Signal Processing and Communications Laboratory

Department of Engineering

Ramji Venkataramanan

Background - Research - Publications - Teaching - Group

Position: University Lecturer

Office Location: BE3-12

Telephone: 01223 766767 (If calling from outside the UK, replace the 0 with +44)

E-mail: ramji.v [at] eng.cam.ac.uk

(My last name is pronounced "Ven-cut-rum-uh-nun")

Background

I am a University Lecturer in Engineering at the University of Cambridge where I am also a Fellow of Trinity Hall. I am part of the Signal Processing and Communications Lab in the Division of Information Engineering. I received my PhD in Electrical Engineering(Systems) from the University of Michigan, Ann Arbor in 2008, and my undergraduate degree from the Indian Institute of Technology, Madras in 2002. Before joining Cambridge University in 2013, I held post-doctoral positions at Stanford University and Yale University.

Research Interests

My research focuses on communications and information processing for networks. Particular areas of interest include information theory, coding, compression, and statistical inference. For a detailed description of my work, click here. My publications are listed below.

You can find more information about the Communications research group here. The group usually meets on Wednesdays during Term for an informal seminar. It is open to all; feel free to drop in if there is a talk of interest.

Publications

Preprints

  • R. Venkataramanan and S. Tatikonda, "The Gaussian Rate-Distortion Function of Sparse Regression Codes with Optimal Encoding" [PDF]
  • R. Venkataramanan, V. N. Swamy and K. Ramchandran, "Low-Complexity Interactive Algorithms for Synchronization from Deletions, Insertions, and Substitutions" [PDF]

Journal Articles

  • R. Venkataramanan, T. Sarkar and S. Tatikonda, "Lossy Compression via Sparse Linear Regression: Computationally Efficient Encoding and Decoding", IEEE Transactions on Information Theory, vol. 60, no. 6, pp. 3265-3278, June 2014. [PDF]
  • R. Venkataramanan, A. Joseph and S. Tatikonda, "Lossy Compression via Sparse Linear Regression: Performance under Minimum-distance Encoding", IEEE Transactions on Information Theory, vol. 60, no. 6, pp. 3254-3264, June 2014. [PDF]
  • R. Venkataramanan, S. Tatikonda, L. Lastras-Montaņo and M. Franceschini, "Rewritable storage channels with hidden state", IEEE Journal on Selected Areas in Communication, vol.32, no.5, pp. 815-824, May 2014. [PDF]
  • R. Venkataramanan, S. Tatikonda and K. Ramchandran, "Achievable Rates for channels with deletions and insertions", IEEE Transactions on Information Theory, vol. 59, no.11, pp. 6990-7013, November 2013.[PDF]
  • R. Venkataramanan and S. S. Pradhan, "An Achievable Rate Region for the Broadcast Channel with Feedback", IEEE Transactions on Information Theory, vol. 59, no.10, pp. 6175-6191, October 2013. [PDF]
  • R. Venkataramanan and S. S. Pradhan, "A New Achievable Rate Region for the Discrete Memoryless Multiple-Access Channel with Feedback", IEEE Transactions on Information Theory, vol. 57, pp. 8038-8054, December 2011. [PDF]
  • R. Venkataramanan and S. S. Pradhan, "Achievable rates for multiple descriptions with feed-forward", IEEE Transactions on Information Theory, vol. 57, no.4, pp. 2270-2277, April 2011. [PDF]
  • R. Venkataramanan and S. S. Pradhan, "On computing the feedback capacity of channels and the feed-forward rate-distortion function of sources", IEEE Transactions on Communications, vol. 58, pp. 1889-1896, July 2010. [PDF]
  • R. Venkataramanan and S. S. Pradhan, "Source coding with feedforward: Rate-distortion theorems and error exponents for a general source", IEEE Transactions on Information Theory, vol. 53, pp. 2154-2179, June 2007. [PDF]
  • R. Venkataramanan and K. M. M. Prabhu, "Estimation of Frequency Offset using Warped DFT", Signal Processing, vol. 86, pp. 250-256, Feb. 2006. [PDF]

For a complete list of publications, including my thesis and various conference papers, click here

Copyright notice: Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the copyright holders.

Teaching

Michaelmas Term 2014: 4F5 Advanced Communications and Coding

Lent Term 2014: 1B Paper 6 Communications

I also do Part 1B Engineering supervisions for Trinity Hall: Paper 6 (Information Engineering) and Paper 7 (Mathematical Methods)

Seminars

I organise the Signal Processing and Communications Lab seminar, held roughly once in two weeks. If you'd like to give a talk at the seminar, please send me an email.

The Communications group usually meets on Wednesdays during Term for an informal seminar. It is open to all; feel free to drop in if there is a talk of interest.

Group

M.Eng students:

  • Hafiz Azman
  • Yujean Khapkin
  • Ellen Davies (graduated in 2014)

Ph.D positions: If you have a strong mathematical background (especially in probability) and are interested in doing a PhD in information theory and coding, feel free to contact me. I will do my best to reply, but due to the high volume of email I receive, I may not be able to respond quickly.

Information about applying for a Ph.D in the Department of Engineering can be found here. Funding for PhD students is available from various sources including the Cambridge Trusts for international students, CHESS for students from the EU, and EPSRC doctoral training awards for UK students. Applying early is highly recommended; here are the funding deadlines.

Note: I do not have any summer internship opportunities available.

Postdoctoral Positions: There are number of fellowships available for postdoctoral research at Cambridge.

Most of these fellowships require a research proposal submitted with the support of the host organisation (Cambridge University, in this case). If you are looking for a postdoctoral position and your research interests overlap with mine, feel free to contact me. In addition to these fellowships, I may have funds available for postdoctoral positions in the future. A number of the Cambridge colleges also sponsor Junior Research Fellowships to support recent Ph.D graduates. Additional details are usually available on the individual college websites. Here is one such scheme.