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Tiffany Jing Li
    P. C. Rossin Assistant Professor
      Dept of Electrical & Computer Engineering
      Lehigh University, Bethlehem, PA 18015
      jingli AT ece.lehigh.edu
      tel: 610-758-3305, fax: 610-758-6279

In this page   More Information (Research, Teaching)


A Short Biography
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Tiffany Jing Li received the B.S. degree in computer science from Peking University (Beijing University), Beijing, China, the masters and Ph.D. degree in electrical engineering from Texas A&M University, College Station, in 1997, 1999, and 2002, respectively. Her graduate advisors are Professor Krishna Narayanan and Professor Costas Georghiades. She spent the summer of 2000 and 2001 with Seagate Research, Pittsburgh, PA, and with Tyco Communications Laboratories, Eatontown, NJ, conducting coding research for magnetic recording systems and long-haul fiber optical communication systems. After obtaining her Ph.D. degree, she joined the Electrical and Computer Engineering Department at Lehigh University where she now holds P. C. Rossin College Assistant Professorship.

Her research interests fall in the general areas of coding and communication theory, wireless communications and networks, free-space optical and fiber optical communications, and digital data recording systems. Her recent reserach focuses include turbo/LDPC/TPC codes and iterative decoding, distributed source coding and joint source-channel coding, user cooperation and network coding, and wireless ad-hoc and sensory networks.

Dr. Li is an associate editor for IEEE Communications Letters. She served as the Symposium Co-Chair for the Signal Processing Symposium in 2005 IEEE Global Communications Conference (GLOBECOM) and the Signal Processing for Communications Symposium in 2005 IEEE WirelessCom. She received many awards in research, academic performance and mathematics and physics competitions, including the Ethel Ashworth-Tsutsui Memorial Award for Research in 2001 for "demonstrating excellence in research at Texas A&M University", the Peking University Outstanding Honors Science Student Award in 1997, the Chinese Academy of Science Striving Scholarship from 1994 to 1997, the candidacyship and third place prize in the '93 Chinese Mathematics Olympiad (CMO), and the first place prize in both '92 Chinese National Mathematics Competition for High School Students and '92 Chinese National Physics Competition for High School Students (Zhejiang Province).

Research Outlines
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  Current Research Group:
  • Meng Yu (Ph.D)
  • Ruiyuan Hu (Ph.D)
  • Hend Alqamzi (Ph.D)
  • Xingkai Bao (Ph.D)
  • Peiyu Tan (Ph.D)
  • Kai Xie (Ph.D.)
  • Nattakan Puttarak (M.S.)
  • Phisan Kaewprapha (M.S.)
  • Arpit Mehta (M.S.)
Former Students:
  • Ramesh Viswanathan (M.S.)

Research Support:
  • National Science Foundation (NSF)
  • Army Research Laboratory (ARL)
  • Seagate Technology
  • Pennsylvania State

Capacity-approaching error correction coding schemes:
  • Turbo Codes and parallel/serial/hybrid concatenated convolutional codes (PCCC/SCCC/HCCC)
  • Low Density Parity Check (LDPC) Codes
  • Turbo Product Codes (TPC) based on parity check codes
  • Product Accumulate (PA) codes and Generalized Product Accumulate (GPA) codes
  • Interleaver design and analysis
Distributed Source Coding (DSC):
  • Slepian-Wolf coding, Wyner-Ziv quantization
  • Multi-resolution binning and rate-adaptive DSC, error-resilient DSC
  Wireless Ad-hoc and Sensor Networks
  • Routing, Network coding, and joint source/channel/network coding
  • User cooperation (cooperative PHY) and relay networks
  • Node scheduling, clustering and power management
  Wireless communications:
  • High-performance coding schemes for Rayleigh fading channels
  • Pairwise error probability (PEP) and ML bounds for Rayleigh channels
  • Density evolution for Rayleigh channels
  Optical fiber communications:
  • Bandwith- and power-efficient coding for Chi-square, asymmetric Gaussian and symmetric Gaussian channels
  • Perofmance bounds, error floors and Reed-solomon wrapping
  • Channel capacity of optical fiber channels with soft- and hard-decision
  Digital data storage systems:
  • Iterative decoding and equalization (IDE) for ideal partial response (PR) channel models and Lorentzian channel models
  • Density evolution for inter-symbol interference (ISI) channels
  • Precoding for inter-symbol interference (ISI) channels
Here is more on Jing's Research ...
 
Courses I Am Teaching
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Spring 2007, Spring 2006 ECE 108 Signals and Systems (4 credit hours)
  • Continuous and discrete signal and system descriptions using signal space and transform representations. Includes continuous and discrete Fourier series, continuous and discrete Fourier transforms, Laplace transforms, and z-transforms. Introduction to sampling.
Fall 2005 ECE 342 Communication Theory
  • A first course in communications, either at a senior level or at a first-year graduate level, this course provides an introduction to the basic principles in the design and analysis of modern communication systems. We intend to cover both analog communication systems and digital communication systems, with emphasis on the latter. The topics include: signal analysis and transmission, analog communication systems (analog modulation), and digital communication systems (A/D conversion, source encoding, channel encoding, digital modulation, detection and estimation).
Spring 2003, Spring 2004, Fall 2006 ECE 432 Turbo Codes and Iterative Decoding
  • Capacity-approaching error correcting codes. Turbo principle and fundamentals of soft-in soft-out (SISO) iterative decoding. Turbo codes (parallel/serial/hybrid concatenated convolutional codes) and turbo-like codes. Iterative decoding algorithms and performance analysis of parallel/serial turbo codes. Low density parity check (LDPC) codes, code graph and message passing decoding algorithms. LDPC code design and construction. Performance analysis using density evolution and extrinsic information transfer (EXIT) charts. Applications of turbo and LDPC codes.
Fall 2003, Spring 2006 ECE 431 Spread Spectrum and CDMA
  • fading and despersive channel model, direct sequence spread spectrum, frequency hopping spread spectrum, DS-CDMA, FH-CDMA, spread sequence and their properties, multi-user detection, PN code acquisition, wireless communications systems, industrial standards (IS-95, WCDMA, CDMA2000).
Fall 2004 ECE 411 Information Theory
  • Information measures for discrete and continuous spaces (you will probably miss this part and hence need to learn by yourself), rate-distortion theorem, lossless and lossy compression methords (source coding), channel capacity, radom coding error exponent and random coding theorems, basic channel coding methords, joint source-channel coding and sepearation theorem.
Spring 2005 ECE 450 Network Information Theory
  • This advanced graduate course covers several topics in network information theory and multi-terminal communications. The topics include: Maximum entropy and Burg's Theorem. Information theory and statistics. Method of types. Stein's Lemma. Distributed source coding. Broadcast channel. Multiple access channel. Relay channel and cooperative networks. Network flow and network coding.
List of Publications
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Journal:
  • J. Li, Y. Cai, K. R. Narayanan, A. Lucero, A. Pilipetskii, and C. N. Georghiades, "On the Bit Error Rate of Product Accumulate Codes in Optical Fiber Communications," to appear IEEE/OSA Journal of Lightwave Technology, Dec. 2003.
  • J. Li, K. R. Narayanan, and C. N. Georghiades, "Product Accumulate Codes: A Class of Capacity-Approaching, Low-Complexity Codes," to appear IEEE Transaction on Information Theory, Jan. 2004.
  • J. Li, K. R. Narayanan, E. Kurtas, and C. N. Georghiades, "On the Performance of High-Rate TPC/SPC Codes and LDPC Codes over Partial Response Channels," IEEE Transaction on Communications, vol. 50, no. 5, pp 723-734, May 2002
  • J. Li, E. Kurtas, K. R. Narayanan, and C. N. Georghiades, "On the Performance of Turbo Product Codes over Partial Response Channels," IEEE Transaction on Magnetics, vol. 47, no. 4, pp. 1932-1934, July 2001
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Contact: jingli@ece.lehigh.edu
Last updated: Dec 2002