WO2004036811A3 - Method and apparatus for interference suppression with efficient matrix inversion in a ds-cdma system - Google Patents

Method and apparatus for interference suppression with efficient matrix inversion in a ds-cdma system Download PDF

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Publication number
WO2004036811A3
WO2004036811A3 PCT/US2003/032830 US0332830W WO2004036811A3 WO 2004036811 A3 WO2004036811 A3 WO 2004036811A3 US 0332830 W US0332830 W US 0332830W WO 2004036811 A3 WO2004036811 A3 WO 2004036811A3
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WO
WIPO (PCT)
Prior art keywords
present
cdma system
interference suppression
matrix inversion
cancellation
Prior art date
Application number
PCT/US2003/032830
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French (fr)
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WO2004036811A2 (en
WO2004036811A9 (en
Inventor
Eric S Olson
Anand P Narayan
Prashant Jain
John K Thomas
Original Assignee
Tensorcomm Inc
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Filing date
Publication date
Application filed by Tensorcomm Inc filed Critical Tensorcomm Inc
Priority to AU2003301493A priority Critical patent/AU2003301493A1/en
Publication of WO2004036811A2 publication Critical patent/WO2004036811A2/en
Publication of WO2004036811A9 publication Critical patent/WO2004036811A9/en
Publication of WO2004036811A3 publication Critical patent/WO2004036811A3/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7097—Interference-related aspects
    • H04B1/7103—Interference-related aspects the interference being multiple access interference
    • H04B1/7105—Joint detection techniques, e.g. linear detectors
    • H04B1/71052—Joint detection techniques, e.g. linear detectors using decorrelation matrix
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7097—Interference-related aspects
    • H04B1/7103—Interference-related aspects the interference being multiple access interference
    • H04B1/7107—Subtractive interference cancellation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7097—Interference-related aspects
    • H04B1/711—Interference-related aspects the interference being multi-path interference
    • H04B1/7115—Constructive combining of multi-path signals, i.e. RAKE receivers
    • H04B1/7117—Selection, re-selection, allocation or re-allocation of paths to fingers, e.g. timing offset control of allocated fingers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7097—Interference-related aspects
    • H04B1/711—Interference-related aspects the interference being multi-path interference
    • H04B1/7115—Constructive combining of multi-path signals, i.e. RAKE receivers
    • H04B1/712—Weighting of fingers for combining, e.g. amplitude control or phase rotation using an inner loop

Abstract

The present invention is directed to signal cancellation in spread spectrum communication systems (100). In particular, the present invention provides method and apparatus (120, 128 and 132) for selectively canceling interfering signals, even where symbols to be canceled do not align with symbols associated with a desired signal path. Furthermore, the interference cancellation provided by embodiments of the present invention is capable of functioning to remove interference associated with channels utilizing a symbol length that is different than the symbol length of a desired signal path. In accordance with a further embodiment of the present invention, method and apparatus for efficiently calculating projections to enable signal cancellation are provided.
PCT/US2003/032830 2002-10-15 2003-10-15 Method and apparatus for interference suppression with efficient matrix inversion in a ds-cdma system WO2004036811A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003301493A AU2003301493A1 (en) 2002-10-15 2003-10-15 Method and apparatus for interference suppression with efficient matrix inversion in a ds-cdma system

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US41818702P 2002-10-15 2002-10-15
US41818102P 2002-10-15 2002-10-15
US60/418,181 2002-10-15
US60/418,187 2002-10-15

Publications (3)

Publication Number Publication Date
WO2004036811A2 WO2004036811A2 (en) 2004-04-29
WO2004036811A9 WO2004036811A9 (en) 2004-06-17
WO2004036811A3 true WO2004036811A3 (en) 2004-08-05

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PCT/US2003/032830 WO2004036811A2 (en) 2002-10-15 2003-10-15 Method and apparatus for interference suppression with efficient matrix inversion in a ds-cdma system

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US (1) US7430253B2 (en)
AU (1) AU2003301493A1 (en)
WO (1) WO2004036811A2 (en)

Families Citing this family (43)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7260506B2 (en) * 2001-11-19 2007-08-21 Tensorcomm, Inc. Orthogonalization and directional filtering
US7787572B2 (en) 2005-04-07 2010-08-31 Rambus Inc. Advanced signal processors for interference cancellation in baseband receivers
US7876810B2 (en) 2005-04-07 2011-01-25 Rambus Inc. Soft weighted interference cancellation for CDMA systems
US8761321B2 (en) 2005-04-07 2014-06-24 Iii Holdings 1, Llc Optimal feedback weighting for soft-decision cancellers
US20050180364A1 (en) * 2002-09-20 2005-08-18 Vijay Nagarajan Construction of projection operators for interference cancellation
US7808937B2 (en) 2005-04-07 2010-10-05 Rambus, Inc. Variable interference cancellation technology for CDMA systems
US8179946B2 (en) 2003-09-23 2012-05-15 Rambus Inc. Systems and methods for control of advanced receivers
US7042857B2 (en) 2002-10-29 2006-05-09 Qualcom, Incorporated Uplink pilot and signaling transmission in wireless communication systems
US7177297B2 (en) * 2003-05-12 2007-02-13 Qualcomm Incorporated Fast frequency hopping with a code division multiplexed pilot in an OFDMA system
US7738534B2 (en) 2003-11-24 2010-06-15 Telefonaktiebolaget Lm Ericsson (Publ) Multi-transmitter interference suppression using code-specific combining
US8611283B2 (en) 2004-01-28 2013-12-17 Qualcomm Incorporated Method and apparatus of using a single channel to provide acknowledgement and assignment messages
US8891349B2 (en) 2004-07-23 2014-11-18 Qualcomm Incorporated Method of optimizing portions of a frame
US8238923B2 (en) 2004-12-22 2012-08-07 Qualcomm Incorporated Method of using shared resources in a communication system
US8831115B2 (en) 2004-12-22 2014-09-09 Qualcomm Incorporated MC-CDMA multiplexing in an orthogonal uplink
US7453849B2 (en) * 2004-12-22 2008-11-18 Qualcomm Incorporated Method of implicit deassignment of resources
WO2006093723A2 (en) 2005-02-25 2006-09-08 Data Fusion Corporation Mitigating interference in a signal
US20070036202A1 (en) * 2005-03-11 2007-02-15 Hongya Ge Code, signal and conjugate direction design for rapidly-adaptive communication receivers and electromagnetic, acoustic and nuclear array processors
US7826516B2 (en) 2005-11-15 2010-11-02 Rambus Inc. Iterative interference canceller for wireless multiple-access systems with multiple receive antennas
US20060256747A1 (en) * 2005-05-16 2006-11-16 Mikko Jaakkola Terminal assisted WLAN access point rate adaptation
JP2007324754A (en) * 2006-05-30 2007-12-13 Ntt Docomo Inc Signal receiving section detector
US7616696B1 (en) * 2006-06-14 2009-11-10 Nextel Communications, Inc. System and method to increase sector throughput in a multi-carrier operation
US7787885B1 (en) * 2006-08-10 2010-08-31 Nextel Communications Inc. Walsh code expansion in wireless communications systems
US7877097B2 (en) * 2006-11-06 2011-01-25 Fujitsu Limited Reuse pattern network scheduling using interference levels
US7643429B2 (en) * 2006-11-06 2010-01-05 Fujitsu Limited Interference measuring and mapping method and apparatus for wireless networks using relay stations
US7751463B2 (en) 2006-12-05 2010-07-06 Telefonaktiebolaget Lm Ericsson (Publ) Method and apparatus for suppressing interference based on channelization code power estimation with bias removal
US20080171551A1 (en) * 2007-01-11 2008-07-17 Fujitsu Limited Reuse pattern network scheduling using load levels
JP4836829B2 (en) * 2007-02-26 2011-12-14 富士通株式会社 Receiving device, path detecting device, method and computer program used in CDMA base station
US7894774B2 (en) * 2007-08-02 2011-02-22 Wireless Technology Solutions Llc Communication unit and method for interference mitigation
US7995641B2 (en) 2007-11-06 2011-08-09 Telefonaktiebolaget Lm Ericsson (Publ) Method and apparatus for code power parameter estimation for received signal processing
US9225386B2 (en) * 2007-11-20 2015-12-29 Sony Corporation Method for placement of fingers with G-Rake advanced receiver
US20090161655A1 (en) * 2007-12-20 2009-06-25 Qualcomm, Incorporated Umb cell site modem architecture and methods
US8412093B2 (en) * 2008-10-22 2013-04-02 Mediatek Inc. Receiver applying channel selection filter for receiving satellite signal and receiving method thereof
US8311484B2 (en) * 2009-09-15 2012-11-13 Broadcom Corporation Method and system for interference suppression using information from non-listened base stations
US9215012B2 (en) 2012-04-26 2015-12-15 Propagation Research Associates, Inc. Method and system for using orthogonal space projections to mitigate interference
US9401741B2 (en) 2012-04-26 2016-07-26 Propagation Research Associates, Inc. Methods and systems for mitigating signal interference
TWI475835B (en) * 2012-09-28 2015-03-01 Raydium Semiconductor Corp Orthogonal code matrix generation method and orthogonal code matrix generation circuit
GB2533539A (en) * 2013-10-02 2016-06-22 Terabit Radios Inc High throughput interference cancelling radio transceiver and antenna therefor
US10571224B2 (en) 2015-05-04 2020-02-25 Propagation Research Associates, Inc. Systems, methods and computer-readable media for improving platform guidance or navigation using uniquely coded signals
US9712355B1 (en) * 2016-01-11 2017-07-18 Qualcomm Incorporated Spreading techniques for frequency-shift keying modulation
WO2017201467A1 (en) * 2016-05-20 2017-11-23 Cohere Technologies Iterative channel estimation and equalization with superimposed reference signals
US10996326B2 (en) * 2018-11-13 2021-05-04 GM Global Technology Operations LLC Generation of a family of orthogonal signals for a CDMA radar system
US11651131B2 (en) * 2020-06-26 2023-05-16 Synopsys, Inc. Glitch source identification and ranking
US11018705B1 (en) 2020-07-17 2021-05-25 Propagation Research Associates, Inc. Interference mitigation, target detection, location and measurement using separable waveforms transmitted from spatially separated antennas

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6175587B1 (en) * 1997-12-30 2001-01-16 Motorola, Inc. Communication device and method for interference suppression in a DS-CDMA system
US6285861B1 (en) * 1999-06-14 2001-09-04 Qualcomm Incorporated Receiving station with interference signal suppression

Family Cites Families (116)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3742201A (en) * 1971-02-22 1973-06-26 Raytheon Co Transformer system for orthogonal digital waveforms
US4359738A (en) 1974-11-25 1982-11-16 The United States Of America As Represented By The Secretary Of The Navy Clutter and multipath suppressing sidelobe canceller antenna system
US4088955A (en) * 1975-04-07 1978-05-09 Baghdady Elie J Interference rejection technique
US4713794A (en) 1978-12-22 1987-12-15 Raytheon Company Digital memory system
US4309769A (en) * 1980-02-25 1982-01-05 Harris Corporation Method and apparatus for processing spread spectrum signals
US4665401A (en) * 1980-10-10 1987-05-12 Sperry Corporation Millimeter wave length guidance system
IL67379A (en) 1982-12-01 1985-11-29 Tadiran Israel Elect Ind Ltd Real-time frequency management system for hf communication networks
US4601046A (en) * 1984-05-15 1986-07-15 Halpern Peter H System for transmitting data through a troposcatter medium
US4670885A (en) * 1985-02-26 1987-06-02 Signatron, Inc. Spread spectrum adaptive antenna interference canceller
US4893316A (en) * 1985-04-04 1990-01-09 Motorola, Inc. Digital radio frequency receiver
US4965732A (en) 1985-11-06 1990-10-23 The Board Of Trustees Of The Leland Stanford Junior University Methods and arrangements for signal reception and parameter estimation
DE3687748T2 (en) * 1985-12-26 1993-05-27 Matsushita Electric Ind Co Ltd TRANSMISSION METHOD OF A DIGITAL SIGNAL WITH IMPROVED ERROR RATE PROPERTIES FOR MULTIPLE-WAY TRANSMISSION.
US4922506A (en) * 1988-01-11 1990-05-01 Sicom Corporation Compensating for distortion in a communication channel
US4933639A (en) * 1989-02-13 1990-06-12 The Board Of Regents, The University Of Texas System Axis translator for magnetic resonance imaging
US5017929A (en) * 1989-09-06 1991-05-21 Hughes Aircraft Company Angle of arrival measuring technique
US5109390A (en) * 1989-11-07 1992-04-28 Qualcomm Incorporated Diversity receiver in a cdma cellular telephone system
US5119401A (en) * 1989-11-17 1992-06-02 Nec Corporation Decision feedback equalizer including forward part whose signal reference point is shiftable depending on channel response
DE69023324T2 (en) * 1990-01-02 1996-06-27 Max Planck Gesellschaft Method and system for measuring atmospheric wind fields using spatially offset, diagonally radiating antennas.
US5220687A (en) * 1990-05-30 1993-06-15 Pioneer Electronic Corporation Radio receiver having switch for switching between a wide filter and a narrow filter
US5099493A (en) * 1990-08-27 1992-03-24 Zeger-Abrams Incorporated Multiple signal receiver for direct sequence, code division multiple access, spread spectrum signals
US5390207A (en) * 1990-11-28 1995-02-14 Novatel Communications Ltd. Pseudorandom noise ranging receiver which compensates for multipath distortion by dynamically adjusting the time delay spacing between early and late correlators
IL100213A (en) * 1990-12-07 1995-03-30 Qualcomm Inc CDMA microcellular telephone system and distributed antenna system therefor
US5513176A (en) * 1990-12-07 1996-04-30 Qualcomm Incorporated Dual distributed antenna system
US5151919A (en) * 1990-12-17 1992-09-29 Ericsson-Ge Mobile Communications Holding Inc. Cdma subtractive demodulation
US5218619A (en) 1990-12-17 1993-06-08 Ericsson Ge Mobile Communications Holding, Inc. CDMA subtractive demodulation
US5105435A (en) * 1990-12-21 1992-04-14 Motorola, Inc. Method and apparatus for cancelling spread-spectrum noise
JP2684888B2 (en) * 1991-08-06 1997-12-03 国際電信電話株式会社 Adaptive array antenna control method
US5263191A (en) 1991-12-11 1993-11-16 Westinghouse Electric Corp. Method and circuit for processing and filtering signals
JPH05268128A (en) * 1992-03-18 1993-10-15 Kokusai Denshin Denwa Co Ltd <Kdd> Cdma communication system
US5237586A (en) * 1992-03-25 1993-08-17 Ericsson-Ge Mobile Communications Holding, Inc. Rake receiver with selective ray combining
TW214620B (en) 1992-04-13 1993-10-11 Ericsson Ge Mobile Communicat Calling channel in CDMA communications system
US5224122A (en) * 1992-06-29 1993-06-29 Motorola, Inc. Method and apparatus for canceling spread-spectrum noise
EP0595247B1 (en) * 1992-10-28 1998-07-15 Atr Optical And Radio Communications Research Laboratories Apparatus for controlling array antenna comprising a plurality of antenna elements and method therefor
ZA938324B (en) * 1992-11-24 1994-06-07 Qualcomm Inc Pilot carrier dot product circuit
JPH0744473B2 (en) * 1993-02-02 1995-05-15 日本電気株式会社 Demodulation system
US5353302A (en) 1993-02-03 1994-10-04 At&T Bell Laboratories Signal despreader for CDMA systems
US5343493A (en) * 1993-03-16 1994-08-30 Hughes Aircraft Company Personal assistance system and method for use with a cellular communication system
US5553062A (en) * 1993-04-22 1996-09-03 Interdigital Communication Corporation Spread spectrum CDMA interference canceler system and method
US5305349A (en) * 1993-04-29 1994-04-19 Ericsson Ge Mobile Communications Inc. Quantized coherent rake receiver
US5437055A (en) * 1993-06-03 1995-07-25 Qualcomm Incorporated Antenna system for multipath diversity in an indoor microcellular communication system
FR2709028B1 (en) * 1993-08-13 1995-10-20 Matra Communication Method for selecting the propagation paths used to receive messages transmitted by CDMA radiocommunication.
US5343496A (en) * 1993-09-24 1994-08-30 Bell Communications Research, Inc. Interference suppression in CDMA systems
US5481570A (en) * 1993-10-20 1996-01-02 At&T Corp. Block radio and adaptive arrays for wireless systems
US5386202A (en) * 1993-11-03 1995-01-31 Sicom, Inc. Data communication modulation with managed intersymbol interference
US5553098A (en) * 1994-04-12 1996-09-03 Sicom, Inc. Demodulator with selectable coherent and differential data
US5440265A (en) * 1994-09-14 1995-08-08 Sicom, Inc. Differential/coherent digital demodulator operating at multiple symbol points
FI102797B (en) 1994-10-07 1999-02-15 Nokia Mobile Phones Ltd A method of signal detection in a receiver of a TDMA mobile communication system, and a receiver implementing the method
FI99184C (en) * 1994-11-28 1997-10-10 Nokia Telecommunications Oy Method for allocating available frequency bands to different cells in a TDMA cellular radio system and a TDMA cellular radio system
US5602833A (en) * 1994-12-19 1997-02-11 Qualcomm Incorporated Method and apparatus for using Walsh shift keying in a spread spectrum communication system
US5644592A (en) * 1995-04-24 1997-07-01 California Institute Of Technology Parallel interference cancellation for CDMA applications
US5508708A (en) * 1995-05-08 1996-04-16 Motorola, Inc. Method and apparatus for location finding in a CDMA system
US6018317A (en) 1995-06-02 2000-01-25 Trw Inc. Cochannel signal processing system
US6240124B1 (en) * 1995-06-06 2001-05-29 Globalstar L.P. Closed loop power control for low earth orbit satellite communications system
DE69633219T2 (en) 1995-06-13 2005-08-25 Ntt Docomo, Inc. CDMA demodulator
US5978413A (en) 1995-08-28 1999-11-02 Bender; Paul E. Method and system for processing a plurality of multiple access transmissions
US5872776A (en) * 1995-11-22 1999-02-16 Yang; Lin-Lang Signal detection and interference cancellation based on simplified matrix inversion for CDMA applications
JP3272940B2 (en) * 1996-03-07 2002-04-08 ケイディーディーアイ株式会社 Spread spectrum signal demodulator
US6127973A (en) 1996-04-18 2000-10-03 Korea Telecom Freetel Co., Ltd. Signal processing apparatus and method for reducing the effects of interference and noise in wireless communication systems
US5781864A (en) * 1996-05-20 1998-07-14 Metawave Communications Corporation Cellular system conditioner which overrides a disconnect for active radios wirelessly communicating with mobiles located in pre-identified territorial positions
US6396804B2 (en) * 1996-05-28 2002-05-28 Qualcomm Incorporated High data rate CDMA wireless communication system
JP2743912B2 (en) * 1996-05-30 1998-04-28 日本電気株式会社 CDMA interference canceller
JP2746261B2 (en) * 1996-06-10 1998-05-06 日本電気株式会社 DS-CDMA interference cancellation device
US5926761A (en) * 1996-06-11 1999-07-20 Motorola, Inc. Method and apparatus for mitigating the effects of interference in a wireless communication system
DE19623667C2 (en) * 1996-06-13 2003-02-13 Siemens Ag Method and device for the detection of information transmitted according to the DS-CDMA principle in a receiving device
US6430216B1 (en) * 1997-08-22 2002-08-06 Data Fusion Corporation Rake receiver for spread spectrum signal demodulation
US5859613A (en) * 1996-08-30 1999-01-12 Harris Corporation System and method for geolocating plural remote transmitters
US6512481B1 (en) * 1996-10-10 2003-01-28 Teratech Corporation Communication system using geographic position data
JP3311943B2 (en) 1996-10-18 2002-08-05 松下電器産業株式会社 Interference signal canceller
US6222828B1 (en) * 1996-10-30 2001-04-24 Trw, Inc. Orthogonal code division multiple access waveform format for use in satellite based cellular telecommunications
US6243372B1 (en) * 1996-11-14 2001-06-05 Omnipoint Corporation Methods and apparatus for synchronization in a wireless network
US5844521A (en) 1996-12-02 1998-12-01 Trw Inc. Geolocation method and apparatus for satellite based telecommunications system
US5787130A (en) * 1996-12-10 1998-07-28 Motorola Inc. Method and apparatus for canceling interference in a spread-spectrum communication system
JP3390900B2 (en) * 1996-12-20 2003-03-31 富士通株式会社 Interference canceller and provisional determination method
JPH10190495A (en) 1996-12-20 1998-07-21 Fujitsu Ltd Interference canceler
US6163696A (en) 1996-12-31 2000-12-19 Lucent Technologies Inc. Mobile location estimation in a wireless communication system
JP3326679B2 (en) * 1997-01-31 2002-09-24 沖電気工業株式会社 CDMA receiver
US5943331A (en) 1997-02-28 1999-08-24 Interdigital Technology Corporation Orthogonal code synchronization system and method for spread spectrum CDMA communications
US6233459B1 (en) * 1997-04-10 2001-05-15 The Atlantis Company, Limited, Japan System for providing Geolocation of a mobile transceiver
US6201799B1 (en) * 1997-05-01 2001-03-13 Lucent Technologies, Inc Partial decorrelation for a coherent multicode code division multiple access receiver
US5894500A (en) * 1997-06-13 1999-04-13 Motorola, Inc. Method and apparatus for canceling signals in a spread-spectrum communication system
US5872540A (en) * 1997-06-26 1999-02-16 Electro-Radiation Incorporated Digital interference suppression system for radio frequency interference cancellation
US6359874B1 (en) * 1998-05-21 2002-03-19 Ericsson Inc. Partially block-interleaved CDMA coding and decoding
GB2343801B (en) * 1997-08-21 2001-09-12 Data Fusion Corp Method and apparatus for acquiring wide-band pseudorandom noise encoded waveforms
US6101385A (en) * 1997-10-09 2000-08-08 Globalstar L.P. Satellite communication service with non-congruent sub-beam coverage
US6157842A (en) 1997-10-16 2000-12-05 Telefonaktiebolaget Lm Ericsson System and method for positioning a mobile station in a CDMA cellular system
US6131013A (en) 1998-01-30 2000-10-10 Motorola, Inc. Method and apparatus for performing targeted interference suppression
US6219376B1 (en) * 1998-02-21 2001-04-17 Topcon Positioning Systems, Inc. Apparatuses and methods of suppressing a narrow-band interference with a compensator and adjustment loops
JP2937994B1 (en) * 1998-03-04 1999-08-23 日本電気移動通信株式会社 Cellular system, mobile portable device, base station device, and optimal path detection method and device
JP2965202B1 (en) * 1998-04-07 1999-10-18 日本電気株式会社 Multi-user receiving apparatus and CDMA communication system
US6266529B1 (en) * 1998-05-13 2001-07-24 Nortel Networks Limited Method for CDMA handoff in the vicinity of highly sectorized cells
JP2970656B1 (en) * 1998-06-25 1999-11-02 日本電気株式会社 DS-CDMA multi-user interference canceller
US6154443A (en) 1998-08-11 2000-11-28 Industrial Technology Research Institute FFT-based CDMA RAKE receiver system and method
US6363104B1 (en) * 1998-10-02 2002-03-26 Ericsson Inc. Method and apparatus for interference cancellation in a rake receiver
US6230180B1 (en) * 1998-10-14 2001-05-08 Conexant Systems, Inc. Digital signal processor configuration including multiplying units coupled to plural accumlators for enhanced parallel mac processing
KR100378124B1 (en) * 1998-12-10 2003-06-19 삼성전자주식회사 Device and method for estimating the position of terminal in mobile communication system
US6351642B1 (en) * 1998-12-22 2002-02-26 Telefonaktiebolaget Lm Ericsson (Publ) CDMA soft hand-off
US6184829B1 (en) * 1999-01-08 2001-02-06 Trueposition, Inc. Calibration for wireless location system
US6215812B1 (en) * 1999-01-28 2001-04-10 Bae Systems Canada Inc. Interference canceller for the protection of direct-sequence spread-spectrum communications from high-power narrowband interference
US6104712A (en) * 1999-02-22 2000-08-15 Robert; Bruno G. Wireless communication network including plural migratory access nodes
US6263208B1 (en) * 1999-05-28 2001-07-17 Lucent Technologies Inc. Geolocation estimation method for CDMA terminals based on pilot strength measurements
US6385264B1 (en) * 1999-06-08 2002-05-07 Qualcomm Incorporated Method and apparatus for mitigating interference between base stations in a wideband CDMA system
US6115409A (en) * 1999-06-21 2000-09-05 Envoy Networks, Inc. Integrated adaptive spatial-temporal system for controlling narrowband and wideband sources of interferences in spread spectrum CDMA receivers
US6157847A (en) 1999-06-29 2000-12-05 Lucent Technologies Inc. Base station system including parallel interference cancellation processor
US6166690A (en) 1999-07-02 2000-12-26 Sensor Systems, Inc. Adaptive nulling methods for GPS reception in multiple-interference environments
US6570909B1 (en) * 1999-07-09 2003-05-27 Nokia Mobile Phones Interference suppression in a CDMA receiver
US6404760B1 (en) * 1999-07-19 2002-06-11 Qualcomm Incorporated CDMA multiple access interference cancellation using signal estimation
US6574270B1 (en) * 1999-07-30 2003-06-03 Ericsson Inc. Baseband interference canceling spread spectrum communications methods and apparatus
US6278726B1 (en) * 1999-09-10 2001-08-21 Interdigital Technology Corporation Interference cancellation in a spread spectrum communication system
US6515980B1 (en) * 1999-09-22 2003-02-04 Ericsson Inc. Methods and apparatus for interference cancellation using complex interference orthogonalization techniques
KR100484993B1 (en) * 1999-10-19 2005-04-25 인터디지탈 테크날러지 코포레이션 Receiver for multiuser detection of cdma signals
US6377636B1 (en) * 1999-11-02 2002-04-23 Iospan Wirless, Inc. Method and wireless communications system using coordinated transmission and training for interference mitigation
US6282231B1 (en) * 1999-12-14 2001-08-28 Sirf Technology, Inc. Strong signal cancellation to enhance processing of weak spread spectrum signal
US6975666B2 (en) * 1999-12-23 2005-12-13 Institut National De La Recherche Scientifique Interference suppression in CDMA systems
JP4292442B2 (en) * 2000-01-31 2009-07-08 ソニー株式会社 Global positioning system receiver and portable radio terminal
US6680727B2 (en) * 2000-10-17 2004-01-20 Qualcomm Incorporated Method and apparatus for canceling pilot interference in a CDMA communication system
US6580771B2 (en) * 2001-03-30 2003-06-17 Nokia Corporation Successive user data multipath interference cancellation

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6175587B1 (en) * 1997-12-30 2001-01-16 Motorola, Inc. Communication device and method for interference suppression in a DS-CDMA system
US6285861B1 (en) * 1999-06-14 2001-09-04 Qualcomm Incorporated Receiving station with interference signal suppression

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US7430253B2 (en) 2008-09-30
AU2003301493A8 (en) 2004-05-04
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WO2004036811A2 (en) 2004-04-29
WO2004036811A9 (en) 2004-06-17

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