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Ultra wideband (UWB) communication was evaluated within a closed space, with a view to partly replacing onboard data buses with wireless connections. Spatial distributions of UWB propagation in frequency (from 3.1 to 10.6 GHz), time domains and throughput with use of a radio absorber were derived from measured. It was also found that delay spreads can be suppressed by partially panelling a radio absorber...
Ultra wideband (UWB) propagation was measured and characterized within spacecrafts, with a view to partly replacing onboard data buses with wireless connections. Spatial distributions of UWB and narrowband propagation in frequency (from 3.1 to 10.6 GHz) and time domains were measured with a microwave vector network analyzer. While narrowband resulted in a number of dead spots (deep fading points)...
This paper reviews recent advances in ultra wideband (UWB) radio propagation measurements and modeling for wireless body area networks (WBAN) under a research project between Tokyo Denki University and National Institute of Information and Communications Technology of Japan. Several measurement campaigns and associated modeling have been carried out in either a radio anechoic chamber or a specific...
Using 6.3 fs pulse laser, both spectral change in the electronic absorption spectrum and instantaneous vibrational frequency could be observed by real-time vibrational spectroscopy. Ultrafast geometrical relaxation taking place in 60-100 fs could be clarified.
This paper shows channel models on path loss and power delay profile for wireless body area networks. These models were derived from measured channel transfer functions by using a vector network analyzer. The path loss models were obtained for the frequency bands of 430, 611, 953, 2450 MHz, and UWB band. A power delay profile model was given only for the UWB band because typical symbol duration of...
Wireless body area networks (WBAN) have been discussed for medical and non-medical applications. Ultra wideband (UWB) technologies have been anticipated for use in WBAN because of their possible low power consumption and anti-multipath capabilities. Numerous literature has presented UWB propagation characterization and modeling around a human body in either a radio anechoic chamber or a particular...
With nanometer processes, at-speed testing is required to filter out failing chips with delay defects to ensure high product quality. Locating delay defects is important not only for improving yield but also providing important information to enhance at-speed test methods to meet quality goals. In this paper, a method that leverages successful static defect diagnosis method to diagnose delay defects...
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