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Compressive Spectrum Sensing for Cognitive Radio Networks. (arXiv:1802.03674v1 [cs.IT])
来源于:arXiv
A cognitive radio system has the ability to observe and learn from the
environment, adapt to the environmental conditions, and use the radio spectrum
more efficiently. It allows secondary users (SUs) to use the primary users
(PUs) channels when they are not being utilized. Cognitive radio involves three
main processes: spectrum sensing, deciding, and acting. In the spectrum sensing
process, the channel occupancy is measured with spectrum sensing techniques in
order to detect unused channels. In the deciding process, sensing results are
analyzed and decisions are made based on these results. In the acting process,
actions are made by adjusting the transmission parameters to enhance the
cognitive radio performance.
One of the main challenges of cognitive radio is the wideband spectrum
sensing. Existing spectrum sensing techniques are based on a set of
observations sampled by an ADC at the Nyquist rate. However, those techniques
can sense only one channel at a time because of the hardware 查看全文>>