Picture of Laurent Schmalen

Laurent Schmalen

Stuttgart, Germany

Education

  • Dr.-Ing. (PhD) degree from RWTH Aachen University in 2011 (Iterative Source-Channel Decoding: Design and Optimization for Heterogeneous Networks)
  • Dipl.-Ing. degree from RWTH Aachen University in 2005

Biography

Laurent Schmalen is a member of technical staff in Bell Labs’ high-speed systems, signals and processing group within the IP transport program, at Nokia Bell Labs. Dr. Schmalen received both his Dipl.-Ing. degree in electrical engineering and information technology and his Dr.-Ing. degree from the RWTH Aachen University of Technology, Germany in 2005 and 2011, respectively. His research interests include forward error correction, modulation formats and information theory for future optical networks as well as joint source-channel coding. He is a two-time recipient of the Friedrich-Wilhelm award, and received the E-Plus award for his Ph.D. thesis. He furthermore received the best paper award of the 2010 ITG Speech Communication Conference, the 2013 best student paper award at the IEEE Signal Processing Systems (SiPS) workshop and the 2014 IEEE Transactions on Communications Exemplary Reviewer Award. Since 2014, Dr. Schmalen also serves as guest lecturer at the University of Stuttgart.

Research Interests

  • Coding Theory
  • Communications Paradigms
  • Optical Communication

Honors and Awards

  • Exemplary Reviewer of the IEEE Transactions on Communications
  • Bell Labs President's Award as member of the 400G Photonic Service Engine Core Team
  • Best student paper award at the IEEE Signal Processing Systems (SiPS) workshop in Taipei, Taiwan (Oct. 2013)
  • Friedrich-Wilhelm award for scientific achievements in the PhD thesis (Nov. 2012)
  • E-Plus award for an outstanding PhD thesis in the field of telecommunications (Dec. 2011)
  • Best paper award at the 9th ITG Conference on Speech Communication, Bochum, Germany (Oct. 2010)
  • Friedrich-Wilhelm award for outstanding scientific work in the master’s thesis (Dec. 2006)
  • Aachen VDE award for outstanding course achievements (Jan. 2002)

Selected Articles and Publications

Journal Papers

  • L. Schmalen, A. Alvarado and R. Rios-Müller, “Performance Prediction of Nonbinary Forward Error Correction in
    Optical Transmission Experiments”, accepted for publication at IEEE/OSA Journal of Lightwave Technology,
    vol. 35, no. 3, Feb. 2017, preprint available at arXiv:1606.00755v2
  • A. Ghazisaeidi, I. Fernandez, L. Schmalen, P. Tran, C. Simonneau, E. Awwad, B. Uscumlic, P. Brindel, and
    G. Charlet, “Submarine Transmission Systems Using Digital Nonlinear Compensation and Adaptive-Rate Forward
    Error Correction”, IEEE/OSA Journal on Lightwave Technology, vol. 34, no. 8, pp. 1886-1895, Apr. 2016
  • F. Buchali, F. Steiner, G. Böcherer, L. Schmalen, P. Schulte and W. Idler, "Rate Adaptation and Reach Increase by Probabilistically Shaped 64-QAM: An Experimental Demonstration," to be published in IEEE/OSA Journal on Lightwave Technology, 2016
  • A. Ghazisaeidi, I. Fernandez, L. Schmalen, P. Tran, C. Simmonneau, E. Awwad, B. Uscumlic, P. Brindel and G. Charlet, "Submarine Transmission Systems Using Digital Nonlinear Compensation and Adaptive-Rate Forward Error Correction, to be published in IEEE/OSA Journal on Lightwave Technology, 2016
  • C. Pan, H. Bülow, L. Schmalen, W. Idler, and F. R. Kschischang, “Optical Nonlinear-Phase-Noise Compensation for 32 Gbaud PolDM-16 QAM Transmission Using a Code-Aided Expectation-Maximization Algorithm,” IEEE/OSA Journal on Lightwave Technology, vol. 33, no. 17, pp. 3679-3686, Sep. 2015
  • A. Ghazisaeidi, L. Schmalen, I. Fernandez, C. Simmoneau, P. Tran, P. Brindel, and G. Charlet, “Transoceanic Transmission Systems Using Adaptive Multi-Rate FECs,” IEEE/OSA Journal on Lightwave Technology, vol. 33, no. 7, pp. 1479-1487, Apr. 2015
  • J. Renaudier, R. Rios-Müller, P. Tran, L. Schmalen, and G. Charlet, „Spectrally Efficient 1-Tb/s Transceivers for Long-haul Optical Systems,” IEEE/OSA Journal on Lightwave Technology, vol. 33, no. 7, pp. 1452-1458, Apr. 2015
  • R. Rios-Müller, J. Renaudier, P. Brindel, A. Ghazisaeidi, I. Fernandez, P. Tran, C. Simmoneau, L. Schmalen and G. Charlet, ”Spectrally Efficient 400-Gb/s Single Carrier Transport over 7200 km,” IEEE/OSA Journal on Lightwave Technology, vol. 33, no. 7, pp. 1402-1407, Apr. 2015
  • L. Schmalen, “A Low-Complexity LDPC Coding Scheme for Channels with Phase Slips,” IEEE/OSA Journal on Lightwave Technology, vol. 33, no. 7, pp. 1319-1325, Apr. 2015
  • L. Schmalen, V. Aref, J. Cho, D. Suikat, D. Rösener, and A. Leven, “Spatially Coupled Soft-Decision Forward Error Correction for Future Lightwave Systems,” IEEE/OSA Journal on Lightwave Technology, vol. 33, no. 5, pp. 1109-1116, Mar. 2015
  • M. Beermann, E. Monzó, L. Schmalen, and P. Vary, “GPU Accelerated Belief Propagation Decoding of Non-Binary LDPC Codes with Parallel and Sequential Scheduling,” Springer Journal on Signal Processing Systems, vol. 78, no. 1, pp. 21-34, Jan. 2015
  • A. Leven and L. Schmalen, “Status and Recent Advances on Forward Error Correction Technologies for Lightwave Systems,” IEEE/OSA Journal on Lightwave Technology, vol. 32, no. 16, pp. 2735-2750, Aug. 2014
  • L. Schmalen, A. J. de Lind van Wijngaarden, and S. ten Brink, “Forward Error Correction in Optical Core and Access Networks, Bell Labs Technical Journal, vol. 18, no. 3, pp. 39-66, Dec. 2013, DOI: 10.1002/bltj.21627
  • L. Schmalen, F. Buchali, A. Leven, and S. ten Brink, “A Generic Tool for Assessing the Soft-FEC Performance in Optical Transmission Experiments”, IEEE Photonics Technology Letters, vol. 24, no. 1, pp. 40-42, Jan. 2012
  • L. Schmalen and P. Vary, “Iterative Source-Channel Decoding with Reduced Error Floors,” IEEE Journal on Selected Topics in Signal Processing, vol. 5, no. 8, pp. 1577-1587, Dec. 2011
  • A. Leven, F. Vacondio, L. Schmalen, S. ten Brink, and W. Idler, “Estimation of Soft FEC Performance in Optical Transmission Experiments”, IEEE Photonics Technology Letters, vol. 23, no. 20, pp. 1547-1549, Oct. 2011
  • L. Schmalen, M. Adrat, T. Clevorn, and P. Vary, “EXIT-Chart Based System Design For Iterative Source-Channel Decoding with Fixed-Length Codes,” IEEE Transactions on Communications, vol. 59, no. 9, pp. 2406-2413, Sep. 2011
  • T. Clevorn, L. Schmalen, P. Vary, and M. Adrat: “On Redundant Index Assignments for Iterative Source-Channel Decoding,” in IEEE Communications Letters, vol. 12, pp. 514–516, Jul. 2008

Conference Papers 

  • L. Zhang and L. Schmalen, “Feed-Forward Staircase Codes,” accepted for publication at the International ITG
    Conference on Systems, Communications and Coding (SCC), Hamburg, Germany, Feb. 2017, preprint available at
    arXiv:1604.06574v2
  • S. Cammerer, L. Schmalen, V. Aref and S. ten Brink, “Wave-like Decoding of Tail-biting Spatially Coupled LDPC
    Codes Through Iterative Demapping”, International Symposium on Turbo Codes & Iterative Information Processing
    (ISTC), Brest, France, Sep. 2016
  • V. Aref, N. Rengaswamy and L. Schmalen, “Spatially Coupled LDPC Codes Affected by a Single Random Burst of
    Erasures”, International Symposium on Turbo Codes & Iterative Information Processing (ISTC), Brest, France,
    Sep. 2016
  • A. Ghazisaeidi, I. Fernandez de Jaregui Ruiz, R. Rios-Müller, L. Schmalen, P. Tran, P. Brindel, A. Carbo Meseguer,
    Q. Hu, F. Buchali, G. Charlet and J. Renaudier, “65Tb/s Transoceanic Transmission Using Probabilistically-Shaped
    PDM-64QAM,” European Conference on Optical Communications (ECOC), Düsseldorf, Germany, Sep. 2016
  • W. Idler, F. Buchali, L. Schmalen, E. Lach, R.-P. Braun, G. Böcherer, P. Schulte and F. Steiner, “Field
    Demonstration of 1 Tbit/s Super-Channel Network Using Probabilistically Shaped Constellations”, European
    Conference on Optical Communications (ECOC), Düsseldorf, Germany, Sep. 2016
  • L. Schmalen and F. Buchali, “Implicit Constellation Shaping in Regenerative Optical Networks”, European
    Conference on Optical Communications (ECOC), Düsseldorf, Germany, Sep. 2016
  • L. Schmalen, D. Suikat, V. Aref and D. Rösener, “On the Design of Capacity-Approaching Unit-Memory Spatially
    Coupled LDPC Codes for Optical Communications”, European Conference on Optical Communications (ECOC),
    Düsseldorf, Germany, Sep. 2016
  • Q. Hu, F. Buchali, L. Schmalen, W. Idler, R. Dischler and H. Bülow, “Improved Flexibility in Rate and Reach by
    Time-Frequency Packed QPSK”, European Conference on Optical Communications (ECOC), Düsseldorf, Germany,
    Sep. 2016
  • R. Dischler, F. Buchali and L. Schmalen, “Embedded In-Band DQPSK Signaling within n-QAM Data Transmission”,
    European Conference on Optical Communications (ECOC), Düsseldorf, Germany, Sep. 2016
  • F. Buchali, W. Idler, K. Schuh, L. Schmalen, G. Böcherer, F. Steiner, P. Schulte and T. A. Eriksson, “Study of
    Electrical Subband Multiplexing at 54 GHz Modulation Bandwidth for 16QAM and Probabilistically Shaped
    64QAM”, European Conference on Optical Communications (ECOC), Düsseldorf, Germany, Sep. 2016
  • F. Buchali, W. Idler, L. Schmalen, G. Böcherer, P. Schulte and F. Steiner, “Probabilistically Shaped QAM for
    Independent Reach, Spectral Efficiency and Bit-rate Adaptation”, European Conference on Optical Communications
    (ECOC), Düsseldorf, Germany, Sep. 2016
  • S. Cammerer, V. Aref, L. Schmalen, and S. ten Brink, "Triggering Wave-Like Convergence of Tail-biting Spatially Coupled LDPC Codes," Annual Conference on Information Science and Systems (CISS), Princeton, NJ, USA, March 2016
  • N. Rengaswamy, L. Schmalen, and V. Aref, "On the Burst Erasure Correctability of Spatially Coupled LDPC Ensembles," International Zurich Seminar on Communications, Zurich, CH, March 2016
  • L. Schmalen, A. Alvarado and R. Rios-Müller, "Predicting the Performance of Nonbinary Forward Error Correction in Optical Transmission Experiments," Optical Fiber Communication Conference (OFC), Anaheim, CA, USA, March 2016
  • R. Rios-Müller, J. Renaudier, L. Schmalen and G. Charlet, "Practical Approaches to 400G Single-Carrier Submarine Transmission," Optical Fiber Communication Conference (OFC), Anaheim, CA, USA, March 2016
  • L. Schmalen, D. Suikat, D. Rösener, and V. Aref, “Next-Generation Forward Error Correction: Can We Close the Gap to the Shannon Limit?,” Asia Communications and Photonics Conference (ACP), Hong Kong, Nov. 2015
  • L. Schmalen, “Novel Forward Error Correction Concepts for Coherent Optical Communications,” IEEE Photonics Conference (IPC), Reston, VA, USA, Oct. 2015
  • F. Buchali, G. Böcherer, W. Idler, L. Schmalen, P. Schulte, and F. Steiner, “Experimental Demonstration of Capacity Increase and Rate-Adaptation by Probabilistically Shaped 64-QAM,“ European Conference on Optical Communications (ECOC), Paper PDP3.4, Valencia, Spain, Sep. 2015
  • F. Buchali, L. Schmalen, Q. Hu, and D. Che, “Low Latency Digital Regenerator for Dual Polarization QAM Signals,” European Conference on Optical Communications (ECOC), Paper Mo.3.3.5, Valencia, Spain, Sep. 2015
  • R. Rios-Müller, J. Renaudier, L. Schmalen, and G. Charlet, “Experimental Comparison between Sub-band Single-Carrier and Superchannel for 400 Gb/s and 800 Gb/s Transport,“ European Conference on Optical Communications (ECOC), Paper Tu.1.4.4, Valencia, Spain, Sep. 2015
  • A. Ghazisaeidi, L. Schmalen, P. Tran, C. Simmoneau, E. Awwad, B. Uscumlic, P. Brindel, and G. Charlet, “54.2 Tb/s Transoceanic Transmission Using Ultra Low Loss Fiber, Multi-rate FEC and Digital Nonlinear Mitigation,” European Conference on Optical Communications (ECOC), Paper Th.2.2.3, Valencia, Spain, Sep. 2015
  • L. Schmalen, D. Suikat, D. Rösener, V. Aref, A. Leven, and S. ten Brink, “Spatially Coupled Codes and Optical Fiber Communications: An Ideal Match?”, IEEE Workshop on Signal Processing Advances in Wireless Communications (SPAWC), Special Session on Signal Processing, Coding, and Information Theory for Optical Communications, Stockholm, Sweden, Jun. 2015
  • J. Cho and L. Schmalen, “Construction of Protographs for Large-Girth Structured LDPC Convolutional Codes”, International Conference on Communications (ICC), London, UK, Jun. 2015
  • R. Rios-Müller, J. Renaudier, P. Brindel, H. Mardoyan, P. Jennevé, L. Schmalen, and G. Charlet, “1-Terabit/s Net Data-Rate Transceiver Based on Single-Carrier Nyquist-Shaped 124 GBaud PDM-32QAM,” Optical Fiber Communications Conference (OFC), Los Angeles, CA, USA, Paper Th5B.1, Mar. 2015
  • J. Renaudier, R. Rios-Müller, L. Schmalen, and G. Charlet, “Spectrally Efficient 1 Tb/s Transceivers,” Optical Fiber Communications Conference (OFC), Los Angeles, CA, USA, Paper M2G.3, Mar. 2015
  • H. Mardoyan, R. Rios-Müller, M. A. Mestre, P. Jennevé, L. Schmalen, A. Ghazisaeidi, P. Tran, S. Bigo, and J. Renaudier, “Transmission of Single-Carrier Nyquist-Shaped 1-Tb/s Line-Rate Signal over 3,000km,” Optical Fiber Communications Conference (OFC), Los Angeles, CA, USA, Paper W3G.2, Mar. 2015
  • L. Schmalen, S. ten Brink, and A. Leven, “Spatially Coupled LDPC Protograph Codes for Universal Phase Slip-Tolerant Differential Decoding,” Optical Fiber Communications Conference (OFC), Los Angeles, CA, USA, Paper Th3E.6, Mar. 2015
  • F. Buchali, W. Idler, L. Schmalen, K. Schuh, and H. Bülow, “Performance and Advantages of 100 Gb/s QPSK/8QAM Hybrid Modulation Formats,” Optical Fiber Communications Conference (OFC), Los Angeles, CA, USA, Paper Th2A.16, Mar. 2015
  • R. Rios-Müller, J. Renaudier, L. Schmalen, and G. Charlet, “Joint Coding Rate and Modulation Format Optimization for 8QAM Constellations Using BICM Mutual Information,” Optical Fiber Communications Conference (OFC), Los Angeles, CA, USA, Paper W3K.4, Mar. 2015
  • A. Ghazisaeidi, L. Schmalen, I. Fernandez de Jauregui, P. Tran, C. Simonneau, P. Brindel, and G. Charlet, “52.9 Tb/s Transmission over Transoceanic Distances using Adaptive Multi-Rate FEC,” European Conference on Optical Communications (ECOC), Cannes, France, Paper PD.3.4, Sep. 2014
  • R. Rios-Müller, J. Renaudier, P. Brindel, C. Simonneau, P. Tran, A. Ghazisaeidi, I. Fernandez, L. Schmalen, and G. Charlet, “Optimized Spectrally Efficient Transceiver for 400-Gb/s Single Carrier Transport,” European Conference on Optical Communications (ECOC), Cannes, France, Paper PD.4.2, Sep. 2014
  • L. Schmalen, V. Aref, J. Cho and K. Mahdaviani, “Next Generation Error Correcting Codes for Lightwave Systems”, European Conference on Optical Communications (ECOC), Cannes, France, Paper Th.1.3.3, Sep. 2014
  • L. Schmalen, “Low-Complexity Phase Slip Tolerant LDPC-based FEC Scheme,” European Conference on Optical Communications (ECOC), Cannes, France, Paper Th.2.3.2, Sep. 2014
  • L. Schmalen, D. Suikat, D. Rösener, and A. Leven, „Evaluation of Left-Terminated Spatially Coupled Codes for Optical Communications,“ European Conference on Optical Communications (ECOC), Cannes, France, Paper Th.2.3.4, Sep. 2014
  • C. R. Müller, A. Leven, H. Bülow, L. Schmalen, G. Leuchs and C. Marquardt, „M-ary Phase Shift Keying Receiver Beating the Standard Quantum Limit for any Signal Power,” European Conference on Optical Communications (ECOC), Cannes, France, Paper P.8.3, Sep. 2014
  • F. Buchali, L. Schmalen, K. Schuh and W. Idler, „ Optimization of Time-Division Hybrid-Modulation and its Application to Rate Adaptive 200Gb Transmission,” European Conference on Optical Communications (ECOC), Cannes, France, Paper Tu.4.3.1, Sep. 2014
  • J. Renaudier, R. Rios-Müller, L. Schmalen, P. Tran, P. Brindel and G. Charlet, „ 1-Tb/s PDM-32QAM Superchannel Transmission at 6.7-b/s/Hz over SSMF and 150-GHz-Grid ROADMs,” European Conference on Optical Communications (ECOC), Cannes, France, Paper Tu.3.3.4, Sep. 2014
  • L. Schmalen and K. Mahdaviani, “Laterally Connected Spatially Coupled Code Chains for Transmission over Unstable Parallel Channels,” International Symposium on Turbo Codes & Iterative Information Processing, Bremen, Germany, Aug. 2014
  • L. Schmalen, “Energy Efficient FEC for Optical Transmission Systems”, Optical Fiber Communications Conference (OFC), San Francisco, CA, USA, Mar. 2014, Paper M3A.1
  • F. Buchali, L. Schmalen, A. Klekamp, K. Schuh, and A. Leven, „5 x 50Gb/s WDM Transmission of 32GBaud DP‑3‑PSK over 36,000 km Fiber with Spatially Coupled LDPC Coding,” accepted for publication at Optical Fiber Communications Conference (OFC), San Francisco, CA, USA, Mar. 2014, Paper, W1A.1
  • F. Buchali, A. Klekamp, L. Schmalen, and T. Drenski, „Implementation of 64QAM at 42.66 GBaud Using 1.5 Samples per Symbol DAC and Demonstration of up to 300 km Fiber Transmission,” accepted for publication at Optical Fiber Communications Conference (OFC), San Francisco, CA, USA, Mar. 2014, Paper M2A.1
  • H. Bülow, X. Lu, L. Schmalen, A. Klekamp, and F. Buchali, „ Experimental Performance of 4D Optimized Constellation Alternatives for PM-8QAM and PM-16QAM,” accepted for publication at Optical Fiber Communications Conference (OFC), San Francisco, CA, USA, Mar. 2014, Paper M2A.6
  • H. Bülow, X. Lu, and L. Schmalen, “Experimental Analysis of Transmission and Soft Decoding of Optimized 4D Constellations”, Asia Communications and Photonics Conference (ACP), Beijing, China, Nov. 2013
  • V. Aref, L. Schmalen, and S. ten Brink, “On the Convergence Speed of Spatially Coupled LDPC Ensembles”, Allerton Conference on Communications, Control, and Computing, Monticello, IL, USA, Oct. 2013, arXiv:1307.3780
  • M.. Beermann, E. Monzó, L. Schmalen, and P. Vary, “High Speed Decoding of Non-Binary Irregular LDPC Codes Using GPUs,” IEEE Workshop on Signal Processing Systems (SiPS), Taipei, Taiwan, Oct. 2013
  • H. Bülow, X. Lu, and L. Schmalen, “Experimental Analysis of Single Carrier POLQAM (6Pol-QPSK) Transmission with Soft-Decoding,” European Conference on Optical Communications (ECOC), London, UK, Sep. 2013
  • R. Dischler and L. Schmalen, “Transmission of a 1.1 Tb/s Super Channel in 100 GHz Optical Bandwidth Based on PM-256 QAM and Spatially Coupled FEC,” European Conference on Optical Communications (ECOC), London, UK, Sep. 2013
  • A. Leven and L. Schmalen, “Status and Recent Advances on Forward Error Correction Technologies for Lightwave Systems”, European Conference on Optical Communications (ECOC), London, UK, Sep. 2013
  • J. Renaudier, R. Rios-Muller, L. Schmalen, M. Salsi, P. Tran, G. Charlet, and S. Bigo, „1-Tb/s Transceiver Spanning over just Three 50-GHz Frequency Slots for Long-Haul Systems”, Paper PD2.D.5, European Conference on Optical Communications (ECOC), London, UK, Sep. 2013
  • M. Salsi, R. Rios-Muller, J. Renaudier, P. Tran, L. Schmalen, A. Ghazisaeidi, H. Mardoyan, P. Brindel, G. Charlet, and S. Bigo, „38.75 Tb/s Transmission Experiment over Transoceanic Distance,” Paper PD2.E.2, European Conference on Optical Communications (ECOC), London, UK, Sep. 2013
  • M. Salsi, A. Ghazisaeidi, P. Tran, R. Rios Muller, L. Schmalen, J. Renaudier, H. Mardoyan, P. Brindel, G. Charlet, and S. Bigo, “31 Tb/s Transmission over 7,200km using 46GBaud PDM-8QAM with Optimized Error Correcting Code Rate,” Optoelectronics and Communications Conference (OECC), Paper PDP3-5, Kyoto, Japan, Jul. 2013
  • F. Buchali, K. Schuh, L. Schmalen, W. Idler, E. Lach, and A. Leven, “1-Tbit/s dual-carrier DP 64QAM transmission at 64Gbaud with 40% overhead soft-FEC over 320km SSMF, Optical Fiber Communications Conference (OFC), Anaheim, CA, USA, Mar. 2013
  • L. Schmalen and S. ten Brink, “Combining Spatially Coupled Codes with Modulation and Detection”, International ITG Conference on Systems, Communications and Coding (SCC), Munich, Germany, Jan. 2013
  • L. Schmalen, M. Adrat, T. Clevorn, and P. Vary, “Windowed Iterative Source-Channel Decoding with Delay Constraints”, International Symposium on Turbo Codes & Iterative Information Processing, Gothenburg, Sweden, Aug. 2012
  • L. Schmalen, S. ten Brink, and A. Leven, “Analysis and Optimization of Iteration Schedules for LDPC Coded Modulation and Detection”, International Symposium on Turbo Codes & Iterative Information Processing, Gothenburg, Sweden, Aug. 2012
  • L. Schmalen, G. Lechner, S. ten Brink, and A. Leven, “On Threshold Prediction of Low-Density Parity-Check Codes With Structure”, Conference on Information Sciences and Systems (CISS), Princeton, NJ, USA, Mar. 2012
  • F. Buchali, K. Schuh, D. Rösener, E. Lach, R. Dischler, W. Idler, L. Schmalen, A. Leven, R.-P. Braun, A. Erhardt, C. Gerlach, L. Schürer, “512 Gb/s DP-16-QAM Field Trial over 734 km Installed SSMF with Co-Propagating 10 Gb/s NRZ Neighbors Incorporating Soft-FEC Decoding,” Optical Fiber Communications Conference (OFC), Los Angeles, CA, USA, Mar. 2012
  • L. Schmalen and R. Dischler, “Experiments Evaluation of Coded Modulation for a Coherent PDM System with High Spectral Efficiency,” OFC/NFOEC, Los Angeles, CA, USA, Mar. 2012
  • Y. Chen, L. Schmalen, H, Bülow, A. Leven, and S. ten Brink, “Space-Time Coding Schemes for Optical MIMO”, European Conference on Optical Communications (ECOC), Paper Tu.6.A.1, Geneva, CH, Sep. 2011
  • L. Schmalen, M. Tschauner, T. Breddermann, and P. Vary, “Novel Iterative Multiple Description Coding for Correlated Sources”, European Signal Processing Conference (EUSIPCO), Barcelona, Spain, Aug. 2011
  • M. Beermann, L. Schmalen, and P. Vary, “Improved Decoding of Binary and Non-Binary LDPC by Probabilistic Shuffled Belief Propagation,” IEEE International Conference on Communications (ICC), Kyoto, Japan, Jun. 2011
  • L.  Schmalen and P. Vary, “Reconstruction of Multiple Descriptions by MMSE Estimation,” in ITG Conference Speech Communication, Bochum, Germany, Oct. 2010
  • L. Schmalen, P. Vary, T. Clevorn, and M Adrat, “Turbo Source Compression with Jointly Optimized Inner Irregular and Outer Irregular Codes,” in IEEE Vehicular Technology Conference (VTC-Fall), Ottawa, Canada, Sep. 2010
  • T. Clevorn, L. Schmalen, P. Vary, and M. Adrat, “Hybrid ARQ with Incremental Redundant Index Assignments for Iterative Source-Channel Decoding,” in IEEE International Conference on Communications (ICC), Cape Town, South Africa, May 2010
  • M. Adrat, M. Antweiler, L. Schmalen, P. Vary, and T. Clevorn, “On the Overshooting Effect in EXIT Charts of Iterative Source-Channel Decoding,” in IEEE International Conference on Communications (ICC), Cape Town, South Africa, May 2010
  • L. Schmalen and P. Vary, “Error Resilient Turbo Compression of Source Codec Parameters Using Inner Irregular Codes,” in International ITG Conference on Source and Channel Coding, Siegen, Germany, Jan. 2010
  • L. Schmalen, T. Schlien, and P. Vary, “The FlexCode Source-Channel Coding Approach for Audio and Speech Transmission,” in International ITG Conference on Source and Channel Coding, Siegen, Germany, Jan. 2010
  • L. Schmalen and P. Vary, “Near-Lossless Compression and Protection by Turbo Source-Channel (De-) Coding Using Irregular Index Assignments,” in IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP), Taipei, Taiwan, Apr. 2009
  • H. Lüders, B. Eschbach, L. Schmalen, and P. Vary, “OFDM Turbo DeCodulation with EXIT Optimized Bit Loading and Signal Constellations,” in IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP), Taipei, Taiwan, Apr. 2009
  • L. Schmalen, P. Vary, and M. Adrat, “Reduced-Search Source Decoders for Iterative Source-Channel Decoding,” in ITG Conference on Speech Communication, Aachen, Germany, Oct. 2008
  • L. Schmalen, B. Schotsch, M. Jeub, P. Vary, and T. Clevorn, “The FlexCode Channel Coding Approach,” in ITG Conference on Speech Communication, Aachen, Germany, Oct. 2008
  • T. Clevorn, L. Schmalen, P. Vary, and M. Adrat, “Iterative Source-Channel Decoding: Design of Redundant Index Assignments,” in ITG Conference on Speech Communication, Aachen, Germany, Oct. 2008
  • L. Schmalen, P. Vary, M. Adrat, and T. Clevorn, “Complexity-Reduced Iterative Source-Channel Decoding by Conditional Quantization,” in International Symposium on Turbo Codes & Related Topics, Lausanne, Switzerland, Sep. 2008
  • R. Thobaben, L. Schmalen, and P. Vary, “Joint Source-Channel Coding with Inner Irregular Codes,” in IEEE International Symposium on Information Theory (ISIT), Toronto, Canada, Jul. 2008
  • B. Schotsch, L. Schmalen, P. Vary, and T. Clevorn, “Graph-Based Turbo DeCodulation with LDPC Codes,” in Vehicular Technology Conference (VTC-Spring), Singapore, May 2008
  • L. Schmalen, P. Vary, T. Clevorn, and B. Schotsch, “Efficient Iterative Source-Channel Decoding Using Irregular Index Assignments,” in International ITG Conference on Source and Channel Coding, Ulm, Germany, Jan. 2008
  • H. Lüders, L. Schmalen, and P. Vary, “Approximating EXIT Characteristics of Soft Demodulators in OFDM BICM-ID Systems for Time Variant Frequency Selective Fading Channels,” in International ITG Conference on Source and Channel Coding, Ulm, Germany, Jan. 2008
  • L. Schmalen, P. Vary, M. Adrat, and T. Clevorn, “On the EXIT Characteristics of Feed Forward Convolutional Codes,” in IEEE International Symposium on Information Theory (ISIT), Nice, France, Jun. 2007
  • L. Schmalen, T. Clevorn, and P. Vary, “Iterative Source-Coded Equalization: Turbo Error Concealment for ISI Channels,” in IEEE Workshop on Signal Processing Advances in Wireless Communications (SPAWC), Helsinki, Finland, Jun. 2007
  • T. Clevorn, L. Schmalen, P. Vary, and M. Adrat, “On the Optimum Performance Theoretically Attainable for Scalarly Quantized Correlated Sources,” in International Symposium on Information Theory and its Applications (ISITA), Seoul, Korea, Oct. 2006
  • T. Clevorn, B. Schotsch, L. Schmalen, P. Vary, and M. Adrat, “Separation of Recursive Convolutional Codes into Sub-Codes using Galois Field Arithmetic,” in Conference on Information Sciences and Systems (CISS), Princeton, NJ, USA, Mar. 2006

 

 

 

 

 

 

 

Books and Chapters

  • L. Schmalen, S. ten Brink and A. Leven, "Advances in Detection and Error Correction for Coherent Optical Communications: Regular, Irregular and Spatially Coupled Code Designs," in Enabling Technologies for High-Spectral Efficiency Coherent Optical Communication Networks, by X. Zhou and C. Xie (editors), John Wiley & Sons, March 2016
  • A. Leven and L. Schmalen, "Implementation Aspects of Coherent Transmit and Receive Functions in Application-Specific Integrated Circuits," in Optical Fiber Telecommunications VIA, Ivan P. Kaminow, Tingye Li, and Alan E. Willner (editors), Academic Press, June 2013
  • M. Adrat, T. Clevorn, and L. Schmalen, "Iterative Source-Channel Decoding & Turbo DeCodulation," in Advances in Digital Speech Transmission, R. Martin, U. Heute, and C. Antweiler (editors), John Wiley & Sons, Ltd., January 2008