A Low Complexity Scheme for Passive UWB-RFID: Proof of Concept

Guidi, Francesco; Decarli, Nicolò; Dardari, Davide; Natali, Federico; Savioli, Enrico; Bottazzi, M.

doi:10.1109/lcomm.2016.2530658

Cited by 14 publications

(9 citation statements)

References 6 publications

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“…As a low-power alternative to active UWB transmission in tags, a UWB backscattering scheme can also be adopted [6], with the requirement of synchronizing tags and reference nodes. In this case, readers transmit the UWB signal, and TOA is measured on the backscattered signal.…”

Section: Localization Principlementioning

confidence: 99%

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Micropower Design of an Energy Autonomous RF Tag for UWB Localization Applications

Fabbri

Pizzotti

Romani

2018

2018 IEEE International Symposium on Circuits and Systems (ISCAS)

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This paper describes the architecture and the micropower design criteria of a battery-less, energy autonomous, individually addressable RF tag for UWB localization applications, with a focus on baseband circuitry. The tag includes a UHF rectifier, power conversion and management circuits, an addressable wake-up radio module, a microcontroller-based control unit, and circuits for UWB localization. The proposed circuit is suitable for UWB localization either by using passive backscattering of received UWB pulses, or by using active UWB pulses generators. Power for operation is scavenged from a modulated UHF carrier also used for addressing purposes. The circuit is implemented on discrete components in a 3.12 cm 2 PCB area. The circuit can wake-up from fully discharged states and operates at distances as high as 10.8 m from a 2W-ERP source in the UHF 865-868 MHz RFID band with a +1.8 dBi receiving antenna. The quiescent power consumption of the tag is 3.88 µW, and the average power consumption at an addressing and activation rate of one time per second is 4.7 µW. The effectiveness of UWB localization was tested in a localization system based on time-difference-of-arrival (TDOA) estimations, consisting of multiple UWB readers and UHF transmitters.

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Section: Localization Principlementioning

confidence: 99%

“…2. The tag is compatible with UWB localization either (i) in a backscattering configuration [6] or (ii) with an active pulses generator [7]. The design is highly modular, so that individual modules are easily replaceable with more efficient parts as they become available.…”

Section: Tag Architecturementioning

confidence: 99%

Micropower Design of an Energy Autonomous RF Tag for UWB Localization Applications

Fabbri

Pizzotti

Romani

2018

2018 IEEE International Symposium on Circuits and Systems (ISCAS)

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“…UWB backscattering has significantly looser power requirements than active RF transmission. A comprehensive theoretical description of the adopted architecture, protocols and signals for communication and localization is reported in [8]- [10]. To summarize, the reference nodes sample and process in a coordinated fashion backscattered UWB signals, extract the data transmitted by tags by means of their orthogonal codes, and compute the current tag position by means of time-ofarrival or time difference-of-arrival measurements.…”

Section: Ic Architecturementioning

confidence: 99%

“…The source inductor L S adjusts to 180° the phase difference between the two modulator states. L S consists of a 1.5 turns spiral with a diameter of 126 µm and was designed by following the procedure reported in [10]. The simulated energy required by the backscattering modulator is around 0.96 pJ per bit in the low-to-high transition and about 0.25 pJ per bit in the high-to-low transition.…”

Section: Cmentioning

confidence: 99%

A CMOS RF-Powered Tag with Sensing and Localization Capabilities

Tamburini

Pizzotti

Dini

et al. 2018

2018 IEEE 23rd International Workshop on Computer Aided Modeling and Design of Communication Links and Networks (CAMAD)

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This paper presents a battery-less CMOS integrated RF tag with sensing and localization capabilities. In order to allow tag addressing, communication, and localization by external readers, the IC performs a back-scattering modulation of a sequence of received UWB pulses according to specific spreading codes. For this purpose a UWB RF switch is designed and connected to the UWB antenna. The adoption of backscattering is integral to achieve ultra-low power wireless communication. The use of quasi-orthogonal spreading codes allows communication and localization with multiple tags at the same time. The IC includes a low-power sensing interface suitable for internal temperature sensing or external capacitive sensors. The power required for operation is scavenged from an UHF signal and converted by means of an internal RF rectifier and of a dynamically reconfigurable charge pump circuit. An onchip micropower oscillator clocks a digital control circuit. The circuit is implemented in a 0.18 µm CMOS process. The architecture of the IC and preliminary test results are disclosed.

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“…Arnitz et al provided a proof for a UWB-based passive UHF RFID [ 14 ] ranging concept, which was very robust to multipath propagation. Guidi et al also proposed a specific assignment strategy [ 15 ] to simplify the acquisition of the tag code at the reader side, which verified the feasibility of the excellent real-time multi-tag positioning. Li et al analyzed the different multi-path interferences of a needle under the storage scenario and analyzed the frequency bands suitable for different environments and accuracy requirements [ 16 ].…”

Section: Introductionmentioning

confidence: 96%

An RFID Indoor Positioning Algorithm Based on Support Vector Regression

et al. 2018

Sensors

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Nowadays, location-based services, which include services to identify the location of a person or an object, have many uses in social life. Though traditional GPS positioning can provide high quality positioning services in outdoor environments, due to the shielding of buildings and the interference of indoor environments, researchers and enterprises have paid more attention to how to perform high precision indoor positioning. There are many indoor positioning technologies, such as WiFi, Bluetooth, UWB and RFID. RFID positioning technology is favored by researchers because of its lower cost and higher accuracy. One of the methods that is applied to indoor positioning is the LANDMARC algorithm, which uses RFID tags and readers to implement an Indoor Positioning System (IPS). However, the accuracy of the LANDMARC positioning algorithm relies on the density of reference tags and the performance of RFID readers. In this paper, we introduce the weighted path length and support vector regression algorithm to improve the positioning precision of LANDMARC. The results show that the proposed algorithm is effective.

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A Low Complexity Scheme for Passive UWB-RFID: Proof of Concept

Cited by 14 publications

References 6 publications

Micropower Design of an Energy Autonomous RF Tag for UWB Localization Applications

Micropower Design of an Energy Autonomous RF Tag for UWB Localization Applications

A CMOS RF-Powered Tag with Sensing and Localization Capabilities

An RFID Indoor Positioning Algorithm Based on Support Vector Regression

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