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Cooperative selection-and-stay combining (CSSC) is analyzed for energy-efficient cooperative diversity with multiple decode-and-forward relays, where the relays are not activated all the time. To illustrate reception performance, BPSK signaling over independent and identically distributed (i.i.d.) Rayleigh fading channels is considered. The bit error rate (BER) of the end-to-end reception and average...
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...
Based on switched relays, an energy-efficient cooperative diversity scheme is addressed and its performance is analyzed. With switched relays, relying is only used when the signal-to-noise ratio (SNR) of the source-to-destination (SD) channel is lower than a preset threshold, and in addition, an activated relay will further process the received source signal only if the transmission over its source-to-relay...
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