AI 中文总结
本文针对动态多径信道下ISAC的正交性破坏问题，提出一种多径感知解码框架，实现了与OFDM、MIMO-OTFS相当的通信性能，同时提升了传感成像，验证了60 GHz下的多流通信与精准测距。
AI 中文摘要
双正交波形是一种多天线信号传输方案，该方案确保发射信道之间以及在规定的一组延迟偏移上保持相互正交性。通过将严格的时间正交性放宽到物理可允许的传播区域，双正交波形在为每个发射天线保留全带宽工作的同时，嵌入通信数据并维持流的可分性。这使得它们适用于集成传感与通信（ISAC）场景，在该场景中，可靠的数据传输、高分辨率传感以及成像必须在时变传播条件下共存。在动态多径环境中，多条路径带来的延迟-多普勒色散会扰动发射子空间，使放宽的正交性条件部分被破坏。本文分析了该效应，并开发了一种感知多径的解码框架，该框架基于结构化参数估计、有效子空间重构以及低复杂度线性均衡。数值结果显示，该方法的通信性能可与基于OFDM的ISAC以及MIMO-OTFS基准方案相媲美，同时通过每个发射天线的全带宽操作提升了传感与成像性能。所提方法实现了约30厘米的距离分辨率，在采用相干SAR处理时，对多径成像伪影的抑制超过15分贝，且具备良好的传感-通信权衡特性。在60 GHz下的空中实验验证了多流通信、设计的零相关区域以及精准的雷达测距。在高反射室内环境开展的第二轮实验进一步证明了在强未抑制反射下，感知多径的流均衡的有效性。
英文摘要
Dual-Orthogonality waveforms are multi-antenna signaling schemes that enforce mutual orthogonality across transmit channels and over a prescribed set of delay shifts. By relaxing strict time orthogonality to the physically admissible propagation region, they preserve full-band operation per transmit antenna while embedding communication data and maintaining stream separability. This makes them attractive for Integrated Sensing and Communications (ISAC), where reliable data transmission, high-resolution sensing, and imaging must coexist under time-varying propagation. In dynamic multipath environments, delay-Doppler dispersion across multiple paths perturbs the transmit subspaces and partially breaks the relaxed orthogonality conditions. This paper analyzes this effect and develops a multipath-aware decoding framework based on structured parameter estimation, effective-subspace reconstruction, and low-complexity linear equalization. Numerical results show communication performance comparable to OFDM-based ISAC and MIMO-OTFS baselines while improving sensing and imaging through full-band per-transmit operation. The proposed approach achieves approximately 30 cm range resolution, more than 15 dB suppression of multipath imaging artifacts with coherent SAR processing, and a favorable sensing-communication trade-off. Over-the-air experiments at 60 GHz validate multi-stream communication, the designed zero-correlation region, and accurate radar ranging. A second campaign in a highly reflective indoor environment further demonstrates multipath-aware stream equalization under strong unsuppressed reflections.
