Joint optimization of detection threshold and throughput in multiband cognitive radio systems

In cognitive radio (CR) systems, efficient spectrum sensing ensures secondary users (SUs) to successfully access the spectrum hole. Typically, the detection problem has been studied separately from the optimization of throughput of secondary network. However, due to non-zero probabilities of miss detection and false alarm, the sensing phase has an impact on the throughput of CR networks as well as on the transmission of primary users (PUs). In this paper, using energy detection, we maximize the total throughput of all SUs by jointly optimizing the detection threshold and resource allocation in multiband CR systems. Efficient algorithms including online and offline solutions are proposed to solve the proposed mix-integer programming problem, which show better performance compared with traditional uniform detection threshold selection algorithm.