Lyu Zhidong, Zhang Lu, Yang Zuomin, Deng Qiuzhuo, Fang Xing, Zhang Changming, Ozolins Oskars, Pang Xiaodan, Yu Xianbin
Opt Lett. 2024 Aug 15;49(16):4493-4496. doi: 10.1364/OL.530911.
Recent advancements have brought significant attention to photonic terahertz (THz)-integrated sensing and communication (ISAC) systems. In this work, we present an adaptive frequency offset (FO) compensation method for dual-chirp-based ISAC waveforms, using the fractional Fourier transform (FrFT) method. The proposed scheme can enable frequency synchronization without a need for training preambles and exhibit robustness against system noise. We validate this approach through an experimental demonstration in a 300 GHz photonic THz-ISAC system with 20 Gbps quadrature-phase shift keying (QPSK) data transmission and 1.5 cm range resolution. The experiment successfully compensates for frequency offsets ranging from -5 to 5 GHz, achieving an estimation error of less than 0.08% and a chirp-pilot power overhead of 0.5%.
近期的进展使得光子太赫兹（THz）集成传感与通信（ISAC）系统受到了广泛关注。在这项工作中，我们提出了一种基于分数傅里叶变换（FrFT）方法的、用于双啁啾ISAC波形的自适应频率偏移（FO）补偿方法。所提出的方案无需训练前导码就能实现频率同步，并且对系统噪声具有鲁棒性。我们通过在一个具有20 Gbps正交相移键控（QPSK）数据传输和1.5 cm距离分辨率的300 GHz光子太赫兹ISAC系统中进行实验演示，验证了该方法。实验成功补偿了-5至5 GHz范围内的频率偏移，估计误差小于0.08%，啁啾导频功率开销为0.5%。
