A number of wireless access systems have been standardized and been made available to users. However, most frequency bands suitable for mobile communication systems have been assigned, and these assignments will last for another ten years. In order to create further value, new frequency assignment techniques can be devised and be evaluated. One of solutions is to use "Cognitive Radio (CR)" or "Dynamic Spectrum Access (DS A)" technologies. These technologies are expected to be capable of increasing the exploitation of available, temporarily unused, spectrum, also on the conventional frequency band. CR and DSA will rely on sensing multi-dimensional information, on the time, frequency, and space domains, and on the exploitation of the information for spectrum selection. The control of multi-dimensional information is one of the most important aspects, in order to minimize the interference between wireless communication systems. The publication of this special section was planned with to the aim of promoting further progress of RD in this field.
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