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Gigabit wireless access in the millimeter-wave band is very essential to the successful realization of 5th generation (5G) cellular network. Two kinds of systems have been developed: a mesh network composed of the 40 GHz-band Fixed Wireless Access system can be applied to realize the outdoor backhauls and fronthauls; on the other hand, a 60 GHz-band short-range wireless access system can be applied...
Latest success of open experiments of mmWave systems and networks for the Heterogeneous network in 5G Mobile Communication are reviewed. This is conducted in “wireless-fiber project” funded by the Ministry of Internal Affairs and Communications, Japan and high-speed wireless communication systems above Gb/s has been pursued by the collaborative team in Tokyo Institute of Technology as well as the...
The vertical profile of atmospheric carbon dioxide is one of the most significant parameters for carbon cycle study. Ground-based differential absorption lidar (DIAL) is widely accepted as the most compromising technique to obtain vertical profile of atmospheric CO2. A container-integrated prototype was demonstrated in this paper. Both the configuration and preliminary results were presented here...
A compact-range wireless access system in the 60 GHz-band has been proposed for multi-Gb/s data transfer. Large array antennas adopting in the transmitter operate in their near-field regions, and provide us with a large communication zone and a pure propagation environment. However, intersymbol interference (ISI) may significantly degrade the system performance especially when the receiver is close...
A compact range wireless access system in the 60 GHz-band has been proposed for multi-Gb/s data transfer. A prototype GATE (Gigabit Access Transponder Equipment) was made to evaluate the coverage as well as the system performance of received power, bit-error rate (BER) and signal-to-noise ratio. Originally, the double-layer corporate-feed waveguide slot arrays with different number of elements were...
A novel compact-range gigabit wireless access system in the 60 GHz band is proposed for burst-type data transfer. A large array antenna adopted in the access point forms a stable communication zone proportional to the antenna size. The mobile user standing everywhere within the coverage, receives a stable signal almost free of multi-path. The circularly-polarized waveguide slot arrays with different...
A novel concept of short range communication is proposed for millimetre-wave high speed file transfer. A very high gain antenna generates a quasi-plane wave and synthesises a coverage up to 10m with uniform illumination in near field region of the aperture, in analogy to a compact range. Apart from conventional short range communication systems with the level diagram still following Friis's equation...
A novel concept of short range wireless access system is proposed for multi-Gb/s data transfer in the 60 GHz band. An extremely large array antenna (64×64 elements) generates a quasi-plane wave and forms communication zone proportional to the antenna size. The key is that the stable signal coverage up to 10 m with uniform illumination still stays in the Fresnel region of the array antenna. The link...
Recently, a cloud computing system is widely expected to realize a free and high-capacity data transfer between the high-performance mobile wireless terminals and the servers. The highspeed multi-Gbps short range wireless access gate system in millimeter-wave band is under development in Japan. Figure 1 illustrates the wireless access gate to be established in stations and other public areas. Many...
In this work, a schematic model of single-walled silicon nanotube (SWSiNT) devices is presented aimed at advancing the understanding of nano-electronic field. The circuit model of one-dimensional SWSiNT devices is firstly proposed. The cutoff frequency of SWSiNT devices is obtained, opening up the possibility of a THz silicon nanotube transistor.
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