论文标题
弱射频信号检测基于压电 - 电动机机械系统：建筑设计和灵敏度预测
Weak Radio Frequency Signal Detection Based on Piezo-Opto-Electro-Mechanical System: Architecture Design and Sensitivity Prediction
论文作者
论文摘要
我们提出了一种基于微机电系统（MEMS）和光学相干检测模块的新型射频（RF）接收体系结构。该体系结构通过压电效应将接收的电信号转换为机械振动，并采用光学检测模块来检测机械振动。我们分析了压电膜对RF信号的响应函数，光学检测模块的噪声有限的灵敏度以及频域中的系统传输函数。最后，我们采用带宽1 kHz和载体频率1 GHz的简单开关键控（OOK）调制，以数值评估检测灵敏度。结果表明，考虑到无线通道和电路中的主要噪声源，信号检测敏感性可以达到-160 dBm左右，而50 $ω$阻抗。当将传输带宽归一化为1 kHz时，这种敏感性的表现明显优于当前部署的长期演化（LTE）系统的敏感性。
We propose a novel radio-frequency (RF) receiving architecture based on micro-electro-mechanical system (MEMS) and optical coherent detection module. The architecture converts the received electrical signal into mechanical vibration through the piezoelectric effect and adopts an optical detection module to detect the mechanical vibration. We analyze the response function of piezoelectric film to an RF signal, the noise limited sensitivity of the optical detection module and the system transfer function in the frequency domain. Finally, we adopt simple on-off keying (OOK) modulation with bandwidth 1 kHz and carrier frequency 1 GHz, to numerically evaluate the detection sensitivity. The result shows that, considering the main noise sources in wireless channel and circuits, the signal detection sensitivity can reach around -160 dBm with a 50 $Ω$ impedance. Such sensitivity significantly outperforms that of the currently deployed Long Term Evolution (LTE) system, when normalizing the transmission bandwidth also to 1 kHz.
