Results 41 to 50 of about 1,041 (172)

Review and Analysis of Digital Signal Processing Algorithms for Coherent Optical Satellite Links

International Journal of Satellite Communications and Networking, Volume 43, Issue 3, Page 229-250, May/June 2025.
ABSTRACT Coherent optical satellite links enable high‐throughput communication and high accuracy ranging to and between satellites. Due to the ever‐increasing demand for throughput, wavelength division multiplexing of polarization multiplexed optical signals is being considered as a solution to provide high‐speed optical satellite links.
Carl Valjus, Raphael Wolf, Juraj Poliak
wiley   +1 more source

Statistics of Received Power Time Series for Optical LEO Satellite Uplinks

International Journal of Satellite Communications and Networking, Volume 43, Issue 3, Page 251-263, May/June 2025.
ABSTRACT In free‐space optical satellite communications, a transmitted optical signal is perturbed by pointing inaccuracies and through the atmosphere's index‐of‐refraction turbulence. This leads to signal fluctuations and power fading when detected by a receiver. Knowledge of these signal instability statistics is advantageous for the design of robust
Andrea Carrillo‐Flores, Dirk Giggenbach, Marcus T. Knopp   +2 more
wiley   +1 more source

Prolonged grief symptoms and lingering attachment predict approach behavior toward the deceased

Journal of Traumatic Stress, Volume 38, Issue 2, Page 284-295, April 2025.
Abstract Following the death of a loved one, both approach behaviors related to the deceased (i.e., engagement with feelings, memories, and/or reminders of the deceased) and the avoidance of reminders of the death are theorized to precipitate severe and persistent grief reactions, termed prolonged grief.
Maarten C. Eisma, Thomas A. de Lang, Katerina Christodoulou, Lara O. Schmitt, Paul A. Boelen, Peter J. de Jong   +5 more
wiley   +1 more source

Advancing Medical Research Through Artificial Intelligence: Progressive and Transformative Strategies: A Literature Review

Health Science Reports, Volume 8, Issue 2, February 2025.
ABSTRACT Background and Aims Artificial intelligence (AI) has become integral to medical research, impacting various aspects such as data analysis, writing assistance, and publishing. This paper explores the multifaceted influence of AI on the process of writing medical research papers, encompassing data analysis, ethical considerations, writing ...
Ahmad R. Al‐Qudimat, Zainab E. Fares, Mai Elaarag, Maha Osman, Raed M. Al‐Zoubi, Omar M. Aboumarzouk   +5 more
wiley   +1 more source

Performansi Automatic Repeat Request (ARQ) pada Pengendalian Kesalahan dalam Komunikasi Data, [PDF]

, 2012
Pentransmisian frame adalah hal yang harus diperhatikan dalam untuk membangun sistem komunikasi data yang handal. Dalam penerapannya, pentransmisian frame ini diatur oleh suatu metode atau mekanisme yang disebut Automatic Repeat Request (ARQ).
Arif, Samsul
core  

Cross-Layer Designs and Analysis of Adaptive-Rate Transmission and ARQ for Free-Space Optical Communications

IEEE Photonics Journal, 2016
The impact of atmospheric turbulence is one of the most challenging issues for the widespread deployment of free-space optical (FSO) communication systems. To enhance the systems' performance, adaptive-rate (AR) transmission and automatic repeat request (
Vuong V. Mai, Anh T. Pham
doaj   +1 more source

Variations in Wireless Network Topology Inference: Recent Evolution, Challenges, and Directions

IET Communications, Volume 19, Issue 1, January/December 2025.
This paper first presents an overview of the basic concepts and significance of network topology inference, followed by a brief review of cooperative methods. It then provides a comprehensive summary of non‐cooperative methods. To facilitate performance comparison, a unified dataset and evaluation metrics are employed to analyse four representative non‐
Wenbo Du, Jun Cai, Weijun Zeng, Xiang Zheng, Huali Wang, Lei Zhu   +5 more
wiley   +1 more source

Performance Modeling of LTP-HARQ Schemes Over OSTBC-MIMO Channels for Hybrid Satellite Terrestrial Networks

IEEE Access, 2018
Recently, with the development of Ka-band high throughput satellites and hybrid satellite-terrestrial networks, distributed/virtual multiple-input multiple-output (MIMO) technology over satellites have attracted considerable research interest.
Jian Jiao, Youjun Hu, Qinyu Zhang, Shaohua Wu   +3 more
doaj   +1 more source

Analysis of channel uncertainty in ARQ relay networks. [PDF]

PLoS ONE, 2018
Several power allocation algorithms for cooperative relay networks are presented in the literature. These contributions assume perfect channel knowledge and capacity achieving codes. However in practice, obtaining the channel state information at a relay
Hina Ajmal, Aimal Khan, Saad Rehman, Farhan Hussain, Mohammad Alam, Rupert Young   +5 more
doaj   +1 more source

Joint Physical Layer Security and Information Freshness Analysis and Optimization for RIS‐Assisted ISAC With Finite Blocklength

International Journal of Intelligent Systems, Volume 2025, Issue 1, 2025.
Aiming to address the security and timeliness challenges in reconfigurable intelligent surface (RIS)‐assisted integrated sensing and communication (ISAC) system with finite blocklength (FBL), this paper jointly investigates the communication security, sensing security, and information freshness performance of the system in the presence of communicating
Wei Zhao, Jianxin Ni, Baogang Li, Shuai Hao, Qinghe Zheng   +4 more
wiley   +1 more source