Apparatus and method for demultiplexing a frequency division multiplexed input signal and polyphase digital filter network therefor

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United States of America Patent

PATENT NO 6493358
SERIAL NO

09314221

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Abstract

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A filter network demultiplexes a frequency division multiplexed input signal which involves a reduced number of multiplier or multiplying steps. The filter network comprises L-1 Z.sup.-N shift registers in series receiving the multiplexed input signal Y(n) to produce L-1 corresponding shifted signals, pairs of which are added. The filter network further comprises a set of q multiplier sections including p first multiplier sections each being coupled to the added signals for combining each output of a corresponding set of N transformed filter coefficients g.sub.i. There are provided a set of N second adder sections each being coupled to distinct outputs of the multiplier sections for producing a corresponding set of N transformed signals, and a set of t third adders each receiving a distinct pair of signals {C.sub.T (n),C.sub.T' (n)} from the transformed signals C.sub.k (n) for producing a first filtered signal A.sub.o (n) and a set of N-1 filtered signals A.sub.k (n+k), with k=1, . . . , N-1.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
ADVANTECH SATELLITE NETWORKS INC.DORVAL QUEBEC3

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Soleymani, Mohammad Reza Beaconsfield, CA 1 4

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