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Far field radio frequency (RF) harvesting technique have become popular method to power wireless sensor network (WSN) recently. However, due to the low efficiency of RF energy harvester, RF powered WSN is unable to perform dynamic network allocation. Accordingly, the functionality of WSN is limited. This paper presents a practical RF powered wireless sensor node design that could dynamic join the...
Wireless transceivers for biomedical implants suffer from low coupling coefficients and variations due to misalignment. This paper introduces concentric helical coils for wireless power transmission in implantable devices. The transmitter coil can be implemented in any continuous circle form, such as a bracelet, an arm cuff, or a collar. It is shown that this structure produces a high coupling coefficient...
This paper proposes a highly sensitive RF-to-DC power converter with an extended dynamic range that is designed to operate at the medical band 433 MHz and simulated using 0.18 μm CMOS technology. Compared to the conventional fully cross-coupled rectifier, the proposed design offers 3.2× the dynamic range. It is also highly sensitive and requires −18 dBm of input power to produce a 1 V-output voltage...
We review two generations of smart bandages and sensors developed in our group. These devices are capable of monitoring and treating chronic wounds through O2, pH and strain measurement and on-demand drug delivery. First we seek to close the gap between patient and caregivers through continuous monitoring of wound healing status with oxygenation measurements coupled with wireless data acquisition...
This paper presents a lossless sensor data compression accelerator for power reduction in wireless body sensors. First, a low complexity compression algorithm is demonstrated for the first time on electrocardiogram (ECG) and acceleration sensor data. Second, the algorithm is implemented as a custom hardware accelerator on a health monitoring driven System on Chip (SoC) in a 130 nm process. The accelerator...
This paper compares the energy consumption used for communication in the special case of a wireless sensor network that is deployed linearly over a long distance to monitor assets such as transmission lines or pipelines. A model for energy consumption is developed based on a suitable network architecture for a linear wireless sensor network (WSN). Using the model, the energy consumption of networks...
This paper explores the use of On-chip cryptographic units for implementing security in low cost wireless sensor networks. The objective of this research is to reduce the deployment time and computational complexity of security protocols in WSNs, whilst keeping security related performance parameters at par with the current state-of-the-art. A method is proposed to continue using simple radio transreceiver...
Fall has become a serious medical problem, and sometimes leading to physical disabilities and death. This led researchers to pursue automatic monitoring systems for detecting the falls before they occur. Much of the existing efforts have successfully achieved a hardware system which provides a fall pattern after and prior to the fall. However, the existing fall detection systems are still deficient...
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