
Athanasios P. Liavas
Professor
Telecommunications Division School of Electrical & Computer Engineering
Technical University of Crete Kounoupidiana Campus Chania  Crete, Greece 731 00
Email: liavastelecom.tuc.gr
Phone: +302821037224

Short CV
Athanasios
Liavas received his Diploma and PhD from the University of Patras, in 1989 and 1993, respectively. From 1993 to 1995 he served in the Greek Army.
He spent the years 1996 to 1998 at the Institut National des Télécommunications, Evry, France, as a Marie Curie postdoctoral Fellow. From 1999 to 2001,
he was a visiting Assistant Professor at the Department of Informatics, University of Ioannina. In 2001, he became an Assistant Professor at the Department
of Mathematics, University of the Aegean. In 2004, he joined the Department of Electronic and Computer Engineering (since 2016, renamed to School of Electrical
and Computer Engineering  ECE), Technical University of Crete, as Associate Professor. In September 2009, he became Professor. He served as Department Chair
from September 2009 to August 2011, as Vice Chair from
September 2011 to August 2013, and as Dean of the ECE School from December 2017 to August 2021.
Dr. Liavas served as an Associate Editor for the IEEE Transactions on Signal Processing
from 2005 to 2009. He was an elected member of the IEEE SP COM Technical Committee
from 2006 to 2011.
Publications
Journal paper re/preprints:
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Publications in Journals
 P. Karakasis, A. P. Liavas, N. D. Sidiropoulos, P. Simos, and E. Papadaki "Multisubject taskrelated fMRI data processing via a twostage generalized canonical correlation analysis," IEEE Transactions on Image Processing, accepted for publication (Febr. 2022).
 A. BalatsoukasStimming and A. P. Liavas, "Design of LDPC Codes for the Unequal Power TwoUser Gaussian Multiple Access Channel," IEEE Wireless Communications Letters, vol. 7, no. 5, pp. 868871, October 2018.
 A. P. Liavas, G. Kostoulas, G. Lourakis, K. Huang, and N. D. Sidiropoulos, "Nesterovbased Alternating Optimization for Nonnegative Tensor Factorization: Algorithm and Parallel Implementations," IEEE Transactions on Signal Processing, vol. 66, no. 4, Febr. 2018 MPI_CODE
 K. Huang, N. D. Sidiropoulos, and A. P. Liavas, "A Flexible and Efficient Algorithmic Framework for Constrained Matrix and Tensor Factorization," ΙΕΕΕ Transactions on Signal Processing, vol. 64, Issue 19, 1 October 2016, Pages 50525065.
 A. P. Liavas, and N.D. Sidiropoulos, "Parallel Algorithms for Constrained Tensor Factorization via the Alternating Direction Method of Multipliers," IEEE Trans. on Signal Processing,Volume 63, no. 20, October 2015, Pages 54505463.
 A. P. Liavas and D. Tsipouridou, "Singlecarrier systems with MMSE linear equalizers: performance degradation due to channel and CFO estimation errors," IEEE Trans. Signal Proc.,vol. 60, no 6, pp 33283334, June 2012.
 G. N. Karystinos, and A. P. Liavas, "Efficient Computation of the Binary Vector that Maximizes a Rankdeficient Quadratic Form," IEEE Trans. on Information Theory, vol. 56, pp. 35813593, July 2010.
 D. Tsipouridou and A. P. Liavas, "On the sensitivity of the MIMO TomlinsonHarashima precoder with respect to channel uncertainties," IEEE Trans. on Signal Processing, vol. 58, no.4,pp. 22612272, April 2010.
 D. Tsipouridou and A. P. Liavas, "On the sensitivity of the transmit MIMO Wiener filter with respect
to channel and noise secondorder statistics uncertainties," IEEE Trans. Signal Proc.,
vol. 56, no. 2, pp. 832838, February 2008.
 A. P. Liavas and D. Tsipouridou, "On the performance of the mismatched MMSE and the
LS linear equalizers," IEEE Trans. Signal Proc., vol. 55, no. 7, part 1, pp. 33023311, July 2007.
 A. P. Liavas, "On the sensitivity of a suboptimum precoding scheme for frequencyselective
block based channel with respect to channel inaccuracies," IEEE Trans. Information Theory,
vol 51, no. 9, pp. 33743381, September 2005.
 A. P. Liavas, "TomlinsonHarashima precoding with partial channel knowledge," IEEE Trans.
Communications, vol. 53, no 1, pp. 59, January 2005.
 A. P. Liavas, "On the robustness of the finitelength MMSEDFE with respect to channel
and secondorder statistics estimation errors," IEEE Trans. Signal Processing, vol. 50, no.
11, pp. 28662874, November 2002.
 A. Beikos and A. P. Liavas, "Performance analysis and comparison of blind to nonblind least
squares equalization with respect to effective channel overmodeling," Signal Processing, vol.
82, pp. 12331253, September 2002.
 A. P. Liavas and P. A. Regalia, "On the behavior of information theoretic criteria for model
order selection," IEEE Trans. Signal Processing, vol. 49, no. 8, pp. 16891695, August 2001.
 JP. Delmas, H. Gazzah, A. P. Liavas and P. A. Regalia, "Statistical analysis of some second
order methods for blind channel identification/equalization with respect to channel undermodeling," IEEE Trans. Signal Processing, vol. 48, no. 7, pp. 19841998, July 2000.
 A. P. Liavas, "Leastsquares equalization performance versus equalization delay," IEEE Trans.
Signal Processing, vol. 48, no. 6, pp. 18321835, June 2000.
 A. P. Liavas, P. A. Regalia and JP. Delmas, "On the robustness of the linear prediction method for blind channel identification with respect to effective channel undermodeling/overmodeling," IEEE Trans. Signal Processing, vol. 48, no. 5, pp. 14771481, May 2000.
 A. P. Liavas, P. A. Regalia and JP. Delmas, "Blind channel approximation: Effective channel
length determination," IEEE Trans. Signal Processing, vol. 47, no. 12, pp. 33363344, December 1999.
 A. P. Liavas, P. A. Regalia and JP. Delmas,"Robustness of the least squares and subspace
methods for blind channel identificationequalization with respect to effective channel undermodelingovermodeling,"IEEE Trans. Signal Processing, vol. 47, no. 6, pp. 16361645,
June 1999.
 A. P. Liavas and P. A. Regalia, "On the numerical stability and accuracy of the conventional
RLS algorithm," IEEE Trans. Signal Processing, vol. 47, no. 1, pp. 8896, January 1999.
 A. P. Liavas and P. A. Regalia, "Acoustic echo cancellation: Do IIR models offer better
modelling capabilities than their FIR counterparts?," IEEE Trans. Signal Processing, vol.
46, no. 9, pp. 24992504, September 1998.
 A. P. Liavas, G.V. Moustakides, G. Henning, E. Psarakis and P. Husar, "A Periodogram
based method for the detection of SteadyState Visually Evoked Potentials," IEEE Trans.
Biomedical Engineering, vol. 45, no. 2, pp. 242248, February 1998.
 A. P. Liavas and S. Theodoridis, "Efficient Levinson and Schurtype algorithms for block
neartoToeplitz systems of equations," Signal Processing, vol. 35, pp. 241255, 1994.
 S. Theodoridis and A. P. Liavas, "Highly concurrent algorithm for the solution of ?Toeplitz
system of equations," Signal Processing vol. 24, pp. 165176, 1991.
Publications in conferences
 I. Siaminou and A. P. Liavas, "An Accelerated Stochastic Gradient for Canonical Polyadic Decomposition," EUSIPCO 2021, Dublin, 2228 August, 2021.
 I. Siaminou, I.M. Papagiannakos, C. Kolomvakis and A. P. Liavas, "Accelerated Stochastic Gradient for Nonnegative Tensor Completion and Parallel Implementation," EUSIPCO 2021, Dublin, 2228 August, 2021.
 Paris A. Karakasis, Athanasios P. Liavas, Nicholas D. Sidiropoulos, Panagiotis G. Simos, and Efrosyni Papadaki "Multisubject RestingState fMRI Data Analysis via Generalized Canonical Correlation Analysis," EUSIPCO 2020, Amsterdam, 2428 August, 2020.
 Paris A. Karakasis, Athanasios P. Liavas, Nicholas D. Sidiropoulos, Panagiotis G. Simos, and Efrosyni Papadaki "Multisubject Taskrelated fMRI Data Analysis via Generalized Canonical Correlation Analysis," 42nd Annual International Conferences of the IEEE Engineering in Medicine and Biology Society, Montreal, July 2020
 P. A. Karakasis and A. P. Liavas "Alternating Optimization for Tensor Factorization with Orthogonality Constraints: Algorithm and Parallel Implementation," International Conference on High Performance Computing & Simulation (HPCS), Orleans, July 2018
 G. Lourakis, A. P. Liavas "Nesterovbased Alternating Optimization for Nonnegative Tensor Completion: Algorithm and Parallel Implementation," Proc. IEEE 19th International Workshop on Signal Processing Αdvances in Wireless Communications (SPAWC), Kalamata, June 2018
 A. P. Liavas, G. Kostoulas, G. Lourakis, K. Huang, and N. D. Sidiropoulos, "Nesterovbased parallel algorithm for largescale nonnegative tensor factorization," 2017 International Conference on Acoustics, Speech, and Signal Processing (ICASSP), New Orleans, March 2017.
 K. Huang, N. D. Sidiropoulos, and A. P. Liavas, "Efficient algorithms for `universally' constrained matrix and tensor factorization," 23rd European Signal Processing Conference, EUSIPCO 2015, Sept. 2015.
 A. P. Liavas and N. D. Sidiropoulos "Parallel Algorithms for Large Scale Constrained Tensor Decomposition," IEEE ICASSP 2015, Brisbane Australia.
 A. P. Liavas and D. Tsipouridou "SingleCarrier systems with MMSE linear equalizers: performance degradation due to channel and CFO estimation errors," IEEE ICASSP 2011, Prague.
 G. N. Karystinos and A. P. Liavas, "Efficient computation of the binary vector that maximizes a rankdeficient quadratic form," IEEE ICASSP 2008, Las Vegas.
 G. N. Karystinos and A. P. Liavas,"Outage capacity of a cooperative sheme with bimary input and a simple relay," IEEE ICASSP 2008, Las Vegas.
 D. Tsipouridou and A. P. Liavas, "On the robustness of the transmit Wiener filter with
respect to channel estimation errors," IEEE ICASSP 2007, Hawaii.
 G. N. Karystinos and A. P. Liavas, "Efficient computation of the binary vector that maximizes
a rank3 quadratic form," in Proc. 2006 Allerton Conference on Communication, Control,
and Computing, Allerton House, Monticello, IL Sept. 2006, pp. 1286129
 A. P. Liavas, "Sensitivity analysis of a suboptimal precoding scheme for block channels with
respect to channel inaccuracies," IEEE ICASSP, March 2005.
 A. P. Liavas, "Robustness of the finitelength MMSEDFE with respect to channel and second
order statistics estimation errors," Proc. EUSIPCO, Toulouse, August 2002.
 A. P. Liavas, "On the robustness of the finitelength MMSEDFE with respect to channel
and secondorder statistics estimation errors," Proc. IEEE Workshop on Statistical Signal
Processing, Singapore, August 2001.
 JP. Delmas, H. Gazzah and A. P. Liavas, "Statistical analysis of secondorder statistics
methods for blind channel identification," Proc. First Int. Conf. on Mathematics for Signal
Processing, London, December 1998.
 A. P. Liavas, P. A. Regalia and JP. Delmas, "Blind channel approximation: Effective channel
length determination," Proc. Asilomar Conf. on Signals, Systems and Computers, Pacific
Grove, CA, November 1998.
 A. P. Liavas, P. A. Regalia and JP. Delmas, "Robustness of leastsquares and subspace
methods for blind channel identification/equalization algorithms with respect to channel un
dermodeling," Proc. EUSIPCO, Rodos, September 1998.
 A. P. Liavas and P. A. Regalia, "Numerical accuracy issues of recursive least squares algo
rithms," Proc. IEEE Int. Conf. Acoustics, Speech and Signal Processing 1998, Seattle, May
1998.
 A. P. Liavas and P. A. Regalia, "Performance Assesments of IIR and FIR models for Acoustic
Echo Cancellation," Proc. Inter. Workshop on Acoustic Echo and Noise Control, London,
Sept. 1997.
 A. P. Liavas, G. V. Moustakides, G. Henning, E. Psarakis and P. Husar, "On the detection of SteadyState Visually Evoked Potentials," Proc. IEEE Int. Conf. Biomedical Eng.,
Amsterdam, November 1996.
 A. P. Liavas and S. Theodoridis, "Novel Schurtype algorithm for neartoToeplitz linear
systems with multichannel entries," Proc. EUSIPCO, Brussels, August 1992, pp. 879882.
 A. P. Liavas and S. Theodoridis, "Efficient Levinsontype algorithm for block ρ Toeplitz
system solution," Proc. IEEE Int. Conference Acoustics, Speech and Signal Processing,
Toronto, May 1991. pp. 22652268.
Technical Reports
 A. P. Liavas and D. Tsipouridou "SingleCarrier systems with MMSE linear equalizers: performance degradation due to channel and CFO estimation errors," Technical report, June 2011.
Teaching
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