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Yajnanarayana, VijayaORCID iD iconorcid.org/0000-0002-4265-9490
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Publications (10 of 21) Show all publications
Yajnanarayana, V. & Händel, P. (2018). Performance evaluation of IR-UWB detectors and fusion techniques for UWB transceiver platforms. International Journal of Ultra Wideband Communications and Systems, 3(4), 177-191
Open this publication in new window or tab >>Performance evaluation of IR-UWB detectors and fusion techniques for UWB transceiver platforms
2018 (English)In: International Journal of Ultra Wideband Communications and Systems, ISSN 1758-728X, Vol. 3, no 4, p. 177-191Article in journal (Refereed) Published
Abstract [en]

In this paper, we analyse the performance of a multi-pulse impulse radio based ultra-wideband (IR-UWB) detector in an AWGN setting and provide different fusion strategies for fusing these detector outputs. To enable the transceiver to be used for multiple applications, the designers have different types of detectors such as energy detectors, amplitude detectors, etc., built in to a single transceiver architecture. In this paper, we derive the detection performance equation for commonly used detectors in terms of false alarm rate, shape of the pulse, and number of UWB pulses used in the detection and apply these in the fusion algorithms. We show that the performance can be improved by approximately 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
Inderscience Enterprises Ltd., 2018
Keywords
Neyman-Pearson test, Sensor networks, Time of arrival, TOA, Ultra wideband, UWB, UWB ranging
National Category
Signal Processing
Identifiers
urn:nbn:se:kth:diva-238358 (URN)10.1504/IJUWBCS.2018.092426 (DOI)2-s2.0-85048791037 (Scopus ID)
Note

QC 20181031

Available from: 2018-10-31 Created: 2018-10-31 Last updated: 2018-10-31Bibliographically approved
Yajnanarayana, V. & Händel, P. (2017). Joint Estimation of TOA and PPM Symbols Using Sub-Nyquist Sampled IR-UWB Signal. IEEE Communications Letters, 21(4), 949-952
Open this publication in new window or tab >>Joint Estimation of TOA and PPM Symbols Using Sub-Nyquist Sampled IR-UWB Signal
2017 (English)In: IEEE Communications Letters, ISSN 1089-7798, E-ISSN 1558-2558, Vol. 21, no 4, p. 949-952Article in journal (Refereed) Published
Abstract [en]

Impulse radio ultra wideband (UWB) signals are used in various applications which require joint localization and communication. Due to the large bandwidth of the UWB signal, the estimation of time of arrival (TOA) and data symbols requires high sampling rates. This letter describes a sub-Nyquist rate receiver, which can jointly estimate TOA and data symbols. We first represent the received UWB signal in a new domain in which it is sparse. Then, we design physical layer waveforms and estimation algorithms to exploit this sparsity for joint estimation of TOA and pulse position modulation data symbols. The performance of the receiver is compared against the maximum likelihood (ML)-based receiver using an IEEE 802.15.4a CM1 line of sight UWB channel model. The proposed algorithm yields performance similar to the ML-based algorithms with only a fraction of sampling rate at high SNRs (> 25 dB).

Place, publisher, year, edition, pages
IEEE, 2017
Keywords
Time of arrival (TOA), ultra wideband (UWB), UWB ranging, compressive sampling, sparse signal processing
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-208261 (URN)10.1109/LCOMM.2017.2650231 (DOI)000399388400066 ()2-s2.0-85018190129 (Scopus ID)
Note

QC 20170626

Available from: 2017-06-26 Created: 2017-06-26 Last updated: 2017-06-26Bibliographically 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
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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
Yajanarayana, V., Dwivedi, S. & Händel, P. (2016). Multi Detector Fusion of Dynamic TOA Estimation using Kalman Filter. In: : . Paper presented at 2016 IEEE International Conference on Communications, ICC 2016. IEEE conference proceedings
Open this publication in new window or tab >>Multi Detector Fusion of Dynamic TOA Estimation using Kalman Filter
2016 (English)Conference paper, Published paper (Other academic)
Abstract [en]

In this paper, we propose fusion of dynamic TOA (time of arrival) from multiple non-coherent detectors like energy detectors operating at sub-Nyquist rate through Kalman filtering. We also show that by using multiple of these energy detectors, we can achieve the performance of a digital matched filter implementation in the AWGN (additive white Gaussian noise) setting. We derive analytical expression for number of energy detectors needed to achieve the matched filter performance. We demonstrate in simulation the validity of our analytical approach. Results indicate that number of energy detectors needed will be high at low SNRs and converge to a constant number as the SNR increases. We also study the performance of the strategy proposed using IEEE 802.15.4a CM1 channel model and show in simulation that two sub-Nyquist detectors are sufficient to match the performance of digital matched filter.

Place, publisher, year, edition, pages
IEEE conference proceedings, 2016
Keywords
Time of arrival (TOA), ultra wideband (UWB), UWB ranging
National Category
Signal Processing
Identifiers
urn:nbn:se:kth:diva-181490 (URN)10.1109/ICC.2016.7511611 (DOI)2-s2.0-84981333292 (Scopus ID)978-147996664-6 (ISBN)
Conference
2016 IEEE International Conference on Communications, ICC 2016
Note

QS 20160318

QC 20161215

Available from: 2016-02-02 Created: 2016-02-02 Last updated: 2016-12-15Bibliographically 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
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
Rupp, C., Valdes, G. O., Ahmed, Z. & Yajnanarayana, V. (2014). Unit Testing and Analysis Using a Stored Reference Signal. us 20140040668A1.
Open this publication in new window or tab >>Unit Testing and Analysis Using a Stored Reference Signal
2014 (English)Patent (Other (popular science, discussion, etc.))
Abstract [en]

Method and system for a test process. The method may include performing tests on one or more units under test (UUTs). At least one test on one or more UUTs may be performed. A signal may be acquired from the UUT. A reference signal may be retrieved. The reference signal may be derived from a transmitted signal characteristic of the UUT. The signal may be analyzed with respect to the reference signal. Results, useable to characterize the one or more UUTs, from performing the at least one test on the one or more UUTs may be stored. The reference signal may be derived from an initial test and may be stored for subsequent retrieval. A respective reference signal may be retrieved for all UUTs of the one or more UUTs for a respective test. The signal may be a radio frequency signal. The UUT may be a wireless mobile device. 

National Category
Electrical Engineering, Electronic Engineering, Information Engineering Signal Processing
Identifiers
urn:nbn:se:kth:diva-120149 (URN)
Patent
US 20140040668A1
Note

QS 2015

Available from: 2013-04-01 Created: 2013-04-01 Last updated: 2015-04-09Bibliographically approved
Yajnanarayana, V., Dwivedi,, S., De Angelis, A. & Händel, P. (2013). Design of impulse radio UWB transmitter for short range communications using PPM signals. In: IEEE International Conference on Electronics, Computing and Communication Technologies (CONECCT), 2013: . Paper presented at IEEE International Conference on Electronics, Computing and Communication Technologies (CONECCT), 17-19 Jan. 2013,Bangalore (pp. 1-4). IEEE conference proceedings
Open this publication in new window or tab >>Design of impulse radio UWB transmitter for short range communications using PPM signals
2013 (English)In: IEEE International Conference on Electronics, Computing and Communication Technologies (CONECCT), 2013, IEEE conference proceedings, 2013, p. 1-4Conference paper, Published paper (Refereed)
Abstract [en]

There are several practical challenges in designing an ultra wideband (UWB) device for communication. From the physical layer perspective, signaling technique should be optimally designed to work in synergy with the underneath hardware to achieve maximum performance. In this paper we propose a new cost effective hardware architecture for UWB communication and propose a variant of pulse position modulation (PPM) method which achieves maximum bit rate under the practical constraints imposed by UWB hardware.

Place, publisher, year, edition, pages
IEEE conference proceedings, 2013
Keywords
UWB communication, Ultra wideband, peak to average power (PAPR), pulse position modulation, time to digital converter (TDC)
National Category
Signal Processing
Identifiers
urn:nbn:se:kth:diva-119858 (URN)10.1109/CONECCT.2013.6469303 (DOI)000319415800023 ()2-s2.0-84875486415 (Scopus ID)978-1-4673-4609-2 (ISBN)
Conference
IEEE International Conference on Electronics, Computing and Communication Technologies (CONECCT), 17-19 Jan. 2013,Bangalore
Funder
Vinnova
Note

QC 20130408

Available from: 2013-03-24 Created: 2013-03-24 Last updated: 2014-10-30Bibliographically approved
Sartaj, C., Yajnanarayana, V. & Zakir, A. (2012). Blind Mechanism for Demodulating Offset QPSK Signals in the Presence of Carrier Phase Error. us 8605828-B2.
Open this publication in new window or tab >>Blind Mechanism for Demodulating Offset QPSK Signals in the Presence of Carrier Phase Error
2012 (English)Patent (Other (popular science, discussion, etc.))
Abstract [en]

A computer-implemented system and method for blind demodulation of an offset QPSK input signal, involving repeatedly performing a set of operations, including: (a) applying a phase correction to the input signal based on an estimate of a carrier phase offset of the input signal to obtain a first modified signal; (b) shifting a quadrature component of the first modified signal by half a symbol period relative to an inphase component to obtain a second modified signal; (c) extracting a first sequence of symbols from the second modified signal, where the extraction includes estimating a symbol timing offset from the second modified signal; (d) performing hard-decision demodulation on the first sequence of symbols to obtain a second sequence of reference symbols; (e) computing a phase difference between the first sequence of symbols and second sequence of reference symbols; and (f) updating the carrier phase offset estimate using the phase difference. 

National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-120146 (URN)
Patent
US 8605828-B2 (2013-12-10)
Note

QC 20141024

Available from: 2013-04-01 Created: 2013-04-01 Last updated: 2014-11-10Bibliographically approved
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Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-4265-9490

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