AU2001267314A1 - Method and assembly for the multi-stage parallel cancellation of interference ina cdma system - Google Patents

Method and assembly for the multi-stage parallel cancellation of interference ina cdma system

Info

Publication number
AU2001267314A1
AU2001267314A1 AU2001267314A AU6731401A AU2001267314A1 AU 2001267314 A1 AU2001267314 A1 AU 2001267314A1 AU 2001267314 A AU2001267314 A AU 2001267314A AU 6731401 A AU6731401 A AU 6731401A AU 2001267314 A1 AU2001267314 A1 AU 2001267314A1
Authority
AU
Australia
Prior art keywords
stage
interference
hypotheses
interference cancellation
assembly
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
AU2001267314A
Inventor
Ralf Irmer
Achim Nahler
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.)
NXP Semiconductors Germany GmbH
Original Assignee
Systemonic AG
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 Systemonic AG filed Critical Systemonic AG
Publication of AU2001267314A1 publication Critical patent/AU2001267314A1/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
    • H04B1/71075—Parallel interference cancellation
    • 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
    • H04B2201/70707—Efficiency-related aspects

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Noise Elimination (AREA)
  • Time-Division Multiplex Systems (AREA)

Abstract

The invention relates to a method for receiving CDMA signals from several users, according to which the multi-user interference which occurs is reduced by parallel interference cancellation in several stages, or by multi-stage interference cancellation. According to said method, single-user detectors are used in a zero stage, the initial variables of said detectors representing symbol hypotheses of the zero stage which can be valuated using a decision function. In the subsequent first stage, a parallel interference cancellation takes place, whose initial variables represent symbol hypotheses of the first stage which can be valuated using a decision function. The method is characterised in that in the subsequent stages following the first stage, the interference is only re-calculated if the symbol hypotheses between the two previous stages change, or the respective values of the difference of said hypotheses exceed a certain threshold. The invention can be implemented in a simple manner.
AU2001267314A 2000-05-19 2001-05-18 Method and assembly for the multi-stage parallel cancellation of interference ina cdma system Abandoned AU2001267314A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10026615 2000-05-19
DE10026615A DE10026615B4 (en) 2000-05-19 2000-05-19 Method and arrangement for receiving CDMA signals
PCT/DE2001/001898 WO2001089107A1 (en) 2000-05-19 2001-05-18 Method and assembly for the multi-stage parallel cancellation of interference in a cdma system

Publications (1)

Publication Number Publication Date
AU2001267314A1 true AU2001267314A1 (en) 2001-11-26

Family

ID=7643986

Family Applications (1)

Application Number Title Priority Date Filing Date
AU2001267314A Abandoned AU2001267314A1 (en) 2000-05-19 2001-05-18 Method and assembly for the multi-stage parallel cancellation of interference ina cdma system

Country Status (5)

Country Link
EP (1) EP1410521B1 (en)
AT (1) ATE377295T1 (en)
AU (1) AU2001267314A1 (en)
DE (2) DE10026615B4 (en)
WO (1) WO2001089107A1 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101013615B1 (en) 2002-04-12 2011-02-10 톰슨 라이센싱 Control circuit
CN100373836C (en) * 2002-05-30 2008-03-05 华为技术有限公司 Method and device for eliminating interference in parallel
US7876810B2 (en) 2005-04-07 2011-01-25 Rambus Inc. Soft weighted interference cancellation for CDMA systems
US7808937B2 (en) 2005-04-07 2010-10-05 Rambus, Inc. Variable interference cancellation technology for CDMA systems
US7715508B2 (en) 2005-11-15 2010-05-11 Tensorcomm, Incorporated Iterative interference cancellation using mixed feedback weights and stabilizing step sizes
US7826516B2 (en) 2005-11-15 2010-11-02 Rambus Inc. Iterative interference canceller for wireless multiple-access systems with multiple receive antennas
WO2006131522A1 (en) 2005-06-10 2006-12-14 Siemens Aktiengesellschaft Device and method for diagnosis and/or treatment of functional gastrointestinal diseases
WO2007038016A2 (en) * 2005-09-23 2007-04-05 Tensorcomm, Inc. An iterative interference canceller for wireless multiple-access systems with multiple receive antennas

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5151919A (en) * 1990-12-17 1992-09-29 Ericsson-Ge Mobile Communications Holding Inc. Cdma subtractive demodulation
US5553062A (en) * 1993-04-22 1996-09-03 Interdigital Communication Corporation Spread spectrum CDMA interference canceler system and method
GB9317604D0 (en) * 1993-08-24 1993-10-06 Philips Electronics Uk Ltd Receiver for ds-cdma signals
DE4329317A1 (en) * 1993-08-31 1995-03-02 Siemens Ag Method and system for transmitting data
US5506861A (en) * 1993-11-22 1996-04-09 Ericsson Ge Mobile Comminications Inc. System and method for joint demodulation of CDMA signals
US5784368A (en) * 1994-09-23 1998-07-21 Motorola, Inc. Method and apparatus for providing a synchronous communication environment
US5644592A (en) * 1995-04-24 1997-07-01 California Institute Of Technology Parallel interference cancellation for CDMA applications
US5872776A (en) * 1995-11-22 1999-02-16 Yang; Lin-Lang Signal detection and interference cancellation based on simplified matrix inversion for CDMA applications
DE19616828C2 (en) * 1996-04-26 1999-02-25 Siemens Ag Method for separating a received signal mixture
DE19630391C1 (en) * 1996-07-26 1997-07-24 Siemens Ag Two-stage data detection method esp. for receiver in communication system
JP3311943B2 (en) * 1996-10-18 2002-08-05 松下電器産業株式会社 Interference signal canceller
JP3390900B2 (en) * 1996-12-20 2003-03-31 富士通株式会社 Interference canceller and provisional determination method
WO1999009674A2 (en) * 1997-08-13 1999-02-25 Qualcomm Incorporated Method and apparatus for interference cancellation for a high data rate user in a cdma system
JP3778397B2 (en) * 1997-12-27 2006-05-24 ソニー株式会社 Transmission method, transmission power control method, and base station apparatus
DE19826036C2 (en) * 1998-06-12 2000-05-25 Bosch Gmbh Robert Method for separating several superimposed coded user signals

Also Published As

Publication number Publication date
DE50113207D1 (en) 2007-12-13
EP1410521A1 (en) 2004-04-21
WO2001089107A1 (en) 2001-11-22
ATE377295T1 (en) 2007-11-15
DE10026615B4 (en) 2004-12-23
DE10026615A1 (en) 2001-12-13
EP1410521B1 (en) 2007-10-31

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