As microcell wireless systems become more widespread, intercell interference among the access points will increase due to the limited frequency resource. In the overlapping cell scenario, radio resources should be shared by multiple cells. Although time and frequency resource sharing has been described in many papers, there is no detailed report on dynamic spatial resource sharing among multiple cells for microcell wireless systems. Thus, we present the effectiveness of spatial resource sharing among two access points. We introduce two scenarios based on the zero forcing method; one is the primary-secondary AP scenario and the other is the cooperative AP scenario. To evaluate the transmission performance of spatial resource sharing, channel matrices are measured in an indoor environment. The simulation results using the measured channel matrices show the potential of spatial resource sharing.
The deformation of the surface of epoxy resin plates with an embedded linear shape-memory alloy (SMA) wire as an actuator in smart structure members is measured as a function of the duration of the supply of electric current to the SMA wire, using a digital image correlation technique. Results show that the two-dimensional deformation of the plate surface can be measured, and that the maximum deformation of the plate surface can be obtained on both sides of a crack and increases with the duration of the current supply. Therefore, the deformation of the plate surface measured using the digital image correlation technique suggests the possibility of its application in the prediction of crack closure in epoxy resin plates with embedded SMA wires heated by supplying electric current.
hi Japan, with the start of the Personal Handy Phone System (PHS)1 service in 1995, there has been increased activity aimed at developing on mobile-multimedia communication services that take advantage of the system's high 32-kbps speed. Since wireless transmission paths suffer from fading errors, an important task in the implementation of mobilemultimedia communication services will be to guarantee high-efficiency communication despite the error-laden transmission channel. We present a study ofa highly error-tolerant re-transmission-control method.
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