California Institute of Technology,
PhD in Electrical Engineering
California Institute of Technology,
MS in Electrical Engineering (GPA: 3.9/4)
GPA: 9.76/10 (2nd in the entire graduating class)
Senior Technical Staff Member at AT&T Research (Wireless Systems Division) (2001-02)
· Lead major investigation on analysis and characterization of orthogonality factor, an important parameter in WCDMA downlinks. Results have significant implications on downlink capacity.
· Part of a team that significantly improved an in-house WCDMA simulator, furthering internal research and potential external commercialization. Conducted a thorough system level study of WCDMA downlink channels capacity, shedding light on pertinent design and analysis issues.
· Successfully implemented simulation engine - currently possessed by few companies worldwide - for the advanced and comprehensive COST259 general channel model, with promising research applications. Participating in 3GPP channel modeling standardization efforts.
· Novel study of interplay between fast scheduling diversity and multipath channel diversity, and its impact on receiver design. Problem formulation has scope for promising future work.
PhD Research (1997-2000)
· Primary focus on characterizing effect of terminal mobility and wireless channel impairments on cellular resource allocation schemes.
· Analyzed the effect of channel estimate reliability on proposed link adaptation schemes in 2.5G EDGE systems, leading to interesting insights on a proposed no-transmission mode.
· Analyzed the effect of terminal mobility, channel, and interference on the hybrid voice/data Packet Reservation Multiple Access protocol. Analytical technique developed extends the range of problems that can be exactly analyzed.
Research partly done while at
Undergraduate Research Project (1995-96)
Designed, built, and successfully demonstrated hardware for Transcoder to
double existing capacity of lines between exchanges in rural
o Project required implementing complex hardware design, FPGA digital logic design, assembly code architecture and implementation for system control, synchronization, and monitoring. Hardware involved 8 ADSP21xx running in parallel for simultaneously compressing and decompressing 22 voice channels.
· Recipient of AT&T World Leadership Award given to 36 graduates from Asia/Pacific region. (1997)
Awarded the Philips India prize for best undergraduate academic
performance in Electronics and Communications Engineering, IIT,
Secured 17th all
· Secured 2nd rank (out of 40,000 candidates) in state’s engineering entrance exam (EAMCET). (1992)
Recipient of National Talent
Search Scholarship (NTSE,
· Stood 1st in state level Mathematics Olympiad. (1991)
· Languages: C, HTML, Pascal. Coded extensively in assembly languages of ADSP 21xx, x86.
· Mathematical software: Matlab, Mathematica, Maple, OrCad.
· Operating Systems: UNIX, Windows/DOS.
· Avid outdoors enthusiast.
· Enjoy Indian and Western classical music.
· Teaching Assistant at Caltech for basic/advanced communications, wireless courses. (1996-98)
· House chair of Braun Graduate House (Caltech). Initiated re-cycling program in dorm. (1998-99)
Undergraduate Representative for Electronics and
Participated in ecology management program for controlling non-native
plants at IIT,
“Analysis and Results for the Orthogonality Factor in WCDMA
“Characterizing the Orthogonality Factor in WCDMA Downlinks,”
“Statistics of the Orthogonality Factor in COST259 Macrocells for
“Clustering of Scatterers in
· “Some Performance Results for Downlink Shared Channel in WCDMA,” X. Qiu, L.-F. Cheng, L. Greenstein, Z. Kostic, T. Willis, K. Chawla, J. Chuang, J. Whitehead, N. Mehta. ICC 2002.
“Analysis and Design Results for Packet Data Traffic
Performance in WCDMA Downlinks,”
Diversity and Its Impact on CDMA Rake Receivers Exploiting Multipath Channel
“Throughput Analysis of Link Adaptation in Interference-Limited
“Performance Analysis of Link
Adaptation in Wireless Data Networks,”
“Effect of Fixed and
Interference-induced Packet Error Probability on PRMA,”
“Effect of Mobility on PRMA,”
“Prediction-based Techniques for Hand-off Prioritization in Channel