Performance Analysis of Adaptive Sensing in Cognitive Radio Networks with Hybrid Interweave-Underlay

In this paper we present a novel dynamic spectrum sensing and access model in cognitive radio networks. This model allows secondary user (SU) to sequentially sense two times if necessary due to the false alarm, and choose different accessing manner according to the sensing result. In practice, sensing results often affect the data transmission in cognitive radio systems. Therefore, a hybrid interweave/underlay cognitive radio system is presented by jointly considering spectrum sensing and data transmission. We derive throughput of the secondary user. compared to the existing works, our analytical results indicate that our approach can achieve significant improvements in terms of SU's throughput.