It overcomes interference from the body surface, and localizes the in-body backscatter devices even though the signal travels along crooked paths. We have implemented our design and evaluated it in animal tissues and human phantoms. Our results demonstrate that ReMix delivers efficient communication at an average SNR of 15.2 dB at 1 MHz bandwidth, and has an average localization accuracy of 1.4cm in animal tissues.

October 2, 2023 - Recent work has focused on leveraging near field magnetism-based systems to avoid the challenges of attenuation, refraction, and reflection experienced by radio waves. However, these systems suffer from limited range, and require fingerprinting-based localization techniques. We present InnerCompass, a magnetic backscatter system for in-body communication and localization.

August 7, 2018 - This paper investigates concurrent localization and ambient radio frequency (RF) energy harvesting using backscatter communication systems for Internet of Things networks. Dynamic real-world environments introduce complexity from multipath reflection and shadowing, as well as interference from movements. A machine learning framework leveraging K-Nearest Neighbors and Random Forest classifiers creates robustness against such variability. Historically, received signal measurements construct a location fingerprint database resilient to perturbations.

October 6, 2023 - InnerCompass uses small tags and small out-of-body coils. It · uses low-power magnetic backscatter for both communica- tion and localization.

August 20, 2018 - body twice, they lose more than 20dB just to get 5cm deep. This · amount is important as we start accumulating the various losses · that eventually lead to about 80dB of surface to backscatter ... Fig. 2(b) plots α for different materials inside the human tissues, i.e. muscle, fat and skin. It shows that the phase changes 8 · times faster in muscle than air. This property is useful for RF- based localization algorithms that leverage phase changes to

October 2, 2023 - It overcomes interference from the body surface, and localizes the in-body backscatter devices even though the signal travels along crooked paths. We have implemented our design and evaluated it in animal tissues and human phantoms. Our results demonstrate that ReMix delivers efficient communication at an average SNR of 15.2 dB at 1 MHz bandwidth, and has an average localization accuracy of 1.4cm in animal tissues.

January 2, 2020 - Some proposals for in-body RF-based localization have used the received signal strength (RSS) [34, 33]. Those systems use an array of receive antennas and either assume the implant to be closest to the receive antenna with the highest power or use path loss models to estimate location [31]. Analysis of the error bounds on RSS in-body localization has reported lower bounds of 4 to 6 cm [34] even when using up to 50 receive antennas. Past work has also tried to adapt indoor localization based on time-of-flight (ToF) or angle of arrival (AoA) for the domain [32, 22, 5]. Unfortunately, these syste

The design overcomes interference from the body surface, and localizes the in-body backscatter devices even though the signal travels along crooked paths, demonstrating that ReMix delivers efficient communication at an average SNR of 15.2 dB ...

body twice, they lose more than 20dB just to get 5cm deep. This · amount is important as we start accumulating the various losses · that eventually lead to about 80dB of surface to backscatter ... Fig. 2(b) plots α for different materials inside the human tissues, i.e. muscle, fat and skin. It shows that the phase changes 8 · times faster in muscle than air. This property is useful for RF- based localization algorithms that leverage phase changes to

It overcomes interference from the body surface, and localizes the in-body backscatter devices even though the signal travels along crooked paths. We have implemented our design and evaluated it in animal tissues and human phantoms. Our results demonstrate that ReMix delivers efficient communication at an average SNR of 15.2 dB at 1 MHz bandwidth, and has an average localization accuracy of 1.4cm in animal tissues.

• Backscatter is one of the most power-efficient communication · technologies and can be used for localization. Attenuation Increase Exponentially · • Surface Interference – A large · portion of the signal is reflected · as soon as it hits a human’s · surface due to the large · difference in electrical · properties. • Signal Deflection – RF signals · propagate slower in the human · body and doesn’t travel in a ·

A backscatter approach is particularly customized for deep tissue devices, which do not require active signal transmission for localization of or data communication from the devices. The design overcomes interference from the body surface, and localizes the in-body backscatter devices even though the signal travels along non-straight paths.

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In addition, communication through the human body has been implemented in simplex mode or half duplex mode, leveraging the unilateral path loss between two battery-powered active devices [4], [5]. This creates a significant challenge in realizing realistic batteryless body sensor networks while simultaneously supporting power transfer and body-centric capacitive radio communication, which have yet to be studied among passive devices. In this work, we investigate a new intra-body identification (IBID) [6] technology that combines the key technical features of C-IBPT and RF backscatter [7]. Similar to C-IBPT [1], IBID takes advantage of skin conductivity and air coupling capacitance to form the communication loop between a pair of skin-coupled electrodes.

August 22, 2023 - Artifacts for Mobicom 2023 paper "Magnetic Backscatter for In-body Communication and Localization" 180 · Views · 23 · Downloads · Show more details · More info on how stats are collected.... Indexed in · OpenAIRE · DOI · DOI Badge · [](https://doi.org/10.5281/zenodo.8270142) ..

presents the history background of backscatter radio or com- munication; Section III exposes some different combinations · in backscatter communication: backscatter communication

of static nature and thus does not fit an in-body scenario. The · second approach [23] attempted to localize software-defined · metamaterial (SDM) elements by utilizing THz backscatter- ing communication for frequencies of 300 GHz to 10 THz.

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