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Ambient backscatter communications in future mobile networks

Abstract : How can cities, factories and homes be made both intelligent and responsive to people? To achieve this, it is possible to equip people, cities, factories and houses with radio devices to communicate messages, thanks to the Internet of things. However, permanent radio emissions result in a crippling energy expense.Ambient Backscatter Communication (AmBC) technology enables communication without the need for additional radio emission, by exploiting ambient radio waves (Wi-Fi, TV or FM broadcast, cellular, etc.). AmBC devices, named tags, backscatter the ambient electromagnetic field thanks to an antenna connected to a tunable impedance. The information is communicated to a reader by modulating the impedance of the AmBC tag. Therefore, thanks to their very low consumption, they can be powered by energy harvesting. However, the range and the data rate of these devices are still very limited.We focus this work on the study of improvements of this technology by taking advantage of the future mobile networks.Firstly, we show that the compact reconfigurableantennas can advantageously replace antenna with tunable impedance in AmBC tags. Such compact reconfigurable antennas use different radiation patterns and polarizations to make the communication more robust.Secondly, we demonstrate that existing antennas within 5G networks can be used in AmBC systems to significantly improve the data rate and the range of the AmBC tags. In a 5G scenario, the massive Multiple-Input Multiple-Output (mMIMO) antenna of the base station can be used as source of ambient waves to create hot spots and good reception spots thanks to the precoding technique. These spots aim at improving the performance of the communication from the tag to the reader. We demonstrate also that the mMIMO antenna can also be used as reader to enhance the detection of AmBC tags.Finally, we show that an emerging technology for 6G, called reconfigurable intelligent surface (RIS), which allows to partially control the wave propagation channel, can assist AmBC systems. We exploit the passive beamforming capability of the RIS technology to improve the performance of AmBC systems.
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Submitted on : Thursday, November 18, 2021 - 10:58:10 AM
Last modification on : Monday, November 22, 2021 - 8:55:34 AM


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  • HAL Id : tel-03434254, version 1


Romain Fara. Ambient backscatter communications in future mobile networks. Networking and Internet Architecture [cs.NI]. Université Paris-Saclay, 2021. English. ⟨NNT : 2021UPASG057⟩. ⟨tel-03434254⟩



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