Dual function radar and communication (DFRC) is a promising research direction within integrated sensing and communication (ISAC), improving hardware and spectrum efficiency by merging sensing and communication (S&C) functionalities into a shared platform. However, the DFRC receiver (DFRC-R) is tasked with both uplink communication signal detection and simultaneously target-related parameter estimation from the echoes, leading to issues with mutual interference. In this letter, a projection-based scheme is proposed to equivalently transform the joint signal detection and target estimation problem into a joint signal detection process across multiple snapshots. Compared with conventional successive interference cancelation (SIC) schemes, our proposed approach achieves a higher signal-to-noise ratio (SNR), and a higher ergodic rate when the radar signal is non-negligible. Nonetheless, it introduces an ill-conditioned signal detection problem, which is addressed using a non-linear detector. By jointly processing an increased number of snapshots, the proposed scheme can achieve high S&C performance simultaneously.

中文翻译：

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解决上行链路 ISAC 接收器中的相互干扰：一种投影方法


双功能雷达和通信 （DFRC） 是集成传感和通信 （ISAC） 中一个很有前途的研究方向，通过将传感和通信 （S&C） 功能合并到一个共享平台中来提高硬件和频谱效率。然而，DFRC 接收器 （DFRC-R） 的任务是同时从回波中检测上行链路通信信号并估计目标相关参数，从而导致相互干扰问题。在这封信中，提出了一种基于投影的方案，将联合信号检测和目标估计问题等效地转化为跨多个快照的联合信号检测过程。与传统的连续干扰消除 （SIC） 方案相比，我们提出的方法在雷达信号不可忽略时实现了更高的信噪比 （SNR） 和更高的遍历率。尽管如此，它引入了一个病态信号检测问题，该问题可以使用非线性检测器来解决。通过联合处理增加的快照数量，所提出的方案可以同时实现高 S&C 性能。