Abstract: The spectrum sensing problem is one of the challenging issues in cognitive radio systems. In this paper, Survey for Spectrum Sensing Optimization of cognitive radio networks by joint optimization of sensing Threshold and Duration is presented. High network utilization by secondary users can be achieved with fast and reliable spectrum sensing. Maximizing Throughput for secondary users by considering both parameter variable to sensing 1.Sensing Threshold and 2.Sensing Duration. Joint optimization can be achieved by two performance criteria minimizing time for detection of spectrum hole and Joint optimization of the opportunistic throughput.

Keywords: Cognitive radio, Joint optimization, Spectrum sensing, Sensing Threshold, Sensing Duration.