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Since security has been one of the crucial issues for high-yield communications such as 5G and 6G, the researchers continuously come up with newer techniques to enhance the security and performance of these progressive wireless…

Information Theory · Computer Science 2021-12-14 T. Hossain , S. Shabab , A. S. M. Badrudduza , M. K. Kundu , I. S. Ansari

This Letter presents a novel hybrid underwater wireless optical communication (UWOC) system that integrates underwater optical access points (UOAPs) with a passive optical network (PON)-based fiber-optic backhaul to provide a resilient…

Systems and Control · Electrical Eng. & Systems 2025-10-21 Aboozar Heydaribeni , Hamzeh Beyranvand

In the dynamic realm of 6G technology, emphasizing security is essential, particularly for optimizing high-performance communication. A notable strategy involves the use of reconfigurable intelligent surfaces (RISs), an emerging and…

Information Theory · Computer Science 2024-08-13 Md. Abdur Rakib , Md. Ibrahim , A. S. M. Badrudduza , Imran Shafique Ansari

In this paper, we investigate the performance of a mixed radio-frequency-underwater wireless optical communication (RF-UWOC) system where an unmanned aerial vehicle (UAV), as a low-altitude mobile aerial base station, transmits information…

Information Theory · Computer Science 2020-11-19 Sai Li , Liang Yang , Daniel Benevides da Costa

Reconfigurable intelligent surfaces (RISs), which can deliberately adjust the phase of incident waves, have shown enormous potentials to reconfigure the signal propagation for performance enhancement. In this paper, we investigate the…

Signal Processing · Electrical Eng. & Systems 2020-11-02 Zhengyi Zhou , Ning Ge , Wendong Liu , Zhaocheng Wang

This paper presents a dual-hop hybrid framework that integrates a free-space optical (FSO)/RIS-aided radio frequency (RF) link operating under a hard-switching protocol as the first hop, and an optical reconfigurable intelligent surface…

Systems and Control · Electrical Eng. & Systems 2026-04-08 Aboozar Heydaribeni , Hamzeh Beyranvand , Sahar Eslami

In this paper, we analyze the performance of a reconfigurable intelligent surface (RIS)-assisted multi-hop transmission by employing multiple RIS units to enable favorable communication for a mixed free-space optical (FSO) and…

Information Theory · Computer Science 2023-07-18 Vinay Kumar Chapala , S. M. Zafaruddin

In recent years, reconfigurable intelligent surfaces (RIS) have garnered significant attention for their ability to control the phase shifts in reflected signals. By intelligently adjusting these phases, RIS can establish seamless direct…

Networking and Internet Architecture · Computer Science 2024-12-17 Peini Yi , Wenchi Cheng , Jingqing Wang , Wei Zhang

As an emerging wireless communication technology, reconfigurable intelligent surface (RIS) has become a basic choice for providing signal coverage services in scenarios with dense obstacles or long tunnels through multi-hop configurations.…

Information Theory · Computer Science 2024-07-16 Rujing Xiong , Jialong Lu , Jianan Zhang , Minggang Liu , Xuehui Dong , Tiebin Mi , Robert Caiming Qiu

This paper introduces a relay-assisted solution for downlink communications in a mixed system of Radio Frequency (RF) and Underwater Optical Wireless Communications (UOWC) technologies. During the initial downlink phase, data transmission…

Systems and Control · Electrical Eng. & Systems 2024-07-04 Tijana Devaja , Milica Petkovic , Marko Beko , Dejan Vukobratovic

Optical reconfigurable intelligent surface (ORIS) is an emerging technology that can achieve reconfigurable optical propagation environments by precisely adjusting signal's reflection and shape through a large number of passive reflecting…

Signal Processing · Electrical Eng. & Systems 2022-01-24 Haibo Wang , Zaichen Zhang , Bingcheng Zhu , Yidi Zhang

In this paper, we analyze the performance of a reconfigurable intelligent surface (RIS)-assisted unmanned aerial vehicle (UAV) wireless system that is affected by mixture-gamma small-scale fading, stochastic disorientation, and…

Signal Processing · Electrical Eng. & Systems 2022-01-31 Alexandros-Apostolos A. Boulogeorgos , Angeliki Alexiou , Marco Di Renzo

This letter investigates the performance of emerging wireless communication systems assisted by a fluid reconfigurable intelligent surface (FRIS). Unlike conventional reconfigurable intelligent surfaces (RISs), an FRIS consists of…

This letter studies the performance of reconfigurable intelligent surface (RIS)-aided communications for a fluid antenna system (FAS) enabled receiver. Specifically, a fixed singleantenna base station (BS) transmits information through a…

Information Theory · Computer Science 2024-02-27 Farshad Rostami Ghadi , Kai-Kit Wong , Wee Kiat New , Hao Xu , Ross Murch , Yangyang Zhang

Underwater acoustic (UWA) communications are essential for high-speed marine data transmission but remain severely constrained by limited bandwidth, significant propagation loss, and sparse multipath structures. Conventional underwater…

Networking and Internet Architecture · Computer Science 2025-12-19 Longfei Zhao , Jingbo Tan , Jintao Wang , Ian F Akyildiz , Zhi Sun

In this paper, Recofigurable Intelligent Surface (RIS) assisted dual-hop multicast wireless communication network is proposed with two source nodes and two destination nodes. RIS boosts received signal strength through an intelligent…

Signal Processing · Electrical Eng. & Systems 2020-06-30 Vetrivel Chelian Thirumavalavan , PGS Velmurugan , Thiruvengadam S J

In this work, we present a unified framework for the performance analysis of dual-hop underwater wireless optical communication (UWOC) systems with amplify-and-forward fixed gain relays in the presence of air bubbles and temperature…

Information Theory · Computer Science 2020-07-08 Emna Zedini , Abla Kammoun , Hamza Soury , Mounir Hamdi , Mohamed-Slim Alouini

In the context of emerging sixth-generation (6G) wireless networks, reconfigurable intelligent surfaces (RISs) are gaining prominence for their ability to intelligently control electromagnetic wave propagation and enhance backhaul…

Information Theory · Computer Science 2025-11-13 Al Nahian Mugdho , Md. Ibrahim , A. S. M. Badrudduza , Md. Abdur Rakib , Imran Shafique Ansari

Reconfigurable intelligent surface (RIS) is a promising technology to avoid signal blockage by creating virtual line-of-sight (LOS) connectivity for free-space optical (FSO) and radio frequency (RF) wireless systems. This paper considers a…

Information Theory · Computer Science 2021-08-17 Vinay Kumar Chapala , S. M. Zafaruddin

Reconfigurable Intelligent Surface (RIS) has becoming a useful tool in future wireless communication systems for close-distance communication network. This paper we use Reconfigurable Intelligent Surface (RIS) for downlink multi-user…

Information Theory · Computer Science 2021-02-02 RuiTianYi Lu
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