Efficient Subband Channelizer for Randomly-Spaced Frequency Groups

A subband channelizer for randomly spaced frequency groups includes: a first-stage channelizer configured to channelize a wideband input into a plurality of intermediate subbands, at least two of the plurality of intermediate subbands being partially overlapped; and a plurality of second-stage channelizers each configured to generate one or more final subbands from one of the plurality of intermediate subbands, wherein the intermediate subbands have wider bandwidth than the final subbands.