Publications

Journals and CS Conferences

Machine Learning Conferences

7. Woojun Kim, Whiyoung Jung, Myungsik Cho, and Youngchul Sung, "A Maximum Mutual Information Framework for Multi-Agent Reinforcement Learning," submitted to NeurIPS 2020, June 2020. Available at arXiv.

6. Seungyul Han and Youngchul Sung, "Diversity Actor-Critic: Sample-Aware Entropy Regularization for Sample-Efficient Exploration," submitted to NeurIPS 2020, June 2020. Available at arXiv.

5. Sungho Choi, Seungyul Han, Woojun Kim, and Youngchul Sung, "Cross-Domain Imitation Learning with a Dual Structure," submitted to NeurIPS 2020, June 2020. Available at arXiv.

4. Whiyoung Jung, Giseung Park, and Youngchul Sung, "Population-Guided Parallel Policy Search for Reinforcement Learning," International Conference on Learning Representations (ICLR), Vienna, Austria, May 2020

3. Seungyul Han and Youngchul Sung, "AMBER: Adaptive Multi-Batch Experience Replay for Continuous Action Control ," IJCAI Workshop on Scaling Up Reinforcement Learning, 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

1. 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, Hawaii, Jan. 2019

Journals

Published or Accepted (Asterisks denotes corresponding authors.)

41. Song Noh, Jiho Song, and Youngchul Sung*, "Fast beam search and refinement for millimeter-wave massive MIMO based on two-level phased arrays," IEEE Transactions on Wireless Communications, vol. 19, no. 10, pp. 6737 - 6751, Oct. 2020

40. 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

39. 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.

38. 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

37. 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.

36. 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.

35. 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.

34. 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

33. 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

32. 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.

31. 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.

30. Song Noh, Youngchul Sung*, and Michael Zoltowski, "A new precoder design for blind channel estimation in MIMO-OFDM systems," IEEE Transactions on Wireless Communications, vol. 13, no. 12, pp. 7011-7024, Dec. 2014.

29. 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.

28. 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. Proof of Lemma 1

27. 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. 2, pp. 958 - 964, Feb. 2014.

26. 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.

25. 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.

24. 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

23. Juho Park, Gilwon Lee, Youngchul Sung* and Masahiro Yukawa, "Coordinated 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.

22. 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.

21. 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.

20. 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.)

19. 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

18. Cheulsoon 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.

17. Haksoo Kim, Heejung Yu, Youngchul Sung* and Yong H. Lee, "An efficient algorithm for zero-forcing coordinated beamforming," IEEE Communications Letters, vol. 16, no. 7, pp. 994 - 997, Jul. 2012

16. Youngseok 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.

15. 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.

14. 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. )

13. Jo Woon Chong, Dan Keun Sung* and Youngchul Sung, "Cross-layer performance analysis for CSMA/CA protocols: Impact of imperfect sensing," IEEE Transactions on Vehicular Technology, vol. 59, no. 3, pp. 1100 - 1108, Mar. 2010.

12. Jo Woon Chong, Youngchul Sung* and Dan Keun Sung, "RawPEACH: Multi-band CSMA/CA-based cognitive radio networks," Journal of Communications and Networks, vol. 11, no. 2, pp. 174 - 185, Apr. 2009.

Early Works: CDMA and Detection/Estimation

11. 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.

10. 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.

9. Youngchul Sung*, Yirang Lim, Lang Tong and Alle-Jan van der Veen, "Signal processing advances for 3G WCDMA: From rake receivers to blind techniques," IEEE Communications Magazine, no. 1, pp. 48 - 54, Jan. 2009

8. 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.

7. Youngchul Sung*, Saswat Misra, Lang Tong and Anthony Ephremides, "Cooperative routing for distributed 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.

5. 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. (This paper's conference version won ICASSP 2005 Paper Award.)

4. 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.

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.

2. Youngchul Sung and Lang Tong*, "Tracking of fast-fading channels in long code CDMA," IEEE Transactions on Signal Processing, vol. 52, no.3, pp. 786-795, Mar. 2004.

1. 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.

Korean Articles

7. J. Chung et al., “5G K-simulink: Development of open-source modular link-level simulator for 5G NSA,” The Journal of Korean Institute of Communications and Information Sciences, vol. 44, no. 3, pp. 602 – 608, Mar. 2019

6. J. Chung, J. So, J. Seo, G. Par, and Y. Sung*, “Introduction to 5G mmWave Communication,” Technology Trends, Special Series on 5G, pp. 1 – 14, National IT Industry Promotion Agency (NIPA), Apr. 2018 (an invited article)

5. Youngchul Sung*, “An introduction to multiple access in wireless communications,” KICS Information and Communication Magazine – Open Lecture Series, vol. 33, no. 6, pp. 10 – 17, Jun. 2016 (an invited article)

4. Jihoon Chung, Donggun Kim, and Youngchul Sung*, “Design of amplify-and-forward helper stations for Cellular networks with device-to-device links,” The Journal of Korean Institute of Communications and Information Sciences, vol. 41, no. 5, pp. 539 – 545, May 2016

3. Gilwon Lee, Youngchul Sung*, Jungho So, and Junyeong Seo, “Research trends for realization of 5G massive MIMO,” IEEK Magazine, pp. 16 - 34, Oct. 2015 (an invited article)

2. Heejung Yu, Juho Park, Youngchul Sung*, and Yong H. Lee, “Research trends in interference alignment for multi-user interference channels,” IEEK Magazine, pp. 204 – 216, Apr. 2013 (an invited article)

1. Youngchul Sung*, Juho Park, and Donggun Kim, “Trends and advances in multi-cell MISO/MIMO technologies,” KICS Information and Communication Magazine, pp. 11 – 18, Aug. 2012 (an invited article)