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URI permanente para esta comunidadhttp://hdl.handle.net/11349/30014
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Examinando Libros por Materia "Acceso dinámico al espectro"
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Ítem Modelo de asignación espectral multiusuario para redes de radio cognitiva descentralizadasHernández Suárez, César Augusto; Giral Ramírez, Diego Armando; Salgado Franco, Lizet CamilaThe growth of wireless applications poses new challenges to future communication systems, such as the inefficient use of the radio spectrum. Cognitive radio networks emerge as a solution to the problems of spectrum scarcity and inefficient use of the spectral resource, through dynamic access to the spectrum. These networks are characterized by perceiving, learning, planning (decision making), and acting according to current network conditions. The general objective of a cognitive radio network is for the secondary user to timely access an available frequency channel in a licensed band, without generating interference to the primary user, which can be achieved with adequate spectral decision making. The probability that two or more secondary users will choose the same channel is high, especially when the number of secondary users is greater than the number of available channels, and the more secondary users select the same channel, the lower the utility each can obtain and the number of interferences due to simultaneous access will be greater. The challenge then consists of providing the nodes of a decentralized network with the ability to learn from the environment, proposing strategies that allow secondary users to make decisions and exchange information cooperatively or competitively, in an environment of multi-user access to the spectrum. Likewise, this book seeks to resolve the question: how and to what extent can the spectral handoff rate be reduced in decentralized cognitive radio networks with a multi-user and collaborative approach?