Research Fields

• Applied probability and stochastic modeling
• Service operations in healthcare, telecommunications, and power systems
• Statistical and adaptive signal processing

CV

Instructor

• ISyE 3232 Stochastic Manufacturing and Service Systems, Summer 2010 [course/instructor survey: 4.5/5.0]

Teaching Assistant

• ISyE 3232 Stochastic Manufacturing and Service Systems, Spring 2009
• ISyE 4803 Advanced Stochastic Systems, Spring 2008
• ISyE/Math 6761 Stochastic Processes I, Fall 2009

Publications

• Journal Articles in Operations Research

1. S. He and J. G. Dai, “Many-server queues with customer abandonment: numerical analysis of their diffusion models,” submitted to Stochastic Systems, Apr. 2011.
2. J. G. Dai, S. He, and T. Tezcan, “Many-server diffusion limits for G/Ph/n+GI queues,” Annals of Applied Probability, vol. 20, no. 5, pp. 1854–1890, Oct. 2010.
3. J. G. Dai and S. He, “Customer abandonment in many-server queues,” Mathematics of Operations Research, vol. 35, no. 2, pp. 347–362, May 2010.

• Journal Articles in Signal Processing

1. J. K. Tugnait and S. He, “Multiuser/MIMO doubly selective fading channel estimation using superimposed training and Slepian sequences,” IEEE Transactions on Vehicular Technology, vol. 59, no. 3, pp. 1341–1354, Mar. 2010.
2. J. K. Tugnait, S. He, and H. Kim, “Doubly-selective channel estimation using exponential basis models and subblock tracking,” IEEE Transactions on Signal Processing, vol. 58, no. 3, pp. 1275–1289, Mar. 2010.
3. S. He and J. K. Tugnait, “On doubly selective channel estimation using superimposed training and discrete prolate spheroidal sequences,” IEEE Transactions on Signal Processing, vol. 56, no. 7, pp. 3214–3228, Jul. 2008.
4. J. K. Tugnait and S. He, “Doubly-selective channel estimation using data-dependent superimposed training and exponential basis models,” IEEE Transactions on Wireless Communications, vol. 6, no. 11, pp. 3877–3883, Nov. 2007.
5. X. Meng, J. K. Tugnait, and S. He, “Iterative joint channel estimation and data detection using superimposed training: algorithms and performance analysis,” IEEE Transactions on Vehicular Technology, vol. 56, no. 4, pp. 1873–1880, Jul. 2007.
6. S. He, J. K. Tugnait, and X. Meng, “On superimposed training for MIMO channel estimation and symbol detection,” IEEE Transactions on Signal Processing, vol. 55, no. 6, pp. 3007–3021, Jun. 2007.
7. J. K. Tugnait, X. Meng, and S. He, “Doubly-selective channel estimation using superimposed training and exponential bases models,” EURASIP Journal on Applied Signal Processing, vol. 2006, Article ID 85303, 11 pages, 2006.

• Conference Proceedings

1. J. G. Dai and S. He, “Estimating customer patience-time density in large-scale call centers,” in Proc. 7th International Conference on Service Systems and Service Management (ICSSSM 2010), Tokyo, Japan, Jun. 28–30, 2010.
2. S. He and J. K. Tugnait, “Decision-directed tracking of doubly-selective channels using exponential basis models,” in Proc. 2008 IEEE International Conference on Communications (ICC 2008), Beijing, China, May 19–23, 2008, pp. 5098–5102.
3. J. K. Tugnait and S. He, “Recursive least-squares doubly-selective channel estimation using exponential basis models and subblock-wise tracking,” in Proc. 33rd IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP 2008), Las Vegas, NV, Mar. 30–Apr. 4, 2008, pp. 2861–2864.
4. S. He and J. K. Tugnait, “Doubly-selective channel estimation using exponential basis models and subblock tracking,” in Proc. 50th IEEE Global Telecommunications Conference (GLOBECOM 2007), Washington, DC, Nov. 26–30, 2007, pp. 2847–2851.
5. S. He and J. K. Tugnait, “Self-interference suppression in doubly-selective channel estimation using superimposed training,” in Proc. 2007 IEEE International Conference on Communications (ICC 2007), Glasgow, UK, Jun. 24–28, 2007, pp. 3028–3033.
6. S. He and J. K. Tugnait, “Doubly-selective multiuser channel estimation using superimposed training and discrete prolate spheroidal basis expansion models,” in 32nd IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP 2007), Honolulu, HI, Apr. 15–20, 2007, pp. ii-861–ii-864.
7. S. He and J. K. Tugnait, “Doubly-selective channel estimation using superimposed training and discrete prolate spheroidal basis models,” in Proc. 49th IEEE Global Telecommunications Conference (GLOBECOM 2006), San Francisco, CA, Nov. 27–Dec. 1, 2006.
8. S. He and J. K. Tugnait, “Direct equalization of multiuser doubly selective channels based on superimposed training,” in Proc. 14th European Signal Processing Conference (EUSIPCO 2006), Florence, Italy, Sep. 4–8, 2006.
9. J. K. Tugnait and S. He, “Direct FIR linear equalization of doubly selective channels based on superimposed training,” in Proc. 31st IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP 2006), Toulouse, France, May 14–19, 2006, pp. iv-589–iv-592.
10. S. He and J. K. Tugnait, “On bias-variance trade-off in superimposed training-based doubly selective channel estimation,” in Proc. 40th Conference on Information Sciences and Systems (CISS 2006), Princeton Univ., NJ, Mar. 22–24, 2006, pp. 1308–1313.
11. J. K. Tugnait and S. He, “Doubly-selective channel estimation using data-dependent superimposed training and exponential bases models,” in Proc. 40th Conference on Information Sciences and Systems (CISS 2006), Princeton Univ., NJ, Mar. 22–24, 2006, pp. 375–380.
12. J. K. Tugnait, S. He, and X. Meng, “On superimposed-training power allocation for time-varying channel estimation,” in Proc. 13th IEEE Workshop on Statistical Signal Processing (SSP 2005), Bordeaux, France, Jun. 17–20, 2005, pp. 1330–1335.
13. J. K. Tugnait and S. He, “Performance analysis of an MIMO channel estimator based on superimposed training and first-order statistics,” in Proc. 13th IEEE Workshop on Statistical Signal Processing (SSP 2005), Bordeaux, France, Jun. 17–20, 2005, pp. 1336–1341.
14. S. He, X. Shan, and Y. Ren, “A new adaptive equalization scheme for MIMO channels,” in Proc. 3rd International Symposium on Image and Signal Processing and Analysis (ISPA 2003), Rome, Italy, Sep. 18–20, 2003, pp. 1028–1033.
15. S. He and X. Shan, “Adaptive equalization for multipath fading channels using Laguerre filters,” in Proc. 2003 IEEE Pacific Rim Conference on Communications, Computers, and Signal Processing (PACRIM 2003), Victoria, Canada, Aug. 28–30, 2003, pp. 450–453.
16. S. He, X. Shan, Y. Ren, and S. Cao, “Adaptive Laguerre equalization for MIMO fading channels,” in Proc. 2003 IASTED International Conference on Circuits, Signals, and Systems, Cancun, Mexico, May 19–21, 2003, pp. 17–22.

Latest revision: April 8, 2011