Results 81 to 90 of about 17,373 (186)

LOS and NLOS identification in real indoor environment using deep learning approach

Digital Communications and Networks
Visibility conditions between antennas, i.e. Line-of-Sight (LOS) and Non-Line-of-Sight (NLOS) can be crucial in the context of indoor localization, for which detecting the NLOS condition and further correcting constant position estimation errors or ...
Alicja Olejniczak, Olga Blaszkiewicz, Krzysztof K. Cwalina, Piotr Rajchowski, Jaroslaw Sadowski   +4 more
doaj   +1 more source

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

AI‐Enhanced Signal Detection and Channel Estimation for Beyond 5G and 6G Wireless Networks

Transactions on Emerging Telecommunications Technologies, Volume 36, Issue 12, December 2025.
This paper introduces deep learning‐based methods for channel estimation and signal detection in ma‐MIMO systems, significantly improving performance. FF‐PCNet enhances channel estimation with 40.2% lower error, and LSTM‐DetNet and FF‐DetNet signal detection methods, which achieve superior signal detection with up to 99.993% SER performance and reduced
Muhammad Yunis Daha, Bibin Babu, Rizwan Qureshi, Muhammad Usman Hadi   +3 more
wiley   +1 more source

The κ−μ$$ \kappa -\mu $$/Gamma‐Rayleigh Fading Model: A Composite Fading Model for Powerline‐Wireless Communication Channels

International Journal of Communication Systems, Volume 38, Issue 17, 25 November 2025.
Fading effects in radio communication systems are often modelled using statistical distributions. Some distributions are derived based on physical channel properties. In contrast, others are adapted from statistics and applied to channel modelling based on their goodness‐of‐fit to measurements or on their mathematical simplicity.
Kealeboga Mokise, Hermanus C. Myburgh
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

Variability of a Non‐Centrosymmetric Tecto‐Borosulfate: Introduction of Various Molecular Cations into BiX[B(SO4)2]4 (X  =  H3O+, NO2+, NH4+, NO+)

Chemistry – A European Journal, Volume 31, Issue 61, November 3, 2025.
To date, Bi(H3O)[B(SO)2]4 is only the second structure type containing a 3D anion within borosulfate chemistry. In this contribution three more representatives were synthesized, formally replacing oxonium by the molecular cations nitrosonium, nitronium, and ammonium. The structures crystallize homeotypically to the very first compound.
Erich Turgunbajew, Matthias Hämmer, Lkhamsuren Bayarjargal, Florian Pielnhofer, Henning A. Höppe   +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

Effects of Bandwidth on Millimeter Wave Channel Characteristics and Modeling Analysis in Indoor Scenarios

Radio Science, Volume 60, Issue 10, October 2025.
Abstract This paper presents wideband indoor channel measurements in three of the millimeter wave (mmWave) bands for the fifth generation (5G) and beyond 5G (B5G) wireless systems. Measurements were conducted at the Ka‐band (36–41 GHz) and V‐band (50–75 GHz) in office and factory/industrial environments, using Durham University's custom‐designed ...
Amar Al‐jzari, Sana Salous
wiley   +1 more source

On the Performance of Downlink Channel Estimation‐Based Cell‐Free Massive MIMO Systems Under Correlated Rician Fading Channels

Engineering Reports, Volume 7, Issue 8, August 2025.
The impact of downlink channel estimation on the achievable spectral efficiency in downlink cell‐free massive MIMO systems is investigated. A generic optimization‐based joint pilot assignment algorithm is proposed to maximize the sum*spectral efficiency. ABSTRACT The prevailing research on cell‐free massive multiple‐input multiple‐output (MIMO) systems
Jiarui Li, Yao Zhang, Fengjiao Gan, Na Liu, Longxiang Yang, Hongbo Zhu   +5 more
wiley   +1 more source

Pengaruh Fading Lintasan Jamak Terhadap Performansi High Speed Downlink Packet Access (Hsdpa) [PDF]

, 2013
HSDPA adalah sebuah teknologi komunikasi bergerak yang berteknologi 3,5G (third and half generation) yang termasuk dalam keluarga teknologi High-Speed Packet Acces (HSPA) yang mampu meningkatkan kecepatan transfer data mencapai 14,4 Mbps untuk download ...
Ir. Sigit Kusmaryanto, M.Eng., Aindyta Ayu Pradani., Dr. Ir. Sholeh Hadi pramono, MS
core