preprints

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

  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), (to be presented), Hong Kong, 2018
    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 | 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. 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
    arXiv

  2. 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

  3. 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

  4. 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 | IEEE Xplore
    DOI: 10.1109/ISIT.2018.8437734

  5. 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 | IEEE Xplore
    DOI: 10.1109/ISIT.2018.8437637

  6. 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

  7. 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

  8. 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

  9. 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

  10. 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

  11. 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

  12. 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

  13. 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

  14. 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

  15. 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

  16. 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