Active IRS-aided NOMA with full-duplex energy harvesting wire-tapper: Performance evaluation

Wireless communication is quickly degraded due to obstacles in signal propagation. These obstacles can be remedied with intelligent reflecting surface (IRS), which purposely changes propagation conditions. However, security is a big concern in wireless communication, where active eavesdroppers are capable of energy harvesting (EH) and interfere with authorized users. This work analyzes a system model in which a full-duplex (FD) source scavenges energy from the power station and broadcasts a non-orthogonal multiple access (NOMA) signal to a close user and a distant user with the aid of active IRS (mainly reducing double loss due to double reflection) subject to a FD wire-tapper with ability of EH and interfering licensed users. By security analysis, the proposed system (active IRS-aided NOMA with FD EH wire-tapper) is demonstrated better than its counterpart (active IRS-aided orthogonal multiple access with FD EH wire-tapper).