Results 71 to 80 of about 17,699 (203)

A RSSI/PDR-Based Probabilistic Position Selection Algorithm with NLOS Identification for Indoor Localisation

ISPRS International Journal of Geo-Information, 2018
In recent years, location-based services have been receiving increasing attention because of their great development prospects. Researchers from all over the world have proposed many solutions for indoor positioning over the past several years.
Ke Han, Huashuai Xing, Zhongliang Deng, Yichen Du   +3 more
doaj   +1 more source

Wireless Backhaul Node Placement for Small Cell Networks

, 2014
Small cells have been proposed as a vehicle for wireless networks to keep up with surging demand. Small cells come with a significant challenge of providing backhaul to transport data to(from) a gateway node in the core network.
Islam, Muhammad Nazmul, Koymen, Ozge, Maharshi, Atul, Mandayam, Narayan B., Sampath, Ashwin   +4 more
core   +1 more source

Secure Transmission in ISAC Systems Aided by Active STAR‐RIS

IET Communications, Volume 20, Issue 1, January/December 2026.
This paper investigates the secure transmission problem in an active simultaneous transmitting and reflecting intelligent reflecting surfaces (STAR‐RIS)‐aided integrated sensing and communication downlink system. Our objective is to maximize the sum secrecy rate by jointly optimizing the base station beamforming vectors, the sensing signal covariance ...
Baofeng Ji, Xinhao Guo, Shahid Mumtaz
wiley   +1 more source

Experimental demonstration of non-line-of-sight visible light communication with different reflecting materials using a GaN-based micro-LED and modified IEEE 802.11ac

AIP Advances, 2018
This paper gives an experimental demonstration of non-line-of-sight (NLOS) visible light communication (VLC) using a single 80 μm gallium nitride (GaN) based micro-light-emitting diode (micro-LED).
Zhijian Lu, Pengfei Tian, Houqiang Fu, Jossue Montes, Xuanqi Huang, Hong Chen, Xiaodong Zhang, Xiaoyan Liu, Ran Liu, Lirong Zheng, Xiaolin Zhou, Erdan Gu, Yi Liu, Yuji Zhao   +13 more
doaj   +1 more source

Comparative Study Between Measurement and Predictions Using Geometrical Optics and Uniform Theory of Diffraction for Case of Non-Line-of-Sight (NLOS) in Indoor Environment [PDF]

Wireless Personal Communications, 2012
This paper describes the investigation and comparison of the accuracy of a deterministic model for a WLAN system in the indoor environment. The measurement system consisted of a spectrum analyzer and a log-periodic antenna. Non-line-of-sight (NLOS) propagation (in furnished rooms) was investigated.
Cheng, Ee Meng, Abbas, Zulkifly, Abd Malek, Mohd Fareq, Lee, Kim Yee, You, Kok Yeow, Khor, Shing Fhan   +5 more
openaire   +2 more sources

Near‐Field 3D Stochastic Channel Modelling and Performance Analysis for Cooperative STAR‐RIS Systems With Cylindrical Transmit Arrays

IET Communications, Volume 20, Issue 1, January/December 2026.
This paper develops a near‐field three‐dimensional geometry‐based stochastic channel model for cooperative STAR‐RIS systems equipped with cylindrical transmit arrays at the base station. The proposed model captures spherical wavefront propagation effects and coupled azimuth‐elevation characteristics under realistic near‐field conditions.
Antwi Owusu Agyeman, Tweneboah‐Koduah Samuel, Ruhiya Abubakar, Martin Alabi Mensah, Emmanuel Atebawone, Anim Frederick Oturoku   +5 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

Energy‐Efficient Element Selection in RIS‐Assisted Backscatter Communication Systems

IET Communications, Volume 20, Issue 1, January/December 2026.
This paper investigates energy‐efficient reconfigurable intelligent surface (RIS) assisted ambient backscatter communication systems with energy‐harvesting tags. A low‐complexity RIS element selection strategy is developed to satisfy both energy‐harvesting and signal‐to‐interference‐plus‐noise ratio constraints while minimizing overall power ...
Mengistu A. Mulatu, Thembelihle Dlamini, Asrat M. Beyene   +2 more
wiley   +1 more source

Spatio‐Temporal cGAN Based Channel Estimation for Low‐Altitude Integrated Sensing and Communication Systems

Electronics Letters, Volume 62, Issue 1, January/December 2026.
Reliable channel estimation in low‐altitude ISAC is challenged by UAV‐induced fast‐varying and non‐stationary channels. We present an ST‐cGAN framework that jointly models spatial and temporal features under conditional adversarial learning, achieving superior accuracy and robustness compared with conventional and deep learning baselines.
Guixin Pan, Honghui Xu, Yixuan Wang, Kang Kang, Wenbin Li, Tianyi Liu   +5 more
wiley   +1 more source

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