this paper presents how carrier frequency differences among transmitters affect concurrent transmission in wireless sensor networks. the carrier frequency differences cause two problems: reverse phase rotation and sig...
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ISBN:
(纸本)9781450320276
this paper presents how carrier frequency differences among transmitters affect concurrent transmission in wireless sensor networks. the carrier frequency differences cause two problems: reverse phase rotation and signal level fluctuations. the effects of these problems depend on modulation schemes. the demonstration shows these problems with moving images of superposed baseband signal and constellation transmitted from 1-6 nodes concurrently.
In wireless sensor networks (WSNs), random failures at the sensor nodes and the communication level reduce the likelihood of completing a prescribed mission. this likelihood is further reduced when geographically corr...
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ISBN:
(纸本)9781450320276
In wireless sensor networks (WSNs), random failures at the sensor nodes and the communication level reduce the likelihood of completing a prescribed mission. this likelihood is further reduced when geographically correlated failures affect the sensing and communication capabilities of the network. In this work, a mission allocation algorithm for WSNs accounting for geographically correlated failures is proposed. the algorithm maximizes the likelihood of completing a mission in WSNs by allocating resources onto the sensor nodes according to a score that weighs the resources, the availability, and the likelihood of sensor nodes to be affected by geographically correlated failures.
We study what happens when the same wireless sensor net- work (WSN) is \immersed" in diferent outdoor environ- ments, namely, two types of forests and an open field. Quali- tative answers can be derived from exis...
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ISBN:
(纸本)9781450320276
We study what happens when the same wireless sensor net- work (WSN) is \immersed" in diferent outdoor environ- ments, namely, two types of forests and an open field. Quali- tative answers can be derived from existing results. Here, we aim to quantify the extent of changes, both at the physical and application layer, based on the combined efect of environmental parameters over daily and seasonal time-scales.
We present Twonet, a large-scale sensor network testbed with dual-radio nodes. Twonet has 100 Opal nodes with lowpower 32-bit ARM CPU and 2.4 GHz and 900 MHz radios. these nodes are managed by a network of 20 Raspberr...
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ISBN:
(纸本)9781450320276
We present Twonet, a large-scale sensor network testbed with dual-radio nodes. Twonet has 100 Opal nodes with lowpower 32-bit ARM CPU and 2.4 GHz and 900 MHz radios. these nodes are managed by a network of 20 Raspberry Pi nodes at tier 2 and a PC server at tier 1. these nodes together provide a robust testbed for public access. Twonet represents a major addition to the collection of wireless sensor network testbeds that are publicly available. We hope Twonet's availability will foster sensor network research based on a modern 32-bit sensor node architecture and multi-channel wireless networking.
Novel protocols that can enable ultra-low latency communication in wireless multihop sensor and actuator networks have recently been presented in the literature. these approaches achieve ultra-low latencies in packet ...
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ISBN:
(纸本)9781450320276
Novel protocols that can enable ultra-low latency communication in wireless multihop sensor and actuator networks have recently been presented in the literature. these approaches achieve ultra-low latencies in packet delivery notwithstanding the unreliability of the wireless channel. A systematic methodology to analyze and compare the perfor- mance of ultra-low latency communication protocols is however still missing. this work presents our first steps towards the definition of such a methodology. Building upon this work, we aim at designing and implementing a comprehensive benchmarking framework for ultra-low latency communication protocols.
the system is environment monitoring service based on Wireless sensor Networks (WSN). Users can know temperature, humidity, light, and CO2 level in real time. Excessive electricity consumption by lighting in the ofice...
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ISBN:
(纸本)9781450320276
the system is environment monitoring service based on Wireless sensor Networks (WSN). Users can know temperature, humidity, light, and CO2 level in real time. Excessive electricity consumption by lighting in the ofice can be saved and the quality of the ofice environment can become better by controlling lighting and CO2 level.
Location information about mobile devices can reveal movement patterns of people wearing them. We present a crosstechnology approach to track Wi-Fi enabled smartphones using a ZigBee sensor network. Implementing such ...
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ISBN:
(纸本)9781450320276
Location information about mobile devices can reveal movement patterns of people wearing them. We present a crosstechnology approach to track Wi-Fi enabled smartphones using a ZigBee sensor network. Implementing such a system on resource constrained low-power sensor nodes requires means to eficiently process signal strength measurements. We propose a new method to recognize Wi-Fi probe requests on devices that are unable to decode Wi-Fi packets. Initial experiments on a testbed show that it is possible to localize unmodified phones within a building using signal strength measurements.
ProvinciaSense is a proof-of-concept of the integration of both static and mobile sensor nodes with ProvinciaWiFi, a network which currently hosts more than 1100 WiFi Access Points (APs) serving Rome and other 120 cit...
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ISBN:
(纸本)9781450320276
ProvinciaSense is a proof-of-concept of the integration of both static and mobile sensor nodes with ProvinciaWiFi, a network which currently hosts more than 1100 WiFi Access Points (APs) serving Rome and other 120 cities with about 4.5 millions of citizens. the simple and cost efective integration of sensor nodes with a big number of ProvinciaWiFi APs will allow us to deploy one among the biggest available testbeds for wireless sensor networks and to support the implementation of efective smart cities services.
the purpose of this demo is to introduce a new low-power wireless device for Wireless sensor Networks (WSN) operating in the ISM 2.4Ghz band: the MagoNode. thanks to a highly eficient RF front-end, that extends the ra...
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ISBN:
(纸本)9781450320276
the purpose of this demo is to introduce a new low-power wireless device for Wireless sensor Networks (WSN) operating in the ISM 2.4Ghz band: the MagoNode. thanks to a highly eficient RF front-end, that extends the radio range and increases link reliability, the MagoNode features outstanding RF performance, still containing energy consumption. the platform has been designed at the Department of Computer, Control, and Management Engineering Antonio Ruberti of the University of Rome La Sapienza in collaboration withthe spin-of WSense [1].
Real-world experiments have shown that the transmission power and the received signal strength of low-power radio transceivers used in sensornets decrease when temperature increases. We analyze how this phenomenon afe...
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ISBN:
(纸本)9781450320276
Real-world experiments have shown that the transmission power and the received signal strength of low-power radio transceivers used in sensornets decrease when temperature increases. We analyze how this phenomenon afects the network layer, and find that temperature uctuations may cause undesirable behavior by sensornet routing protocols such as CTP and RPL. Furthermore, we present an approach to make these protocols robust to temperature uctuations by augmenting the ETX link metric with temperature hints.
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