The multi-node DF cooperative communication system based on directional antennas is studied, and its interruption probability is derived by using the cooperative domain method. At the same time, it is proved that the interruption probability is optimal under the condition of opportunistic relay, and the optimal power allocation factor range is obtained through numerical simulation. The simulation results show that when multiple relays are involved, their number should be selected according to the actual scenario. Under the conditions of the same number of relay nodes and limited power, the opportunistic relay scheme can obtain a better interruption probability and a simpler power allocation method. Therefore, in the multi-relay node DF directional cooperative communication system, the opportunistic relay scheme can be used to achieve the best system performance.
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