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WO2007038018A3 - Iterative interference cancellation using mixed feedback weights and stabilizing step sizes - Google Patents

Iterative interference cancellation using mixed feedback weights and stabilizing step sizes Download PDF

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Publication number
WO2007038018A3
WO2007038018A3 PCT/US2006/036018 US2006036018W WO2007038018A3 WO 2007038018 A3 WO2007038018 A3 WO 2007038018A3 US 2006036018 W US2006036018 W US 2006036018W WO 2007038018 A3 WO2007038018 A3 WO 2007038018A3
Authority
WO
WIPO (PCT)
Prior art keywords
rake
stabilizing step
receiver
interference cancellation
step sizes
Prior art date
Application number
PCT/US2006/036018
Other languages
French (fr)
Other versions
WO2007038018A2 (en
Inventor
Tommy Guess
Michael L Mccloud
Vijay Nagarajan
Singh Lamba Gagandeep
Original Assignee
Tensorcomm 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
Priority claimed from US11/233,636 external-priority patent/US8761321B2/en
Priority claimed from US11/451,688 external-priority patent/US7702048B2/en
Application filed by Tensorcomm Inc filed Critical Tensorcomm Inc
Publication of WO2007038018A2 publication Critical patent/WO2007038018A2/en
Publication of WO2007038018A3 publication Critical patent/WO2007038018A3/en

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
    • H04B1/71075—Parallel 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
    • H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
    • H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
    • H04B2201/70702—Intercell-related aspects

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Noise Elimination (AREA)

Abstract

A receiver is configured for canceling intra-cell and inter-cell interference in coded, multiple-access, spread-spectrum transmissions that propagate through frequency-selective communication channels. The receiver employs iterative symbol-estimate weighting, subtractive cancellation with a stabilizing step-size, and mixed-decision symbol estimates. Receiver embodiments may be implemented explicitly in software or programmed hardware, or implicitly in standard Rake-based hardware either within the Rake (i.e., at the finger level) or outside the Rake (i.e., at the user or subchannel symbol level).
PCT/US2006/036018 2005-09-23 2006-09-15 Iterative interference cancellation using mixed feedback weights and stabilizing step sizes WO2007038018A2 (en)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US11/233,636 2005-09-23
US11/233,636 US8761321B2 (en) 2005-04-07 2005-09-23 Optimal feedback weighting for soft-decision cancellers
US73620405P 2005-11-15 2005-11-15
US60/736,204 2005-11-15
US11/451,688 2006-06-13
US11/451,688 US7702048B2 (en) 2005-11-15 2006-06-13 Iterative interference cancellation using mixed feedback weights and stabilizing step sizes

Publications (2)

Publication Number Publication Date
WO2007038018A2 WO2007038018A2 (en) 2007-04-05
WO2007038018A3 true WO2007038018A3 (en) 2007-12-13

Family

ID=37900239

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2006/036018 WO2007038018A2 (en) 2005-09-23 2006-09-15 Iterative interference cancellation using mixed feedback weights and stabilizing step sizes

Country Status (1)

Country Link
WO (1) WO2007038018A2 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6714585B1 (en) * 1999-06-25 2004-03-30 Ericsson Inc. Rake combining methods and apparatus using weighting factors derived from knowledge of spreading spectrum signal characteristics
US20040196892A1 (en) * 1999-10-19 2004-10-07 Interdigital Technology Corporation Parallel interference cancellation receiver for multiuser detection CDMA signals
US20050163196A1 (en) * 1999-08-31 2005-07-28 Currivan Bruce J. Cancellation of burst noise in a communication system with application to S-CDMA
US20050180364A1 (en) * 2002-09-20 2005-08-18 Vijay Nagarajan Construction of projection operators for interference cancellation

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6714585B1 (en) * 1999-06-25 2004-03-30 Ericsson Inc. Rake combining methods and apparatus using weighting factors derived from knowledge of spreading spectrum signal characteristics
US20050163196A1 (en) * 1999-08-31 2005-07-28 Currivan Bruce J. Cancellation of burst noise in a communication system with application to S-CDMA
US20040196892A1 (en) * 1999-10-19 2004-10-07 Interdigital Technology Corporation Parallel interference cancellation receiver for multiuser detection CDMA signals
US20050180364A1 (en) * 2002-09-20 2005-08-18 Vijay Nagarajan Construction of projection operators for interference cancellation

Also Published As

Publication number Publication date
WO2007038018A2 (en) 2007-04-05

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