RFID Localisation For Internet Of Things Smart Homes: A Survey

The Internet of Things (IoT) enables numerous business opportunities in fields as diverse as e-health, smart cities, smart homes, among many others. The IoT incorporates multiple long-range, short-range, and personal area wireless networks and technologies into the designs of IoT applications. Localisation in indoor positioning systems plays an important role in the IoT. Location Based IoT applications range from tracking objects and people in real-time, assets management, agriculture, assisted monitoring technologies for healthcare, and smart homes, to name a few. Radio Frequency based systems for indoor positioning such as Radio Frequency Identification (RFID) is a key enabler technology for the IoT due to its costeffective, high readability rates, automatic identification and, importantly, its energy efficiency characteristic. This paper reviews the state-of-the-art RFID technologies in IoT Smart Homes applications. It presents several comparable studies of RFID based projects in smart homes and discusses the applications, techniques, algorithms, and challenges of adopting RFID technologies in IoT smart home systems.Comment: 18 pages, 2 figures, 3 table

When the Industry Goes Wireless: Drivers, Requirements, Technology and Future Trends

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Large-scale Wireless Local-area Network Measurement and Privacy Analysis

The edge of the Internet is increasingly becoming wireless. Understanding the wireless edge is therefore important for understanding the performance and security aspects of the Internet experience. This need is especially necessary for enterprise-wide wireless local-area networks (WLANs) as organizations increasingly depend on WLANs for mission- critical tasks. To study a live production WLAN, especially a large-scale network, is a difficult undertaking. Two fundamental difficulties involved are (1) building a scalable network measurement infrastructure to collect traces from a large-scale production WLAN, and (2) preserving user privacy while sharing these collected traces to the network research community. In this dissertation, we present our experience in designing and implementing one of the largest distributed WLAN measurement systems in the United States, the Dartmouth Internet Security Testbed (DIST), with a particular focus on our solutions to the challenges of efficiency, scalability, and security. We also present an extensive evaluation of the DIST system. To understand the severity of some potential trace-sharing risks for an enterprise-wide large-scale wireless network, we conduct privacy analysis on one kind of wireless network traces, a user-association log, collected from a large-scale WLAN. We introduce a machine-learning based approach that can extract and quantify sensitive information from a user-association log, even though it is sanitized. Finally, we present a case study that evaluates the tradeoff between utility and privacy on WLAN trace sanitization

Coverage Range and Cost Comparison of Remote Antenna Unit Designs for Inbuilding Radio over Fiber Technology

Future communication needs to be ubiquitous, broadband, convergent, and seamless. Radio over fiber (RoF) technology is one of the most important enabler in access network for the technologies. Adoption of RoF faces bottleneck in optoelectronics, that they are still expensive, high power consumption, and limited in bandwidth. To solve the problem, transceiver in remote antenna unit (RAU) is developed, i.e. electroabsorption transceiver (EAT) and asymmetric FabryPerot modulator (AFPM). This paper compares their coverage range and cost in providing WCDMA and WLAN services. Needed gain of RF amplifier for supporting picocell is also discussed

From Map to Dist: the Evolution of a Large-Scale Wlan Monitoring System

The edge of the Internet is increasingly becoming wireless. Therefore, monitoring the wireless edge is important to understanding the security and performance aspects of the Internet experience. We have designed and implemented a large-scale WLAN monitoring system, the Distributed Internet Security Testbed (DIST), at Dartmouth College. It is equipped with distributed arrays of “sniffers” that cover 210 diverse campus locations and more than 5,000 users. In this paper, we describe our approach, designs and solutions for addressing the technical challenges that have resulted from efficiency, scalability, security, and management perspectives. We also present extensive evaluation results on a production network, and summarize the lessons learned

Comparative study of increasing indoor WLAN coverage by passive repeating systems

Abstract. Propagation of radio waves is interrupted while traveling through different materials. The architectural beautification and complexity by using various building materials cause attenuation of the signal via indoor, outdoor to indoor and vice versa wireless communications. It has been found that feeding more power to the transmitter or increasing sensitivity of the receiver is one of the solutions to overcome weak connectivity. However, this approach is not cost effective. Another concern is the ability to amplify the wireless signal, especially in WLAN operation. WLAN is one of the most popular ways of establishing a wireless communication network to connect our daily used devices such as mobile phone, laptop, IP camera etc. Path loss, attenuation by materials and the delivered power from the transceiver are the variables to determine the efficiency of this communication network. A passive repeating method has been discussed in this thesis which addresses the mentioned concerns. It is cost effective and in a case of power consumption, does not need any energy outside the system. On the other hand, there are few maintenance costs, if any, for this kind of system. To achieve this, a back-to-back antenna approach has been tested in this study. In a back-to-back system, two antennas are connected by a short waveguide connection to decrease attenuation e.g. a wall. The main challenge concerning the effectiveness of this method was to design and fabricate efficient antennas, which are connected with a coaxial cable. There are multiple frequency bands available for WLAN communication. In this thesis, a frequency of 2.43 GHz is considered. Computer simulation of antennas, fabrication, individual measurement and full passive repeating system measurement has been presented. A prototype of a circular patch antenna is built with a 4.63 dB gain and a return loss of 15.18 dB. The passive repeating system is built by using a commercially available dipole antenna at the other end of the coaxial cable. In various cases, there was an observable improvement of the signal of between 2 dB to 6 dB. Required background and theoretical studies are presented along with the output of the simulated and measured prototype comparison. It is clear from this study that the passive repeating system can be used in some specific indoor areas. Keywords: WLAN, passive repeater, path loss, attenuation, indoor communication