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135 N Skinker Blvd, St. Louis, MO 63112, USA
#SeminarIn-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.
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