Abstract

MEDINA LEE, Juan Felipe; LOPEZ-PARRADO, Alexander; VERA TASAMA, Alexander  and  BOHORQUEZ PALACIO, Duvier de Jesús. Testbed for Sub-Nyquist Wideband Spectrum Monitoring. Rev. ing. univ. Medellín [online]. 2020, vol.19, n.37, pp.35-58.  Epub Sep 03, 2021. ISSN 1692-3324.  https://doi.org/10.22395/rium.v19n37a2.

Radioelectric spectrum management is a concern for today's world, mainly due to the misuse that has been given to this resource through the years, especially on the UHF band. To address this problem, a testbed for sub-Nyquist Wideband Spectrum Monitoring was built, that includes a web interface to remotely measure occupancy of the UHF band.

To achieve the above, an RF interface that allows tuning UHF frequencies with an instantaneous bandwidth of 95 MHz was built. Afterwards, a Random Demodulator was connected, and then an embedded system performed sub--Nyquist sampling and spectrum recovery. The embedded system connected to an information system that serves a web page, through which remote users can perform UHF band monitoring.

Experimental results showed that spectrum sensing can be achieved by using different algorithms on certain sparse spectra. In addition, the aforementioned web interface allowed simultaneous user connections, in order to perform independent measurements by sharing a hardware subsystem.

Keywords : Compressed sensing; sampling methods; information systems; system-on-chip; analog processing circuits; web services.

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