Jamming-Assisted Legitimate Surveillance of Suspicious Interference Networks With Successive Interference Cancellation

This letter investigates legitimate surveillance of a suspicious interference network in the presence of a full-duplex monitor. To improve the surveillance performance, jamming from the monitor is applied to interfere with the suspicious users and successive interference cancellation (SIC) decoder is equipped at the monitor to better decode signals from multiple suspicious users. To maximize the number of successfully eavesdropped suspicious users, the jamming power as well as the SIC decoding order at the monitor are optimized. By exploring the particular problem structure, high-complexity optimal and low-complexity suboptimal algorithms are proposed. It is shown that the suboptimal algorithm is practically optimal and the proposed algorithms outperform the benchmark algorithms with conventional SIC decoding order.