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Wireless Sensors and Sensor Networks (WiSNet), 2013 IEEE Topical Conference on

Date 20-23 Jan. 2013

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  • [Front and back cover]

    Page(s): c1 - c4
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  • [USB/CD welcome]

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  • [CD label]

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  • [CD booklet]

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  • Hub page

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  • Session list

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  • WiSNet 2013 table of contents

    Page(s): 1 - 8
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  • WiSNet 2013 brief author index

    Page(s): 1 - 5
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  • WiSNet 2013 detailed author index

    Page(s): 1 - 33
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  • The end of indexes [breaker page]

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  • [PDF Reader FAQ and support]

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  • Frequently asked questions

    Page(s): 1 - 5
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  • Final program

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  • Hybrid analog-digital backscatter platform for high data rate, battery-free sensing

    Page(s): 1 - 3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (472 KB) |  | HTML iconHTML  

    This paper presents a hybrid analog-digital backscatter platform for high data rate battery free wireless sensing. A digital RFID platform (WISP) has been integrated with an analog sensor (microphone) to develop a digitally addressable RFID tag which uses analog backscatter for high data rate transmission of sensor data (audio). The hybrid WISP operates in two modes: digital mode (default mode) to transmit and receive digital data (as per EPC Gen 2 RFID protocol) and analog mode (activated by Gen 2 READ command) to backscatter audio sensor data. We report an operating range of more than 4 meters for the digitally addressable, battery free wireless audio sensor. View full abstract»

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  • Coherence multiplexed passive wireless SAW RFID tag system

    Page(s): 4 - 6
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (580 KB) |  | HTML iconHTML  

    This paper discusses a novel coherence multiplexed system for passive surface acoustic wave (SAW) RF-identification (RFID) tags. The method is adapted from optical coherence-domain reflectometry (OCDR) which is widely used today in optical coherence tomography (OCT) for medical applications. The paper discusses the coherence multiplexing technique as applied to SAW RFID. A broadband white Gaussian noise source is used as the interrogation signal and one of the major advantages is the large signal dynamic range obtained. A prototype transceiver system was built at 915MHz and used for wireless interrogation of SAW tags. The signal processing technique is discussed and the results of wireless multiplexing of four RFID SAW tags are shown. View full abstract»

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  • A UWB transmit-only based scheme for multi-tag support in a millimeter accuracy localization system

    Page(s): 7 - 9
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (281 KB) |  | HTML iconHTML  

    Ultra Wideband (UWB) wireless positioning systems have many advantages for tracking and locating items in indoor environments. Surgical navigation and industrial process control are potential applications for high accuracy UWB localization systems with millimeter accuracy. Several experimental systems have achieved very high accuracy, but have generally neglected significant system features like multi-tag access. This paper outlines a UWB localization system, which addresses both multi-tag performance and localization accuracy using UWB transmit-only digital communication and time difference of arrival (TDOA). The scheme takes advantage of a digital sampling circuit that can be used for both sub-sampling and data reception. Preliminary 1-D experimental results using this system resulted in a total system update rate of 889 Hz and localization accuracy of 3.25mm. View full abstract»

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  • High-Q adaptive matching network for remote powering of UHF RFIDs and wireless sensor systems

    Page(s): 10 - 12
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (109 KB) |  | HTML iconHTML  

    Process and temperature independent RF frontend design is important for remotely powered RFID tags and wireless sensor systems. Run-to-run process variations can impact the remote powering performance and therefore read range of aforementioned systems. We introduce analysis and propose a design methodology for high-Q switched capacitor matching network for remote powering. The method is demonstrated with a differential drive rectifier topology with -14 dBm of input power at 900 MHz UHF band. Simulation results show the improvement on delivered power up to 42% and extension of the read range of the sensor system up to 19% with utilization of the proposed work. View full abstract»

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  • High speed, high analog bandwidth buck converter using GaN HEMTs for envelope tracking power amplifier applications

    Page(s): 13 - 15
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (177 KB) |  | HTML iconHTML  

    We report a DC/DC converter based on GaN HEMTs with a switching frequency above 200 MHz that can be used to generate envelope-modulated power supply voltages for use in envelope tracking power amplifiers. The converter consists of switching circuits using 0.7-um GaN HEMTs, inductor, and low pass filter, and can provide output voltages above 20V. Generation of envelope power supply voltages for 20 MHz LTE signals was demonstrated using 200 MHz switching rates with efficiency of 64% (including dissipation in final and drivers stages; final stage efficiency was 90%). To the best of our knowledge, this is the first demonstration of high speed dc/dc converters for envelope amplifiers using GaN HEMTs. View full abstract»

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  • A through wall doppler radar system: Active textile antenna design, prototyping and experiment

    Page(s): 16 - 18
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (122 KB) |  | HTML iconHTML  

    Using garments as a platform for electronic sensing and communication systems opens up a wide range of novel and exciting applications. By carefully tailoring the antenna properties and by adopting a dedicated design strategy, a robust wearable antenna system can be obtained onto which all necessary electronics are integrated. In this contribution, the dedicated design for approach of a low-weight, wearable Doppler radar system fabricated on textile materials is presented. The system, fully integrated into a rescue worker's garment, is capable of detecting moving objects behind a barrier. It relies on an array of four textile transmit antennas to scan the surroundings. At the receiving end, an active wearable receive antenna is deployed to capture the reflected signals. It is demonstrated that the on-body system is capable of detecting moving subjects in indoor environments, including through-wall scenarios. View full abstract»

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  • Highly accurate noncontact water level monitoring using continuous-wave Doppler radar

    Page(s): 19 - 21
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (704 KB) |  | HTML iconHTML  

    A novel water level monitoring technique using continuous-wave (CW) Doppler radar is presented. The CW radar works with a DC-coupled baseband that allows accurate monitoring of the slow-varying water level. Ray tracing model has been used to simulate and validate the feasibility of water level monitoring in the presence of ripple. The proposed technique is robust against clutter interference and the fluctuation of water ripples by properly choosing the carrier frequency. Experiment was carried out to monitor the water level in a rain barrel when the water was draining out. Both simulation and experiment shows that the proposed technique can accurately monitor the water level with a high accuracy in millimeter-scale. View full abstract»

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  • The investigation of millimetre wave optical harmonic transponders and radar for monitoring small insects

    Page(s): 22 - 24
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (277 KB) |  | HTML iconHTML  

    The paper investigates the use of millimetre wave optical harmonic transponders for tracking small insects. Their small dimensions (5.15mm × 2.91mm), low profile, and low weight (~10mg) make them suitable for monitoring small insects. It provides 5dB and 3dB improvement in conversion gain under no illumination when illuminated by red laser without and with 0.9OD neutral density filter respectively. Its associated low power harmonic radar can be portable due to the small size of the millimetre wave components. So far, the prototype radar operating in CW mode has detected optical transponders up to a range of 1m. The detection range, and range resolution can be improved by increasing the radar antenna gains and improving the receiver noise floor by introducing a frequency modulation technique and reducing the receiver bandwidth. View full abstract»

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  • High range resolution frequency-hopping sensor system

    Page(s): 25 - 27
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (327 KB) |  | HTML iconHTML  

    Wireless sensor is recently playing an important role in improving the quality of life on our daily indoor space, and especially UWB-IR sensor has attracted considerable attention owing to the high ranging accuracy and multipath resistance. However, it may be difficult to occupy very broad continuous frequency band because of available spectrum shortage. Therefore it is important to consider a new approach in order to coexist with the other radio systems. This paper presents a high range-resolution frequency-hopping (FH) wideband sensor where each transmit narrowband frequency is hopped cross many guard-bands available. The FH sensor provides the high range resolution by embedding the sharp spectrums into the guard-bands in frequency domain. The measurements and simulations were conducted and the performance is investigated. View full abstract»

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  • A stepped-frequency continuous wave ranger for aiding pedestrian navigation

    Page(s): 28 - 30
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (867 KB) |  | HTML iconHTML  

    Pedestrian navigation is readily enabled by GPS in outdoor environments. However, there are many locations - indoors, urban canyons and underground - where the GPS signal is unreliable or unavailable. Compact, MEMS inertial navigation, augmented by a Shoe Ranging Sensor (SRS) that measures scalar range between shoes, greatly reduces navigational error over large distances in simulations. Existing sensors have insufficient measurement dynamic range or environmental resiliency. Here, the authors report on an SRS based on stepped-frequency continuous wave radar with RMS ranging accuracy of 0.59 mm and 1 m range. This is an order-of-magnitude more accuracy over recent ultra-wideband rangers. View full abstract»

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  • Radar measurements with micrometer accuracy and nanometer stability using an ultra-wideband 80 GHz radar system

    Page(s): 31 - 33
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1444 KB) |  | HTML iconHTML  

    In this paper, a high precision 80 GHz radar distance measurement system is presented. It is based on an ultra-wideband SiGe monostatic transceiver chip, which enables a bandwidth of 25.6 GHz around a center frequency of 80 GHz (i.e. 32%). All components besides the silicon radar chip are off-the-shelf electronics, which makes the sensor well-suited for low-cost industrial measurement applications. First, the measurement stability of the system is characterized. An excellent phase noise of -88 dBc/Hz (10 kHz offset from an 80 GHz carrier) was measured. Furthermore the stability of distance measurements inside a waveguide, are presented, which results in a standard deviation of the targets' phase of 0.008 degree, which corresponds to a distance jitter of 41 nm. Finally a measurement setup with a high precision linear motor on a low vibration table is used for distance measurements. A distance error below 4 micrometer was achieved and confirmed by three different measurement runs. View full abstract»

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  • Range-time-frequency representation of a pulse Doppler radar imaging system for indoor localization and classification

    Page(s): 34 - 36
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (645 KB) |  | HTML iconHTML  

    Pulse Doppler radars using UWB technology are becoming very popular for their wide range of capabilities and applications. UWB waveforms are used for imaging in indoor environments, target localization and classification behind walls, and evaluating micro-Doppler signatures. Typically, CW and FMCW radars are used for measuring time Doppler frequency shifts and subsequently providing time-frequency signals. Meanwhile, UWB pulse Doppler radars provide range-time-frequency representation. This representation provides both highly accurate range and micro-Doppler information. This 3D representation (i.e. time, frequency, range) can be effectively used for detailed human gait analysis, tracking more than one object at a time even behind walls as UWB radars allow clutter removal and wall mitigation. This paper is an overview of such activities. View full abstract»

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