Systems Engineer_LTE_WCDMA

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- JAEYOUNG KWAK -

- 119 Briarcliff Dr., Morganville, NJ 07751. -

_ (cell) 201-***-**** E-mail: **********@*****.*** -

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OBJECTIVE:

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Seeking a challenging position that can utilize my extensive experiences and knowledge in research and development for advanced wireless systems, including LTE, WCDMA, TD-SCDMA, and IEEE802.xx, during 9+ years after Ph.D.

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SUMMARY OF QUALIFICATIONS:

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-9+ years of research and development experiences for advanced wireless systems after PhD.

-Extensive knowledge and hands-on experiences on current wireless standards such as LTE (SC-FDMA and MIMO-OFDM, OFDMA), WCDMA, TD-SCDMA, IEEE802.xx, etc.

-Have an experience on a full product development cycle from algorithm development and analysis to conducting hardware implementation for mentioned wireless standard development.

-Intensive experience in algorithm invention, analysis, and development, simulation set-up and analysis for various link-level studies, generation of various test plans, strong programming skill (Matlab, C, C++), strong tool experience (Coware,SPW, OPNET) and efficient architecture analysis (computational complexity analysis and gate analysis)

-Thorough knowledge in the areas of digital communications theory, coding theory, advanced signal processing techniques, Multi-user detection, MIMO communication, space-time coding, cooperative communication, and cross-layer design.

-Expert at analyzing and solving the most complex problems

-Able to provide technical leadership and exceptional interpersonal and communication

skills with a dedication to promoting effective teamwork

-Patents: 4 US patents are issued, 6 US patents are pending and 3 applications are under preparation.

-Award: 2005 IDC CTO Strategic Inventing Award at InterDigital Communication

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Keywords: 3GPP, wireless LAN, UMTS, LTE, WCDMA, 802.xx, MIMO, OFDM, OFDMA, SC-FDMA, Space-time coding, SDMA, WiMAX, R&D, Systems Engineer, wireless communication, physical layer, MAC layer, product development, project management

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PROFESSIONAL EXPERIENCES:

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1/02-Present: Sr. Staff Engineer in Air Interface-RF System Department,

InterDigital Communications (IDC)

-3GPP LTE system development:

-Review various tdocs and follow LTE standard for physical and MAC layers. Also, involved in the generation of tdocs for IDC standard teams.

-Propose and develop low complex linear receivers by using MMSE and QR-MLD and a successive interference cancellation receiver for low complexity and low latency by using the pipeline structure for downlink MIMO-OFDM.

-Develop and implement channel estimation algorithm and MMSE equalizer in downlink MIMO-OFDM for floating and fixed point design

-Study and research on various transmit diversity methods, multi-user MIMO-OFDM, cooperative MIMO, and receivers for SC-FDMA.

-Research projects in CTO office for future company roadmap:

-Conduct a research with universities for future advance receiver design

-Evaluate and research on independent component analysis algorithm and a linear conjugate linear approach for an advanced receiver in the current and future wireless systems (GSM, WCDMA, MIMO-OFDM)

-Made the proposal about a future MIMO-OFDM wireless system to get the government R&D fund.

-MIMO HSPA system development for Release 7 FDD-WCDMA in 3GPP:

-As a member of core team, research on various MIMO CDMA receivers and follow Release 7 standards. Also, provide efficient MIMO HSPA receiver algorithms and architecture and perform the computational complexity analysis. Successfully, with a team, provide IDC's release 7 solutions.

-Propose and develop frequency domain MIMO MMSE-CLE algorithm in multi-cell environment, SIR estimation algorithm for CQI bit generation and novel STTD solution for R7 MIMO HSPA

-conduct a joint research project for MIMO HSPA with Polytechnic University.

-As a component leader for MIMO HSPA receiver, generate the algorithm description document and conduct various WG4 tests for the proposed receiver and fixed-point design.

-Generate the simulation model to efficiently obtain the block error rate from raw bit error rate and it is currently applied for other standard system development in IDC.

-Wireless LAN system development and standard contribution for IEEE 802.11n:

-With core algorithm team members, successfully, generate IDC's partial MAC and physical layer proposal for IEEE802.11n standard body in August, 2004. In the proposal, I provide the MIMO-OFDM receiver algorithms and architecture using linear pre-coding and SFBC.

-As a leader, develop MIMO-OFDM link-level test bench in Matlab to support standard activities of IDC in TGNSync group.

-Research and evaluate on various low complex adaptive MIMO-OFDM receivers, various space-time coding schemes, cooperative MIMO and its application and cross-layer design for physical and Mac layers.

-3GPP FDD-WCDMA system development project for Release 4 and 5 (HSDPA)

with General Dynamics, Phillips, and Infineon:

-As a member of a core algorithm team, research on RAKE receiver and various advanced receiver algorithms and perform the complexity analysis for hardware implementation to define the receiver architecture with team. Also, review tdocs and support IDC standard team to generate contributions in FDD-WCDMA standard of 3GPP. In results, IDC successfully deliver our solutions to our clients on time.

-Provide algorithms for channel weight generation, speed estimation, SIR estimation for TPC bit generation, and inner loop power control mechanism (TPC bit generation and min/max power detection algorithm for wind-up effect.

-In the Release 4 implementation side, as a component team leader for RAKE receiver, generate its test plan and design description document and conduct its fixed-point design, with team members.

-For HSDPA, research and evaluate various chip level equalizers (CLE) such as frequency domain CLE, adaptive MOE, adaptive normalized LMS to mitigate inter-cell interference.

-For HSDPA, also involved in the development of CQI generation and Hybrid ARQ mechanism.

-For WG4 standard, contribute the simulation assumption for inter-cell interference at the cell edge and the related various performance studies for type3 and type3i receiver in HSDPA

-3GPP TDD-WCDMA system development project with Nokia:

-As a member of a core algorithm team, research on various efficient joint detection algorithms and perform complexity analysis for hardware implementation to define the receiver architecture with team. Also, involved all the activity to support our standard team for physical layer issues in TDD-WCDMA standard of 3GPP. Our efforts let IDC successfully generate TDD-WCDMA physical layer solution.

-To reduce the complexity of a joint detection, provide various efficient solutions for channel estimation and joint detection such as FFT-based channel estimation algorithm, frequency-domain joint detection algorithm using prime-factor algorithm, efficient successive interference cancellation algorithm, etc. In specific, the freq. domain joint detection algorithm can reduce the computational complexities by 1/3.

-To remove sampling time error, provide fractional spaced joint detection algorithm. This structure is adapted to all of CDMA receiver development in IDC, later.

-To improve the performance of the joint detection, provide the blind code detection algorithm to detect channelization codes in the downlink.

-In the implementation side, as a component leader for the joint detection receiver, generate its test plan and design description document and conduct its fixed-point design.

-Modify joint detection algorithms and perform their complexity analysis to generate the solution for TD-SCDMA of China and Low Chip Rate TDD-WCDMA in 3GPP

4/01-12/01: Research Scientist in Applied Research, Telcordia Technologies (BellCore)

-MIMO-OFDM project for future wireless communication system with DARPA:

-Propose receiver architecture by using space-time multi-level coded modulation for multiuser MIMO-OFDM system.

-Research on space time coding, specifically, space-time block code and space-time trellis code.

-Investigate the effect of the multi-user detection on the multicasting routing algorithm.

10/99-4/01: Sr. Systems Engineer in Core Tech Dept., InterDigital Communications (IDC)

-3GPP TDD-WCDMA system development project for NOKIA:

-Provide the joint detection algorithm for transmit and receive diversity using a block linear equalizer

-Contribute the main receiver algorithm and its architecture to generate the first link-level test bench of TDD-WCDMA at IDC and generate its algorithm design description document.

-Review various tdocs and generate contributions related to physical layer issue

for TDD-WCDMA standard in 3GPP

6/98-9/98: Summer Intern (Supervisor: Dr. Dan Avidor), Crawford Hill Lab, Lucent Technologies

-Research on optimum weight vector design algorithm for a smart antenna system of the base station in the downlink, based on uplink resources, in the Fixed Wireless Local Loop.

1/94-10/99: Research Fellow (PhD student) in Polytechnic University (Advisor: Dr. I-Tai Lu)

-Propose and develop a blind adaptive space-time multi-user transceiver scheme using smart antennas for CDMA and MC-CDMA.

-Developed a novel high-resolution algorithm for complex-direction search of radio propagation in a wideband cellular/PCS and in acoustics environments.

EDUCATION:

-PhD in Electrical Engineering, Polytechnic University, Brooklyn, NY

Thesis: Novel blind adaptive space-time multiuser detection schemes for DS-CDMA systems

-MS in Electrical Engineering, Northwestern University, Evanston, IL

Thesis: Motion estimation algorithm using skeletons

-BS in Electronics and Computer Engineering, Korea University, Seoul, S. Korea

SKILLS:

-Programming: C/C++, DSP/Assembly

-Operating Systems: UNIX, Solaris, WinNT, winXP, and WinVista

-Proficient in Coware,SPW, OPNET, MATLAB, Simulink, Mathematica, Mathcad, and Maple

PUBLICATIONS:

Patents Issued and Published:

-US 7,483,475 Efficient joint detection

-US 7,289,552 Efficient joint detection

-US 7,463,694 Groupwise successive interference cancellation for block transmission with reception diversity

-US 7,266,168 Groupwise successive interference cancellation for block transmission with reception diversity

-200******** (Pub) Method and apparatus for deriving a combined transmit power control command during handover

-200******** (Pub) Method and apparatus for combining space-frequency block coding, spatial multiplexing and beamforming in a MIMO-OFDM system

-200******** (Pub) Method and apparatus for estimating channelization codes in a wireless transmit/receive unit

-200******** (Pub) Method and apparatus for implementing space frequency block coding in an orthogonal frequency division multiplexing wireless communication system

-200******** (Pub) Method and apparatus to improve channel quality for use in wireless communications systems with multiple-input multiple-output (MIMO) antennas

-200******** (Pub) Method and apparatus for reducing multi-user processing in wireless communication systems

Paper:

[1] J. Kwak and et. al., "Efficient Frequency-domain MIMO chip level equalizer for

HSPA in multi-cell environment,?under preparation to submit to IEEE Signal

Processing Letters.

[2] I-Tai Lu and J. Kwak, "A High-Resolution Algorithm for Complex-Spectrum Search,"published in the Journal of the Acoustical Society of America, Vol. 104(1), July 1998.

[3] J. Pan, J. Kwak, and et. al, "Complexity and Efficiency of Data Detection Algorithms for TD-SCDMA," published in PIMRC 2004, Barcelona, Spain, Sept. 2004.

[4] I-Tai Lu and J. Kwak, "Adaptive Blind Channel Estimation for Multi-user Detection in DS-CDMA systems," presented in IEEE Int. Conf. GLOBECOM'99, Rio de Janeiro, Brazil, Dec. 1999.

[5] J. Kwak and I-Tai Lu, "Blind Adaptive Space-Time Receiving and Transmitting Diversities for Multiuser DS-CDMA systems," presented in IEEE Military Communications Conference (MILCOM'99),

Atlantic City, NJ, Oct.1999.

[6] J. Kwak and I-Tai Lu, "A Blind Space-Time Adaptive Multi-user Detector For DS-CDMA Communication systems," presented in IEEE International Conference on Communications (ICC'98), Atlanta, GA, Aug. 1998.

[7] J. Kwak and I-Tai Lu, "Adaptive Blind 2D Rake Receiver for Multi-user Detection," presented in IEEE Vehicle Technology Conference (VTC'98), Ottawa, Canada, May 1998.

[8] I-Tai Lu and J. Kwak, "Complex-Direction Search of Radio Propagation in Microcells,"presented in IEEE APS/URSI Symposium, Baltimore, Maryland, 1996.

OTHER ACTIVIES:

-Act as a reviewer for IEEE vehicular technology conference (VTC), 2006.

-Member of IEEE and IEEE standard association.

VISA STATUS: Holding a green card

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