GHz sampling hardware implementation with sub-Nyquist coprime sampling rates

A sub-Nyquist coprime sampling system for sparse signals is implemented in this article. The proposed system is composed of coprime sampling hardware and a multicoset signal reconstruction algorithm. A pair of uniform samplers is utilized in the hardware to sample a wideband spare analog signal with...

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Bibliographic Details
Published in:Review of scientific instruments 2019-07, Vol.90 (7), p.074706-074706
Main Authors: Wen, Weifeng, Yan, Haoyue, Zhao, Yijiu, Liu, Dan, He, Hui
Format: Article
Language:English
Subjects:
Algorithms
Broadband
Circuits
Field programmable gate arrays
Hardware
Samplers
Sampling
Scientific apparatus & instruments
Signal reconstruction
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Summary:A sub-Nyquist coprime sampling system for sparse signals is implemented in this article. The proposed system is composed of coprime sampling hardware and a multicoset signal reconstruction algorithm. A pair of uniform samplers is utilized in the hardware to sample a wideband spare analog signal with an uncertain difference in start times. A time difference acquisition module embedded into a field-programmable gate array and a pulse-expanding circuit are then used to measure the difference in start times. Owing to the different frequencies of the two samplers, the coprime sample sets obtained are nonuniform. Before they are used as input to the multicoset signal reconstruction algorithm, these coprime sample sets need to be regrouped into multicoset sample sets according to the sample pattern. The results of experiments indicate that the signals can be reconstructed at an equivalent rate of the order of gigahertz from sub-Nyquist samples acquired by the designed coprime acquisition system.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.5110266