Active Eavesdropper Mitigation via Orthogonal Channel Estimation
CoRR(2023)
Abstract
Beamforming is a powerful tool for physical layer security, as it can be used
for steering signals towards legitimate receivers and away from eavesdroppers.
An active eavesdropper, however, can interfere with the pilot phase that the
transmitter needs to acquire the channel knowledge necessary for beamforming.
By doing so, the eavesdropper can make the transmitter form beams towards the
eavesdropper rather than towards the legitimate receiver. To mitigate active
eavesdroppers, we propose VILLAIN, a novel channel estimator that uses secret
pilots. When an eavesdropper interferes with the pilot phase, VILLAIN produces
a channel estimate that is orthogonal to the eavesdropper's channel (in the
noiseless case). We prove that beamforming based on this channel estimate
delivers the highest possible signal power to the legitimate receiver without
delivering any signal power to the eavesdropper. Simulations show that VILLAIN
mitigates active eavesdroppers also in the noisy case.
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