Search Results for author: Geethu Joseph

Found 16 papers, 2 papers with code

Convergence of Expectation-Maximization Algorithm with Mixed-Integer Optimization

no code implementations31 Jan 2024 Geethu Joseph

The convergence of expectation-maximization (EM)-based algorithms typically requires continuity of the likelihood function with respect to all the unknown parameters (optimization variables).

Joint State and Input Estimation for Linear Dynamical Systems with Sparse Control

no code implementations4 Dec 2023 Rupam Kalyan Chakraborty, Geethu Joseph, Chandra R. Murthy

We present a Bayesian approach that exploits the input sparsity to significantly improve estimation accuracy.

Anomaly Detection via Learning-Based Sequential Controlled Sensing

no code implementations30 Nov 2023 Geethu Joseph, Chen Zhong, M. Cenk Gursoy, Senem Velipasalar, Pramod K. Varshney

Our objective is to design a sequential selection policy that dynamically determines which processes to observe at each time with the goal to minimize the delay in making the decision and the total sensing cost.

Anomaly Detection Decision Making +1

Minimal Input Structural Modifications for Strongly Structural Controllability

no code implementations8 Nov 2023 Geethu Joseph, Shana Moothedath, Jiabin Lin

This paper studies the problem of modifying the input matrix of a structured system to make the system strongly structurally controllable.

Sparse Millimeter Wave Channel Estimation From Partially Coherent Measurements

no code implementations11 Oct 2023 Weijia Yi, Nitin Jonathan Myers, Geethu Joseph

Our method exploits the sparse structure in mmWave channels for low training overhead and accounts for the phase errors in the channel measurements due to phase noise at the oscillator.

Kronecker-structured Sparse Vector Recovery with Application to IRS-MIMO Channel Estimation

1 code implementation11 Oct 2023 Yanbin He, Geethu Joseph

The prior art only exploits the Kronecker structure in the support of the sparse vector and solves the entire linear system together leading to high computational complexity.

Attribute Denoising

Bayesian Algorithms for Kronecker-structured Sparse Vector Recovery With Application to IRS-MIMO Channel Estimation

1 code implementation27 Jul 2023 Yanbin He, Geethu Joseph

We study the sparse recovery problem with an underdetermined linear system characterized by a Kronecker-structured dictionary and a Kronecker-supported sparse vector.

Structure-aware Sparse Bayesian Learning-based Channel Estimation for Intelligent Reflecting Surface-aided MIMO

no code implementations20 Oct 2022 Yanbin He, Geethu Joseph

This paper presents novel cascaded channel estimation techniques for an intelligent reflecting surface-aided multiple-input multiple-output system.

Near-field focusing using phased arrays with dynamic polarization control

no code implementations20 May 2022 Nitin Jonathan Myers, Yanki Aslan, Geethu Joseph

Phased arrays in near-field communication allow the transmitter to focus wireless signals in a small region around the receiver.

Temporal Detection of Anomalies via Actor-Critic Based Controlled Sensing

no code implementations3 Jan 2022 Geethu Joseph, M. Cenk Gursoy, Pramod K. Varshney

Based on the received observations, the decisionmaker first determines whether to declare that the number of anomalies has exceeded the threshold or to continue taking observations.

Anomaly Detection Decision Making

Scalable and Decentralized Algorithms for Anomaly Detection via Learning-Based Controlled Sensing

no code implementations8 Dec 2021 Geethu Joseph, Chen Zhong, M. Cenk Gursoy, Senem Velipasalar, Pramod K. Varshney

In this setting, we develop an anomaly detection algorithm that chooses the processes to be observed at a given time instant, decides when to stop taking observations, and declares the decision on anomalous processes.

Anomaly Detection Decision Making

LEARNING DISTRIBUTIONS GENERATED BY SINGLE-LAYER RELU NETWORKS IN THE PRESENCE OF ARBITRARY OUTLIERS

no code implementations29 Sep 2021 Saikiran Bulusu, Geethu Joseph, M. Cenk Gursoy, Pramod Varshney

Further, we prove that ${O}(\frac{1}{\epsilon p^4}\log\frac{d}{\delta})$ samples are sufficient for our algorithm to estimate the NN parameters within an error of $\epsilon$ with probability $1-\delta$ when the probability of a sample being uncorrupted is $p$ and the problem dimension is $d$.

Anomaly Detection via Controlled Sensing and Deep Active Inference

no code implementations12 May 2021 Geethu Joseph, Chen Zhong, M. Cenk Gursoy, Senem Velipasalar, Pramod K. Varshney

In this paper, we address the anomaly detection problem where the objective is to find the anomalous processes among a given set of processes.

Anomaly Detection Decision Making

A Scalable Algorithm for Anomaly Detection via Learning-Based Controlled Sensing

no code implementations12 May 2021 Geethu Joseph, M. Cenk Gursoy, Pramod K. Varshney

In this setting, we develop an anomaly detection algorithm that chooses the process to be observed at a given time instant, decides when to stop taking observations, and makes a decision regarding the anomalous processes.

Anomaly Detection Decision Making

Anomaly Detection Under Controlled Sensing Using Actor-Critic Reinforcement Learning

no code implementations26 May 2020 Geethu Joseph, M. Cenk Gursoy, Pramod K. Varshney

Our objective is to design a sequential sensor selection policy that dynamically determines which processes to observe at each time and when to terminate the detection algorithm.

Anomaly Detection Decision Making +3

Output Controllability of a Linear Dynamical System with Sparse Controls

no code implementations24 May 2020 Geethu Joseph

In this paper, we study the conditions to be satisfied by a discrete-time linear system to ensure output controllability using sparse control inputs.

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