RF Engineer
Resume:
PROFESSIONAL SUMMARY
Currently working as a Sr. research fellow with over ten years work experience in electrical engineering, focusing on design of RF/microwave components / transceivers / testbeds.
• Design & Optimization of RF/Microwave Components: Antenna/Array (compact, wideband), amplifier/LNA, RF filter, mixer, VCO, PLL, ADC/DAC, and RF control circuits, RF-BB interface, DSP, FPGA; EMC/EMI; EM simulation(HFSS, ADS, CST, IE3D)
• Design of Radio Systems: Transceivers/testbeds for SATCOM platform, Radar system, LMR, Cellular radio system, Soft-defined radio/Cognitive radio / GPS / GNSS; PCB design and layout, system integration and tuning, performance prediction and optimization, EMC/EMI, array application
• Design & Running of Wireless Networks: Cellular(GSM, CDMA, WiMAX, LTE), Satellite, Trunking, Public safety network (P25), Mesh, Ad-Hoc, WLAN; planning and optimization; RF field predicting and tuning, Link budget analysis, Array application, Interference measurement/tracking, Spectrum management, Power control, Scheduling, Routing, Security, and Throughput optimization
EDUCATION
• PhD (2005), Microwave Eng., Univ. of Electronic Science and Technology of China (UESTC)
• MS (2002), Electrical Eng., Chongqing Univ. of Posts and Telecomm.(CQUPT), China
• BS (1999), Electrical Eng., CQUPT
PROFESSIONAL EXPERIENCE
1. RF DEPART. (NJ, USA, 07-10/2009)
Sr. RF Engineer
• Design of high power microwave mechanical tuning filter/diplexer
• Design of fast hopping RF filters (PIN-diode, helical/coaxial, VHF/UHF) for military use
• Design of RF amplifier / antenna and digital control/sensor analog circuitry for aircraft use
• Design of SatCom RF distribution system, system test, link analysis and simulation
Primary Simulation & Validation Tools: HFSS, Genesis, Matlab, ADS & emulation platforms.
2. CENTER FOR ADVANCED COMMUNICATIONS (Villanova University, PA, USA, 09/2006-2010)
Sr. Electrical Scientist
• Design of multi-channel RF receiver, data collection and signal processing
• Design of RF IC (amplifier, filters, mixers, oscillator)
• R&D of antenna/array: novel antenna (compact/conformal/reconfigurable/wideband, for cell phone, UAV, satellite, aircrafts), performance optimization, non-uniform array, pattern synthesis, array calibration, mutual coupling mitigation, electronically scanned designs and optimization, test and simulation (HFSS, CST)
• R&D of cooperative/distributed networks/public safety networks: relay/distributed beamforming, relay selection, spatial-multiplexing, opportunistic selection, optimum power allocation, high throughput MAC, multi-beamforming, scheduling and routing
• R&D of radio signal processing: radio channel estimation, signal extraction/filtering/ fusion/identification, target detection/tracking/positioning, radar signal processing
• Software for wave propagation modeling in UAV systems (multipath, diversity, array application)
• Software for radio network optimization (scheduling, power allocation, parameter tuning)
3. RESEARCH & INNOVATION CENTER (Alcatel-Lucent, Shanghai, 07/2005-08/2006)
Radio Scientist
• Design of MIMO-OFDM WiMax Rx/Tx: general system design, RF block design and test, DSP+FPGA design, PA/antenna design, transceiver design and troubleshooting
• Software for MIMO-OFDM transceiver: synchronization, channel estimation (MMSE, LS), space-time coding/ decoding, power control algorithm design; field test
• R&D of 3G/LTE wireless network planning and optimization: frequency / code/capacity / topology/coverage planning, performance evaluation and optimization, cross-layer optimization
• R&D of distributed antenna wireless networks (DAWN) (proof-of-concept)
• R&D of radio-over-fiber (RoF) techniques (proof-of-concept)
• R&D of scheduling algorithms in wireless networks
• R&D of next-generation wireless backhaul solutions (proof-of-concept)
• R&D of soft-defined radio, cognitive radio and public safety networks (proof-of-concept)
Primary Simulation Tools: ADS and Matlab, channel simulator, NS-2, and OPNET.
4. UESTC (Chendu, 09/2002-07/2005)
Radio Scientist
• Design of antennas and arrays (patch, PIFA, yagi, bow-tie, LPDA, compact / conformal / reconfigurable / wideband), array synthesis, calibration, mutual coupling mitigation
• Design of RF filters (pseudo-elliptic), EMC / EMI filters
• Design of amplifiers (UHF) and other RF circuits
• Design of MIMO testbeds, system test, troubleshooting, field test, signal processing
• Design of algorithms for MIMO transceivers (space-time coding, channel estimation)
• Measurement of radio MIMO channels (indoor and outdoor), propagation prediction
• Design of radar imaging testbed: waveform design, GPR, calibration/alignment, target detection, identification, classification
• Software for electromagnetic modeling and simulation (CEM), Radar RCS prediction
Primary Simulation & Validation Tools: HFSS, CST, Matlab, FEKO, and ADS.
5. CENTER FOR MOBILE COMMUNICATIONS (CQUPT, Chongqing, 09/1995-07/2001)
Electrical Engineer
• Design of analog and digital circuits for RF IC, power electronics and cell phones (amplifiers, filters, mixers, ADC-DAC, MCU, DSP, and FPGA)
• Integration and troubleshooting of circuit systems
• Design of control software and hardware for electronic products
• Design of dual-mode cell phones (CDMA/GSM)
• Design of antennas for cell phones and other radio products
• Wireless network planning and optimization (GSM/CDMA/UMTS)
• Design of software for wave coverage prediction and link budget analysis
INVITED PROJECTS
a) SEEKON MICROWAVE COMMUNICATIONS INC. (Chengdu, 08-12/2002)
Electrical Scientist
• Design of high-power WCDMA BS duplexer/filters
• Design of GSM/CDMA repeater system
• Group leader
b) HOLLEY COMMUNICATIONS INC. (Hangzhou, 01-07/2002)
RF Engineer
• Design of RF Block (amplifier, mixer, & filter) for CDMA cell phone cooperated with several R&D branches at Vancouver in Canada and Dallas and San Diego in US
• Design of cell phone antennas (helix)
• Test of cell phones, field test
• Design of amplifiers for cell phones
• Design of power control algorithms for cell phone
Primary Simulation & Validation Tools: HFSS, ADS and hardware platform.
c) CHONGQING JINMEI COMMUNICATIONS INC. (Chongqing, 03/2001-01/2002)
Electrical Engineer
• Design of high-power electronic-tuning filters (cavity)
• Design of embedded software for e-filters (varactor, MCU)
Simulation & Validation Tools: HFSS and ADS
d) DATANG TELECOMMUNICATIONS TECHNOLOGY INC. (Beijing, 11/1999-04/2001)
Electrical Engineer
• Drafting and revising China’s 3G mobile communication standard (TD-SCDMA)
• Design of testbed for TD-SCDMA
• Design of dual mode demonstrator (TD-SCDMA/ GSM)
• Design and system integration of RF IC & transceiver (amplifier, mixer, filters, etc.)
• Measurement of 3G channels, field test
• 3G wireless network planning and optimization
• Design of power amplifiers for cell phone and base stations
Simulation Tools: ADS and Matlab
Soft/Tools
Professional use of HFSS, Matlab, CST, ADS, MWO, FEKO, Protel (PCB layout), C/C++, SQL, Perl, etc;
Professional use of signal generator, spectrum analyzer, network analyzer, oscilloscope, multimeter, etc.
Languages
Fluent in Chinese and English, basic knowledge of Japanese.
Patents
[P1] Zaiping. Nie and Xin. Li, Method and apparatus for designing and creating cross-coupling in filters, Chinese patent, No.200*********.X.
[P2] Zaiping. Nie, Xin. Li, Xiyu. Zhang, Base station diversity antenna apparatus for MIMO wireless communications, Chinese patent, No.200420060430.4.
[P3] Zaiping. Nie and Xin. Li, Diversity antenna apparatus for wireless communication terminals, Chinese patent, No.200420060429.1.
[P4] Zaiping. Nie and Xin. Li, Wearable diversity antenna apparatus for wireless communication terminals, Chinese patent, 200420060656.4.
[P5] Xin. Li, Filters with quasi-elliptic response, Chinese patent, No.ZL 03232707.2.
END
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