Research   Publications

Broad Research Areas

Statistical Signal Processing

Wireless Communication & Networks

Information Theory

Selected Publications

Statistical Signal Processing


S. C. Sreenivasan and S. Bhashyam, "Sequential Nonparametric Detection of Anomalous Data Streams," in IEEE Signal Processing Letters.

A. Jain, P. Sarvepalli, S. Bhashyam and A. Pachai Kannu, Algorithms for Change Detection with Sparse Signals," IEEE Transactions on Signal Processing, vol. 68, pp. 1331-1345, 2020.    

G. R. Prabhu, S. Bhashyam, A. Gopalan, R. Sundaresan, Learning to Detect an Anomalous Target with Observations from an Exponential Family, 2019 IEEE Data Science Workshop (DSW), Minneapolis, MN, USA, 2019, pp. 88-92.    

A. Deshmukh, S. Bhashyam, V. V. Veeravalli, Controlled Sensing for Composite Multihypothesis Testing with Application to Anomaly Detection, Proceedings of the 52nd Asilomar Conference on Signals, Systems and Computers, Pacific Grove, CA, USA, Oct 2018.    

V. Singamasetty, N. Nair, S. Bhashyam, A. P. Kannu, Change detection with unknown post-change parameter using Kiefer-Wolfowitz method, Proceedings of ICASSP 2017, New Orleans, USA, March 2017.


A. P. Sabulal, S. Bhashyam, "Joint Sparse Recovery using Deep Unfolding With Application to Massive Random Access," ICASSP 2020 - 2020 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), Barcelona, Spain, 2020, pp. 5050-5054.  

M. R. Raghavendra, S. Bhashyam, K. Giridhar, "Interference Rejection for Reuse-1 Cellular OFDM Systems using Parametric Channel Estimation," IEEE Transactions on Vehicular Technology, vol. 58, no. 8, pp. 4342-4352, October 2009.

M. R. Raghavendra, E. Lior, S. Bhashyam, K. Giridhar, "Parametric Channel Estimation for Pseudo-Random Tile-Allocation in Uplink OFDMA," IEEE Transactions on Signal Processing, vol. 55, no. 11, pp. 5370-5381, November 2007.

M. R. Raghavendra, S. Bhashyam, K. Giridhar, "Exploiting Hopping Pilots for Parametric Channel Estimation in OFDM Systems", IEEE Signal Processing Letters, vol. 12, no. 11, pp. 737-740, November 2005.


Wireless Communication & Networks

V. N. Moothedath and S. Bhashyam, "Distributed Pareto Optimal Beamforming for the MISO Multi-band Multi-cell Downlink," in IEEE Transactions on Wireless Communications, vol. 19, no. 11, pp. 7196-7209, Nov. 2020.

S. S. Nair and S. Bhashyam, "Hybrid beamforming in MU-MIMO using partial interfering beam feedback," in IEEE Communications Letters, vol. 24, no. 7, pp. 1548-1552, July 2020.

R. Chaluvadi, S. S. Nair, S. Bhashyam, "Optimal Multi-antenna Transmission with Multiple Power Constraints," IEEE Transactions on Wireless Communications, vol. 18, no. 7, pp. 3382-3394, July 2019.

T. R. Ramya, S. Bhashyam, "Using delayed feedback for antenna selection in MIMO systems," IEEE Transactions on Wireless Communications, vol. 8, no. 12, pp. 6059-6067, December 2009.

K. V. Srinivas, R. D. Koilpillai, S. Bhashyam, K. Giridhar, "Co-ordinate Interleaved Spatial Multiplexing with Channel State Information," IEEE Transactions on Wireless Communications, vol.8, no.6, pp. 2755-2762, June 2009.

V. S. Annapureddy, D. V. Marathe, T. R. Ramya, S. Bhashyam, "Outage Probability of Multiple-Input Single-Output (MISO) Systems with Delayed Feedback," IEEE Transactions on Communications, vol. 57, no. 2, pp. 319-326, Feb 2009.

D. Thirumulanathan, H. Vinay, S. Bhashyam, R. Sundaresan, "Almost Budget Balanced Mechanisms with Scalar Bids For Allocation of a Divisible Good", European Journal of Operational Research, Volume 262, Issue 3, 1 November 2017, Pages 1196-1207, ISSN 0377-2217.

H. Ahmed, K. Jagannathan, S. Bhashyam, "Queue-Aware Optimal Resource Allocation for the LTE Downlink with Best M Sub-band Feedback," IEEE Transactions on Wireless Communications, vol. 14, no. 9, pp. 4923-4933, Sep. 2015.

C. Manikandan, S. Bhashyam, R. Sundaresan, "Cross-layer scheduling with infrequent channel and queue measurements," IEEE Transactions on Wireless Communications, vol. 8, no. 12, pp. 5737-5742, December 2009.

C. Mohanram, S. Bhashyam, "Joint Subcarrier and Power Allocation in Channel-Aware Queue-Aware Scheduling for Multiuser OFDM," IEEE Transactions on Wireless Communications, vol. 6, no. 9, pp. 3208-3213, September 2007.

A. K. Chorppath, S. Bhashyam, R. Sundaresan, "A convex optimization framework for almost budget balanced allocation of a divisible good," IEEE Transactions on Automation Science and Engineering, vol.8, no.3, pp.520-531, July 2011.

Information Theory

R. Chaluvadi, M. Bolli, S. Bhashyam, On the Optimality of Interference Decoding Schemes for K-User Gaussian Interference Channels. Entropy 2019, 21, 1053. Special Issue on Multiuser Information Theory II.

R. Prasad, S. Bhashyam, A. Chockalingam, "On the Gaussian Many-to-One X Channel," IEEE Transactions on Information Theory, vol. 62, no. 1, pp. 244-259, Jan 2016.        

R. Prasad, S. Bhashyam, A. Chockalingam, "On the Sum-Rate of the Gaussian MIMO Z Channel and the Gaussian MIMO X Channel," IEEE Transactions on Communications, vol. 63, no. 2, pp. 487-497, Feb. 2015.

Praneeth Kumar V., S. Bhashyam, "MIMO Gaussian X Channel: Noisy Interference Regime," IEEE Communications Letters, vol. 18, no. 8, pp. 1295-1298, Aug. 2014.

A. V. Mampilly, S. Bhashyam, On decode-and-forward relaying for the diamond relay channel with multicarrier transmission, Proceedings of ICC 2017, Paris, France, May 2017.

A. V. Mampilly, S. Bhashyam, On the Capacity of the Half-Duplex MIMO Gaussian Diamond Channel, Proceedings of the 2016 International Symposium on Information Theory and its Applications, Monterey, CA, USA, Oct-Nov 2016.

Bama Muthuramalingam, S. Bhashyam, A. Thangaraj, "A Decode and Forward Protocol for Two-stage Gaussian Relay Networks," IEEE Transactions on Communications, col. 60, no. 1, pp. 68-73, January 2012.

P. S. Elamvazhuthi, B. K. Dey, S. Bhashyam, An MMSE strategy at relays with partial CSI for a multi-layer relay network, IEEE Transactions on Signal Processing, Vol. 62, No. 2, pp. 271-282, Jan. 15, 2014.

Aparna V. Nampoothiri, S. Bhashyam, Co-ordinate Interleaved Amplify-and-forward Relaying with a Multi-antenna Relay, Proceedings of NCC 2015, IIT Bombay, Mumbai, Feb-Mar. 2015.

A. V. Mampilly and S. Bhashyam, "Successive Relaying for Two-hop Two-Destination Multicarrier Relay Channels," IEEE Communications Letters, vol. 24, no. 3, pp. 685-689, March 2020.

K. Ravindran, A. Thangaraj, S. Bhashyam, "High SNR Error Analysis for Bidirectional Relaying with Physical Layer Network Coding," IEEE Transactions on Communications, vol. 65, no. 4, pp. 1536-1548, Apr. 2017.

K. Ravindran, A. Thangaraj, S. Bhashyam, "LDPC Codes for Network-coded Bidirectional Relaying with Higher Order Modulation," IEEE Transactions on Communications, vol. 63, no. 6, pp. 1975-1987, Jun 2015.

V. N. Swamy, S. Bhashyam, R. Sundaresan, P. Viswanath, "An asymptotically optimal push-pull method for multicasting over a random network," IEEE Transactions on Information Theory, Vol. 59, No. 8, pp. 5075-5087, Aug. 2013.

Prathyusha V, S. Bhashyam, A. Thangaraj, The Gaussian Two-way Diamond Channel, Proceedings of Allerton conference on Communication, Control, and Computing, Monticello, IL, Oct. 2013.

Ishaque Ashar K, Prathyusha V, S. Bhashyam, A. Thangaraj, "Outer Bounds for the Capacity Region of a Gaussian Two-way Relay Channel," Proceedings of Allerton conference on Communication, Control, and Computing, Monticello, IL, Oct. 2012.

Overview (Wireless Communication & Information Theory)

With the number of wireless devices increasing, wireless networks are becoming more and more dense. Communication of information from a source to a destination in such a network can be considered to be an information flow. Multiple flows need to be supported simultaneously by the wireless network. Furthermore, the source and destination for each flow may be separated by multiple hops. Understanding the fundamental limits of multi-hop multi-flow wireless communication is key to understand such wireless networks.

What makes wireless networks different from wireline networks? Two main characteristics of wireless communication channels are (1) the time-varying nature, and (2) the broadcast (or shared) nature of the channel.

In the above context, two key thrust areas of our research group are: (1) dynamic resource allocation, and (2) information flow/relaying, cooperation, and interference management.