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Recently, the challenges of the utilization of higher frequency bands for cellular systems have been attracting attention. In these high frequency bands, besides the higher propagation losses, the propagation channel tends to suffer more severe shadowing by pedestrians in the environments. In this paper, we carried out measurements in the 26GHz band in an indoor quasi-static environment for figuring...
The low noise block converter is one of the key nonlinear devices for spectrum sharing between IMT-A and FSS in the 3 GHz band. We measure the AM-AM characteristics of several off-the-shelf LNBs and compare the characteristics against those of conventional nonlinear device models. The comparison shows that the conventional models work well on the whole, however their accuracy has room for improvement...
We conduct field measurements to assess the effectiveness of the spectrum sharing method using adaptive transmit power control [2]. This investigation assumes a fixed satellite service as the victim and an IMT-Advanced system as the interferer. We evaluate the capacities achieved by adaptive transmit power control in a comparison with fixed-level transmit power control. The results show that adaptive...
In full-duplex multiuser multiple-input multiple-output (MU-MIMO) relaying in which a base station (BS) communicates with mobile stations (MSs) via a relay station (RS) using multiple antennas, in addition to the inter-antenna/multi- stream interference issue, the loop interference caused by simultaneously transmitting and receiving signals at the RS is also a concern. This paper proposes joint multi-filter...
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