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Fakultät für Elektrotechnik und Informationstechnik

PSSS system for wireless communication in industrial automation

Industriefunk Visualisierung © KT​/​TU Dortmund

Applications in industrial automation have strict requirements regarding latency and reliability of the transmission. To date, these requirements are fulfilled by wired field bus systems only. Future applications will need a higher flexibility and mobility of the communication network, e.g. for autonomous vehicles in warehouse logistics or robots within a manufacturing cell, than it is provided by wired systems. For this reason, wireless systems are gaining in popularity. They offer the required flexibility as well as easy retrofitting and a relatively low maintenance cost.

However, the requirements of industrial automation, especially factory automation, have yet to be solved by a wireless system. Therefore, future wireless systems need to adapt to the transmission properties found in industrial automation use cases.

Parallel Sequence Spread Spectrum (PSSS) is a flexible multiple access method based on nearly orthogonal codes. To encode the data symbols in parallel, cyclically shifted spreading codes with exact time synchronization are used. This enables a flexible resource allocation defined by chosen code and time slot. PSSS offers a high flexibility concerning the occupied bandwidth through choice of the code length, the allocation of resources as well as the option to quickly adapt to different SNRs through choice of the number of utilized codes. Errors within a PSSS frame are distributed equally. A fading channel therefore behaves similar to an AWGN channel. This can be beneficial when transmitting over quickly changing channels found in industrial environments.

Our work at the chair concentrates on improving the PSSS method through simulation and measurements. This includes the optimization of the PSSS parameter set and the orthogonalization of the utilized spreading sequences. Moreover, techniques for channel equalization and error correction methods adapted for PSSS’ unique characteristics are developed.

  • K. Krishnegowda, E. L. Peter, M. Scheide, L. Wimmer, R. Kays, E. Grass, R. Kraemer
    Parallel Sequence Spread Spectrum based Ultra-Reliable Low Latency Communication for Factory Automation
    26th IEEE International Conference on Emerging Technologies and Factory Automation (ETFA), Vasteras, Sweden, September 2021
  • E. L. Peter, W. Endemann, R. Kays
    Influence of Roll-off Pulse Shaping on a Parallel Sequence Spread Spectrum Signal
    19th International Conference on Industrial Informatics (INDIN), Palma de Mallorca, Spain, July 2021
  • E. L. Peter, W. Endemann, R. Kays
    Improved Parallel Sequence Spread Spectrum Transmission for High Bandwidth Efficiency
    91st Vehicular Technology Conference (VTC2020-Spring), Antwerp, Belgium, May 2020
  • E. L. Peter; R. Kays
    Bitfehlerverhalten von PSSS und OFDM im industriellen Umfeld
    10. Jahreskolloquium Kommunikation in der Automation (KommA), Magdeburg, 2019
  • W. Endemann, R. Kays, E. L. Peter
    Orthogonalization of Parallel Sequence Spread Spectrum Codes for High Order Modulation
    16th International Symposium on Wireless Communication Systems (ISWCS), Oulu, 2019
  • E. L. Peter, W. Endemann, R. Kays
    Performance of PSSS Systems in Multipath Channels
    21th International ITG Conference on Systems, Communications and Coding, Rostock, Februar 2019
  • L. Underberg, R. Kraemer, J. von Hoyningen-Huene, R. Kays
    ParSec: Ein innovatives Funksystem für die Fertigungsautomation
    at - Automatisierungstechnik, Methoden und Anwendungen der Steuerungs-, Regelungs- und Informationstechnik Journal, Januar 2019
  • R. Croonenbroeck, L. Underberg, W. Endemann, R. Kays
    Parallel Sequence Spread Spectrum: Performance Analysis in Industrial Wireless Channels
    15th International Symposium on Wireless Communication Systems (ISWCS), Lissabon, Portugal, August 2018
  • L. Underberg, R. Croonenbroeck, A. Wulf, W. Endemann, R. Kays
    A PSSS Approach for Wireless Industrial Communication Applying Iterative Symbol Detection
    IEEE Transactions on Industrial Informatics, Mai 2018
  • R. Croonenbroeck, L. Underberg, A. Wulf, R. Kays
    Measurements for the Development of an Enhanced Model for Wireless Channels in Industrial Environments
    13th IEEE International Conference on Wireless and Mobile Computing, Networking and Communications (WiMob), Rom, Italien, Oktober 2017
  • L. Underberg, R. Croonenbroeck, R. Kraemer, R. Kays
    ParSec: Wireless Industrial Communication - First PSSS Measurements in Industrial Environment
    13th IEEE International Workshop on Factory Communication Systems (WFCS), Trondheim, Norwegen, Mai 2017
  • R. Kraemer, M. Methfessel, R. Kays, L. Underberg, A.C. Wolf
    ParSec: A PSSS Approach to Industrial Radio with Very Low and Very Flexible Cycle Timing
    European Signal Processing Conference (EUSIPCO), Budapest, Ungarn, August 2016
  • L. Underberg, R. Kays, R. Kraemer, A.C. Wolf
    PSSS - Innovatives System zur Funkkommunikation für Industrie 4.0
    Proc. VDE-Kongress 2016, (2016)

Project partner

Leibniz-Institut für innovative Mikroelektronik © IHP GmbH


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