Relay Cooperation Covert Communication Transmission Based on Multi-Destination Nodes

Due to the openness of the wireless relay channel, the confidential information transmitted in the channel is easily eavesdropped by malicious eavesdroppers, causing information leakage. Thus, the paper constructs a wireless relay communication network model with multi-destination nodes, auxiliary relay nodes, and semi-full-duplex cooperative interference nodes to achieve covert communication transmission. Through the cooperation of the relay nodes forwarding covert information and jamming nodes interfering with eavesdroppers, the best-hidden information transmission path between the source node and the destination node is selected based on the maximum of Signal to Interference plus Noise Ratio (SINR). The Selective Combining (SC) and Maximum Ratio Combining (MRC) spatial diversity techniques are used respectively to derive the exact closed-form expressions of the outage probability (OP). Theoretical and numerical simulations show that adding the number of relay nodes, destination nodes and source power can effectively improve the reliability of the communication system.