Results 21 to 30 of about 423,662 (248)
IEEE Access, 2022 In this study, a kind of nonlinear stochastic-resonance (SR) signal enhancement technique combined with the distributed receiving array signal power spectrum combination approach is proposed.
Di He +3 more
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OLBS: Offline Location Based Services [PDF]
2011 Fifth International Conference on Next Generation Mobile Applications, Services and Technologies, 2011 Most existing location-based services rely on ubiquitous connectivity to deliver location-based contents to the users. However, connectivity is not available anywhere at anytime even in urban centres. Underground, indoors, remote areas, and foreign countries are examples situations where users commonly do not have guaranteed connectivity but could ...
Pedro Coelho +2 more
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Hall of Mirrors: A Novel Strategy to Address Locality in Geocoded-Based PoI Private Queries
IEEE Access, 2022 Location privacy techniques try to protect user’s information by altering, aggregating or generalizing it. Geographical codification techniques, like Geohash, can be used to protect individual locations altering the precision of the location so it
Pedro Wightman +3 more
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, 2011 This chapter provides an overview of location-based services and insight into the pivotal importance of location-sensitivity to the success of wireless data services. This chapter argues that mass-market adoption of wireless data services will only occur if these services enhance productivity and/or convenience for end-users; transforming novelty into ...
Alexander Zipf, Matthias M. Jöst
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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 +5 more
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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 +9 more
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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 +4 more
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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 +4 more
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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
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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 +4 more
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