DIGITAL CHANNELIZER HAVING EFFICIENT ARCHITECTURE FOR SELECTIVE PRESUM DISCRETE FOURIER TRANSFORM OF REAL DATA OR COMPLEX DATA AND ITS OPERATION METHOD

摘要

PROBLEM TO BE SOLVED: To provide a digital channelizer and a process which divide an input band width into at least a part of N channels. SOLUTION: A window presum part 102 which outputs real data or complex data in response to input data, a circular shift part 24' which outputs real data or complex data obtained by shifting data outputted from the window presum part, and an N-point discrete Fourier transform device 26' which executes discrete Fourier transform of inputted circularly shifted real data or complex data in response to a command to form channels are provided, and the N-point discrete Fourier transform device executes transform of inputted real data in the case of the command designating the processing of real data and executes transform of inputted complex data in the case of the command designating the processing of complex data and includes an input discrete Fourier calculation stage having two N/2-point discrete Fourier transform part and an output discrete Fourier calculation stage having N/2 two-point discrete Fourier transform parts.