Cross-medium multi-carrier communication method based on millimeter-wave radar

作者：Qi Tan, Zhengyi Zhao, Ming Hu, Shuai Zhong, Yiguang Yang, Guanchu Ding, Hui Li, Hang Xu, Jie Li, Xin Ding, Jianquan Yao · 年份：2025 · DOI：10.1117/12.3056073 · 被引用次数：2 · 研究领域：Radio Wave Propagation Studies、Antenna Design and Optimization

When underwater sound waves reach the surface, they create small fluctuations at the same frequency as the sound wave vibrations, allowing for the extraction of information encoded in these waves. Frequency Modulated Continuous Wave (FMCW) millimeter-wave radar is effective for detecting these subtle surface vibrations due to its high accuracy and minimal collimation needs. However, the radar's data acquisition—via linear frequency sweep, mixing, and resolution—is time-consuming and results in a low sampling rate, limiting the capture of high-frequency signals and available bandwidth. The amplitude of surface microwave vibration caused by underwater acoustic signal is in the order of micron or nanometer, which constrains transmission rate and distance. To overcome these limitations in cross-media communication, we propose a multi-carrier communication method using millimeter-wave radar. We incorporate orthogonal frequency division multiplexing (OFDM) to allocate multiple orthogonal carriers within a limited bandwidth, utilizing On-off keying (OOK) modulation on individual carriers. This reduces the number of simultaneously active carriers and introduces a phase modulation factor to broaden pulses, lowering peak values without affecting power. Our method enhances sound pressure levels, maintains signal integrity, and extends transmission distance. Experimental validation included a linear frequency sweep with an underwater acoustic transducer to determine the optimal operating...