Abstract
In this letter, a cooperative spectrum sensing scheme in the absence of dedicated reporting channels is presented. In such case, the secondary users report their decisions to the fusion center (FC) using the same channel allotted to the primary user (PU). The outage of the reported information at the FC would be affected by the presence or absence of the PU. This difference in the outage is exploited to optimize the n-out-of-K voting rule to determine the PU's state. The proposed strategy is shown to outperform strategies, which do not account for this difference in outage probabilities.
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