---
_id: '40838'
abstract:
- lang: eng
text: A multiple-input multiple-output (MIMO) frequency-domain channel measurement
methodology is pre- sented. This methodology can be implemented in any transmit/receive
hardware consisting of radio frequency modules and baseband digital processing
units. It involves the transmission and reception of frequency and phase-optimized
complex exponentials through antenna arrays, followed by an offline frequency
estimation, which makes additional synchronization circuitry unnecesary. To test
the feasibility of this method, a series of measurements is presented, employing
a $4 \times 4$ dual-band (2.4/5 GHz) MIMO test bed.
author:
- first_name: J.
full_name: Gutiérrez, J.
last_name: Gutiérrez
- first_name: J.
full_name: Pérez, J.
last_name: Pérez
- first_name: D.
full_name: Ramírez, D.
last_name: Ramírez
- first_name: L.
full_name: Vielva, L.
last_name: Vielva
- first_name: J.
full_name: Ibáñez, J.
last_name: Ibáñez
- first_name: I.
full_name: Santamaría, I.
last_name: Santamaría
citation:
ama: Gutiérrez J, Pérez J, Ramírez D, Vielva L, Ibáñez J, Santamaría I. Frequency-Domain
Methodology for Measuring MIMO Channels Using a Generic Test Bed. IEEE Trans
Instrum Meas. 2011;60(3):827–838. doi:10.1109/TIM.2010.2082432
apa: Gutiérrez, J., Pérez, J., Ramírez, D., Vielva, L., Ibáñez, J., & Santamaría,
I. (2011). Frequency-Domain Methodology for Measuring MIMO Channels Using a Generic
Test Bed. IEEE Trans. Instrum. Meas., 60(3), 827–838. https://doi.org/10.1109/TIM.2010.2082432
bibtex: '@article{Gutiérrez_Pérez_Ramírez_Vielva_Ibáñez_Santamaría_2011, title={Frequency-Domain
Methodology for Measuring MIMO Channels Using a Generic Test Bed}, volume={60},
DOI={10.1109/TIM.2010.2082432},
number={3}, journal={IEEE Trans. Instrum. Meas.}, author={Gutiérrez, J. and Pérez,
J. and Ramírez, D. and Vielva, L. and Ibáñez, J. and Santamaría, I.}, year={2011},
pages={827–838} }'
chicago: 'Gutiérrez, J., J. Pérez, D. Ramírez, L. Vielva, J. Ibáñez, and I. Santamaría.
“Frequency-Domain Methodology for Measuring MIMO Channels Using a Generic Test
Bed.” IEEE Trans. Instrum. Meas. 60, no. 3 (2011): 827–838. https://doi.org/10.1109/TIM.2010.2082432.'
ieee: 'J. Gutiérrez, J. Pérez, D. Ramírez, L. Vielva, J. Ibáñez, and I. Santamaría,
“Frequency-Domain Methodology for Measuring MIMO Channels Using a Generic Test
Bed,” IEEE Trans. Instrum. Meas., vol. 60, no. 3, pp. 827–838, 2011, doi:
10.1109/TIM.2010.2082432.'
mla: Gutiérrez, J., et al. “Frequency-Domain Methodology for Measuring MIMO Channels
Using a Generic Test Bed.” IEEE Trans. Instrum. Meas., vol. 60, no. 3,
2011, pp. 827–838, doi:10.1109/TIM.2010.2082432.
short: J. Gutiérrez, J. Pérez, D. Ramírez, L. Vielva, J. Ibáñez, I. Santamaría,
IEEE Trans. Instrum. Meas. 60 (2011) 827–838.
date_created: 2023-01-30T11:52:00Z
date_updated: 2023-01-30T11:56:48Z
department:
- _id: '263'
doi: 10.1109/TIM.2010.2082432
intvolume: ' 60'
issue: '3'
page: 827–838
publication: IEEE Trans. Instrum. Meas.
status: public
title: Frequency-Domain Methodology for Measuring MIMO Channels Using a Generic Test
Bed
type: journal_article
user_id: '43497'
volume: 60
year: '2011'
...
---
_id: '40839'
abstract:
- lang: eng
text: Hardware platforms and testbeds are an essential tool to evaluate, in realistic
scenarios, the performance of wireless communications systems. In this work we
present a multiuser Multiple-Input Multiple-Output (MIMO) testbed made up of 6
nodes, each one with 4 antennas, which allows us to evaluate Interference Alignment
(IA) techniques in indoor scenarios. We specifically study the performance of
IA for the 3-user interference channel in the 5 GHz band. Our analysis identifies
the main practical issues that potentially degrade the IA performance such as
channel estimation errors or collinearity between the desired signal and interference
subspaces.
author:
- first_name: D.
full_name: Ramírez, D.
last_name: Ramírez
- first_name: I.
full_name: Santamaría, I.
last_name: Santamaría
- first_name: J. A.
full_name: García-Naya, J. A.
last_name: García-Naya
- first_name: L.
full_name: Castedo, L.
last_name: Castedo
citation:
ama: 'Ramírez D, Santamaría I, García-Naya JA, Castedo L. Experimental Validation
of Interference Alignment Techniques using a Multiuser MIMO Testbed. In: Proc.
Int. ITG Work. on Smart Antennas. ; 2011. doi:10.1109/WSA.2011.5741921'
apa: Ramírez, D., Santamaría, I., García-Naya, J. A., & Castedo, L. (2011).
Experimental Validation of Interference Alignment Techniques using a Multiuser
MIMO Testbed. Proc. Int. ITG Work. on Smart Antennas. https://doi.org/10.1109/WSA.2011.5741921
bibtex: '@inproceedings{Ramírez_Santamaría_García-Naya_Castedo_2011, place={Aachen,
Germany}, title={Experimental Validation of Interference Alignment Techniques
using a Multiuser MIMO Testbed}, DOI={10.1109/WSA.2011.5741921},
booktitle={Proc. Int. ITG Work. on Smart Antennas}, author={Ramírez, D. and Santamaría,
I. and García-Naya, J. A. and Castedo, L.}, year={2011} }'
chicago: Ramírez, D., I. Santamaría, J. A. García-Naya, and L. Castedo. “Experimental
Validation of Interference Alignment Techniques Using a Multiuser MIMO Testbed.”
In Proc. Int. ITG Work. on Smart Antennas. Aachen, Germany, 2011. https://doi.org/10.1109/WSA.2011.5741921.
ieee: 'D. Ramírez, I. Santamaría, J. A. García-Naya, and L. Castedo, “Experimental
Validation of Interference Alignment Techniques using a Multiuser MIMO Testbed,”
2011, doi: 10.1109/WSA.2011.5741921.'
mla: Ramírez, D., et al. “Experimental Validation of Interference Alignment Techniques
Using a Multiuser MIMO Testbed.” Proc. Int. ITG Work. on Smart Antennas,
2011, doi:10.1109/WSA.2011.5741921.
short: 'D. Ramírez, I. Santamaría, J.A. García-Naya, L. Castedo, in: Proc. Int.
ITG Work. on Smart Antennas, Aachen, Germany, 2011.'
date_created: 2023-01-30T11:52:00Z
date_updated: 2023-01-30T11:56:46Z
department:
- _id: '263'
doi: 10.1109/WSA.2011.5741921
place: Aachen, Germany
publication: Proc. Int. ITG Work. on Smart Antennas
status: public
title: Experimental Validation of Interference Alignment Techniques using a Multiuser
MIMO Testbed
type: conference
user_id: '43497'
year: '2011'
...
---
_id: '40826'
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. Locally stationary harmonizable complex improper stochastic
processes. J\ Time Ser\ Anal. 2011;32(1):33–46. doi:10.1111/j.1467-9892.2010.00682.x
apa: Wahlberg, P., & Schreier, P. J. (2011). Locally stationary harmonizable
complex improper stochastic processes. J.\ Time Ser.\ Anal., 32(1),
33–46. https://doi.org/10.1111/j.1467-9892.2010.00682.x
bibtex: '@article{Wahlberg_Schreier_2011, title={Locally stationary harmonizable
complex improper stochastic processes}, volume={32}, DOI={10.1111/j.1467-9892.2010.00682.x},
number={1}, journal={J.\ Time Ser.\ Anal.}, publisher={Blackwell Publishing Ltd},
author={Wahlberg, Patrik and Schreier, Peter J.}, year={2011}, pages={33–46} }'
chicago: 'Wahlberg, Patrik, and Peter J. Schreier. “Locally Stationary Harmonizable
Complex Improper Stochastic Processes.” J.\ Time Ser.\ Anal. 32, no. 1
(2011): 33–46. https://doi.org/10.1111/j.1467-9892.2010.00682.x.'
ieee: 'P. Wahlberg and P. J. Schreier, “Locally stationary harmonizable complex
improper stochastic processes,” J.\ Time Ser.\ Anal., vol. 32, no. 1, pp.
33–46, 2011, doi: 10.1111/j.1467-9892.2010.00682.x.'
mla: Wahlberg, Patrik, and Peter J. Schreier. “Locally Stationary Harmonizable Complex
Improper Stochastic Processes.” J.\ Time Ser.\ Anal., vol. 32, no. 1, Blackwell
Publishing Ltd, 2011, pp. 33–46, doi:10.1111/j.1467-9892.2010.00682.x.
short: P. Wahlberg, P.J. Schreier, J.\ Time Ser.\ Anal. 32 (2011) 33–46.
date_created: 2023-01-30T11:51:58Z
date_updated: 2023-01-30T11:57:47Z
department:
- _id: '263'
doi: 10.1111/j.1467-9892.2010.00682.x
intvolume: ' 32'
issue: '1'
page: 33–46
publication: J.\ Time Ser.\ Anal.
publisher: Blackwell Publishing Ltd
status: public
title: Locally stationary harmonizable complex improper stochastic processes
type: journal_article
user_id: '43497'
volume: 32
year: '2011'
...
---
_id: '40827'
author:
- first_name: Tülay
full_name: Adali, Tülay
last_name: Adali
- first_name: Peter J.
full_name: Schreier, Peter J.
last_name: Schreier
- first_name: Louis L.
full_name: Scharf, Louis L.
last_name: Scharf
citation:
ama: 'Adali T, Schreier PJ, Scharf LL. Complex-Valued Signal Processing: The Proper
Way to Deal With Impropriety. {IEEE} {T}rans\ {S}ignal\ {P}rocess. 2011;59(11):5101–5125.
doi:10.1109/TSP.2011.2162954'
apa: 'Adali, T., Schreier, P. J., & Scharf, L. L. (2011). Complex-Valued Signal
Processing: The Proper Way to Deal With Impropriety. {IEEE} {T}rans.\ {S}ignal\
{P}rocess., 59(11), 5101–5125. https://doi.org/10.1109/TSP.2011.2162954'
bibtex: '@article{Adali_Schreier_Scharf_2011, title={Complex-Valued Signal Processing:
The Proper Way to Deal With Impropriety}, volume={59}, DOI={10.1109/TSP.2011.2162954},
number={11}, journal={{IEEE} {T}rans.\ {S}ignal\ {P}rocess.}, author={Adali, Tülay
and Schreier, Peter J. and Scharf, Louis L.}, year={2011}, pages={5101–5125} }'
chicago: 'Adali, Tülay, Peter J. Schreier, and Louis L. Scharf. “Complex-Valued
Signal Processing: The Proper Way to Deal With Impropriety.” {IEEE} {T}rans.\
{S}ignal\ {P}rocess. 59, no. 11 (2011): 5101–5125. https://doi.org/10.1109/TSP.2011.2162954.'
ieee: 'T. Adali, P. J. Schreier, and L. L. Scharf, “Complex-Valued Signal Processing:
The Proper Way to Deal With Impropriety,” {IEEE} {T}rans.\ {S}ignal\ {P}rocess.,
vol. 59, no. 11, pp. 5101–5125, 2011, doi: 10.1109/TSP.2011.2162954.'
mla: 'Adali, Tülay, et al. “Complex-Valued Signal Processing: The Proper Way to
Deal With Impropriety.” {IEEE} {T}rans.\ {S}ignal\ {P}rocess., vol. 59,
no. 11, 2011, pp. 5101–5125, doi:10.1109/TSP.2011.2162954.'
short: T. Adali, P.J. Schreier, L.L. Scharf, {IEEE} {T}rans.\ {S}ignal\ {P}rocess.
59 (2011) 5101–5125.
date_created: 2023-01-30T11:51:58Z
date_updated: 2023-01-30T11:57:45Z
department:
- _id: '263'
doi: 10.1109/TSP.2011.2162954
intvolume: ' 59'
issue: '11'
page: 5101–5125
publication: '{IEEE} {T}rans.\ {S}ignal\ {P}rocess.'
status: public
title: 'Complex-Valued Signal Processing: The Proper Way to Deal With Impropriety'
type: journal_article
user_id: '43497'
volume: 59
year: '2011'
...
---
_id: '40825'
author:
- first_name: B. S.
full_name: Rüffer, B. S.
last_name: Rüffer
- first_name: Fabian R.
full_name: Wirth, Fabian R.
last_name: Wirth
citation:
ama: Rüffer BS, Wirth FR. Stability verification for monotone systems using homotopy
algorithms. Numer Algorithms. 2011;58(4):529–543. doi:10.1007/s11075-011-9468-3
apa: Rüffer, B. S., & Wirth, F. R. (2011). Stability verification for monotone
systems using homotopy algorithms. Numer. Algorithms, 58(4), 529–543.
https://doi.org/10.1007/s11075-011-9468-3
bibtex: '@article{Rüffer_Wirth_2011, title={Stability verification for monotone
systems using homotopy algorithms}, volume={58}, DOI={10.1007/s11075-011-9468-3},
number={4}, journal={Numer. Algorithms}, author={Rüffer, B. S. and Wirth, Fabian
R.}, year={2011}, pages={529–543} }'
chicago: 'Rüffer, B. S., and Fabian R. Wirth. “Stability Verification for Monotone
Systems Using Homotopy Algorithms.” Numer. Algorithms 58, no. 4 (2011):
529–543. https://doi.org/10.1007/s11075-011-9468-3.'
ieee: 'B. S. Rüffer and F. R. Wirth, “Stability verification for monotone systems
using homotopy algorithms,” Numer. Algorithms, vol. 58, no. 4, pp. 529–543,
2011, doi: 10.1007/s11075-011-9468-3.'
mla: Rüffer, B. S., and Fabian R. Wirth. “Stability Verification for Monotone Systems
Using Homotopy Algorithms.” Numer. Algorithms, vol. 58, no. 4, 2011, pp.
529–543, doi:10.1007/s11075-011-9468-3.
short: B.S. Rüffer, F.R. Wirth, Numer. Algorithms 58 (2011) 529–543.
date_created: 2023-01-30T11:51:58Z
date_updated: 2023-01-30T11:57:43Z
department:
- _id: '263'
doi: 10.1007/s11075-011-9468-3
intvolume: ' 58'
issue: '4'
page: 529–543
publication: Numer. Algorithms
status: public
title: Stability verification for monotone systems using homotopy algorithms
type: journal_article
user_id: '43497'
volume: 58
year: '2011'
...
---
_id: '40829'
author:
- first_name: G.
full_name: Vazquez-Vilar, G.
last_name: Vazquez-Vilar
- first_name: D.
full_name: Romero, D.
last_name: Romero
- first_name: R.
full_name: López-Valcarce, R.
last_name: López-Valcarce
- 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: J.
full_name: Sala, J.
last_name: Sala
citation:
ama: 'Vazquez-Vilar G, Romero D, López-Valcarce R, et al. Recent advances in multiantenna
spectrum sensing: complexity, noise uncertainty, and signal rank issues. In: Int.
Work. COST Action IC0902. ; 2011.'
apa: 'Vazquez-Vilar, G., Romero, D., López-Valcarce, R., Ramírez, D., Vía, J., Santamaría,
I., & Sala, J. (2011). Recent advances in multiantenna spectrum sensing: complexity,
noise uncertainty, and signal rank issues. Int. Work. COST Action IC0902.'
bibtex: '@inproceedings{Vazquez-Vilar_Romero_López-Valcarce_Ramírez_Vía_Santamaría_Sala_2011,
place={Barcelona, Spain}, title={Recent advances in multiantenna spectrum sensing:
complexity, noise uncertainty, and signal rank issues}, booktitle={Int. Work.
COST Action IC0902}, author={Vazquez-Vilar, G. and Romero, D. and López-Valcarce,
R. and Ramírez, D. and Vía, J. and Santamaría, I. and Sala, J.}, year={2011} }'
chicago: 'Vazquez-Vilar, G., D. Romero, R. López-Valcarce, D. Ramírez, J. Vía, I.
Santamaría, and J. Sala. “Recent Advances in Multiantenna Spectrum Sensing: Complexity,
Noise Uncertainty, and Signal Rank Issues.” In Int. Work. COST Action IC0902.
Barcelona, Spain, 2011.'
ieee: 'G. Vazquez-Vilar et al., “Recent advances in multiantenna spectrum
sensing: complexity, noise uncertainty, and signal rank issues,” 2011.'
mla: 'Vazquez-Vilar, G., et al. “Recent Advances in Multiantenna Spectrum Sensing:
Complexity, Noise Uncertainty, and Signal Rank Issues.” Int. Work. COST Action
IC0902, 2011.'
short: 'G. Vazquez-Vilar, D. Romero, R. López-Valcarce, D. Ramírez, J. Vía, I. Santamaría,
J. Sala, in: Int. Work. COST Action IC0902, Barcelona, Spain, 2011.'
date_created: 2023-01-30T11:51:58Z
date_updated: 2023-01-30T11:57:41Z
department:
- _id: '263'
place: Barcelona, Spain
publication: Int. Work. COST Action IC0902
status: public
title: 'Recent advances in multiantenna spectrum sensing: complexity, noise uncertainty,
and signal rank issues'
type: conference
user_id: '43497'
year: '2011'
...
---
_id: '40824'
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 Small-Gain Theorem and Construction
of Sum-Type Lyapunov Functions for Networks of iISS Systems. In: Proc. IEEE
American Contr. Conf. ; 2011:1971–1977.'
apa: Ito, H., Jiang, Z.-P., Dashkovskiy, S. N., & Rüffer, B. S. (2011). A Small-Gain
Theorem and Construction of Sum-Type Lyapunov Functions for Networks of iISS Systems.
Proc. IEEE American Contr. Conf., 1971–1977.
bibtex: '@inproceedings{Ito_Jiang_Dashkovskiy_Rüffer_2011, title={A Small-Gain Theorem
and Construction of Sum-Type Lyapunov Functions for Networks of iISS Systems},
booktitle={Proc. IEEE American Contr. Conf.}, author={Ito, Hiroshi and Jiang,
Zhong-Ping and Dashkovskiy, Sergey N. and Rüffer, Björn S.}, year={2011}, pages={1971–1977}
}'
chicago: Ito, Hiroshi, Zhong-Ping Jiang, Sergey N. Dashkovskiy, and Björn S. Rüffer.
“A Small-Gain Theorem and Construction of Sum-Type Lyapunov Functions for Networks
of IISS Systems.” In Proc. IEEE American Contr. Conf., 1971–1977, 2011.
ieee: H. Ito, Z.-P. Jiang, S. N. Dashkovskiy, and B. S. Rüffer, “A Small-Gain Theorem
and Construction of Sum-Type Lyapunov Functions for Networks of iISS Systems,”
in Proc. IEEE American Contr. Conf., 2011, pp. 1971–1977.
mla: Ito, Hiroshi, et al. “A Small-Gain Theorem and Construction of Sum-Type Lyapunov
Functions for Networks of IISS Systems.” Proc. IEEE American Contr. Conf.,
2011, pp. 1971–1977.
short: 'H. Ito, Z.-P. Jiang, S.N. Dashkovskiy, B.S. Rüffer, in: Proc. IEEE American
Contr. Conf., 2011, pp. 1971–1977.'
date_created: 2023-01-30T11:51:58Z
date_updated: 2023-01-30T11:57:38Z
department:
- _id: '263'
page: 1971–1977
publication: Proc. IEEE American Contr. Conf.
status: public
title: A Small-Gain Theorem and Construction of Sum-Type Lyapunov Functions for Networks
of iISS Systems
type: conference
user_id: '43497'
year: '2011'
...
---
_id: '40843'
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. For wide sense stationary (WSS) Gaussian processes, this is
a problem of deciding between two different power spectral density matrices, one
of them diagonal. Specifically, we show that for arbitrary Gaussian processes
(not necessarily WSS) the generalized likelihood ratio test (GLRT) is given by
the quotient between the determinant of the sample space-time covariance matrix
and the determinant of its block-diagonal version. Furthermore, for WSS processes,
we present an asymptotic frequency-domain approximation of the GLRT which is given
by a function of the Hadamard ratio (quotient between the determinant of a matrix
and the product of the elements of the main diagonal) of the estimated power spectral
density matrix. The Hadamard ratio is known to be the GLRT detector for vector-valued
random variables and, therefore, what this paper shows is how frequency-dependent
Hadamard ratios must be merged into a single test statistic when the vector-valued
random variable is replaced by a vector-valued time series with temporal correlation.
For bivariate time series, the derived frequency domain detector can be rewritten
as a function of the well-known magnitude squared coherence (MSC) spectrum, which
suggests a straightforward extension of the MSC spectrum to the general case of
multivariate time series. Finally, the performance of the proposed method is illustrated
by means of simulations.
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. Detection of Spatially Correlated
Gaussian Time Series. {IEEE} {T}rans\ {S}ignal\ {P}rocess. 2010;58(10):5006–5015.
doi:10.1109/TSP.2010.2053360
apa: Ramírez, D., Vía, J., Santamaría, I., & Scharf, L. L. (2010). Detection
of Spatially Correlated Gaussian Time Series. {IEEE} {T}rans.\ {S}ignal\ {P}rocess.,
58(10), 5006–5015. https://doi.org/10.1109/TSP.2010.2053360
bibtex: '@article{Ramírez_Vía_Santamaría_Scharf_2010, title={Detection of Spatially
Correlated Gaussian Time Series}, volume={58}, DOI={10.1109/TSP.2010.2053360},
number={10}, journal={{IEEE} {T}rans.\ {S}ignal\ {P}rocess.}, author={Ramírez,
D. and Vía, J. and Santamaría, I. and Scharf, L. L.}, year={2010}, pages={5006–5015}
}'
chicago: 'Ramírez, D., J. Vía, I. Santamaría, and L. L. Scharf. “Detection of Spatially
Correlated Gaussian Time Series.” {IEEE} {T}rans.\ {S}ignal\ {P}rocess.
58, no. 10 (2010): 5006–5015. https://doi.org/10.1109/TSP.2010.2053360.'
ieee: 'D. Ramírez, J. Vía, I. Santamaría, and L. L. Scharf, “Detection of Spatially
Correlated Gaussian Time Series,” {IEEE} {T}rans.\ {S}ignal\ {P}rocess.,
vol. 58, no. 10, pp. 5006–5015, 2010, doi: 10.1109/TSP.2010.2053360.'
mla: Ramírez, D., et al. “Detection of Spatially Correlated Gaussian Time Series.”
{IEEE} {T}rans.\ {S}ignal\ {P}rocess., vol. 58, no. 10, 2010, pp. 5006–5015,
doi:10.1109/TSP.2010.2053360.
short: D. Ramírez, J. Vía, I. Santamaría, L.L. Scharf, {IEEE} {T}rans.\ {S}ignal\
{P}rocess. 58 (2010) 5006–5015.
date_created: 2023-01-30T11:52:00Z
date_updated: 2023-01-30T11:56:44Z
department:
- _id: '263'
doi: 10.1109/TSP.2010.2053360
intvolume: ' 58'
issue: '10'
page: 5006–5015
publication: '{IEEE} {T}rans.\ {S}ignal\ {P}rocess.'
status: public
title: Detection of Spatially Correlated Gaussian Time Series
type: journal_article
user_id: '43497'
volume: 58
year: '2010'
...
---
_id: '40842'
abstract:
- lang: eng
text: One of the key problems in cognitive radio (CR) is the detection of primary
activity in order to determine which parts of the spectrum are available for opportunistic
access. In this work, we present a new multiantenna detector which fully exploits
the spatial and temporal structure of the signals. In particular, we derive the
generalized likelihood ratio test (GLRT) for the problem of detecting a wideband
rank-one signal under spatially uncorrelated noise with equal or different power
spectral densities. In order to simplify the maximum likelihood (ML) estimation
of the unknown parameters, we use the asymptotic likelihood in the frequency domain.
Interestingly, for noises with different distributions and under a low SNR approximation,
the GLRT is obtained as a function of the largest eigenvalue of the spectral coherence
matrix. Finally, the performance of the proposed detectors is evaluated by means
of numerical simulations, showing important advantages over previously proposed
approaches.
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
citation:
ama: 'Ramírez D, Vía J, Santamaría I. Multiantenna spectrum sensing: The case of
wideband rank-one primary signals. In: Proc.\ IEEE Sensor Array and Multichannel
Signal Process. Work. ; 2010. doi:10.1109/SAM.2010.5606502'
apa: 'Ramírez, D., Vía, J., & Santamaría, I. (2010). Multiantenna spectrum sensing:
The case of wideband rank-one primary signals. Proc.\ IEEE Sensor Array and
Multichannel Signal Process. Work. https://doi.org/10.1109/SAM.2010.5606502'
bibtex: '@inproceedings{Ramírez_Vía_Santamaría_2010, place={Israel}, title={Multiantenna
spectrum sensing: The case of wideband rank-one primary signals}, DOI={10.1109/SAM.2010.5606502},
booktitle={Proc.\ IEEE Sensor Array and Multichannel Signal Process. Work.}, author={Ramírez,
D. and Vía, J. and Santamaría, I.}, year={2010} }'
chicago: 'Ramírez, D., J. Vía, and I. Santamaría. “Multiantenna Spectrum Sensing:
The Case of Wideband Rank-One Primary Signals.” In Proc.\ IEEE Sensor Array
and Multichannel Signal Process. Work. Israel, 2010. https://doi.org/10.1109/SAM.2010.5606502.'
ieee: 'D. Ramírez, J. Vía, and I. Santamaría, “Multiantenna spectrum sensing: The
case of wideband rank-one primary signals,” 2010, doi: 10.1109/SAM.2010.5606502.'
mla: 'Ramírez, D., et al. “Multiantenna Spectrum Sensing: The Case of Wideband Rank-One
Primary Signals.” Proc.\ IEEE Sensor Array and Multichannel Signal Process.
Work., 2010, doi:10.1109/SAM.2010.5606502.'
short: 'D. Ramírez, J. Vía, I. Santamaría, in: Proc.\ IEEE Sensor Array and Multichannel
Signal Process. Work., Israel, 2010.'
date_created: 2023-01-30T11:52:00Z
date_updated: 2023-01-30T11:56:41Z
department:
- _id: '263'
doi: 10.1109/SAM.2010.5606502
place: Israel
publication: Proc.\ IEEE Sensor Array and Multichannel Signal Process. Work.
status: public
title: 'Multiantenna spectrum sensing: The case of wideband rank-one primary signals'
type: conference
user_id: '43497'
year: '2010'
...
---
_id: '40849'
abstract:
- lang: eng
text: In this paper the two main definitions of quaternion properness (or second
order circularity) are reviewed, showing their connection with the structure of
the optimal quaternion linear processing. Specifically, we present a rigorous
generalization of the most common multivariate statistical analysis techniques
to the case of quaternion vectors, and show that the different kinds of quaternion
improperness require different kinds of widely linear processing. In general,
the optimal linear processing is \emph{full-widely linear}, which requires the
joint processing of the quaternion vector and its involutions over three pure
unit quaternions. However, in the case of jointly $\mathbbQ$-proper and $\mathbbC^{\eta}$-proper
vectors, the optimal processing reduces, respectively, to the \emphconventional
and \emph{semi-widely linear processing}, with the latter only requiring to operate
on the quaternion vector and its involution over the pure unit quaternion $\eta$.
Finally, a simulation example poses some interesting questions for future research.
author:
- first_name: J.
full_name: Vía, J.
last_name: Vía
- first_name: D.
full_name: Ramírez, D.
last_name: Ramírez
- first_name: I.
full_name: Santamaría, I.
last_name: Santamaría
- first_name: L.
full_name: Vielva, L.
last_name: Vielva
citation:
ama: 'Vía J, Ramírez D, Santamaría I, Vielva L. Widely and semi-widely linear processing
of quaternion vectors. In: Proc.\ IEEE Int.\ Conf.\ Acoustics, Speech and Signal
Process. ; 2010. doi:10.1109/ICASSP.2010.5495787'
apa: Vía, J., Ramírez, D., Santamaría, I., & Vielva, L. (2010). Widely and semi-widely
linear processing of quaternion vectors. Proc.\ IEEE Int.\ Conf.\ Acoustics,
Speech and Signal Process. https://doi.org/10.1109/ICASSP.2010.5495787
bibtex: '@inproceedings{Vía_Ramírez_Santamaría_Vielva_2010, place={Dallas, USA},
title={Widely and semi-widely linear processing of quaternion vectors}, DOI={10.1109/ICASSP.2010.5495787},
booktitle={Proc.\ IEEE Int.\ Conf.\ Acoustics, Speech and Signal Process.}, author={Vía,
J. and Ramírez, D. and Santamaría, I. and Vielva, L.}, year={2010} }'
chicago: Vía, J., D. Ramírez, I. Santamaría, and L. Vielva. “Widely and Semi-Widely
Linear Processing of Quaternion Vectors.” In Proc.\ IEEE Int.\ Conf.\ Acoustics,
Speech and Signal Process. Dallas, USA, 2010. https://doi.org/10.1109/ICASSP.2010.5495787.
ieee: 'J. Vía, D. Ramírez, I. Santamaría, and L. Vielva, “Widely and semi-widely
linear processing of quaternion vectors,” 2010, doi: 10.1109/ICASSP.2010.5495787.'
mla: Vía, J., et al. “Widely and Semi-Widely Linear Processing of Quaternion Vectors.”
Proc.\ IEEE Int.\ Conf.\ Acoustics, Speech and Signal Process., 2010, doi:10.1109/ICASSP.2010.5495787.
short: 'J. Vía, D. Ramírez, I. Santamaría, L. Vielva, in: Proc.\ IEEE Int.\ Conf.\
Acoustics, Speech and Signal Process., Dallas, USA, 2010.'
date_created: 2023-01-30T11:52:01Z
date_updated: 2023-01-30T11:56:53Z
department:
- _id: '263'
doi: 10.1109/ICASSP.2010.5495787
place: Dallas, USA
publication: Proc.\ IEEE Int.\ Conf.\ Acoustics, Speech and Signal Process.
status: public
title: Widely and semi-widely linear processing of quaternion vectors
type: conference
user_id: '43497'
year: '2010'
...
---
_id: '40840'
abstract:
- lang: eng
text: Complex-valued random signals are embedded in the very fabric of science and
engineering, yet the usual assumptions made about their statistical behavior are
often a poor representation of the underlying physics. This book deals with improper
and noncircular complex signals, which do not conform to classical assumptions,
and it demonstrates how correct treatment of these signals can have significant
payoffs. The book begins with detailed coverage of the fundamental theory and
presents a variety of tools and algorithms for dealing with improper and noncircular
signals. It provides a comprehensive account of the main applications, covering
detection, estimation, and signal analysis of stationary, nonstationary, and cyclostationary
processes. Providing a systematic development from the origin of complex signals
to their probabilistic description makes the theory accessible to newcomers. This
book is ideal for graduate students and researchers working with complex data
in a range of research areas from communications to oceanography.
author:
- first_name: Peter J.
full_name: Schreier, Peter J.
last_name: Schreier
- first_name: Louis L.
full_name: Scharf, Louis L.
last_name: Scharf
citation:
ama: 'Schreier PJ, Scharf LL. Statistical Signal Processing of Complex-Valued
Data: The Theory of Improper and Noncircular Signals. Cambridge University
Press; 2010.'
apa: 'Schreier, P. J., & Scharf, L. L. (2010). Statistical Signal Processing
of Complex-Valued Data: The Theory of Improper and Noncircular Signals. Cambridge
University Press.'
bibtex: '@book{Schreier_Scharf_2010, title={Statistical Signal Processing of Complex-Valued
Data: The Theory of Improper and Noncircular Signals}, publisher={Cambridge University
Press}, author={Schreier, Peter J. and Scharf, Louis L.}, year={2010} }'
chicago: 'Schreier, Peter J., and Louis L. Scharf. Statistical Signal Processing
of Complex-Valued Data: The Theory of Improper and Noncircular Signals. Cambridge
University Press, 2010.'
ieee: 'P. J. Schreier and L. L. Scharf, Statistical Signal Processing of Complex-Valued
Data: The Theory of Improper and Noncircular Signals. Cambridge University
Press, 2010.'
mla: 'Schreier, Peter J., and Louis L. Scharf. Statistical Signal Processing
of Complex-Valued Data: The Theory of Improper and Noncircular Signals. Cambridge
University Press, 2010.'
short: 'P.J. Schreier, L.L. Scharf, Statistical Signal Processing of Complex-Valued
Data: The Theory of Improper and Noncircular Signals, Cambridge University Press,
2010.'
date_created: 2023-01-30T11:52:00Z
date_updated: 2023-01-30T11:56:39Z
department:
- _id: '263'
page: '330'
publisher: Cambridge University Press
status: public
title: 'Statistical Signal Processing of Complex-Valued Data: The Theory of Improper
and Noncircular Signals'
type: book
user_id: '43497'
year: '2010'
...
---
_id: '40841'
abstract:
- lang: eng
text: This paper presents a comprehensive analysis of superposition coded modulation
(SCM). Two types of SCM schemes, i.e., the single-code SCM (SC-SCM) and multi-code
SCM (MC-SCM), are analyzed. The basic features of SCM are described, followed
by the information-theoretic analysis. Different encoding/decoding strategies
are compared from the capacity point of view. A semi-analytical evolution technique
is proposed to track the convergence behavior of iterative decoding. Analytical
error-rate analysis is then conducted to predict the asymptotic performance. Numerous
examples demonstrate that the analysis tools discussed in this paper can provide
reasonably accurate performance prediction for SCM schemes.
author:
- first_name: Jun
full_name: Tong, Jun
last_name: Tong
- first_name: Li
full_name: Ping, Li
last_name: Ping
citation:
ama: Tong J, Ping L. Performance analysis of superposition coded modulation. Physical
Comm. 2010;3(3):147–155. doi:10.1016/j.phycom.2009.08.008
apa: Tong, J., & Ping, L. (2010). Performance analysis of superposition coded
modulation. Physical Comm., 3(3), 147–155. https://doi.org/10.1016/j.phycom.2009.08.008
bibtex: '@article{Tong_Ping_2010, title={Performance analysis of superposition coded
modulation}, volume={3}, DOI={10.1016/j.phycom.2009.08.008},
number={3}, journal={Physical Comm.}, author={Tong, Jun and Ping, Li}, year={2010},
pages={147–155} }'
chicago: 'Tong, Jun, and Li Ping. “Performance Analysis of Superposition Coded Modulation.”
Physical Comm. 3, no. 3 (2010): 147–155. https://doi.org/10.1016/j.phycom.2009.08.008.'
ieee: 'J. Tong and L. Ping, “Performance analysis of superposition coded modulation,”
Physical Comm., vol. 3, no. 3, pp. 147–155, 2010, doi: 10.1016/j.phycom.2009.08.008.'
mla: Tong, Jun, and Li Ping. “Performance Analysis of Superposition Coded Modulation.”
Physical Comm., vol. 3, no. 3, 2010, pp. 147–155, doi:10.1016/j.phycom.2009.08.008.
short: J. Tong, L. Ping, Physical Comm. 3 (2010) 147–155.
date_created: 2023-01-30T11:52:00Z
date_updated: 2023-01-30T11:56:37Z
department:
- _id: '263'
doi: 10.1016/j.phycom.2009.08.008
intvolume: ' 3'
issue: '3'
page: 147–155
publication: Physical Comm.
status: public
title: Performance analysis of superposition coded modulation
type: journal_article
user_id: '43497'
volume: 3
year: '2010'
...
---
_id: '40850'
abstract:
- lang: eng
text: We study linear minimum mean squared error filters for continuous-time second-order
stochastic processes that are locally stationary in Silverman’s sense. We show
that the optimal filter is rarely locally stationary even when the covariance
functions have Gaussian shape. Using Mehler’s formula we derive series expansions
of the filter kernel for locally stationary covariances that are determined by
Gaussians.
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 Wiener filtering of certain locally stationary
stochastic processes. Signal Process. 2010;90(3):885–890. doi:10.1016/j.sigpro.2009.09.013
apa: Wahlberg, P., & Schreier, P. J. (2010). On Wiener filtering of certain
locally stationary stochastic processes. Signal Process., 90(3),
885–890. https://doi.org/10.1016/j.sigpro.2009.09.013
bibtex: '@article{Wahlberg_Schreier_2010, title={On Wiener filtering of certain
locally stationary stochastic processes}, volume={90}, DOI={10.1016/j.sigpro.2009.09.013},
number={3}, journal={Signal Process.}, author={Wahlberg, Patrik and Schreier,
Peter J.}, year={2010}, pages={885–890} }'
chicago: 'Wahlberg, Patrik, and Peter J. Schreier. “On Wiener Filtering of Certain
Locally Stationary Stochastic Processes.” Signal Process. 90, no. 3 (2010):
885–890. https://doi.org/10.1016/j.sigpro.2009.09.013.'
ieee: 'P. Wahlberg and P. J. Schreier, “On Wiener filtering of certain locally stationary
stochastic processes,” Signal Process., vol. 90, no. 3, pp. 885–890, 2010,
doi: 10.1016/j.sigpro.2009.09.013.'
mla: Wahlberg, Patrik, and Peter J. Schreier. “On Wiener Filtering of Certain Locally
Stationary Stochastic Processes.” Signal Process., vol. 90, no. 3, 2010,
pp. 885–890, doi:10.1016/j.sigpro.2009.09.013.
short: P. Wahlberg, P.J. Schreier, Signal Process. 90 (2010) 885–890.
date_created: 2023-01-30T11:52:01Z
date_updated: 2023-01-30T11:56:50Z
department:
- _id: '263'
doi: 10.1016/j.sigpro.2009.09.013
intvolume: ' 90'
issue: '3'
page: 885–890
publication: Signal Process.
status: public
title: On Wiener filtering of certain locally stationary stochastic processes
type: journal_article
user_id: '43497'
volume: 90
year: '2010'
...
---
_id: '40848'
abstract:
- lang: eng
text: One of the key problems in cognitive radio (CR) is the detection of primary
activity in order to determine which parts of the spectrum are available for opportunistic
access. This detection task is challenging, since the wireless environment often
results in very low SNR conditions. Moreover, calibration errors and imperfect
analog components at the CR spectral monitor result in uncertainties in the noise
spectrum, making the problem more difficult. In this work, we present a new multiantenna
detector which is based on the fact that the observation noise processes are spatially
uncorrelated, whereas any primary signal present should result inspatial correlation.
In particular, we derive the generalized likelihood ratio test (GLRT) for this
problem, which is given by the quotient between the determinant of the sample
covariance matrix and the determinant of its block-diagonal version. For stationary
processes the GLRT tends asymptotically to the integral of the logarithm of the
Hadamard ratio of the estimated power spectral density matrix. Additionally, we
present an approximation of the frequency domain detector in the low SNR regime,
which results in computational savings. The performance of the proposed detectors
is evaluated by means of numerical simulations, showing important advantages over
existing detectors.
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: R.
full_name: López-Valcarce, R.
last_name: López-Valcarce
- first_name: L. L.
full_name: Scharf, L. L.
last_name: Scharf
citation:
ama: 'Ramírez D, Vía J, Santamaría I, López-Valcarce R, Scharf LL. Multiantenna
Spectrum Sensing: Detection of Spatial Correlation Among Time-Series With Unknown
Spectra. In: Proc.\ IEEE Int.\ Conf.\ Acoustics, Speech and Signal Process.
; 2010. doi:10.1109/ICASSP.2010.5496151'
apa: 'Ramírez, D., Vía, J., Santamaría, I., López-Valcarce, R., & Scharf, L.
L. (2010). Multiantenna Spectrum Sensing: Detection of Spatial Correlation Among
Time-Series With Unknown Spectra. Proc.\ IEEE Int.\ Conf.\ Acoustics, Speech
and Signal Process. https://doi.org/10.1109/ICASSP.2010.5496151'
bibtex: '@inproceedings{Ramírez_Vía_Santamaría_López-Valcarce_Scharf_2010, place={Dallas,
USA}, title={Multiantenna Spectrum Sensing: Detection of Spatial Correlation Among
Time-Series With Unknown Spectra}, DOI={10.1109/ICASSP.2010.5496151},
booktitle={Proc.\ IEEE Int.\ Conf.\ Acoustics, Speech and Signal Process.}, author={Ramírez,
D. and Vía, J. and Santamaría, I. and López-Valcarce, R. and Scharf, L. L.}, year={2010}
}'
chicago: 'Ramírez, D., J. Vía, I. Santamaría, R. López-Valcarce, and L. L. Scharf.
“Multiantenna Spectrum Sensing: Detection of Spatial Correlation Among Time-Series
With Unknown Spectra.” In Proc.\ IEEE Int.\ Conf.\ Acoustics, Speech and Signal
Process. Dallas, USA, 2010. https://doi.org/10.1109/ICASSP.2010.5496151.'
ieee: 'D. Ramírez, J. Vía, I. Santamaría, R. López-Valcarce, and L. L. Scharf, “Multiantenna
Spectrum Sensing: Detection of Spatial Correlation Among Time-Series With Unknown
Spectra,” 2010, doi: 10.1109/ICASSP.2010.5496151.'
mla: 'Ramírez, D., et al. “Multiantenna Spectrum Sensing: Detection of Spatial Correlation
Among Time-Series With Unknown Spectra.” Proc.\ IEEE Int.\ Conf.\ Acoustics,
Speech and Signal Process., 2010, doi:10.1109/ICASSP.2010.5496151.'
short: 'D. Ramírez, J. Vía, I. Santamaría, R. López-Valcarce, L.L. Scharf, in: Proc.\
IEEE Int.\ Conf.\ Acoustics, Speech and Signal Process., Dallas, USA, 2010.'
date_created: 2023-01-30T11:52:01Z
date_updated: 2023-01-30T11:55:28Z
department:
- _id: '263'
doi: 10.1109/ICASSP.2010.5496151
place: Dallas, USA
publication: Proc.\ IEEE Int.\ Conf.\ Acoustics, Speech and Signal Process.
status: public
title: 'Multiantenna Spectrum Sensing: Detection of Spatial Correlation Among Time-Series
With Unknown Spectra'
type: conference
user_id: '43497'
year: '2010'
...
---
_id: '40847'
abstract:
- lang: eng
text: In this paper, the second-order circularity of quater- nion random vectors
is analyzed. Unlike the case of complex vectors, there exist three different kinds
of quaternion properness, which are based on the vanishing of three different
complemen- tary covariance matrices. The different kinds of properness have direct
implications on the Cayley–Dickson representation of the quaternion vector, and
also on several well-known multivariate statistical analysis methods. In particular,
the quaternion exten- sions of the partial least squares (PLS), multiple linear
regression (MLR) and canonical correlation analysis (CCA) techniques are analyzed,
showing that, in general, the optimal linear processing is \emph{full-widely linear}.
However, in the case of jointly $\mathbbQ$-proper or $\mathbbC^{\eta}$-proper
vectors, the optimal processing reduces, respectively, to the \emphconventional
or \emph{semi-widely linear} processing. Finally, a measure for the degree of
improperness of a quaternion random vector is proposed, which is based on the
Kullback–Leibler diver- gence between two zero-mean Gaussian distributions, one
of them with the actual augmented covariance matrix, and the other with its closest
proper version. This measure quantifies the entropy loss due to the improperness
of the quaternion vector, and it admits an intuitive geometrical interpretation
based on Kullback–Leibler projections onto sets of proper augmented covariance
matrices.
author:
- first_name: J.
full_name: Vía, J.
last_name: Vía
- first_name: D.
full_name: Ramírez, D.
last_name: Ramírez
- first_name: I.
full_name: Santamaría, I.
last_name: Santamaría
citation:
ama: Vía J, Ramírez D, Santamaría I. Properness and Widely Linear Processing of
Quaternion Random Vectors. IEEE Trans\ Inform\ Theory. 2010;56(7):3502–3515.
doi:10.1109/TIT.2010.2048440
apa: Vía, J., Ramírez, D., & Santamaría, I. (2010). Properness and Widely Linear
Processing of Quaternion Random Vectors. IEEE Trans.\ Inform.\ Theory,
56(7), 3502–3515. https://doi.org/10.1109/TIT.2010.2048440
bibtex: '@article{Vía_Ramírez_Santamaría_2010, title={Properness and Widely Linear
Processing of Quaternion Random Vectors}, volume={56}, DOI={10.1109/TIT.2010.2048440},
number={7}, journal={IEEE Trans.\ Inform.\ Theory}, author={Vía, J. and Ramírez,
D. and Santamaría, I.}, year={2010}, pages={3502–3515} }'
chicago: 'Vía, J., D. Ramírez, and I. Santamaría. “Properness and Widely Linear
Processing of Quaternion Random Vectors.” IEEE Trans.\ Inform.\ Theory
56, no. 7 (2010): 3502–3515. https://doi.org/10.1109/TIT.2010.2048440.'
ieee: 'J. Vía, D. Ramírez, and I. Santamaría, “Properness and Widely Linear Processing
of Quaternion Random Vectors,” IEEE Trans.\ Inform.\ Theory, vol. 56, no.
7, pp. 3502–3515, 2010, doi: 10.1109/TIT.2010.2048440.'
mla: Vía, J., et al. “Properness and Widely Linear Processing of Quaternion Random
Vectors.” IEEE Trans.\ Inform.\ Theory, vol. 56, no. 7, 2010, pp. 3502–3515,
doi:10.1109/TIT.2010.2048440.
short: J. Vía, D. Ramírez, I. Santamaría, IEEE Trans.\ Inform.\ Theory 56 (2010)
3502–3515.
date_created: 2023-01-30T11:52:01Z
date_updated: 2023-01-30T11:55:25Z
department:
- _id: '263'
doi: 10.1109/TIT.2010.2048440
intvolume: ' 56'
issue: '7'
page: 3502–3515
publication: IEEE Trans.\ Inform.\ Theory
status: public
title: Properness and Widely Linear Processing of Quaternion Random Vectors
type: journal_article
user_id: '43497'
volume: 56
year: '2010'
...
---
_id: '40844'
abstract:
- lang: eng
text: This paper deals with the clipping method used in orthogonal frequency-division
multiplexing (OFDM) systems to reduce the peak-to-average power ratio (PAPR).
An iterative soft compensation method is proposed to mitigate the clipping distortion,
which can outperform conventional treatments. The impact of signaling schemes
on the residual clipping noise power is studied via the symbol variance analysis.
It is found that superposition coded modulation (SCM) can minimize the residual
clipping noise power among all possible signaling schemes. This indicates that
SCM-based OFDM systems are more robust to clipping effect than other alternatives
when soft compensation is applied. It is also shown that a multi-code SCM scheme
can further reduce the clipping effect and its overall performance can be quickly
evaluated using a semi-analytical evolution method. Numerical examples are provided
to verify the analysis.
author:
- first_name: Jun
full_name: Tong, Jun
last_name: Tong
- first_name: Li
full_name: Ping, Li
last_name: Ping
- first_name: Zhonghao
full_name: Zhang, Zhonghao
last_name: Zhang
- first_name: Vijay K.
full_name: Bhargava, Vijay K.
last_name: Bhargava
citation:
ama: Tong J, Ping L, Zhang Z, Bhargava VK. Iterative soft compensation for OFDM
systems with clipping and superposition coded modulation. IEEE Trans\ Comm.
2010;58(10):2861–2870. doi:10.1109/TCOMM.2010.083110.09296
apa: Tong, J., Ping, L., Zhang, Z., & Bhargava, V. K. (2010). Iterative soft
compensation for OFDM systems with clipping and superposition coded modulation.
IEEE Trans.\ Comm., 58(10), 2861–2870. https://doi.org/10.1109/TCOMM.2010.083110.09296
bibtex: '@article{Tong_Ping_Zhang_Bhargava_2010, title={Iterative soft compensation
for OFDM systems with clipping and superposition coded modulation}, volume={58},
DOI={10.1109/TCOMM.2010.083110.09296},
number={10}, journal={IEEE Trans.\ Comm.}, author={Tong, Jun and Ping, Li and
Zhang, Zhonghao and Bhargava, Vijay K.}, year={2010}, pages={2861–2870} }'
chicago: 'Tong, Jun, Li Ping, Zhonghao Zhang, and Vijay K. Bhargava. “Iterative
Soft Compensation for OFDM Systems with Clipping and Superposition Coded Modulation.”
IEEE Trans.\ Comm. 58, no. 10 (2010): 2861–2870. https://doi.org/10.1109/TCOMM.2010.083110.09296.'
ieee: 'J. Tong, L. Ping, Z. Zhang, and V. K. Bhargava, “Iterative soft compensation
for OFDM systems with clipping and superposition coded modulation,” IEEE Trans.\
Comm., vol. 58, no. 10, pp. 2861–2870, 2010, doi: 10.1109/TCOMM.2010.083110.09296.'
mla: Tong, Jun, et al. “Iterative Soft Compensation for OFDM Systems with Clipping
and Superposition Coded Modulation.” IEEE Trans.\ Comm., vol. 58, no. 10,
2010, pp. 2861–2870, doi:10.1109/TCOMM.2010.083110.09296.
short: J. Tong, L. Ping, Z. Zhang, V.K. Bhargava, IEEE Trans.\ Comm. 58 (2010) 2861–2870.
date_created: 2023-01-30T11:52:01Z
date_updated: 2023-01-30T11:57:00Z
department:
- _id: '263'
doi: 10.1109/TCOMM.2010.083110.09296
intvolume: ' 58'
issue: '10'
page: 2861–2870
publication: IEEE Trans.\ Comm.
status: public
title: Iterative soft compensation for OFDM systems with clipping and superposition
coded modulation
type: journal_article
user_id: '43497'
volume: 58
year: '2010'
...
---
_id: '40845'
abstract:
- lang: eng
text: It has been recently proved that the two main kinds of quaternion improperness
require two different kinds of widely linear process- ing. In this work, we show
that these definitions satisfy some im- portant properties, which include the
invariance to quaternion lin- ear transformations and right Clifford translations,
as well as some clear connections with the case of proper complex vectors. More-
over, we introduce a new kind of quaternion properness, which clearly relates
the two previous definitions, and propose three mea- sures for the degree of improperness
of a quaternion vector. The proposed measures are based on the Kullback-Leibler
divergence between two zero-mean quaternion Gaussian distributions, one of them
with the actual augmented covariance matrix, and the other with its closest proper
version. These measures allow us to quan- tify the entropy loss due to the improperness
of the quaternion vec- tor, and they admit an intuitive geometrical interpretation
based on Kullback-Leibler projections onto sets of proper augmented co- variance
matrices.
author:
- first_name: J.
full_name: Vía, J.
last_name: Vía
- first_name: D.
full_name: Ramírez, D.
last_name: Ramírez
- first_name: I.
full_name: Santamaría, I.
last_name: Santamaría
- first_name: L.
full_name: Vielva, L.
last_name: Vielva
citation:
ama: 'Vía J, Ramírez D, Santamaría I, Vielva L. Improperness Measures for Quaternion
Random Vectors. In: Proc.\ IEEE Int.\ Work. Machine Learning for Signal Process.
; 2010. doi:10.1109/MLSP.2010.5589225'
apa: Vía, J., Ramírez, D., Santamaría, I., & Vielva, L. (2010). Improperness
Measures for Quaternion Random Vectors. Proc.\ IEEE Int.\ Work. Machine Learning
for Signal Process. https://doi.org/10.1109/MLSP.2010.5589225
bibtex: '@inproceedings{Vía_Ramírez_Santamaría_Vielva_2010, place={Finland}, title={Improperness
Measures for Quaternion Random Vectors}, DOI={10.1109/MLSP.2010.5589225},
booktitle={Proc.\ IEEE Int.\ Work. Machine Learning for Signal Process.}, author={Vía,
J. and Ramírez, D. and Santamaría, I. and Vielva, L.}, year={2010} }'
chicago: Vía, J., D. Ramírez, I. Santamaría, and L. Vielva. “Improperness Measures
for Quaternion Random Vectors.” In Proc.\ IEEE Int.\ Work. Machine Learning
for Signal Process. Finland, 2010. https://doi.org/10.1109/MLSP.2010.5589225.
ieee: 'J. Vía, D. Ramírez, I. Santamaría, and L. Vielva, “Improperness Measures
for Quaternion Random Vectors,” 2010, doi: 10.1109/MLSP.2010.5589225.'
mla: Vía, J., et al. “Improperness Measures for Quaternion Random Vectors.” Proc.\
IEEE Int.\ Work. Machine Learning for Signal Process., 2010, doi:10.1109/MLSP.2010.5589225.
short: 'J. Vía, D. Ramírez, I. Santamaría, L. Vielva, in: Proc.\ IEEE Int.\ Work.
Machine Learning for Signal Process., Finland, 2010.'
date_created: 2023-01-30T11:52:01Z
date_updated: 2023-01-30T11:56:58Z
department:
- _id: '263'
doi: 10.1109/MLSP.2010.5589225
place: Finland
publication: Proc.\ IEEE Int.\ Work. Machine Learning for Signal Process.
status: public
title: Improperness Measures for Quaternion Random Vectors
type: conference
user_id: '43497'
year: '2010'
...
---
_id: '40846'
abstract:
- lang: eng
text: In this paper we characterize the capacity boundary of the two-user multiple-input
multiple-output (MIMO) broadcast channel (BC) when the multiantenna terminals
use analog beamforming at both sides of the link. Basically, the problem reduces
to finding the optimal transmit direction and the optimal power allocation between
users to operate at any point on the boundary. We show that both optimization
problems can be solved in closed form. First, exploiting the fact that any Pareto
optimal pair of rates must also be Pareto optimal of a convex region defined by
the channel energies, the optimal transmit direction is shown to be the principal
eigenvector of a matrix. Second, the optimal power allocation is obtained by exploiting
again the Pareto optimality of the sought pair of rates. Although this paper focuses
on the BC, the obtained results also serve to characterize the dual multiple-access
channel (MAC). Moreover, this explicit characterization of the boundary can be
extended to a $K$-user system for $K>2$. Numerical examples are provided to illustrate
the results of the paper, and to show the enlargement of the capacity region achieved
by analog beamforming in comparison to a single-input single-output (SISO) BC.
author:
- first_name: Ignacio
full_name: Santamaría, Ignacio
last_name: Santamaría
- first_name: Javier
full_name: Vía, Javier
last_name: Vía
- first_name: Alfredo
full_name: Nazábal, Alfredo
last_name: Nazábal
- first_name: Christian
full_name: Lameiro, Christian
last_name: Lameiro
citation:
ama: 'Santamaría I, Vía J, Nazábal A, Lameiro C. Capacity region of the multiantenna
Gaussian broadcast channel with analog TX-RX beamforming. In: Proc. Int. ICST
Conf. Comm. and Networking in China. ; 2010.'
apa: Santamaría, I., Vía, J., Nazábal, A., & Lameiro, C. (2010). Capacity region
of the multiantenna Gaussian broadcast channel with analog TX-RX beamforming.
Proc. Int. ICST Conf. Comm. and Networking in China.
bibtex: '@inproceedings{Santamaría_Vía_Nazábal_Lameiro_2010, place={Beijing, China},
title={Capacity region of the multiantenna Gaussian broadcast channel with analog
TX-RX beamforming}, booktitle={Proc. Int. ICST Conf. Comm. and Networking in China},
author={Santamaría, Ignacio and Vía, Javier and Nazábal, Alfredo and Lameiro,
Christian}, year={2010} }'
chicago: Santamaría, Ignacio, Javier Vía, Alfredo Nazábal, and Christian Lameiro.
“Capacity Region of the Multiantenna Gaussian Broadcast Channel with Analog TX-RX
Beamforming.” In Proc. Int. ICST Conf. Comm. and Networking in China. Beijing,
China, 2010.
ieee: I. Santamaría, J. Vía, A. Nazábal, and C. Lameiro, “Capacity region of the
multiantenna Gaussian broadcast channel with analog TX-RX beamforming,” 2010.
mla: Santamaría, Ignacio, et al. “Capacity Region of the Multiantenna Gaussian Broadcast
Channel with Analog TX-RX Beamforming.” Proc. Int. ICST Conf. Comm. and Networking
in China, 2010.
short: 'I. Santamaría, J. Vía, A. Nazábal, C. Lameiro, in: Proc. Int. ICST Conf.
Comm. and Networking in China, Beijing, China, 2010.'
date_created: 2023-01-30T11:52:01Z
date_updated: 2023-01-30T11:56:55Z
department:
- _id: '263'
place: Beijing, China
publication: Proc. Int. ICST Conf. Comm. and Networking in China
status: public
title: Capacity region of the multiantenna Gaussian broadcast channel with analog
TX-RX beamforming
type: conference
user_id: '43497'
year: '2010'
...
---
_id: '40857'
abstract:
- lang: eng
text: We provide a review of independent component analysis (ICA) for complex-valued
improper and noncircular random sources. An improper random signal is correlated
with its complex conjugate, and a noncircular random signal has a rotationally
variant probability distribution. We present methods for ICA using second-order
statistics, and higher-order statistics. For ICA based on second-order statistics,
we emphasize the key role played by the circularity coefficients, which are the
canonical correlations between the source and the complex conjugate. For ICA based
on higher-order statistics, we show how to extend algorithms for real-valued ICA
to the complex domain using Wirtinger calculus.
author:
- first_name: Peter J.
full_name: Schreier, Peter J.
last_name: Schreier
- first_name: Tülay
full_name: Adali, Tülay
last_name: Adali
- first_name: Louis L.
full_name: Scharf, Louis L.
last_name: Scharf
citation:
ama: 'Schreier PJ, Adali T, Scharf LL. On ICA of improper and noncircular sources.
In: Proc.\ IEEE Int.\ Conf.\ Acoustics, Speech and Signal Process. ; 2009:3561–3564.
doi:10.1109/ICASSP.2009.4960395'
apa: Schreier, P. J., Adali, T., & Scharf, L. L. (2009). On ICA of improper
and noncircular sources. Proc.\ IEEE Int.\ Conf.\ Acoustics, Speech and Signal
Process., 3561–3564. https://doi.org/10.1109/ICASSP.2009.4960395
bibtex: '@inproceedings{Schreier_Adali_Scharf_2009, title={On ICA of improper and
noncircular sources}, DOI={10.1109/ICASSP.2009.4960395},
booktitle={Proc.\ IEEE Int.\ Conf.\ Acoustics, Speech and Signal Process.}, author={Schreier,
Peter J. and Adali, Tülay and Scharf, Louis L.}, year={2009}, pages={3561–3564}
}'
chicago: Schreier, Peter J., Tülay Adali, and Louis L. Scharf. “On ICA of Improper
and Noncircular Sources.” In Proc.\ IEEE Int.\ Conf.\ Acoustics, Speech and
Signal Process., 3561–3564, 2009. https://doi.org/10.1109/ICASSP.2009.4960395.
ieee: 'P. J. Schreier, T. Adali, and L. L. Scharf, “On ICA of improper and noncircular
sources,” in Proc.\ IEEE Int.\ Conf.\ Acoustics, Speech and Signal Process.,
2009, pp. 3561–3564, doi: 10.1109/ICASSP.2009.4960395.'
mla: Schreier, Peter J., et al. “On ICA of Improper and Noncircular Sources.” Proc.\
IEEE Int.\ Conf.\ Acoustics, Speech and Signal Process., 2009, pp. 3561–3564,
doi:10.1109/ICASSP.2009.4960395.
short: 'P.J. Schreier, T. Adali, L.L. Scharf, in: Proc.\ IEEE Int.\ Conf.\ Acoustics,
Speech and Signal Process., 2009, pp. 3561–3564.'
date_created: 2023-01-30T11:52:02Z
date_updated: 2023-01-30T11:55:45Z
department:
- _id: '263'
doi: 10.1109/ICASSP.2009.4960395
page: 3561–3564
publication: Proc.\ IEEE Int.\ Conf.\ Acoustics, Speech and Signal Process.
status: public
title: On ICA of improper and noncircular sources
type: conference
user_id: '43497'
year: '2009'
...
---
_id: '40851'
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. Gabor discretization of the Weyl product for modulation
spaces and filtering of nonstationary stochastic processes. Appl\ Comput\ Harmon\
Anal. 2009;26(1):97–120. doi:10.1016/j.acha.2008.02.005
apa: Wahlberg, P., & Schreier, P. J. (2009). Gabor discretization of the Weyl
product for modulation spaces and filtering of nonstationary stochastic processes.
Appl.\ Comput.\ Harmon.\ Anal., 26(1), 97–120. https://doi.org/10.1016/j.acha.2008.02.005
bibtex: '@article{Wahlberg_Schreier_2009, title={Gabor discretization of the Weyl
product for modulation spaces and filtering of nonstationary stochastic processes},
volume={26}, DOI={10.1016/j.acha.2008.02.005},
number={1}, journal={Appl.\ Comput.\ Harmon.\ Anal.}, author={Wahlberg, Patrik
and Schreier, Peter J.}, year={2009}, pages={97–120} }'
chicago: 'Wahlberg, Patrik, and Peter J. Schreier. “Gabor Discretization of the
Weyl Product for Modulation Spaces and Filtering of Nonstationary Stochastic Processes.”
Appl.\ Comput.\ Harmon.\ Anal. 26, no. 1 (2009): 97–120. https://doi.org/10.1016/j.acha.2008.02.005.'
ieee: 'P. Wahlberg and P. J. Schreier, “Gabor discretization of the Weyl product
for modulation spaces and filtering of nonstationary stochastic processes,” Appl.\
Comput.\ Harmon.\ Anal., vol. 26, no. 1, pp. 97–120, 2009, doi: 10.1016/j.acha.2008.02.005.'
mla: Wahlberg, Patrik, and Peter J. Schreier. “Gabor Discretization of the Weyl
Product for Modulation Spaces and Filtering of Nonstationary Stochastic Processes.”
Appl.\ Comput.\ Harmon.\ Anal., vol. 26, no. 1, 2009, pp. 97–120, doi:10.1016/j.acha.2008.02.005.
short: P. Wahlberg, P.J. Schreier, Appl.\ Comput.\ Harmon.\ Anal. 26 (2009) 97–120.
date_created: 2023-01-30T11:52:02Z
date_updated: 2023-01-30T11:55:43Z
department:
- _id: '263'
doi: 10.1016/j.acha.2008.02.005
intvolume: ' 26'
issue: '1'
page: 97–120
publication: Appl.\ Comput.\ Harmon.\ Anal.
status: public
title: Gabor discretization of the Weyl product for modulation spaces and filtering
of nonstationary stochastic processes
type: journal_article
user_id: '43497'
volume: 26
year: '2009'
...