Alex Alvarado

ORCID

Publication Activity (10 Years)

Years Active: 2003-2024
Publications (10 Years): 143

Top Venues

Chalmers University of Technology, Gothenburg, Sweden (PHD)

Education History

Chalmers University of Technology, Gothenburg, Sweden

PHD

Publications

Mohammad Farsi, Hamdi Joudeh, Gabriele Liga, Alex Alvarado, Magnus Karlsson, Erik Agrell
On the Capacity of Correlated MIMO Phase-Noise Channels: An Electro-Optic Frequency Comb Example. CoRR (2024)
Chin-Hung Chen, Boris Karanov, Wim J. van Houtum, Wu Yan, Alex Young, Alex Alvarado
On the Robustness of Deep Learning-Aided Symbol Detectors to Varying Conditions and Imperfect Channel Knowledge. WCNC (2024)
Musa Furkan Keskin, Carina Marcus, Olof Eriksson, Alex Alvarado, Joerg Widmer, Henk Wymeersch
Integrated Sensing and Communications With MIMO-OTFS: ISI/ICI Exploitation and Delay-Doppler Multiplexing. IEEE Trans. Wirel. Commun. 23 (8) (2024)
Chin-Hung Chen, Boris Karanov, Wim J. van Houtum, Wu Yan, Alex Young, Alex Alvarado
On the Robustness of Deep Learning-aided Symbol Detectors to Varying Conditions and Imperfect Channel Knowledge. CoRR (2024)
Franz Lampel, Alex Alvarado, Frans M. J. Willems
A Sliding-Window LMMSE Turbo Equalization Scheme for OTFS. IEEE Commun. Lett. 27 (12) (2023)
Zhiwei Liang, Bin Chen, Yi Lei, Gabriele Liga, Alex Alvarado
Analytical Model of Nonlinear Fiber Propagation for General Dual-Polarization Four-Dimensional Modulation Format. CoRR (2023)
Bin Chen, Zhiwei Liang, Shen Li, Yi Lei, Gabriele Liga, Alex Alvarado
On the Performance of Multidimensional Constellation Shaping for Linear and Nonlinear Optical Fiber Channel. CoRR (2023)
Bin Chen, Gabriele Liga, Yi Lei, Wei Ling, Zhengyan Huan, Xuwei Xue, Alex Alvarado
Shaped Four-Dimensional Modulation Formats for Optical Fiber Communication Systems. OFC (2022)
Yunus Can Gültekin, Olga Vassilieva, Inwoong Kim, Paparao Palacharla, Chigo Okonkwo, Alex Alvarado
On Optimum Enumerative Sphere Shaping Blocklength at Different Symbol Rates for the Nonlinear Fiber Channel. CoRR (2022)
Lotte Paulissen, Alex Alvarado, Kaiquan Wu, Alexios Balatsoukas-Stimming
Reducing the Error Floor of the Sign-Preserving Min-Sum LDPC Decoder via Message Weighting of Low-Degree Variable Nodes. CoRR (2022)
Zhiwei Liang, Bin Chen, Yi Lei, Gabriele Liga, Alex Alvarado
Extension and Validation of 4D Model for Improving the Accuracy of Modulation-Dependent Nonlinear Interference. CoRR (2022)
Youssef Jaffal, Alex Alvarado
Pulses With Minimum Residual Intersymbol Interference for Faster Than Nyquist Signaling. IEEE Commun. Lett. 26 (11) (2022)
Yunus Can Gültekin, Frans M. J. Willems, Alex Alvarado
Band-ESS: Streaming Enumerative Coding with Applications to Probabilistic Shaping. GLOBECOM (2022)
Franz Lampel, Hamdi Joudeh, Alex Alvarado, Frans M. J. Willems
Orthogonal Time Frequency Space Modulation Based on the Discrete Zak Transform. Entropy 24 (12) (2022)
Yunus Can Gültekin, Olga Vassilieva, Inwoong Kim, Paparao Palacharla, Chigo Okonkwo, Alex Alvarado
On Optimum Enumerative Sphere Shaping Blocklength at Different Symbol Rates for the Nonlinear Fiber Channel. OECC/PSC (2022)
Viswanathan Ramachandran, Gabriele Liga, Astrid Barreiro, Alex Alvarado
Capacity Bounds for Optical WDM Channels with Peak Power Constraints. CoRR (2022)
Franz Lampel, Alex Alvarado, Frans M. J. Willems
On OTFS using the Discrete Zak Transform. ICC Workshops (2022)
Yunus Can Gültekin, Frans M. J. Willems, Alex Alvarado
Log-CCDM: Distribution Matching via Multiplication-free Arithmetic Coding. ISIT (2022)
Bin Chen, Yi Lei, Gabriele Liga, Zhiwei Liang, Wei Ling, Xuwei Xue, Alex Alvarado
Geometrically-Shaped Multi-Dimensional Modulation Formats in Coherent Optical Transmission Systems. CoRR (2022)
Gabriele Liga, Bin Chen, Alex Alvarado
Model-aided Geometrical Shaping of Dual-polarization 4D Formats in the Nonlinear Fiber Channel. OFC (2022)
Yunus Can Gültekin, Frans M. J. Willems, Alex Alvarado
Band-ESS: Streaming Enumerative Coding with Applications to Probabilistic Shaping. CoRR (2022)
Yunus Can Gültekin, Frans M. J. Willems, Alex Alvarado
Log-CCDM: Distribution Matching via Multiplication-free Arithmetic Coding. CoRR (2022)
Yunus Can Gültekin, Alex Alvarado, Olga Vassilieva, Inwoong Kim, Paparao Palacharla, Chigo M. Okonkwo, Frans M. J. Willems
Mitigating Nonlinear Interference by Limiting Energy Variations in Sphere Shaping. OFC (2022)
Viswanathan Ramachandran, Gabriele Liga, Astrid Barreiro, Alex Alvarado
Capacity Region Bounds for K-User Optical WDM Channels with Peak Power Constraints. OFC (2022)
Yi Lei, Bin Chen, Gabriele Liga, Alex Alvarado
On Parameter Optimization and Reach Enhancement for the Improved Soft-Aided Staircase Decoder. ISTC (2021)
Yunus Can Gültekin, Alex Alvarado, Olga Vassilieva, Inwoong Kim, Paparao Palacharla, Chigo M. Okonkwo, Frans M. J. Willems
On Kurtosis-limited Enumerative Sphere Shaping for Reach Increase in Single-span Systems. ECOC (2021)
Viswanathan Ramachandran, Gabriele Liga, Astrid Barreiro, Alex Alvarado
Capacity Region Bounds for the K user Dispersive Nonlinear Optical WDM Channel with Peak Power Constraints. CoRR (2021)
Bin Chen, Wei Ling, Yunus Can Gültekin, Yi Lei, Chigo Okonkwo, Alex Alvarado
Low-Complexity Geometrical Shaping for 4D Modulation Formats via Amplitude Coding. CoRR (2021)
Gabriele Liga, Bin Chen, Astrid Barreiro, Alex Alvarado
Modeling of Nonlinear Interference Power for Dual-Polarization 4D Formats. OFC (2021)
Gabriele Liga, Bin Chen, Alex Alvarado
Model-aided Geometrical Shaping of Dual-polarization 4D Formats in the Nonlinear Fiber Channel. CoRR (2021)
Amirashkan Farsaei, Ulf Gustavsson, Alex Alvarado, Frans M. J. Willems
A Low-Complexity Hybrid Linear and Nonlinear Precoder for Line-Of-Sight Massive MIMO With Max-Min Power Control. IEEE Trans. Wirel. Commun. 20 (12) (2021)
Amirashkan Farsaei, Ulf Gustavsson, Alex Alvarado, Frans M. J. Willems
An Improved Successive Filter-Based Dropping Algorithm for Massive MIMO With Max-Min Power Control. IEEE Commun. Lett. 25 (9) (2021)
Amirashkan Farsaei, Alireza Sheikh, Ulf Gustavsson, Alex Alvarado, Frans M. J. Willems
DropNet: An Improved Dropping Algorithm Based on Neural Networks for Line-of-Sight Massive MIMO. IEEE Access 9 (2021)
Viswanathan Ramachandran, Astrid Barreiro, Gabriele Liga, Alex Alvarado
A Capacity Region Outer Bound for the Two-User Dispersive Nonlinear Fiber Optical Channel. CoRR (2021)
Erik Agrell, Marco Secondini, Alex Alvarado, Tsuyoshi Yoshida
Performance Prediction Recipes for Optical Links. CoRR (2021)
Yunus Can Gültekin, Alex Alvarado, Olga Vassilieva, Inwoong Kim, Paparao Palacharla, Chigo M. Okonkwo, Frans M. J. Willems
On Kurtosis-limited Enumerative Sphere Shaping for Reach Increase in Single-span Systems. CoRR (2021)
Musa Furkan Keskin, Henk Wymeersch, Alex Alvarado
Radar Sensing with OTFS: Embracing ISI and ICI to Surpass the Ambiguity Barrier. ICC Workshops (2021)
Boris Karanov, Laurent Schmalen, Alex Alvarado
Distance-Agnostic Auto-Encoders for Short Reach Fiber Communications. OFC (2021)
Yi Lei, Bin Chen, Gabriele Liga, Alex Alvarado
On Parameter Optimization and Reach Enhancement for the Improved Soft-Aided Staircase Decoder. CoRR (2021)
Kaiquan Wu, Gabriele Liga, Yunus Can Gültekin, Alex Alvarado
Exponentially-Weighted Energy Dispersion Index for the Nonlinear Interference Analysis of Finite-Blocklength Shaping. ECOC (2021)
Yi Lei, Bin Chen, Gabriele Liga, Alexios Balatsoukas-Stimming, Kaixuan Sun, Alex Alvarado
A Soft-Aided Staircase Decoder Using Three-Level Channel Reliabilities. CoRR (2021)
Mehrangiz Ensan, Hamdi Joudeh, Alex Alvarado, Ulf Gustavsson, Frans M. J. Willems
On Cloud Radio Access Networks With Cascade Oblivious Relaying. ITW (2021)
Franz Lampel, Alex Alvarado, Frans M. J. Willems
Orthogonal Time Frequency Space Modulation: A Discrete Zak Transform Approach. CoRR (2021)
Amirashkan Farsaei, Navid Amani, Rob Maaskant, Ulf Gustavsson, Alex Alvarado, Frans M. J. Willems
Uniform Linear Arrays With Optimized Inter-Element Spacing for LOS Massive MIMO. IEEE Commun. Lett. 25 (2) (2021)
Kaiquan Wu, Gabriele Liga, Alireza Sheikh, Frans M. J. Willems, Alex Alvarado
Temporal Energy Analysis of Symbol Sequences for Fiber Nonlinear Interference Modelling via Energy Dispersion Index. CoRR (2021)
Bin Chen, Chigo Okonkwo, Alex Alvarado
Nonlinear Interference Analysis of Probabilistic Shaping vs. 4D Geometrically Shaped Formats. CoRR (2020)
Yu Chen, Iman Tavakkolnia, Alex Alvarado, Majid Safari
On the Capacity of Amplitude Modulated Soliton Communication over Long Haul Fibers. Entropy 22 (8) (2020)
Yunus Can Gültekin, Tobias Fehenberger, Alex Alvarado, Frans M. J. Willems
Probabilistic Shaping for Finite Blocklengths: Distribution Matching and Sphere Shaping. Entropy 22 (5) (2020)
Abdelkerim Amari, Lutz Lampe, O. S. Sunish Kumar, Yunus Can Gultekin, Alex Alvarado
Comparison of Short Blocklength Sphere Shaping and Nonlinearity Compensation in WDM Systems. CoRR (2020)
Bin Chen, Chigo Okonkwo, Alex Alvarado
Nonlinear Interference Analysis of Probabilistic Shaping vs. 4D Geometrically Shaped Formats. ECOC (2020)
Vinícius Oliari, Erik Agrell, Alex Alvarado
Logarithmic Perturbation Models in the Weak-Dispersion Regime with Applications to Passive Optical Networks. ECOC (2020)
Gabriele Liga, Astrid Barreiro, Hami Rabbani, Alex Alvarado
Extending Fibre Nonlinear Interference Power Modelling to Account for General Dual-Polarisation 4D Modulation Formats. Entropy 22 (11) (2020)
Christian Häger, Henry D. Pfister, Rick M. Bütler, Gabriele Liga, Alex Alvarado
Model-Based Machine Learning for Joint Digital Backpropagation and PMD Compensation. CoRR (2020)
Tobias A. Eriksson, Ruben S. Luís, Kadir Gümüs, Georg Rademacher, Benjamin J. Puttnam, Hideaki Furukawa, Naoya Wada, Yoshinari Awaji, Alex Alvarado, Masahide Sasaki, Masahiro Takeoka
Digital Self-Coherent Continuous Variable Quantum Key Distribution System. OFC (2020)
Yunus Can Gültekin, Alex Alvarado, Frans M. J. Willems
Achievable Information Rates for Probabilistic Amplitude Shaping: A Minimum-Randomness Approach via Random Sign-Coding Arguments. CoRR (2020)
Alireza Sheikh, Alexandre Graell i Amat, Gianluigi Liva, Alex Alvarado
Refined Reliability Combining for Binary Message Passing Decoding of Product Codes. CoRR (2020)
Bin Chen, Alex Alvarado, Sjoerd van der Heide, Menno van den Hout, Hartmut Hafermann, Chigo Okonkwo
Analysis and Experimental Demonstration of Orthant-Symmetric Four-dimensional 7 bit/4D-sym Modulation for Optical Fiber Communication. CoRR (2020)
Alireza Sheikh, Alexandre Graell i Amat, Alex Alvarado
On Product Codes With Probabilistic Amplitude Shaping for High-Throughput Fiber-Optic Systems. IEEE Commun. Lett. 24 (11) (2020)
Alireza Sheikh, Alexandre Graell i Amat, Alex Alvarado
Novel High-Throughput Decoding Algorithms for Product and Staircase Codes based on Error-and-Erasure Decoding. CoRR (2020)
Bin Chen, Yi Lei, Gabriele Liga, Chigo Okonkwo, Alex Alvarado
Hard-Decision Coded Modulation for High-Throughput Short-Reach Optical Interconnect. Entropy 22 (4) (2020)
Christian Häger, Henry D. Pfister, Rick M. Bütler, Gabriele Liga, Alex Alvarado
Model-Based Machine Learning for Joint Digital Backpropagation and PMD Compensation. OFC (2020)
Boris Karanov, Vinícius Oliari, Mathieu Chagnon, Gabriele Liga, Alex Alvarado, Vahid Aref, Domaniç Lavery, Polina Bayvel, Laurent Schmalen
End-to-End Learning in Optical Fiber Communications: Experimental Demonstration and Future Trends. ECOC (2020)
Yunus Can Gültekin, Alex Alvarado, Frans M. J. Willems
Achievable Information Rates for Probabilistic Amplitude Shaping: An Alternative Approach via Random Sign-Coding Arguments. Entropy 22 (7) (2020)
Kadir Gümüs, Alex Alvarado, Bin Chen, Christian Häger, Erik Agrell
End-to-End Learning of Geometrical Shaping Maximizing Generalized Mutual Information. OFC (2020)
Tobias A. Eriksson, Ruben S. Luís, Georg Rademacher, Benjamin J. Puttnam, Kadir Gümüs, Laurent Schmalen, Alex Alvarado, Hideaki Furukawa, Naoya Wada, Takuya Hirano, Masahide Sasaki, Masahiro Takeoka
Challenges in Coding, DSP and Parallel Operation of Quantum Key Distribution and Coherent Data Transmission. ECOC (2020)
Rick M. Bütler, Christian Häger, Henry D. Pfister, Gabriele Liga, Alex Alvarado
Model-Based Machine Learning for Joint Digital Backpropagation and PMD Compensation. CoRR (2020)
Bin Chen, Yi Lei, Sjoerd van der Heide, John van Weerdenburg, Alex Alvarado, Chigo Okonkwo
First Experimental Verification of Improved Decoding of Staircase Codes using Marked Bits. OFC (2019)
Gabriele Liga, Alireza Sheikh, Alex Alvarado
A novel soft-aided bit-marking decoder for product codes. CoRR (2019)
Yi Lei, Bin Chen, Gabriele Liga, Xiong Deng, Zizheng Cao, Jianqiang Li, Kun Xu, Alex Alvarado
Improved Decoding of Staircase Codes: The Soft-Aided Bit-Marking (SABM) Algorithm. IEEE Trans. Commun. 67 (12) (2019)
Amirashkan Farsaei, Alex Alvarado, Frans M. J. Willems, Ulf Gustavsson
An Improved Dropping Algorithm for Line-of-Sight Massive MIMO With Max-Min Power Control. IEEE Commun. Lett. 23 (6) (2019)
Abdelkerim Amari, Xiang Lin, Octavia A. Dobre, Ramachandran Venkatesan, Alex Alvarado
A Machine Learning-Based Detection Technique for Optical Fiber Nonlinearity Mitigation. CoRR (2019)
Alex Alvarado, Gabriele Liga, Yi Lei, Bin Chen, Alexios Balatsoukas-Stimming
Improving HD-FEC decoding via bit marking. CoRR (2019)
Sjoerd van der Heide, Bin Chen, Menno van den Hout, Gabriele Liga, Ton Koonen, Hartmut Hafermann, Alex Alvarado, Chigo Okonkwo
11, 700 km Transmission at 4.8 bit/4D-sym via Four-dimensional Geometrically-shaped Polarization-Ring-Switching Modulation. OECC/PSC (2019)
Sebastiaan Goossens, Sjoerd van der Heide, Menno van den Hout, Abdelkerim Amari, Yunus Can Gültekin, Olga Vassilieva, Inwoong Kim, Tadashi Ikeuchi, Frans M. J. Willems, Alex Alvarado, Chigo Okonkwo
First Experimental Demonstration of Probabilistic Enumerative Sphere Shaping in Optical Fiber Communications. OECC/PSC (2019)
Tobias Fehenberger, Alex Alvarado
Analysis and Optimisation of Distribution Matching for the Nonlinear Fibre Channel. CoRR (2019)
Alireza Sheikh, Alexandre Graell i Amat, Gianluigi Liva, Alex Alvarado
On Parameter Optimization of Product Codes for Iterative Bounded Distance Decoding with Scaled Reliability. CoRR (2019)
Sebastiaan Goossens, Sjoerd van der Heide, Menno van den Hout, Abdelkerim Amari, Yunus Can Gültekin, Olga Vassilieva, Inwoong Kim, Tadashi Ikeuchi, Frans M. J. Willems, Alex Alvarado, Chigo Okonkwo
First Experimental Demonstration of Probabilistic Enumerative Sphere Shaping in Optical Fiber Communications. CoRR (2019)
Alireza Sheikh, Alexandre Graell i Amat, Alex Alvarado
On Product Codes with Probabilistic Amplitude Shaping for High-Throughput Fiber-Optic Systems. CoRR (2019)
Amirashkan Farsaei, Alex Alvarado, Frans M. J. Willems, Ulf Gustavsson
An Improved Dropping Algorithm for Line-of-Sight Massive MIMO With Tomlinson-Harashima Precoding. IEEE Commun. Lett. 23 (11) (2019)
Vinícius Oliari, Erik Agrell, Alex Alvarado
Regular perturbation for the weak-dispersion regime. ICTON (2019)
Gabriele Liga, Bin Chen, Sjoerd van der Heide, Alireza Sheikh, Menno van den Hout, Chigo Okonkwo, Alex Alvarado
30% Reach Increase via Low-complexity Hybrid HD/SD FEC and Nonlinearity-tolerant 4D Modulation. CoRR (2019)
Abdelkerim Amari, Xiang Lin, Octavia A. Dobre, Ramachandran Venkatesan, Alex Alvarado
Fiber Nonlinearity Mitigation via the Parzen Window Classifier for Dispersion Managed and Unmanaged Links. ICTON (2019)
Bin Chen, Chigo Okonkwo, Hartmut Hafermann, Alex Alvarado
Polarization-ring-switching for nonlinearity-tolerant geometrically-shaped four-dimensional formats maximizing generalized mutual information. CoRR (2019)
Christian Häger, Henry D. Pfister, Rick M. Bütler, Gabriele Liga, Alex Alvarado
Revisiting Multi-Step Nonlinearity Compensation with Machine Learning. CoRR (2019)
Abdelkerim Amari, Sebastiaan Goossens, Yunus Can Gultekin, Olga Vassilieva, Inwoong Kim, Tadashi Ikeuchi, Chigo Okonkwo, Frans M. J. Willems, Alex Alvarado
Enumerative Sphere Shaping for Rate Adaptation and Reach Increase in WDM Transmission Systems. CoRR (2019)
Tsuyoshi Yoshida, Alex Alvarado, Magnus Karlsson, Erik Agrell
Post-FEC BER Prediction for Bit-Interleaved Coded Modulation with Probabilistic Shaping. CoRR (2019)
Abdelkerim Amari, Sebastiaan Goossens, Yunus Can Gultekin, Olga Vassilieva, Inwoong Kim, Tadashi Ikeuchi, Chigo Okonkwo, Frans M. J. Willems, Alex Alvarado
Introducing Enumerative Sphere Shaping for Optical Communication Systems with Short Blocklengths. CoRR (2019)
Abdelkerim Amari, Xiang Lin, Octavia A. Dobre, Ramachandran Venkatesan, Alex Alvarado
Fiber Nonlinearity Mitigation via the Parzen Window Classifier for Dispersion Managed and Unmanaged Links. CoRR (2019)
Alex Alvarado, Gabriele Liga, Yi Lei, Bin Chen, Alexios Balatsoukas-Stimming
Improving HD-FEC decoding via bit marking. OECC/PSC (2019)
Kadir Gümüs, Alex Alvarado, Bin Chen, Christian Häger, Erik Agrell
End-to-End Learning of Geometrical Shaping Maximizing Generalized Mutual Information. CoRR (2019)
Bin Chen, Chigo Okonkwo, Domaniç Lavery, Alex Alvarado
Geometrically-shaped 64-point Constellations via Achievable Information Rates. ICTON (2018)
Iman Tavakkolnia, Alex Alvarado, Majid Safari
Capacity Estimates of Single Soliton Communication. ECOC (2018)
Amirashkan Farsaei, Frans M. J. Willems, Alex Alvarado, Ulf Gustavsson
A Reduced-Complexity Linear Precoding Strategy for Massive MIMO Base Stations. ICT (2018)
Bin Chen, Chigo Okonkwo, Hartmut Hafermann, Alex Alvarado
Increasing Achievable Information Rates via Geometric Shaping. ECOC (2018)
Alex Alvarado, Erik Agrell, Fredrik Brannstrom
Asymptotic Comparison of ML and MAP Detectors for Multidimensional Constellations. IEEE Trans. Inf. Theory 64 (2) (2018)
Eric Sillekens, Daniel Semrau, Gabriele Liga, Nikita A. Shevchenko, Zhe Li, Alex Alvarado, Polina Bayvel, Robert I. Killey, Domaniç Lavery
A Simple Nonlinearity-Tailored Probabilistic Shaping Distribution for Square QAM. OFC (2018)
Alex Alvarado, Yi Lei, David S. Millar
Achievable Information Rate Losses for High Order Modulation and Hard-Decision Forward Error Correction. ECOC (2018)
Bin Chen, Chigo Okonkwo, Hartmut Hafermann, Alex Alvarado
Increasing Achievable Information Rates via Geometric Shaping. CoRR (2018)
Yi Lei, Alex Alvarado, Bin Chen, Xiong Deng, Zizheng Cao, Jianqiang Li, Kun Xu
Decoding Staircase Codes with Marked Bits. ISTC (2018)
Nikita A. Shevchenko, Stanislav A. Derevyanko, Jaroslaw E. Prilepsky, Alex Alvarado, Polina Bayvel, Sergei K. Turitsyn
Capacity Lower Bounds of the Noncentral Chi-Channel With Applications to Soliton Amplitude Modulation. IEEE Trans. Commun. 66 (7) (2018)

Alex Alvarado.css-eqlu8i{font-size:small;padding-left:4px;}

Publication Activity (10 Years)

Top Topics

Top Venues

Alex Alvarado