Publications


By Research Topic


  1. Signal Processing, Statistical Inference and Reinforcement Learning
  2. Communication Theory and Systems: Tackling Key Physical-Layer Problems
  3. Real-World Professional Design

Signal Processing, Statistical Inference, and Reinforcement Learning

Reinforcement Learning and Statistical Methods

  1. Seungyul Han and Youngchul Sung, "AMBER: Adaptive Multi-Batch Experience Replay for Continuous Action Control ," to be presented at the 2nd Workshop on Scaling Up Reinforcement Learning (SURL) in conjunction with the 28th International Joint Conference on Artificial Intelligence (IJCAI) 2019, Macao, China, Aug. 2019
  2. Seungyul Han and Youngchul Sung, "Dimension-Wise Importance Sampling Weight Clipping for Sample-Efficient Reinforcement Learning," the 36th International Conference on Machine Learning (ICML) 2019, Long Beach, CA, USA, Jun. 2019
  3. Woojun Kim, Myungsik Cho, and Youngchul Sung, "Message-dropout: An efficient training method for multi-agent deep reinforcement learning," the 33rd AAAI Conference on Artificial Intelligence (AAAI ) 2019, Honolulu, HW, USA, Jan. 2019

Signal Detection Theory

Detection of Correlated Random Processes: Large Deviations Analysis

  1. Yuni Lee and Youngchul Sung*, "Generalized Chernoff information for mismatched Bayesian detection and its application to energy detection," IEEE Signal Processing Letters, vol. 19, no. 11, pp. 753 - 756, Nov. 2012.
  2. Youngchul Sung*, H. Vincent Poor and Heejung Yu, "How much information can one get from a wireless ad hoc sensor network over a correlated random field?," IEEE Transactions on Information Theory, vol. 55, no. 6, pp. 2827 - 2847, Jun. 2009. Simple Condition for Theorem 2.
  3. Youngchul Sung, "Large deviations principle and its applications," in Proceedings of Korean Information and Communications Society (KICS), Coding and Information Theory Workshop, Jan. 2009.
  4. Youngchul Sung*, Xin Zhang, Lang Tong and H. Vincent Poor, "Sensor configuration and activation for field detection in large sensor arrays," IEEE Transactions on Signal Processing, vol. 56, no. 2, pp. 447 - 463, Feb. 2008.
  5. Youngchul Sung, Saswat Misra, Lang Tong*, and Anthony Ephremides, "Cooperative routing for signal detection in large sensor networks," IEEE Journal on Selected Areas in Communications, Vol. 25, no. 2, pp. 471 - 483, Feb. 2007.
  6. Youngchul Sung, Saswat Misra, Lang Tong*, and Anthony Ephremides, "Signal processing for application-specific ad-hoc networks," IEEE Signal Processing Magazine, vol. 23, no. 5, pp. 74 - 83, Sep. 2006.
  7. Youngchul Sung, Lang Tong*, and H. Vincent Poor, "Neyman-Pearson detection of Gauss-Markov signals in noise: Closed-form error exponent and properties," IEEE Transactions on Information Theory, vol. 52, no. 4, pp. 1354-1365, Apr. 2006.
  8. Youngchul Sung, Lang Tong, and H. Vincent Poor, "Optimal and suboptimal detection of Gaussian signals in noise: Asymptotic relative efficiency," in the proceeding of the Conference on Advanced Signal Processing Algorithms, Architectures, and Implementations XV, part of SPIE International Symposium, San Diego, CA, Jul. 2005.
  9. Youngchul Sung, Lang Tong, and H. Vincent Poor, "A large deviations approach to sensor scheduling for detection of correlated random fields," in Proc. of ICASSP 2005, Philadelphia, PA, Mar. 2005. (ICASSP 2005 Best Student Paper Award)

Detection under Parametric Model: Local Asymptotic Normality

  1. Yirang Lim, Juho Park and Youngchul Sung*, "Upper bound for the loss of energy detection of signals in multipath fading channels," IEEE Signal Processing Letters, vol. 16, no. 11, pp. 949 - 952, Nov. 2009.
  2. Youngchul Sung, Lang Tong*, and Ananthram Swami, "Asymptotic locally optimal detector for large scale sensor networks under the Poisson regime," IEEE Transactions on Signal Processing, vol. 53, no. 6, pp. 2005 - 2017, Jun. 2005.

Blind Channel Estimation

  1. Song Noh, Youngchul Sung*, and Michael Zoltowski, "A new precoder design for blind channel estimation for MIMO-OFDM systems," IEEE Transactions on Wireless Communications, vol. 13, no. 12, pp. 7011 - 7024, Dec. 2014
  2. Youngchul Sung*, Yirang Lim, Lang Tong and Alle-Jan van der Veen, "Signal processing advances for 3G CDMA: From rake receivers to blind techniques," IEEE Communications Magazine, vol. 47, no. 1, pp. 48 - 54, Jan. 2009
  3. Youngchul Sung, Lang Tong* and Ananthram Swami, "Blind channel estimation for space-time coded WCDMA," EURASIP Journal on Wireless Communications and Networking, vol. 2004, no. 2, pp. 322 - 334, Dec. 2004
  4. Youngchul Sung and Lang Tong*, "Tracking of fast-fading channels in long code WCDMA," IEEE Transactions on Signal Processing, vol. 52, no. 3, pp. 786 - 795, Mar. 2004
  5. Lang Tong*, Alle-Jan van der Veen, Patrick Dewilde and Youngchul Sung, "Blind decorrelating rake receiver for long code WCDMA," IEEE Transactions on Signal Processing, vol. 51, no. 6, pp. 1642 - 1655, Jun. 2003

Communication Theory and Systems

MIMO Communication

Downlink Scheduling for mmWave Massive MU-MIMO

  1. Junyeong Seo and Youngchul Sung*, "Beam design and user scheduling for non-orthogonal multiple access with multiple antennas based on Pareto-optimality," IEEE Transactions on Signal Processing, vol. 66, no. 11, pp. 2876 - 2891, Jun. 2018.
  2. Gilwon Lee and Youngchul Sung, "A new approach to user scheduling in massive multi-user MIMO broadcast channels," IEEE Transactions on Communications, vol. 66, no. 4, pp. 1481 – 1495, Apr. 2018
  3. Gilwon Lee and Youngchul Sung, "MAC scheduler for mmWave massive MIMO," in MmWave Massive MIMO: A Paradigm for 5G, edited by Shahid Mumtaz and Jonathan Rodriquez, Elsevier, Longdon, UK, Nov. 2016.
  4. Gilwon Lee, Youngchul Sung, and Marios Kountouris, "On the performance of random beamforming in sparse millimeter wave channels," IEEE Journal of Selected Topics in Signal Processing, vol. 10, no. 3, pp. 560 - 575, Apr. 2016.
  5. Gilwon Lee, Youngchul Sung, and Junyeong Seo, "Randomly-directional beamforming in mm-wave multi-user MISO downlink," IEEE Transactions on Wireless Communications, vol. 15, no. 2, pp. 1086 - 1100, Feb. 2016
  6. Gilwon Lee, Youngchul Sung, Jungho So, and Junyeong Seo, "Research trends in realizing massive MIMO for 5G (in Korean),” Special Issue on 5G and Beyond, The Magazine of the IEIE, Oct. 2015.
  7. Gilwon Lee, Youngchul Sung, and Marios Kountouris, "On the performance of randomly directional beamforming between line-of-sight and rich scattering channels,” Invited Paper to The Special Session of Signal Processing for Millimeter Wave Communication Systems in SPAWC 2015, Stockholm, Sweden, Jun. 2015.
  8. Gilwon Lee and Youngchul Sung*, "Asymptotically optimal simple user scheduling for massive MIMO downlink with two-stage beamforming," Proc. of SPAWC 2014, Toronto, CA, Jun. 2014.

Beamformer Design for Massive MIMO

  1. Junyeong Seo, Youngchul Sung*, and Hamid Jafarkhani, "A high-diversity transceiver design for MISO broadcast channels," IEEE Transactions on Wireless Communications, vol. 18, no. 5, pp. 2591 - 2606, May 2019
  2. Junyeong Seo and Youngchul Sung, "A new transceiver architecture for multi-user MIMO communication based on mixture of linear and non-linear reception,” SPAWC 2017, Sapporo, Japan, Jul. 2017.
  3. Yongjin Kwon, Jihoon Chung, and Youngchul Sung, "Hybrid beamformer design for mmWave wideband multi-user MIMO-OFDM systems," Invited Paper to The Special Session of Signal Processing for Millimeter Wave Communication Systems in SPAWC 2017, Sapporo, Japan, Jul. 2017.
  4. Donggun Kim, Gilwon Lee, and Youngchul Sung, "Two-stage beamformer design for massive MIMO downlink by trace quotient formulation," IEEE Transactions on Communications, vol. 63, no. 6, pp. 2200 - 2211, Jun. 2015.
  5. Masahiro Yukawa, Youngchul Sung and Gilwon Lee, "Dual-domain adaptive beamformer under linearly and quadratically constrained minimum variance," IEEE Transactions on Signal Processing, vol. 61, no. 11, pp. 2874 - 2886, Jun. 2013.
  6. Gilwon Lee, Juho Park, Youngchul Sung and Junyeong Seo, "A new approach to beamformer design for massive MIMO systems based on k-regularity," International Workshop on Emerging Technologies for LTE-Advanced and Beyond 4G in conjunction with IEEE Globecom 2012, Anaheim, CA, Dec. 2012.

Training Signal Design for MIMO Channel Estimation

  1. Junyeong Seo, Youngchul Sung, Gilwon Lee, and Donggun Kim, "Training beam sequence design for millimeter-wave MIMO systems: A POMDP framework," IEEE Transactions on Signal Processing, vol. 64, no. 5, pp. 1228 - 1242, Mar. 2016.
  2. Jungho So, Donggun Kim, Yuni Lee, and Youngchul Sung, "Pilot signal design for massive MIMO systems: A received signal-to-noise-ratio-based approach," IEEE Signal Processing Letters, vol. 52, no. 5, pp. 549 - 553, May 2015.
  3. Song Noh, Youngchul Sung*, and Michael Zoltowski, "A new precoder design for blind channel estimation for MIMO-OFDM systems," IEEE Transactions on Wireless Communications, vol. 13, no. 12, pp. 7011 - 7024, Dec. 2014
  4. Song Noh, Michael Zoltowski, Youngchul Sung, and David Love, "Pilot beam pattern design for channel estimation in massive MIMO systems," IEEE Journal of Selected Topics in Signal Processing, vol. 8, no. 5, pp. 787 - 801, Oct. 2014.
  5. Youngchul Sung, Tae Sung, Brian M. Sadler, and Lang Tong, "Training for MIMO communications," in Space-Time Wireless Systems: From Array Processing to MIMO Communications, edited by H. Bolcskei, D. Gesbert, C. Papadias, and A. J. van der Veen, Cambridge University Press, 2006.

Pareto-Optimal Coordinated Beamforming

  1. Juho Park and Youngchul Sung*, "On the Pareto-optimal beam structure and design for multi-user MIMO interference channels," IEEE Transactions on Signal Processing, vol. 61, no. 23, pp. 5932 - 5946, Dec. 2013.
  2. Juho Park, Gilwon Lee, Youngchul Sung*, and Masahiro Yukawa, "Coordinate beamforming with relaxed zero forcing: The sequential orthogonal projection combining method and rate control," IEEE Transactions on Signal Processing, vol. 61, no. 12, pp. 3100 - 3112, Jun. 2013.
  3. Youngchul Sung*, Juho Park, and Donggun Kim, "Trends and advances in MISO/MIMO technologies (in Korean)," KICS Information and Communications Magazine, Aug. 2012.
  4. Gilown Lee, Juho Park, Youngchul Sung and Masahiro Yukawa, "Coordinated beamforming with relaxed zero forcing," in Proc. of the 2011 International Conference on Wireless Communications and Signal Processing (WCSP), an invited paper to the special session "Interference Management Techniques in Wireless Networks," Nov. 2011.

Interference Alignment

  1. Heejung Yu, Juho Park, Youngchul Sung*, and Y. H. Lee "Research trend in interference alignment in multi-user interference channels (a survey article in Korean)," The Magazine of the IEEK, vol. 40, pp. 348 - 360, Apr. 2013.
  2. Junse Lee, Heejung Yu and Youngchul Sung*, "Beam tracking for interference alignment in time-varying MIMO interference channels: A conjugate gradient based approach," IEEE Transactions on Vehicular Technology, vol. 63, no. 6, pp. 958 - 964, Feb. 2014.
  3. Juho Park, Youngchul Sung*, Donggun Kim and H. Vincent Poor, "Outage probability and outage-based robust beamforming for MIMO interference channels with imperfect channel state information," IEEE Transactions on Wireless Communications, vol. 11, no. 10, pp. 3561 - 3573, Oct. 2012. "A technical report related to the paper regarding series expansion of Gaussian quadratic forms is also available.
  4. Yeongseok Oh, Heejung Yu, Yong H. Lee and Youngchul Sung*, "A nonlinear transceiver architecture for overloaded MIMO interference channels," IEEE Transactions on Communications, vol. 60, no. 4, pp. 946 - 951, Apr. 2012.
  5. Heejung Yu, Youngchul Sung*, Haksoo Kim and Yong H. Lee, "Beam tracking for interference alignment in slowly-fading MIMO interference channels: A perturbations approach under a linear framework," IEEE Transactions on Signal Processing, vol. 60, no. 4, pp. 1910 - 1926, Apr. 2012.
  6. Juho Park, Youngchul Sung*, and H. Vincent Poor, "On beamformer design for multiuser MIMO interference channels," arXiv preprint, Nov. 2010.
  7. Heejung Yu and Youngchul Sung*, "Least squares approach to joint beam design for interference alignment in multiuser multi-input multi-output interference channels," IEEE Transactions on Signal Processing, vol. 58, no. 9, pp. 4960 - 4966, Sep. 2010. ( Matlab codes for the algorithm are main and iterative least squares (ILS) algorithm subroutine. )

New Multiple Access and Waveforms

  1. Junyeong Seo, Youngchul Sung*, and Hamid Jafarkhani, "A high-diversity transceiver design for MISO broadcast channels," IEEE Transactions on Wireless Communications, vol. 18, no. 5, pp. 2591 - 2606, May 2019
  2. Jungho So, Youngchul Sung*, and Yong H. Lee, "Tomlinson-Harashima precoding-aided multi-antenna non-orthogonal multiple access," submitted to IEEE Journal of Selected Topics in Signal Processing, Aug. 2018
  3. Junyeong Seo and Youngchul Sung*, "Beam design and user scheduling for non-orthogonal multiple access with multiple antennas based on Pareto-optimality" IEEE Transactions on Signal Processing, vol. 66, no. 11, pp. 2876 - 2891, Jun. 2018.
  4. Junyeong Seo and Youngchul Sung, "A new transceiver architecture for multi-user MIMO communication based on mixture of linear and non-linear reception,” SPAWC 2017, Sapporo, Japan, Jul. 2017
  5. Seungyul Han, Youngchul Sung*, and Yong H. Lee, "Filter design for generalized frequency-division multiplexing," IEEE Transactions on Signal Processing, vol. 65, no. 7. pp. 1644 - 1659, Apr. 2017.
  6. Jungho So and Youngchul Sung, "Improving non-orthogonal multiple access by forming relaying broadcast channels," IEEE Communications Letters, vol. 20, no. 9, pp. 1816 - 1819, Sep. 2016. An extended version is available at arXiv.

Filter-and-Forward Relays

  1. Donggun Kim, Youngchul Sung, and Jihoon Chung, "Filter-and-forward relay design for MIMO-OFDM systems," IEEE Transactions on Communications, vol. 62, no. 7, pp. 2329 - 2339, Jul. 2014.
  2. Donggun Kim, Junyeong Seo and Youngchul Sung, "Filter-and-forward transparent relay design for OFDM systems," IEEE Transactions on Vehicular Technology, vol. 62, no. 9, pp. 4392-4407, Nov. 2013.
  3. Yingbo Yua, Daniel W. Bliss, Saeed Gazor, Yue Rong, and Youngchul Sung, "Guest Editorial: Theories and methods for advanced wireless relays - Issue II" IEEE Journal on Selected Areas in Communications, vol. 31, no. 8, pp. 1361 - 1367, Aug. 2013
  4. Yingbo Yua, Daniel W. Bliss, Saeed Gazor, Yue Rong, and Youngchul Sung, "Guest Editorial: Theories and methods for advanced wireless relays - Issue I," IEEE Journal on Selected Areas in Communications, vol. 30, no. 8, pp. 1297 - 1303, Sep. 2012
  5. Cheolsoon Kim, Youngchul Sung and Yong H. Lee, "A joint time-invariant filtering approach to the linear Gaussian relay problem," IEEE Transactions on Signal Processing , vol. 60, no. 8, pp. 4360 - 4375, Aug. 2012. Matlab code.
  6. Youngchul Sung and Cheolsoon Kim, "The capacity for the linear time-invariant Gaussian relay channel," Sep. 2011. Available at ArXiv. (This paper presents the capacity of a noncausal LTI Gaussian relay channel.) An improved version which provides causal achievability of the rate in the previous paper in arXiv. (Please see Theorem 3 in the new paper.)

Code-Division Multiple Access

  1. Youngchul Sung*, Yirang Lim, Lang Tong and Alle-Jan van der Veen, "Signal processing advances for 3G CDMA: From rake receivers to blind techniques," IEEE Communications Magazine, vol. 47, no. 1, pp. 48 - 54, Jan. 2009
  2. Youngchul Sung, Lang Tong* and Ananthram Swami, "Blind channel estimation for space-time coded WCDMA," EURASIP Journal on Wireless Communications and Networking, vol. 2004, no. 2, pp. 322 - 334, Dec. 2004
  3. Youngchul Sung and Lang Tong*, "Tracking of fast-fading channels in long code WCDMA," IEEE Transactions on Signal Processing, vol. 52, no. 3, pp. 786 - 795, Mar. 2004
  4. Lang Tong*, Alle-Jan van der Veen, Patrick Dewilde and Youngchul Sung, "Blind decorrelating rake receiver for long code WCDMA," IEEE Transactions on Signal Processing, vol. 51, no. 6, pp. 1642 - 1655, Jun. 2003

Real-World Professional Design

  1. Y. Sung, 3G WCDMA Basestation Modem Design and System Optimization, Contributions to 3GPP Release 7, work at the Corporate R & D Center, Qualcomm, Inc., San Diego, CA, 2005 - 2007
  2. Y. Sung, Z. Yang, L. Zhao, B. Lei, J. Sun and L. Tong, "Multitone acoustic sensor network with mobile access point: An experimental testbed," Demo Session, IPSN 2005, Los Angeles, CA, Apr. 2005. Project participants: Y. Sung, Z. Yang, B. Lei, L. Zhao, J. Sun, D. Han, L. F. Cheow, C. C. Lee, P. Venkitasubramaniam
  3. Y. Sung and J. Lee, "System simulation of wireless communication systems using HP-ADS," 1999 Hewlett-Packard Workshop, Seould, Korea, 1999.
  4. Y. Sung, Wireless local loop (WLL) project based 10MHz Wideband CDMA, Dept. of Digital Communications, LG Information and Communications, ltd.,1997 - 1999
  5. Y. Sung, Digital radio link project, 16 QAM, 4E1, 6GHz, Dept. of Satellite Communiations, LG Information and Communications, ltd., 1995 - 1996