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A Flexible Back-end with Optimum Threshold Estimation for OOK Based Energy Detection IR-UWB Receivers
KTH, School of Information and Communication Technology (ICT), Centres, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK. KTH, School of Information and Communication Technology (ICT), Electronic Systems.
KTH, School of Information and Communication Technology (ICT), Centres, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK. KTH, School of Information and Communication Technology (ICT), Electronic Systems.
KTH, School of Information and Communication Technology (ICT), Centres, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK. KTH, School of Information and Communication Technology (ICT), Electronic Systems.
KTH, School of Information and Communication Technology (ICT), Centres, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK. KTH, School of Information and Communication Technology (ICT), Electronic Systems.
2011 (English)In: 2011 IEEE International Conference on Ultra-Wideband (ICUWB), 2011, 130-134 p.Conference paper, Published paper (Other academic)
Abstract [en]

Impulse Radio Ultra-Wideband (IR-UWB) exhibits strong advantages in low power and low cost applications such as RFID and Wireless Sensor Networks. This paper presents an on-off keying (OOK) based energy detection IR-UWB receiver with focus on the back-end design. In order to optimize the receiver performance according to different multi-path environment, variable integration interval and adaptive threshold optimization are considered in the proposed back-end which is composed by a programmable timing circuit and a reconfigurable baseband processor. The timing circuit is able to generate multi-phased integration windows with wide-range variable integration interval and is implemented in 90 nm CMOS process. Novel schemes on synchronization and optimum threshold estimation are suggested for baseband processing. The proposed synchronization scheme is based on maximum energy variance (between symbol `0' and `1') detection, covering both the pulse level and symbol level synchronization. And the scheme for optimum threshold estimation is based on look up table, enabling low complexity implementation. System simulation with IEEE 802.15.4a channel models shows an appreciable improvement on the bit error rate (BER) performance compared with the conventional scheme.

Place, publisher, year, edition, pages
2011. 130-134 p.
Keyword [en]
Ultra-wideband (UWB), energy detection, on-off keying (OOK), threshold, synchronization
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-53128DOI: 10.1109/ICUWB.2011.6058811ISI: 000302462400029Scopus ID: 2-s2.0-82455221081ISBN: 978-1-4577-1762-8 (print)ISBN: 978-1-4577-1763-5 (print)OAI: oai:DiVA.org:kth-53128DiVA: diva2:469002
Conference
2011 IEEE International Conference on Ultra-Wideband (ICUWB). Bologna. 14 September 2011 - 16 September 2011
Note

QC 20111222

Available from: 2011-12-22 Created: 2011-12-22 Last updated: 2016-11-11Bibliographically approved
In thesis
1. Sub-Nyquist Sampling Impulse Radio UWB Receivers for the Internet-of-Things
Open this publication in new window or tab >>Sub-Nyquist Sampling Impulse Radio UWB Receivers for the Internet-of-Things
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In the era of Internet-of-Things, the demand for short range wireless links featured by low-power and low-cost, robust communication and high-precision positioning is growing rapidly. Impulse Radio Ultra-Wideband (IR-UWB) technology characterized by the transmission of sub-nanosecond pulses spanning up to several GHz band with extremely low power spectral density emerges as a promising candidate. Nevertheless, several challenges must be confronted in order to take the full advantage of IR-UWB technology. The most significant one lies in the reception of UWB signals. Traditional receiver requires Nyquist rate ADC which is overwhelmingly complex and power hungry. This dissertation proposes and investigates possible sub-Nyquist sampling techniques for IR-UWB receiver design.

In the first part of this dissertation, the IR-UWB receiver based on energy detection (ED) principle is explored. A low-power ED receiver featured by flexibility and multi-mode operation is proposed. The receiver prototype for 3-5 GHz band is implemented in 90 nm CMOS. Measurement results demonstrate that 16.3 mW power consumption and -79 dBm sensitivity at 10 Mb/s data rate can be achieved. To further optimize the receiver performance, threshold optimization is suggested for the on-off-keying modulated signal, and adaptive synchronization and integration region optimization is proposed. Finally, a low complexity burst packet detection scheme is proposed, which is adaptive to the variations of noise background and link distance.

In the second part of this dissertation, the IR-UWB receiver based on compressed sensing (CS) theory is investigated. Firstly, appropriate sparse basis, sensing matrix and reconstruction algorithms are suggested for the CS based IR-UWB receiver. And then, the architectural analysis of the CS receiver with focuses on the random noise processes in the CS measurement procedure is presented. At last, a novel two-path noise-reducing architecture for the CS receiver is proposed. Besides the improvement on the receiver performance, the proposed architecture also relaxes the hardware implementation of the CS random projection as well as the back-end signal reconstruction.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2016. 79 p.
Series
TRITA-ICT, 2016:23
Keyword
Ultra-Wideband, impulse radio, receiver, energy detection, compressed sensing, sub-Nyquist sampling, Internet-of-Things
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Information and Communication Technology
Identifiers
urn:nbn:se:kth:diva-195816 (URN)978-91-7729-174-9 (ISBN)
Public defence
2016-12-12, Sal 205, Electrum, Kista, 09:00 (English)
Opponent
Supervisors
Note

QC 20161110

Available from: 2016-11-10 Created: 2016-11-09 Last updated: 2016-11-10Bibliographically approved

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