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Backscatter 1

IoT networks 1

Ultra-low-power SDR 1

backscatter instrument 1

cancellous bone evaluation 1

neonatal bone status 1

signal of interest (SOI) 1

ultrasonic backscatter 1

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An Ultrasonic Backscatter Instrument for Cancellous Bone Evaluation in Neonates Article

Chengcheng Liu,Rong Zhang,Ying Li,Feng Xu,Dean Ta,Weiqi Wang

Engineering 2015, Volume 1, Issue 3, Pages 336-343 doi: 10.15302/J-ENG-2015079

Abstract:

Ultrasonic backscatter technique has shown promise as a noninvasive cancellous bone assessment toolA novel ultrasonic backscatter bone diagnostic (UBBD) instrument and an in vivo applicationIn this study, the backscatter signal could be measured within 5 s using the UBBD.The backscatter signal was measured at a central frequency of 3.5 MHz.backscatter (FSAB), zero frequency intercept of apparent backscatter (FIAB), and spectral centroid shift

Keywords： ultrasonic backscatter cancellous bone evaluation signal of interest (SOI) backscatter instrument neonatal

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Ultra-low-power backscatter-based software-defined radio for intelligent and simplified IoT network Research Article

Huixin DONG, Wei KUANG, Fei XIAO, Lihai LIU, Feng XIANG, Wei WANG, Jianhua HE,huixin@hust.edu.cn,kuangwei@hust.edu.cn,feixiao@hust.edu.cn,isaacllh@hotmail.com,fengxiang@alumni.hust.edu.cn,weiwangw@hust.edu.cn,j.he@essex.ac.uk

Frontiers of Information Technology & Electronic Engineering 2022, Volume 23, Issue 1, Pages 19-30 doi: 10.1631/FITEE.2100321

Abstract: The recent decade has witnessed an upsurge in the demands of intelligent and simplified Internet of Things (IoT) networks that provide ultra-low-power communication for numerous miniaturized devices. Although the research community has paid great attention to wireless protocol designs for these networks, researchers are handicapped by the lack of an energy-efficient software-defined radio (SDR) platform for fast implementation and experimental evaluation. Current SDRs perform well in battery-equipped systems, but fail to support miniaturized IoT devices with stringent hardware and power constraints. This paper takes the first step toward designing an that satisfies the ultra-low-power or even battery-free requirements of intelligent and simplified . To achieve this goal, the core technique is the effective integration of μW-level in our SDR to sidestep power-hungry active radio frequency chains. We carefully develop a novel circuit design for efficient energy harvesting and power control, and devise a competent solution for eliminating the harmonic and mirror frequencies caused by hardware. We evaluate the proposed SDR using different modulation schemes, and it achieves a high data rate of 100 kb/s with power consumption less than 200 μW in the active mode and as low as 10 μW in the sleep mode. We also conduct a case study of railway inspection using our platform, achieving 1 kb/s battery-free data delivery to the monitoring unmanned aerial vehicle at a distance of 50 m in a real-world environment, and provide two case studies on smart factories and logistic distribution to explore the application of our platform.

Keywords： Backscatter Ultra-low-power SDR IoT networks