Engineer Software

Name: Wuwen Li Address: Irvine, CA

E-mail: *******@****.*** Tel: 858-***-****

HIGHLIGHTS

** ***** ** ********** ** Bluetooth, CDMA/WCDMA modem design and implementation

** ***** ** ********** ** embedded C/C++ development in wireless communication

In-depth knowledge of various OS kernel source code and DSP, ARM processor SoC core

Good understanding of DSP and communication theory and broad knowledge in HW, SW and system

EXPERIENCE

January 2011– Present, UCLA Electrical Engineering Department

Advisor: Greg Pottie, Professor and Area Director, Signals and Systems

Research Project: A bandwidth and power dynamic reallocation algorithm for CDMA and OFDM network to achieve fair data rate for delay sensitive traffic flows.

October 2010 – January 2011, Trellisware Senior DSP SW Engineer

Cheatahnet radio DSP protocol stack software development debug

TI AAC audio codec, codec engine integration

November 2006 – Oct 2010, Bluetooth Firmware & System Design Group, Broadcom San Diego

Senior Staff Engineer

Bluetooth SBC codec firmware implementation

C model RTL bitmatching, FMRX audioPause FPGA implementation, FMRX rdsAGC performance fine tune

July 2001-- October 2006, DSP group, Nokia, San Diego

Senior design engineer

CDMA 2000 1X, EVDO DSP SW design & implementation

October 1999-- July 2001, WCDMA-DSP group, Nokia, Finland

DSP design engineer

Rake receiver DSP SW design & implementation

March 1999-- September 1999, CCC Mobile, Finland

Software engineer

IrDA communication driver SW development on Symbian based PDAs.

April 1998-- February 1999, Hitachi Semiconductor America, China Design Center

Software engineer and team lead

Cable modem MAC layer SW design & implementation

V.34 Software modem design and implementation

March 1997-- March 1998, Founder Information System Corporation, China

Software engineer

Email software RSA, IDEA, MD5 encryption SW module design & implementation

Banking system based on Informix database

ACCOMPLISHMENTS

Research project on design and simulate a hybrid resource reallocation algorithm for CDMA and OFDM network to achieve fairness between delay sensitivity traffic flows

In this research project, I designed and implemented 2 dimensional CDMA and OFDMA network simulation software using C++ and Boost library. The simulation software runs on UCLA ATS super computer. OpenMP and MPI are used for parallel computing to speed up simulation speed. A hybrid resource ( bandwidth & power ) reallocation algorithm is designed to balance the data rate among different traffic flows. The goal is to maintain the fairness among traffic flows and maximize network throughput. Flow rate is calculated based on interference level. Traffic flow arrival is modeled to follow Poisson distribution, flow average rate variance is computed as measurement of fairness. Two power control methods are implemented, they either base on channel gain or flow rate.

Bluetooth system design group: FM channel search algorithm design, FM rdsAGC performance optimization, FM audioPause C model and Verilog FPGA implementation

Worked on C model and Verilog implementation for different modules including FM channel search algorithm design and audioPause. C model and Verilog algorithm bit-matching, fix point DSP filter and RSSI filter characterization. Fine tuned rdsAGC parameter to improve its sensitivity. Coded Python scripts to use GPIB to control various lab equipments for system performance measurement and optimization.

Bluetooth firmeare group: physical layer firmware design, implementation, debug and patch

Implemented SBC decoder. Worked on dynamic CPU clock control, error dump module. Coded a perl script to parse the error dump. Worked on ROM firmware debugging and fixing bugs by ROM patch.

DSP SW for CDMA 1X EVDO forward traffic channel demodulation design & implementation

Designed and implemented DSP SW to decode forward traffic channel for all rates. Created design and tested specifications, and performed implementation and lab testing. The SW module had a state machine, which processed L1 protocol signaling messages and controlled ASIC blocks to decode receiving data that was modulated in PSK or QAM.

CDMA 1X MAHHO DSP SW design & implementation

Performed 1X MAHHO(Mobile Assistant Hard Handoff) feature requirement analysis. Designed and implemented DSP SW to realize the MAHHO feature. The SW module included a state machine, which processed protocol signaling messages, controlled RF and searcher HW blocks, and reported candidate frequency search result. Led an IOT team to test MAHHO in Lucent lab.

CDMA 1X DSP SW bug fixing, field performance improvement

Analyzed field test logs; improved system performance; corrected critical SW errors in time. The errors included: bus errors, TI silicon bug, out of memory errors, low throughput in high speed data in the field, and others. Matlab was used to plot different measurements done in the field for performance analysis. Perl was used to post process field trace data.

WCDMA rake receiver DSP algorithm and software design & implementation

Designed and implemented DSP SW module, which controlled various ASIC blocks, including: finger, combiner, and DLL. The SW module controlled physical channel setup and release, ran finger allocation and tracking algorithm, and performed soft handoff. TI DSP C55 was used in this project.

Cable Modem MAC layer protocol SW design & implementation

Performed requirement analysis based on DOCSIS standard. Designed MAC layer SW architecture. Led a team to implement Cable modem MAC layer SW on SH3 DSP processor and VxWorks.

V.34 Software modem design and implementation

Design & Implemented V.34 SW modem on SH3-DSP including training sequence detection and training, viterbi decoder.

Digital signature and data encryption algorithm implementation

Implemented RSA, IDEA, DES, MD5 in pascal and X86 assembly language for Email client software

EDUCATION

2011 – present, PhD UCLA in Signal Processing and Communication, pass Preliminary Exam

course work: Convex optimization, wireless communication, multimedia communication and network, matrix analysis, linear programming

2008 – 2010, M.S.EE UCLA in Signal Processing and Communication

1993 – 1997 B.S. in Computer Science, Central University for Nationalities, Beijing

SKILLS

Programming language:

X86, ARM7 and TI DSP assembly language, matlab, C/C++, perl, python, Verilog, Ruby, SQL

Software and development tools:

modelsim, VCS, Verdi, Cadence icfb, make, GPIB programming, Boost library, OpenMP, MPI for parallel computing, Lapack, Blas, Umfpack, Git, VxWorks, OSE, Linux, ThreadX, MySql

Test equipments:

spectrum analyzer, logic analyzer, realview debugger

PUBLICATIONS

1. Virus 'Mulint' and Anti-Tracing Method of Reverse Instruction Flow, PC World, May 1996.

Contact this candidate