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McKelvey School of Engineering

Brown School

ESE Seminar: Riku Jäntti

Thursday, May 30 | 11:00 AM - 1:00 PM

Preston M. Green Hall, Rodin Auditorium, L0120
135 N Skinker Blvd, St. Louis, MO 63112, USA

In-band Ambient Backscatter Communications in Cellular Downlink for Ambient Internet of Things

Abstract: The 3rd Generation Partnership Project (3GPP) has initiated a study on Ambient IoT (AIoT) to develop new massive Machine Type Communications (mMTC) solutions for mobile networks, aiming at devices with power consumption orders of magnitude lower than current 3GPP low-power wide area connectivity solutions. Backscatter communications have been identified as a key technology for developing battery-free AIoT communication systems. In Release 19, the AIoT backscatter work focuses on systems that use externally generated carrier waveforms to interrogate the backscatter device (BD). We propose an energy- and spectral-efficient alternative for backscattering that leverages existing downlink transmissions and user equipment channel estimator for reading backscatter device (BD) modualted messages. In our proposed scheme, the BD performs Frequency Shift Keying (FSK) modulation with relatively small frequency shifts, ensuring that the backscattered signals remain within the system bandwidth. The receiver perceives the backscatter device as an additional multipath component for the channel estimator, enabling the separation of backscatter-induced channel paths from natural multipath components in the Doppler domain. This approach enables the reading of backscatter devices without the need for any additional hardware in the network and allows backscatter devices and cellular downlink users to share spectrum. We demonstrate the feasibility of the proposed concept by showcasing its implementation in LTE downlink.

Event Type



McKelvey School of Engineering


Science & Technology

Electrical & Systems Engineering


Event Contact

Aaron Beagle | abeagle@wustl.edu

Speaker Information

Riku Jäntti

Bio: Riku Jäntti is a Full Professor in Communications Engineering at the Department of Information and Communications Engineering, Aalto University School of Electrical Engineering, Finland. He received his M.Sc (with distinction) in Electrical Engineering in 1997 and D.Sc (with distinction) in Automation and Systems Technology in 2001, both from Helsinki University of Technology (TKK). Prior to joining Aalto (formerly known as TKK) in August 2006, he was professor pro tem at the Department of Computer Science, University of Vaasa. The research interests of Prof. Jäntti include machine type communications, low-power wireless systems, cloud based radio access networks, and quantum communications.

Hosted by: Neal Patwari

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