Half-band filter for a cellular group demultiplexer

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 5587939
SERIAL NO

08608940

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A half-band filter for cellular group demultiplexer has a top half and a symmetrical bottom half. Each half consists of a plurality of shift registers, adders and multipliers connected in serial arrangement so as to produce a desired result at the output whereby the number of multipliers is reduced relative to the amount of multipliers in a conventional half-band filter.

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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
Shayan, Yousef Kirkland, CA 1 17
Soleymani, Mohammad R Beaconsfield, CA 1 17

Cited Art Landscape

Patent Info (Count) # Cites Year
 
NEC CORPORATION (1)
* 4785447 FDM demultiplexer using oversampled digital filters 31 1988
 
CDC PROPRIETE INTELLECTUELLE (1)
* 5293382 Method for FDMA signal multiplexing and demultiplexing 47 1993
 
ANT NACHRICHTENTECHNIK GMBH (5)
* 4792943 Digital filter bank 15 1987
* 4953118 Nonrecursive half-band filter 11 1988
* 4896320 Filter bank for frequency demultiplexing in multiple channels 17 1988
* 4839889 Digital filter tree 67 1988
* 5177700 Non-recursive half-band filter 26 1991
 
FRANCE TELECOM (1)
* 5299192 Digital filter-type frequency demultiplexing device 96 1992
 
SONY UNITED KINGDOM LIMITED (1)
* 5268905 Sub band filters 10 1992
* Cited By Examiner

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
WI-LAN INC. (1)
* 6477207 Method and apparatus for implementing a transmission connection 10 1999
 
TAMIRAS PER PTE. LTD., LLC (5)
* 5867479 Digital multi-channel demultiplexer/multiplex (MCD/M architecture) 12 1997
* 6091704 Digital multi-channel demultiplexer/multiplexer (MCD/M) architecture 14 1999
6351451 Digital multi-channel demultiplexer/multiplexer (MCD/M) architecture 7 2000
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
 
NXP B.V. (3)
* 2008/0250,093 Method and Apparatus for Filtering Multiple Channels of Signals 1 2006
* 8626808 Digital signal processing circuit and method comprising band selection 0 2008
* 2010/0174,768 DIGITAL SIGNAL PROCESSING CIRCUIT AND METHOD COMPRISING BAND SELECTION 3 2008
 
ROBERT BOSCH GMBH (2)
* 6092093 Multiplexer device for frequency bands 2 1997
* 5926783 Switchable dividing network 2 1997
 
PANASONIC CORPORATION (2)
7616720 Multirate digital transceiver 2 2002
* 2005/0031,046 Multirate digital transceiver 3 2004
 
INTELLECTUAL VENTURES I LLC (2)
* 6876319 Integrated modulator and demodulator configuration 10 2002
* 2004/0056,785 Integrated modulator and demodulator configuration 14 2002
 
ADVANTECH SATELLITE NETWORKS INC. (1)
6493358 Apparatus and method for demultiplexing a frequency division multiplexed input signal and polyphase digital filter network therefor 4 1999
 
RIM SEMICONDUCTOR COMPANY (2)
7280469 Efficient implementation of large size FFT 2 2001
* 2002/0031,083 Efficient implementation of large size FFT 1 2001
 
SUN MICROSYSTEMS, INC. (3)
* 6256654 Signal interpolation and decimation exploiting filter symmetry 1 1996
6226662 Signal interpolation and decimation exploiting filter symmetry 0 1999
6718354 Signal interpolation and decimation exploiting filter symmetry 2 2000
 
ORACLE AMERICA, INC. (2)
* 5956666 Signal interpolation and decimation exploiting filter symmetry 1 1996
* 5892693 Signal interpolation and decimation exploiting filter symmetry 1 1996
* Cited By Examiner