Publications

Conferences

International Conferences

53. 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

51. 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

50. 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, USA Jan. 2019

49. G. Park, S. Park, J. Seo, J. So, W. Wang, S. Yoo, S.-C. Lim, J. Chung, M.Cho, D. Ha, J. Kang, H. Park, and Y. Sung, “5G K-Simulator: Link Level Simulator for 5G,” IEEE DySPAN, Seoul, Korea, Oct. 2018

48. Jungho So and Youngchul Sung, “Common pilot signal design for non-orthogonal multiple access in 5G,” IEEE TENCON, Jeju, Korea, Oct. 2018

47. Whiyoung Jung and Youngchul Sung, “Facial expression classification with universum data,” the 5th International Conference on Robot Intelligence Technology and Applications (RiTA), Daejeon, South Korea, Dec. 2017

46. 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

45. 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

44. Gilwon Lee, Jungho So, and Youngchul Sung, “Impact of training on mmWave multiuser MIMO downlink,” 2016 GlobalSIP, Arlington, VA, Dec. 2016

43. Gilwon Lee and Youngchul Sung, "Random beamforming combined with receive beamforming in mmWave multiuser MIMO downlink,” URSI Asia-Pacific Radio Science Conference, , Seoul, Korea, Aug. 2016

42. Gilwon Lee, Youngchul Sung, and Marios Kountouris, "How can one efficiently schedule users in mmWave massive MIMO?” 2016 IEEE Communication Theory Workshop, Nafplio, Greece, May 2016

41. Gilwon Lee, Youngchul Sung*, and Junyeong Seo, "How many users are needed for non-trivial performance of random beamforming in highly-directional mm-wave MIMO downlink?,2015 IEEE Information Theory Workshop, Jeju, Korea, Oct. 2015.

40. 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.

39. Junyeong Seo, Youngchul Sung*, Gilwon Lee, and Donggun Kim, "Pilot beam sequence design for channel estimation in millimeter-wave MIMO systems: A POMDP framework,SPAWC 2015, Stockholm, Sweden, Jun. 2015.

38. Jungho So, Sangwoon Kwak, and Youngchul Sung*, "Some new results on index coding when the number of data is less than the number of receivers,ISIT 2014, Hawaii, HI, Jun. 2014. Supplement

37. Sangwoon Kwak, Jungho So, and Youngchul Sung*, "An extended least difference greedy clique-cover algorithm for index coding,ISIT 2014, Hawaii, HI, Jun. 2014.

36. 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.

35. Song Noh, Michael Zoltowski, Youngchul Sung, and David Love, "Training signal design for channel estimation in massive MIMO systems," Proc. of ICASSP 2014, Florence, Italy, May 2014.

34. Song Noh, Michael Zoltowski, Youngchul Sung, and David Love, "Optimal pilot beam pattern design for massive MIMO systems," in Asilomar Conference on Signals, Systems, and Computers, Pacific Grove, CA, Nov. 2013.

33. Juho Park and Youngchul Sung*, "An efficient parameterization for Pareto-optimal beamformers for K-user MIMO interference channels ," in Proc. of ICASSP 2013, Vancouver, Canada, May 2013.

32. 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 Globecom 2012, Anaheim, CA, Dec. 2012.

31. Donggun Kim, Junyeong Seo, and Youngchul Sung, "Filter-and-forward relay design for OFDM systems for quality-of-servie enhancement," in Proc. of APSIPA 2012, Hollywood, CA, Dec. 2012.

30. G. Lee, J. Park, Y. Sung* and J. 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.

29. Y. Lee and Y. Sung*, "'The Bahadur efficiency for energy detection of stationary Gaussian processes"ICASSP 2012, Kyoto, Japan, Mar. 2012.

28. Juho Park, Donggun Kim and Youngchul Sung*, "Sum outage rate maximization for MIMO interference channels," in Proc. of Globecom 2011, Houston, TX, Dec. 2011.

27. Gilwon 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), invited paper to the special session "Interference Management Techniques in Wireless Networks," Nov. 2011.

26. M. Yukawa, Y. Sung and G. Lee, "Adaptive interference suppression in MIMO multiple access channels based on dual-domain approach," in Proc. of ITC-CSCC 2011, Gyeongju, Korea, June 2011.

25. J. Lee, H. Yu, Y. Sung and Y. H. Lee, "Adaptive beam tracking for interference alignment in time-varying MIMO interference channels: Conjugate gradient approach," in Proc. of ICASSP 2011, Prague, Czech Republic, May 2011. (The algorithm in this paper is a pure adaptive version of that in the ICASSP 2010 paper below.)

24. S. Noh and Y. Sung, "Precoder design for blind channel estimation in multiple OFDM systems," in Proc. of APSIPA 2010, Singapore, December 2010

23. H. Yu and Y. Sung, "Iterative algorithm for interference alignment in multiuser MIMO interference channels," in SPAWC 2010, Marrakech, Morocco, June 2010. (This is an improved iterative version of the previous algorithm in SPAWC 09.)

22. H. Yu, Y. Sung, H. Kim and Y. H. Lee, "Adaptive beam tracking for interference alignment for multiuser time-varying MIMO interference channels," in Proc. of ICASSP 2010, Dallas, Texas, March 2010

21. H. Yu, J. Park, Y. Sung and Y. H. Lee, "A least squares approach to joint beam design for interference alignment in multiuser interference channels," in Proc. of SPAWC 2009, Perugia, Italy, June 2009

20. Jo Woon Chong, Youngchul Sung and Dan Keun Sung, "Multi-band CSMA/CA-based cognitive radio networks," in Proc. of IWCMC 2009, Leipzig, Germany, June 2009

19. Yirang Lim and Youngchul Sung, "Upper bound for the loss factor of energy detection of random signals in multipath fading cognitive radios," in Proc. of ICASSP 2009, Taipei, Taiwan, April 2009

18. H. Kim, S. Choi, H. Yu, Y. Sung and Y. H. Lee, "Amplify-forward relays with superimposed pilot signals for frequency-selective fading channels,” in Proc. of VTC 2009, Barcelona, Spain, April 2009

17. Heejung Yu, Youngchul Sung and Yong H. Lee, "Superposition data transmission for cognitive radios: Performance and algorithms,"IEEE MILCOM, San Diego, CA, Nov. 2008

16. Jo Woon Chong, Youngchul Sung and Dan Keun Sungm, "Analysis of CSMA/CA systems under carrier sensing error: Throughput, delay and sensitivity,"IEEE Globecom 2008, New Orleans, LA, Nov. 2008

15. Jo Woon Chong, Youngchul Sung and Dan Keun Sung, "Cross-layer performance analysis for CSMA/CA systems: Impact of imperfect sensing," in Proc. of the 9th IEEE Workshop on Signal Processing Advances in Wireless Communications (SPAWC), Recife, Brazil, July 2008

14. Youngchul Sung, H. Vincent Poor and Heejung Yu, "Information, energy and density for ad hoc sensor networks over correlated random fields: Large deviations analysis," in 2008 IEEE International Symposium on Information Theory (ISIT), Toronto, Ontario, Canada, July 2008

13. Youngchul Sung, H. Vincent Poor and Heejung Yu, "Optimal node density for two-dimensional sensor arrays," in Proc. of5th IEEE Workshop on Sensor Array and Multi-Channel Signal Processing (SAM 2008), Darmstadt, Germany, July 2008

12. Y. Sung, H. V. Poor and H. Yu, "Large deviations analysis for the detection of 2-D hidden Gauss-Markov random fields using sensor networks," Proc. of 2008 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), Las Vegas, Nevada, March 2008

11. H. Yu, Y. Sung and Y. H. Lee, "On optimal operating characteristics of sensing and training for cognitive radios," Proc. of 2008 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), Las Vegas, Nevada, March 2008

10. Y. Sung, L. Tong and A. Ephremides, “A new metric for routing in multi-hop wireless sensor Networks for detection of correlated random fields,” in Proc. of MILCOM’05, Atlantic City, New Jersey, October 2005

9. Y. Sung, L. Tong and H. V. Poor, “Neyman-Pearson detection of Gauss-Markov signals in noise: Closed-form error exponent and properties,” in Proc. of 2005 IEEE International Symposium on Information Theory (ISIT), Adelaide, Australia, September 2005

8. Y. Sung, L. Tong and H. V. Poor,“Optimal and suboptimal detection of Gaussian signals in noise: Asymptotic relative efficiency,” in Proc. of the Conference on Advanced Signal Processing Algorithms, Architectures, and Implementations XV, part of SPIE International Symposium, San Diego, CA, July 2005

7. Y. Sung, L. Tong and A. Ephremides, “Route selection for detection of correlated random fields in large sensor networks,” in Proc. of CISS’05, Johns Hopkins University, Baltimore, MD, March 2005

6. Y. Sung, L. Tong and H. V. Poor, “A large deviations approach to sensor scheduling for detection of correlated random fields,” in Proc. of ICASSP 2005, Philadelphia, PA, March 2005 (ICASSP 2005 Student Best Paper Award)

5. Y. Sung, L. Tong and A. Swami, “Asymptotic locally optimal detector for large-scale sensor networks under the Poisson regime,” in Proc. of 2004 ICASSP, Montreal, QC, Canada, May 2004

4. Y. Sung, L. Tong and A. Swami, “Semi-blind channel estimation for space-time coded WCDMA downlink,” in Proc. of 2003 ICC, Anchorage, AK, May 2003

3. Y. Sung and L. Tong, “Blind channel tracking for long code WCDMA with linear interpolation model,” in Proc. of 2002 Asilomar Conference, Monteray, CA, November 2002

2. Y. Sung and L. Tong, “Channel tracking for long code WCDMA,” in Proc. of 2002 MILCOM, Anaheim, CA, October 2002.

1. Y. Sung and L. Tong, “A projection-based semi-blind channel estimation for long-code WCDMA,” in Proc. of 2002 ICASSP, Orlando, FL, May 2002

Korean Conferences

16. Gilwon Lee, Jungho So, and Youngchul Sung, “A new hierarchical beam training method for millimeter-wave communication,” Joint Conference on Communications & Information (JCCI), Apr. 2017

15. Seungyeol Han and Youngchul Sung, “Filter optimization for generalized frequency division multiplexing,” Joint Conference on Communications & Information (JCCI), Apr. 2016

14. Gilwon Lee and Youngchul Sung, “Improved random beamforming in mmWave channels,” Joint Conference on Communications & Information (JCCI), Apr. 2016

13. Gilwon Lee, Youngchul Sung, Junyeong Seo, “Random beamforming in mmWave channels,” Joint Conference on Communications & Information (JCCI), Apr. 2015

12. Jihoon Chung, Donggun Kim, and Youngchul Sung, “Optimal design of amplify-and-forward helper stations for cellular networks with device-to-device links,” Korean Institute of Communications and Information Sciences (KICS), Fall Conference, Apr. 2014

11. Jihoon Chung, Junyeong Seo, Donggun Kim, Youngchul Sung, “Efficient direction-of-arrival estimation based on mm wave channel modeling,” Joint Conference on Communications & Information (JCCI), Apr. 2014

10. Song Noh and Youngchul Sung, “Linear precoder design for blind channel estimation for MIMO-OFDM systems under a sparse structure,” IEEK 2011 Summer Conference, Jeju, Korea, Jun. 2011

9. Donggun Kim, Juho Park and Youngchul Sung, “Robust beam design in multi-input multi-output interference channels based on mean square error,” Joint Conference on Communications & Information (JCCI), May 2011

8. Cheulsoon Kim, Youngchul Sung and Yong H. Lee, “Interference-symbol-based user cooperation scheme,” Joint Conference on Communications & Information (JCCI), May 2011

7. Juho Park and Youngchul Sung, “Interference alignment in asymmetric multi-input multi-output interference channels,” Joint Conference on Communications & Information (JCCI), Apr. 2010. (Best Paper Award in JCCI 2010)

6. Heejung Yu, Youngchul Sung and Yong H. Lee, “Joint optimization of transmit power and operating point of channel sensingfor cognitive radio networks,” Joint Conference on Communications & Information (JCCI), Apr. 2010

5. Haksoo Kim, Heejung Yu, Youngchul Sung and Yong H. Lee, “Bilinear programming approach to interference alignment,” KICS Fall Workshop, Nov. 2009

4. Heejung Yu, Juho Park, Youngchul Sung and Yong H. Lee, “A non-iterative approach to beam design for interference alignment for multiuser interference channels,” KICS CITS Workshop, Daejeon, Korea, Feb. 2009

3. Haksoo Kim, Heejung Yu, Youngchul Sung and Yong H. Lee, “Analysis of point-to-point communication coexisting with OFDM-based cellular systems,” the 12th Communication and Electronics Conference, Seoul, Oct. 2008

2. Haksoo Kim, Sungho Choi, Youngchul Sung and Yong H. Lee, “AF relay system employing superimposed pilot over frequency-selective channels, Joint Conference on Communications & Information (JCCI), Jeju, Korea, Apr. 2008

1. Heejung Yu, Youngchul Sung and Yong H. Lee, “Superposition data transmission for secondary users in cognitive radios,” Joint Conference on Communications & Information (JCCI), Jeju, Korea, Apr. 2008