AU2002224392A1 - Multipath interference reduction for a cdma system - Google Patents

Multipath interference reduction for a cdma system

Info

Publication number
AU2002224392A1
AU2002224392A1 AU2002224392A AU2439202A AU2002224392A1 AU 2002224392 A1 AU2002224392 A1 AU 2002224392A1 AU 2002224392 A AU2002224392 A AU 2002224392A AU 2439202 A AU2439202 A AU 2439202A AU 2002224392 A1 AU2002224392 A1 AU 2002224392A1
Authority
AU
Australia
Prior art keywords
rake
multipath interference
receiver
finger
multipath
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
AU2002224392A
Inventor
Essam Sourour
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ericsson Inc
Original Assignee
Ericsson Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ericsson Inc filed Critical Ericsson Inc
Publication of AU2002224392A1 publication Critical patent/AU2002224392A1/en
Abandoned legal-status Critical Current

Links

Classifications

    • 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

Abstract

A method and system reduce multipath signal interference in a CDMA receiver. The CDMA receiver including parallel first and second RAKE receivers receives a multipath signal. The first RAKE receiver includes a number of individual RAKE fingers, each operating with a defined finger delay matched to a propagation path delay. The output signal from each RAKE finger includes multipath interference. The second RAKE receiver includes a group of RAKE fingers corresponding to each RAKE finger in the first RAKE receiver. Each group of RAKE fingers is configured to produce an estimate of the multipath interference in the output signal generated by the corresponding RAKE finger in the first RAKE receiver. The estimated multipath interference signals are scaled, and then subtracted from the RAKE finger outputs from the first RAKE receiver to reduce multipath interference. Scaling coefficients are adjusted to ensure that such subtraction effectively reduces multipath interference.
AU2002224392A 2000-11-27 2001-10-16 Multipath interference reduction for a cdma system Abandoned AU2002224392A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US09/723,152 US6865218B1 (en) 2000-11-27 2000-11-27 Multipath interference reduction for a CDMA system
US09/723,152 2000-11-27
PCT/US2001/032335 WO2002043266A2 (en) 2000-11-27 2001-10-16 Multipath interference reduction for a cdma system

Publications (1)

Publication Number Publication Date
AU2002224392A1 true AU2002224392A1 (en) 2002-06-03

Family

ID=24905078

Family Applications (1)

Application Number Title Priority Date Filing Date
AU2002224392A Abandoned AU2002224392A1 (en) 2000-11-27 2001-10-16 Multipath interference reduction for a cdma system

Country Status (6)

Country Link
US (1) US6865218B1 (en)
EP (1) EP1384330B1 (en)
AT (1) ATE382207T1 (en)
AU (1) AU2002224392A1 (en)
DE (1) DE60132116D1 (en)
WO (1) WO2002043266A2 (en)

Families Citing this family (79)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7039036B1 (en) * 1999-04-01 2006-05-02 Texas Instruments Incorporated Reduced complexity primary and secondary synchronization codes with good correlation properties for WCDMA
EP1117185A1 (en) * 2000-01-14 2001-07-18 Lucent Technologies Inc. Method and rake receiver for code-tracking in CDMA communication systems
EP1117186A1 (en) * 2000-01-14 2001-07-18 Lucent Technologies Inc. Adaptive code-tracking RAKE receiver for direct-sequence code-division multiple access (cdma) communications
EP1130792A1 (en) * 2000-03-03 2001-09-05 Lucent Technologies Inc. A method and rake receiver for phasor estimation in communication systems
US7236500B1 (en) * 2000-12-19 2007-06-26 Intel Corporation Demodulation of multi-user, multi-protocol data in a reconfigurable datapath
US6771692B2 (en) * 2001-01-11 2004-08-03 Qualcomm Incorporated Time tracking in a non-negligible multipath spacing environment
DE10105733A1 (en) * 2001-02-08 2002-09-26 Infineon Technologies Ag Method for determining the interference power in a CDMA radio receiver and CDMA radio receiver
US7190749B2 (en) * 2001-06-06 2007-03-13 Qualcomm Incorporated Method and apparatus for canceling pilot interference in a wireless communication system
US8611311B2 (en) * 2001-06-06 2013-12-17 Qualcomm Incorporated Method and apparatus for canceling pilot interference in a wireless communication system
US7330496B2 (en) * 2001-10-19 2008-02-12 Matsushita Electric Industrial Co., Ltd. System and method for spread spectrum communication
EP1365518A1 (en) * 2002-05-21 2003-11-26 Nokia Corporation Method and apparatus for synchronisation of DS-CDMA multipath signals
US7085582B2 (en) * 2002-07-31 2006-08-01 Motorola, Inc. Pilot information gain control method and apparatus
US7075972B2 (en) * 2002-08-19 2006-07-11 Mitsubishi Electric Research Laboratories, Inc. Intra-cell interference cancellation in a W-CDMA communications network
US7103094B2 (en) * 2002-08-29 2006-09-05 Broadcom Corporation Adaptive pilot interference cancellation in CDMA systems
EP1548953B1 (en) * 2002-09-13 2009-08-19 Fujitsu Limited Spread spectrum rake receiver
US7573934B2 (en) * 2002-09-13 2009-08-11 Fujitsu Limited Spread spectrum rake receiver
SG108874A1 (en) * 2002-09-17 2005-02-28 Sony Corp Channel equalisation
US8005128B1 (en) * 2003-09-23 2011-08-23 Rambus Inc. Methods for estimation and interference cancellation for signal processing
CN100456658C (en) * 2002-12-31 2009-01-28 上海贝尔阿尔卡特股份有限公司 Method of paging message transmission in orthogonal frequency division multiplex system and its receiving transmitting device
US7555067B2 (en) * 2003-03-13 2009-06-30 Texas Instruments Incorporated Method and apparatus for decoder input scaling based on interference estimation in CDMA
US7212591B2 (en) 2003-04-28 2007-05-01 Telefonaktiebolaget Lm Ericsson (Publ) Methods and receivers that estimate multi-path delays by removing signal rays from a power-delay profile
US7239677B2 (en) 2003-04-29 2007-07-03 Telefonaktiebolaget L M Ericsson (Publ) Method and apparatus for soft symbol scaling
US7116998B2 (en) 2003-05-14 2006-10-03 Telefonaktiebolaget L M Ericsson (Publ) Subtractive multipath delay detection
CN100525528C (en) * 2003-08-05 2009-08-05 大唐移动通信设备有限公司 Quadrature code CDMA signal detecting method
US7352704B1 (en) * 2003-08-29 2008-04-01 National Semiconductor Corporation Method and apparatus for multi-path delay spread detection in wideband CDMA systems
US7251497B2 (en) * 2003-12-31 2007-07-31 Infineon Technologies Ag Signal-to-interference ratio estimation for CDMA
JP2005354255A (en) * 2004-06-09 2005-12-22 Fujitsu Ltd Device and method for eliminating interference
US8442441B2 (en) * 2004-12-23 2013-05-14 Qualcomm Incorporated Traffic interference cancellation
US8406695B2 (en) 2004-12-23 2013-03-26 Qualcomm Incorporated Joint interference cancellation of pilot, overhead and traffic channels
US8099123B2 (en) * 2004-12-23 2012-01-17 Qualcomm Incorporated Adaptation of transmit subchannel gains in a system with interference cancellation
US8422955B2 (en) * 2004-12-23 2013-04-16 Qualcomm Incorporated Channel estimation for interference cancellation
US20060268916A1 (en) * 2005-05-09 2006-11-30 Sarkar Susanta P Reliable short messaging service
US8472877B2 (en) * 2005-10-24 2013-06-25 Qualcomm Incorporated Iterative interference cancellation system and method
US8385388B2 (en) * 2005-12-06 2013-02-26 Qualcomm Incorporated Method and system for signal reconstruction from spatially and temporally correlated received samples
GB0601952D0 (en) 2006-01-31 2006-03-15 M M I Res Ltd Methods of maintaining connection with, and determining the direction of, a mobile device
US8312551B2 (en) 2007-02-15 2012-11-13 Harris Corporation Low level sequence as an anti-tamper Mechanism
US8611530B2 (en) 2007-05-22 2013-12-17 Harris Corporation Encryption via induced unweighted errors
US8009722B2 (en) * 2007-12-12 2011-08-30 Telefonaktiebolaget Lm Ericsson (Publ) Multi-pass parameter estimation for G-Rake receiver
WO2009076577A1 (en) * 2007-12-12 2009-06-18 Rosum Corporation Transmitter identification for wireless signals having a digital audio broadcast (dab) physical layer
US8363830B2 (en) 2008-02-07 2013-01-29 Harris Corporation Cryptographic system configured to perform a mixed radix conversion with a priori defined statistical artifacts
US8320557B2 (en) 2008-05-08 2012-11-27 Harris Corporation Cryptographic system including a mixed radix number generator with chosen statistical artifacts
US8325702B2 (en) * 2008-08-29 2012-12-04 Harris Corporation Multi-tier ad-hoc network in which at least two types of non-interfering waveforms are communicated during a timeslot
US8351484B2 (en) 2008-12-29 2013-01-08 Harris Corporation Communications system employing chaotic spreading codes with static offsets
US8406276B2 (en) 2008-12-29 2013-03-26 Harris Corporation Communications system employing orthogonal chaotic spreading codes
US8457077B2 (en) 2009-03-03 2013-06-04 Harris Corporation Communications system employing orthogonal chaotic spreading codes
US8509284B2 (en) 2009-06-08 2013-08-13 Harris Corporation Symbol duration dithering for secured chaotic communications
US8428102B2 (en) 2009-06-08 2013-04-23 Harris Corporation Continuous time chaos dithering
US8428103B2 (en) 2009-06-10 2013-04-23 Harris Corporation Discrete time chaos dithering
US8369376B2 (en) 2009-07-01 2013-02-05 Harris Corporation Bit error rate reduction in chaotic communications
US8379689B2 (en) 2009-07-01 2013-02-19 Harris Corporation Anti-jam communications having selectively variable peak-to-average power ratio including a chaotic constant amplitude zero autocorrelation waveform
US8340295B2 (en) 2009-07-01 2012-12-25 Harris Corporation High-speed cryptographic system using chaotic sequences
US8385385B2 (en) 2009-07-01 2013-02-26 Harris Corporation Permission-based secure multiple access communication systems
US8363700B2 (en) * 2009-07-01 2013-01-29 Harris Corporation Rake receiver for spread spectrum chaotic communications systems
US8428104B2 (en) * 2009-07-01 2013-04-23 Harris Corporation Permission-based multiple access communications systems
US8406352B2 (en) 2009-07-01 2013-03-26 Harris Corporation Symbol estimation for chaotic spread spectrum signal
US8848909B2 (en) 2009-07-22 2014-09-30 Harris Corporation Permission-based TDMA chaotic communication systems
US8369377B2 (en) 2009-07-22 2013-02-05 Harris Corporation Adaptive link communications using adaptive chaotic spread waveform
US8345725B2 (en) * 2010-03-11 2013-01-01 Harris Corporation Hidden Markov Model detection for spread spectrum waveforms
US9893773B2 (en) * 2011-09-21 2018-02-13 Provenance Asset Group Llc System and method of wireless communication using large-scale antenna networks
US9635501B2 (en) * 2013-12-23 2017-04-25 Microsemi Frequency And Time Corporation Method and system for synchronizing base station and establishing location
WO2017175190A1 (en) 2016-04-07 2017-10-12 Uhnder, Inc. Adaptive transmission and interference cancellation for mimo radar
US10261179B2 (en) 2016-04-07 2019-04-16 Uhnder, Inc. Software defined automotive radar
US9846228B2 (en) 2016-04-07 2017-12-19 Uhnder, Inc. Software defined automotive radar systems
US9791551B1 (en) 2016-04-25 2017-10-17 Uhnder, Inc. Vehicular radar system with self-interference cancellation
US10573959B2 (en) 2016-04-25 2020-02-25 Uhnder, Inc. Vehicle radar system using shaped antenna patterns
US9791564B1 (en) 2016-04-25 2017-10-17 Uhnder, Inc. Adaptive filtering for FMCW interference mitigation in PMCW radar systems
US9945935B2 (en) 2016-04-25 2018-04-17 Uhnder, Inc. Digital frequency modulated continuous wave radar using handcrafted constant envelope modulation
WO2017187299A2 (en) * 2016-04-25 2017-11-02 Uhnder, Inc. Successive signal interference mitigation
US9772397B1 (en) 2016-04-25 2017-09-26 Uhnder, Inc. PMCW-PMCW interference mitigation
WO2017187331A1 (en) 2016-04-25 2017-11-02 Uhnder, Inc. Vehicle radar system with a shared radar and communication system
US9753121B1 (en) 2016-06-20 2017-09-05 Uhnder, Inc. Power control for improved near-far performance of radar systems
WO2018146530A1 (en) 2017-02-10 2018-08-16 Uhnder, Inc. Reduced complexity fft-based correlation for automotive radar
WO2018146633A1 (en) 2017-02-10 2018-08-16 Uhnder, Inc. Programmable code generation for radar sensing systems
US11454697B2 (en) 2017-02-10 2022-09-27 Uhnder, Inc. Increasing performance of a receive pipeline of a radar with memory optimization
US11105890B2 (en) 2017-12-14 2021-08-31 Uhnder, Inc. Frequency modulated signal cancellation in variable power mode for radar applications
US11474225B2 (en) 2018-11-09 2022-10-18 Uhnder, Inc. Pulse digital mimo radar system
WO2020183392A1 (en) 2019-03-12 2020-09-17 Uhnder, Inc. Method and apparatus for mitigation of low frequency noise in radar systems
US11729650B2 (en) * 2019-11-18 2023-08-15 Qualcomm Incorporated Neighbor measurement adjustment for dual connectivity
US20210215820A1 (en) 2020-01-13 2021-07-15 Uhnder, Inc. Method and system for intefrence management for digital radars

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6233272B1 (en) * 1996-03-19 2001-05-15 Yrp Mobile Telecommunications Key Technology Research Laboratories Co., Ltd. Spread spectrum communication receiver
US6067292A (en) 1996-08-20 2000-05-23 Lucent Technologies Inc Pilot interference cancellation for a coherent wireless code division multiple access receiver
IL120538A (en) * 1997-03-26 2000-11-21 Dspc Tech Ltd Method and apparatus for reducing spread-spectrum noise
US6570909B1 (en) * 1999-07-09 2003-05-27 Nokia Mobile Phones Interference suppression in a CDMA receiver

Also Published As

Publication number Publication date
ATE382207T1 (en) 2008-01-15
WO2002043266A3 (en) 2003-11-13
EP1384330B1 (en) 2007-12-26
DE60132116D1 (en) 2008-02-07
US6865218B1 (en) 2005-03-08
EP1384330A2 (en) 2004-01-28
WO2002043266A2 (en) 2002-05-30

Similar Documents

Publication Publication Date Title
AU2002224392A1 (en) Multipath interference reduction for a cdma system
WO2004008647A3 (en) Multistage adaptive parallel interference canceller
KR100315197B1 (en) Spread-spectrum receiver
WO2001005052A1 (en) Interference suppression in a cdma receiver
DE69930527D1 (en) Rake receiver
WO2001006664A3 (en) Cdma multiple access interference cancellation using signal estimation
CA2279471A1 (en) Detectors for cdma systems
WO2004021581A3 (en) Adaptive pilot interference cancellation in cdma systems
EP0957592A3 (en) Time alignment of uplink CDMA signals
AU2001293862A1 (en) Method and apparatus for automatic frequency control in a cdma receiver
AU2003264129A1 (en) Assessment of delay estimation quality using interference estimates
JP3800382B2 (en) Propagation path estimation method and interference canceller in interference canceller
AU2008334776A1 (en) Speed-based, hybrid parametric/non-parametric equalization
EP1279239B1 (en) Matched filter and receiver for mobile radio communication system
DE60131362D1 (en) FOLLOWING A MULTI-WAY SIGNAL IN A RAKE RECEIVER
WO2003013088A3 (en) Joint synchronization and modification of the coefficients of an adaptive equalizer for a cdma receiver
AU2003260498A1 (en) Advanced rake delay control
WO2004038977A3 (en) Method and apparatus for block-based chip timing estimation in a code division multiple access communication system
EP1229667A3 (en) Selection of multiple propagation paths by successive removal and detection of high autocorrelations
AU2003293313A1 (en) Systems, methods of operating, and computer program products for selecting delays for a rake receiver based on signal to interfence ratios and/or powers
KR20060114747A (en) Baseband transceive of ultra wide band radio communication system
JP2000332652A (en) Synthesis method of cdma cellular in rake receiver
JP3691723B2 (en) base station
AU2003247408A1 (en) Time delay estimation for equalisation
KR100358349B1 (en) Apparatus and Method of Group-wise Parallel Interference Cancellation for Multi-rate DS-CDMA Systems