Pinching Antenna-Assisted ISAC with Waveguide Mode Selection
For ISAC system designers, this work introduces a novel spatial adaptability mechanism that improves sensing robustness under stringent communication requirements.
This paper proposes a mode-selectable pinching antenna (PA)-assisted ISAC framework that jointly optimizes waveguide mode selection, transmit beamforming, and PA positions to maximize sensing SNR under multi-user communication constraints. Numerical results show significant performance gains over traditional PA and fixed-antenna benchmarks.
Conventional pinching antenna (PA)-assisted integrated sensing and communication (ISAC) architectures typically assume static receiver locations or predetermined receive waveguides, thereby underutilizing the inherent spatial degrees of freedom. This paper proposes a novel mode-selectable PA-assisted ISAC framework to maximize the post-combining sensing signal-to-noise ratio while satisfying multi-user quality-of-service constraints by jointly optimizing the waveguide mode selection, transmit beamforming, and transmit/receive PA positions. To tackle the resulting mixed-integer nonconvex optimization problem, we develop a low-complexity block-coordinate descent algorithm that leverages a penalty-based majorization-minimization method to achieve high-quality suboptimal solutions. Numerical results demonstrate that the proposed design significantly outperforms both traditional PA and fixed-antenna benchmarks by synergistically harnessing spatial adaptability and modal reconfigurability. In particular, the mode-selectable design enables the coordinated optimization of transmit/receive operations and sensing-communication resource allocation, thereby maintaining sensing robustness under stringent communication requirements.