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1. Collaborative Channel Estimation in Backscattering Tag-to-Tag Networks

   https://doi.org/10.1145/3360773.3360882  

   Ahmad, Abeer; Athalye, Akshay; Stanacević, Milutin; Das, Samir R. (January 2019, DFHS'19: Proceedings of the 1st ACM International Workshop on Device-Free Human Sensing)
2. RF-based Analytics Generated by Tag-to-tag Networks

   https://doi.org/10.1109/ICASSP.2019.8682459  

   Stanacevic, M.; Karimi, Y.; Feng, G.; Ryoo, J.; Athalye, A.; Das, S.; Djuric, P. M. (May 2019, ICASSP 2019 - 2019 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP))
3. Amplitude and Phase Estimation of Backscatter Tag-to-Tag Channel

   https://doi.org/10.1109/ISCAS48785.2022.9937436  

   Ahmad, Abeer; Sha, Xiao; Athalye, Akshay; Das, Samir; Djuric, Petar; Stanacevic, Milutin (May 2022, 2022 IEEE International Symposium on Circuits and Systems (ISCAS))

   Large scale networks of intelligent sensors that can function without any batteries will have enormous implications in applications that range from smart spaces to structural and environmental monitoring. RF tags present an amenable platform for sensor integration as the backscatter communication offers low energy cost of communication. Current RF tags either use extremely low-power sensors or perform tasks of tag localization and identification based on the strength of the backscatter signal. We present a technique for estimation of amplitude and phase of the tag-to-tag channel that can be performed with very limited computational and energy resources. This enables monitoring of the interactions between tagged objects and activities around tags, as well as assessment of a variety of engineering structures. Experimental results demonstrate high resolution in the amplitude and phase channel measurement at a distances ranging from 22 cm to 1.34 m. 

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4. Amplitude and Phase Estimation of Backscatter Tag-to-tag Channel

   Ahmad A.; Sha X.; Athalye A., Das S.R.; Djuric P.M.; Stanacevic M. (January 2022, IEEE International Symposium on Circuits and Systems proceedings)
5. Multi-hop routing protocols for RFID systems with tag-to-tag communication

   https://doi.org/10.1109/MILCOM.2017.8170764  

   Liu, Chang; Haas, Zygmunt J. (October 2017, IEEE Military Communications Conference)

   Radio frequency identification (RFID) is a technology for automated identification of objects and people. RFID technology is expected to find extensive use in applications related to the Internet of Things, and in particular applications of Internet of Battlefield Things. Of particular interest are passive RFID tags due to a number of their salient advantages. Such tags, lacking energy sources of their own, use backscattering of the power of an RF source (a reader) to communicate. Recently, passive RFID tag-to-tag (T2T) communication has been demonstrated, via which tags can directly communicate with each other and share information. This opens the possibility of building a Network of Tags (NeTa), in which the passive tags communicate among themselves to perform data processing functions. Among possible applications of NeTa are monitoring services in hard-to-reach locations. As an essential step toward implementation of NeTa, we consider a novel multi-hop network architecture; in particular, with the proposed novel turbo backscattering operation, inter-tag distances can be significantly increased. Due to the interference among tags’ transmissions, one of the main technical challenges of implementing such the NeTa architecture is the routing protocol design. In this paper, we introduce a design of a routing protocol, which is based on a solution of a non-linear binary optimization problem. We study the performance of the proposed protocol and investigate impacts of several network factors, such as the tag density and the transmit power of the reader. 

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