Alex Alvarado

Visar 51 publikationer

2017

Asymptotic comparison of ML and MAP detectors for multidimensional constellations

Alex Alvarado, Erik Agrell, Fredrik Brännström
IEEE Transactions on Information Theory
Artikel i vetenskaplig tidskrift
2017

Information rates of next-generation long-haul optical fiber systems using coded modulation

Gabriele Liga, Alex Alvarado, Erik Agrell et al
Journal of Lightwave Technology. Vol. 35 (1), p. 113-123
Artikel i vetenskaplig tidskrift
2016

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 i 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
Artikel i vetenskaplig tidskrift
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 i 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
Artikel i vetenskaplig tidskrift
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
Artikel i vetenskaplig tidskrift
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 i 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 i 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
Paper i proceeding
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 i 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
Artikel i vetenskaplig tidskrift
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
Artikel i vetenskaplig tidskrift
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
Artikel i vetenskaplig tidskrift
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 i proceeding
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
Artikel i vetenskaplig tidskrift
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
Artikel i vetenskaplig tidskrift
2013

Signal Shaping for BICM at Low SNR

Erik Agrell, Alex Alvarado
IEEE Transactions on Information Theory. Vol. 59 (4), p. 2396-2410
Artikel i vetenskaplig tidskrift
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 i proceeding
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
Artikel i vetenskaplig tidskrift
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 i 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 i 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 i proceeding
2012

General BER Expression for One-Dimensional Constellations

Mikhail Ivanov, Fredrik Brännström, Alex Alvarado et al
IEEE Transactions on Communications
Paper i 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]
Konferensbidrag (offentliggjort, men ej förlagsutgivet)
2012

Constellation Optimization for Coherent Optical Channels Distorted by Nonlinear Phase Noise

Christian Häger, Alexandre Graell i Amat, Alex Alvarado et al
Proc. IEEE Global Communications Conference (GLOBECOM) 2012, p. 2870-2875
Paper i 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 i proceeding
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 i proceeding
2011

Towards Fully Optimized BICM Transceivers

Md. Jahangir Hossain, Alex Alvarado, Leszek Szczecinski
IEEE Transactions on Communications. Vol. 59 (11), p. 3027-3039
Artikel i vetenskaplig tidskrift
2011

On BICM receivers for TCM transmission

Alex Alvarado, Leszek Szczecinski, Erik Agrell
IEEE Transactions on Communications. Vol. 59 (10), p. 2692-2702
Artikel i vetenskaplig tidskrift
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 i proceeding
2011

Constellation and Interleaver Design for BICM

Md. Jahangir Hossain, Alex Alvarado, Leszek Szczecinski
IEEE Global Communications Conference 2011
Paper i proceeding
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
Artikel i vetenskaplig tidskrift
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-
Artikel i vetenskaplig tidskrift
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
Artikel i vetenskaplig tidskrift
2010

On BICM-ID with Multiple Interleavers

Alex Alvarado, Leszek Szczecinski, Erik Agrell et al
IEEE Communications Letters. Vol. 14 (9), p. 785-787
Artikel i vetenskaplig tidskrift
2010

Towards Fully Optimized BICM Transmissions

Alex Alvarado
Doktorsavhandling
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 i 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 i proceeding
2009

Correcting Suboptimal Metrics in Iterative Decoders

Alex Alvarado, Víctor Núñez, Leszek Szczecinski et al
IEEE International Conference on Communications
Paper i proceeding
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 i 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 i proceeding
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
Artikel i vetenskaplig tidskrift
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
Artikel i vetenskaplig tidskrift
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 i proceeding
2008

On Bit-interleaved Coded Modulation with QAM Constellations

Alex Alvarado
Licentiatavhandling
2008

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

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

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