no code implementations • 17 Dec 2022 • Siva Shanmugam, Sheetal Kalyani
Existing works focus on estimating the density matrix that represents the state, using a compressive sensing approach, with only fewer measurements than that required for a tomographically complete set, with the assumption that the true state has a low rank.
no code implementations • 16 Jun 2022 • R Adithya Gowtham, Gokularam M, Thulasi Tholeti, Sheetal Kalyani
We also propose using the Iteratively Re-Weighted Least Squares algorithm to complete low-rank matrices and study the performance of different noise mechanisms in both synthetic and real datasets.
no code implementations • 1 Jun 2022 • Nancy Nayak, Sheetal Kalyani
We show that this activation wherein the rotation is learned via training results in the elimination of those parameters/filters in the network which are not important for the task.
no code implementations • 1 Jun 2022 • Thulasi Tholeti, Sheetal Kalyani
Recent research has established that the local Lipschitz constant of a neural network directly influences its adversarial robustness.
no code implementations • 28 Oct 2021 • Sai Krishna, Thulasi Tholeti, Sheetal Kalyani
Autoencoders are a category of neural networks with applications in numerous domains and hence, improvement of their performance is gaining substantial interest from the machine learning community.
no code implementations • 27 Oct 2021 • Deepsayan Sadhukhan, Nitin Priyadarshini Shankar, Nancy Nayak, Thulasi Tholeti, Sheetal Kalyani
The proposed MC method with RBLResNets has an adversarial accuracy of $87. 25\%$ over a wide range of SNRs, surpassing the robustness of all existing SOTA methods to the best of our knowledge.
no code implementations • 15 Oct 2021 • Akshay Sharma, Nancy Nayak, Sheetal Kalyani
The proposed method achieves $92\%$ accuracy in a channel of noise variance $10^{-6}$ with $19. 3\%$ of the brute-force method's computation.
no code implementations • 16 May 2021 • Sarath Gopi, Sheetal Kalyani, Lajos Hanzo
Three dimensional (3D) resource reuse is an important design requirement for the prospective 6G wireless communication systems.
no code implementations • 14 May 2021 • Siva Shanmugam, Sheetal Kalyani
Affine rank minimization problem is the generalized version of low rank matrix completion problem where linear combinations of the entries of a low rank matrix are observed and the matrix is estimated from these measurements.
no code implementations • 19 Jan 2021 • Shashank Shekhar, Muralikrishnan Srinivasan, Sheetal Kalyani
The signal-to-interference-plus-noise ratio (SINR) of the CF-mMIMO system is approximated via a Log-normal distribution using a two-step moment matching method.
Dimensionality Reduction Information Theory Information Theory
no code implementations • 18 Jan 2021 • Thulasi Tholeti, Sheetal Kalyani
We consider the problem of empirical risk minimization given a database, using the gradient descent algorithm.
no code implementations • 18 Jan 2021 • Athira Subhash, Sheetal Kalyani, Yazan H. Al-Badarneh, Mohamed-Slim Alouini
This paper derives the asymptotic distribution of the normalized $k$-th maximum order statistics of a sequence of non-central chi-square random variables with non-identical non-centrality parameter.
Information Theory Information Theory
no code implementations • 3 Jan 2021 • Muralikrishnan Srinivasan, Sarath Gopi, Sheetal Kalyani, Xiaojing Huang, Lajos Hanzo
A high-rate yet low-cost air-to-ground (A2G) communication backbone is conceived for integrating the space and terrestrial network by harnessing the opportunistic assistance of the passenger planes or high altitude platforms (HAPs) as mobile base stations (BSs) and millimetre wave communication.
no code implementations • 13 Jun 2020 • Vishnu Raj, Nancy Nayak, Sheetal Kalyani
Compact neural networks are essential for affordable and power efficient deep learning solutions.
no code implementations • 26 Mar 2020 • Sarath Gopi, Sheetal Kalyani, Lajos Hanzo
Millimeter wave communication is eminently suitable for high-rate wireless systems, which may be beneficially amalgamated with intelligent reflecting surfaces (IRS), relying on beam-index modulation.
no code implementations • 22 Mar 2020 • Thulasi Tholeti, Sheetal Kalyani
Effective hyper-parameter tuning is essential to guarantee the performance that neural networks have come to be known for.
no code implementations • 20 Mar 2020 • Nancy Nayak, Thulasi Tholeti, Muralikrishnan Srinivasan, Sheetal Kalyani
This paper introduces an incremental training framework for compressing popular Deep Neural Network (DNN) based unfolded multiple-input-multiple-output (MIMO) detection algorithms like DetNet.
no code implementations • 25 Jan 2020 • Vishnu Raj, Nancy Nayak, Sheetal Kalyani
Directional beamforming is a crucial component for realizing robust wireless communication systems using millimeter wave (mmWave) technology.
1 code implementation • 18 Dec 2019 • Sreejith Kallummil, Sheetal Kalyani
Simultaneous orthogonal matching pursuit (SOMP) and block OMP (BOMP) are two widely used techniques for sparse support recovery in multiple measurement vector (MMV) and block sparse (BS) models respectively.
no code implementations • 13 Oct 2019 • Navaneet Athreya, Vishnu Raj, Sheetal Kalyani
This paper deals with the calibration of Time Division Duplexing (TDD) reciprocity in an Orthogonal Frequency Division Multiplexing (OFDM) based Cell Free Massive MIMO system where the responses of the (Radio Frequency) RF chains render the end to end channel non-reciprocal, even though the physical wireless channel is reciprocal.
no code implementations • 10 Sep 2019 • Vishnu Menon, Gokularam M, Sheetal Kalyani
In this work, a parameter free method for subspace clustering is proposed, where the data points are clustered on the basis of the difference in statistical distribution of the angles subtended by the data points within a subspace and those by points belonging to different subspaces.
no code implementations • 28 May 2019 • Thulasi Tholeti, Sheetal Kalyani
We show that concavifiability is a necessary and sufficient condition to satisfy the upper quadratic approximation which is key in proving that the objective function decreases after every gradient descent update.
1 code implementation • 18 Apr 2019 • Vishnu Raj, Sheetal Kalyani
However, in communication systems, the receiver has to work with noise corrupted versions of transmit symbols.
no code implementations • 17 Nov 2018 • Sreejith Kallummil, Sheetal Kalyani
The HSC results available in literature for support recovery techniques applicable to underdetermined linear regression models like least absolute shrinkage and selection operator (LASSO), orthogonal matching pursuit (OMP) etc.
no code implementations • 19 Sep 2018 • Sreejith Kallummil, Sheetal Kalyani
Both inlier and outlier noise statistics are rarely known \textit{a priori} and this limits the efficient operation of many SRIRR algorithms.
no code implementations • 11 Sep 2018 • Vishnu Menon, Sheetal Kalyani
Most of the existing methods for this model assumes either the knowledge of the dimension of the lower dimensional subspace or the fraction of outliers in the system.
no code implementations • ICML 2018 • Sreejith Kallummil, Sheetal Kalyani
Orthogonal matching pursuit (OMP) is a widely used algorithm for recovering sparse high dimensional vectors in linear regression models.
no code implementations • 30 Apr 2018 • Thulasi Tholeti, Vishnu Raj, Sheetal Kalyani
Owing to the ever-increasing demand in wireless spectrum, Cognitive Radio (CR) was introduced as a technique to attain high spectral efficiency.
no code implementations • 13 Apr 2018 • Vishnu Menon, Sheetal Kalyani
Robust PCA, the problem of PCA in the presence of outliers has been extensively investigated in the last few years.
no code implementations • 5 Aug 2017 • Vishnu Raj, Sheetal Kalyani
We study how we can adapt a predictor to a non-stationary environment with advises from multiple experts.
no code implementations • 3 Aug 2017 • Saishankar Katri Pulliyakode, Sheetal Kalyani
Wireless systems perform rate adaptation to transmit at highest possible instantaneous rates.
no code implementations • 31 Jul 2017 • Vishnu Raj, Irene Dias, Thulasi Tholeti, Sheetal Kalyani
Here, we propose an algorithm to not only select a channel for data transmission but also to predict how long the channel will remain unoccupied so that the time spent on channel sensing can be minimized.
no code implementations • 31 Jul 2017 • Vishnu Raj, Sheetal Kalyani
We consider the multi armed bandit problem in non-stationary environments.
no code implementations • 27 Jul 2017 • Sreejith Kallummil, Sheetal Kalyani
Orthogonal matching pursuit (OMP) and orthogonal least squares (OLS) are widely used for sparse signal reconstruction in under-determined linear regression problems.
no code implementations • 15 Mar 2017 • Sreejith Kallummil, Sheetal Kalyani
We also produce a tuning free algorithm (TF-GARD) for efficient estimation in the presence of sparse outliers by extending the operating principle of TF-OMP to GARD.
no code implementations • 10 Mar 2017 • Sreejith Kallummil, Sheetal Kalyani
Further, the limited literature available on the high SNR consistency of subset selection procedures (SSPs) is applicable to linear regression with full rank measurement matrices only.
no code implementations • 6 Mar 2014 • K. P. Saishankar, Sheetal Kalyani, K. Narendran
Finding the optimal depth of the frequency tree used for prediction is cast as a model order selection problem.