Lecture: Quasi Cyclic Short Packet

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This talk introduces a novel coded modulation scheme called Quasi-Cyclic Short Packet (QCSP) for low-power wide-area applications. Similar to the LoRa Wide Area Network, QCSP frames can be efficiently employed within an unslotted Aloha protocol. The QCSP scheme combines non-binary (NB) error-correcting codes with Cyclic Code Shift Keying (CCSK) modulation. A key advantage of QCSP frames is their ability to eliminate the need for a preamble for detection and synchronization, enabling efficient transmission of short packets even under low signal-to-noise ratio conditions. Real-time experiments have been conducted over mobile and maritime channels, and QCSP frames have also been tested in the context of Low Earth Orbit (LEO) satellite communications. To conclude, the talk highlights the differences and similarities between LoRa frames and QCSP frames, as well as ongoing research projects on this topic.


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  • Ehitajate tee 5
  • Tallinn University of Technology
  • Tallinn, Estonia
  • Estonia 12616
  • Building: main building
  • Room Number: U02-208
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  • Co-sponsored by TalTech School of IT, Thomas Johann Seebeck Department of Electronics
  • Starts 06 October 2025 09:00 PM UTC
  • Ends 18 November 2025 10:00 PM UTC
  • No Admission Charge

  Speakers

Emmanuel Boutillon

Topic:

Quasi Cyclic Short Paquets

This talk introduces a novel coded modulation scheme called Quasi-Cyclic Short Packet (QCSP) for low-power wide-area applications. Similar to the LoRa Wide Area Network, QCSP frames can be efficiently employed within an unslotted Aloha protocol. The QCSP scheme combines non-binary (NB) error-correcting codes with Cyclic Code Shift Keying (CCSK) modulation. A key advantage of QCSP frames is their ability to eliminate the need for a preamble for detection and synchronization, enabling efficient transmission of short packets even under low signal-to-noise ratio conditions. Real-time experiments have been conducted over mobile and maritime channels, and QCSP frames have also been tested in the context of Low Earth Orbit (LEO) satellite communications. To conclude, the talk highlights the differences and similarities between LoRa frames and QCSP frames, as well as ongoing research projects on this topic.

Biography:

Emmanuel Boutillon obtained is PhD degree in 1995 from the Telecom Paris Tech, Paris. From 1995 to 2000, he was an assistant professor in Telecom Paris Tech. In 1998, he spent a sabbatical year at the University of Toronto, Ontario, Canada. In 2000, he moved to the Université Bretagne Sud (Lorient, France) as a professor. He headed the LESTER lab from 2005 up to the end of 2007. He was then head of CACS department (lab-STICC) until 2016. In 2011, he had a sabbatical year at INICTEL-UNI, Lima (Peru). In 2023, he has visited EPFL for a two months period. His research interests are on the interactions between algorithm and architecture in the field of wireless communications and high speed signal processing. In particular, he works on binary and nonbinary decoders.

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Address:France