面向波束斜视下宽带集成感知与通信的联合收发机与组索引调制设计
Joint Transceiver and Group Index Modulation Design for Wideband Integrated Sensing and Communications Under Beam Squint
- The Hong Kong University of Science and Technology (Guangzhou)（香港科技大学（广州））
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
针对宽带集成感知与通信中的波束斜视问题，提出联合收发机波束成形与组索引调制设计，通过交替优化最大化加权最坏情况通信与感知距离，降低高信噪比下误码率并改善通信-感知权衡。
AI中文摘要：
超宽带带宽与采用频率无关移相器的大规模多输入多输出阵列相结合，会引发波束斜视，导致各子载波上出现与频率和距离相关的阵列增益变化，从而降低集成感知与通信的性能。收发机波束成形和组索引调制（GIM）能够缓解波束斜视对通信和感知性能的影响。然而，由于波束成形塑造了GIM分组和激活所依赖的子载波响应，两者的设计在频域中是耦合的。为解决这一耦合问题，我们提出了一种联合收发机波束成形与GIM设计，该设计最大化归一化最坏情况通信距离与感知距离的加权组合。一种交替优化算法联合优化收发机波束成形器和GIM配置。仿真结果表明，所提出的联合设计在高信噪比区域降低了误码率，并实现了更优的通信-感知权衡，同时保持了与所考虑的基于GIM的基准方案相当的平均感知AUC。
英文摘要：
The combination of ultra-wide bandwidth and large-scale multiple-input multiple-output arrays with frequency-independent phase shifters induces beam squint, causing frequency and distance dependent array gain variations across subcarriers and degrading integrated sensing and communications performance. Transceiver beamforming and group index modulation (GIM) can alleviate the impact of beam squint on communication and sensing performance. However, their designs are coupled in the frequency domain, as beamforming shapes the subcarrier responses on which GIM grouping and activation depend. To address this coupling, we propose a joint transceiver beamforming and GIM design that maximizes a weighted combination of normalized worst-case communication and sensing distances. An alternating optimization algorithm jointly refines the transceiver beamformers and GIM configuration. Simulation results show that the proposed joint design reduces bit error rate in the high signal-to-noise ratio region and achieves a more favorable communication-sensing trade-off, while maintaining an average sensing AUC comparable to that of the considered GIM based benchmark schemes.
