Throughput optimization of double-threshold based improved energy detection in cooperative sensing over imperfect reporting channels

Abstract

Cognitive radio (CR) has been proposed as a promising solution to overcome the spectrum scarcity problem. Many works have been reported to improve spectrum sensing performance of secondary users (SUs) as an essential step to design a CR network (CRN). Spectrum sensing optimization is able to improve spectral efficiency and protect a primary user (PU) from interference. Among different detection techniques, energy detection (ED) has been investigated widely as it is an efficient detection method, especially in the case of a CRN, in which SUs have no prior information of the primary signal most of the time. Transmission throughput of a secondary network is one of the performance criteria in a CRN. In this paper, we analyze the throughput performance of different ED schemes such as improved ED (IED) and double-threshold based IED, with several detection constraints, in both cases of perfect and imperfect reporting channels. The double-threshold based IED scheme is found to achieve the highest achievable throughput over imperfect reporting channels as compared with other ED methods.