Assistant Engineer

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XI CHEN

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Room 3209, Coover Hall

Dept. of Electrical & Computer Engineering

Iowa State University

Ames, IA 50010

Citizenship: P.R. China with F-1 visa

Phone: 626-***-****

********@*******.***

http://home.eng.iastate.edu/~leon6827

OBJECTIVE

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Full-time jobs in wireless networking, embedded software

development or related areas.

EDUCATION

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Ph.D. Computer Engineering, Iowa State University, Oct. 2010 (Expected)

- Monor in Economics

B.S. Electrical Engineering, University of Science and Technology of China (USTC), July 2006

COMPUTER SKILLS

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Tools: NS-2, OPNET, Qualnet, Matlab, Pspice

Languages: C/C++, Java, Perl, Tcl, nesC, SystemC/SpecC, Keil C

Platforms: MICA motes, Stargate linux box, Madwifi driver

Networking: 802.11 WLAN, 802.15.4 ZigBee, 802.16 WiMAX, LTE/LTE-A, TCP/IP

RESEARCH EXPERIENCE

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Research Assistant, Since Fall 2006

Dr. Daji Qiao, ECE Dept. of Iowa State Univ.

* Fast Handoff scheme with null dwell time for wireless LANs.

- Proposed handoff scheme in the purpose of reducing the handoff delay as well as making more

appropriate handoff decisions by utilizing the communication backbone.

- Implemented the scheme in Madwifi driver and demonstrated its effectiveness via experiments.

* Rate adaptation mechanism for wireless LANs.

- Proposed scheme to track the channel variation in a timely manner in mobile environments.

- Implementation with system level modifications in Madwifi device driver and Linux kernel.

- Simulated in NS-2, and compared all the existing schemes we are aware of.

* Resource management in multi-radio multi-channel mesh networks.

- Formulated it as a joint routing and channel assignment problem with practical considerations.

- Solved the problem using CPLEX and evaluated the scheme with extensive Qualnet simulations.

* Location privacy in ad-hoc localization system.

- Devised a novel scheme to protect location privacy of anchor nodes.

- Analyzed the security level of our scheme mathematically.

- Simulated our scheme with nesC program in Embedded OS TinyOS.

INTERNSHIP

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Research Engineer Aug. 2009 – Jan. 2010

ALcatel-Lucent Research & Innovation Lab at Shanghai

* Focusing on LTE/LTE-A system level modeling and simulation:

- System level modeling of scenario deployment, adaptive MCS, CC/IR HARQ, DL MIMO (closed loop),

DL Co-MIMO as well as related MAC scheduling and simulation acceleration techniques.

- Implementation of the above modules in OPNET 10.5.A.

- Calibration with the results from other companies as well as internal results from other groups.

Research Staff June--Sept. 2005

Dr. Guangyou Fang Beijing, Chinese Academy of Science

* Focus on image processing. Using multi-resolution analysis and edge-following algorithms

to propose new detection algorithm, which is used to detect horizons on Sub-bottom Images.

PROJECTS & DEMOS

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* goGarcia (Crossbow-MICA motes, Stargate linux box, Laptop).

goGarcia is a sensor-surveillance and robot-navigation real-time distributed system based

on a heterogeneous network: underlying sensor networks using xbow-MICA motes and Wi-Fi. My

work was designing and implementing the sensing and communication framework incorporating

wireless sensors, base station and Garcia custom robot (mounted with a Stargate and WLAN

card).The sensor network will sense and report the location of a triggered event to the

based station. The base station then calculates the route and sends out navigation commands

to the Intel-Stargate Linux box on Garcia robot, which calls TEA module to control the

movement.

* Java RMI and CORBA projects (C++ and JAVA).

These two projects are done in the course of Distributed Systems and Middleware. The Java

RMI Chatroom supports multiple chatrooms each with multiple clients. Client remotely call

the procedure resided in server side to obtain a list of existing chatrooms. The CORBA auction

system is similar to ebay, and provides bidding and selling functions as well as banking

function support.

* sBlink (Crossbow-MICA motes, embedded TinyOS).

This is a distributed, self-organizing and self-healing application. In sBlink, every MICA

node blinks one by one with a duration of one second between blinkings based on their orders

of joining the network. sBlink needs to handle the events of multiple nodes!/ joining and

leaving, as well as message collision problems.

* 76ers Robot (Intel 8051 Chipset, Motor Control).

76ers is the name of the robot we designed in the Robot Competition held by USTC in 2005.

The goal in the competition is to pick up as many balls as possible and carry them to the

center platform, as well as to handle collisions with other robots. We designed and made the

robot (mechanics, electronics and software) all by our own.

* Designed a randomized linear time algorithm to find the median of a massive data set (consisting of

over 40 million integers). The algorithm aimed to use sampling technology to identify a short

interval that contained the median of the data set, so that the median could be found efficiently.

* Designed a music player using system level methodology in SpecC/SystemC language, and made further

refinements in System-On-Chip Environment (SCE) tools.

* Implemented the JPEG encoding and decoding processes using VC++ and MFC.

* Simulated the triangulation algorithm and the DV-Hop positioning scheme for ad-hoc networks in TOSSIM.

TEACHING EXPERIENCE

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Teaching Assistant, EE 201 Electric Circuits, Iowa State University, Spring 2008

Teaching Assistant, CprE 543 Wireless Network Architecture, Iowa State University, Fall 2007

SELECTED COURSEWORK

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Advanced Communications

Computer Systems Performance

Advanced Protocols and Network Security

Probabilistic Methods in Computer Engineering

Wireless Network Architecture

Pervasive Computing

Random Processes for Communications

Distributed System and Middleware

Wireless Sensor Networks

Wireless Network Security

Embedded System Design

PUBLICATIONS

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Sunggeun Jin, Xi Chen, Daji Qiao and Sunghyun Choi, "Adaptive Sleep Mode Management in IEEE

802.16m Wireless Metropolitan Area Networks," submitted to Elsevier Computer Networks (ComNet)

Special Issue on Mobile WiMAX.

Xi Chen, Prateek Gangwal and Daji Qiao, "RAM: Rate Adaptation in Mobile Environments"

submitted to IEEE Transaction on Mobile Computing.

Xi Chen, and Daji Qiao, "HaND: Fast Handoff with Null Dwell Time for IEEE 802.11 Networks"

to appear in Proc. of IEEE Conference on Computer Communications

(InfoCom) Acceptance ratio = 17%, San Diego, CA, March 2010.

Xi Chen, Prateek Gangwal and Daji Qiao, "Practical Rate Adaptation in Mobile Environments"

in Proc. of IEEE International Conference on Pervasive Computing and Communications

(PerCom) Acceptance ratio = 13%, Galveston, TX, March 2009.

Wei Zhou, Xi Chen, and Daji Qiao

"Practical Routing and Channel Assignment Scheme for Mesh Networks with Directional Antennas"

in Proc. of IEEE International Conference on Communications (ICC), Beijing, China, May 2008.

Xi Chen and Daji Qiao, "Probabilistic-based Rate Adaptation for IEEE 802.11 WLANs"

in Proc. of IEEE Global Communications (GlobeCom), Washington D.C., Nov. 2007.

Xi Chen, Ka Yang and Daji Qiao, "Preserving Beacon Node Location Privacy in Ad-hoc Networks"

Technical Report.

SERVICES

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Treasurer, Iowa State University Chinese Soccer Club, since 2006

IEEE Student Member, Reviewer of ICC, ICCCN, Transaction on Wireless Communication (TWC)

Technical Staff, University Library, University of Sci. & Tech. of China, 2004--2006

Vice president of Sports Club, School of Information Sci. & Tech., USTC, 2004--2006

HONORS & AWARDS

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NSF Student Travel Grant (PerCom'09)

Professional Advancement Grant, Iowa State University, 2007, 2008, 2009, 2010

Undergraduate Research Award, University of Sci. & Tech. of China, 2005

Winner of the Paper Contest on Electromagnetic, University of Sci. & Tech. of China, 2003

Outstanding Student Scholarship, University of Sci. & Tech. of China, 2002, 2003, 2004, 2005

REFERENCES

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Available upon request.

Contact this candidate