Abstract:

In order to break the limitations of spectrum sparse to compressed sensing technology, a pilot detection scheme is proposed based on compressed sensing in non-sparse wideband spectrum sensing. Under the premise of that the interference to authorized users does not exceed the specified threshold, the scheme makes linear operation at the primary user signal as well as the pilot signal of the target band, retain the pilot component at the spectrum holes and convert the recovery of non-sparse primary user signal to the recovery of the sparse pilot signal. The scheme resolves the failure of compressed sensing technology in cognitive radio wideband spectrum sensing when the primary user signal is non-sparse. Simulations indicate that the proposed pilot testing scheme can accurately detect the position of the spectrum hole on non-sparse spectrum.

Key words: wideband spectrum sensing, compressed sensing, cognitive radio, sparsity, pilot detection