Results 21 to 30 of about 4,690,775 (224)

3-D Spatial Spectrum Fusion Indoor Localization Algorithm Based on CSI-UCA Smoothing Technique

IEEE Access, 2018
In the indoor wireless localization environment, the non-line-of-sight receiving signal and low signal-to-noise ratio are usually strongly dominant issues due to the heavy existence of multipath signals, which also restrict the final wireless ...
Di He, Taha Bouras, Xin Chen, Wenxian Yu, Yi Zhang, Yueming Yang   +5 more
doaj   +1 more source

BDS-3 Integrity Risk Modeling and Probability Evaluation

Remote Sensing, 2022
Focusing on the global integrity monitoring performance of the BDS-3, the integrity failure model and effect analysis (IFMEA) of the system space segment and the ground control segment were carried out, and the system integrity risk tree model was ...
Lei Chen, Weiguang Gao, Zhigang Hu, Yueling Cao, Ling Pei, Cheng Liu, Wei Zhou, Xuanzuo Liu, Liang Chen, Ronghua Yang   +9 more
doaj   +1 more source

A State Optimization Model Based on Kalman Filtering and Robust Estimation Theory for Fusion of Multi-Source Information in Highly Non-linear Systems

Sensors, 2019
Consistent state estimation is a vital requirement in numerous real life applications from localization to multi-source information fusion. The Kalman filter and its variants have been successfully used for solving state estimation problems.
Muhammad Adeel Akram, Peilin Liu, Muhammad Owais Tahir, Waqas Ali, Yuze Wang   +4 more
doaj   +1 more source

Trajectory Representation in Location-Based Services: Problems and Solution [PDF]

, 2003
Recently, much work has been done in feasibility studies on services offered to moving objects in an environment equipped with mobile telephony, network technology and GIS.
By, Rolf A. de, Meratnia, Nirvana
core   +3 more sources

Vector Graph Assisted Pedestrian Dead Reckoning Using an Unconstrained Smartphone

Sensors, 2015
The paper presents a hybrid indoor positioning solution based on a pedestrian dead reckoning (PDR) approach using built-in sensors on a smartphone. To address the challenges of flexible and complex contexts of carrying a phone while walking, a robust ...
Jiuchao Qian, Ling Pei, Jiabin Ma, Rendong Ying, Peilin Liu   +4 more
doaj   +1 more source

User location privacy protection mechanism for location-based services

Digital Communications and Networks, 2021
With the rapid development of the Internet of Things (IoT), Location-Based Services (LBS) are becoming more and more popular. However, for the users being served, how to protect their location privacy has become a growing concern.
Yan He, Jiageng Chen
doaj   +1 more source

Differentially Private Location Privacy-preserving Scheme withSemantic Location [PDF]

Jisuanji kexue, 2021
How to realize more reasonable noise addition in location differential privacy-preserving is a hot topic issue.However,adding the same amount of noise in different locations will result in the decrease of service availability and privacy preservation.To ...
ZHANG Xue-jun, YANG Hao-ying, LI Zhen, HE Fu-cun, GAI Ji-yang, BAO Jun-da
doaj   +1 more source

A new splitting-based displacement prediction approach for location-based services [PDF]

, 2011
In location-based services (LBSs), the service is provided based on the users' locations through location determination and mobility realization.
Al-Fayoumi, Mustafa, Ayesh, Aladdin, Daoud, Mohammad Sh., Hopgood, Adrian A.   +3 more
core   +3 more sources

Improvement of Noise Uncertainty and Signal-To-Noise Ratio Wall in Spectrum Sensing Based on Optimal Stochastic Resonance

Sensors, 2019
Noise uncertainty and signal-to-noise ratio (SNR) wall are two very serious problems in spectrum sensing of cognitive radio (CR) networks, which restrict the applications of some conventional spectrum sensing methods especially under low SNR ...
Di He, Xin Chen, Ling Pei, Lingge Jiang, Wenxian Yu   +4 more
doaj   +1 more source

Differential Privacy Preservation for Location Semantics

Sensors, 2023
With the rapid development of intelligent mobile terminals and communication technologies, location-based services (LBSs) have become an essential part of users’ lives. LBS providers upload and share the collected users’ location data.
Liang Yan, Lei Li, Xuejiao Mu, Hao Wang, Xian Chen, Hyoseop Shin   +5 more
doaj   +1 more source