Relay-based spectrum sensing with wind energy harvesting

In this paper, we derive the detection probability when primary user (PU) and relay nodes harvest energy from wind using a rotor of radius r. There are three phases in the network model. In the first one, PU and relays harvest power from wind over alpha T seconds where 0 < alpha < 1 and T is frame duration. Then, PU sends its signal over (1 - alpha)T/2 seconds. In the last phase, the best relay amplifies the PU signal to a fusion node (FN) where spectrum sensing is performed using the energy detector (ED). We derive an upper bound of the detection probability and study the effects of the number of relays K, the number of symbols M used by the ED, the false alarm probability Pf and the average wind speed mu. Our results are valid for Rayleigh channels with relay selection using amplify and forward protocol. The theoretical results are confirmed with MATLAB simulations.