Engineer Signal Processing
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Title:Member Research Staff
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HOTTEST SKILLS: communication, hmo, compression, engineer, dsp, computer engineer,
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REVISION: 08-SEP-02
RESUME:
NAME: RAJUGOPAL GUBBI
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RAJUGOPAL GUBBI
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OTTAWA ONTARIO CANADA, ST 00000
^613-***-**** 1948
******@***.********.**
I am a Ph.D. student at Carleton University, Ottawa, Canada and will
be graduating in Nov '96. My doctoral research is on "robust low bit
rate video communication over wireless ATM networks". This involved
research on error resilient video compression and dynamic channel
adaptation to combat the mobile channel variations.
My Masters thesis was on Speaker Recognition following which I worked
on low bit rate speech coders, transcoder and gateway between networks
at Central Research Laboratory, Bharat Electronics, India. This
involved problem identification and definition, research and
development, and technology transfer.
My current interests are in speech, image and video compression/
communication, internet speech/video, digital communication, wireless
communication, broadband/ATM networks and digital signal processing. I
will be interested in research and development oriented career.
If there is any suitable opening I wish to be considered. I am
attaching my resume to this mail for your reference. Please feel free
to contact me if you have any questions. Please acknowledge the
receipt of this mail.
Education:
Sept. 1993
- present Ph. D. (Systems and Computer Engineering)
Carleton University,
Ottawa, Canada Thesis: Robust Video Communication
over Wireless ATM Networks Expected date of defense: November, 1996
Supervisors: Prof. R. H. M. Hafez and Prof. S. A. Mahmoud
Abstract: This thesis is an investigation of a low complexity and high
performance universal video communication system for mobile (indoor or
outdoor) environment with an ATM backbone network. This work is on the
lines of upcoming MPEG-4 proposals that is being planned for future
systems. Channel and Bandwidth constraints in mobile environment limit
the achievable data rate. However, the end users demand good quality
video and would prefer gracefully degrading video quality with
decrease in available Bandwidth. The two main issues addressed are
video compression and channel adaptation with a stress on the low
complexity requirement of the system.
A good source coder is required to provide high compression gain and
gracefully degrading video quality with decrease in the available
Bandwidth. Also it is known that variable bit rate (VBR) source coders
outperform constant bit rate source coders under network transport
conditions. Hence it was chosen to investigate the combination of
wavelet transform, multi-resolution motion estimation and zerotree
coder for VBR video compression at low bit rates. Robust design of
zerotree coder is proposed to make the source coder error resistant
under hostile environment.
Two stages of channel coding are experimeted in combating fading in
mobile channel and cell loss in ATM channel. Unequal error protection
(UEP) is employed at the inner channel coding stage to better protect
the data of higher importance. Varying channel conditions demand
dynamically changing error protection for better use of bandwidth. A
source level rate controller is proposed to enable adaptation to the
channel conditions and to provide VBR video. The rate controller needs
to efficiently analyse the channel conditions and adjust the system
parameters for best performance. For this purpose, it is suggested to
sense the channel at the receiver and send it as feedback. This
information is further processed and used by the rate controller to
adapt the system. Outer channel coding is suggested to be as per the
standard air interface specifications such as in CODIT, DECT etc.
Robust design of source coder and dynamic channel adaptation of the
system with low overhead enables its application in a variety of
channel conditions like narrowband, broadband, indoor and outdoor.
Algorithm designs are tuned to minimize the computational complexity
of the system.
July 1988
- Jan 1990 Master of Technology Major: Communication
Systems
. Indian Institute of Technology, Madras, India. Thesis:
Speaker Recognition Techniques - A Study Supervisor: Prof. V. Venkata
Rao
June 1983
- Dec 1987 Bachelor of Engineering in Electronics and
Communication Engineering,
Mysore University, India.
Distinctions: - Epstein Award bestowed upon Outstanding Graduate
Students at Carleton University (Jan 1994). - Canadian Commonwealth
Fellowship from Aug, 1993 - present. - Gowri Memorial Award for the
paper, "Multi-channel All-Digital PCM-CVSD Transcoder".
Courses credited at Carleton University
:
Image Processing: - Principles and Applications of Morphological Image
Proc. A+ - Image Processing and Image Communication A+
Communication: - Stochastic Processes A- - Secure Communication and
Data Encryption A
Advanced courses in Communication Engineering: - Mobile Communication
Systems A
Courses on Communication and DSP were credited during Masters at IIT,
Madras, India.
Experience:
Feb 1990
- Aug 1993 Position: Member Research Staff Employer: Central
Research Lab, Bharat Electronics, Bangalore, India Area: Speech
communication Brief outline of experience: - Design and Development of
Low Bit-rate Speech Coders - Design and Development of Network level
Gateway - System Integration and testing - Project definition and
specification - Technology Transfer
Major Projects: - Development of a LPC-10E Based Speech Coder at
2.4Kbps. This coder was integrated with a parallel tone HF modem,
developed in-house. - Feasibility study and Design of 8Kbps CELP
speech coder for a satellite link. - Design and Development of a High
Quality 16kbps Speech Coder, using the basic structure of CVSD coder.
This coder is far superior to conventional CVSD due to its performance
over an input dynamic range of 50dB. - Design and Development of a
Gateway between two heterogeneous networks. One of the networks used
PCM and customized X.25, while the other one used CVSD and a
proprietary data protocol for speech and data communication. - Design
and Development of the system control unit and crypto synchronization
unit for a Data Encryption System.
Mar
- June 1988 Training on Personal Computer Technology at Hindustan
Computer Limited, Bangalore, India
.Technical skills: Prog. Languages: C++, C, FORTRAN, XLISP, Assembly
languages of TMS320C2x, TMS320C3x, ADSP-210x family DSPs Operating
Systems: Unix, MS-DOS Windows: Solaris, Open look Windows and
MS-Windows Software packages: Matlab, SPW (Signal Processing
Workstation)
Experience with Communication Test Instruments including: - Spectrum
Analyzer - Network Analyzer - Logic Analyzer - Signal generator, Power
and SNR measuring equipments
Publications:
Electrical and Computer Engineering, Halifax, Canada, Sept. 1994. 7.
G.R. Rajugopal and A. Paulraj, "Multi-channel All-Digital PCM-CVSD
Transcoder," IETE Journal, June 1993. 8. G.R. Rajugopal and A.
Paulraj, "All-Digital PCM-CVSD Transcoder," Indian Computing Congress
Conference,
Hyderabad, India, Dec 1991.
Fields of Interest: Multimedia; Speech, Image, Video and Data
communication, internet speech/video, Digital Communication, Wireless
Communication, Broadband/ATM Networks and Digital Signal Processing.
Extra-curricular: Music, Chess, Swimming (Life saving, Red Cross-Grey
level), Skating and Skiing.
References: Available upon request
Contact this candidate