WO2001071930A3 - Methods, system and apparatus for precompensating for interface among transmitted coded cdma signals - Google Patents

Methods, system and apparatus for precompensating for interface among transmitted coded cdma signals Download PDF

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Publication number
WO2001071930A3
WO2001071930A3 PCT/US2001/007523 US0107523W WO0171930A3 WO 2001071930 A3 WO2001071930 A3 WO 2001071930A3 US 0107523 W US0107523 W US 0107523W WO 0171930 A3 WO0171930 A3 WO 0171930A3
Authority
WO
WIPO (PCT)
Prior art keywords
information symbol
code
interference
coded signal
generated
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/US2001/007523
Other languages
French (fr)
Other versions
WO2001071930A2 (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 DE60111031T priority Critical patent/DE60111031D1/en
Priority to AT01918470T priority patent/ATE296502T1/en
Priority to EP01918470A priority patent/EP1266460B1/en
Priority to AU2001245546A priority patent/AU2001245546A1/en
Publication of WO2001071930A2 publication Critical patent/WO2001071930A2/en
Publication of WO2001071930A3 publication Critical patent/WO2001071930A3/en
Anticipated expiration legal-status Critical
Ceased 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
    • 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
    • H04B2201/7097—Direct sequence modulation interference
    • H04B2201/709709—Methods of preventing interference

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)

Abstract

In a communications system such as a wireless code division multiple access (CDMA) communications system, an interference-compensated information symbol (rn2(t)) is generated from a source information symbol based on knowledge of an information symbol (d11(t)) and a first code (Q11(t)) used to generate a first coded signal. The first coded signal and a second coded signal representing the interference-compensated information symbol encoded according to a second code are then concurrently transmitted. In one embodiment, a composite signal is generated from at least one information symbol according to at least one code from a first group of codes of a set of quasi-orthogonal codes. An interference-compensated information symbol is then generated from a source information symbol, the composite signal and a code from a second group of codes of the set of quasi-orthogonal codes. The second coded signal represents the interference-compensated information symbol encoded according to the code from the second group, and is transmitted concurrently with transmission of the first coded signal. Preferably, the interference-compensated information symbol is generated by integrating (523) a product (521) of the composite signal and the complex conjugate of the code from the second group over a symbol interval (T), scaling the integrated product by a scaling factor, and subtracting (524) the scaled integrated product from the source information symbol to generate the interference-compensated information symbol (rn2(t)).
PCT/US2001/007523 2000-03-21 2001-03-09 Methods, system and apparatus for precompensating for interface among transmitted coded cdma signals Ceased WO2001071930A2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE60111031T DE60111031D1 (en) 2000-03-21 2001-03-09 METHODS, SYSTEMS AND APPARATUS FOR PRESENTING INTERFERENCE INTO CODED, SENT CDMA SIGNALS
AT01918470T ATE296502T1 (en) 2000-03-21 2001-03-09 METHOD, SYSTEMS AND DEVICE FOR THE PRE-EQUALIZATION OF INTERFERENCES IN CODED, TRANSMITTED CDMA SIGNALS
EP01918470A EP1266460B1 (en) 2000-03-21 2001-03-09 Methods, systems and apparatus for precompensating for interference among transmitted coded cdma signals
AU2001245546A AU2001245546A1 (en) 2000-03-21 2001-03-09 Methods, systems and apparatus for precompensating for interference among transmitted coded signals

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/532,357 2000-03-21
US09/532,357 US6973063B1 (en) 2000-03-21 2000-03-21 Methods, systems and apparatus for precompensating for interference among transmitted coded signals

Publications (2)

Publication Number Publication Date
WO2001071930A2 WO2001071930A2 (en) 2001-09-27
WO2001071930A3 true WO2001071930A3 (en) 2002-02-28

Family

ID=24121444

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2001/007523 Ceased WO2001071930A2 (en) 2000-03-21 2001-03-09 Methods, system and apparatus for precompensating for interface among transmitted coded cdma signals

Country Status (6)

Country Link
US (1) US6973063B1 (en)
EP (1) EP1266460B1 (en)
AT (1) ATE296502T1 (en)
AU (1) AU2001245546A1 (en)
DE (1) DE60111031D1 (en)
WO (1) WO2001071930A2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7133353B2 (en) * 2001-01-08 2006-11-07 Telefonaktiebolaget Lm Ericsson (Publ) CDMA system using quasi-orthogonal codes
KR100895183B1 (en) * 2006-02-03 2009-04-24 삼성전자주식회사 Transmitting/receiving method and apparatus canceling other cell interference in wireless communication systems
US8320352B2 (en) * 2007-03-02 2012-11-27 Qualcomm Incorporated Robust transmission scheme for wireless networks

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999049596A1 (en) * 1998-03-26 1999-09-30 Samsung Electronics Co., Ltd. Device and method for controlling powers of orthogonal channel and quasi-orthogonal channel in cdma communication system
DE19818215A1 (en) * 1998-04-24 1999-11-18 Bosch Gmbh Robert Method for the transmission of data and device for the transmission of data

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3349861B2 (en) * 1995-03-17 2002-11-25 富士通株式会社 Wireless LAN system
US5740165A (en) * 1996-02-29 1998-04-14 Lucent Technologies Inc. Wireless TDMA transmitter with reduced interference
US5805567A (en) * 1996-09-13 1998-09-08 Lucent Technologies Inc. Orthogonal modulation scheme
US6067291A (en) * 1997-09-23 2000-05-23 Lucent Technologies Inc. Wireless local area network with enhanced carrier sense provision
US6332006B1 (en) * 1998-11-18 2001-12-18 Ericsson Inc. Apparatus and methods for providing high-penetration messaging in wireless communications systems
US6501788B1 (en) * 1999-01-22 2002-12-31 Ericsson Inc. Apparatus and methods for intereference cancellation in spread spectrum communications systems
US6067290A (en) * 1999-07-30 2000-05-23 Gigabit Wireless, Inc. Spatial multiplexing in a cellular network
US6515980B1 (en) * 1999-09-22 2003-02-04 Ericsson Inc. Methods and apparatus for interference cancellation using complex interference orthogonalization techniques
US6683924B1 (en) * 1999-10-19 2004-01-27 Ericsson Inc. Apparatus and methods for selective correlation timing in rake receivers

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999049596A1 (en) * 1998-03-26 1999-09-30 Samsung Electronics Co., Ltd. Device and method for controlling powers of orthogonal channel and quasi-orthogonal channel in cdma communication system
DE19818215A1 (en) * 1998-04-24 1999-11-18 Bosch Gmbh Robert Method for the transmission of data and device for the transmission of data

Also Published As

Publication number Publication date
US6973063B1 (en) 2005-12-06
WO2001071930A2 (en) 2001-09-27
ATE296502T1 (en) 2005-06-15
EP1266460B1 (en) 2005-05-25
EP1266460A2 (en) 2002-12-18
DE60111031D1 (en) 2005-06-30
AU2001245546A1 (en) 2001-10-03

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