Search Results for author: R. S. Prasobh Sankar

Found 10 papers, 0 papers with code

Coded Aperture Radar Imaging Using Reconfigurable Intelligent Surfaces

no code implementations11 Aug 2023 R. S. Prasobh Sankar, Sundeep Prabhakar Chepuri

In this paper, we focus on radar imaging using active sensing with a single transceiver and reconfigurable intelligent surface (RIS).

Compressive Sensing

Learning to Precode for Integrated Sensing and Communications Systems

no code implementations11 Mar 2023 R. S. Prasobh Sankar, Sidharth S. Nair, Siddhant Doshi, Sundeep Prabhakar Chepuri

In this paper, we present an unsupervised learning neural model to design transmit precoders for integrated sensing and communication (ISAC) systems to maximize the worst-case target illumination power while ensuring a minimum signal-to-interference-plus-noise ratio (SINR) for all the users.

Optimal Placement of Active and Passive Elements in Hybrid RIS-assisted Communication Systems

no code implementations17 Jan 2023 R. S. Prasobh Sankar, Sundeep Prabhakar Chepuri

Hybrid reconfigurable intelligent surfaces (HRIS) are RIS architectures having both active and passive elements.

Quantized Precoding and RIS-Assisted Modulation for Integrated Sensing and Communications Systems

no code implementations3 Nov 2022 R. S. Prasobh Sankar, Sundeep Prabhakar Chepuri

In this paper, we present a novel reconfigurable intelligent surface (RIS)-assisted integrated sensing and communication (ISAC) system with 1-bit quantization at the ISAC base station.

Quantization

Beamforming in Integrated Sensing and Communication Systems with Reconfigurable Intelligent Surfaces

no code implementations15 Jun 2022 R. S. Prasobh Sankar, Sundeep Prabhakar Chepuri, Yonina C. Eldar

On the other hand, the dual-RIS assisted ISAC system improves both minimum user SINR as well as worst-case target illumination power at the targets, especially when the users and targets are not directly visible.

Beamforming in Hybrid RIS assisted Integrated Sensing and Communication Systems

no code implementations11 Mar 2022 R. S. Prasobh Sankar, Sundeep Prabhakar Chepuri

In this paper, we consider a hybrid reconfigurable intelligent surface (RIS) comprising of active and passive elements to aid an integrated sensing and communication (ISAC) system serving multiple users and targets.

Channel Estimation in MIMO Systems with One-bit Spatial Sigma-delta ADCs

no code implementations19 Sep 2021 R. S. Prasobh Sankar, Sundeep Prabhakar Chepuri

Using the developed noise model, we then present a two-step channel estimation algorithm to estimate a multipath channel parameterized by the gains, angles of arrival (AoAs), and angles of departure (AoDs).

Quantization

Joint Communication and Radar Sensing with Reconfigurable Intelligent Surfaces

no code implementations5 May 2021 R. S. Prasobh Sankar, Battu Deepak, Sundeep Prabhakar Chepuri

In this paper, we use a reconfigurable intelligent surface (RIS) to enhance the radar sensing and communication capabilities of a mmWave dual function radar communication system.

Channel Estimation for RIS-assisted Millimeter-wave MIMO Systems

no code implementations2 Nov 2020 Battu Deepak, R. S. Prasobh Sankar, Sundeep Prabhakar Chepuri

Channel estimation in reconfigurable intelligent surface (RIS) assisted multiple input multiple output (MIMO) communication systems is challenging as pilots cannot be decoded at or transmitted from a RIS with only passive elements.

Millimeter Wave MIMO Channel Estimation with 1-bit Spatial Sigma-delta Analog-to-Digital Converters

no code implementations23 Oct 2020 R. S. Prasobh Sankar, Sundeep Prabhakar Chepuri

This paper focuses on channel estimation for mmWave MIMO systems with 1-bit spatial sigma-delta analog-to-digital converters (ADCs).

Quantization

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