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We clarified the relationship between the extinction ratio of upstream burst signals and Q factor of received signals to evaluate the impact of beat noise caused by residual noise interferences.
Accidents between battery-operated vehicles and pedestrians are expected to increase as electric vehicles (EV) or plug-in hybrid vehicles (PHV) are widely used in near future because of small ambient noise of EV/PHV. To prevent such accidents, a portable alert system for pedestrians to detect approaching vehicle is proposed in this paper. The alert system exploits ultra-wideband impulse radio (UWB-IR)...
An ultra-small, high-data-rate, low-power 1-cc computer (OCCC) with an UWB-IR (ultra-wideband impulse-radio) transceiver was developed for a wireless sensor network. Thanks to bear-chip implementation and a flexible printed circuit board, the size of the computer is only 1 cm3. To achieve 10-Mbps data rate, a middle-class 32-bit microcontroller, which has both a bus interface and a USB 2.0 controller,...
The first 1-cc computer (OCCC) which integrates a sensor, a wireless transceiver, a computing engine and a battery is demonstrated. Cross-layer innovation includes SPIKE control, which achieves record-low 3.4-nW/bps power with 3-ms UWB current control (one order lower than those of reported). Another proposal is communication-location integration (CLI), which achieves 22-cm location accuracy with...
A novel transmitter for ultra-wideband (UWB) impulse radio has been developed. The proposed architecture enables low-power operation, simple design, and accurate pulse-shape generation. The phase and amplitude of the pulse are controlled separately and digitally to generate a desired pulse shape. This digital control method also contributes to the low-power transmission and eliminates the need for...
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