中心博士生赵阳的工作——Real-time signal acquisition based on optical excitable response by pre-designing single-tone preamble waveform（基于预设计单音前导波形产生的光学可激发响应实现信号的实时采集）的相关成果近期被Optics Letters期刊接收发表，该工作得到了国家重点研发计划（2019YFB2203700）、国家自然科学基金（T2225023）的部分资助。针对下一代通信网络的超低延迟要求，我们提出了一种超低响应时间的目标信号采集方法。该方法通过在目标信号前加入单音前导波形，单音波形扰动光注入锁定系统产生一个光学可激发脉冲，从而在模拟域定位到目标信号的起始时刻并触发ADC采集。单音波形的参数与目标信号相匹配，因此不会对收发链路带来额外的负担。通过仿真与实验验证了该方法的可行性与相关性能，结果表明在不同发射信号情况下，均可以通过调节光学可激发阈值保证前导波形可靠产生一个光学可激发脉冲，从而保证可靠的目标信号采集。最终该采集方法ns级的响应时间比传统全数字时间同步采集方法的响应时间快多个数量级，因此我们预计这项工作将有潜力成为推动实现未来6G时代超低延迟的技术之一。
摘要: Real-time acquisition of target signals is preferred for mobile communication systems. However, under the requirement of ultra-low latency for next-generation communication, traditional acquisition methods need to temporally locate the target signal from a large amount of raw data with correlation-based computing, introducing extra latency. We propose a real-time signal acquisition method based on an optical excitable response (OER) by pre-designing single-tone preamble waveform. The preamble waveform is designed to be within the amplitude and bandwidth of the target signal, so no extra transceiver is required. The OER generates a corresponding pulse to the preamble waveform in the analog domain, which simultaneously triggers an analog-to-digital converter (ADC) to acquire target signals. The dependence of OER pulse on the preamble waveform parameter is studied, leading to a pre-design of the preamble waveform for an optimal OER. In the experiment, we demonstrate a millimeter-wave (26.5-GHz) transceiver system with target signals of orthogonal frequency division multiplexing (OFDM) format. Experimental results show that the response time is less than 4 ns, which is far lower than the ms-level response time of traditional all-digital time-synchronous acquisition methods.