  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 $\Omega$ impedance. Such sensitivity significantly
outperforms that of the currently deployed Long Term Evolution (LTE) system,
when normalizing the transmission bandwidth also to 1 kHz.
