Chandan Kumar Sheemar
YOU?
Author Swipe
View article: Multilayer Non-Terrestrial Networks with Spectrum Access aided by Beyond-Diagonal RIS
Multilayer Non-Terrestrial Networks with Spectrum Access aided by Beyond-Diagonal RIS Open
In this work, we study a multi-user NTN in which a satellite serves as the primary network and a high-altitude platform station (HAPS) operates as the secondary network, acting as a cognitive radio. To reduce the cost, complexity, and powe…
View article: Swarm Intelligence Optimization of Multi-RIS Aided MmWave Beamspace MIMO
Swarm Intelligence Optimization of Multi-RIS Aided MmWave Beamspace MIMO Open
We investigate the performance of a multiple reconfigurable intelligence surface (RIS)-aided millimeter wave (mmWave) beamspace multiple-input multiple-output (MIMO) system with multiple users (UEs). We focus on a challenging scenario in w…
View article: Enhancing Physical Layer Security in Cognitive Radio-Enabled NTNs with Beyond Diagonal RIS
Enhancing Physical Layer Security in Cognitive Radio-Enabled NTNs with Beyond Diagonal RIS Open
Beyond diagonal reconfigurable intelligent surfaces (BD-RIS) have emerged as a transformative technology for enhancing wireless communication by intelligently manipulating the propagation environment. This paper explores the potential of B…
View article: Beyond Diagonal RIS Enhanced Cognitive Radio Enabled Multilayer Non-Terrestrial Networks
Beyond Diagonal RIS Enhanced Cognitive Radio Enabled Multilayer Non-Terrestrial Networks Open
Beyond diagonal reconfigurable intelligent surfaces (BD-RIS) have emerged as a transformative technology for enhancing wireless communication by intelligently manipulating the propagation environment. Its interconnected elements offer enha…
View article: Survey on Beyond Diagonal RIS Enabled 6G Wireless Networks: Fundamentals, Recent Advances, and Challenges
Survey on Beyond Diagonal RIS Enabled 6G Wireless Networks: Fundamentals, Recent Advances, and Challenges Open
Beyond Diagonal Reconfigurable Intelligent Surfaces (BD-RIS) represent a groundbreaking innovation in sixth-generation (6G) wireless networks, enabling unprecedented control over wireless propagation environments compared to conventional d…
View article: Secrecy Rate Maximization for 6G Reconfigurable Holographic Surfaces Assisted Systems
Secrecy Rate Maximization for 6G Reconfigurable Holographic Surfaces Assisted Systems Open
Reconfigurable holographic surfaces (RHS) have emerged as a transformative material technology, enabling dynamic control of electromagnetic waves to generate versatile holographic beam patterns. This paper addresses the problem of secrecy …
View article: Joint Beamforming and 3D Location Optimization for Multi-User Holographic UAV Communications
Joint Beamforming and 3D Location Optimization for Multi-User Holographic UAV Communications Open
This paper pioneers the field of multi-user holographic unmanned aerial vehicle (UAV) communications, laying a solid foundation for future innovations in next-generation aerial wireless networks. The study focuses on the challenging proble…
View article: Joint Holographic Beamforming and User Scheduling with Individual QoS Constraints
Joint Holographic Beamforming and User Scheduling with Individual QoS Constraints Open
Reconfigurable holographic surfaces (RHS) have emerged as a transformative material technology, enabling dynamic control of electromagnetic waves to generate versatile holographic beam patterns. This paper addresses the problem of joint hy…
View article: Beyond Diagonal RIS: A New Frontier for 6G Internet of Things Networks
Beyond Diagonal RIS: A New Frontier for 6G Internet of Things Networks Open
Reconfigurable intelligent surface (RIS) technology has emerged as a promising enabler for next-generation wireless networks, offering a paradigm shift from passive environments to programmable radio wave propagation. Despite the potential…
View article: Joint Communications and Sensing for 6G Satellite Networks: Use Cases and Challenges
Joint Communications and Sensing for 6G Satellite Networks: Use Cases and Challenges Open
Satellite networks (SN) have long provided two fundamental services: global communications and Earth-oriented sensing, supporting applications from connectivity and navigation to disaster management and environmental monitoring. Yet, the a…
View article: Holographic MIMO for Next Generation Non-Terrestrial Networks: Motivation, Opportunities, and Challenges
Holographic MIMO for Next Generation Non-Terrestrial Networks: Motivation, Opportunities, and Challenges Open
In this article, we propose the integration of the Holographic Multiple Input Multiple Output (HMIMO) as a transformative solution for next generation Non-Terrestrial Networks (NTNs), addressing key challenges, such as high hardware costs,…
View article: Parallel and Distributed Hybrid Beamforming for Multicell Millimeter Wave MIMO Full Duplex
Parallel and Distributed Hybrid Beamforming for Multicell Millimeter Wave MIMO Full Duplex Open
peer reviewed
View article: Beyond Diagonal IRS Assisted Ultra Massive THz Systems: A Low Resolution Approach
Beyond Diagonal IRS Assisted Ultra Massive THz Systems: A Low Resolution Approach Open
The terahertz communications have the potential to revolutionize data transfer with unmatched speed and facilitate the development of new high-bandwidth applications. This paper studies the performance of downlink terahertz system assisted…
View article: Demonstration of Safe Electromagnetic Radiation Emitted by 5G Active Antenna Systems
Demonstration of Safe Electromagnetic Radiation Emitted by 5G Active Antenna Systems Open
The careful planning and safe deployment of 5G technologies will bring enormous benefits to society and the economy. Higher frequency, beamforming, and small-cells are key technologies that will provide unmatched throughput and seamless co…
View article: Location dependent allocation of timers and buffers at layer-2 in LEO based 5G-NTN
Location dependent allocation of timers and buffers at layer-2 in LEO based 5G-NTN Open
peer reviewed
View article: Experimental Study of the Effects of RLC Modes for 5G-NTN Applications Using OpenAirInterface5G
Experimental Study of the Effects of RLC Modes for 5G-NTN Applications Using OpenAirInterface5G Open
Provisioning of 5G services via Non-Terrestrial Networks (5G-NTN) has become a reality. Currently, 5G-NTN is being developed by adapting the 5G Terrestrial Network (5G-TN) protocol which presents several challenges as the satellite channel…
View article: Deep Reinforcement Learning for Backscatter Communications: Augmenting Intelligence in Future Internet of Things
Deep Reinforcement Learning for Backscatter Communications: Augmenting Intelligence in Future Internet of Things Open
Backscatter communication (BC) technology offers sustainable solutions for next-generation Internet-of-Things (IoT) networks, where devices can transmit data by reflecting and adjusting incident radio frequency signals. In parallel to BC, …
View article: Signal Processing Based Antenna Pattern Characterization for MIMO Systems
Signal Processing Based Antenna Pattern Characterization for MIMO Systems Open
peer reviewed
View article: Reconfigurable Intelligent Surfaces for 6G Non-Terrestrial Networks: Assisting Connectivity from the Sky
Reconfigurable Intelligent Surfaces for 6G Non-Terrestrial Networks: Assisting Connectivity from the Sky Open
This paper studies the potential of RIS-integrated NTNs to revolutionize the next-generation connectivity. First, it discusses the fundamentals of RIS technology. Secondly, it delves into reporting the recent advances in RIS-enabled NTNs. …
View article: Signal Processing Based Antenna Pattern Characterization for MIMO Systems
Signal Processing Based Antenna Pattern Characterization for MIMO Systems Open
Sophisticated antenna technologies are constantly evolving to meet the escalating data demands projected for 6G and future networks. The characterization of these emerging antenna systems poses challenges that necessitate a reevaluation of…
View article: Adaptive Timers and Buffer Optimization for Layer-2 Protocols in 5G Non-Terrestrial Networks
Adaptive Timers and Buffer Optimization for Layer-2 Protocols in 5G Non-Terrestrial Networks Open
Interest in the integration of Terrestrial Networks (TN) and Non-Terrestrial Networks (NTN); primarily satellites; has been rekindled due to the potential of NTN to provide ubiquitous coverage. Especially with the peculiar and flexible phy…
View article: IRS Assisted MIMO Full Duplex: Rate Analysis and Beamforming Under Imperfect CSI
IRS Assisted MIMO Full Duplex: Rate Analysis and Beamforming Under Imperfect CSI Open
Intelligent reflecting surfaces (IRS) have emerged as a promising technology to enhance the performance of wireless communication systems. By actively manipulating the wireless propagation environment, IRS enables efficient signal transmis…
View article: Robust Beamforming for IRS Aided MIMO Full Duplex Systems
Robust Beamforming for IRS Aided MIMO Full Duplex Systems Open
In this paper, a novel robust beamforming for an intelligent reflecting surface (IRS) assisted FD system is presented. Since perfect channel state information (CSI) is often challenging to acquire in practice, we consider the case of imper…
View article: Full Duplex Joint Communications and Sensing for 6G: Opportunities and Challenges
Full Duplex Joint Communications and Sensing for 6G: Opportunities and Challenges Open
The paradigm of joint communications and sensing (JCAS) envisions a revolutionary integration of communication and radar functionalities within a unified hardware platform. This novel concept not only opens up unprecedented interoperabilit…
View article: Full-Duplex-Enabled Joint Communications and Sensing with Reconfigurable Intelligent Surfaces
Full-Duplex-Enabled Joint Communications and Sensing with Reconfigurable Intelligent Surfaces Open
The full-duplex (FD) technology has the potential to radically evolve wireless systems, facilitating the integration of both communications and radar functionalities into a single device, thus, enabling joint communication and sensing (JCA…
View article: Parallel and Distributed Hybrid Beamforming for Multicell Millimeter Wave MIMO Full Duplex
Parallel and Distributed Hybrid Beamforming for Multicell Millimeter Wave MIMO Full Duplex Open
Full duplex (FD) is an auspicious wireless technology that holds the potential to double data rates through simultaneous transmission and reception. This paper proposes two innovative designs of hybrid beamforming (HYBF) for a multicell ma…
View article: IRS Assisted MIMO Full Duplex: Rate Analysis and Beamforming Under Imperfect CSI
IRS Assisted MIMO Full Duplex: Rate Analysis and Beamforming Under Imperfect CSI Open
peer reviewed