基于复合可重构天线阵列的ISAC系统杂波抑制

集成感知与通信（ISAC）系统常因强杂波回波而严重受限，空间信号束处理对实际阵列尺寸往往不够。本文利用复合可重构天线（compound reconfigurable antenna, CRA）阵列来实现杂波抑制，该阵列同时可动态调整辐射模式和极化状态，从而在电磁（EM）域中大幅扩展自由度。我们构建了统一的复合信道模型，将虚拟角域响应、空间传播和极化旋转/去极化相结合。基于目标和杂波协方差的统计信息，我们构建了联合EM域和基带域的优化，以最大化雷达信号对杂波加噪声比（SCNR）。该优化还施加了多用户下行信噪比约束、总发射功率预算以及有限码本EM模式选择。 resulting nonconvex mixed-integer problem is tackled by an alternating algorithm that combines fractional programming and majorization-minimization with second-order cone programming-based updates and a penalty relaxation for mode selection. Extensive simulations in QuaDRiGa-based channel environments validate the effectiveness of the proposed CRA array design, demonstrating up to 11 dB SCNR improvements over conventional beamforming methods relying solely on baseband-domain optimization and confirming the substantial benefits of fully exploiting EM-domain reconfigurability for clutter-rich ISAC scenarios. 对于杂波丰富的ISAC场景，充分利用EM域可重构性的显著优势得到了验证。