Dr. Dong S. Ha Professor Office: 337 Durham Mailing Address: 302 Whittemore (0111) Virginia Tech Blacksburg, VA 24061 Tel: (540) 231-4942 Fax: (540) 231-3362 Email: Web page: http://www.ee.vt.edu/ha/

Biography:

Dong Ha received a B.S. degree in electrical engineering from Seoul National University, Korea, in 1974, and a M.S. and a Ph.D. degrees in electrical and computer engineering from the University of Iowa, Iowa City, in 1984 and 1986, respectively. Since Fall 1986, he has been a faculty member of the Department of Electrical and Computer Engineering, Virginia Polytechnic Institute and State university, Blacksburg, Virginia. Currently, he is Professor and Director of Center for Embedded Systems and Critical Applications (CESCA).
He supervises the VTVT (Virginia Tech VLSI for Telecommunications) group, which specializes in VLSI design for wireless communications including ultra wideband (UWB) and wireless sensor systems for monitoring and diagnosis of buildings and vehicles. During his research leave from January to June, 2003, he worked for Freescale (former Xtreme Spectrum), where he was involved in UWB system design and low-power base band signal processing. He contributed to a recent UWB book, “An Introduction to Ultra Wideband Communication Systems” and published over 30 papers in the UWB area alone in the past three years.  He served as General Chair of System-on-Chip (SOC) Conference in 2005.

Research Areas:

• Wireless sensor systems for monitoring and diagnosis of buildings and vehicles
• Low-power VLSI design for wireless communications
• Low-power/high speed analog and mixed-signal design, RF IC design
• UWB RFIDs
• ASIC design for baseband signal processing

Selected Publications:

• N. August and D.S. Ha, “Operation, System Architectures, and Physical Layer Design Considerations of Distributed MAC Protocols for UWB,” to appear in IEEE Transactions on Microwave Theory and Techniques.
• R. Thirugnanam, D.S. Ha, B.H. Park, and S.S. Choi,, “Design of a Tunable Fully Differential GHz Range Gm-C Lowpass Filter in 0.18 μm CMOS for DS-CDMA UWB Transceivers,” to appear in International Symposium on Circuits and Systems, May 2006.
• W.C. Chung, N.J. August, and D.S. Ha, “Impact of Ultra Wideband (UWB) Radio Range on Wireless Sensor Networks,” International Conference on Condition Monitoring and Diagnosis, Session 3.14 (4 pages), April, 2006.
• H.-J. Lee, D. S. Ha, and S.S. Choi, “AS 3-5 GHz CMOS UWB LNA with Input Matching Using Miller Effect,” International Solid-State Circuits Conference, Paper 11.6, February, 2006.
• N.J. August, W.C. Chung and D.S. Ha, “Distributed MAC Protocols for Ultra Wideband Ad Hoc and Sensor Networks,” Radio and Wireless Symposium, pp. 511-514, January, 2006.
• R.C. Palat, J. Kim, J.S. Lee, D.S. Ha, C. Patterson, and J.H. Reed, “Reconfigurable Modem Architecture for CDMA Based 3Handsets,” 2005 Software Defined Radio Technical Conference and Product Exposition, (7 pages), November, 2005.
• N.J. August, H.-J. Lee, and D.S. Ha, “Design of a Pulse Sensor to Detect Medium Activity in UWB Networks,” International Conference on Ultra Wideband, pp. 70-75, September 2005.
• R. Thirugnanam, D.S. Ha, and S.S. Choi, “4-bit 1.4 GS/s Low Power Folding ADC for UWB Systems”, International Conference on Ultra Wideband, pp. 536-541, September 2005.
• S. Wang, D.S. Ha, and S.S. Choi, “A 6-bit 5.4-Gsamples/s CMOS D/A Converter for DS-CDMA UWB transceivers”, International Conference on Ultra Wideband, pp. 333-338, September 2005.
• W.C. Chung, N.J. August, and D.S. Ha, “Modulation, coding, and signal processing for wireless communications - Signaling and multiple access techniques for ultra wideband 4G wireless communication systems,” IEEE Wireless Communications, vol.12, no.2, pp. 46-55, April 2005.