Engineer Assistant
Resume:
Jun NIU
Cell: 201-***-****
North Arlington, New Jersey 07031 E-mail:
***.***@*******-******.***
***.***@*****.***
Work Status: Permanent Resident
QUALIFICATION
. In-depth knowledge of LTE standards: PHY, MAC, RLC, PDCP, RRC, RRM,
MME, mobility, radio control, admission control and OA&M functions;
CDMA, HSPA cellular systems, WiMax, 802.11e/D
. Strong knowledge of physical layer techniques: MIMO, OFDM, Single
carrier-FDMA, Spectrum Spread, Carrier Frequency Offset, IQ imbalance
compensation, RF Calibration, Channel Coding, Channel Estimation
. Capable of wireless system modeling, analysis and test in both C/C++,
MATLAB
. Four years experiences with Digital Signal Processing: Real-time
Embedded System, FFT, Digital Filter Design, TI DSP TMS320
. Strong lab skills: experienced with lab equipments including
oscilloscopes, power supplies, signal generator, spectrum analyzers,
power meter and digital multi-meters.
. In-depth knowledge of mathematic modeling: stochastic process,
statistical analysis, mathematical optimization, differential
equations, queuing system
. Programming: C/C++, QT, MFC, C#, WPF, ASP.net, JAVA, SQLServer,
Oracle, PLSQL, Perl/ Shell Scripting, MATLAB, Assembly language
. Others: Multithreading, Socket Communications, TCP/IP, UDP, RTP, RTCP,
RTSP, wireless LANs, Ad-Hoc network, Video over IP.
EXPERIENCE
07/2010 ~ present Alcatel-Lucent IODT Lab. New Jersey
System Integration and Validation Engineer
. System validation and testing: Full stack, mobility and feature tests
with band13 LG G13 UEs and band4/17 Qualcomm UEs: Closed-loop MIMO,
Open-loop MIMO, Transmit diversity; Downlink and Uplink
(bidirectional) throughput(TCP, UDP); Ciphering and integrity
protection, Inter-frequency cell reselection; Intra LTE Inter-eNodeB
Intraband/Interband Inter-frequency/Intra-frequency handover, Intra-
eNodeB intra-frequency handover, Inter-frequency/intra-frequency S1
handover; measurementGAP management; Up to 4 simultaneous dedicated
bearers per user; Fractional power control; Group hopping; Automatic
Neighbor Relation, Dynamic system control; MAC DRX, OCNS on PDCCH,
Enhanced SW capacity; audio, video and data transmissions.
. Configure eNodeB databases and RF grids; Analyze and debugging the
failed test cases by looking into the logs in both UE and eNodeB
sides, check messages and data flows between UE and eNodeB, eNode and
MME, locate the issues and write test reports.
. Test tools: XMS, SAM, WIPS, NEM, LLDM, QXDM, QPST, QMI connection
manager, Wireshark, SANJOLE WaveJudge/IntelliJudge, Agilent MXA Signal
Analyzer.
02/2010 ~ 06/2010 PharmaSeq, Inc. Monmouth Jct. New Jersey
Consultant, System engineer
. RFID algorithms design and applications in medical device:
. Code MTreader reading and robot movement control with C++.
. GUI design and system control with C#, WPF for Autoloader flow system.
08/2008 ~ 08/2009 Wireless Network Lab, Beijing University of Posts and
Telecommunications, China
Visitor scholar
. Worked on LTE advanced: collaborative MIMO based on multi-BS
cooperations, reducing inter-cell interferences, coordinated
multipoint transmission/relay for diversity gains, dynamic spectrum
access/CRN
. Baseband board development for LTE testset in C and X86 assembly
language
. LTE radio and UE test: security, power control, handover, etc.
. System Architecture Evolution: radio interfaces and user plane
security development in C++, C# and MATLAB.
07/2006 ~ 04/2008 InterDigital Communications, LLC, Melville, NY
Technical consultant
. Working on 3GPP Long Term Evolution (LTE) MIMO Advanced Receivers:
(1) I proposed new lattice-reduction-based MIMO receivers and ordered-
tree-expansion ML soft solutions. Existing sphere decoding algorithms
exhibit two major weaknesses: their complexity is closely associated
with initial radius choice, and the variance of their computation
times can also be large, leading to undesirable highly variable
decoding delays. To overcome these shortcomings, I proposed ordered
tree traversal algorithm (OTT) to avoid the usage of initial radius
and decrease the number of nodes visited during the search process.
OTT is neither depth first search nor breath first search. The
corresponding metric for tree expansion is the accumulated Euclidean
distance along the edges from root node to child node. I studied the
complexity of OTT and LSD by comparing the number of leaf nodes
obtained and all nodes explored during the search for target
candidates. OTT has much less time complexity, as it only investigates
the necessary leaf nodes.
(2) Comparison of MMSE-SIC and DSMC based on performance and
implementation considerations with
IRC,
- Squared versus magnitude Euclidian Distance (ED)
- Sorting
- For 2x2 MIMO (Rank 2): Mandatory for UE category 1 - 4
- For 4x4 MIMO (Rank 4): Mandatory only for UE category 5
. Involved in OFDM Frequency Offset and IQ Imbalance Compensation
Project: estimate and compensate the CFO and I/Q imbalance in OFDM
receivers. A high-resolution virtual carrier based algorithm is used
for estimating CFO in the presence of I/Q imbalance. After correcting
the CFO, I/Q imbalance is estimated using virtual carriers. The
virtual carrier based CFO estimation algorithm is robust in the
presence of I/Q imbalance.
. RF and baseband LTE test: MIMO test, Spectrum, Symbol Constellation,
Phase Error versus Time, Frequency Error versus Time, Integrated Phase
Noise, I/Q Imbalance (Amplitude, Phase), network emulation for
L1/L2/L3 uplink and downlink via RF or digital baseband.
. System simulations and GUI desgin in C++, C #, WPF, and MATLAB for
3GPP Long Term Evolution (LTE) MIMO Advanced Receivers, which utilize
template, multithreading programming and tree search algorithms, like
BFS, DFS, etc,.
. Signal generation, modulation and demodulation, symbol and frequency
synchronization in OFDM Frequency Offset and IQ Imbalance Compensation
Project. All these are implemented in C++, C# and MATLAB.
08/2003 ~ 06/2008 Polytechnic University, Brooklyn, NY
Research Assistant & Teaching Assistant
. Applied a new lattice reduction algorithm, Seysen's method, to MIMO
systems. Compared with the existing LLL method, the distribution by
Seysen's algorithm is more even than that by LLL's. This more smooth
correlation distribution leads to less bit error rate in the linear
detection of MIMO system. Seysen's algorithm can achieve BER
performance improvement over LLL's with less computational complexity,
which is measured by the average number of column operations required
for lattice reduction before converge. This advantage will be more
apparent for MIMO systems with more transmit and receive antennas, and
for high modulation constellations
. About three MIMO downlink precoding techniques: Tomlinson-Harashima
Precoding, Dirty Paper Coding and Vector Perturbation, despite the
different expressions of them, I derived that these three precoding
schemes can essentially be represented in the same mathematic
expression. I also presented two vector perturbation strategies:
sphere decoding based VP and lattice reduction based VP. Among them,
sphere decoding based VP has optimal solution, but at the cost of
computation complexity; lattice reduction based VP provides a
suboptimal result in a simple and efficient way.
. Researched new time-frequency cooperative communications strategy in
block fading channel for LTE system: both the uplink coded SC-FDMA
systems and downlink coded OFDMA systems. The new schemes have
advantages over direct transmission by exploiting time diversity,
space diversity (due to multiuser cooperation), frequency diversity
and coding gain.
. LTE radio resource algorithms: scheduler, power control, interference
cancellation, resource management, mobile managements
. Instruct communication theory lab: signal generator, spectrum
analyzers, power meter and digital multi-meters.
08/2002 ~ 07/2003 Stevens Institute of Technology, Hoboken, NJ
Teaching Assistant
. Teach Circuits & Systems Lab: Operational Amplifiers, filters, Speech
Capture/Playback, etc,.
. Design Real-Time Digital Signal Processing Project: TI TMS320C6000
Board Programming
05/2000 ~ 08/2002 Multimedia Communications Center, Beijing University of
Posts and Telecommunications, China (BUPT)
Research Assitant
. Developed End-to-End Congestion Control and Adaptive QoS of IP Video
Streaming
. Implemented and Socket communications in C++, TCP/IP, MPEG4, H.263
08/1997 ~ 03/2000 Xidian University, Xian, China
Research Assistant
. Responsible for the design and development Signal and Video Processing
for Target Shooting
. Implemented Network and Socket Programming
08/1996 ~ 07/1997 Computer Networks Center, Ocean University of China,
China
Network Engineer
. Campus Network/Systems test, debugging and analysis
. Implemented BGP, OSPF, IGRP, EIGRP, MPLS, IP, ATM, routing and routed
protocols on Cisco routers
EDUCATION
08/2003 ~ 06/2008 M.S & Ph.D. Electrical & Computer Engineering
Polytechnic University, Brooklyn, New York
08/1997 ~ 03/2000 M. Eng. Electrical & Computer Engineering
Xidian University, China
08/1992 ~ 07/1996 B.S.E.E. Electrical & Computer Engineering
Ocean University of China, Qingdao, China
PUBLICATIONS
1. "Ordered Tree Traversal Algorithm for MIMO Advanced Receivers ",
submitted to IEEE Communication Letters.
2. "Coded Cooperative Communications for OFDM and SC-FDMA Systems",
submitted to IEEE Communication Letters.
3. "Unification of Tomlinson-Harashima Precoding, Dirty Paper Coding and
Vector Perturbation ", in the Proceedings of CEWIT, Oct, 2008.
4. "A Comparison of Two Lattice-Reduction-Based Receivers for MIMO
Systems ", in the Proceedings of IEEE Sarnoff, Princeton, April 28-30,
2008.
5. "Coded Cooperation on Block-Fading Channel in Single-Carrier FDMA
systems", in the Proceedings of IEEE GLOBECOM 2007, Washington, DC,
November 26-30, 2007.
6. "A New Lattice-Reduction-Aided Receiver for MIMO Systems", in the
Proceedings of the 41st Annual Conference on Information Sciences and
Systems (CISS'07), The Johns Hopkins University, Baltimore, MD, March
14-16, 2007
7. "Coded Cooperation with Time/Frequency and Multiuser Diversity over
OFDMA systems", in the Proceedings of CEWIT, Jan, 2007
8. "Coded Cooperation with Maximum Diversity gain on Block-Fading Channel
in OFDMA systems", in the Proceedings of IEEE WCNC, 2007
9. "Coded Cooperation in OFDMA Systems," in the Proceedings of the 40th
Annual Conference on Information Sciences and Systems (CISS'06),
Princeton University, Princeton, NJ, March 22-24, 2006
10. "ML-Based Estimator for Integer Frequency Offset Estimation of OFDM
systems," Third Annual Wireless Telecommunications Symposium. (WTS
2004)
AWARDS
. CATT Research Fellowship, Polytechnic University, Brooklyn, NY, 2004
. WICAT Research Fellowship, Polytechnic University, Brooklyn, NY, 2005-
2007
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