Patent ID: 6327603
Filing Date: 2001-12-04
Classification: H03H

Abstract:
A digital channelizer which divides an input bandwidth into at least some of N channels comprising:a window presum, responsive to input data, which outputs real or complex data;a cyclic shift, coupled to the real or complex data outputted from the window presum, which outputs real or complex data which is cyclic shifted relative to data outputted from the window presum; andan N point discrete Fourier transform apparatus, coupled to the shifted real or complex data, which in response to a command performs a discrete Fourier transform on inputted cyclic shifted real or inputted cyclic shifted complex data to produce the channels, the discrete Fourier transform apparatus performing a transformation of the inputted cyclic shifted real data when the command specifies processing of the inputted cyclic shifted real data and performing a transformation of the inputted cyclic shifted complex data when the command specifies processing of the inputted cyclic shifted complex data and whereinthe N point discrete Fourier transform includes an input discrete Fourier computation stage having two N/2 point discrete Fourier transforms having inputs coupled to outputs of the cyclic shift and a plurality of outputs and an output discrete Fourier computation stage having N/2 two point discrete Fourier transforms having a plurality of inputs coupled to outputs of different ones of the two N/2 point discrete Fourier transforms of the input discrete Fourier computation stage and a plurality of outputs which are different ones of the channels.