Wireless Information Surveillance via Proactive Eavesdropping with Spoofing Relay
Yong Zeng, Rui Zhang

TL;DR
This paper introduces a proactive eavesdropping method using a spoofing relay with full-duplex operation and power splitting, significantly enhancing surveillance capabilities over passive methods.
Contribution
It proposes a novel proactive eavesdropping approach with optimized relay strategies and power splitting, advancing beyond existing passive and jamming schemes.
Findings
Achieves higher eavesdropping rates than passive schemes
Identifies optimal relay strategies based on channel conditions
Demonstrates significant performance improvements through numerical results
Abstract
Wireless information surveillance, by which suspicious wireless communications are closely monitored by legitimate agencies, is an integral part of national security. To enhance the information surveillance capability, we propose in this paper a new proactive eavesdropping approach via a spoofing relay, where the legitimate monitor operates in a full-duplex manner with simultaneous eavesdropping and spoofing relaying to vary the source transmission rate in favor of the eavesdropping performance. To this end, a power splitting receiver is proposed, where the signal received at each antenna of the legitimate monitor is split into two parts for information eavesdropping and spoofing relaying, respectively. We formulate an optimization problem to maximize the achievable eavesdropping rate by jointly optimizing the power splitting ratios and relay beamforming matrix at the multi-antenna…
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