Institute of Electrical & Electronic Engineers
Efficient decision fusion technique for cooperative spectrum sensing based on the logical OR-rule is considered for dynamic spectrum sharing between Primary Users (PUs) and Secondary Users (SUs). Due to the use of the OR-rule, the Fusion Center (FC) only needs to know if any of the local decisions was "1". Therefore, it can be a waste of resources to communicate each local decision in an orthogonal channel. To reduce the resource consumption, the authors consider that the SUs that had local decision "1" transmit simultaneously in the same channel using Continuous Wave (CW) signaling without a phase synchronization and that the FC will declare the PU is present if it detects the summed CWs.