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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ATTORNEY / AGENT: (SPONSORED)

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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 QUEBEC4

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Inventor(s)

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

Cited Art Landscape

Patent Info (Count) # Cites Year
 
Other [Check patent profile for assignment information] (1)
* 6317409 Residue division multiplexing system and apparatus for discrete-time signals 30 1998
 
TAMIRAS PER PTE. LTD., LLC (1)
* 6091704 Digital multi-channel demultiplexer/multiplexer (MCD/M) architecture 14 1999
 
NEC CORPORATION (2)
* 4785447 FDM demultiplexer using oversampled digital filters 31 1988
* 6014366 Variable-bandwidth frequency division multiplex communication system 19 1997
 
ADVANTECH SATELLITE NETWORKS INC. (1)
5587939 Half-band filter for a cellular group demultiplexer 17 1996
 
FRANCE TELECOM (1)
* 5299192 Digital filter-type frequency demultiplexing device 96 1992
* Cited By Examiner

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
Other [Check patent profile for assignment information] (1)
* 8958510 Selectable bandwidth filter 0 2011
 
TAMIRAS PER PTE. LTD., LLC (2)
* 6990060 Polyphase-discrete fourier transform (DFT) sub-band definition filtering architecture 3 2001
* 2001/0036,152 Polyphase-discrete fourier transform (DFT) sub-band definition filtering architecture 2 2001
 
INTEL CORPORATION (1)
* 7245651 Dual mode filter for mobile telecommunications 9 1999
 
NORTHROP GRUMMAN SYSTEMS CORPORATION (1)
* 7095781 Polyphase filter with stack shift capability 7 1999
* Cited By Examiner