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首页> 外文会议>2014 International Topical Meeting on Microwave Photonics and the 2014 9th Asia-Pacific Microwave Photonics Conference >Photonics-enabled sub-Nyquist radio frequency sensing based on temporal channelization and compressive sensing
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Photonics-enabled sub-Nyquist radio frequency sensing based on temporal channelization and compressive sensing

机译：基于时间信道化和压缩感测的启用光子的次奈奎斯特射频感测

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摘要

A novel approach to sensing broadband radio frequency (RF) spectrum beyond the Nyquist limit based on photonic temporal channelization and compressive sensing is proposed. A spectrally-sparse RF signal with unknown frequencies is modulated onto a highly chirped optical pulse. An optical channelizer slices the modulated pulse spectrum, which is equivalent to temporally sampling the RF waveform thanks to the dispersion-induced wavelength-to-time mapping. This serial-to-parallel conversion avoids the use of a high-speed detector and digitizer. Furthermore, compressive sensing with optical random demodulation is achieved using a spatial light modulator, enabling the system to capture the wideband multi-tone RF signal with a sampling rate far lower than the Nyquist rate. It is demonstrated that the temporal channelization system with a channel spacing of 20 GHz achieves RF spectrum sensing with a high resolution of 196 MHz. With an equivalent sampling rate of only 25 GHz, a 50-GHz broadband two-tone RF signal can be captured and reconstructed by the system thanks to compressive sensing with a compression ratio of 4.
机译：提出了一种新的基于光子时间信道化和压缩感知的奈奎斯特极限以外的宽带射频（RF）频谱感知方法。具有未知频率的频谱稀疏的RF信号被调制到高度chi的光脉冲上。光信道化器对调制的脉冲频谱进行切片，这等效于由于色散引起的波长到时间的映射而在时间上对RF波形进行采样。这种串并转换避免了使用高速检测器和数字转换器。此外，使用空间光调制器可实现具有光学随机解调的压缩感测，使系统能够以远低于奈奎斯特速率的采样率捕获宽带多音频RF信号。事实证明，具有20 GHz信道间隔的时间信道化系统可实现196 MHz的高分辨率RF频谱感测。系统的等效采样率仅为25 GHz，这归功于压缩比为4的压缩感测，系统可以捕获和重构50 GHz宽带二音RF信号。

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