Title: The Analysis and Performance of LODC-OFDM Signal in Nonlinear Rydberg Atomic Sensor Show Chinese title

Title: LODC-OFDM信号在非线性里德伯原子传感器中的分析与性能

Abstract: Rydberg atomic sensors have been seen as novel radio frequency (RF) measurements and the high sensitivity to a large range of frequencies makes it attractive for communications reception. However, the signal sensing process in Rydberg system involves sequential transduction from electromagnetic waves to optical signals and finally to electrical signals. The unipolar characteristic of the optical interface inherently restricts conventional OFDM reception. Therefore, adopting unipolar OFDM schemes, inspired by optical communication systems, becomes essential for compatible signal transmission. In this work, we investigate the amplitude modulation-to-amplitude modulation (AM-AM) characteristics of Rydberg atomic sensors, establishing an empirical approximation function. Building on the direct current-biased optical orthogonal frequency division multiplexing (DCO-OFDM) framework, we propose a novel local oscillator direct current-biased OFDM (LODC-OFDM) scheme specifically optimized for Rydberg-based sensing, effectively addressing the broadband OFDM reception challenge. Then, we adopt Bussgang theorem to analyze the nonlinear distortion of LODC-OFDM signals and the results in closed-form solutions are derived for AM/AM curves approximated by Taylor series expansion and for the ideal pre-distortion case. In real experiments, the experimental and theoretical results fit well. Show Chinese abstract

Abstract: 里德伯原子传感器被视为新颖的射频（RF）测量方法，其对大范围频率的高灵敏度使其在通信接收中具有吸引力。 然而，里德伯系统中的信号传感过程涉及从电磁波到光信号，最终到电信号的顺序转换。 光学接口的单极特性固有地限制了传统正交频分复用（OFDM）接收。 因此，采用受光学通信系统启发的单极OFDM方案对于兼容信号传输变得至关重要。 在本工作中，我们研究了里德伯原子传感器的幅度调制到幅度调制（AM-AM）特性，建立了经验近似函数。 在直接电流偏置光正交频分复用（DCO-OFDM）框架的基础上，我们提出了一种针对基于里德伯传感的新型本地振荡器直接电流偏置OFDM（LODC-OFDM）方案，有效解决了宽带OFDM接收挑战。 随后，我们采用巴斯格伦定理分析LODC-OFDM信号的非线性失真，推导出通过泰勒级数展开近似AM/AM曲线和理想预失真情况下的闭式解。 在实际实验中，实验结果与理论结果吻合良好。