Secure Transmission in Cell-Free Massive MIMO under Active Eavesdropping
Yasseen Sadoon Atiya, Zahra Mobini, Hien Quoc Ngo, and Michail, Matthaiou

TL;DR
This paper investigates secure communication strategies in cell-free massive MIMO systems under active eavesdropping, proposing optimization and AP selection methods that significantly enhance secrecy spectral efficiency.
Contribution
It introduces a novel optimization framework and AP selection scheme for secure CF-mMIMO, effectively countering active eavesdropping and improving spectral efficiency.
Findings
PPZF outperforms MRT by 2x in SSE.
AP selection yields up to 220% SSE gain.
Power optimization adds up to 55% SSE improvement.
Abstract
We study secure communications in cell-free massive multiple-input multiple-output (CF-mMIMO) systems with multi-antenna access points (APs) and protective partial zero-forcing (PPZF) precoding. In particular, we consider an active eavesdropping attack, where an eavesdropper contaminates the uplink channel estimation phase by sending an identical pilot sequence with a legitimate user of interest. We formulate an optimization problem for maximizing the received signal-to-noise ratio (SINR) at the legitimate user, subject to a maximum allowable SINR at the eavesdropper and maximum transmit power at each AP, while guaranteeing specific SINR requirements on other legitimate users. The optimization problem is solved using a path-following algorithm. We also propose a large-scale-based greedy AP selection scheme to improve the secrecy spectral efficiency (SSE). Finally, we propose a simple…
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Taxonomy
TopicsWireless Communication Security Techniques · Advanced Wireless Communication Technologies · Antenna Design and Analysis
