WO2002043266A3 - Multipath interference reduction for a cdma system - Google Patents

Multipath interference reduction for a cdma system Download PDF

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Publication number
WO2002043266A3
WO2002043266A3 PCT/US2001/032335 US0132335W WO0243266A3 WO 2002043266 A3 WO2002043266 A3 WO 2002043266A3 US 0132335 W US0132335 W US 0132335W WO 0243266 A3 WO0243266 A3 WO 0243266A3
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WO
WIPO (PCT)
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.)
Ceased
Application number
PCT/US2001/032335
Other languages
French (fr)
Other versions
WO2002043266A2 (en
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
Priority to AU2002224392A priority Critical patent/AU2002224392A1/en
Priority to EP01997902A priority patent/EP1384330B1/en
Priority to DE60132116T priority patent/DE60132116D1/en
Publication of WO2002043266A2 publication Critical patent/WO2002043266A2/en
Anticipated expiration legal-status Critical
Publication of WO2002043266A3 publication Critical patent/WO2002043266A3/en
Ceased legal-status Critical Current

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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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Noise Elimination (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Farming Of Fish And Shellfish (AREA)
  • Micro-Organisms Or Cultivation Processes Thereof (AREA)
  • Preparation Of Compounds By Using Micro-Organisms (AREA)

Abstract

A method and system reduce multipath signal interference in a CDMA receiver. The CDMA receiver comprising 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.
PCT/US2001/032335 2000-11-27 2001-10-16 Multipath interference reduction for a cdma system Ceased WO2002043266A2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AU2002224392A AU2002224392A1 (en) 2000-11-27 2001-10-16 Multipath interference reduction for a cdma system
EP01997902A EP1384330B1 (en) 2000-11-27 2001-10-16 Multipath interference reduction for a cdma system
DE60132116T DE60132116D1 (en) 2000-11-27 2001-10-16 MULTI-DISCUSSION REDUCTION FOR A CDMA SYSTEM

Applications Claiming Priority (2)

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

Publications (2)

Publication Number Publication Date
WO2002043266A2 WO2002043266A2 (en) 2002-05-30
WO2002043266A3 true WO2002043266A3 (en) 2003-11-13

Family

ID=24905078

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2001/032335 Ceased WO2002043266A2 (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)

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Also Published As

Publication number Publication date
DE60132116D1 (en) 2008-02-07
US6865218B1 (en) 2005-03-08
EP1384330B1 (en) 2007-12-26
AU2002224392A1 (en) 2002-06-03
ATE382207T1 (en) 2008-01-15
WO2002043266A2 (en) 2002-05-30
EP1384330A2 (en) 2004-01-28

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