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In directional energy transmissions, a radio frequency (RF) energy source needs to monitor each sector to achieve higher RF energy transmission efficiency. However, since the distribution of harvesting nodes can be dynamically changed in mobile environments, it is difficult to obtain the exact numbers of harvesting nodes in all sectors within limited time. In such a situation, the operations of RF...
For the wireless sensor networks, we have already proposed novel high-resolution time-of-flight (ToF) measurement principle on the basis of a vernier effect, and also confirmed its basic effectiveness experimentally. In this report, we have newly developed advanced prototype wireless sensor nodes in which proposed ToF measurement principle is installed. They provide many features, such as not only...
In order to exactly measure time delay of RF signal to travel a short distance, both high precision clock system and complex signal processing is absolutely required. This report proposes a novel methodology based on generalized vernier effect (GVE) to precisely measure RF Time-of-Flight (ToF) for wireless sensor networks (WSNs) without such complicated contraptions to realize the reliable RF ToF...
Cognitive Radio (CR) technology is one of the promising technology to efficiently utilize the unused radio spectrum. Recently, the Federal Communications Commission (FCC) allowed TV white space (TVWS) to be used for data communications provided the licensed user operations should be protected. The FCC made the rules and regulation for using the TVWS. Till now there is no real deployment of any communication...
This paper presents a novel wireless integrated power management unit (PMU) for implantable biomedical telemetry systems. The PMU was fabricated in a 0.35μm CMOS technology occupying approximately 1×1 mm2. First, the presented unit can recharge implanted batteries via radio frequency power transmitted from an RF source. The charging voltage can be set in the range of 4.28V~5.3V for various batteries...
This paper presents a supplementary system for rehabilitation, which is based on the wireless accelerometer network and integrates with remote monitoring and cross-platform intelligent terminal. System features are analyzed, and then hardware, software and different platforms are discussed and developed. Two tested cases are presented. One is for rehabilitation training of a patient with elbow ligament...
This paper proposes a synch-free RF Time-of-Flight (ToF) measurement system as an epoch-making protocol of RF ToF ranging for wireless sensor networks (WSNs). This system is based on vernier effect due to two heterogeneous clocks, which are basically adopted in order to generate new virtual time resolution much smaller than the intrinsic time resolution of two clocks of which the ratio is n:(n-1)...
Two novel, wireless, batteryless, less-invasive blood pressure sensing microsystems based on circular cuff and flat cuff configurations are developed for advanced biomedical application. Both systems employ an instrumented silicone cuff, wrapped around a blood vessel, for real-time blood pressure monitoring. The cuff is filled by silicone gel with an immersed MEMS pressure sensor and integrated electronic...
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