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Due to the limited environments of radio frequency resources, the frequency assignment problem (FAP) is a crucial issue. We especially focus on the system that requires re-assignment of the frequencies often, so that the operation time is a limited resource as well as the radio resource. The FAP is closely related to the graph coloring problem, which is NP-hard problem. In this paper, we investigate...
We demonstrate a dual-polarization slot antenna for indoor small-cell multiple-input–multiple-output (MIMO) systems. The symmetric structure and differential feeding promotes destructive interference of cross-polarized radiation in the far field to achieve high cross-polarization discrimination (XPD) in all directions. In addition, a very similar radiation pattern is observed not only between the...
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