Conventional delay-Doppler (DD) communication and sensing systems require transmitting pilot frames at every channel coherence time interval in order to keep track of channel variations at the cost of spectral efficiency. In this paper, we propose an approach to utilize data transmissions modulated using arbitrary waveforms for DD channel estimation without requiring pilot transmissions in every coherence time interval. Numerical evaluation over practical doubly-selective channel models demonstrate $\sim 1.8 \times$ improvement in spectral efficiency with our proposed data-based approach over conventional pilot-based approaches across various 6G modulation schemes.

翻译：传统时延-多普勒（DD）通信与感知系统需要在每个信道相干时间间隔内发送导频帧以跟踪信道变化，但这会牺牲频谱效率。本文提出一种利用任意波形调制的数据传输进行DD信道估计的方法，无需在每个相干时间间隔内发送导频。在典型双选择性信道模型下的数值评估表明，针对多种6G调制方案，所提出的基于数据的方法相比传统基于导频的方法，频谱效率提升约1.8倍。