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| Author | : Kejie Qiu |
| Publisher | : |
| Total Pages | : 55 |
| Release | : 2015 |
| Genre | : Indoor positioning systems (Wireless localization) |
| ISBN | : |
| Author | : Mohsen Kavehrad |
| Publisher | : CRC Press |
| Total Pages | : 136 |
| Release | : 2019-11-18 |
| Genre | : Science |
| ISBN | : 1000712478 |
This book demonstrates the research on VLC based indoor localization in four aspects: first, it constructs the concept and model of the system; second, positioning algorithms, as the main issue in indoor localization, are detailed; third, many approaches are proposed to further improve the positioning performance; fourth, challenges will be detailed. Impulse response with multipath reflections are analyzed. Orthogonal frequency division multiplexing (OFDM) is proposed, and positioning performance is largely improved compared to On-off-keying (OOK) modulation. The readers will get a broad view of VLC based indoor localization from the background to the future challenges.
| Author | : Wenjun Gu |
| Publisher | : |
| Total Pages | : |
| Release | : 2016 |
| Genre | : |
| ISBN | : |
With the rapid development of Global Positioning Systems (GPS), the field location based services (LBS) is getting more and more attention. For indoor environments, LBS has a wide application for both civil and industrial areas. To make indoor LBS available, positioning technology has become a popular research topic in recent years. This dissertation investigates several indoor positioning topics based on visible light communication (VLC).First, it demonstrates the motivation to realize indoor LBS. Second, several positioning approaches are introduced to provide the location information. Positioning systems such as wireless local access network (WLAN), Zigbee, Bluetooth and radio frequency identification (RFID) are addressed. Third, fundamentals of VLC technology is detailed by explaining the light emitting diode (LED) as the transmitter, the photodiode (PD) as the receiver and the channel direct current (DC) gain considering the line-of-sight (LOS) condition. Visible light positioning systems are realized with lateration techniques based on received signal strength (RSS) information detected by PD. Two channel access methods are detailed and their advantages and disadvantages are analyzed. When height information of the receiver is unknown, three dimensional positioning is realized with an iterative algorithm based on the pre-estimation of the vertical coordinates. In order to further improve the positioning accuracy and alleviate the effect of large deviations, Kalman filter, particle filter as well as Gaussian mixture sigma point particle filter (GM-SPPF) are applied for both 2-D and 3-D scenarios. Considering the vertical accuracy cannot be improved largely from the filtering techniques, a nonlinear estimation algorithm is proposed based on a trust region algorithm.Multipath propagation is one of the most important factors that affects the performance of indoor positioning systems. In this dissertation, impulse response with multipath reflections are analyzed with the combined deterministic and modified Monte Carlo (CDMMC) algorithm. The received optical power from different LED bulbs and the positioning accuracy for the entire room is detailed. Orthogonal frequency division multiplexing (OFDM) is also proposed in the positioning system, considering OFDM performs well when multipath reflections exist. Positioning performance is largely improved with OFDM compared to On-off-keying (OOK) modulation. Finally, conclusions and future works are described in Chapter 9.
| Author | : Jian Dong |
| Publisher | : Springer Nature |
| Total Pages | : 806 |
| Release | : 2023-04-23 |
| Genre | : Technology & Engineering |
| ISBN | : 9819904161 |
This book includes original, peer-reviewed research papers from the International Conference on Internet of Things, Communication and Intelligent Technology (IoTCIT) 2022. It contains the application of communication and IoT engineering in the age of intelligent technology+ from the standpoint of disciplinary integration, combining theory and associated IoT and intelligent technology algorithms. The topics cover the full range of IoT solutions, from IoT to network security, and focus on many forms of communication, such as Next Generation (6G) Mobile Communication, D2D, and M2M Communication. Additionally, it examines Intelligent Technology, with a focus on Information System Modeling and Simulation. It also explores Cloud Computing, Pervasive and Mobile Computing, Distributed Computing, High Performance Computing, and Ubiquitous Computing.
| Author | : Management Association, Information Resources |
| Publisher | : IGI Global |
| Total Pages | : 615 |
| Release | : 2017-06-19 |
| Genre | : Computers |
| ISBN | : 1522525904 |
Ongoing advancements in modern technology have led to significant developments with smart technologies. With the numerous applications available, it becomes imperative to conduct research and make further progress in this field. Smart Technologies: Breakthroughs in Research and Practice provides comprehensive and interdisciplinary research on the most emerging areas of information science and technology. Including innovative studies on image and speech recognition, human-computer interface, and wireless technologies, this multi-volume book is an ideal source for researchers, academicians, practitioners, and students interested in advanced technological applications and developments.
| Author | : B.B.V.L. Deepak |
| Publisher | : Springer Nature |
| Total Pages | : 968 |
| Release | : 2022-10-05 |
| Genre | : Technology & Engineering |
| ISBN | : 981194606X |
This book presents select proceedings of the 3rd Innovative Product Design and Intelligent Manufacturing System (IPDIMS 2020), held at National Institute of Technology (NIT) Rourkela, 30–31 December 2021. This volume covers the latest research topics in design and manufacturing fields of engineering. Some of the themes covered include Industry 4.0, smart manufacturing, advanced robotics and CAD/CAM/CIM. This book will be useful for students, researchers and professionals in the disciplines of mechatronics, mechanical, manufacturing, production and industrial engineering, especially those working on improvements in manufacturing technologies and development of resilient infrastructure in industry.
| Author | : Zening Li |
| Publisher | : |
| Total Pages | : 97 |
| Release | : 2016 |
| Genre | : Indoor positioning systems (Wireless localization) |
| ISBN | : 9781369656923 |
Indoor positioning systems provide location based service within buildings. Because the Global Positioning System is usually unavailable in indoor environment, other positioning technologies making use of optical, radio or even acoustic techniques are used for indoor positioning application. In this dissertation, an indoor visible light communication positioning system using a smartphone with rolling shutter camera is proposed. The LED transmits periodical signals with different frequencies high enough to avoid flickering as its optical tags. The camera exploits the rolling shutter effect to detect the fundamental frequency of optical signals. This kind of systems use smartphone camera as the receiver with no requirement of extra hardware. And at the same time, the optical communication link allows a date rate much higher than the frame rates of traditional optical camera communication. For the work of this research topic carried out so far, the roles of camera parameters determining rolling effect performance are studied and a technique to measure the camera readout time per column is presented. Factors limiting the detectable frequency range is explained based on the discussion of rolling shutter mechanism. Followed is the analysis of frequency detection reliability and resolution with Fourier spectrum analysis.
| Author | : Amr Mohamed |
| Publisher | : Springer |
| Total Pages | : 265 |
| Release | : 2015-05-24 |
| Genre | : Technology & Engineering |
| ISBN | : 3319196952 |
This volume contains the proceedings of the 6th International Symposium on Ambient Intelligence (ISAmI 2015), held in Salamanca, Spain on June 3th-5th at the University of Salamanca. After a careful review, 27 papers from 10 different countries were selected to be presented in ISAmI 2015 at the conference and published in the proceedings. ISAmI has been running annually and aiming to bring together researchers from various disciplines that constitute the scientific field of Ambient Intelligence to present and discuss the latest results, new ideas, projects and lessons learned, namely in terms of software and applications and aims to bring together researchers from various disciplines that are interested in all aspects of this area. Ambient Intelligence is a recent paradigm emerging from Artificial Intelligence, where computers are used as proactive tools assisting people with their day-to-day activities, making everyone’s life more comfortable. Another main concern of AmI originates from the human computer interaction domain and focuses on offering ways to interact with systems in a more natural way by means user friendly interfaces. This field is evolving quickly as can be witnessed by the emerging natural language and gesture based types of interaction.
| Author | : |
| Publisher | : |
| Total Pages | : 6 |
| Release | : |
| Genre | : |
| ISBN | : |
A versatile outdoor and indoor position detection mobile prototype has been successfully constructed and tested. The receiver consists of a GPS module, a GSM shield, a visible-light data receiver, and two ultrasonic sensors, all controlled by an Arduino Mega and an Arduino Uno microcontroller. Each ultrasonic sensor detects distance in the X and Y axis respectively. The transmitter system consists of four LED shields each attached to an Arduino Uno which is programmed to transmit the global position relevant to the indoor position of the LED lamp. When a person is outdoors, the GPS module receives global position from the satellite. When a person goes indoors, his or her global position will be given by the LEDs and ultrasound sensors. The location data can be transmitted via GSM to a monitoring system or to an individual smartphone. This system is extremely useful in elderly care service. It ensures specific accuracy in locating senior citizens during cases of emergency.
| Author | : Weizhi Zhang |
| Publisher | : |
| Total Pages | : |
| Release | : 2014 |
| Genre | : |
| ISBN | : |
Indoor positioning has become an attractive research topic within the past two decades. However, no satisfying solution has been found with consideration of both accuracy and system complexity. Recently, research on visible light communications offers new opportunities on realizing accurate indoor positioning with relatively simple system configuration. This dissertation investigates several fundamental research topics of indoor positioning systems based on visible light communications (VLC) technology.First, we introduce a simulation method to generate optical wireless channel impulse response more efficiently and accurately, based on which a novel 2-D positioning algorithm is developed. Using basic framed slotted ALOHA (BFSA) protocol, it successfully addresses channel multi-access issue, removing synchronization requirement on the transmitters. The algorithm makes use of received signal strength (RSS) to calculate the ranges from receiver to light-emitting diode (LED) bulbs, after which trilateration is performed to obtain estimation of the receiver's location. Simulation results show that, with over 95% confidence, the target receiver can be located with an accuracy of 5.9 cm, assuming indirect sunlight exposure and proper installation of LED bulbs. The dissertation also explores one of the main digital signal processing techniques available: digital filters. Three filtering techniques are employed to improve the positioning accuracy: Kalman filter, sequential importance-resampling particle filter (SIR-PF) and Gaussian mixture sigma-point particle filter (GM-SPPF). Filtering techniques are used to form the trajectory of the receiver while rejecting wild values which are large deviations from correct measurements. Results show that filters help increase the positioning accuracy and Gaussian mixture sigma-point particle filter (GM-SPPF) outperforms other filters such as basic Kalman filter and particle filter (SIR-PF), at a reasonable computational cost. 3-D positioning algorithm is then proposed to keep track of the receiver's height. Simulation results show that the height of receiver can be estimated as accurately as within ten centimeters. Results also show that the estimation is more accurate when light distribution from LED bulbs involved are uniform.Finally, sensor fusion technology is adopted as a solution to blockage problem and an option to further improve the positioning accuracy.
