Enhancing Physical Layer Security in Dual-Function Radar-Communication Systems with Hybrid Beamforming Architecture
IEEE Wireless Communications Letters(2024)
摘要
In this letter, we investigate enhancing the physical layer security (PLS)
for the dual-function radar-communication (DFRC) system with hybrid beamforming
(HBF) architecture, where the base station (BS) achieves downlink communication
and radar target detection simultaneously. We consider an eavesdropper
intercepting the information transmitted from the BS to the downlink
communication users with imperfectly known channel state information.
Additionally, the location of the radar target is also imperfectly known by the
BS. To enhance PLS in the considered DFRC system, we propose a novel HBF
architecture, which introduces a new integrated sensing and security (I2S)
symbol. The secure HBF design problem for DFRC is formulated by maximizing the
minimum legitimate user communication rate subject to radar
signal-to-interference-plus-noise ratio, eavesdropping rate, hardware and power
constraints. To solve this non-convex problem, we propose an alternating
optimization based method to jointly optimize transmit and receive beamformers.
Numerical simulation results validate the effectiveness of the proposed
algorithm and show the superiority of the proposed I2S-aided HBF architecture
for achieving DFRC and enhancing PLS.
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关键词
Dual-function radar-communication,hybrid beamforming,physical layer security
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