Optimized beamforming for multi-user integrated sensing and communication with RFID tags in IoT networks

Abstract

In this paper, we propose a novel MIMO-enabled integrated sensing and backscatter communication (MIMO-ISABC) system to serve multiple users, and focus on the transmit beamforming design for the system. Under the total transmit power constraint, we aim to design sensing and communication beams that meet both tag detection and communication requirements. First, we use minimum mean square error (MMSE) beamforming to design the beamforming vectors, followed by convex optimization to allocate power between sensing and communication. Then, we investigate a joint beamforming optimization problem to minimize the total transmit power while meeting the tag detection and communication requirements. To solve this, we transform the non-convex constraints into convex second-order cone constraints. The experimental results demonstrate the validity and performance of the proposed scheme and associated algorithms. The proposed MIMO-ISABC system offers great potential for applications in IoT scenarios.