Non-Commutative Large Entries for Cognitive Radio Applications
Cognitive radio has been proposed as a solution for the problem of underutilization of the radio spectrum. Indeed, measurements have shown that large portions of frequency bands are not efficiently assigned since large pieces of bandwidth are unused or only partially used. In the last decade, studies in different areas, such as signal processing, random matrix theory, information theory, game theory, etc., have brought one to the current state of cognitive radio research. These theoretical advancements represents a solid base for practical applications and even further developments.