Vijay Raman
Graduate student
459 Coordinated Science Lab, 1308 West Main Street, Urbana IL 61801
E-mail: vraman3 at illinois.edu   

I am working on my Ph.D. in Electrical and Computer Engineering at the University of Illinois at Urbana-Champaign. My adviser is Prof. Nitin H. Vaidya and I am part of his Wireless Networking Group in the Coordinated Science Laboratory. My research interests include incorporating traffic awareness in wireless networks, building resource efficient wireless systems, and mobile computing.  


Home Education Experience Research Publications Awards & Honors

UPDATES

  • I have graduated and started working for Qualcomm. My dissertation can be accessed from here.

  • I interned at Qualcomm, Corporate R&D during the Summer 2011. I worked on indoor localization using femtocells.

  • Best Poster Award at ACM MobiSys, 2011 for our work on driver detection using smart phones, which I did at Duke University with Hon Lu, Jeff Shen, Dr. Aman Kansal, and Prof. Romit Roy.

  • Our WiSP protocol for reducing MAC overheads in wireless networks has been accepted to the IEEE SECON, 2011 conference.

  • I visited Duke University during Fall 2010 to work with Prof. Romit Roy Choudhry on an interesting problem involving mobile phone sensors.

  • Best Paper Award at the WWIC, 2010 for our SHORT protocol. (news article)


EDUCATION

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EXPERIENCE

[Jan. 2012 - Present] Senior Systems Engineer, Qualcomm. 

[Aug. 2006 - Dec. 2011] Research Assistant, Wireless Networking Group, Coordinated Science Laboratory, UIUC. 

[May 2011 - Aug. 2011] Interim Engineering Intern, Corporate R&D, Qualcomm. 

[Aug. 2010 - Dec. 2010] Visiting Research Assistant, Systems and Networking Research Group, Duke University. 

[Spring 2011] Teaching Assistant, ECE428/CS425/CSE424 - Distributed Systems. 

[Fall 2008] Teaching Assistant, ECE/CS 438 - Communication Networks. 

[Oct. 2004 - Jun. 2006] Software Engineer, Network Advance Technologies (NAT) Group, Motorola India Electronics Ltd. 

[Jun. 2004 - Oct. 2004] Programmer Analyst Trainee, Offer Framework Systems (OFS) division, Cognizant Technology Solutions Pvt. Ltd.

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RESEARCH

 Academic Research

    Thesis Research

  • Net-X - A testbed for multichannel, multi-interface, multi-hop wireless network
    - Work involves protocol and algorithm design, implementation on a Linux 2.4.26-based system, and measurements to demonstrate system performance.
    - Requires kernel programming and designing scripts for executing the experiments. - Working on algorithms and protocols based on spectrum management (width, power, rate, etc.) for performance improvement in multichannel wireless networks.
    - Developed a strategy for providing low-delay routes for delay sensitive applications over multichannel ad-hoc networks.
    - Proposed a channel allocation algorithm for minimizing adjacent channel interference effects.
    - Worked on protocols for provisioning QoS in multichannel wireless networks.
    Other non-thesis research
  • QoS Provisioning in Multichannel Wireless Networks through Spectrum-Width Adaptation
    - Course project for CS 598 - Internetworking with Prof. Matthew Caesar during Fall 2008.
    - Designed algorithms for routing, congestion control, and admission control with the notion of providing quality of service (QoS) in multichannel wireless networks.
    - Simulated the algorithm and demonstrated the performance improvement using AODV routing protocol.


  • Performance Evaluation of Broadcast Mechanism in Wireless Sensor Networks
    - Course project for CS 525 - Advanced Distributed Systems with Prof. Indranil Gupta during Spring 2007.
    - Studied the performance tradeoffs among various percolation-based broadcast mechanisms used in wireless sensor networks such as, flooding, site percolation-based gossiping, and bond percolation-based gossiping.
    - Analyzed and simulated the performance tradeoffs and discussed their relative choices for various sensor network applications such as, code updates, membership management, and query processing.

 Industrial Research (At Motorola)

  • 3GPP, WiMAX, IETF, and IEEE 802.21 Standards Development - Designed protocols for IP mobility and mobility management in mobile networks
  • with the IETF-NETLMM working group.
    - Worked on radio access network (RAN) architecture, IP provisioning, and location management for 3GPP LTE systems.
    - Contributed a mechanism for using candidate access router discovery for media independent handover services in IEEE 802.21.
    - Worked with the WiMAX network working group (NWG) on network functional decomposition and WiMAX system architecture.
    - Developed algorithms for improving the bandwidth request mechanism in IEEE 802.16e MAC.

  • Self Optimizing Radio Access Networks (SOR)
    - Worked on a simulator for optimizing RAN parameters such as, polarization, azimuth, and downtilt for IEEE 802.16e systems.
    - Simulator developed wholly in C, and used traces from actual cellular networks for evaluation.


  • CDMA 1x EVDO Performance Evaluation
    - Evaluated the performance of the dynamic location update mechanism used in CDMA 1x EVDO.
    - Analyzed and compared the performance benefits of a dynamic location update mechanism over a static approach used in GSM and CDMA 1x 2000 networks.

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PUBLICATIONS

 Journal Papers

  1. Vijay Raman and Indranil Gupta, ``Performance Tradeoffs Among Percolation-based Broadcast Protocols in Wireless Sensor Networks'', The International Journal of Parallel, Emergent, and Distributed Systems, February 2010.


 Conference Papers

  1. Vijay Raman and Nitin H. Vaidya, ``WiSP: A Protocol for Overcoming MAC Overheads Using Packet Size Dependent Channel Widths'', to appear in the proceedings of the IEEE SECON, 2011.


  2. Vijay Raman and Nitin H. Vaidya, ``SHORT: A Static-Hybrid Approach for Routing Real Time Applications over Multichannel, Multi-Radio Wireless Networks'', in the proceedings of the International Conference on Wired/Wireless Internet Communications, 2010. Recipient of the Best Paper Award.


  3. Vijay Raman and Matthew Caesar, ``A Practical Approach for Providing QoS in Multichannel Ad-Hoc Networks Using Spectrum Width Adaptation'', in the proceedings of the IEEE Globecom, 2009.


  4. Vijay Raman and Indranil Gupta, ``Performance Tradeoffs Among Percolation-based Broadcast Protocols in Wireless Sensor Networks'', in the proceedings of Workshop on Wireless Ad hoc and Sensor Networks (held in conjunction with ICDCS), 2009.[slides]


  5. Suresh Kalyanasundaram, Vinod Ramachandran, and Vijay Raman, ``Signaling Reduction in Idle Mode for Inter-Technology Mobility'', in the proceedings of the IEEE Vehicular Technology Conference, Spring 2007.


  6. Matt Dillon, Aniruddha Diwan, Chris Murphy, and Vijay Raman, ``Evaluating the Opportunity for Optimization of Various RF Parameters in IEEE 802.16e Multi-Cell Network '', in the proceeding of the IEEE Vehicular Technology Conference, Fall 2006.


  7. Rajeev Agrawal, Suresh Kalyanasundaram, Vinod Ramachandran, and Vijay Raman, ``Enhanced Distance-Based Location Update Mechanism'', published at the 3rd Motorola China Technology Symposium, May 2006.


  8. Suresh Kalyanasundaram, Vinod Ramachandran, and Vijay Raman, ``Signaling Reduction in Idle Mode for Inter-Technology Mobility'', published at the 3rd Motorola China Technology Symposium, May 2006.


  9. Vijay Raman and Suresh Kalyanasundaram, ``Performance Analysis of the Distance-Based Location Update Mechanism of CDMA 1x EV-DO'', in the proceedings of the IEEE Globecom Conference, December 2005.


 Technical Reports

  1. Vijay Raman, Fan Wu, and Nitin H. Vaidya, ``Overcoming MAC Overheads Using Packet Size Dependent Channel Widths'', Technical Report, November 2010.


  2. Fan Wu, Vijay Raman, and Nitin H. Vaidya, ``A Channel Assignment Algorithm for Opportunistic Routing in Multichannel, Multi-Radio Wireless Networks'', Technical Report, November 2010.


  3. Vijay Raman and Nitin H. Vaidya, ``A Static-Hybrid Approach for Providing Low Delay Routing for Real Time Applications'', Technical Report, August 2009.


  4. Vijay Raman and Nitin H. Vaidya, ``Adjacent Channel Interference Reduction in Multichannel Wireless Networks Using Intelligent Channel Allocation'', Technical Report, August 2009. [Older version: March 2009].


  5. Vijay Raman and Matthew C. Caesar, ``A Practical Approach for Providing QoS in Multichannel Ad-Hoc Networks using Spectrum Width Adaptation'', Illinois Research and Scholarship Technical Report, April 2009.


  6. Vijay Raman and Indranil Gupta, ``Performance Tradeoffs Among Percolation-based Broadcast Protocols in Wireless Sensor Networks'', Dept. of Computer Science Technical Report, April 2009.


 Posters and Demos

  1. Hon Lung Chu, Vijay Raman, Jeffrey Shen, Romit Roy Choudhury, Aman Kansal, and Victor Bahl, ``You Driving? Talk To You Later'', poster at ACM MobiSys, June 2011.[poster in ppt]. Recipient of the Best Poster Award.


  2. Vijay Raman, Fan Wu, Brian Proulx, and Nitin H. Vaidya, ``Overcoming MAC Overhead Using Packet-Size Dependent Channel Widths'', poster at IEEE SECON, June 2010.[poster in ppt]


  3. Vijay Raman and Nitin H. Vaidya, ``Routing Voice over Multichannel, Multi-Radio Wireless Networks'', poster and demo at ACM MobiSys, June 2010.[poster in ppt]


  4. Vijay Raman and Nitin H. Vaidya, ``Routing VoIP over Multichannel, Multi-Radio Wireless Networks'', poster and demo at Illinois Center for Wireless Systems Summer School, August 2009.[poster in ppt]


  5. Vijay Raman and Nitin H. Vaidya, ``Interference Aware Channel Allocation in a Multichannel, Multi-interface Wireless Network'', poster at WiNTECH (held in conjunction with MobiCom), September 2008.


  6. Rishi Bhardwaj, Chandrakanth Chereddi, Pradeep Kyasanur, Paul Roycroft, Nistha Tripathi, Vijay Raman, and Nitin H. Vaidya, ``Net-X: A Framework for Supporting Multiple Channels and Multiple Interfaces in a Wireless Network'', poster and demo at ACM MobiCom, September 2007.[poster in ppt]


  7. Rishi Bhardwaj, Chandrakanth Chereddi, Pradeep Kyasanur, Paul Roycroft, Nistha Tripathi, Vijay Raman, and Nitin H. Vaidya, ``Net-X: Framework for Multi-channel, Multi-interface Wireless Networks'', poster at Illinois Center for Wireless Systems (ICWS) Symposium, UIUC, September 2007.[poster in ppt, pdf]


 Standards Documents

  1. Vijay Raman, Anand Bedekar, Ajoy Singh, and Suresh Kalyanasundaram, ``A Proposal for a Requirement for IP Local Mobility'', IETF NETLMM Working Group internet draft, February 2006 (Expired on August 2006).


  2. Vijay Raman, Anand Bedekar, Ajoy Singh, and Suresh Kalyanasundaram, ``A Protocol for Network-based Local Mobility Management'', IETF NETLMM Working Group internet draft, February 2006 (Expired on August 2006).


  3. Ajoy Singh, Vivek Gupta, and Vijay Raman, ``CARD Protocol for 802.21 Information Service (IS)'',  IEEE 802.21 Media Independent Handover Services (MIH) project, January 2006.

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SELECTED AWARDS AND HONORS

  • Student Member, IEEE, since August 2007.

  • Won the ``Best Poster Award'' at the ACM MobiSys conference, in 2011.

  • Won the ``Best Paper Award'' at the WWIC conference, in 2010.

  • Awarded ``Level 1 Significant Participation'' standards award in recognition of significant contributions to key standards programs in IETF, 3GPP RAN 2/RAN 3, WiMAX Network Working Group at Motorola, in 2006.

  • Awarded the ``Bravo Award'' in recognition and appreciation of excellent contributions to projects undertaken, and two pursued patents at Motorola, in 2006.

  • Chosen as one of the top 10 innovators of Motorola India for the year 2005.

  • Awarded the Anna University Gold Medal, and several other endowments and prizes for academic excellence, in 2004.

  • Student Chairman, Electronics Engineers' Association (EEA), Madras Institute of Technology, 2003-2004.

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