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Stenumgaard, Peter
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Publications (10 of 24) Show all publications
Savic, V., Larsson, E. G., Ferrer-Coll, J. & Stenumgaard, P. (2016). Kernel Methods for Accurate UWB-Based Ranging with Reduced Complexity. IEEE Transactions on Wireless Communications, 15(3), 1783-1793
Open this publication in new window or tab >>Kernel Methods for Accurate UWB-Based Ranging with Reduced Complexity
2016 (English)In: IEEE Transactions on Wireless Communications, ISSN 1536-1276, E-ISSN 1558-2248, Vol. 15, no 3, p. 1783-1793Article in journal (Refereed) Published
Abstract [en]

Accurate and robust positioning in multipath environments can enable many applications, such as search-and-rescue and asset tracking. For this problem, ultra-wideband (UWB) technology can provide the most accurate range estimates, which are required for range-based positioning. However, UWB still faces a problem with non-line-of-sight (NLOS) measurements, in which the range estimates based on time-of-arrival (TOA) will typically be positively biased. There are many techniques that address this problem, mainly based on NLOS identification and NLOS error mitigation algorithms. However, these techniques do not exploit all available information in the UWB channel impulse response. Kernel-based machine learning methods, such as Gaussian Process Regression (GPR), are able to make use of all information, but they may be too complex in their original form. In this paper, we propose novel ranging methods based on kernel principal component analysis (kPCA), in which the selected channel parameters are projected onto a nonlinear orthogonal high-dimensional space, and a subset of these projections is then used as an input for ranging. We evaluate the proposed methods using real UWB measurements obtained in a basement tunnel, and found that one of the proposed methods is able to outperform state-of-the-art, even if little training samples are available.

Place, publisher, year, edition, pages
IEEE Computer Society, 2016
Keywords
ranging, positioning, ultra-wideband, time-of-arrival, kernel principal component analysis, Gaussian process regression, machine learning
National Category
Communication Systems Signal Processing
Identifiers
urn:nbn:se:liu:diva-122424 (URN)10.1109/TWC.2015.2496584 (DOI)000372627500013 ()
Projects
COOPLOC
Funder
Swedish Foundation for Strategic Research
Note

Funding agencies: project Cooperative Localization (CoopLoc) - Swedish Foundation for Strategic Research (SSF); Security Link

Available from: 2015-11-02 Created: 2015-11-02 Last updated: 2017-12-01
Ferrer-Coll, J., Ben Slimane, S., Chilo, J. & Stenumgaard, P. (2015). Detection and Suppression of Impulsive Noise in OFDM Receiver. Wireless personal communications, 85(4), 2245-2259
Open this publication in new window or tab >>Detection and Suppression of Impulsive Noise in OFDM Receiver
2015 (English)In: Wireless personal communications, ISSN 0929-6212, E-ISSN 1572-834X, Vol. 85, no 4, p. 2245-2259Article in journal (Refereed) Published
Abstract [en]

In recent years, the use of wireless systems in industrial applications has experienced spectacular growth. Unfortunately, industrial environments often present impulsive noise which degrades the reliability of wireless systems. OFDM is an enhanced technology used in industrial communication to monitor the work and movement of employees using high quality video. However, OFDM is sensitive to high amplitude impulsive noise because the noise energy spreads among all OFDM sub-carriers. This paper proposes a receiver structure consisting of two stages: a detector stage combining Fishers Quadratic discriminant and Gaussian Hypothesis techniques, and a suppression stage optimized by setting well defined thresholds. The receiver structure has been tested by simulations and measurements providing an increment in the probability of detection and improving the system performance.

Place, publisher, year, edition, pages
SPRINGER, 2015
Keywords
Impulsive noise; Detection technique; Impulsive noise suppression; Industrial environments; Bit error rate (BER); OFDM
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:liu:diva-123794 (URN)10.1007/s11277-015-2902-4 (DOI)000365730000033 ()
Available from: 2016-01-11 Created: 2016-01-11 Last updated: 2017-11-30
Savic, V., Ferrer-Coll, J., Ängskog, P., Chilo, J., Stenumgaard, P. & Larsson, E. G. (2015). Measurement Analysis and Channel Modeling for TOA-Based Ranging in Tunnels. IEEE Transactions on Wireless Communications, 14(1), 456-467
Open this publication in new window or tab >>Measurement Analysis and Channel Modeling for TOA-Based Ranging in Tunnels
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2015 (English)In: IEEE Transactions on Wireless Communications, ISSN 1536-1276, E-ISSN 1558-2248, Vol. 14, no 1, p. 456-467Article in journal (Refereed) Published
Abstract [en]

A robust and accurate positioning solution is required to increase the safety in GPS-denied environments. Although there is a lot of available research in this area, little has been done for confined environments such as tunnels. Therefore, we organized a measurement campaign in a basement tunnel of Linköping university, in which we obtained ultra-wideband (UWB) complex impulse responses for line-of-sight (LOS), and three non-LOS (NLOS) scenarios. This paper is focused on time-of-arrival (TOA) ranging since this technique can provide the most accurate range estimates, which are required for range-based positioning. We describe the measurement setup and procedure, select the threshold for TOA estimation, analyze the channel propagation parameters obtained from the power delay profile (PDP), and provide statistical model for ranging. According to our results, the rise-time should be used for NLOS identification, and the maximum excess delay should be used for NLOS error mitigation. However, the NLOS condition cannot be perfectly determined, so the distance likelihood has to be represented in a Gaussian mixture form. We also compared these results with measurements from a mine tunnel, and found a similar behavior.

Keywords
tunnels, channel modeling, time of arrival, ultra-wideband, impulse response, ranging, positioning
National Category
Communication Systems Signal Processing
Identifiers
urn:nbn:se:liu:diva-113308 (URN)10.1109/TWC.2014.2350493 (DOI)000349675400037 ()
Projects
COOPLOC
Funder
Swedish Foundation for Strategic Research
Note

he work was supported by the project Cooperative Localization (CoopLoc), funded by the Swedish Foundation for Strategic Research (SSF). The associate editor coordinating the review of this paper and approving it for publication was A. Zajic.

Available from: 2015-01-15 Created: 2015-01-15 Last updated: 2017-12-05
Eliardsson, P., Axell, E., Wiklundh, K. C. & Stenumgaard, P. (2014). Channel Selection that Considers the Impulse Characteristics of the Local Interference. In: 2014 INTERNATIONAL SYMPOSIUM ON ELECTROMAGNETIC COMPATIBILITY (EMC EUROPE): . Paper presented at International Symposium on Electromagnetic Compatibility (EMC Europe) (pp. 517-522). IEEE
Open this publication in new window or tab >>Channel Selection that Considers the Impulse Characteristics of the Local Interference
2014 (English)In: 2014 INTERNATIONAL SYMPOSIUM ON ELECTROMAGNETIC COMPATIBILITY (EMC EUROPE), IEEE , 2014, p. 517-522Conference paper, Published paper (Refereed)
Abstract [en]

In this paper, we propose improved methods to select the most suitable frequency for transmission by also including information about the local interference environment. Knowledge of the local interference is included in the frequency selection through estimation of the interference power, and in addition through estimation of the impulsiveness of the interference. We evaluate the methods for both unicast and multicast scenarios using different performance measures, and show that the suggested methods can significantly reduce the bit error probability in relevant scenarios.

Place, publisher, year, edition, pages
IEEE, 2014
Series
IEEE International Symposium on Electromagnetic Compatibility, ISSN 2158-110X
Keywords
Frequency selection; local interference; impulse noise
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:liu:diva-123348 (URN)000364988600096 ()978-1-4799-3226-9 (ISBN)
Conference
International Symposium on Electromagnetic Compatibility (EMC Europe)
Available from: 2015-12-11 Created: 2015-12-11 Last updated: 2015-12-11
Savic, V., Larsson, E. G., Ferrer-Coll, J. & Stenumgaard, P. (2014). Kernel Principal Component Analysis for UWB-Based Ranging. In: IEEE International Workshop on Signal Processing Advances in Wireless Communications (SPAWC), 2014: . Paper presented at 15th IEEE International Workshop on Signal Processing Advances in Wireless Communications (SPAWC 2014), 22-25 June 2014, Toronto, Canada (pp. 145-149).
Open this publication in new window or tab >>Kernel Principal Component Analysis for UWB-Based Ranging
2014 (English)In: IEEE International Workshop on Signal Processing Advances in Wireless Communications (SPAWC), 2014, 2014, p. 145-149Conference paper, Published paper (Refereed)
Abstract [en]

Accurate positioning in harsh environments can enable many application, such as search-and-rescue in emergency situations. For this problem, ultra-wideband (UWB) technology can provide the most accurate range estimates, which are required for range-based positioning. However, it still faces a problem in non-line-of-sight (NLOS) environments, in which range estimates based on time-of-arrival (TOA) are positively biased. There are many techniques that try to address this problem, mainly based on NLOS identification and NLOS error mitigation. However, these techniques do not exploit all available information from the UWB channel impulse response. In this paper, we propose a novel ranging technique based on kernel principal component analysis (kPCA), in which the selected channel parameters are projected onto nonlinear orthogonal high-dimensional space, and a subset of these projections is then used for ranging. We tested this technique using UWB measurements obtained in a basement tunnel of Linkoping university, and found that it provides much better ranging performance comparing with standard techniques based on PCA and TOA.

Series
IEEE International Workshop on Signal Processing Advances in Wireless Communications, ISSN 2325-3789
Keywords
ranging, ultra-wideband, time-of-arrival, kernel principal component analysis, machine learning
National Category
Communication Systems Signal Processing
Identifiers
urn:nbn:se:liu:diva-106648 (URN)10.1109/SPAWC.2014.6941337 (DOI)000348859000030 ()978-1-4799-4903-8 (ISBN)
Conference
15th IEEE International Workshop on Signal Processing Advances in Wireless Communications (SPAWC 2014), 22-25 June 2014, Toronto, Canada
Projects
COOPLOC
Funder
Swedish Foundation for Strategic Research eLLIIT - The Linköping‐Lund Initiative on IT and Mobile Communications
Available from: 2014-05-16 Created: 2014-05-16 Last updated: 2016-08-31
Holm, P. D., Persson, D., Wiklundh, K. & Stenumgaard, P. (2014). On multiple-input-multiple-output performance for Terrestrial Trunked Radio systems. IET COMMUNICATIONS, 8(14), 2484-2488
Open this publication in new window or tab >>On multiple-input-multiple-output performance for Terrestrial Trunked Radio systems
2014 (English)In: IET COMMUNICATIONS, ISSN 1751-8628, Vol. 8, no 14, p. 2484-2488Article in journal (Refereed) Published
Abstract [en]

Measurements for outdoor multiple-input-multiple-output (MIMO) capacity assessment are generally technically complicated, time consuming and expensive activities and few results are therefore published in the literature. Terrestrial Trunked Radio (TETRA) systems suffer from poor capacity and could be significantly improved by MIMO technology. However, performing outdoor channel measurements in relevant environments is very difficult because of interference problems with operating systems. In this study, the authors propose an estimation of the MIMO capacity for TETRA systems, based on outdoor MIMO measurements carried out at 300 MHz.

Place, publisher, year, edition, pages
Institution of Engineering and Technology (IET), 2014
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:liu:diva-112056 (URN)10.1049/iet-com.2014.0098 (DOI)000342899000009 ()
Note

Funding Agencies|Swedish governmental strategic research center Security Link

Available from: 2014-11-17 Created: 2014-11-13 Last updated: 2014-11-17
Fors, K., Wiklundh, K. & Stenumgaard, P. (2013). A simple measurement method to derive the impulsiveness correction factor for communication performance estimation. IEEE transactions on electromagnetic compatibility (Print), 55(5), 834-841
Open this publication in new window or tab >>A simple measurement method to derive the impulsiveness correction factor for communication performance estimation
2013 (English)In: IEEE transactions on electromagnetic compatibility (Print), ISSN 0018-9375, E-ISSN 1558-187X, Vol. 55, no 5, p. 834-841Article in journal (Refereed) Published
Abstract [en]

Today, no simple methods are available for measurements of interference signals that give a proper indication of the impact in terms of the bit error probability (BEP) on a digital radio receiver. Such measure should quantify the corresponding impact and the measurements should be relatively easy to perform. By only using the root mean square (RMS) value of the interference average power the BEP can be underestimated with several magnitudes. To address this problem, an impulsiveness correction factor (ICF) has earlier been proposed to adjust for these errors. The ICF opens up for considerably more accurate BEP estimations whereas the simplicity in the calculations is maintained. However, how to determine the ICF for an arbitrary interference source through measurements has not earlier been known. In this paper, we show that the ICF can be obtained in two alternative ways. One way is to use the measured amplitude probability distribution (APD). The other way is to use the peak- and RMS values from standard measurement detectors. Both methods take the interference waveform properties into consideration and the BEP can thus be more accurately estimated.

Place, publisher, year, edition, pages
IEEE, 2013
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-99383 (URN)10.1109/TEMC.2012.2236090 (DOI)000325848700004 ()
Available from: 2013-10-17 Created: 2013-10-17 Last updated: 2017-12-06Bibliographically approved
Stenumgaard, P., Persson, D., Wiklundh, K. & Larsson, E. G. (2013). An Early-Warning Service for Emerging Communication Problems in Security and Safety Applications. IEEE Communications Magazine, 51(5), 186-192
Open this publication in new window or tab >>An Early-Warning Service for Emerging Communication Problems in Security and Safety Applications
2013 (English)In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 51, no 5, p. 186-192Article in journal (Refereed) Published
Abstract [en]

Experience has shown that unpredictable disruption of communications during emergency operations can have severe consequences both for personal safety and for the ability to conduct a successful operation. An early-warning service for emerging communication disruption due to both unintentional interference and jamming, would therefore be a significant contribution for increased safety and security in such operations. We propose a solution for such an early-warning service both on the terminal and on higher system level. The solution is based on historical recorded data of both local and global information such as signal-to-interference ratio, interference classification, and position. We show by an example that with this service implemented, the operator will have increased time to take actions before a disruption occurs on a specific terminal.

Place, publisher, year, edition, pages
IEEE, 2013
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-86254 (URN)10.1109/MCOM.2013.6515064 (DOI)000318998600023 ()
Projects
Security link
Funder
Swedish Research Council
Available from: 2012-12-12 Created: 2012-12-12 Last updated: 2017-12-07
Eliardsson, P., Wiklundh, K., Axell, E., Johansson, B. & Stenumgaard, P. (2013). Analysis of the local HF interference environment at a military platform. In: Nordic HF Conference Proceedings 2013: . Paper presented at 10th Nordic HF conference (HF 13), 12-14 August 2013, Fårö, Sweden (pp. 3.4).
Open this publication in new window or tab >>Analysis of the local HF interference environment at a military platform
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2013 (English)In: Nordic HF Conference Proceedings 2013, 2013, p. 3.4-Conference paper, Published paper (Refereed)
Abstract [en]

High frequency (HF) communications are of vital importance for modern military operations. However, HF channels are touchy and unpredictable, prone to noise, fading, jamming, and interference. Therefore, a number of prediction tools for channel selection have been developed. However, existing tools do not consider the local actual electromagnetic interference at receivers located on navy and army platforms. Measurements on military platforms show that also the local interference environment can be crucial and has large variations in frequency and time. In this paper we analyze the levels and dynamics of local interference from a typical military platform. We show that the variations regarding interference waveform can be very large between two consecutive seconds of measurement. This means that the interference impact in terms of bit error probability also will be very large between such consecutive seconds. The overall conclusion is that future methods for HF-frequency selection would be significantly improved by considering the characteristics of local interference from electrical equipment.

National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-96676 (URN)
Conference
10th Nordic HF conference (HF 13), 12-14 August 2013, Fårö, Sweden
Available from: 2013-08-22 Created: 2013-08-22 Last updated: 2013-08-30Bibliographically approved
Ferrer-Coll, J., Ängskog, P., Elofsson, C., Chilo, J. & Stenumgaard, P. (2013). Antenna Cross Correlation and Ricean K -Factor Measurements in Indoor Industrial Environments at 433 and 868 MHz. Wireless personal communications, 73(3), 587-593
Open this publication in new window or tab >>Antenna Cross Correlation and Ricean K -Factor Measurements in Indoor Industrial Environments at 433 and 868 MHz
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2013 (English)In: Wireless personal communications, ISSN 0929-6212, E-ISSN 1572-834X, Vol. 73, no 3, p. 587-593Article in journal (Refereed) Published
Abstract [en]

The Ricean K-factor and antenna diversity properties for indoor industrial environments have been characterized for 433 and 868 MHz. The high amount of metallic structures gives a multipath environment that heavily differs from other environments e.g. indoor office environments. The results show that low correlation between receiving antennas can be achieved for shorter antenna distances than in other environments.

Place, publisher, year, edition, pages
Springer, 2013
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-92816 (URN)10.1007/s11277-013-1204-y (DOI)000327861700013 ()
Funder
Knowledge Foundation
Available from: 2013-05-23 Created: 2013-05-23 Last updated: 2017-12-06
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