Holographic-ELAA-Enabled Near-Field ISAC: A Sensing-Centric Beamforming Design

초록

Integrated sensing and communications (ISAC) is a promising technology for sixth-generation (6G) networks, especially when combined with extremely large-scale antenna arrays (ELAAs) for near-field sensing. In this paper, we investigate a holographic-ELAA-enabled near-field ISAC system, where a dual-functional base station simultaneously transmits communication and sensing signals. By adopting the conditional mutual information as the sensing metric, we formulate a sensing-centric beamforming optimization problem subject to a transmit power constraint and the amplitude constraints of the holographic surface. To solve the resulting problem, we decompose it into digital beamforming and holographic beamforming subproblems and propose an alternative algorithm. Numerical results show that the proposed design achieves improved sensing performance compared with conventional schemes.

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