Physical layer secrecy method for cognitive energy-carrying communication based on NOMA (Non-Orthogonal Multiple Access)

The invention discloses a physical layer secrecy method for cognitive energy-carrying communication based on NOMA (Non-Orthogonal Multiple Access). A first time slot cognitive source node collects energy of surrounding wireless energy stations in a maximum ratio merging mode; in the second time slot, the cognitive source node respectively sends the superposed signals to the cognitive destination node by adopting the NOMA technology, and at the moment, an active eavesdropping node in the wireless network not only illegally eavesdrops the signals sent by the cognitive source node, but also releases interference signals to reduce the received signal to interference plus noise ratio of the cognitive destination node; and the valid cognitive destination node and the eavesdropping node respectively calculate effective security throughput according to the received signal to interference plus noise ratio. According to the method, the problem of energy supply in cognitive communication is solved through the energy col