H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 25/14 (2006.01) G06F 17/14 (2006.01) H04J 1/08 (2006.01) H04L 5/06 (2006.01)
Patent
CA 2299100
The invention is a digital channelizer and a process for dividing an input bandwidth into at least some of N channels. A digital channelizer which divides an input bandwidth into at least some of N channels in accordance with the invention includes an analog to digital converter (14) which encodes the input bandwidth into a serial digital data stream of data words; a demultiplexer (16), coupled to the analog to digital converter, which divides the serial digital data stream into M parallel data streams of data words; a window presum (102) having N outputs, coupled to the parallel data streams, each output being a function of a window presum function and data words from a plurality of the parallel data streams; a cyclic shift (24'), coupled to I output groups of data words, having I cyclic shift paths, each cyclic shift path being responsive to a different output group of data words to produce I output groups of data words which are shifted within the cyclic shift, each cyclic shift path comprising word shifting elements responsive to a group of data words with I equalling GCD(N,M) and each output group of cyclically shifted data words is repeatedly shifted through a number of cycles equal to N/GCD(N,M) with each cycle having a shift value defined by mM*modulo N, or -mM*modulo N wherein individual channels of at least some of the N channels are decimated by a decimation factor of M and m is an index variable ranging from zero upward to positive integers; and a discrete Fourier transform apparatus (26') having N inputs, coupled to the N outputs of the window presum, which performs a discrete Fourier transform on the N inputs to produce an output of at least some of the N channels.
Carrozza Dominic P.
Caso Gregory S.
Moretti Vincent C.
Gowling Lafleur Henderson Llp
Northrop Grumman Corporation
Trw Inc.
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