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To save the power and time of total relay processing and to achieve a higher bandwidth efficiency in relay usage, a simple multi-relay switching scheme is proposed and analyzed for cooperative spectrum sensing, where energy detection is employed for the detection of a spectrum hole. In the cooperative spectrum sensing with relay switching, not all available relays are activated and used at all time...
Two schemes of energy-efficient cooperative spectrum sensing with relay switching over Rayleigh fading channels are proposed and analyzed for cognitive radio (CR). With relay switching, to save the power and transmission resource of the relays, not all available relays are activated all the time. In the first scheme, when relaying is activated, a switch-and-test (SWT) policy based on the energy received...
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