Rajesh Krishnamachari

Rajesh Krishnamachari

Summary

Established, through my Ph.D. research, a new paradigm of finite-rate feedback analysis of multi-antenna wireless systems based on insights from Riemannian geometry and random matrix theory.Earlier during my industrial work experience, I have participated in the complete feature development cycle - right from conception, design and planning to implementation and testing in the Telecommunications industry.Starting June 2011, I seek a position in industry that not only utilizes my prior background knowledge or skills, but also challenges and inspires me to learn new areas and grow in new directions.

Specialties(*) In-depth knowledge of both theoretical and practical aspects of communication systems.(*) Employing state-of-art mathematical theories to solve practical engineering problems.(*) Wide array of software skills.

Work History

Work History
Jul 2004 - Dec 2005

Engineer

Cambridge Silicon Radio (formerly, UbiNetics)

Embedded systems design and implementation for wireless protocol stack for a wide array of standards: GSM (2G) / GPRS (2.5G) / EDGE (2.75G) / UMTS (3G) / HSDPA (3.5G).Project List:1. Addition of 3.5G HSDPA/HSUPA support to UMTS Layer One Simulator.2. Development of a Multimode Layer One Simulator covering both UMTS and GSM AS.3. Design and implementation of 3G UMTS (based on Wideband CDMA) Layer One Simulator.4. Addition of 2.75G EDGE (EGPRS) support to GSM/GPRS Layer One Simulator.5. Enhancements to GSM/GPRS Layer One Simulator for several features including Access procedures and Measurement reporting.

Jun 2003 - Jun 2004

Engineer, R & D

Tejas Networks

Embedded Applications development for high-end Add-drop multiplexers for the optical communication standards SONET / SDH.Project List:1. Engineering Orderwire for STM-16 (or 2.5 Gbps) Add-Drop Multiplexer (Phone call implementation over an Optical Network).2. Full-duplex omnibus calling on STM-16 level ADM including Echo-cancellation procedures using a TI DSP.

Education

Education
Jan 2009 - Present

Doctor of Philosophy

University of Colorado - Boulder

Conference Publications C6. "Finite-Rate Feedback of Input Covariance Matrices in MIMO Systems", ISIT 2010 C5. "Interference Alignment Under Limited Feedback for MIMO Interference Channels", ISIT 2010 C4. "Distortion-Rate Tradeoff of a Source Uniformly Distributed over the Composite P_F(N) and the Composite Stiefel Manifolds", ISIT 2009 C3. "Distortion-Rate Tradeoff of a Source Uniformly Distributed over Postive Semi-Definite Matrices", Asilomar 2008 C2. "Volume of geodesic balls in the real Stiefel manifold", Allerton 2008 C1. "Volume of geodesic balls in the real Stiefel manifold", CISS 2008 Journal Publications J3. “Quantization over the Stiefel manifold”, To be submitted to IT, Nov 2010. J2. "Analyzing Finite-Rate Feedback of the General Covariance Matrix: Rate-Distortion and Capacity Loss Aspects ", To be submitted to IT, Nov 2010. J1. " Interference Alignment Under Limited Feedback for MIMO Interference Channels”, Submitted to IT, Nov 2009.

First graduate student to be appointed as an Instructor for a graduate level course (ECEN 5002 / ECEN 4652) by Electrical Engineering department at University of Colorado-Boulder.

Jan 2006 - Dec 2008

Master of Science

University of Colorado - Boulder

Secured a Grade Point Average of 4.0/4.0.

Course List: Noise and Random Processes, Information Theory, Theory and Applications of Digital Filtering, Advanced Linear Systems, Principles of Digital Communication, Error Control Coding, Detection and Extraction of Signals from Noise, Wireless Communication, Communication Networks, Functions of a Complex Variable - II, Functional Analysis - I, Functional Analysis - II, Random Matrices, Differential Geometry- I, Differential Geometry - II, Geometry of Quantum Fields and Strings.

Jul 1999 - May 2003

Bachelor of Technology

Indian Institute of Technology

Completed a Minor in Theoretical Computer Science.Even as an undergraduate student, I was appointed Teaching Assistant for 2 courses in Fall 2002 and Spring 2003 by Prof K Giridhar of IIT Madras.

Pseudo-Wire Implementation Edge-to-Edge [Final-year Project]I described a novel scheme for tunneling TDM data through a packet-based architectural framework. It was implemented using the concept of Circuit Emulation using pseudo-wires. Encapsulation schemes for TDM over IP packets (esp. AAL1) and clock recovery techniques were enlisted. RTP and RTCP stacks were employed to ensure in-order delivery of the PDUs. Fairness issues were also dealt with. [C implementation on Unix platform.]