Objective

Looking for meaningful and interesting stuff. I recently (Nov. 24 2011) started a blog at http://www.koobehub.com/ Hope I can keep it up...

Introduction

I was a PhD student with Rubinetat the Department of Electrical and Computer Engineering of University of California, Davis. I have a minor in computer science.

I have graduated in May 2010

Resume

(Due to the resume must be concise myth, my website in fact provides more information :-) Especially my Misc page. ) It has all my non-work projects.

Contact

Email: mailto:xyzliu@ucdavis.edu

Phone: 530-219-2879

Interests

I have experience and interests in the following fields, keywords are in bold:

• IaaS, cloud computing and data center virtualization used to be my myth hot words... Now I work on them
• Multimedia transport in telecommunication networks for example UMTS and GPRS. Peer-to-peer networking in local wireless networks. Applications of technological advances, for example Network Coding, cooperation in communication;
• Web applications, mobile applications design and development. I have always loved the way that the web and mobility has changed people's life, and wonder how it continues to make further impact.
• Signal processing, cooperative communication in cellular networks and its corresponding detection techniques;
• Efficient channel utilization of WLAN for multimedia transport.

Experience

• Summer Intern, (May 2009-Aug. 2009) @ Applied Research and Technology Center @ Motorola.
• Graduate Research Assistant, (July 2007-present) @ RubiNet @ ECE @ UC Davis.
• Teaching Assistant & Graduate Research Assistant, (Sept. 2005-June 2007) @ Electrical Engineering @ SUNY Buffalo.
• Graduate Research Assistant, (Sept. 2003-July 2005) @ PCN&CAD Center @ Computer Engineering @ BUPT.
• Software Co-op, (Jan. 2004-June 2005) @ Beijing Guodu Inc., Beijing, China.

Non-work Related Projects, Software/System Development & Interests

I have hands-on experience in the following fields: (Project details can be found at Misc )

• Web application design and development. Major projects are:

1. Personal Information Management (PIM) system for mobile users to manage personal information in online servers. Various methods are available for users' easy access to the information: Synchronization Markup Language (SyncML), WAP, short message (SMS), Web, Desktop client etc. Major technologies involved: J2EE, Database design, Java, XML
2. SyncML application server. The SyncML protocol is implemented to synchronize data between mobile devices and application servers located online. Major technologies involved: J2EE, Database design, Java, XML, Java design patterns
3. Facebook application Millionaire. The application incorporates online gaming and advertisements. Major technologies involved: J2EE, Database design, MySQL, Java, XML, Facebook APIs, HTML, Javascript, JSP

• WLAN related video streaming

1. Dynamic channel selection for video streaming in WLAN. In short, access points (AP) dynamically decides the best channel for video streaming with STAs and switches to the best channel seamlessly. Major technologies involved: MadWifi driver development, Linux scripting, user space program, C, Java

• Mobile applications

1. Android application development. Download available here Major technologies involved: Android platform, Java, multithreading
2. Cellular phone based J2ME Email system. Major technologies involved: J2ME, multithreading

• Simulation platform

1. Simulation platform for multimedia packet recovery using peer-to-peer technologies. Major technologies involved: QualNet, C++
2. Simulation platform for Push-to-Talk Over Cellular (PoC) OPNET, C++
3. Simulation platform for cooperative communications. Matlab

Publications

Journal

1. X. Liu, G. Cheung, and C-N. Chuah, “Structured Network Coding and Cooperative Wireless Ad-hoc Peer-to-Peer Repair for WWAN Video Broadcast”, accepted to IEEE Transactions on Multimedia, Jan. 2009.
2. X. Liu, G. Cheung, and C-N. Chuah, “Practical Joint Source/Channel Coding of WWAN Multicast Video for A Cooperative Peer-to-Peer Collective using Network Coding”, submitted to IEEE Trans. on Circuits and Systems for Video Technology, Oct. 2009.

Conference

• Enhance video quality in strong interference environment in WLAN by smartly utilizing spectrum resources (channels).

1. X. Liu and G. Calcev, “Channel Pool Management for Video Streaming in WLAN”, accepted to WoWMoM 2010.

• Enhance multimedia delivery QoS in cellular networks, for example in MBMS services.

1. X. Liu, G. Cheung, C-N. Chuah, and Yusheng ji, “Optimal Bit Allocation of WWAN Scalable H.264 Video Multicast to A Cooperative Peer-to-Peer Collective”, ICASSP 2010 Special Session on “cooperative media communication”.
2. X. Liu, G. Cheung, and C-N. Chuah, “Joint Source/Channel Coding of WWAN Multicast Video for A Cooperative Peer-to-Peer Collective using Structured Network Coding”, International Workshop on Multimedia Signal Processing, 2009. (Top 10% award)
3. X. Liu, G. Cheung, and C-N. Chuah, “Structured Network Coding and Cooperative Local Peer-to-Peer Repair for MBMS Video Streaming”, 2008 International Workshop on Multimedia Signal Processing, Cairns, Queensland, Australia, Oct. 2008.
4. X. Liu, G. Cheung, and C-N. Chuah, “Rate-distortion Optimized Network Coding for Cooperative Video Stream Repair in Wireless Peer-to-Peer Networks”, 1st IEEE Workshop on Mobile Video Delivery, Newport Beach, CA, June 2008.
5. X. Liu, S. Raza, C-N. Chuah, G. Cheung, "Network Coding Based Cooperative Peer-to-Peer Repair in Wireless Ad-Hoc Networks", ICC 2008, Beijing, China, May 2008.

• Improve physical layer BER performance by utilizing cooperative communication in cellular network

1. X. Liu and W. Su, “BER Analysis of the Optimum Receiver for Decode-and-Forward Cooperative Protocol”, vol.3, pp 485-488, ICASSP 2007.
2. X. Liu and W. Su, “Optimum Selection Relaying Protocols in Cooperative Wireless Networks”, pp 1-5, Globecom 2006.

• OFDM related

1. X. Jin, X. Liu, B. Chen, J. Song, “New Scheme for PAPR Reduction in OFDM Systems”, Future Telecommunication Conference 2003, Beijing, 2003.

• Web application and computer supported cooperative work (CSCW)

1. X. Liu, M. Song, X. Zhan, J. Song, “Use Case of SyncML in Mobile CSCW System”, The 6th international conference on Computer-Aided Industrial Design & Conceptual Design(CAID&CD), Holand, 2005.