preprints

  1. F. Carpi, C. Häger, M. Martalò, R. Raheli, H. D. Pfister, “Reinforcement Learning for Channel Coding: Learned Bit-Flipping Decoding, arXiv preprint, 2019
    Github link: github.com/fabriziocarpi/RLdecoding (code coming soon)
    arXiv

  2. C. Häger, H. D. Pfister, R. M. Bütler, G. Liga, A. Alvarado, “Revisiting Multi-Step Nonlinearity Compensation with Machine Learning, European Conf. Optical Communication (ECOC), invited, Dublin, Ireland, 2019
    arXiv

  3. J. Song, B. Peng, C. Häger, H. Wymeersch, A. Sahai, “Learning Physical-Layer Communication with Quantized Feedback, arXiv preprint, 2019
    arXiv

  4. M. Lian, F. Carpi, C. Häger, H. D. Pfister, “Learned Belief-Propagation Decoding with Simple Scaling and SNR Adaptation, IEEE Int. Symp. on Information Theory (ISIT), accepted, Paris, France, 2019
    arXiv

journal

  1. C. Häger and H. D. Pfister, “Approaching Miscorrection-free Performance of Product Codes with Anchor Decoding, IEEE Trans. Commun., vol. 66, no 7, pp. 2797-2808, July 2018
    arXiv | CPL | IEEE Xplore
    DOI:10.1109/TCOMM.2018.2816073

  2. C. Häger, H. D. Pfister, A. Graell i Amat, F. Brännström, “Density Evolution for Deterministic Generalized Product Codes on the Binary Erasure Channel at High Rates, IEEE Trans. Inf. Theory, vol. 63, no. 7, pp. 4357-4378, July 2017
    arXiv | CPL | IEEE Xplore
    DOI:10.1109/TIT.2017.2689783

  3. M. Ivanov, C. Häger, F. Brännström, A. Graell i Amat, A. Alvarado, E. Agrell, “On the Information Loss of the Max-Log Approximation in BICM Systems, IEEE Trans. Inf. Theory, vol. 62, no. 6, pp. 3011-3025, June 2016
    arXiv | CPL | IEEE Xplore
    DOI: 10.1109/TIT.2016.2543740

  4. C. Häger, A. Graell i Amat, F. Brännström, A. Alvarado, E. Agrell, “Terminated and Tailbiting Spatially Coupled Codes with Optimized Bit Mappings for Spectrally Efficient Fiber-Optical Systems (invited paper), J. Lightw. Technol., vol. 33, no. 7, pp. 1275-1285, April 2015
    arXiv | CPL | IEEE Xplore
    DOI: 10.1109/JLT.2015.2390596

  5. C. Häger, A. Graell i Amat, F. Brännström, A. Alvarado, E. Agrell, “Improving Soft FEC Performance for Higher-Order Modulations via Optimized Bit Channel Mappings, Optics Express, vol. 22, no. 12, pp. 14544-14558, June 2014
    arXiv | CPL | OSA
    DOI: 10.1364/OE.22.014544

  6. C. Häger, L. Beygi, E. Agrell, P. Johannisson, M. Karlsson, A. Graell i Amat, “A Low-Complexity Detector for Memoryless Polarization-Multiplexed Fiber-Optical Channels, IEEE Commun. Lett., vol. 18, no. 2, pp. 368-371, Jan. 2014
    arXiv | CPL | IEEE Xplore
    DOI: 10.1109/LCOMM.2013.122713.132200

  7. C. Häger, A. Graell i Amat, A. Alvarado, E. Agrell, “Design of APSK Constellations for Coherent Optical Channels with Nonlinear Phase Noise, IEEE Trans. Commun., vol. 61, no. 8, pp. 3362-3373, Aug. 2013
    arXiv | CPL | IEEE Xplore
    DOI: 10.1109/TCOMM.2013.061913.120713

conference

  1. M. Lian, C. Häger, H. D. Pfister, “What Can Machine Learning Teach Us about Communications, in Proc. Information Theory Workshop (ITW), Guangzhou, China, 2018
    arXiv | CPL

  2. A. Sheikh, A. Graell i Amat, G. Liva, C. Häger, H. D. Pfister, “On Low-Complexity Decoding of Product Codes for High-Throughput Fiber-Optic Systems, in Proc. Int. Symp. Turbo Codes and Iterative Information Processing (ISTC), Hong Kong, 2018
    arXiv | CPL

  3. C. Häger and H. D. Pfister, “Wideband Time-Domain Digital Backpropagation via Subband Processing and Deep learning”, in Proc. European Conf. Optical Communication (ECOC), Rome, Italy, 2018
    Slides | arXiv | CPL

  4. C. Fougstedt, C. Häger, L. Svensson, H. D. Pfister, P. Larsson-Edefors, “ASIC Implementation of Time-Domain Digital Backpropagation with Deep-Learned Chromatic Dispersion Filters, in Proc. European Conf. Optical Communication (ECOC), Rome, Italy, 2018
    arXiv | CPL

  5. S. Li, C. Häger, N. Garcia, H. Wymeersch, “Achievable Information Rates for Nonlinear Fiber Communication via End-to-end Autoencoder Learning, in Proc. European Conf. Optical Communication (ECOC), Rome, Italy, 2018
    Github link: github.com/henkwymeersch/AutoencoderFiber
    arXiv | CPL

  6. C. Häger and H. D. Pfister, “Deep Learning of the Nonlinear Schrödinger Equation in Fiber-Optic Communications, in Proc. IEEE Int. Symp. on Information Theory (ISIT), Vail, Colorado, USA, June 2018
    Slides | arXiv | CPL | IEEE Xplore
    DOI: 10.1109/ISIT.2018.8437734

  7. E. Santi, C. Häger, H. D. Pfister, “Decoding Reed-Muller Codes Using Minimum-Weight Parity Checks, in Proc. IEEE Int. Symp. on Information Theory (ISIT), Vail, Colorado, USA, June 2018
    arXiv | CPL | IEEE Xplore
    DOI: 10.1109/ISIT.2018.8437637

  8. C. Häger and H. D. Pfister, “Nonlinear Interference Mitigation via Deep Neural Networks, Optical Fiber Communication Conf. and Exposition (OFC), San Diego, CA, March 2018
    Slides | arXiv | CPL | OSA
    DOI: 10.1364/OFC.2018.W3A.4

  9. C. Häger and H. D. Pfister, “Miscorrection-free Decoding of Staircase Codes, in Proc. European Conf. Optical Communication (ECOC), Gothenburg, Sweden, September 2017
    Poster | arXiv | CPL | IEEE Xplore
    DOI: 10.1109/ECOC.2017.8345919

  10. C. Häger, A. Graell i Amat, H. D. Pfister, F. Brännström, “Density Evolution for Deterministic Generalized Product Codes with Higher-Order Modulation, (invited paper) in Proc. Int. Symp. on Turbo Codes and Iterative Information Processing (ISTC), Brest, France, September 2016
    Slides | arXiv | CPL | IEEE Xplore
    DOI: 10.1109/ISTC.2016.7593112

  11. C. Häger, H. D. Pfister, A. Graell i Amat, F. Brännström, “Deterministic and Ensemble-Based Spatially-Coupled Product Codes, in Proc. IEEE Int. Symp. on Information Theory (ISIT), Barcelona, Spain, July 2016
    Github link: www.github.com/chaeger/DensE
    Slides | arXiv | CPL | IEEE Xplore
    DOI: 10.1109/ISIT.2016.7541672

  12. C. Häger, H. D. Pfister, A. Graell i Amat, F. Brännström, Erik Agrell, “A Deterministic Construction and Density Evolution Analysis for Generalized Product Codes, (invited paper) in Proc. Int. Zurich Seminar on Communications (IZS), Zürich, Switzerland, March 2016
    Github link: www.github.com/chaeger/DensE
    Slides | CPL | ETH
    DOI: 10.3929/ethz-a-010602015

  13. C. Häger, H. D. Pfister, A. Graell i Amat, F. Brännström, “Density Evolution and Error Floor Analysis for Staircase and Braided Codes, in Proc. Optical Fiber Communication Conf. and Exposition (OFC), Anaheim, CA, March 2016
    Github link: www.github.com/chaeger/DensE
    Poster | CPL | OSA
    DOI: 10.1364/OFC.2016.Th2A.42

  14. A. Graell i Amat, C. Häger, F. Brännström, E. Agrell, “Spatially-Coupled Codes for Optical Communications: State-of-the-Art and Open Problems, (invited paper) in Proc. Optoelectronics and Communications Conf. (OECC), Shanghai, China, June 2015
    Slides | CPL | IEEE Xplore
    DOI: 10.1109/OECC.2015.7340116

  15. C. Häger, A. Graell i Amat, Henry D. Pfister, A. Alvarado, F. Brännström, E. Agrell, “On Parameter Optimization for Staircase Codes, in Proc. Optical Fiber Communication Conf. and Exposition (OFC), Los Angeles, CA, March 2015
    Slides | CPL | IEEE Xplore | OSA
    DOI: 10.1364/OFC.2015.Th3E.3

  16. C. Häger, A. Graell i Amat, F. Brännström, A. Alvarado, E. Agrell, “Comparison of Terminated and Tailbiting Spatially Coupled LDPC Codes With Optimized Bit Mapping for PM-64-QAM, in Proc. European Conf. Optical Communication (ECOC), Cannes, France, Sep. 2014
    Slides | CPL | IEEE Xplore
    DOI: 10.1109/ECOC.2014.6964047

  17. C. Häger, A. Graell i Amat, A. Alvarado, F. Brännström, E. Agrell, “Optimized Bit Mappings for Spatially Coupled LDPC Codes over Parallel Binary Erasure Channels, in Proc. IEEE Int. Conf. Communications (ICC), Sydney, Australia, June 2014
    Slides (Adobe Reader required) | arXiv | CPL | IEEE Xplore
    DOI: 10.1109/ICC.2014.6883627

  18. C. Häger, A. Graell i Amat, A. Alvarado, E. Agrell, “Constellation Optimization for Coherent Optical Channels Distorted by Nonlinear Phase Noise, in Proc. IEEE Global Communications Conf. (GLOBECOM), Anaheim, CA, Dec. 2012
    Slides | CPL | IEEE Xplore
    DOI: 10.1109/GLOCOM.2012.6503552

invited talks

other presentations

other posters

thesis and reports

notes