DIGITAL CHANNELIZER HAVING EFFECTIVE ARCHITECTURE FOR PERIODIC SHIFTING AND OPERATION METHOD

摘要

PROBLEM TO BE SOLVED: To divide input bandwidth such as a broadband signal into at least a part of N pieces of available channels by repeatedly shifting each data word group undergoing circular shift as many as the number of specific cycles. SOLUTION: A window presum calculating part 102 is executed as plural parallel window presum circuits WP1 to WP3 and changes a circular shifting part 24' and a discrete Fourier transforming device 26' into a similar parallel architecture. The circuits WP1 to WP3 parallelly perform processing that realizes the function of the part 20. The number I of the window presum circuits is equal to a GCD (N and M), each output data word group undergoing circular shift is repeatedly shifted as many as the number of circles being equal to N/GCD (N and M), each cycle has a shift value defined by mM*modulo N or -mM*modulo N, and (m) is an index variable from zero to a positive integer.