Search Results for author: Sheetal Kalyani

Found 37 papers, 2 papers with code

Unrolling SVT to obtain computationally efficient SVT for n-qubit quantum state tomography

no code implementations17 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.

Compressive Sensing Quantum State Tomography +1

Introducing the Huber mechanism for differentially private low-rank matrix completion

no code implementations16 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.

Low-Rank Matrix Completion Privacy Preserving

Rotate the ReLU to implicitly sparsify deep networks

no code implementations1 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.

The robust way to stack and bag: the local Lipschitz way

no code implementations1 Jun 2022 Thulasi Tholeti, Sheetal Kalyani

Recent research has established that the local Lipschitz constant of a neural network directly influences its adversarial robustness.

Adversarial Robustness

How to boost autoencoders?

no code implementations28 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.

Anomaly Detection Clustering

Binarized ResNet: Enabling Robust Automatic Modulation Classification at the resource-constrained Edge

no code implementations27 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.

Adversarial Robustness Binarization

BayesAoA: A Bayesian method for Computation Efficient Angle of Arrival Estimation

no code implementations15 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.

Cooperative 3D Beamforming for Small-Cell and Cell-Free 6G Systems

no code implementations16 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.

Deep learned SVT: Unrolling singular value thresholding to obtain better MSE

no code implementations14 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.

Low-Rank Matrix Completion Rolling Shutter Correction

Outage Probability Analysis of Uplink Cell-Free Massive MIMO Network with and without Pilot Contamination

no code implementations19 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

On the Differentially Private Nature of Perturbed Gradient Descent

no code implementations18 Jan 2021 Thulasi Tholeti, Sheetal Kalyani

We consider the problem of empirical risk minimization given a database, using the gradient descent algorithm.

On the Asymptotic Performance Analysis of the k-th Best Link Selection over Non-identical Non-central Chi-square Fading Channels

no code implementations18 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

Airplane-Aided Integrated Next-Generation Networking

no code implementations3 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.

Understanding Learning Dynamics of Binary Neural Networks via Information Bottleneck

no code implementations13 Jun 2020 Vishnu Raj, Nancy Nayak, Sheetal Kalyani

Compact neural networks are essential for affordable and power efficient deep learning solutions.

Intelligent Reflecting Surface Assisted Beam Index-Modulation for Millimeter Wave Communication

no code implementations26 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.

Tune smarter not harder: A principled approach to tuning learning rates for shallow nets

no code implementations22 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.

Green DetNet: Computation and Memory efficient DetNet using Smart Compression and Training

no code implementations20 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.

Deep Reinforcement Learning based Blind mmWave MIMO Beam Alignment

no code implementations25 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.

Policy Gradient Methods reinforcement-learning +1

Generalized Residual Ratio Thresholding

1 code implementation18 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.

Beyond 5G: Leveraging Cell Free TDD Massive MIMO using Cascaded Deep learning

no code implementations13 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.

Subspace clustering without knowing the number of clusters: A parameter free approach

no code implementations10 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.

Clustering

Concavifiability and convergence: necessary and sufficient conditions for gradient descent analysis

no code implementations28 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.

Design of Communication Systems using Deep Learning: A Variational Inference Perspective

1 code implementation18 Apr 2019 Vishnu Raj, Sheetal Kalyani

However, in communication systems, the receiver has to work with noise corrupted versions of transmit symbols.

Variational Inference

High SNR Consistent Compressive Sensing Without Signal and Noise Statistics

no code implementations17 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.

Compressive Sensing regression +1

Noise Statistics Oblivious GARD For Robust Regression With Sparse Outliers

no code implementations19 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.

regression

Structured and Unstructured Outlier Identification for Robust PCA: A Non iterative, Parameter free Algorithm

no code implementations11 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.

Signal and Noise Statistics Oblivious Orthogonal Matching Pursuit

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.

regression

A Centralized Multi-stage Non-parametric Learning Algorithm for Opportunistic Spectrum Access

no code implementations30 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.

Fast, Parameter free Outlier Identification for Robust PCA

no code implementations13 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.

An aggregating strategy for shifting experts in discrete sequence prediction

no code implementations5 Aug 2017 Vishnu Raj, Sheetal Kalyani

We study how we can adapt a predictor to a non-stationary environment with advises from multiple experts.

Spectrum Access In Cognitive Radio Using A Two Stage Reinforcement Learning Approach

no code implementations31 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.

reinforcement-learning Reinforcement Learning (RL)

Taming Non-stationary Bandits: A Bayesian Approach

no code implementations31 Jul 2017 Vishnu Raj, Sheetal Kalyani

We consider the multi armed bandit problem in non-stationary environments.

Thompson Sampling

Signal and Noise Statistics Oblivious Sparse Reconstruction using OMP/OLS

no code implementations27 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.

Tuning Free Orthogonal Matching Pursuit

no code implementations15 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.

Compressive Sensing regression

High SNR Consistent Compressive Sensing

no code implementations10 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.

Compressive Sensing Model Selection +2

Rate Prediction and Selection in LTE systems using Modified Source Encoding Techniques

no code implementations6 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.

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