An active sequential xampling receiver for spectrum sensing is disclosed. The receiver includes a dynamically adjustable analog front end to perform sub-Nyquist energy sensing across a broad radio frequency (RF) spectrum. In an exemplary aspect, the receiver includes a dynamic modulator which modulates the broad RF spectrum to dynamically select sub-bands (e.g., RF channels) and fold their spectral content into a narrower baseband signal for energy detection. A controller adjusts the dynamic modulator to maximize utility of the spectrum detection based on past energy observations.
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