Xampling: analog to digital at sub-Nyquist rates
Xampling: analog to digital at sub-Nyquist rates
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DOI：
10.1049/iet-cds.2010.0147
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发表时间：
2011-01-01
影响因子：
1.3
通讯作者：
Shoshan, E.
中科院分区：
文献类型：
--
作者：
Mishali, M.;Eldar, Y. C.;Shoshan, E.
作者提出了一种宽带输入的亚奈奎斯特模数转换器。该电路实现了最近提出的调制宽带转换器，这是一个灵活的平台，根据他们的实际带宽占用采样信号。例如，理论工作使得能够实现亚奈奎斯特宽带通信接收器，其不具有关于发射器载波位置的先验信息。本设计支持具有2 GHz奈奎斯特速率和120 MHz频谱占用的输入信号，具有任意传输频率。采样率低至280 MHz。据作者所知，这是第一个报告的硬件，执行子奈奎斯特采样和宽带信号的重建。作者描述了各种电路设计考虑因素，重点介绍了转换器引入的非常规挑战：将信号与多组正弦波（而不是单个本机振荡器）混频，以及生成高瞬态周期波形，瞬态间隔为奈奎斯特速率量级。硬件实验验证了设计的有效性，并演示了欠采样和信号重构。
The authors present a sub-Nyquist analog-to-digital converter of wideband inputs. The circuit realises the recently proposed modulated wideband converter, which is a flexible platform for sampling signals according to their actual bandwidth occupation. The theoretical work enables, for example, a sub-Nyquist wideband communication receiver, which has no prior information on the transmitter carrier positions. The present design supports input signals with 2 GHz Nyquist rate and 120 MHz spectrum occupancy, with arbitrary transmission frequencies. The sampling rate is as low as 280 MHz. To the best of the authors' knowledge, this is the first reported hardware that performs sub-Nyquist sampling and reconstruction of wideband signals. The authors describe the various circuit design considerations, with an emphasis on the non-ordinary challenges the converter introduces: mixing a signal with a multiple set of sinusoids, rather than a single local oscillator, and generation of highly transient periodic waveforms, with transient intervals on the order of the Nyquist rate. Hardware experiments validate the design and demonstrate sub-Nyquist sampling and signal reconstruction.