System Engineer Resume

SUMMARY:

A Challenging position in Wireless Digital Communication System and DSP Algorithmin which will utilize the strength of analytical problem solving.

SKILLS:

Programming: C, C++ in Video Studio, Visual C++, DSP Assembly language in OakMOTOROLA 56301, TI.

Software: SPW( Signal Processing Workstation ), ClearCase, ClearQuest, WindowsMatlab, Simulink, etc..

STANDARDS: IS136, GSM/EDGE, IS95, IS2000, Confidential, WCDMA, Confidential (Satellite WCDMA), WLAN, WiMAX, LTE.

KEY WORDS: DSP, WIRELESS SYSTEM, CDMA, TDMA, UMTS, OFDM, 3GPP, 3GPP2, 3G, 4G.

WORK EXPERIENCE:

Confidential

System Engineer

Responsibilities:

General Dynamics C4 Systems
Analysis on system architectures, definitions, requirements, specificationsalgorithms, system integration, testing, and verifications of Confidential
UE mobile satellite communication system.
Simulated and implemented rake receiver system and algorithms such as acquisitioncell search, path search, finger management, timing tracking and slew, channel estimation, frequency tracking and compensation loop.
Modeled and verified baseband power control subsystem and digital radio control loop.
Research on OFDM wireless system such as WLAN 802.11b, WiMAX and LTE.

Leader and Staff DSP System Engineer

Confidential

Responsibilities:

Developed a new type internet wireless modem and PCMCIA card (OMAP core) for Confidential Standard.
Supervised product layer1 algorithm development and implementation such as sync acquisition search, timing track, AGC, handoff.
Wrote C55 TI chip driver for DSP controller to set IF and RF configuration to control multiple - carrier frequency, gain and power.
Participated and supported in product field trail.

Staff DSP Algorithm and System Integration Engineer

Confidential

Responsibilities:

Developed the DSP software algorithm, specification, implementation, physical layer(L1) system analysis and integration in digital cellular standard such as Time Division Multiple Access (TDMA) system GSM, IS136 and Code Division Multiple Access (CDMA) IS95, IS2000 and UMTS.
Investigated acoustic signal processing (ASP) algorithm included DTMF/tone generation, volume control, Sidetone generation, AEC (acoustic echo cancellation), NLES (non-linear echo suppression), VAD (voice activity detection), DTD (Double talk detection) and audio codec integration.
Worked voice code data compression/decompression algorithm development (VSELP for TDMA, QCELP 13k and 8k for CDMA ) from float point C code to fixed point DSP C code, then to assembly DSP code by Visual C++ and Oak DSP processor.
Responsible for DSP assembly code development in channel code, Viterbi decode and data error creation on Motorola 56301. Built SPW simulation system to test DSP software.
Designed CDMA digital baseband OQPSK/QPSK modem to develop modulation and demodulation algorithm such as fine timing, coarse timing, channel estimate and compensation, symbol combination, AGC, DC offset, AFC, soft handoff, open and close loop power control.
Wrote layer 1 host interface code to link DSP and ARM subsystem.
Integrated and verified the whole baseband system both TX and RX included layer 1 DSP subsystem and Layer 2/3 embedded ARM subsystem under PCS and cellular band with the true handset device, platform board, HP mobile station test set, HP spectrum analyzer, RF channel simulator, noise generator, ARM breaker interface, workbench, HP hyper-terminal displayer, oscilloscope. Responsible for overall system test strategy and plan, minimum CDMA functional verification.
Finished field-test the whole baseband system RF interface with the Qualcomm and Mitel solutions in Spring wireless network operator.

Research Assistant

Confidential, Wichita, Kansas

Responsibilities:

Simulated coded modulation and demodulation systems (M-PSK, M-FSK, M-QAM, M PAM) by programming.
Analyzed zero-crossing baseband digital demodulator under static and fading channel with frequency offset.

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