A subband channelizer that includes a demultiplexer that receives input
samples of a signal and distributes the input samples to a plurality of
channelizer filter banks. A Fourier transform module that receives
outputs from the plurality of channelizer filter banks and performs
Fourier transformation on each of the outputs of the channelizer filters,
and outputs a plurality of Fourier signals. A plurality of multiplier
modules that receive the Fourier signals, and each of the Fourier signals
is multiplied with an exponential value assigned to each of the plurality
of multiplier modules to produce oversampled subbands. A combiner for
generating a wideband signal from a plurality of input subbands is also
included.