Electrical and Computer Engineering
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Changzhi Li

 

Changzhi Li
 
Title: Assistant Professor
Phone: 806-742-3533 ext. 239
Fax: 806-742-1245
Office: 211
E-mail: changzhi.li(at)ttu(dot)edu
 
Research interests: Doppler radar-on-chip for biomedical and security applications; CMOS/BiCMOS software-defined radio; RF applications of III-V devices; Sensor network; Microwave passive components, antenna; Doppler radar replacement of interferometer/vibrometer; Neural science;

Biography

Dr. Changzhi Li received the B.S. degree in electrical engineering from Zhejiang University, Hangzhou, China, in 2004, the M.S. and Ph.D. degrees in electrical engineering from the University of Florida, Gainesville, FL, in 2007 and 2009, respectively.

In the summers of 2007 and 2008, he worked at Alereon Inc., Austin, TX, on ultrawideband (UWB) transceiver. In the summer of 2009, he worked at Coherent Logix Inc., Austin, TX, on software-defined radio. His research interests include Microwave/Millimeter-Wave Circuits, wireless sensor, frequency synthesizers, and biomedical applications of Microwave/RF.

Dr. Li received IEEE MTT-S Graduate Fellowship Award in 2008. He is the second place recipient of the Best Student Paper award in the 2007 IEEE Radio and Wireless Symposium (RWS), and is the finalist in the 2008 IEEE MTT-S International Microwave Symposium (IMS) Student Paper Competition.

Publications

  1. C. Gu, C. Li, J, Huangfu, J. Lin. L. Ran, "Instrument-based Non-contact Doppler Radar Vital Sign Detection System Using Heterodyne Digital Quadrature Demodulation Architecture," IEEE Transactions on Instrumentation and Measurement, in print, 2009.
  2. C. Li, J. Ling, J. Li, J. Lin, "Accurate Doppler Radar Non-contact Vital Sign Detection Using the RELAX Algorithm", in print, IEEE Transactions on Instrumentation and Measurement, 2009.
  3. Z. Park, C. Li, J. Lin, "A Broadband Microstrip Antenna With Improved Gain for Noncontact Vital Sign Radar Detection", IEEE Antenna and Wireless Propagation Letters, vol. 8, pp. 939-942, 2009.
  4. C. Li, J. Cummings, J. Lam, E. Graves, W. Wu, "Radar Remote Monitoring of Vital Signs " From Science Fiction to Reality", IEEE Microwave Magazine, vol. 10, issue 1 (GOLD special issue), pp. 47-56, February 2009. (Invited)
  5. C. Li, J. Lin, "Random Body Movement Cancellation in Doppler Radar Vital Sign Detection," IEEE Transactions on Microwave Theory and Techniques, vol. 56, issue 12, pp. 3143-3152, December 2008.
  6. C. Li, Y. Xiao, J. Lin, "A 5 GHz Double-Sideband Radar Sensor Chip in 0.18 μm CMOS for Non-contact Vital Sign Detection," IEEE Microwave and Wireless Components Letters, vol. 18, issue 7, pp. 494-496, July 2008.
  7. X. Yu, C. Li, Z. N. Low, J. Lin et al., "Wireless hydrogen sensor network using AlGaN/GaN high electron mobility transistor differential diode sensors", Sensors and Actuators B: Chemical, in press.
  8. B. S. Kang, H. T. Wang, F. Ren, M. Hlad, B. P. Gila, C. R. Abernathy, S. J. Pearton, C. Li, Z. N. Low, J. Lin, J. W. Johnson, P. Rajagopal, J. C. Roberts, E. L. Piner, and K. J. Linthicum, "Role of Gate Oxide in AlGaN/GaN High-Electron-Mobility Transistor pH Sensors," Journal of Electronic Materials, Vol. 37, No. 5, pp. 550-553, 2008.
  9. Y. Xiao, C. Li, J. Lin, "A Portable Non-Contact Heartbeat and Respiration Monitoring System Using 5-GHz Radar," IEEE Sensors Journal, vol. 7, issue 7, pp. 1042-1043, July 2007.
  10. H. T. Wang, T. J. Anderson, B. S. Kang, F. Ren, C. Li, Z. N. Low, J. Lin, B. P. Gila, S. J. Pearton, "Stable Hydrogen Sensors from AlGaN/GaN Heterostructure Diodes with TiB2-based Ohmic Contacts", Applied Physics Letters, vol. 90, 252109, 2007.
  11. C. Li, Y. Xiao, J. Lin, "Experiment and Spectral Analysis of a Low-Power Ka-Band Heartbeat Detector Measuring from Four Sides of a Human Body," IEEE Transactions on Microwave Theory and Techniques, vol. 54, no. 12, pp. 4464-4471, December 2006.
  12. H. T. Wang, T. J. Anderson, F. Ren, C. Li, Z. N. Low, J. Lin, B. P. Gila, S. J. Pearton, "Robust Detection of Hydrogen Using Differential AlGaN/GaN High Electron Mobility Transistor Sensing Diodes," Applied Physics Letters, vol. 89, 242111, 2006.
  13. C. Li, Y. Huang et al., "Amplification Properties of Erbium-doped Solid-core Photonic Bandgap Fibers", IEEE Photonics Technology Letters, vol. 17, no. 2, pp. 324-326, Feb 2005.
  14. C. Li, W. Zhang et al., "Numerical Study on Bragg Fibers for Infrared Applications", International Journal of Infrared and Millimeter Waves, vol. 26, no. 6, pp. 893-904, June 2005.
  15. C. Li, "Numerical Study on the Waveguiding Properties of Photonic Crystal Fibers", International Journal of Infrared and Millimeter Waves, vol. 25, no. 8, pp. 1245-1254, Aug 2004.
  16. C. Li, K. Chen, "Transmission Line Model Based CAD of Multilayer Dielectric Filters", International Journal of Infrared and Millimeter Waves, vol. 25, no. 5, pp. 775-785, May 2004.
  17. C. Li, J. Lin, "Doppler Radar Non-contact Measurement of Rotational Movement in Both Macro- and Micro- Scales", IEEE Asia-Pacific Microwave Conference (APMC), Singapore, Dec 2009.
  18. Y. Yan, C. Li, X. Yu, M. D. Weiss, J. Lin, "Verification of a Non-Contact Vital Sign Monitoring System Using an Infant Simulator", IEEE Engineering in Medicine and Biology Society, Minneapolis, September 2009.
  19. C. Li, X. Yu, D. Li, L. Ran, and J. Lin, "Software Configurable 5.8 GHz Radar Sensor Receiver Chip in 0.13 μm CMOS for Non-contact Vital Sign Detection", IEEE RFIC Symposium, Boston, June 2009.
  20. X. Yu, C. Li, J. Lin, "System Level Integration of Handheld Wireless Non-contact Vital Sign Detectors", Proceedings of IEEE Radio and Wireless Symposium, San Diego, January 9-11, 2009.
  21. C. Li, J. Lin, "Complex Signal Demodulation and Random Body Movement Cancellation Techniques for Non-contact Vital Sign Detection," IEEE MTT-S International Microwave Symposium, pp. 567-570, Atlanta, June, 2008.
  22. O. Boric-Lubecke, J. Lin, B.-K. Park, C. Li, W. Massagram, V. M. Lubecke, A. Host-Madsen, "Battlefield Triage Life Signs Detection Techniques," Proceedings of the SPIE Defense and Security Symposium, Vol. 6947 " Radar Sensor Technology XII, No. 69470J, 10 pages, April 2008.
  23. T. Anderson, H. T. Wang, B. S. Kang, C. Li, Z. N. Low, J. Lin, S. J. Pearton, J. Painter, C. Balaban, A. Osinsky, A. Dabiran, P. Chow, and F. Ren, "Advances in Wireless Hydrogen Sensor Networks," NHA Annual Hydrogen Conference 2008, March 31-April 4, 2008.
  24. J. Lin, C. Li, "Wireless Non-Contact Detection of Heartbeat and Respiration Using Low-Power Microwave Radar Sensor", 2007 Asia-Pacific Microwave Conference, Vol. 1, pp. 393-396, Bangkok, Thailand, December 2007. (Invited)
  25. C. Li, J. Lin et al. "Development of Non-contact Physiological Motion Sensor on CMOS Chip and Its Potential Applications", The 7th International Conference on Application-Specific Integrated Circuits (ASICON), Vol. 2, pp. 1022-1027, Guiling, China, Oct. 26 " Oct. 29, 2007. (Invited)
  26. C. Li, J. Lin, Y. Xiao, "Design Guidelines for Radio Frequency Non-contact Vital Sign Detection," IEEE 29th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, pp. 1651-1654, Lyon, France, Aug. 23 " Aug. 26, 2007.
  27. T. Anderson, H.T. Wang, C. Li, Z. N. Low, B. S. Kang, J. Lin, S. J. Pearton, A. Osinsky, Amir Dabiran, P. Chow, J. Painter, F. Ren, "A New Advance in Hydrogen Sensors," Hydrogen and Fuel Cell Safety, July 2007. (Invited)
  28. C. Li, J. Lin, "Non-Contact Measurement of Periodic Movements by a 22-40GHz Radar Sensor Using Nonlinear Phase Modulation," IEEE MTT-S International Microwave Symposium, pp. 579-582, Honolulu, June, 2007.
  29. H. Wang, T. Anderson, F. Ren, C. Li, Z. Low, J. Lin, B. Gila, S. Pearton, A. Dabiran, A. Osinsky, "Robust Detection of Hydrogen Using Differential AlGaN/GaN High Electron Mobility Transistor Sensing Diodes," 211th Meeting of the Electrochemical Society, Chicago, May 2007.
  30. T. Anderson, H. T. Wang, B. S. Kang, F. Ren, C. Li, Z. N. Low, J. Lin, and S. J. Pearton, "Wireless Hydrogen Sensor Networks Using GaN-based Devices," NHA Annual Hydrogen Conference 2007, San Antonio, TX, March 19-22, 2007.
  31. C. Li, J. Lin, "Optimal Carrier Frequency of Non-contact Vital Sign Detectors," Proceedings of IEEE Radio and Wireless Symposium, pp. 281-284, Long Beach, January 9-11, 2007. (Best Student Paper Award in Second Place)
  32. C. Li, J. Lin, Y. Xiao, "Robust Overnight Monitoring of Human Vital Signs by a Non-contact Respiration and Heartbeat Detector," IEEE 28th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, pp. 2235-2238, New York City, Aug. 30 - Sept. 3, 2006.
  33. Y. Xiao, C. Li, J. Lin, "Accuracy of A Low-Power Ka-Band Non-Contact Heartbeat Detector Measured from Four Sides of A Human Body," IEEE MTT-S International Microwave Symposium Digest, pp. 1576-1579, San Francisco, June 11-16, 2006.

Patents

  1. USPTO Provisional Patent Application: Method and System of Canceling Random Body Movement Effect for Non-Contact Vital Sign Detection, filed on July 12, 2007. UF Invention Disclosure #12495, March 22, 2007.
  2. USPTO Provisional Patent Application US60/948,749: Wavelength Division Sensing Technique for Doppler Radar Vital Sign Monitoring and Mechanical Vibration Monitoring, filed on July 10, 2007. UF Invention Disclosure #12477, Feb. 27, 2007.
  3. USPTO Provisional Patent Application US60/941,128: Non-Contact Measurement System for Accurate Measurement of Frequency and Amplitude of Mechanical Vibration, filed on May 31, 2007. UF Invention Disclosure #12423, January 17, 2007.
  4. USPTO Provisional Patent Application 61/005,782: Complex Signal Demodulation and Angular Demodulation for Non-contact Vital Sign Detection, filed on Dec. 7, 2007. UF Invention Disclosure #12734.

News Release

"Wireless Crib Monitor Keeps Tabs On Baby's Breathing"

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