaii, USA,
2012.
ieee: S. N. Dashkovskiy, B. S. Rüffer, and F. R. Wirth, “Small gain theorems for
large scale systems and construction of ISS Lyapunov functions,” in Proc. 51st
IEEE Conf. Decis. Control, 2012, pp. 4165–4170.
mla: Dashkovskiy, Sergey N., et al. “Small Gain Theorems for Large Scale Systems
and Construction of ISS Lyapunov Functions.” Proc. 51st IEEE Conf. Decis. Control,
2012, pp. 4165–4170.
short: 'S.N. Dashkovskiy, B.S. Rüffer, F.R. Wirth, in: Proc. 51st IEEE Conf. Decis.
Control, Maui, Hawaii, USA, 2012, pp. 4165–4170.'
date_created: 2023-01-30T11:51:54Z
date_updated: 2023-01-30T11:58:12Z
department:
- _id: '263'
page: 4165–4170
place: Maui, Hawaii, USA
publication: Proc. 51st IEEE Conf. Decis. Control
status: public
title: Small gain theorems for large scale systems and construction of ISS Lyapunov
functions
type: conference
user_id: '43497'
year: '2012'
...
---
_id: '40835'
abstract:
- lang: eng
text: This work addresses the problem of deciding whether a set of realizations
of a vector-valued time series with unknown temporal correlation are spatially
correlated or not. Specifically, the spatial correlation is induced by a colored
source over a frequency-flat single-input multiple-output (SIMO) channel distorted
by independent and identically distributed noises with temporal correlation. The
generalized likelihood ratio test (GLRT) for this detection problem does not have
a closed-form expression and we have to resort to numerical optimization techniques.
In particular, we apply the successive convex approximations approach which relies
on solving a series of convex problems that approximate the original (non-convex)
one. The proposed solution resembles a power method for obtaining the dominant
eigenvector of a matrix, which changes over iterations. Finally, the performance
of the proposed detector is illustrated by means of computer simulations showing
a great improvement over previously proposed detectors that do not fully exploit
the temporal structure of the source.
author:
- first_name: D.
full_name: Ramírez, D.
last_name: Ramírez
- first_name: J.
full_name: Vía, J.
last_name: Vía
- first_name: I.
full_name: Santamaría, I.
last_name: Santamaría
- first_name: L. L.
full_name: Scharf, L. L.
last_name: Scharf
citation:
ama: 'Ramírez D, Vía J, Santamaría I, Scharf LL. Multiple-Channel Detection of a
Gaussian Time Series over Frequency-Flat Channels. In: Proc.\ IEEE Int.\ Conf.\
Acoustics, Speech and Signal Process. ; 2011. doi:10.1109/ICASSP.2011.5947194'
apa: Ramírez, D., Vía, J., Santamaría, I., & Scharf, L. L. (2011). Multiple-Channel
Detection of a Gaussian Time Series over Frequency-Flat Channels. Proc.\ IEEE
Int.\ Conf.\ Acoustics, Speech and Signal Process. https://doi.org/10.1109/ICASSP.2011.5947194
bibtex: '@inproceedings{Ramírez_Vía_Santamaría_Scharf_2011, place={Prague, Czech
Republic}, title={Multiple-Channel Detection of a Gaussian Time Series over Frequency-Flat
Channels}, DOI={10.1109/ICASSP.2011.5947194},
booktitle={Proc.\ IEEE Int.\ Conf.\ Acoustics, Speech and Signal Process.}, author={Ramírez,
D. and Vía, J. and Santamaría, I. and Scharf, L. L.}, year={2011} }'
chicago: Ramírez, D., J. Vía, I. Santamaría, and L. L. Scharf. “Multiple-Channel
Detection of a Gaussian Time Series over Frequency-Flat Channels.” In Proc.\
IEEE Int.\ Conf.\ Acoustics, Speech and Signal Process. Prague, Czech Republic,
2011. https://doi.org/10.1109/ICASSP.2011.5947194.
ieee: 'D. Ramírez, J. Vía, I. Santamaría, and L. L. Scharf, “Multiple-Channel Detection
of a Gaussian Time Series over Frequency-Flat Channels,” 2011, doi: 10.1109/ICASSP.2011.5947194.'
mla: Ramírez, D., et al. “Multiple-Channel Detection of a Gaussian Time Series over
Frequency-Flat Channels.” Proc.\ IEEE Int.\ Conf.\ Acoustics, Speech and Signal
Process., 2011, doi:10.1109/ICASSP.2011.5947194.
short: 'D. Ramírez, J. Vía, I. Santamaría, L.L. Scharf, in: Proc.\ IEEE Int.\ Conf.\
Acoustics, Speech and Signal Process., Prague, Czech Republic, 2011.'
date_created: 2023-01-30T11:51:59Z
date_updated: 2023-01-30T11:56:29Z
department:
- _id: '263'
doi: 10.1109/ICASSP.2011.5947194
place: Prague, Czech Republic
publication: Proc.\ IEEE Int.\ Conf.\ Acoustics, Speech and Signal Process.
status: public
title: Multiple-Channel Detection of a Gaussian Time Series over Frequency-Flat Channels
type: conference
user_id: '43497'
year: '2011'
...
---
_id: '40834'
abstract:
- lang: eng
text: Spectrum sensing is a challenging key component of the Cognitive Radio paradigm,
since primary signals must be detected in the face of noise uncertainty and at
signal-to-noise ratios (SNRs) well below decodability levels. Multiantenna detectors
exploit spatial independence of receiver thermal noise to boost detection performance
and robustness. Here, we study the problem of detecting Gaussian signals with
unknown rank-$P$ spatial covariance matrix when the noise at the receiver is independent
across the antennas and with unknown power. A generic diagonal noise covariance
matrix is allowed to model calibration uncertainties in the different antenna
frontends. We derive the generalized likelihood ratio test (GLRT) for this detection
problem. Although, in general, the corresponding statistic must be obtained by
numerical means, in the low SNR regime the GLRT does admit a closed form. Numerical
simulations show that the proposed asymptotic detector offers good performance
even for moderate SNR values.
author:
- first_name: D.
full_name: Ramírez, D.
last_name: Ramírez
- first_name: G.
full_name: Vazquez-Vilar, G.
last_name: Vazquez-Vilar
- first_name: R.
full_name: López-Valcarce, R.
last_name: López-Valcarce
- first_name: J.
full_name: Vía, J.
last_name: Vía
- first_name: I.
full_name: Santamaría, I.
last_name: Santamaría
citation:
ama: 'Ramírez D, Vazquez-Vilar G, López-Valcarce R, Vía J, Santamaría I. Multiantenna
detection under noise uncertainty and primary user’s spatial structure. In: Proc.\
IEEE Int.\ Conf.\ Acoustics, Speech and Signal Process. ; 2011. doi:10.1109/ICASSP.2011.5946275'
apa: Ramírez, D., Vazquez-Vilar, G., López-Valcarce, R., Vía, J., & Santamaría,
I. (2011). Multiantenna detection under noise uncertainty and primary user’s spatial
structure. Proc.\ IEEE Int.\ Conf.\ Acoustics, Speech and Signal Process.
https://doi.org/10.1109/ICASSP.2011.5946275
bibtex: '@inproceedings{Ramírez_Vazquez-Vilar_López-Valcarce_Vía_Santamaría_2011,
place={Prague, Czech Republic}, title={Multiantenna detection under noise uncertainty
and primary user’s spatial structure}, DOI={10.1109/ICASSP.2011.5946275},
booktitle={Proc.\ IEEE Int.\ Conf.\ Acoustics, Speech and Signal Process.}, author={Ramírez,
D. and Vazquez-Vilar, G. and López-Valcarce, R. and Vía, J. and Santamaría, I.},
year={2011} }'
chicago: Ramírez, D., G. Vazquez-Vilar, R. López-Valcarce, J. Vía, and I. Santamaría.
“Multiantenna Detection under Noise Uncertainty and Primary User’s Spatial Structure.”
In Proc.\ IEEE Int.\ Conf.\ Acoustics, Speech and Signal Process. Prague,
Czech Republic, 2011. https://doi.org/10.1109/ICASSP.2011.5946275.
ieee: 'D. Ramírez, G. Vazquez-Vilar, R. López-Valcarce, J. Vía, and I. Santamaría,
“Multiantenna detection under noise uncertainty and primary user’s spatial structure,”
2011, doi: 10.1109/ICASSP.2011.5946275.'
mla: Ramírez, D., et al. “Multiantenna Detection under Noise Uncertainty and Primary
User’s Spatial Structure.” Proc.\ IEEE Int.\ Conf.\ Acoustics, Speech and Signal
Process., 2011, doi:10.1109/ICASSP.2011.5946275.
short: 'D. Ramírez, G. Vazquez-Vilar, R. López-Valcarce, J. Vía, I. Santamaría,
in: Proc.\ IEEE Int.\ Conf.\ Acoustics, Speech and Signal Process., Prague, Czech
Republic, 2011.'
date_created: 2023-01-30T11:51:59Z
date_updated: 2023-01-30T11:56:31Z
department:
- _id: '263'
doi: 10.1109/ICASSP.2011.5946275
place: Prague, Czech Republic
publication: Proc.\ IEEE Int.\ Conf.\ Acoustics, Speech and Signal Process.
status: public
title: Multiantenna detection under noise uncertainty and primary user’s spatial structure
type: conference
user_id: '43497'
year: '2011'
...
---
_id: '40833'
abstract:
- lang: eng
text: In this work, we derive a maximum likelihood formula for beamsteering in a
multi-sensor array. The novelty of the work is that the impinging signal and noises
are wide sense stationary (WSS) time series with unknown power spectral densities,
unlike in previous work that typically considers white signals. Our approach naturally
provides a way of fusing frequency-dependent information to obtain a broadband
beamformer. In order to obtain the compressed likelihood, it is necessary to find
the maximum likelihood estimates of the unknown parameters. However, this problem
turns out to be an ML estimation of a block-Toeplitz matrix, which does not have
a closed-form solution. To overcome this problem, we derive the asymptotic likelihood,
which is given in the frequency domain. Finally, some simulation results are presented
to illustrate the performance of the proposed technique. In these simulations,
it is shown that our approach presents the best results.
author:
- first_name: D.
full_name: Ramírez, D.
last_name: Ramírez
- first_name: J.
full_name: Vía, J.
last_name: Vía
- first_name: I.
full_name: Santamaría, I.
last_name: Santamaría
- first_name: L. L.
full_name: Scharf, L. L.
last_name: Scharf
citation:
ama: 'Ramírez D, Vía J, Santamaría I, Scharf LL. Multi-Sensor Beamsteering Based
on the Asymptotic Likelihood for Colored Signals. In: Proc.\ IEEE Work.\ Stat.\
Signal Process. ; 2011. doi:10.1109/SSP.2011.5967644'
apa: Ramírez, D., Vía, J., Santamaría, I., & Scharf, L. L. (2011). Multi-Sensor
Beamsteering Based on the Asymptotic Likelihood for Colored Signals. Proc.\
IEEE Work.\ Stat.\ Signal Process. https://doi.org/10.1109/SSP.2011.5967644
bibtex: '@inproceedings{Ramírez_Vía_Santamaría_Scharf_2011, place={Nice, France},
title={Multi-Sensor Beamsteering Based on the Asymptotic Likelihood for Colored
Signals}, DOI={10.1109/SSP.2011.5967644},
booktitle={Proc.\ IEEE Work.\ Stat.\ Signal Process.}, author={Ramírez, D. and
Vía, J. and Santamaría, I. and Scharf, L. L.}, year={2011} }'
chicago: Ramírez, D., J. Vía, I. Santamaría, and L. L. Scharf. “Multi-Sensor Beamsteering
Based on the Asymptotic Likelihood for Colored Signals.” In Proc.\ IEEE Work.\
Stat.\ Signal Process. Nice, France, 2011. https://doi.org/10.1109/SSP.2011.5967644.
ieee: 'D. Ramírez, J. Vía, I. Santamaría, and L. L. Scharf, “Multi-Sensor Beamsteering
Based on the Asymptotic Likelihood for Colored Signals,” 2011, doi: 10.1109/SSP.2011.5967644.'
mla: Ramírez, D., et al. “Multi-Sensor Beamsteering Based on the Asymptotic Likelihood
for Colored Signals.” Proc.\ IEEE Work.\ Stat.\ Signal Process., 2011,
doi:10.1109/SSP.2011.5967644.
short: 'D. Ramírez, J. Vía, I. Santamaría, L.L. Scharf, in: Proc.\ IEEE Work.\ Stat.\
Signal Process., Nice, France, 2011.'
date_created: 2023-01-30T11:51:59Z
date_updated: 2023-01-30T11:56:26Z
department:
- _id: '263'
doi: 10.1109/SSP.2011.5967644
place: Nice, France
publication: Proc.\ IEEE Work.\ Stat.\ Signal Process.
status: public
title: Multi-Sensor Beamsteering Based on the Asymptotic Likelihood for Colored Signals
type: conference
user_id: '43497'
year: '2011'
...
---
_id: '40836'
abstract:
- lang: eng
text: In this paper we study the multiple-input multiple-output two-way relay channel
(MIMO-TWRC) when the nodes use analog beamforming. Following the amplify-and-forward
(AF) strategy, the problem consists of finding the transmit and receive beamformers
of the nodes and the relay, and the power allocated to each one, that achieve
the boundary of the capacity region. We express the optimal node beamformers in
terms of the relay beamformers, and show that the capacity region can be efficiently
characterized using convex optimization techniques. Numerical examples are provided
to illustrate the results of this paper, and to compare the capacity region achieved
by analog beamforming against the conventional MIMO schemes that operate at the
baseband.
author:
- first_name: Christian
full_name: Lameiro, Christian
last_name: Lameiro
- first_name: Alfredo
full_name: Nazábal, Alfredo
last_name: Nazábal
- first_name: Fouad
full_name: Gholam, Fouad
last_name: Gholam
- first_name: Javier
full_name: Vía, Javier
last_name: Vía
- first_name: Ignacio
full_name: Santamaría, Ignacio
last_name: Santamaría
citation:
ama: 'Lameiro C, Nazábal A, Gholam F, Vía J, Santamaría I. Capacity Region of the
Two-Way Multi-Antenna Relay Channel with Analog Tx-Rx Beamforming. In: Proc.
Int. ICST Conf. Mobile Lightweight Wireless Syst. ; 2011. doi:10.1007/978-3-642-29479-2_1'
apa: Lameiro, C., Nazábal, A., Gholam, F., Vía, J., & Santamaría, I. (2011).
Capacity Region of the Two-Way Multi-Antenna Relay Channel with Analog Tx-Rx Beamforming.
Proc. Int. ICST Conf. Mobile Lightweight Wireless Syst. https://doi.org/10.1007/978-3-642-29479-2_1
bibtex: '@inproceedings{Lameiro_Nazábal_Gholam_Vía_Santamaría_2011, place={Bilbao,
Spain}, title={Capacity Region of the Two-Way Multi-Antenna Relay Channel with
Analog Tx-Rx Beamforming}, DOI={10.1007/978-3-642-29479-2_1},
booktitle={Proc. Int. ICST Conf. Mobile Lightweight Wireless Syst.}, author={Lameiro,
Christian and Nazábal, Alfredo and Gholam, Fouad and Vía, Javier and Santamaría,
Ignacio}, year={2011} }'
chicago: Lameiro, Christian, Alfredo Nazábal, Fouad Gholam, Javier Vía, and Ignacio
Santamaría. “Capacity Region of the Two-Way Multi-Antenna Relay Channel with Analog
Tx-Rx Beamforming.” In Proc. Int. ICST Conf. Mobile Lightweight Wireless Syst.
Bilbao, Spain, 2011. https://doi.org/10.1007/978-3-642-29479-2_1.
ieee: 'C. Lameiro, A. Nazábal, F. Gholam, J. Vía, and I. Santamaría, “Capacity Region
of the Two-Way Multi-Antenna Relay Channel with Analog Tx-Rx Beamforming,” 2011,
doi: 10.1007/978-3-642-29479-2_1.'
mla: Lameiro, Christian, et al. “Capacity Region of the Two-Way Multi-Antenna Relay
Channel with Analog Tx-Rx Beamforming.” Proc. Int. ICST Conf. Mobile Lightweight
Wireless Syst., 2011, doi:10.1007/978-3-642-29479-2_1.
short: 'C. Lameiro, A. Nazábal, F. Gholam, J. Vía, I. Santamaría, in: Proc. Int.
ICST Conf. Mobile Lightweight Wireless Syst., Bilbao, Spain, 2011.'
date_created: 2023-01-30T11:51:59Z
date_updated: 2023-01-30T11:56:24Z
department:
- _id: '263'
doi: 10.1007/978-3-642-29479-2_1
place: Bilbao, Spain
publication: Proc. Int. ICST Conf. Mobile Lightweight Wireless Syst.
status: public
title: Capacity Region of the Two-Way Multi-Antenna Relay Channel with Analog Tx-Rx
Beamforming
type: conference
user_id: '43497'
year: '2011'
...
---
_id: '40828'
abstract:
- lang: eng
text: Spectrum sensing is a key component of the Cognitive Radio paradigm. Multiantenna
detectors can exploit different spatial features of primary signals in order to
boost detection performance and robustness in very low signal-to-noise ratios.
However, in several cases these detectors require additional information, such
as the rank of the spatial covariance matrix of the received signal. In this work
we study the problem of estimating this rank under Gaussianity assumption using
an uncalibrated receiver, i.e. with different (unknown) noise levels at each of
the antennas.
author:
- first_name: G.
full_name: Vazquez-Vilar, G.
last_name: Vazquez-Vilar
- first_name: D.
full_name: Ramírez, D.
last_name: Ramírez
- first_name: R.
full_name: López-Valcarce, R.
last_name: López-Valcarce
- first_name: J.
full_name: Vía, J.
last_name: Vía
- first_name: I.
full_name: Santamaría, I.
last_name: Santamaría
citation:
ama: 'Vazquez-Vilar G, Ramírez D, López-Valcarce R, Vía J, Santamaría I. Spatial
rank estimation in Cognitive Radio Networks with uncalibrated multiple antennas
(invited paper). In: Proc. Int. Conf. on Cognitive Radio and Advanced Spectrum
Management. ; 2011. doi:10.1145/2093256.2093291'
apa: Vazquez-Vilar, G., Ramírez, D., López-Valcarce, R., Vía, J., & Santamaría,
I. (2011). Spatial rank estimation in Cognitive Radio Networks with uncalibrated
multiple antennas (invited paper). Proc. Int. Conf. on Cognitive Radio and
Advanced Spectrum Management. https://doi.org/10.1145/2093256.2093291
bibtex: '@inproceedings{Vazquez-Vilar_Ramírez_López-Valcarce_Vía_Santamaría_2011,
place={Barcelona, Spain}, title={Spatial rank estimation in Cognitive Radio Networks
with uncalibrated multiple antennas (invited paper)}, DOI={10.1145/2093256.2093291},
booktitle={Proc. Int. Conf. on Cognitive Radio and Advanced Spectrum Management},
author={Vazquez-Vilar, G. and Ramírez, D. and López-Valcarce, R. and Vía, J. and
Santamaría, I.}, year={2011} }'
chicago: Vazquez-Vilar, G., D. Ramírez, R. López-Valcarce, J. Vía, and I. Santamaría.
“Spatial Rank Estimation in Cognitive Radio Networks with Uncalibrated Multiple
Antennas (Invited Paper).” In Proc. Int. Conf. on Cognitive Radio and Advanced
Spectrum Management. Barcelona, Spain, 2011. https://doi.org/10.1145/2093256.2093291.
ieee: 'G. Vazquez-Vilar, D. Ramírez, R. López-Valcarce, J. Vía, and I. Santamaría,
“Spatial rank estimation in Cognitive Radio Networks with uncalibrated multiple
antennas (invited paper),” 2011, doi: 10.1145/2093256.2093291.'
mla: Vazquez-Vilar, G., et al. “Spatial Rank Estimation in Cognitive Radio Networks
with Uncalibrated Multiple Antennas (Invited Paper).” Proc. Int. Conf. on Cognitive
Radio and Advanced Spectrum Management, 2011, doi:10.1145/2093256.2093291.
short: 'G. Vazquez-Vilar, D. Ramírez, R. López-Valcarce, J. Vía, I. Santamaría,
in: Proc. Int. Conf. on Cognitive Radio and Advanced Spectrum Management, Barcelona,
Spain, 2011.'
date_created: 2023-01-30T11:51:58Z
date_updated: 2023-01-30T11:56:20Z
department:
- _id: '263'
doi: 10.1145/2093256.2093291
place: Barcelona, Spain
publication: Proc. Int. Conf. on Cognitive Radio and Advanced Spectrum Management
status: public
title: Spatial rank estimation in Cognitive Radio Networks with uncalibrated multiple
antennas (invited paper)
type: conference
user_id: '43497'
year: '2011'
...
---
_id: '40837'
abstract:
- lang: eng
text: This paper considers linear precoding for time-varying multiple input multiple-output
(MIMO) channels. We show that linear minimum mean-squared error (LMMSE) equalization
based on the conjugate gradient (CG) method can result in significantly reduced
complexity compared with conventional approaches. This reduction is achieved by
incorporating a condition number constraint into the precoder optimization framework,
which leads to clustered eigen values of the measurement covariance matrix. The
cost is a small increase in MSE compared to the optimal precoder.
author:
- first_name: Jun
full_name: Tong, Jun
last_name: Tong
- first_name: Peter J.
full_name: Schreier, Peter J.
last_name: Schreier
- first_name: Steven R.
full_name: Weller, Steven R.
last_name: Weller
- first_name: Louis L.
full_name: Scharf, Louis L.
last_name: Scharf
citation:
ama: 'Tong J, Schreier PJ, Weller SR, Scharf LL. Linear precoding for time-varying
MIMO channels with low-complexity receivers. In: Proc.\ IEEE Int.\ Conf.\ Acoustics,
Speech and Signal Process. ; 2011:3092–3095. doi:10.1109/ICASSP.2011.5946312'
apa: Tong, J., Schreier, P. J., Weller, S. R., & Scharf, L. L. (2011). Linear
precoding for time-varying MIMO channels with low-complexity receivers. Proc.\
IEEE Int.\ Conf.\ Acoustics, Speech and Signal Process., 3092–3095. https://doi.org/10.1109/ICASSP.2011.5946312
bibtex: '@inproceedings{Tong_Schreier_Weller_Scharf_2011, title={Linear precoding
for time-varying MIMO channels with low-complexity receivers}, DOI={10.1109/ICASSP.2011.5946312},
booktitle={Proc.\ IEEE Int.\ Conf.\ Acoustics, Speech and Signal Process.}, author={Tong,
Jun and Schreier, Peter J. and Weller, Steven R. and Scharf, Louis L.}, year={2011},
pages={3092–3095} }'
chicago: Tong, Jun, Peter J. Schreier, Steven R. Weller, and Louis L. Scharf. “Linear
Precoding for Time-Varying MIMO Channels with Low-Complexity Receivers.” In Proc.\
IEEE Int.\ Conf.\ Acoustics, Speech and Signal Process., 3092–3095, 2011.
https://doi.org/10.1109/ICASSP.2011.5946312.
ieee: 'J. Tong, P. J. Schreier, S. R. Weller, and L. L. Scharf, “Linear precoding
for time-varying MIMO channels with low-complexity receivers,” in Proc.\ IEEE
Int.\ Conf.\ Acoustics, Speech and Signal Process., 2011, pp. 3092–3095, doi:
10.1109/ICASSP.2011.5946312.'
mla: Tong, Jun, et al. “Linear Precoding for Time-Varying MIMO Channels with Low-Complexity
Receivers.” Proc.\ IEEE Int.\ Conf.\ Acoustics, Speech and Signal Process.,
2011, pp. 3092–3095, doi:10.1109/ICASSP.2011.5946312.
short: 'J. Tong, P.J. Schreier, S.R. Weller, L.L. Scharf, in: Proc.\ IEEE Int.\
Conf.\ Acoustics, Speech and Signal Process., 2011, pp. 3092–3095.'
date_created: 2023-01-30T11:51:59Z
date_updated: 2023-01-30T11:56:22Z
department:
- _id: '263'
doi: 10.1109/ICASSP.2011.5946312
page: 3092–3095
publication: Proc.\ IEEE Int.\ Conf.\ Acoustics, Speech and Signal Process.
status: public
title: Linear precoding for time-varying MIMO channels with low-complexity receivers
type: conference
user_id: '43497'
year: '2011'
...
---
_id: '40830'
abstract:
- lang: eng
text: Interference Alignment (IA) has been revealed as one of the most attractive
transmission techniques for the K-user in- terference channel. In this work, we
employ a multiuser Multiple-Input Multiple-Output (MIMO) testbed to analyze, in
realistic indoor scenarios, the impact of channel state information errors on
the sum-rate performance of IA. We restrict our study to a 3-user interference
network in which each user transmits a single data stream using two transmit and
two receive antennas. For this MIMO interference network, only two different IA
solutions exist. We also evaluate the performance gain obtained in practice by
using the IA solution that maximizes the sum-rate.
author:
- first_name: J. A.
full_name: García-Naya, J. A.
last_name: García-Naya
- first_name: L.
full_name: Castedo, L.
last_name: Castedo
- first_name: D.
full_name: Ramírez, D.
last_name: Ramírez
- first_name: I.
full_name: Santamaría, I.
last_name: Santamaría
citation:
ama: 'García-Naya JA, Castedo L, Ramírez D, Santamaría I. Experimental Evaluation
of Interference Alignment Under Imperfect Channel State Information. In: Proc.\
Eur.\ Signal Process.\ Conf. ; 2011.'
apa: García-Naya, J. A., Castedo, L., Ramírez, D., & Santamaría, I. (2011).
Experimental Evaluation of Interference Alignment Under Imperfect Channel State
Information. Proc.\ Eur.\ Signal Process.\ Conf.
bibtex: '@inproceedings{García-Naya_Castedo_Ramírez_Santamaría_2011, place={Barcelona,
Spain}, title={Experimental Evaluation of Interference Alignment Under Imperfect
Channel State Information}, booktitle={Proc.\ Eur.\ Signal Process.\ Conf.}, author={García-Naya,
J. A. and Castedo, L. and Ramírez, D. and Santamaría, I.}, year={2011} }'
chicago: García-Naya, J. A., L. Castedo, D. Ramírez, and I. Santamaría. “Experimental
Evaluation of Interference Alignment Under Imperfect Channel State Information.”
In Proc.\ Eur.\ Signal Process.\ Conf. Barcelona, Spain, 2011.
ieee: J. A. García-Naya, L. Castedo, D. Ramírez, and I. Santamaría, “Experimental
Evaluation of Interference Alignment Under Imperfect Channel State Information,”
2011.
mla: García-Naya, J. A., et al. “Experimental Evaluation of Interference Alignment
Under Imperfect Channel State Information.” Proc.\ Eur.\ Signal Process.\ Conf.,
2011.
short: 'J.A. García-Naya, L. Castedo, D. Ramírez, I. Santamaría, in: Proc.\ Eur.\
Signal Process.\ Conf., Barcelona, Spain, 2011.'
date_created: 2023-01-30T11:51:58Z
date_updated: 2023-01-30T11:56:17Z
department:
- _id: '263'
place: Barcelona, Spain
publication: Proc.\ Eur.\ Signal Process.\ Conf.
status: public
title: Experimental Evaluation of Interference Alignment Under Imperfect Channel State
Information
type: conference
user_id: '43497'
year: '2011'
...
---
_id: '40832'
abstract:
- lang: eng
text: This paper studies the design and analysis of large multiple-input multiple-output
(MIMO) systems with linear precoding and Krylov subspace receivers. We design
precoders that can improve performance with low-rank receivers. We then introduce
a tool based on potential theory to analyze the convergence behavior of the mean-squared
error (MSE). The effectiveness of the proposed precoder and the superexponential
convergence of the MSE are demonstrated1.
author:
- first_name: Jun
full_name: Tong, Jun
last_name: Tong
- first_name: Peter J.
full_name: Schreier, Peter J.
last_name: Schreier
- first_name: Steven R.
full_name: Weller, Steven R.
last_name: Weller
citation:
ama: 'Tong J, Schreier PJ, Weller SR. Precoder design and convergence analysis of
MIMO systems with Krylov subspace receivers. In: Proc.\ IEEE Int.\ Symp.\ Inform.\
Theory. ; 2011:2914–2918. doi:10.1109/ISIT.2011.6034110'
apa: Tong, J., Schreier, P. J., & Weller, S. R. (2011). Precoder design and
convergence analysis of MIMO systems with Krylov subspace receivers. Proc.\
IEEE Int.\ Symp.\ Inform.\ Theory, 2914–2918. https://doi.org/10.1109/ISIT.2011.6034110
bibtex: '@inproceedings{Tong_Schreier_Weller_2011, title={Precoder design and convergence
analysis of MIMO systems with Krylov subspace receivers}, DOI={10.1109/ISIT.2011.6034110},
booktitle={Proc.\ IEEE Int.\ Symp.\ Inform.\ Theory}, author={Tong, Jun and Schreier,
Peter J. and Weller, Steven R.}, year={2011}, pages={2914–2918} }'
chicago: Tong, Jun, Peter J. Schreier, and Steven R. Weller. “Precoder Design and
Convergence Analysis of MIMO Systems with Krylov Subspace Receivers.” In Proc.\
IEEE Int.\ Symp.\ Inform.\ Theory, 2914–2918, 2011. https://doi.org/10.1109/ISIT.2011.6034110.
ieee: 'J. Tong, P. J. Schreier, and S. R. Weller, “Precoder design and convergence
analysis of MIMO systems with Krylov subspace receivers,” in Proc.\ IEEE Int.\
Symp.\ Inform.\ Theory, 2011, pp. 2914–2918, doi: 10.1109/ISIT.2011.6034110.'
mla: Tong, Jun, et al. “Precoder Design and Convergence Analysis of MIMO Systems
with Krylov Subspace Receivers.” Proc.\ IEEE Int.\ Symp.\ Inform.\ Theory,
2011, pp. 2914–2918, doi:10.1109/ISIT.2011.6034110.
short: 'J. Tong, P.J. Schreier, S.R. Weller, in: Proc.\ IEEE Int.\ Symp.\ Inform.\
Theory, 2011, pp. 2914–2918.'
date_created: 2023-01-30T11:51:59Z
date_updated: 2023-01-30T11:56:33Z
department:
- _id: '263'
doi: 10.1109/ISIT.2011.6034110
page: 2914–2918
publication: Proc.\ IEEE Int.\ Symp.\ Inform.\ Theory
status: public
title: Precoder design and convergence analysis of MIMO systems with Krylov subspace
receivers
type: conference
user_id: '43497'
year: '2011'
...
---
_id: '40831'
abstract:
- lang: eng
text: Spectrum sensing is a key component of the Cognitive Radio paradigm. Primary
signals are typically detected with uncalibrated receivers at signal-to-noise
ratios (SNRs) well below decodability levels. Multiantenna detectors exploit spatial
independence of receiver thermal noise to boost detection performance and robustness.
We study the problem of detecting a Gaussian signal with rank-$P$ unknown spatial
covariance matrix in spatially uncorrelated Gaussian noise with unknown covariance
using multiple antennas. The generalized likelihood ratio test (GLRT) is derived
for two scenarios. In the first one, the noises at all antennas are assumed to
have the same (unknown) variance, whereas in the second, a generic diagonal noise
covariance matrix is allowed in order to accommodate calibration uncertainties
in the different antenna frontends. In the latter case, the GLRT statistic must
be obtained numerically, for which an efficient method is presented. Furthermore,
for asymptotically low SNR, it is shown that the GLRT does admit a closed form,
and the resulting detector performs well in practice. Extensions are presented
in order to account for unknown temporal correlation in both signal and noise,
as well as frequency-selective channels.
author:
- first_name: D.
full_name: Ramírez, D.
last_name: Ramírez
- first_name: G.
full_name: Vazquez-Vilar, G.
last_name: Vazquez-Vilar
- first_name: R.
full_name: López-Valcarce, R.
last_name: López-Valcarce
- first_name: J.
full_name: Vía, J.
last_name: Vía
- first_name: I.
full_name: Santamaría, I.
last_name: Santamaría
citation:
ama: Ramírez D, Vazquez-Vilar G, López-Valcarce R, Vía J, Santamaría I. Detection
of rank-$P$ signals in Cognitive Radio Networks with uncalibrated multiple antennas.
{IEEE} {T}rans\ {S}ignal\ {P}rocess. 2011;59(8):3764–3774. doi:10.1109/TSP.2011.2146779
apa: Ramírez, D., Vazquez-Vilar, G., López-Valcarce, R., Vía, J., & Santamaría,
I. (2011). Detection of rank-$P$ signals in Cognitive Radio Networks with uncalibrated
multiple antennas. {IEEE} {T}rans.\ {S}ignal\ {P}rocess., 59(8),
3764–3774. https://doi.org/10.1109/TSP.2011.2146779
bibtex: '@article{Ramírez_Vazquez-Vilar_López-Valcarce_Vía_Santamaría_2011, title={Detection
of rank-$P$ signals in Cognitive Radio Networks with uncalibrated multiple antennas},
volume={59}, DOI={10.1109/TSP.2011.2146779},
number={8}, journal={{IEEE} {T}rans.\ {S}ignal\ {P}rocess.}, author={Ramírez,
D. and Vazquez-Vilar, G. and López-Valcarce, R. and Vía, J. and Santamaría, I.},
year={2011}, pages={3764–3774} }'
chicago: 'Ramírez, D., G. Vazquez-Vilar, R. López-Valcarce, J. Vía, and I. Santamaría.
“Detection of Rank-$P$ Signals in Cognitive Radio Networks with Uncalibrated Multiple
Antennas.” {IEEE} {T}rans.\ {S}ignal\ {P}rocess. 59, no. 8 (2011): 3764–3774.
https://doi.org/10.1109/TSP.2011.2146779.'
ieee: 'D. Ramírez, G. Vazquez-Vilar, R. López-Valcarce, J. Vía, and I. Santamaría,
“Detection of rank-$P$ signals in Cognitive Radio Networks with uncalibrated multiple
antennas,” {IEEE} {T}rans.\ {S}ignal\ {P}rocess., vol. 59, no. 8, pp. 3764–3774,
2011, doi: 10.1109/TSP.2011.2146779.'
mla: Ramírez, D., et al. “Detection of Rank-$P$ Signals in Cognitive Radio Networks
with Uncalibrated Multiple Antennas.” {IEEE} {T}rans.\ {S}ignal\ {P}rocess.,
vol. 59, no. 8, 2011, pp. 3764–3774, doi:10.1109/TSP.2011.2146779.
short: D. Ramírez, G. Vazquez-Vilar, R. López-Valcarce, J. Vía, I. Santamaría, {IEEE}
{T}rans.\ {S}ignal\ {P}rocess. 59 (2011) 3764–3774.
date_created: 2023-01-30T11:51:59Z
date_updated: 2023-01-30T11:56:35Z
department:
- _id: '263'
doi: 10.1109/TSP.2011.2146779
intvolume: ' 59'
issue: '8'
page: 3764–3774
publication: '{IEEE} {T}rans.\ {S}ignal\ {P}rocess.'
status: public
title: Detection of rank-$P$ signals in Cognitive Radio Networks with uncalibrated
multiple antennas
type: journal_article
user_id: '43497'
volume: 59
year: '2011'
...