PH. D. Candidate

Coordinated Science Laboratory (CSL)

University of Illinois at Urbana-Champaign (UIUC)

Contact: jwchoi at illinois.edu

Jun Won Choi received the B.S. and M.S. degree in Electrical and Computer Engineering from the Seoul National University (SNU), in 2000 and 2002, respectively.  He is currently pursuing Ph. D. degree in Electrical and Computer Engineering (ECE), University of Illinois at Urbana Champaign. His research interests include signal processing for wireless/underwater communications, statistical signal processing, and low-power DSP system design.

- Curriculum vitae

RESEARCH INTERESTS

• Signal processing for communications, Wireless communication, Underwater acoustic communication

• Iterative (Turbo) MIMO detection, Low-complexity MAP/ML decoding, Factor graph & Message passing algorithm, Multi-user MIMO, Sphere decoding, Turbo equalization and SISO channel estimation, Sparse channel sensing

• Signal analysis/reconstricution, Stochastic estimation/detection, Adaptive filter theory

• Statistical estimation/detection, Compressed sensing, Graph-based inference algorithm, Adaptive noise/echo cancellation

• Low-power signal processing system design

• Algorithmic Error-tolerant DSP algorithm, Dynamic voltage scaling, Soft error cancellation

PUBLICATION

• JOURNAL

1. J. W. Choi, K. Kim, T. J. Riedl, A. C. Singer, and J. C. Preisig, "Adaptive linear  turbo equalization (ALTEQ) of very long channel responses;  practical receiver design and experimental results," in preparation.

2. J. W. Choi, B. Shim, J. K. Nelson, and A. C. Singer, "Efficient soft-input soft-output detection via improved $M$-algorithm," in preparation

3. J. W. Choi, B. Shim, A. C. Singer, and N. I. Cho, "A low complexity near-ML decoding via reduced dimension maximum likelihood search," accepter for publication in IEEE Trans. on Signal Processing.

4. J. W. Choi, A. C. Singer, J. W. Lee, and N. I. Cho, "Improved linear soft-input soft-output detection via soft feedback interference cancellation," accepted for publication in IEEE Trans. on Communication

5. J. W. Choi, B. Shim, A. C. Singer, and N. I. Cho, "Low-power filtering via minimum power soft error cancellation (MP-SEC)," IEEE Trans. on Signal Processing, vol. 55, pp. 5084-5096, Oct. 2007.

6. J. W. Choi and N. I. Cho, "Suppression of narrow-band interference in DS-spread spectrum systems using adaptive IIR notch filter," Signal Processing, vol. 82, pp. 2003-2013, Dec. 2002.

• CONFERENCE

1. J. W. Choi, B. Shim, J. K. Nelson, and A. C. Singer, "Efficient soft-input soft-output MIMO detection via improved $M$-algorithm," submitted to ICC 2010.

2. K. Kim, J. W. Choi, and A. C. Singer, "A new adaptive turbo equalization with soft information classification," submitted to ICASSP 2010.

3. J. W. Choi, T. J. Riedl, K. Kim, A. C. Singer, and J. C. Preisig, "Practical application of turbo equalization to underwater acoustic communications," submitted to ICASSP 2010.

4. J. W. Choi, B. Shim, and A. C. Singer, "Near-ML detection over a reduced dimension hypersphere," accepted for Globecom 2009.

5. T. J. Riedl, J. W. Choi, and A. C. Singer, "Channel estimation by inference on Gaussian Markov random fields," accepted for Asilomar Conference 2009.

6. J. W. Choi, K. Kim, T. J. Riedl, and A. C. Singer, "Iterative estimation of sparse and doubly-selective multi-input multi-output (MIMO) channel," accepted for Asilomar Conference 2009.

7. B. Shim, J. W. Choi, I. Kang, "Towards the performance of ML and the complexity of MMSE - A Hybrid approach," IEEE Globecom 2008, Nov. 2008, pp. 1-5.

8. J. W. Choi, R. J. Drost, A. C. Singer, and J. C. Preisig, "Iterative multi-channel equalization and decoding for high frequency underwater acoustic communications," IEEE SAM 2008, July 2008, pp. 127-130.

9. J. W. Choi, B. Shim, A. C. Singer, and N. I. Cho, "A low-complexity near-ML decoding technique via reduced dimension list stack algorithm (RD-LSA)," IEEE Sensor Array and Multi-channel Signal Processing Workshop (SAM) 2008, July 2008, pp. 41-44.

10. J. W. Choi, A. C. Singer, J. W. Lee, and N. I. Cho, "An improved soft feedback V-BLAST detection technique for TURBO-MIMO systems," IEEE ICASSP 2008, March 2008, pp. 3181-3184.

11. J. W. Choi, A. C. Singer, and N. I. Cho, "Low-power adaptive FIR equalizer via soft error cancellation," IEEE ICASSP 2006,  May 2006, pp. 14-19.

12. J. W. Choi, B. Shim, A. C. Singer, N. I. Cho, "Energy-efficient digital filtering using ML-based error correction (ML-EC) technique,"  IEEE ICASSP 2005,  Mar. 2005, pp. 18-23.

13. J. W. Choi and N. I. Cho, "Narrow-band interference suppression in direct sequence spread spectrum systems using a lattice IIR notch filter," IEEE International Conference on Acoustics, Speech and Signal Processing Conference (ICASSP 2001),  May 2001, pp. 2237-2240.

• Research Assistant, Univ. of Illinois at Urbana-Champaign, Urbana, IL

• Computationally efficient ML/MAP tree decoding algorithm

• Efficient iterative MIMO/MIMO-OFDM detection

• High speed underwater acoustic communications

• Low-power signal processing system design

• Research Assistant, Seoul National Univ.

• Narrow-band interference suppression for CDMA systems (funded by LG Electronics Inc.)
  

WORKING EXPERIENCE

• Summer intern, Corp R&D in Qualcomm Inc., San Diego, CA, summer, 2008

• 3GPP2 LTE system design - Design of PHICH multi-user detector, 

• Summer intern, Intersymbol Communications Inc., (merged by Finisar Inc. in 2006), Champaign, IL, summer, 2005

• Optical channel emulator development

• Low-power MLSE-enhanced CDR (carrier and data recovery) for 10G optical receiver

TEACHING

• Full-time Instructor, University of Illinois at Urbana-Champaign

• Digital Signal Processing I (ECE 416), Summer, 2009

PATENT

1. J. W. Choi, Hyung Il Koo and Nam Ik Cho, "Method and apparatus for signal discrimination," filed through Samsung Electronics, Nov. 2003 (U.S Patent, No. 2557-000203/US).