Abstract
Compressive sampling (CS) has attracted considerable attention in
microwave and radio frequency (RF) fields in recent years. It enables the
acquisition of high-frequency signals at a rate much smaller than their
Nyquist rates. Combined with photonics technology, traditional CS systems
can significantly enlarge their operating bandwidth, which offers great
potential for spectrum sensing in cognitive radios. In this Letter, we
review our recent work on photonic CS systems for wideband spectrum
sensing. First, a proof-of-concept photonics-assisted CS system is
demonstrated; it is capable of acquiring numerous radar pulses in an
instantaneous bandwidth spanning from 500 MHz to 5 GHz with a 500-MHz
analog-to-digital converter (ADC). To further reduce the acquisition
bandwidth, multi-channel photonics-assisted CS systems are proposed for
the first time, enabling the acquisition of multi-tone signals with
frequencies up to 5 GHz by using 120-MHz ADCs. In addition, the system
bandwidth is increased from 5 to 20 GHz by employing time-interleaved
optical sampling.
© 2016 Chinese Laser Press
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