The fundamental tasks that are used in the cognitive radio (CR) networks are spectrum shaping capability and multi carrier systems. In these structures activation of fundamental (primary) users will generate a defined number of sub carriers in the second users. Therefore overall capacity of cognitive radio network is minimized. The small capacity antennas are neutralized by using OFDM based cognitive radio system although various transmit antennas are applied. This consideration examine the

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... lication of resource allocation in MIMO based cognitive radio networks. This work is used to maximize capacity of the cognitive radio transmitter and also used to maximize the power of the cognitive radio system in the downlink path for the interferences on the PU's. From the simulation results observed that the suggested algorithm in the existent paper is further increased and higher energy efficient than the previous algorithm