In this paper, energy detection method is used to realize local spectrum sensing [39]. The i-th Internet of Things device uses energy detection to obtain the energy value a and makes a local decision c by comparing it with the threshold b. Then the device sends the local decision to the FC through the control channel, and the FC makes the channel status based on all received reports The final decision. The test statistic f of l samples of the i-th Internet of Things device can be given by the following formula
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