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Impulsive Noise Detec-tion in OFDM Systems with PAPR Reduction
KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Radio Systems Laboratory (RS Lab). University of Gävle, Sweden .
KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Radio Systems Laboratory (RS Lab).ORCID iD: 0000-0001-9697-9978
2014 (English)Conference paper (Other academic)
Abstract [en]

Impulsive noise is a major source of degradation in industrial communications. Orthogonal frequency-division multiplexing (OFDM) is an extended technique used in many industrial communications, however the performance of OFDM systems is reduced under an impulsive noise source. To increase the system performance, impulsive noise detection and suppression techniques can be designed in the communication system. OFDM has high levels of peak-to-average power ratio (PAPR), thus PAPR reduction techniques, such as selected mapping (SLM), are implemented in OFDM systems. This paper proposes an impulsive noise detection exploiting the statistical properties of the OFDM envelope when applying SLM. The proposed detection technique increases the probability of detection and improves the BER of the communication system compared to other impulsive detection techniques.

Place, publisher, year, edition, pages
, IEEE International Symposium on Electromagnetic Compatibility, ISSN 1077-4076 ; 6930962
Keyword [en]
Impulsive noise, OFDM, PAPR, selected mapping(SEM), wireless communications, impulsive noise detection
National Category
URN: urn:nbn:se:kth:diva-145424DOI: 10.1109/EMCEurope.2014.6930962ISI: 000364988600097ScopusID: 2-s2.0-84908673096ISBN: 978-1-4799-3226-9OAI: diva2:718271
2014 International Symposium on Electromagnetic Compatibility, EMC Europe 2014; Swedish Exhibition and Congress CentreGothenburg; Sweden; 1 September 2014 through 4 September 2014

QC 20150611

QC 20151214

Available from: 2014-05-20 Created: 2014-05-20 Last updated: 2015-12-15Bibliographically approved
In thesis
1. Channel Characterization and WirelessCommunication Performance in Industrial Environments
Open this publication in new window or tab >>Channel Characterization and WirelessCommunication Performance in Industrial Environments
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The demand for wireless communication systems in industry has grown in recent years. Industrial wireless communications open up a number of new possibilities for highly flexible and efficient automation solutions. However, a good part of the industry refuses to deploy wireless solutions products due to the high reliability requirements in industrial communications that are not achieved by actual wireless systems. Industrial environments have particular characteristics that differ from typical indoor environments such as office or residential environments. The metallic structure and building dimensions result in time dispersion in the received signal. Moreover, electrical motors, vehicles and repair work are sources of electromagnetic interference (EMI) that have direct implications on the performance of wireless communication links. These degradations can reduce the reliability of communications, increasingthe risk of material and personal incidents. Characterizing the sources of degradations in different industrial environments and improving the performance of wireless communication systems by implementing spatial diversity and EMI mitigation techniques are the main goals of this thesis work.

Industrial environments are generally considered to be environments with a significant number of metallic elements and EMI sources. However, with the penetration of wireless communication in industrial environments, we realize that not all industrial environments follow this rule of thumb. In fact, we find a wide range of industrial environments with diverse propagation characteristics and degradation sources. To improve the reliability of wireless communication systems in industrial environments, proper radio channel characterization is needed for each environment. This thesis explores a variety of industrial environments and attempts to characterize the sources of degradation by extracting representative channel parameters such as time dispersion, path loss and electromagnetic interference. The result of this characterization provides an industrial environment classification with respect to time dispersion and EMI levels, showing the diverse behavior of propagation channels in industry.

The performance of wireless systems in industrial environments can be improved by introducing diversity in the received signal. This can be accomplished by exploiting the spatial diversity offered when multiple antennas are employed at the transmitter with the possibility of using one or more antennas at the receiver. For maximum diversity gain, a proper separation between the different antennas is needed. However, this separation could be a limiting factor in industrial environments with confined spaces. This thesis investigates the implication of antenna separation on system performance and discusses the benefits of spatial diversity in industrial environments with high time dispersion conditions where multiple antennas with short antenna separations can be employed.

To ensure reliable wireless communication in industrial environments, all types of electromagnetic interference should be mitigated. The mitigation of EMI requires interference detection and subsequent interference suppression.This thesis looks at impulsive noise detection and suppression techniques for orthogonal frequency division multiplexing (OFDM) based on wide-band communication systems in AWGN and multi-path fading channels. For this,a receiver structure with cooperative detection and suppression blocks is proposed.This thesis also investigates the performance of the proposed receiver structure for diverse statistical properties of the transmitted signal and electromagnetic interference.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2014. xiii, 81 p.
TRITA-ICT-COS, ISSN 1653-6347 ; 14:02
National Category
Research subject
Electrical Engineering
urn:nbn:se:kth:diva-145158 (URN)
Public defence
2014-06-04, Sal D, KTH - ICT, Isafjordsgatan 39, Kista, 13:00 (English)

QC 20140520

Available from: 2014-05-20 Created: 2014-05-13 Last updated: 2014-05-20Bibliographically approved

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Ferrer-Coll, JavierSimane, Ben
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