Results 81 to 90 of about 17,521 (206)

Measurement and Statistical Analysis of Distinguishable Multipaths in Underground Tunnels

International Journal of Antennas and Propagation, 2020
Compared with the line-of-sight (LOS) condition, the multipath effect is more serious in the non-line-of-sight (NLOS) condition. Therefore, the LOS and NLOS identification is necessary for the multipath analysis of signal propagation.
Junchang Sun, Shuai Ma, Hui Zhou, Chun Du, Shiyin Li   +4 more
doaj   +1 more source

A Nonstationary Geometry‐Based Model for Channel Characterisation in Vactrains Scenarios Using Leaky Coaxial Cables

IET Microwaves, Antennas &Propagation, Volume 20, Issue 1, January/December 2026.
In this paper, a 3D multi‐source GBSM model is proposed for the vacuum tube scenario using LCX. By equating the periodic slots to multiple magnetic dipole antennas, the electric field distribution of LCX is deduced, and the CIR expression is derived. Based on this, the multi‐link spatial‐temporal correlations, including the spatial CCF and temporal ACF,
Kai Wang, Jiahui Qiu, Jiachi Zhang, Liu Liu, Tao Zhou   +4 more
wiley   +1 more source

Deep Reinforcement Learning Reconfigurable Smart Surface Sensing MAC Protocol for Terahertz Mesh Networks

IET Networks, Volume 15, Issue 1, January/December 2026.
This paper proposes a reconfigurable intelligent surface‐based deep reinforcement learning MAC (RIS‐DRL‐MAC) protocol for terahertz mesh networks. By embedding RIS perception into the MAC decision loop and using a distributed TD3 algorithm, the proposed scheme achieves a cross‐layer optimisation of beam direction, access timing and RIS phase control ...
Wenjian Zhang, Ping Li
wiley   +1 more source

An Indoor Robust Localization Algorithm Based on Data Association Technique

Sensors, 2020
As a key technology of the Internet of Things, wireless sensor network (WSN) has been used widely in indoor localization systems. However, when the sensor is transmitting signals, it is affected by the non-line-of-sight (NLOS) transmission, and the ...
Long Cheng, Yong Wang, Mingkun Xue, Yangyang Bi   +3 more
doaj   +1 more source

A Normalization Model for Analyzing Multi-Tier Millimeter Wave Cellular Networks

, 2018
Based on the distinguishing features of multi-tier millimeter wave (mmWave) networks such as different transmit powers, different directivity gains from directional beamforming alignment and path loss laws for line-of-sight (LOS) and non-line-of-sight ...
Bai, Zhiquan, Han, Tao, Kwak, Kyung Sup, Li, Qiang, Wang, Jiang, Wang, Lijun, Xiong, Siqing   +6 more
core   +1 more source

A Multiple Scattering Channel Model for Ultraviolet Signal Propagation in the Atmosphere

IET Optoelectronics, Volume 20, Issue 1, January/December 2026.
We propose an accurate multiple scattering channel model for ultraviolet (UV) signal that propagates in the atmosphere with incorporating the variation of the refractive index structure parameter with altitude and the relative height between UV transmitter and receiver that are often ignored by the previous works.
Xianrui Jian, Qingfeng Wu
wiley   +1 more source

Reducing Bias for Closed‐Form TDOA Localization in Unified Near‐Field and Far‐Field Model

IET Signal Processing, Volume 2026, Issue 1, 2026.
Bias is a fundamental metric for evaluating the average error of an estimator, where lower bias indicates an estimator closer to the true value. Recent studies on time difference of arrival (TDOA) localization have introduced the modified polar representation (MPR) to unify near‐field and far‐field scenarios, enhancing robustness to the source range ...
Zhongwen Chen, Xinlei Wang, Yimao Sun, Beichuan Tang, Benjian Hao, Yanbing Yang, Liangyin Chen, Li Chai   +7 more
wiley   +1 more source

A Systematic Review of VANET Routing Protocols for Intelligent Transport Systems (ITSs)

Journal of Advanced Transportation, Volume 2026, Issue 1, 2026.
The swift improvement of wireless communication technology has aided the creation of vehicular ad hoc networks (VANETs) as a revolutionary option for the realization of intelligent transportation systems (ITSs). VANETs facilitate seamless communication between vehicles and infrastructure (V2I) and among the vehicles themselves (V2V). These networks can
Roopa Tirumalasetti, Sunil Kumar Singh, Pradeep Kumar Roy, Sanket Mishra, Linlin You   +4 more
wiley   +1 more source

A Stochastic Geometry Framework for LOS/NLOS Propagation in Dense Small Cell Networks

, 2015
The need to carry out analytical studies of wireless systems often motivates the usage of simplified models which, despite their tractability, can easily lead to an overestimation of the achievable performance.
Doyle, Linda, Galiotto, Carlo, Marchetti, Nicola, Pratas, Nuno K.   +3 more
core   +1 more source

A Multiagent Deep Reinforcement Learning Scheme for Energy Use Optimization in UAV‐Enabled Wireless Networks With Reconfigurable Intelligent Surfaces

International Journal of Intelligent Systems, Volume 2026, Issue 1, 2026.
This work introduces a multiagent deep reinforcement learning (MADRL) framework for energy harvesting (EH) in unmanned aerial vehicle (UAV) networks aided by reconfigurable intelligent surfaces (RIS). The core goal is to maximize quantities of harvested energy subject to quality of service (QoS) constraints in dynamic wireless setups.
Syed Mohsin Bokhari, Muhammad Shafi, Sarmad Sohaib, Sanad Al Maskari, Muhammad Ahsan Iftikhar, Kallol Mohanta   +5 more
wiley   +1 more source