Throughput analysis of secondary network over a medium-traffic primary network using cooperative spectrum sensing

For a cognitive radio network (CRN), there are many studies on transmission throughput of secondary users (SUs) with a fixed status for the primary user (PU) during the test period. In this paper, we consider a medium-traffic primary network, in which the PU changes its state (either idle or active) at most once during the frame time. This instability degrades the detection performance of SUs as well as their transmission throughput. We first try to find a suitable distribution for observed energy of the received primary signal by SUs in order to analyze the transmission throughput of the secondary network with added reliability. We then introduce the throughput expression of this particular CRN, and evaluate it under some required detection constraints, using cooperative spectrum sensing over imperfect reporting channels. The throughput analysis will be conducted for both single- and double-threshold schemes.