Kentaro Saito

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On the air (OTA) measurement has attracted attention as a method for evaluating MIMO user equipment (UE), and represents a promising candidate for the LTE and IMT-Advanced systems. Moreover, we have to simulate spatiotemporal dynamic channel properties in the OTA measurement systems to evaluate MIMO systems with dynamic radio resource assignment. In this(More)
At present, techniques for evaluating the Multiple-Input Multiple-Output (MIMO) performance of mobile terminals in laboratories are under investigation. Employing a spatial channel emulator is one promising candidate because several characteristics of radio propagation can be emulated by using the emulator. However, detailed technical specifications for the(More)
The ray-based channel models with parameters derived from measured data such as the 3GPP Spatial Channel Model has been widely used as the standard for evaluating the performance of MIMO transmission technologies used in next generation cellular systems such as LTE and IMT-Advanced. Recently, for evaluating the temporal evolution of MIMO transmission(More)
3D-MIMO, which utilizes 2D array antennas with vertical and horizontal elements, has drawn much attention for its ability to increase the capacity of mobile communication systems. The channel properties of azimuth direction have been investigated; however these of the elevation direction have not been reported enough. We therefore investigate elevation(More)
In next-generation mobile communication systems, utilization of higher frequency bands above 10 GHz has become a hot research topic because it has the potential to improve network capacity drastically by utilizing the available wideband spectrum. However in the higher frequency bands, in addition to the higher propagation loss, diffuse scattering of(More)
OTA (Over-The-Air) performance of MIMO (Multiple-Input Multiple-Output) mobile terminals employing multi-antennas must be evaluated using the spatial channel emulator which reproduces the multi-path propagation environment around the mobile terminal. Antenna properties of an antenna correlation in addition to the branch power should be adequately evaluated(More)
The user traffic volume in the cellular network has been growing rapidly. Recent capacity enhancement techniques based on the small-cell architecture are examined for crowded areas such as urban railway stations and environs. Although small-cell propagation environments are characterized by short distances and low antenna heights, the applicability of(More)
This paper proposes novel clustering approach which utilizes scattering points obtained from the measurement-based ray tracer (MBRT). After that, multipath components (MPCs) were classified into clusters according to those scattering points. the performance of this algorithm was evaluated with 11 GHz channel sounding data in an indoor environment. The(More)
In the fifth-generation mobile communication system, the utilization of higher frequency band above 10 GHz has been widely investigated to improve the network capacity because the wide band spectrum is expected to be available. However in the higher frequency bands, in addition to the higher propagation loss, the diffuse scattering will affect the(More)
With the wide spread of broadband wireless communication devices such as wireless LAN and UWB, the wireless mesh network becomes common. As the mobile terminal's ability is getting advance in recent time, wireless mesh network is expected to support QoS for the multimedia application's traffic. The bandwidth reservation technologies that use TDMA-based MAC(More)