# Pavan Koteshwar Srinath

Background - Research - Publications

**Position:** Research Associate

**E-mail:** pk423 [at] cam.ac.uk

**Office Location:** BN3-06

## Background

I was a research associate in the Signal Processing and Communications Laboratory, Department of Engineering, University of Cambridge, from November 2014 to June 2018. Prior to joining the department, I worked at Broadcom Communication Technologies, Bangalore, as a research scientist. I received the B. E. degree in Electronics and Communication Engineering from B. M. Sreenivasiah College of Engineering, Bangalore, India, the M. E. and Ph.D degrees in Electrical and Communication Engineering from the Indian Institute of Science, Bangalore, in 2005, 2008, and 2013, respectively. For My Ph.D thesis titled "Space Time Block Codes with Low Maximum-Likelihood decoding complexity and large coding gain", I received the Seshagiri-Kaikini medal for the best thesis in the department of Electrical and Communication Engineering at the Indian Institute of Science for the year 2012-2013. I was also awarded the INSPIRE Faculty Award (2016) by the Department of Science and Technology, Government of India, for carrying out independent research (declined offer).

## Research

My research interests are broadly in statistical inference, information theory, and communication theory. In the past, I have worked on space-time transmission schemes for multiple-input, multiple-output wireless systems. In particular, my past research was on obtaining coding schemes with low maximum-likelihood decoding complexity and/or high coding gain. My current interest is in obtaining computationally feasible methods with provable theoretical guarantees for high-dimensional statistical inference. In particular, I am interested in the following:

- Low-complexity algorithms for high-dimensional sparse linear inverse problems with applications to compressed sensing and machine learning.

- Non-parametric shrinkage estimation of high-dimensional (sparse) sequences.

## Publications

##### **Preprints**

- K. P. Srinath and R. Venkataramanan, " Empirical Bayes estimators for high-dimensional sparse vectors".

##### **Journal Articles**

- A. Ganesan and K. P. Srinath, " Interference Aligned Space-Time Transmission with Diversity for the 2x2 X-Network", accepted for publication in
*IEEE Transactions on Wireless Communications*. - K. P. Srinath and R. Venkataramanan, "Cluster-seeking James-Stein estimators,"
*IEEE Transactions on Information Theory*, vol. 64, no. 2, pp. 853-874, February 2018 [ PDF]

- K. P. Srinath and B. S. Rajan, "Fast-Decodable MIDO Codes with large Coding Gain,''
*IEEE Transactions on Information Theory*, vol. 60, no. 2, pp. 992-1007, February 2014. - K. P. Srinath and B. S. Rajan, "Improved Perfect Space-Time Block Codes,''
*IEEE Transactions on Information Theory*, vol. 59, no. 12, pp. 7927-7935, December 2013. - L. P. Natarajan, K. P. Srinath, and B. S. Rajan, "On the Sphere Decoding Complexity of High Rate Multigroup Decodable STBCs in Asymmetric MIMO Systems,''
*IEEE Transactions on Information Theory*, vol. 59, no. 9, pp. 5959-5965, September 2013. - K. P. Srinath and B. S. Rajan, "An Enhanced DMT-optimality Criterion for STBC-schemes for Asymmetric MIMO Systems,''
*IEEE Transactions on Information Theory*, vol. 59, no. 9, pp. 5944-5958, September 2013. - S. Karmakar, K. P. Srinath, and B. S. Rajan, "Maximum Rate of Unitary-Weight, Single-Symbol Decodable STBCs,''
*IEEE Transactions on Information Theory*, vol. 57, no. 12, pp. 7972-7981, December 2011. - K. P. Srinath and B. S. Rajan, "A Low ML-decoding Complexity, Full-diversity, Full-rate MIMO Precoder,''
*IEEE Transactions on Signal Processing*, vol. 59, no. 11, pp. 5485-5498, November 2011. - K. P. Srinath and B. S. Rajan, "Generalized Silver Codes,''
*IEEE Transactions on Information Theory*, vol. 57, no. 9, pp. 6134-6147, September 2011. - K. P. Srinath and B. S. Rajan, ``Low ML-Decoding Complexity, Large Coding Gain, Full-Rate, Full-Diversity STBCs for 2x2 and 4x2 MIMO Systems,''
*IEEE Journal of Selected Topics in Signal Processing*, vol. 3, no. 6, pp. 916-927, December 2009.

##### **Conference Proceedings**

- K. P. Srinath and R. Venkataramanan, "Empirical Bayes Estimators for Sparse Sequences", to be presented at the
*IEEE International Symposium on Information Theory (ISIT), Colorado*, June 17-22, 2018 . - K. P. Srinath and R. Venkataramanan, "Cluster-seeking Shrinkage Estimators", in the Proceedings of
*IEEE International Symposium on Information Theory (ISIT),*Barcelona, July 10-15, 2016. - A. Ganesan and K. P. Srinath, "Interference Aligned Space-Time Transmission with Diversity for the 2x2 X-Network," in the Proceedings of
*IEEE International Symposium on Information Theory (ISIT)*, Hong Kong, June 12-19, 2015. - K. P. Srinath and B. S. Rajan, "Fast-Decodable MIDO Codes with Large Coding Gain,'' in the Proceedings of
*IEEE International Symposium on Information Theory (ISIT)*, Istanbul, Turkey, July. 07-12, 2013, pp. 2910-2914. - K. P. Srinath and B. S. Rajan, "Improved Perfect Space-Time Block Codes,'' in the Proceedings of
*IEEE International Conference on Communications (ICC)*, Budapest, Hungary, June 09-13, 2013, pp. 3192-3197. - L. P. Natarajan, K. P. Srinath, and B. S. Rajan, "On the Sphere Decoding Complexity of High Rate Multigroup ML Decodable STBCs,'' in the Proceedings of
*IEEE International Symposium on Information Theory (ISIT)*, Cambridge, USA, July 01-06, 2012, pp. 2821-2825. - K. P. Srinath and B. S. Rajan, "DMT-optimal, Low ML-Complexity STBC-Schemes for Asymmetric MIMO Systems,'' in the Proceedings of
*IEEE International Symposium on Information Theory (ISIT)*, Cambridge, USA, July 01-06, 2012, pp. 3053-3057. - L. P. Natarajan, K. P. Srinath, and B. S. Rajan, "Generalized Distributive Law for ML-Decoding of STBCs,'' in the Proceedings of
*IEEE Information Theory Workshop (ITW)*, Paraty, Brazil, October 16-20, 2011, pp. 10-14. - K. P. Srinath and B. S. Rajan, "A Low ML-decoding Complexity, Full-diversity, Full-rate MIMO Precoder,'' in the Proceedings of
*IEEE International Symposium on Information Theory (ISIT)*, St. Petersburg, Russia, July 30-August 05, 2011, pp. 3013-3017. - K. P. Srinath and B. S. Rajan, "Reduced ML-Decoding Complexity, Full-Rate STBCs for 2^a Transmit Antenna Systems,'' in the Proceedings of
*IEEE Global Conference on Communications (GLOBECOM)*, Miami, Florida, USA, December 06-10, 2010, pp. 1-5. - K. P. Srinath and B. S. Rajan, "Reduced ML-Decoding Complexity, Full-Rate STBCs for 4 Transmit Antenna Systems,'' in the Proceedings of
*IEEE International Symposium on Information Theory (ISIT)*, Austin, Texas, USA, June 13-18, 2010, pp. 2228-2232. - K. P. Srinath and B. S. Rajan, "Single Real-symbol decodable, High-rate, Distributed Space-Time Block Codes,'' in the Proceedings of
*IEEE Information Theory Workshop (ITW)*, Cairo, Egypt, January 06-08, 2010. - K. P. Srinath and B. S. Rajan, "High-Rate, 2-Group ML-Decodable STBCs for 2^m Transmit Antennas,'' in the Proceedings of
*IEEE International Symposium on Information Theory (ISIT)*, Seoul, South Korea, June 28-July 03, 2009, pp. 2008-2012. - K. P. Srinath and B. S. Rajan, "A Low ML-Decoding Complexity, High Coding-Gain, Full-Rate, Full-Diversity STBC for 4x2 MIMO System,'' in the Proceedings of
*IEEE International Conference on Communications (ICC)*, Dresden, Germany, June 14-18, 2009, pp. 1-5. - K. P. Srinath and B. S. Rajan, "A Low-Complexity, Full-Rate, Full-Diversity 2x2 STBC with Golden Code's Coding Gain,'' in the Proceedings of
*IEEE Global Conference on Communications (GLOBECOM)*, New Orleans, USA, November 30-December 04, 2008, pp. 1-5.

##### **Thesis**

Space Time Block Codes with Low Maximum-Likelihood decoding complexity and large coding gain. Ph.D Thesis, Indian Institute of Science, 2012 [ PDF]

##### **Patents**

- "Data Transmission in Wireless Communication System,'' US Patent No.: US 8,111,779 B2; Date of Patent: Feb. 07, 2012; Inventors: K. P. Srinath and B. Sundar Rajan.
- "Data Transmission in Wireless Communication System,'' US Patent No.: US 8,279,964 B2; Date of Patent: Oct. 02, 2012; Inventors: K. P. Srinath and B. Sundar Rajan.

## Teaching

Small group supervisions for the following Engineering Tripos Part IIA modules: 3F1 (Signals and systems), 3F3 (Signal and Pattern Processing), 3F4 (Data Transmission), 3F7 (Information Theory and Coding), 3F8 (Inference), Coding and Cryptography (Maths Tripos).