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Baseband design for passive semi-UWB wireless sensor and identification systems
KTH, School of Information and Communication Technology (ICT), Electronic, Computer and Software Systems, ECS.
KTH, School of Information and Communication Technology (ICT), Electronic, Computer and Software Systems, ECS.
KTH, School of Information and Communication Technology (ICT), Electronic, Computer and Software Systems, ECS.
KTH, School of Information and Communication Technology (ICT), Electronic, Computer and Software Systems, ECS.
2007 (English)In: Proceedings - 20th Anniversary IEEE International SOC Conference / [ed] Sezer, S; Chen, SJ; Marshall, A; Tran, T, 2007, 313-316 p.Conference paper, Published paper (Refereed)
Abstract [en]

This paper presents a digital baseband design for passive sensor and identification systems using asymmetric wireless links with ultra wideband (UWB) radio. As opposed to traditional wireless sensor and identification systems using halfduplex communication in narrowband frequency, impulse-LTWB is applied as an uplink in the proposed system. A novel baseband protocol is devised to improve the system efficiency in the multitag environment while maintaining the power constraint. By utilizing adaptive slotted ALOHA anti-collision algorithm, 1000 tags can be processed within 5OOms. The contributions also include the development of a low-power digital baseband processor for passive tags. The simulation is successful and the FPGA prototype is operational. The chip is implemented for ASIC and it Kill be fabricated and tested Kith the front-end in IP6M UMC 0. 18 mu m process.

Place, publisher, year, edition, pages
2007. 313-316 p.
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-40704ISI: 000257572200070Scopus ID: 2-s2.0-51049085059ISBN: 978-1-4244-1592-2 (print)OAI: oai:DiVA.org:kth-40704DiVA: diva2:442659
Conference
20th IEEE International SOC Conference Location: Hsinchu, Taiwan, Date: SEP 26-29, 2007
Available from: 2011-09-22 Created: 2011-09-20 Last updated: 2012-01-10Bibliographically approved
In thesis
1. Impulse Radio UWB for the Internet-of-Things: A Study on UHF/UWB Hybrid Solution
Open this publication in new window or tab >>Impulse Radio UWB for the Internet-of-Things: A Study on UHF/UWB Hybrid Solution
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This dissertation investigates Ultra-Wideband (UWB) techniques for the next generation Radio Frequency Identification (RFID) towards the Internet-of-Things (IoT). In particular, an ultra-high frequency (UHF) wireless-powered UWB radio (UHF/UWB hybrid) with asymmetric links is explored from system architecture to circuit implementation.

Context-aware, location-aware, and energy-aware computing for the IoT demands future micro-devices (e.g., RFID tags) with capabilities of sensing, processing, communication, and positioning, which can be integrated into everyday objects including paper documents, as well as food and pharmaceutical packages. To this end, reliable-operating and maintenance-free wireless networks with low-power and low-cost radio transceivers are essential. In this context, state-of-the-art passive RFID technologies provide limited data rate and positioning accuracy, whereas active radios suffer from high complexity and power-hungry transceivers. Impulse Radio UWB (IR-UWB) exhibits significant advantages that are expected to overcome these limitations. Wideband signals offer robust communications and high-precision positioning; duty-cycled operations allow link scalability; and baseband-like architecture facilitates extremely simple and low-power transmitters. However, the implementation of the IR-UWB receiver is still power-hungry and complex, and thus is unacceptable for self-powered or passive tags.

To cope with μW level power budget in wireless-powered systems, this dissertation proposes an UHF/UWB hybrid radio architecture with asymmetric links. It combines the passive UHF RFID and the IR-UWB transmitter. In the downlink (reader-tag), the tag is powered and controlled by UHF signals as conventional passive UHF tags, whereas it uses an IR-UWB transmitter to send data for a short time at a high rate in the uplink (tag-reader). Such an innovative architecture takes advantage of UWB transmissions, while the tag avoids the complex UWB receiver by shifting the burden to the reader. A wireless-powered tag providing -18.5 dBm sensitivity UHF downlink and 10 Mb/s UWB uplink is implemented in 180 nm CMOS. At the reader side, a non-coherent energy detection IR-UWB receiver is designed to pair the tag. The receiver is featured by high energy-efficiency and flexibility that supports multi-mode operations. A novel synchronization scheme based on the energy offset is suggested. It allows fast synchronization between the reader and tags, without increasing the hardware complexity. Time-of-Arrival (TOA) estimation schemes are analyzed and developed for the reader, which enables tag localization. The receiver prototype is fabricated in 90 nm CMOS with 16.3 mW power consumption and -79 dBm sensitivity at 10 Mb/s data rate. The system concept is verified by the link measurement between the tag and the reader. Compared with current passive UHF RFID systems, the UHF/UWB hybrid solution provides an order of magnitude improvement in terms of the data rate and positioning accuracy brought by the IR-UWB uplink.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2011. xx, 94 p.
Series
Trita-ICT-ECS AVH, ISSN 1653-6363 ; 11:15
Keyword
Ultra-Wideband, impulse radio, IR-UWB, RFID, asymmetric links, UHF/UWB hybrid, wireless sensing, energy detection, low power, radio receiver, positioning, Internet-of-Things
National Category
Computer Systems Communication Systems
Identifiers
urn:nbn:se:kth:diva-59107 (URN)978-91-7501-206-3 (ISBN)
Public defence
2012-02-08, Sal/Hall D, KTH-Forum, Isafjordsgatan 39, Kista, 13:30 (English)
Opponent
Supervisors
Note
QC 20120110Available from: 2012-01-10 Created: 2012-01-10 Last updated: 2012-01-11Bibliographically approved

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