Results 31 to 40 of about 169,205,538 (184)

Non-Line-of-Sight Moving Target Detection Method Based on Noise Suppression

Remote Sensing, 2022
At the present time, most of existing security systems only detect and track targets in line-of-sight (LOS). However, in practice, the locations of targets are often out of the line of sight.
Yilin Wei, Bing Sun, Yuetong Zhou, Haochuan Wang   +3 more
doaj   +1 more source

CNN‐DDQN Spatial Learning for Fractional Frequency Reuse Optimization in 5G Heterogeneous Networks

Engineering Reports, Volume 8, Issue 7, July 2026.
This study proposes a spatially aware DRL framework that uses multichannel network‐state tensors and a lightweight CNN‐DDQN architecture to capture interference patterns and user clustering in 5G heterogeneous networks (HetNets). The model is computationally efficient with only 7361 trainable parameters, achieving 115× faster execution and < 10 ms ...
Christian Onu, Abdulwaheed Musa, Olalekan Ogunbiyi, Lambe Mutalub Adesina, Bilkisu Jimada‐Ojuolape, Monsurat Balogun, Abdurrhaman Ademola Isa, Aliyu Ahmed, Ishmael Zibani, Adamu Murtala Zungeru   +9 more
wiley   +1 more source

CRLBs for WSNs localization in NLOS environment

EURASIP Journal on Wireless Communications and Networking, 2011
Determination of Cramer-Rao lower bound (CRLB) as an optimality criterion for the problem of localization in wireless sensor networks (WSNs) is a very important issue. Currently, CRLBs have been derived for line-of-sight (LOS) situation in WSNs. However,
Wang Peng, Huang Jiyan, Wan Qun
doaj  

Measurement-Based LoS/NLoS Channel Modeling for Hot-Spot Urban Scenarios in UMTS Networks

International Journal of Antennas and Propagation, 2014
A measurement campaign is introduced for modeling radio channels with either line-of-sight (LoS) or non-line-of-sight (NLoS) connection between user equipment (UE) and NodeB (NB) in an operating universal mobile telecommunications system.
Jiajing Chen, Xuefeng Yin, Li Tian, Nan Zhang, Yongyu He, Xiang Cheng, Weiming Duan, Silvia Ruiz Boqué   +7 more
doaj   +1 more source

Non‐Invasively Tracking an Arbitrary Deformable Object Through Scattering Media and Around Corners via Speckle Correlations

Advanced Science, Volume 13, Issue 34, 19 June 2026.
A speckle correlation centroid localization method (SCCLM) is proposed for non‐invasive tracking of an arbitrary deformable object through scattering media and around corners, requiring no prior information. Its effectiveness is demonstrated not only in tracking hidden objects beyond the memory effect region but also in following objects undergoing ...
Aiping Zhai, Wenjing Ji, Yan Wang, Xiyuan Luo, Wenjing Zhao, Dong Wang, Fei Liu   +6 more
wiley   +1 more source

A Joint Channel Modeling, Parameter Estimation and Geometry‐Based Indoor Localization for 5G Systems

Transactions on Emerging Telecommunications Technologies, Volume 37, Issue 6, June 2026.
We propose an end‐to‐end method to accurately localize mobile stations in indoor scenarios, such as those found in Industry 4.0. To this end, we jointly perform wireless channel modeling considering mmWave and MIMO technologies, parameter estimation in 3D, and simple and fine‐grained geometry‐based localization.
Paulo Francisco da Conceição, Rodrigo Pinto Lemos, Flávio Geraldo Coelho Rocha   +2 more
wiley   +1 more source

Protocol‐Agnostic Meta Key Distribution for Encrypted Wireless Communications Enabled by Space‐Time‐Coding Metasurface

Advanced Science, Volume 13, Issue 7, 3 February 2026.
This paper presents a programmable metasurface‐based Meta Key Distribution (MKD) system for secure, protocol‐independent key exchange in indoor wireless settings. By embedding entropy into the wireless channel, it enables lightweight, compatible cryptographic key generation.
Xinyu Li, Long Chen, Guanxiong Shen, Kezhan Zhao, Ze Gu, Qian Ma, Jian Wei You, Tie Jun Cui   +7 more
wiley   +1 more source

A Gaussian Process-Enhanced Non-Linear Function and Bayesian Convolution–Bayesian Long Term Short Memory Based Ultra-Wideband Range Error Mitigation Method for Line of Sight and Non-Line of Sight Scenarios

Mathematics
Relative positioning accuracy between two devices is dependent on the precise range measurements. Ultra-wideband (UWB) technology is one of the popular and widely used technologies to achieve centimeter-level accuracy in range measurement.
A. S. M. Sharifuzzaman Sagar, Samsil Arefin, Eesun Moon, Md Masud Pervez Prince, L. Minh Dang, Amir Haider, Hyung Seok Kim   +6 more
doaj   +1 more source

Multi‐Soliton Microcombs Enable Ultrafast Nanometric‐Precision Ranging and Photon‐Level Detection

Advanced Science, Volume 13, Issue 12, 27 February 2026.
Our work first demonstrates dual‐multi‐soliton ranging and confirms its multifunctional capability. The method achieves ultrafast and nanometric‐precision measurement. For practical applications, we further extend the multi‐soliton states to photon‐level ranging.
Jiawen Zhi, Xiaoyang Guo, Xusheng Yang, Brent E. Little, Sai T. Chu, Chenggang Shao, Mengyu Wang, Yan Liang, Peng Xie, Weiqiang Wang, Hanzhong Wu   +10 more
wiley   +1 more source

Efficient AOA Estimation and NLOS Signal Utilization for LEO Constellation-Based Positioning Using Satellite Ephemeris Information

Applied Sciences
As large-scale low Earth orbit (LEO) constellations continue to expand, the potential of their signal strength for positioning applications should be fully leveraged.
Junqi Guo, Yang Wang
doaj   +1 more source