The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
David Wetherall - One of the best experts on this subject based on the ideXlab platform.
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Wi-Fi Backscatter: Internet Connectivity for RF-Powered Devices
Proceedings of the 2014 ACM conference on SIGCOMM - SIGCOMM '14, 2014Co-Authors: Bryce Kellogg, Aaron Parks, Joshua R Smith, Shyamnath Gollakota, David WetherallAbstract:RF-powered computers are small devices that com- pute and communicate using only the power that they harvest from RF signals.While existing technologies have harvested power from ambient RF sources (e.g., TV broadcasts), they require a dedicated gateway (like an RFID reader) for Internet Connectivity. We present Wi-Fi Backscatter, a novel communication system that bridges RF-powered devices with the Internet. Specifically, we show that it is possible to reuse existing Wi-Fi infrastructure to provide Internet Connectivity to RF-powered devices. To show Wi-Fi Backscatter’s feasibility, we build a hardware prototype and demonstrate the first communication link between an RF-powered device and commodity Wi-Fi devices. We use off-the-shelf Wi-Fi devices including Intel Wi-Fi cards, Linksys Routers, and our or- ganization’sWi-Fi infrastructure, and achieve communication rates of up to 1 kbps and ranges of up to 2.1 meters. We believe that this new capability can pave the way for the rapid deployment and adoption of RF-powered devices and achieve ubiquitous connectiv- ity via nearby mobile devices that areWi-Fi enabled.
S Banerjee - One of the best experts on this subject based on the ideXlab platform.
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enhancing vehicular Internet Connectivity using whitespaces heterogeneity and a scouting radio
International Conference on Mobile Systems Applications and Services, 2014Co-Authors: Tan Zhang, Sayandeep Sen, S BanerjeeAbstract:We explore the use of TV whitespace communication systems for providing robust Connectivity to vehicles. A key challenge in this setup is the asymmetry in transmit power limits -- the fixed base station is allowed to communicate at up to 4 W, while the mobile gateways in vehicles are limited to 100 mW. This paper presents a specific solution to deal with this asymmetry in which whitespace transceivers are used in the downlink direction while a more traditional cellular path is used in the uplink one. While heterogeneous communication systems have been considered before (e.g., in some satellite networks), our solution explores some unique opportunities that arise in vehicular systems. In particular, we describe a system called Scout that uses a front radio at the head of a vehicle to look ahead and identify the best channel parameters to be used when the rear radio eventually reaches the forward post. We use these channel estimates to adapt a number of transmission mechanisms for improving the performance of flows through this heterogeneous network. We have implemented and deployed this system on moving vehicles in an urban environment, and demonstrated 3 -- 8× performance improvement over simpler alternatives that do not use the scouting technique.
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policy based network management for generalized vehicle to Internet Connectivity
ACM Special Interest Group on Data Communication, 2012Co-Authors: Joshua Hare, Lance Hartung, S BanerjeeAbstract:Spectrum is the scarce and limiting resource for all wide-area wireless communication activities. As user loads on this limited resource continue to grow rapidly, it is necessary for "providers" to have effective tools, frameworks, and functionalities to manage allocation of this resource to users. In this paper, we introduce a policy framework, called Virtuoso, that manages heterogeneous spectrum resources for large collections of users aggregated over multiple operators. The goal of Virtuoso is to enable providers to flexibly manage their spectrum resources while ensuring that users have suitable access for their communication needs. Instead of describing the problem in the abstract form, we draw all requirements of this system from our multi-year effort of designing, implementing, deploying, and operating an Internet service for multiple public transit systems that operate in the state of Wisconsin, USA, and in some neighboring states of the upper Midwest. In Virtuoso we propose a simple syntax through which users and administrators can express their network control preferences. We believe that centralized control of network resources, as defined in Virtuoso, will simplify the management of Connectivity for large mobile populations, of which vehicular fleets are just one example.
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policy based network management for generalized vehicle to Internet Connectivity
International Workshop on VehiculAr Inter-NETworking, 2012Co-Authors: Joshua Hare, Lance Hartung, S BanerjeeAbstract:Over the past year and a half we have operated a vehicle-to-Internet solution that provides WiFi Connectivity to passenger buses. While operating this service we have found it difficult to centrally manage network resources despite multiple low level tools being available. For this reason we propose the WiRover Policy Framework which provides a unified, centralized solution to manage and control network resources. Further, we propose a simple syntax with which users and administrators can express their network control preferences. We believe that centralized control of network resources will simplify the management of vehicle-to-Internet Connectivity and will enable new forms of Connectivity models to develop.
Bryce Kellogg - One of the best experts on this subject based on the ideXlab platform.
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inter technology backscatter towards Internet Connectivity for implanted devices
GetMobile: Mobile Computing and Communications, 2017Co-Authors: Vikram Iyer, Bryce Kellogg, Vamsi Talla, Joshua R Smith, Shyamnath GollakotaAbstract:We introduce inter-technology backscatter, a novel approach that transforms wireless transmissions from one technology to another, on the air. We show for the first time that Bluetooth transmissions can be used to create Wi-Fi and ZigBee-compatible signals using backscatter communication. Since Bluetooth, Wi-Fi and ZigBee radios are widely available, this enables a backscatter design that works using only commodity devices. We build an FPGA prototype that creates 2'11 Mbps Wi-Fi or Zigbee packets by backscattering Bluetooth transmissions. We use this to demonstrate previously infeasible applications including the first contact lens form-factor antenna prototype and implantable neural recording interface that communicate directly to commodity devices, such as smartphones, thus enabling the vision of Internet-connected implanted devices
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inter technology backscatter towards Internet Connectivity for implanted devices
arXiv: Networking and Internet Architecture, 2016Co-Authors: Vikram Iyer, Bryce Kellogg, Vamsi Talla, Shyamnath Gollakota, Joshua R SmithAbstract:We introduce inter-technology backscatter, a novel approach that transforms wireless transmissions from one technology to another, on the air. Specifically, we show for the first time that Bluetooth transmissions can be used to create Wi-Fi and ZigBee-compatible signals using backscatter communication. Since Bluetooth, Wi-Fi and ZigBee radios are widely available, this approach enables a backscatter design that works using only commodity devices. We build prototype backscatter hardware using an FPGA and experiment with various Wi-Fi, Bluetooth and ZigBee devices. Our experiments show we can create 2-11 Mbps Wi-Fi standards-compliant signals by backscattering Bluetooth transmissions. To show the generality of our approach, we also demonstrate generation of standards-complaint ZigBee signals by backscattering Bluetooth transmissions. Finally, we build proof-of-concepts for previously infeasible applications including the first contact lens form-factor antenna prototype and an implantable neural recording interface that communicate directly with commodity devices such as smartphones and watches, thus enabling the vision of Internet connected implanted devices.
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Wi-Fi Backscatter: Internet Connectivity for RF-Powered Devices
Proceedings of the 2014 ACM conference on SIGCOMM - SIGCOMM '14, 2014Co-Authors: Bryce Kellogg, Aaron Parks, Joshua R Smith, Shyamnath Gollakota, David WetherallAbstract:RF-powered computers are small devices that com- pute and communicate using only the power that they harvest from RF signals.While existing technologies have harvested power from ambient RF sources (e.g., TV broadcasts), they require a dedicated gateway (like an RFID reader) for Internet Connectivity. We present Wi-Fi Backscatter, a novel communication system that bridges RF-powered devices with the Internet. Specifically, we show that it is possible to reuse existing Wi-Fi infrastructure to provide Internet Connectivity to RF-powered devices. To show Wi-Fi Backscatter’s feasibility, we build a hardware prototype and demonstrate the first communication link between an RF-powered device and commodity Wi-Fi devices. We use off-the-shelf Wi-Fi devices including Intel Wi-Fi cards, Linksys Routers, and our or- ganization’sWi-Fi infrastructure, and achieve communication rates of up to 1 kbps and ranges of up to 2.1 meters. We believe that this new capability can pave the way for the rapid deployment and adoption of RF-powered devices and achieve ubiquitous connectiv- ity via nearby mobile devices that areWi-Fi enabled.
Keith N Hampton - One of the best experts on this subject based on the ideXlab platform.
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overcoming michigan s homework gap the role of broadband Internet Connectivity for student success and career outlooks
Social Science Research Network, 2020Co-Authors: Johannes M Bauer, Keith N Hampton, Laleah Fernandez, Craig T RobertsonAbstract:Differences in home Internet access have direct and indirect effects on K-12 student educational achievements. Much of the attention during the past years has been on the homework gap, disadvantages to students of lacking or poor Internet Connectivity at home for the completion of homework assignments. Our research, based on a detailed survey of 3,258 students in grades 8-11 in small town and rural Michigan school districts, shows that the homework gap is real even after controlling for socioeconomic and other factors. It also shows that disparities in home Internet Connectivity are associated, directly and indirectly, with much broader student performance gaps. They are associated with the development of digital skills, grades, standardized test scores, career orientation, and interest in pursuing post-secondary education. These challenges require a portfolio of responses, including coordinated efforts by local, state and federal policymakers to mitigate broadband infrastructure access and affordability gaps. They also require measures to make appropriate access devices available and the facilitation of skills and practices to take advantage of the opportunities offered by digitally supported teaching and learning.
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the social life of wireless urban spaces Internet use social networks and the public realm
Journal of Communication, 2010Co-Authors: Keith N Hampton, Oren Livio, Lauren Sessions GouletAbstract:This study explores the role of urban public spaces for democratic and social engagement. It examines the impact of wireless Internet use on urban public spaces, Internet users, and others who inhabit these spaces. Through observations of 7 parks, plazas, and markets in 4 North American cities, and surveys of wireless Internet users in those sites, we explore how this new technology is related to processes of social interaction, privatism, and democratic engagement. Findings reveal that Internet use within public spaces affords interactions with existing acquaintances that are more diverse than those associated with mobile phone use. However, the level of colocated social diversity to which Internet users are exposed is less than that of most users of these spaces. Yet, online activities in public spaces do contribute to broader participation in the public sphere. Internet Connectivity within public spaces may contribute to higher overall levels of democratic and social engagement than what is afforded by exposure within similar spaces free of Internet Connectivity.
Aaron Parks - One of the best experts on this subject based on the ideXlab platform.
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Wi-Fi Backscatter: Internet Connectivity for RF-Powered Devices
Proceedings of the 2014 ACM conference on SIGCOMM - SIGCOMM '14, 2014Co-Authors: Bryce Kellogg, Aaron Parks, Joshua R Smith, Shyamnath Gollakota, David WetherallAbstract:RF-powered computers are small devices that com- pute and communicate using only the power that they harvest from RF signals.While existing technologies have harvested power from ambient RF sources (e.g., TV broadcasts), they require a dedicated gateway (like an RFID reader) for Internet Connectivity. We present Wi-Fi Backscatter, a novel communication system that bridges RF-powered devices with the Internet. Specifically, we show that it is possible to reuse existing Wi-Fi infrastructure to provide Internet Connectivity to RF-powered devices. To show Wi-Fi Backscatter’s feasibility, we build a hardware prototype and demonstrate the first communication link between an RF-powered device and commodity Wi-Fi devices. We use off-the-shelf Wi-Fi devices including Intel Wi-Fi cards, Linksys Routers, and our or- ganization’sWi-Fi infrastructure, and achieve communication rates of up to 1 kbps and ranges of up to 2.1 meters. We believe that this new capability can pave the way for the rapid deployment and adoption of RF-powered devices and achieve ubiquitous connectiv- ity via nearby mobile devices that areWi-Fi enabled.