Alex Alvarado

Showing 58 publications

2020

Model-Based Machine Learning for Joint Digital Backpropagation and PMD Compensation

Christian Häger, Henry D. Pfister, Rick M. Bütler et al
Optical Fiber Communication Conference (OFC) 2020
Paper in proceeding
2020

Regular perturbation on the group-velocity dispersion parameter for nonlinear fibre-optical communications

Vinicius Oliari, Erik Agrell, Alex Alvarado
Nature Communications. Vol. 11 (1)
Journal article
2020

Revisiting Efficient Multi-Step Nonlinearity Compensation with Machine Learning: An Experimental Demonstration

Vinícius Oliari, Sebastiaan Goossens, Christian Häger et al
Journal of Lightwave Technology. Vol. 38 (12), p. 3114-3124
Journal article
2020

On Product Codes with Probabilistic Amplitude Shaping for High-Throughput Fiber-Optic Systems

Alireza Sheikh, Alexandre Graell I Amat, Alex Alvarado
IEEE Communications Letters. Vol. 24 (11), p. 2406-2410
Journal article
2020

End-to-End Learning of Geometrical Shaping Maximizing Generalized Mutual Information

Kadir Gümüş, Alex Alvarado, Bin Chen et al
2020 Optical Fiber Communications Conference and Exhibition, OFC 2020 - Proceedings. Vol. Part F174-OFC 2020
Paper in proceeding
2019

Revisiting Multi-Step Nonlinearity Compensation with Machine Learning

Christian Häger, Henry D. Pfister, Rick M. Bütler et al
IET Conference Publications. Vol. 2019
Paper in proceeding
2019

On parameter optimization of product codes for iterative bounded distance decoding with scaled reliability

Alireza Sheikh, Alexandre Graell I Amat, Gianluigi Liva et al
IET Conference Publications. Vol. 2019
Paper in proceeding
2019

Regular perturbation for the weak-dispersion regime

Vinícius Oliari, Erik Agrell, Alex Alvarado
2019 21st International Conference on Transparent Optical Networks (ICTON)
Paper in proceeding
2018

Asymptotic comparison of ML and MAP detectors for multidimensional constellations

Alex Alvarado, Erik Agrell, Fredrik Brännström
IEEE Transactions on Information Theory. Vol. 64 (2), p. 1231-1240
Journal article
2017

Achievable information rates of nonbinary codes for optical fiber transmission

Gabriele Liga, Alex Alvarado, Polina Bayvel et al
2016 IEEE Photonics Conference, IPC 2016, p. 309-310
Paper in proceeding
2016

On the Information Loss of the Max-Log Approximation in BICM Systems

Mikhail Ivanov, Christian Häger, Fredrik Brännström et al
IEEE Transactions on Information Theory. Vol. 62 (6), p. 3011 - 3025
Journal article
2016

Improved Achievable Information Rates by Optimized Four-Dimensional Demappers in Optical Transmission Experiments

Tobias Fehenberger, Tobias Eriksson, Alex Alvarado et al
2016 Optical Fiber Communications Conference and Exhibition (Ofc)
Paper in proceeding
2015

On Parameter Optimization for Staircase Codes

Christian Häger, Alexandre Graell i Amat, Henry D. Pfister et al
Proc. Optical Fiber Communication Conference and Exposition (OFC)
Paper in proceeding
2015

Optimum detection in presence of nonlinear distortions with memory

Gabriele Liga, Alex Alvarado, Erik Agrell et al
41st European Conference on Optical Communication, ECOC 2015, Valencia, Spain, 27 September - 1 October 2015. Vol. 2015-November
Paper in proceeding
2015

Four-Dimensional Coded Modulation with Bit-Wise Decoders for Future Optical Communications

Alex Alvarado, Erik Agrell
Journal of Lightwave Technology. Vol. 33 (10), p. 1993-2003
Journal article
2015

LDPC codes for optical channels: Is the "FEC limit" a good predictor of post-FEC BER?

Alex Alvarado, Erik Agrell, Domaniç Lavery et al
2015 Optical Fiber Communications Conference and Exhibition, (OFC) 2015, Los Angeles, United States, 22-26 March 2015, p. 7121706-
Paper in proceeding
2015

Terminated and Tailbiting Spatially-Coupled Codes with Optimized Bit Mappings for Spectrally Efficient Fiber-Optical Systems

Christian Häger, Alexandre Graell i Amat, Fredrik Brännström et al
Journal of Lightwave Technology. Vol. 33 (7), p. 1275-1285
Journal article
2014

On the Asymptotic Performance of Bit-Wise Decoders for Coded Modulation

Mikhail Ivanov, Alex Alvarado, Fredrik Brännström et al
IEEE Transactions on Information Theory. Vol. 60 (5), p. 2796-2804
Journal article
2014

Optimized Bit Mappings for Spatially Coupled LDPC Codes over Parallel Binary Erasure Channels

Christian Häger, Alexandre Graell i Amat, Alex Alvarado et al
Proc. 1st IEEE International Conference on Communications (ICC), p. 2064-2069
Paper in proceeding
2014

Improving soft FEC performance for higher-order modulations via optimized bit channel mappings

Christian Häger, Alexandre Graell i Amat, Fredrik Brännström et al
Optics Express. Vol. 22 (12), p. 14544-14558
Journal article
2014

Comparison of Terminated and Tailbiting Spatially Coupled LDPC Codes With Optimized Bit Mapping for PM-64-QAM

Christian Häger, Alexandre Graell i Amat, Fredrik Brännström et al
2014 European Conference on Optical Communication, ECOC 2014; Cannes; France; 21 September 2014 through 25 September 2014, p. Art. no. 6964047-
Paper in proceeding
2014

Capacity of a nonlinear optical channel with finite memory

Erik Agrell, Alex Alvarado, Giuseppe Durisi et al
Journal of Lightwave Technology. Vol. 32 (16), p. 2862-2876
Journal article
2013

On the Exact BER of Bit-Wise Demodulators for One-Dimensional Constellations

Mikhail Ivanov, Fredrik Brännström, Alex Alvarado et al
IEEE Transactions on Communications. Vol. 61 (4), p. 1450-1459
Journal article
2013

On Optimal TCM Encoders

Alex Alvarado, Alexandre Graell i Amat, Fredrik Brännström et al
IEEE Transactions on Communications. Vol. 61 (6), p. 2178 - 2189
Journal article
2013

Signal Shaping for BICM at Low SNR

Erik Agrell, Alex Alvarado
IEEE Transactions on Information Theory. Vol. 59 (4), p. 2396-2410
Journal article
2013

Design of APSK Constellations for Coherent Optical Channels with Nonlinear Phase Noise

Christian Häger, Alexandre Graell i Amat, Alex Alvarado et al
IEEE Transactions on Communications. Vol. 61 (8), p. 3362-3373
Journal article
2013

High-SNR Asymptotics of Mutual Information for Discrete Constellations

Alex Alvarado, Fredrik Brännström, Erik Agrell et al
IEEE International Symposium on Information Theory - Proceedings, p. 2274-2278
Paper in proceeding
2012

On the Equivalence of TCM Encoders

Alex Alvarado, Alexandre Graell i Amat, Fredrik Brännström et al
2012 IEEE International Symposium on Information Theory, ISIT 2012. Cambridge, MA, 1 - 6 July 2012, p. 2401-2405
Paper in proceeding
2012

First-order asymptotics of the BICM mutual information: Uniform vs. nonuniform distributions

Erik Agrell, Alex Alvarado
Information Theory and Applications Workshop (ITA) 2012, San Diego, CA [Invited], p. 306 - 310
Paper in proceeding
2012

General BER Expression for One-Dimensional Constellations

Mikhail Ivanov, Fredrik Brännström, Alex Alvarado et al
Proceedings - IEEE Global Communications Conference, GLOBECOM, p. 2162-2167
Paper in proceeding
2012

Achieving the Shannon Limit with Probabilistically Shaped BICM

Erik Agrell, Alex Alvarado
IEEE International Symposium on Information Theory - Proceedings, p. 2421-2425
Paper in proceeding
2012

Asymptotically optimal trellis coded modulation systems

Alexandre Graell i Amat, Alex Alvarado, Fredrik Brännström et al
Information Theory and Applications Workshop (ITA) 2012, San Diego, CA [Invited]
Other conference contribution
2012

Constellation Optimization for Coherent Optical Channels Distorted by Nonlinear Phase Noise

Christian Häger, Alexandre Graell i Amat, Alex Alvarado et al
Proceedings - IEEE Global Communications Conference, GLOBECOM, p. 2870-2875
Paper in proceeding
2012

An Efficient Algorithm to Calculate BICM Capacity

Georg Böcherer, Fabian Altenbach, Alex Alvarado et al
IEEE International Symposium on Information Theory (ISIT) 2012
Paper in proceeding
2011

On BICM receivers for TCM transmission

Alex Alvarado, Leszek Szczecinski, Erik Agrell
IEEE Transactions on Communications. Vol. 59 (10), p. 2692-2702
Journal article
2011

Towards Fully Optimized BICM Transceivers

Md. Jahangir Hossain, Alex Alvarado, Leszek Szczecinski
IEEE Transactions on Communications. Vol. 59 (11), p. 3027-3039
Journal article
2011

Optimal Alphabets and Binary Labelings for BICM at Low SNR

Erik Agrell, Alex Alvarado
IEEE Transactions on Information Theory. Vol. 57 (10), p. 6650-6672
Journal article
2011

High SNR Bounds for the BICM Capacity

Alex Alvarado, Fredrik Brännström, Erik Agrell
IEEE Information Theory Workshop ITW 2011, Paraty, Brazil, p. 360-364
Paper in proceeding
2011

On the performance of BICM with trivial interleavers in nonfading channels

Alex Alvarado, Leszek Szczecinski, Erik Agrell
IEEE International Conference on Communications ICC 2011
Paper in proceeding
2011

Constellation and Interleaver Design for BICM

Md. Jahangir Hossain, Alex Alvarado, Leszek Szczecinski
IEEE Global Communications Conference 2011
Paper in proceeding
2010

On BICM-ID with Multiple Interleavers

Alex Alvarado, Leszek Szczecinski, Erik Agrell et al
IEEE Communications Letters. Vol. 14 (9), p. 785-787
Journal article
2010

BICM Transmission using Non-Uniform QAM Constellations: Performance Analysis and Design

Md. Jahangir Hossain, Alex Alvarado, Leszek Szczecinski
IEEE International Conference on Communications
Paper in proceeding
2010

Corrections to 'Bit-interleaved coded modulation in the wideband regime'

Alex Alvarado, Erik Agrell, Albert Guillén i Fàbregas et al
IEEE Transactions on Information Theory. Vol. 56 (12), p. 6513-
Journal article
2010

Towards Fully Optimized BICM Transmissions

Alex Alvarado
Doctoral thesis
2010

Exploiting UEP in QAM-based BICM: Interleaver and Code Design

Alex Alvarado, Erik Agrell, Leszek Szczecinski et al
IEEE Transactions on Communications. Vol. 58 (2), p. 500-510
Journal article
2009

Distribution of L-values in Gray-mapped M^2-QAM: Closed-form Approximations and Applications

Alex Alvarado, Leszek Szczecinski, Rodolfo Feick et al
IEEE Transactions on Communications. Vol. 57 (7), p. 2071-2079
Journal article
2009

Unequal Error Protection in BICM with QAM Constellations: Interleaver and Code Design

Alex Alvarado, Erik Agrell, Leszek Szczecinski et al
IEEE International Conference on Communications
Paper in proceeding
2009

On optimal constellations for BICM at low SNR

Erik Agrell, Alex Alvarado
Proceedings IEEE Information Theory Workshop ITW 2009, Taormina, Italy [Best Poster Award], p. 480-484
Paper in proceeding
2009

On the Capacity of BICM with QAM Constellations

Alex Alvarado, Erik Agrell, Arne Svensson
Proceedings International Wireless Communications and Mobile Computing Conference, IWCMC'09, Leipzig, Germany [Invited], p. 573-579
Paper in proceeding
2009

Distribution of Max-Log Metrics for QAM-based BICM in Fading Channels

Leszek Szczecinski, Alex Alvarado, Rodolfo Feick
IEEE Transactions on Communications. Vol. 57 (9), p. 2558-2563
Journal article
2009

Correcting Suboptimal Metrics in Iterative Decoders

Alex Alvarado, Víctor Núñez, Leszek Szczecinski et al
IEEE International Conference on Communications
Paper in proceeding
2008

On the Design of Interleavers for BICM Transmission

Alex Alvarado, Leszek Szczecinski, Erik Agrell et al
Proceedings European Wireless Conference 2008, EW2008, Prague, Czech Republic
Paper in proceeding
2008

Closed-form approximation of Coded BER in QAM-based BICM Faded Transmission

Leszek Szczecinski, Alex Alvarado, Rodolfo Feick
IEEE Sarnoff Symposium 2008
Paper in proceeding
2007

On the Distribution of Extrinsic L-values in Gray-mapped 16-QAM

Alex Alvarado, Leszek Szczecinski, Rodolfo Feick
AMC International Wireless Communications and Mobile Computing Conference 2007, IWCMC 2007, p. 329-336
Paper in proceeding
2007

Distribution of L-values in Gray-mapped M^2-QAM Signals: Exact Expressions and Simple Approximations

Alex Alvarado, Leszek Szczecinski, Rodolfo Feick et al
IEEE Global Telecommunications Conference, GLOBECOM 2007, p. 1759-1764
Paper in proceeding
2007

Probability Density Functions of Reliability Metrics for 16-QAM-Based BICM Transmission in Rayleigh Channel

Leszek Szczecinski, Alex Alvarado, Rodolfo Feick
IEEE International Conference on Communications ICC 2007, p. 1012-1017
Paper in proceeding
2006

On Adaptive BICM with Finite Block-Length and Simplified Metrics Calculation

Alex Alvarado, Hector Carrasco, Rodolfo Feick
IEEE Vehicular Technology Conference 2006, VTC-2006 Fall
Paper in proceeding

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