• Ph.D. in Electrical and Computer Engineering, University of California at San Diego, USA
• S.B. and M.Eng. in Electrical Engineering and Computer Science, Massachusetts Institute of Technology, USA

Wireless communications and networking. Resource allocation and scheduling. Performance analysis of queuing systems. Stochastic optimization. Smart grid.

Wireless Networking and Communications

We are interested in a wide range of topics in wireless networking and communications in both single-hop and multi-hop networks. For single-hop wireless networks, we have done research on queuing performance analysis of dynamic schedulers using asymptotic approximation based on large-deviations theory. We have also studied OFDMA (Orthogonal Frequency Division Multiple Access) systems, in particular, in a) showing delay-optimality of a dynamic load-balancing scheduler in multi-queue multi-server systems; b) studying dynamic scheduling of OFDMA subcarriers with partial feedback of the channel information but full knowledge of queue information; and c) studying the interplay between rate-adaptive sources such as TCP and dynamic OFDMA schedulers.

For multi-hop wireless networks, we are currently studying the following topics: a) a channel reservation multiple access (MAC) scheme in IEEE 802.11s; and b) emergency message broadcast in vehicular networks to avoid road accidents.

Optimization and Smart Grid

We are interested in smart demand response which automatically arranges usages of appliances in a household or buildings. This demand response is a major part of the future power systems, known as smart grids.

• 2008-Present: Lecturer, SIIT, Thammasat University, Thailand
• 2005-2008: Graduate Student Researcher, University of California, San Diego, USA
• 2003-2004: Graduate Research Assistant, University of Washington, Seattle, USA
• 1996-2003: Engineer, Shin Satellite Plc, Nonthaburi, Thailand

Journals:

• P. Kheawchaoom and S. Kittipiyakul, “Effects of stochastic and deterministic defer times on time-stable geocast in VANETs”, IAENG International Journal of Applied Mathematics, vol. 43, no. 1, pp. 30-36, Feb. 2013.
• V. G. Subramanian, T. Javidi, and S. Kittipiyakul, “Many-sources large deviations for max-weight scheduling,” IEEE Transactions on Information Theory, vol. 57, no. 4, pp. 2151-2168, April 2011.
• S. Kittipiyakul and T. Javidi, “Delay-optimal server allocation in multiqueue multiserver systems with time-varying connectivities,” IEEE Transactions on Information Theory, vol. 55, no. 5, pp. 2319-2333, May 2009.
• S. Kittipiyakul, P. Elia, and T. Javidi, “High-SNR analysis of outage-limited communications with bursty and delay-limited information,” IEEE Transactions on Information Theory, vol. 55, no. 2, pp. 746-763, Feb. 2009.
• S. Kittipiyakul and T. Javidi, “Optimal operating point for MIMO multiple access channel with bursty traffic,” IEEE Transactions on Wireless Communications, vol. 6, no. 12, pp. 4464-4474, Dec. 2007.
• S. Kittipiyakul and T. Javidi, “Resource allocation in OFDMA with time-varying channel and bursty arrivals,” IEEE Communications Letters, vol. 11, no. 9, pp. 708-710, Sept. 2007.

Conferences:

• A. Pornchaicharoen, K. Kaemarungsi, S. Kittipiyakul, and K. Fukawa, “An implementation of time syschronization in ZigBee wireless sensor network with timekeeping chips”, in the International Conference on Information and Communication Technology for Embedded Systems (ICICTES 2013) [CD-ROM], Samutsongkhram, Thailand, January 2013.
• P. Kheawchaoom and S. Kittipiyakul, “Effects of distance-based defer times and probabilistic channel to time-stable geocast”, in World Congress on Engineering & Computer Science 2012 (WCECS 2012) Vol. II [CD-ROM], San Francisco, USA, October 2012.
• P. Kheawchaoom; S. Kittipiyakul; and K. Siriwong Na Ayutaya, “iDTSG time-stable geocast for post crash notification in vehicular highway networks”, in the 2012 9^th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON 2012) [CD-ROM], Phetchaburi, Thailand, May 2012.
• T. Sakdejayont, N. Jindapornsopit, and S. Kittipiyakul, “Performance of gradient-based OFDMA subcarrier schedulers with TCP traffic,” in the 8th Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI) Association, Thailand – Conference (ECTI-CON 2011), Khon Kaen, Thailand, May 2011.
• S. Kittipiyakul, A. Boonkajay, and T. Aphichartsuphapkhajorn, “Performance of low-feedback-rate, gradient-based OFDMA subcarrier allocation with partial channel information,” in the 5th IEEE International Symposium on Wireless Pervasive Computing (ISWPC 2010), Modena, Italy, May 2010.
• V. Boonsawat, J. Ekchamanonta, K. Bumrungkhet, and S. Kittipiyakul, “XBee wireless sensor networks for temperature monitoring,” in the Second Conference on Application Research and Development (ECTI-CARD 2010), Chon Buri, Thailand, May 2010.
• V. Mayalarp, N. Limpaswadpaisarn, T. Poombansao, and S. Kittipiyakul, “Wireless mesh networking with XBee,” in the Second Conference on Application Research and Development (ECTI-CARD 2010), Chon Buri, Thailand, May 2010.
• S. Kittipiyakul, T. Javidi, and V. G. Subramanian, “Many-sources large deviations for max-weight scheduling,” in 46^th Annual Allerton Conference on Communication, Control, and Computing (Allerton’08), Sep. 2008.
• S. Kittipiyakul and T. Javidi, “Relay scheduling and cooperative diversity for delay-sensitive and bursty traffic,” in 45^th Annual Allerton Conference on Communication, Control, and Computing, Monticello, Illinois, USA, Sep. 2007.
• P. Elia, S. Kittipiyakul, and T. Javidi, “Cooperative diversity in wireless networks with stochastic and bursty traffic,” in IEEE Int. Symp. Information Theory, Nice, France, Jun. 2007.
• P. Elia, S. Kittipiyakul, and T. Javidi, “On the Responsiveness-Diversity-Multiplexing tradeoff,” in 5^th Intl. Symp. on Modeling and Optimization in Mobile, Ad Hoc, and Wireless Networks, Limassol, Cyprus, Apr. 2007.
• S. Kittipiyakul and T. Javidi, “Optimal operating point in MIMO channel for delay-sensitive and bursty traffic,” in IEEE Int. Symp. Information Theory, Seattle, Washington, USA, Jul. 2006.
• S. Kittipiyakul and T. Javidi, “Subcarrier allocation in OFDMA systems: beyond water-filling,” in 2004 Asilomar Conference on Signals, Systems, and Computers, Nov. 2004.
• S. Kittipiyakul and T. Javidi, “A fresh look at optimal subcarrier allocation in OFDMA systems,” in IEEE Conference on Decision and Control (CDC 2004), Dec. 2004.

Theses:

• S. Kittipiyakul, “Cross-Layer Optimization for Transmission of Delay-Sensitive and Bursty Traffic in Wireless Systems,” Ph.D. Dissertation, UCSD, 2008.
• S. Kittipiyakul, “Automated remote microscope for inspection of integrated circuits,” M.Eng. Thesis, MIT, 1996.

Personal Homepage

http://www.siit.tu.ac.th/somsak/