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COGNITIVE RADIO FUSION CENTER DEVICE, SECONDARY USER DEVICE, METHOD BY WHICH COGNITIVE RADIO FUSION CENTER DEVICE DETERMINES WHETHER PRIMARY USER IS ACTIVE AND METHOD BY WHICH SECONDARY USER DEVICE REPORTS WHETHER PRIMARY USER IS ACTIVE
COGNITIVE RADIO FUSION CENTER DEVICE, SECONDARY USER DEVICE, METHOD BY WHICH COGNITIVE RADIO FUSION CENTER DEVICE DETERMINES WHETHER PRIMARY USER IS ACTIVE AND METHOD BY WHICH SECONDARY USER DEVICE REPORTS WHETHER PRIMARY USER IS ACTIVE
A cognitive radio fusion center device comprises a channel estimation unit, a sensing result reception unit and a final sensing determination unit. The channel estimation unit estimates an uplink channel characteristic for each secondary user device by using uplink sounding signals received from a plurality of secondary user devices, the sensing result reception unit simultaneously receives signals containing spectrum sensing results of the plurality of secondary user devices, and the final sensing determination unit determines whether a primary user device is active by referring to the uplink channel characteristic estimation result and the simultaneously received spectrum sensing results.
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