Change search
Link to record
Permanent link

Direct link
BETA
Alternative names
Publications (10 of 29) Show all publications
Pasku, V., De Angelis, A., Moschitta, A., Carbone, P., Nilsson, J.-O., Dwivedi, S. & Händel, P. (2017). A Magnetic Ranging-Aided Dead-Reckoning Positioning System for Pedestrian Applications. Paper presented at IEEE International Instrumentation and Measurement Technology Conference (I2MTC), MAY 23-26, 2016, Taipei, TAIWAN. IEEE Transactions on Instrumentation and Measurement, 66(5), 953-963
Open this publication in new window or tab >>A Magnetic Ranging-Aided Dead-Reckoning Positioning System for Pedestrian Applications
Show others...
2017 (English)In: IEEE Transactions on Instrumentation and Measurement, ISSN 0018-9456, E-ISSN 1557-9662, Vol. 66, no 5, p. 953-963Article in journal (Refereed) Published
Abstract [en]

This paper investigates the applicability of a developed Magnetic Positioning System (MPS) as a support for a dead-reckoning inertial navigation system (DR-INS) for pedestrian applications. The integrated system combines the complementary properties of the separate systems, operating over long periods of time and in cluttered indoor areas with partial nonline-of-sight conditions. The obtained results show that the proposed approach can effectively improve the coverage area of the MPS and the operation time with bounded errors of the DR-INS. In particular, a solution that provides bounded position errors of 1-2 m over significantly long periods of time up to 45 min, in realistic indoor environments, is demonstrated. Moreover, system applicability is also shown in those scenarios where arbitrary orientations of the MPS mobile node are considered and an MPS position estimate is not available due to less than three distance measurements.

Place, publisher, year, edition, pages
IEEE, 2017
Keywords
Dead reckoning (DR), indoor positioning, inertial navigation, magnetic fields, range measurement, resonators
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-208236 (URN)10.1109/TIM.2017.2649918 (DOI)000399246000012 ()2-s2.0-85011295568 (Scopus ID)
Conference
IEEE International Instrumentation and Measurement Technology Conference (I2MTC), MAY 23-26, 2016, Taipei, TAIWAN
Funder
VINNOVA
Note

QC 20170628

Available from: 2017-06-28 Created: 2017-06-28 Last updated: 2017-06-28Bibliographically approved
Yajnanarayana, V., Magnusson, K. E. G., Brandt, R., Dwivedi, S. & Händel, P. (2017). Optimal Scheduling for Interference Mitigation by Range Information. IEEE Transactions on Mobile Computing, 16(11), 3167-3181
Open this publication in new window or tab >>Optimal Scheduling for Interference Mitigation by Range Information
Show others...
2017 (English)In: IEEE Transactions on Mobile Computing, ISSN 1536-1233, E-ISSN 1558-0660, Vol. 16, no 11, p. 3167-3181Article in journal (Refereed) Published
Place, publisher, year, edition, pages
IEEE, 2017
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-216601 (URN)10.1109/TMC.2017.2688417 (DOI)000412231100014 ()2-s2.0-85021809245 (Scopus ID)
Note

QC 20171115

Available from: 2017-11-15 Created: 2017-11-15 Last updated: 2017-11-15Bibliographically approved
Yajnanarayana, V., Dwivedi, S. & Händel, P. (2016). IR-UWB detection and fusion strategies using multiple detector types. In: IEEE Wireless Communications and Networking Conference, WCNC: . Paper presented at 2016 IEEE Wireless Communications and Networking Conference, WCNC 2016, Doha, Qatar, 3 April 2016 through 7 April 2016. Institute of Electrical and Electronics Engineers (IEEE), Article ID 7565140.
Open this publication in new window or tab >>IR-UWB detection and fusion strategies using multiple detector types
2016 (English)In: IEEE Wireless Communications and Networking Conference, WCNC, Institute of Electrical and Electronics Engineers (IEEE), 2016, article id 7565140Conference paper, Published paper (Refereed)
Abstract [en]

Optimal detection of ultra wideband (UWB) pulses in a UWB transceiver employing multiple detector types is proposed and analyzed in this paper. To enable the transceiver to be used for multiple applications, the designers have different types of detectors such as energy detector, amplitude detector, etc., built in to a single transceiver architecture. We propose several fusion techniques for fusing decisions made by individual IR-UWB detectors. In order to get early insight into theoretical achievable performance of these fusion techniques, we assess the performance of these fusion techniques for commonly used detector types like matched filter, energy detector and amplitude detector under Gaussian assumption. These are valid for ultra short distance communication and in UWB systems operating in millimeter wave (mmwave) band with high directivity gain. In this paper, we utilize the performance equations of different detectors, to device distinct fusion algorithms. We show that the performance can be improved approximately by 4 dB in terms of signal to noise ratio (SNR) for high probability of detection of a UWB signal (> 95%), by fusing decisions from multiple detector types compared to a standalone energy detector, in a practical scenario.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2016
Keywords
Neyman-Pearson test, Sensor Networks, Time of Arrival (TOA), Ultra Wideband (UWB), UWB ranging, Broadband networks, Communication channels (information theory), Matched filters, Millimeter waves, Radio transceivers, Signal detection, Signal to noise ratio, Time of arrival, Transceivers, Wireless telecommunication systems, Achievable performance, Gaussian assumption, Millimeter waves (mmwave), Multiple applications, Short distance communications, Ultra-wideband pulse, Ultra-wideband (UWB)
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-194858 (URN)10.1109/WCNC.2016.7565140 (DOI)000388603103020 ()2-s2.0-84989813883 (Scopus ID)9781467398145 (ISBN)
Conference
2016 IEEE Wireless Communications and Networking Conference, WCNC 2016, Doha, Qatar, 3 April 2016 through 7 April 2016
Note

QC 20161209

Available from: 2016-12-09 Created: 2016-11-01 Last updated: 2017-01-09Bibliographically approved
Dwivedi, S., De Angelis, A., Zachariah, D. & Händel, P. (2015). Joint Ranging and Clock Parameter Estimation by Wireless Round Trip Time Measurements. IEEE Journal on Selected Areas in Communications, 33(11), 2379-2390
Open this publication in new window or tab >>Joint Ranging and Clock Parameter Estimation by Wireless Round Trip Time Measurements
2015 (English)In: IEEE Journal on Selected Areas in Communications, ISSN 0733-8716, E-ISSN 1558-0008, Vol. 33, no 11, p. 2379-2390Article in journal (Refereed) Published
Abstract [en]

In this paper, we develop a new technique for estimating fine clock errors and range between two nodes simultaneously by two-way time-of-arrival measurements using impulse-radio ultrawideband signals. Estimators for clock parameters and the range are proposed, which are robust with respect to outliers. They are analyzed numerically and by means of experimental measurement campaigns. The technique and derived estimators achieve accuracies below 1 Hz for frequency estimation, below 1 ns for phase estimation, and 20 cm for range estimation, at a 4-m distance using 100-MHz clocks at both nodes. Therefore, we show that the proposed joint approach is practical and can simultaneously provide clock synchronization and positioning in an experimental system.

Place, publisher, year, edition, pages
IEEE Press, 2015
Keywords
Clock synchronization, range estimation, robust estimators, ultrawideband
National Category
Signal Processing
Identifiers
urn:nbn:se:kth:diva-176946 (URN)10.1109/JSAC.2015.2430521 (DOI)000363238300010 ()2-s2.0-84945119871 (Scopus ID)
Note

QC 20151216

Available from: 2015-12-16 Created: 2015-11-13 Last updated: 2017-12-01Bibliographically approved
Gholami, M. R., Dwivedi, S., Jansson, M. & Händel, P. (2015). Ranging without time stamps exchanging. In: ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings: . Paper presented at 40th IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2015, 19 April 2014 through 24 April 2014 (pp. 3981-3985). IEEE conference proceedings
Open this publication in new window or tab >>Ranging without time stamps exchanging
2015 (English)In: ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings, IEEE conference proceedings, 2015, p. 3981-3985Conference paper, Published paper (Refereed)
Abstract [en]

We investigate the range estimate between two wireless nodes without time stamps exchanging. Considering practical aspects of oscillator clocks, we propose a new model for ranging in which the measurement errors include the sum of two distributions, namely, uniform and Gaussian. We then derive an approximate maximum likelihood estimator (AMLE), which poses a difficult global optimization problem. To avoid the difficulty in solving the complex AMLE, we propose a simple estimator based on the method of moments. Numerical results show a promising performance for the proposed technique.

Place, publisher, year, edition, pages
IEEE conference proceedings, 2015
National Category
Signal Processing
Identifiers
urn:nbn:se:kth:diva-181568 (URN)10.1109/ICASSP.2015.7178718 (DOI)2-s2.0-84946048307 (Scopus ID)9781467369978 (ISBN)
Conference
40th IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2015, 19 April 2014 through 24 April 2014
Note

QC 20160229

Available from: 2016-02-29 Created: 2016-02-02 Last updated: 2016-02-29Bibliographically approved
Yajnanarayana, V., Dwivedi, S. & Händel, P. (2014). Design of impulse radio UWB transmitter with improved range performance using PPM signals. In: 2014 IEEE International Conference on Electronics, Computing and Communication Technologies (IEEE CONECCT): . Paper presented at 2014 IEEE International Conference on Electronics, Computing and Communication Technologies, IEEE CONECCT 2014, Bangalore, India, 6 January 2014 through 7 January 2014 (pp. 1-5). IEEE Computer Society
Open this publication in new window or tab >>Design of impulse radio UWB transmitter with improved range performance using PPM signals
2014 (English)In: 2014 IEEE International Conference on Electronics, Computing and Communication Technologies (IEEE CONECCT), IEEE Computer Society, 2014, p. 1-5Conference paper, Published paper (Refereed)
Abstract [en]

There are several practical challenges in designing an ultra wideband (UWB) device for communication. From the physical layer signaling perspective it is important to avoid the strong peaks in the transmitted signal to fully exploit the regulatory bodies power constraint requirements. This will result in increased range performance for the sensors. Design of the transmit impulse radio (IR) UWB signals under the practical constraints of hardware and regulatory body is a critical optimization issue in the UWB system design. In this paper, we propose a IR-UWB signaling, which is a variant of pulse position modulation (PPM) method and achieves an increased range performance under the practical constraints of hardware and Federal Communications Commission (FCC) regulations.

Place, publisher, year, edition, pages
IEEE Computer Society, 2014
Keywords
peak to average power (PAPR), pulse position modulation, time to digital converter (TDC), Ultra wideband, UWB communication
National Category
Signal Processing
Identifiers
urn:nbn:se:kth:diva-141049 (URN)10.1109/CONECCT.2014.6740281 (DOI)000349779700019 ()2-s2.0-84900578464 (Scopus ID)978-1-4799-2318-2 (ISBN)
Conference
2014 IEEE International Conference on Electronics, Computing and Communication Technologies, IEEE CONECCT 2014, Bangalore, India, 6 January 2014 through 7 January 2014
Note

QC 20140522

Available from: 2014-02-06 Created: 2014-02-06 Last updated: 2015-03-27Bibliographically approved
Dwivedi, S. & Händel, P. (2014). Precise Clock Parameter Estimation and Ground Truth Capture for Clock Error Measurements using FPGAs. In: 2014 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control and Communication (ISPCS): . Paper presented at 8th IEEE International Symposium on Precision Clock Synchronization for Measurement, Control, and Communication (ISPCS), SEP 22-26, 2014, Austin, TX (pp. 83-86). IEEE
Open this publication in new window or tab >>Precise Clock Parameter Estimation and Ground Truth Capture for Clock Error Measurements using FPGAs
2014 (English)In: 2014 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control and Communication (ISPCS), IEEE , 2014, p. 83-86Conference paper, Published paper (Refereed)
Abstract [en]

In this extended abstract we discuss and propose a mechanism to estimate clock parameters between two clocks using TDC. Simultaneously, we have proposed a ground truth capture methodology for clock error measurements. In particular, we have proposed an accurate way of measuring clock phase ground truth at any instant in time using delay lines in FPGA. Accuracy of clock phase ground truth measurement can be up to 16 ps. We have estimated clock parameters from measurements and have compared it with clock ground truth obtained using suggested methods. Relative frequency errors are estimated with RMSE of 0.46 Hz and phase error is estimated with RMSE of 0.29 ns.

Place, publisher, year, edition, pages
IEEE, 2014
Series
IEEE International Symposium on Precision Clock Synchronization for Meaurement Control and Communication, ISSN 1949-0305
Keywords
Synchronization, Networks
National Category
Signal Processing
Identifiers
urn:nbn:se:kth:diva-160809 (URN)10.1109/ISPCS.2014.6948696 (DOI)000349106400015 ()2-s2.0-84913613198 (Scopus ID)978-1-4799-2699-2 (ISBN)
Conference
8th IEEE International Symposium on Precision Clock Synchronization for Measurement, Control, and Communication (ISPCS), SEP 22-26, 2014, Austin, TX
Note

QC 20150227

Available from: 2015-02-27 Created: 2015-02-27 Last updated: 2015-02-27Bibliographically approved
Zachariah, D., De Angelis, A., Dwivedi, S. & Händel, P. (2014). Schedule-based sequential localization in asynchronous wireless networks. EURASIP Journal on Advances in Signal Processing, 2014(1), 16
Open this publication in new window or tab >>Schedule-based sequential localization in asynchronous wireless networks
2014 (English)In: EURASIP Journal on Advances in Signal Processing, ISSN 1687-6172, E-ISSN 1687-6180, Vol. 2014, no 1, p. 16-Article in journal (Refereed) Published
Abstract [en]

In this paper, we consider the schedule-based network localization concept, which does not requiresynchronization among nodes and does not involve communication overhead. The concept makesuse of a common transmission sequence, which enables each node to perform self-localization andto localize the entire network, based on noisy propagation-time measurements. We formulate theschedule-based localization problem as an estimation problem in a Bayesian framework. This pro-vides robustness with respect to uncertainty in such system parameters as anchor locations and timing devices. Moreover, we derive a sequential approximate maximum a posteriori (AMAP) estimator.The estimator is fully decentralized and copes with varying noise levels. By studying the fundamentalconstraints given by the considered measurement model, we provide a system design methodology which enables a scalable solution. Finally, we evaluate the performance of the proposed AMAPestimator by numerical simulations emulating an impulse-radio ultra-wideband (IR-UWB) wireless network.

Keywords
Wireless positioning, Cooperative localization, Asynchronous networks
National Category
Signal Processing
Research subject
Electrical Engineering
Identifiers
urn:nbn:se:kth:diva-141050 (URN)10.1186/1687-6180-2014-16 (DOI)000332014700001 ()2-s2.0-84904538074 (Scopus ID)
Funder
Vinnova
Note

QC 20140331

Available from: 2014-02-06 Created: 2014-02-06 Last updated: 2017-12-06Bibliographically approved
Yajnanarayana, V., Dwivedi, S., De Angelis, A. & Händel, P. (2014). Spectral efficient IR-UWB communication design for low complexity transceivers. EURASIP Journal on Wireless Communications and Networking, 2014(158)
Open this publication in new window or tab >>Spectral efficient IR-UWB communication design for low complexity transceivers
2014 (English)In: EURASIP Journal on Wireless Communications and Networking, ISSN 1687-1472, E-ISSN 1687-1499, Vol. 2014, no 158Article in journal (Refereed) Published
Abstract [en]

Ultra wideband (UWB) radio for communication has several challenges. From the physical layer perspective, asignaling technique should be optimally designed to work in synergy with the underneath hardware to achievemaximum performance. In this paper, we propose a variant of pulse position modulation (PPM) for physical layersignaling, which can achieve raw bitrate in excess of 150 Mbps on a low complexity in-house developed impulseradio UWB platform. The signaling system is optimized to maximize bitrate under practical constraints of lowcomplexity hardware and regulatory bodies. We propose a detector and derive its theoretical performance boundsand compare the performance in simulation in terms of symbol error rates (SER). Modifications to the signaling, whichcan increase the range by 4 times with a slight increase in hardware complexity, is proposed. Detectors for thismodification and a comparative study of the performance of the proposed UWB physical layer signaling schemes interms of symbol error rates are discussed.

Place, publisher, year, edition, pages
Springer, 2014
Keywords
Pulse position modulation, Sensor networks, Time-to-digital converter, Ultra wideband, UWB communication
National Category
Signal Processing
Identifiers
urn:nbn:se:kth:diva-153968 (URN)10.1186/1687-1499-2014-158 (DOI)000343715700001 ()2-s2.0-84909987450 (Scopus ID)
Funder
Vinnova
Note

QC 20141023

Available from: 2014-10-10 Created: 2014-10-10 Last updated: 2017-12-05Bibliographically approved
De Angelis, A., Dwivedi, S. & Händel, P. (2013). Application of time-to-digital converters to radio-frequency distance measurement. In: NoMe - TDC 2013 - 2013 IEEE Nordic Mediterranean Workshop on Time to Digital Converters, Proceedings: . Paper presented at 2013 1st IEEE Nordic Mediterranean Workshop on Time to Digital Converters, NoMe - TDC 2013; Perugia; Italy; 3 October 2013 through 3 October 2013 (pp. 31-35).
Open this publication in new window or tab >>Application of time-to-digital converters to radio-frequency distance measurement
2013 (English)In: NoMe - TDC 2013 - 2013 IEEE Nordic Mediterranean Workshop on Time to Digital Converters, Proceedings, 2013, p. 31-35Conference paper, Published paper (Refereed)
Abstract [en]

The application of TDCs to wireless distance measurement problems is evaluated by means of experimental tests using a realized system. The system is capable of measuring the round-trip-time of ultra-wideband radio pulses propagating between two active transceivers, utilizing a commercial TDC with sub-nanosecond resolution. The results show an operational range of approximately 30 m in an indoor environment, with a distance-measurement error of less than 0.5 m in approximately 90% of the considered cases. Further, a discussion of the fundamental error sources is provided, analyzing the effect of RF interference, timing jitter, received signal strength, and propagation conditions.

Keywords
Experimental test, Indoor environment, Operational range, Radio frequencies, Received signal strength, Sub nanoseconds, Time to digital converters, Ultra-wideband radio
National Category
Signal Processing
Identifiers
urn:nbn:se:kth:diva-137675 (URN)10.1109/NoMeTDC.2013.6658235 (DOI)2-s2.0-84892614404 (Scopus ID)978-147991184-4 (ISBN)
Conference
2013 1st IEEE Nordic Mediterranean Workshop on Time to Digital Converters, NoMe - TDC 2013; Perugia; Italy; 3 October 2013 through 3 October 2013
Note

QC 20140403

Available from: 2013-12-16 Created: 2013-12-16 Last updated: 2014-04-03Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-7450-8681

Search in DiVA

Show all publications