hig.sePublications
Change search
Refine search result
1 - 12 of 12
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • harvard-cite-them-right
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • sv-SE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • de-DE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Rows per page
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sort
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
Select
The maximal number of hits you can export is 250. When you want to export more records please use the Create feeds function.
  • 1.
    Panigrahi, Smruti Ranjan
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electrical Engineering, Mathematics and Science, Electronics. KTH, Teknisk informationsvetenskap.
    Unraveling the potential of Wireless Sensors in the age of Industry 4.02021Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Human civilization is now staring at the fourth industrial revolution, where wireless technologies will play a pivotal role in its success. Wireless sensors’ role is also becoming more significant in the present day to facilitate industrial automation and manufacturing processes and address health, safety, and environmental concerns. However, wireless communication is primarily unreliable due to noise, interference, and channel fading. Several factors, like hardware quality of the sensors, imperfect calibration, harsh environment, and deployment locations, can also affect the sensors’ observation, which throws further challenges for information reliability and latency. These challenges must be addressed urgently for the success of Industry 4.0.

    The scope of this Ph.D. research works is broadly divided into two research problems. The first research problem, this dissertation investigates, is how to retrieve and process the local detection of wireless sensors in critical industrial applications. Diversity techniques are known to improve the reliability of wireless communication. Therefore, various spatial diversity techniques using an antenna array with a large number of elements at the receiver are investigated first to find out the suitability of wireless communication for critical industrial applications. Moreover, in order to improve sensors’ detection performance, distributed detection methods are popularly used. This Ph.D.thesis proposes techniques and algorithms to transmit and fuse local decisions from non-identical wireless sensors, e.g., sensors with different detection capabilities. The fusion center utilizes the spatial diversity or spatial multiplexing based scheme to retrieve the sensors’ local decisions.

    In order to design a reliable wireless communication system, it is highly desirable to understand the channel characteristics of the wireless medium. The second research problem this dissertation address is to characterize the radio propagation channel in one of the millimeter wave frequency bands. Millimeter wave wireless technologies bring several benefits, which can further revolutionize the industrial manufacturing and automation processes. In this.D. research work, the radio channel measurements were carried out at the24 GHz ISM band in various industrial environments within Gävle, Sweden, with the help of highly competent in-house assembled affordable testbeds. Several radio propagation aspects, like, the large scale fading, small scale fading, multipath propagation, and Doppler effect, are studied.

  • 2.
    Panigrahi, Smruti Ranjan
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electrical Engineering, Mathematics and Science, Electronics.
    Björsell, Niclas
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electrical Engineering, Mathematics and Science, Electronics.
    Bengtsson, Mats
    KTH Royal Institute of Technology, Stockholm, Sweden .
    Data Fusion in the Air With Non-Identical Wireless Sensors2019In: IEEE Transactions on Signal and Information Processing over Networks, ISSN 2373-776X, Vol. 5, no 4, p. 646-656Article in journal (Refereed)
    Abstract [en]

    In this paper, a multi-hypothesis distributed detection technique with non-identical local detectors is investigated. Here, for a global event, some of the sensors/detectors can observe the whole set of hypotheses, whereas the remaining sensors can either see only some aspects of the global event or infer more than one hypothesis as a single hypothesis. Another possible option is that different sensors provide complementary information. The local decisions are sent over a multiple access radio channel so that the data fusion is formed in the air before reaching the decision fusion center (DFC). An optimal energy fusion rule is formulated by considering the radio channel effects and the reliability of the sensors together, and a closed-form solution is derived. A receive beamforming algorithm, based on a modification of Lozano's algorithm, is proposed to equalize the channel gains from different sensors. Sensors with limited detection capabilities are found to boost the overall system performance when they are used along with fully capable sensors. The additional transmit power used by these sensors is compensated by the designed fusion rule and the antenna array gain. Additionally, the DFC, equipped with a large antenna array, can reduce the overall transmit energy consumption without sacrificing the detection performance.

  • 3.
    Panigrahi, Smruti Ranjan
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electrical Engineering, Mathematics and Science, Electronics.
    Björsell, Niclas
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electrical Engineering, Mathematics and Science, Electronics.
    Bengtsson, Mats
    KTH.
    Distributed detection with non-identical sensors: Fusion in the air or at the receiver?2020In: 2020 IEEE Wireless Communications and Networking Conference (WCNC), 2020, p. 1-6Conference paper (Refereed)
    Abstract [en]

    In this research paper, fusion in the air (FIA) and fusion at the receiver (FAR) - two different approaches of multi-hypotheses distributed detection for wireless sensor networks with decision fusion center (DFC) - are investigated. The DFC is equipped with multiple antennas, whereas each of the sensors has a single antenna. The performance of these schemes is evaluated in two different scenarios; with identical sensors and non-identical sensors, in terms of their detection capabilities. For a global event, identical sensors observe an equal number of hypotheses, whereas the number of hypotheses detected by the non-identical sensors can be different. When all the sensors in the network are identical, the FIA based technique has a higher detection probability in transmit power constrained situations. However, the FAR scheme performs better when the transmit power budget is higher. Additionally, in the network with non-identical wireless sensors, the FAR based technique is unable to exploit the benefits from the local decisions of the low capability sensors. Therefore the FAR scheme has a lower detection probability than the FIA based approach.

  • 4.
    Panigrahi, Smruti Ranjan
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electrical Engineering, Mathematics and Science, Electronics. School of Electrical Engineering and Computer Science, KTH Royal Institute of Technology, Sweden.
    Björsell, Niclas
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electrical Engineering, Mathematics and Science, Electronics.
    Bengtsson, Mats
    School of Electrical Engineering and Computer Science, KTH Royal Institute of Technology, Sweden.
    Distributed detection with non-identical wireless sensors for industrial applications2019In: Proceedings of the IEEE International Conference on Industrial Technology, IEEE, 2019, p. 1403-1408Conference paper (Refereed)
    Abstract [en]

    There has been very little exploration when it comes to design distributed detection techniques and data fusion rules with non-identical sensors. This concept can be utilized in many possible applications within industrial automation, surveillance and safety. Here, for a global event, some of the sensors/detectors in the network can observe the full set of the hypotheses, whereas the remaining sensors infer more than one hypotheses as a single hypothesis. The local decisions are sent to the decision fusion center (DFC) over a multiple access wireless channel. In this paper, a fusion rule based on minimization of variance of the local mis-detection is proposed. The presence of sensors with limited detection capabilities is found to have a positive impact on the overall system performance, both in terms of probability of detection and transmit power consumption. Additionally, when the DFC is equipped with a large antenna array, the overall transmit power consumption can be reduced without sacrificing the detection performance. 

  • 5.
    Panigrahi, Smruti Ranjan
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences, Electronics. School of Electrical Engineering, KTH Royal Institute of Technology, Sweden.
    Björsell, Niclas
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences, Electronics.
    Bengtsson, Mats
    School of Electrical Engineering, KTH Royal Institute of Technology, Sweden.
    Feasibility of Large Antenna Arrays towards Low Latency Ultra Reliable Communication2017In: 2017 IEEE INTERNATIONAL CONFERENCE ON INDUSTRIAL TECHNOLOGY (ICIT), 2017, p. 1289-1294, article id 7915549Conference paper (Refereed)
    Abstract [en]

    Industrial automation and safety applications demand low latency and ultra reliable communication. Currently deployed wireless communication technologies are mostly developed for non-critical applications and hence, they are not suitable for these kind of applications. On the other hand, cable based communication is widely popular in industries, even though it has limitations towards cost of installment and is susceptible towards mechanical wear and tear. This paper reviews the feasibility of large antenna arrays at the receiver to achieve low latency and ultra reliable communication for up-link scenarios. The suitability of both coherent and non-coherent multiple input multiple output (MIMO) receivers are investigated. Non-coherent MIMO receiver is found to be a promising option as signal to noise power ratio (SNR) is fairly reasonable in achieving the desired reliability. The effect of antenna correlation at the transmitter and at receiver on reliability are also looked into. Its influence on the system performance is very nominal. Moreover, in certain scenarios, antenna correlation at the transmitter gives a significant improvement in system performance. Furthermore, having a single antenna at the sensors is found not to be a limiting factor in achieving the desired performance goal.

  • 6.
    Panigrahi, Smruti Ranjan
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences, Electronics. KTH Royal Institute of Technology, Sweden.
    Björsell, Niclas
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences, Electronics.
    Bengtsson, Mats
    KTH Royal Institute of Technology, Sweden.
    Large Antenna Array for Low-Latency and Ultra-Reliable Communication2017Conference paper (Other academic)
    Download full text (pdf)
    fulltext
  • 7.
    Panigrahi, Smruti Ranjan
    et al.
    KTH, Teknisk informationsvetenskap.
    Björsell, Niclas
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electrical Engineering, Mathematics and Science, Electronics.
    Bengtsson, Mats
    KTH, Signaler, sensorer och system.
    Multipath Radio Propagation in Industrial Indoor Environments at the 24 GHz ISM bandManuscript (preprint) (Other academic)
    Abstract [en]

    Millimeter wave (mmWave) wireless technology is one of the candidate features in fifth-generation mobile technology(5G) and has the potential to revolutionize the industrial automation and manufacturing processes. This article investigates multipath radio channel propagation in indoor industrial environments at one of the mmWave frequency bands. The wideband radio channel measurements at the 24 GHz ISM band were carried out in four different industrial environments in Sweden. The measurements were conducted using an affordable but highly competent in-house assembled mmWave testbed, reusing several radio instruments available in our lab. The measurement environments were chosen based on their radio wave reflection characteristics. The multipath propagation characteristics are analyzed with respect to the power delay profile (PDP), coherence bandwidth, and root mean square (RMS) delay spread. Additionally, the Saleh-Valenzuela model parameters are estimated for these industrial environments.

  • 8.
    Panigrahi, Smruti Ranjan
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electrical Engineering, Mathematics and Science, Electronics.
    Björsell, Niclas
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electrical Engineering, Mathematics and Science, Electronics.
    Bengtsson, Mats
    KTH.
    Path Loss at the 24 GHz ISM band for Industrial Indoor Environments2022In: IEEE International Conference on Factory Communication Systems (WFCS), 2022Conference paper (Refereed)
    Abstract [en]

    Millimeter wave (mmWave) frequency bands, ranging from 24 GHz to 100 GHz, are primarily considered for the low latency communication in fifth generation mobile technology (5G). This article investigates path loss modeling atthe 24 GHz industrial, scientific, and medical (ISM) band in indoor industrial environments. Radio channel measurements were carried out to study the narrow-band channel characteristics in three different industrial environments in Sweden. The measurements were conducted using an affordable but highly competent in-house assembled mmWave testbed, reusing several radio instruments available in our lab. A comprehensive study isperformed to investigate the path loss based on three different models.

    Download full text (pdf)
    fulltext
  • 9.
    Panigrahi, Smruti Ranjan
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electrical Engineering, Mathematics and Science, Electronics.
    Björsell, Niclas
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electrical Engineering, Mathematics and Science, Electronics.
    Bengtsson, Mats
    KTH Royal Institute of Technology.
    Power Delay Profile investigation in Industrial Indoor Environments at the 24 GHz ISM band2022In: 2022 IEEE International Conference on Industrial Technology (ICIT), IEEE , 2022Conference paper (Refereed)
    Abstract [en]

    Millimeter wave (mmWave) wireless technology is primarily considered for low latency communication in fifth-generation mobile technology (5G) and has the potential to revolutionize industrial automation and manufacturing processes. This article investigates multipath radio propagation in indoor industrial environments at the 24 GHz industrial, scientific and medical (ISM) mmWave frequency band. The wideband radio channel measurements were carried out in four different industrial environments in Sweden. The measurements were conducted using an affordable but highly competent in-house assembled mmWave testbed, reusing radio instruments available in our lab. The measurement environments were chosen based on their radio wave reflection characteristics. The multipath propagation characteristics are analyzed with respect to the power delay profile (PDP), coherence bandwidth, and root mean square (RMS) delay spread. Additionally, the Saleh-Valenzuela model parameters are estimated for these industrial environments.

  • 10.
    Panigrahi, Smruti Ranjan
    et al.
    KTH, Teknisk informationsvetenskap.
    Björsell, Niclas
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electrical Engineering, Mathematics and Science, Electronics.
    Bengtsson, Mats
    KTH, Signaler, sensorer och system.
    Radio Channel Measurement in Industrial Indoor Environments at the 24 GHz ISM band: Path loss and Channel FadingManuscript (preprint) (Other academic)
    Abstract [en]

    Millimeter wave (mmWave) frequency bands, ranging from 24 GHz to 100 GHz, are one of the candidate features of fifth generation mobile technology (5G). This article investigates the channel fading and path loss modeling in indoor industrial environments at the 24 GHz ISM band. The radio channel measurements were carried out to study the narrowband channel characteristics in three different industrial environments in Sweden. The measurements were conducted using an affordable but highly competent in-house assembled mmWavetestbed, reusing several radio instruments available in our lab. A comprehensive study is performed to investigate various radio channel propagation aspects, like the large scale fading, and the small scale fading. We examine the large scale fading with three different path loss models. The impact of the transmitter and receiver separation distance on the small scale fading is also investigated.

  • 11.
    Panigrahi, Smruti Ranjan
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electrical Engineering, Mathematics and Science, Electronics. KTH.
    Rana, Shaikh Masud
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electrical Engineering, Mathematics and Science, Electronics.
    Björsell, Niclas
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electrical Engineering, Mathematics and Science, Electronics.
    Bengtsson, Mats
    KTH.
    A study of delay and doppler spreads at 24 GHz ISM band2020In: 2020 16th International Conference on Wireless and Mobile Computing, Networking and Communications (WiMob), IEEE , 2020, p. 1-6Conference paper (Refereed)
    Abstract [en]

    This article investigates the wide-band channel characteristics at 24 GHz ISM band in a mobile radio environment. The mobility in the test environment is achieved by attaching the transmit antenna to a KUKA robot’s arm. The radio measurements were carried out inside the robotics lab at the University of Gävle, Sweden. The radio channel measurements were carried out at various situations, e.g., line of sight (LOS), non-line of sight (NLOS), regular lab environment, reflective environment, and different velocities of the robot’s arm. The influence of these situations on the power delay profile, Doppler spectral density, root mean square (RMS) delay spread, RMS Doppler spread, coherence bandwidth and coherence time, has been studied.

  • 12.
    Panigrahi, Smruti Ranjan
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electrical Engineering, Mathematics and Science, Electronics.
    Rönnow, Daniel
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electrical Engineering, Mathematics and Science, Electronics.
    Evaluating nonlinear distortion of single and dual channel excitation of an amplifier at 24 GHz2021In: Microwave and optical technology letters (Print), ISSN 0895-2477, E-ISSN 1098-2760, Vol. 63, no 9, p. 2315-2319Article in journal (Refereed)
    Abstract [en]

    Experimental characterization of an amplifier's nonlinear properties at 24 GHz is presented in single and dual-band operation using orthogonal frequency-division multiplex signals. A test system for characterizing an amplifier's nonlinear properties at millimeter-wave frequencies for single and dual-band excitation is presented. The use of standard instrument enables a feasible test system. Analytical expressions based on a statistical analysis of signals and hardware impairments were used to analyze the experimental data versus power level and found to describe well the experimental results, including inter- and cross-modulation distortion. Parameters are derived that could be used in system studies.

    Download full text (pdf)
    fulltext
1 - 12 of 12
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • harvard-cite-them-right
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • sv-SE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • de-DE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf