Localization and optimization of resource allocation in a multi-user cognitive radio system

Cognitive radio intelligently adapts particular transmission or reception parameter by sensing the environment. It had taken strong consideration currently for its capability to enhance spectrum efficiency by enabling secondary users to use the spectrum resource, when it is being unused by primary user. In a multiuser cognitive radio system, the coverage region of a secondary system is divided into overlay and hybrid region. The localization of primary system and optimization of resource allocation of secondary system in a multiuser cognitive system is a difficult task. The location of primary system with respect to the secondary system is estimated by using the conventional method and then formulated a resource allocation framework to optimize the overall resource consumption by enhancing the quality of service of a primary system. Simulation result shows that the need for position statistics as a portion of resource allocation and evaluated the proposed method in terms of energy efficiency of the system.