ISAC with Backscattering RFID Tags: Joint Beamforming Design
CoRR(2024)
摘要
In this paper, we explore an integrated sensing and communication (ISAC)
system with backscattering RFID tags. In this setup, an access point employs a
communication beam to serve a user while leveraging a sensing beam to detect an
RFID tag. Under the total transmit power constraint of the system, our
objective is to design sensing and communication beams by considering the tag
detection and communication requirements. First, we adopt zero-forcing to
design the beamforming vectors, followed by solving a convex optimization
problem to determine the power allocation between sensing and communication.
Then, we study a joint beamforming design problem with the goal of minimizing
the total transmit power while satisfying the tag detection and communication
requirements. To resolve this, we re-formulate the non-convex constraints into
convex second-order cone constraints. The simulation results demonstrate that,
under different communication SINR requirements, joint beamforming optimization
outperforms the zero-forcing-based method in terms of achievable detection
distance, offering a promising approach for the ISAC-backscattering systems.
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