ES2113876T3 - Demodulacion sustractiva de señales cdma. - Google Patents

Demodulacion sustractiva de señales cdma.

Info

Publication number
ES2113876T3
ES2113876T3 ES91850314T ES91850314T ES2113876T3 ES 2113876 T3 ES2113876 T3 ES 2113876T3 ES 91850314 T ES91850314 T ES 91850314T ES 91850314 T ES91850314 T ES 91850314T ES 2113876 T3 ES2113876 T3 ES 2113876T3
Authority
ES
Spain
Prior art keywords
signal
composite signal
signals
composite
recoded
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.)
Expired - Lifetime
Application number
ES91850314T
Other languages
English (en)
Inventor
Paul W Dent
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
Ericsson GE Mobile Communications Holding 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, Ericsson GE Mobile Communications Holding Inc filed Critical Ericsson Inc
Application granted granted Critical
Publication of ES2113876T3 publication Critical patent/ES2113876T3/es
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H04B1/71072—Successive 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
    • H04B1/7103—Interference-related aspects the interference being multiple access interference
    • H04B1/7107—Subtractive interference cancellation
    • H04B2001/71077—Partial 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
    • H04B2201/70703—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation using multiple or variable rates

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Stereo-Broadcasting Methods (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Small-Scale Networks (AREA)
  • Radio Relay Systems (AREA)
  • Noise Elimination (AREA)
  • Graft Or Block Polymers (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
  • Breeding Of Plants And Reproduction By Means Of Culturing (AREA)
  • Investigating Or Analysing Biological Materials (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Error Detection And Correction (AREA)

Abstract

UNA DESMODULACION CDMA SUSTRACTIVA DESCODIFICA OPTIMAMENTE UNA SEÑAL DE INFORMACION CODIFICADA INCLUIDA EN MUCHAS OTRAS SEÑALES SUPERPUESTAS FORMANDO UNA SEÑAL COMPUESTA RECIBIDA. UN RECEPTOR DE RADIO CORRELACIONA UN CODIGO UNICO CORRESPONDIENTE A LA SEÑAL QUE SE DESEA DESCODIFICAR CON LA SEÑAL COMPUESTA. ADEMAS, DESPUES DE QUE CADA SEÑAL DE INFORMACION ES DESCODIFICADA CON EXITO, SE VUELVE A CODIFICAR Y SEPARAR DE LA SEÑAL COMPUESTA. COMO RESULTADO, SE REALIZAN CORRELACIONES SUBSIGUIENTES CON MAYOR PRECISION. LA DESMODULACION CDMA SUSTRACTIVA SE AUMENTA DESCODIFICANDO LA SEÑAL COMPUESTA EN ORDEN DE FUERZA DE SEÑAL MAYOR A MENOR . LA INTERFERENCIA CAUSADA POR LA PRESENCIA DE LA SEÑAL DE INFORMACION MAS FUERTE Y LA SEÑAL COMPUESTA DURANTE LA DESCODIFICACION DE LAS SEÑALES MAS DEBILES QUEDA ELIMINADA. CADA UNA DE LAS SEÑALES DE INFORMACION SE ASIGNA A UN CODIGO DE CORRECCION DE ERROR DE BLOQUE UNICO QUE SE CORRELACIONA CON LA SEÑAL COMPUESTA UTILIZANDO TRANSFORMACIONES FAST WALSH. LAS SEÑALESCORRELACIONADAS SE RECODIFICAN UTILIZANDO TRANSFORMACIONES FAST WALSH INVERTIDAS Y SE ELIMINAN DE LA SEÑAL COMPUESTA.
ES91850314T 1990-12-17 1991-12-12 Demodulacion sustractiva de señales cdma. Expired - Lifetime ES2113876T3 (es)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US07/628,359 US5151919A (en) 1990-12-17 1990-12-17 Cdma subtractive demodulation

Publications (1)

Publication Number Publication Date
ES2113876T3 true ES2113876T3 (es) 1998-05-16

Family

ID=24518547

Family Applications (1)

Application Number Title Priority Date Filing Date
ES91850314T Expired - Lifetime ES2113876T3 (es) 1990-12-17 1991-12-12 Demodulacion sustractiva de señales cdma.

Country Status (19)

Country Link
US (1) US5151919A (es)
EP (1) EP0491668B1 (es)
JP (1) JP3081642B2 (es)
AT (1) ATE163336T1 (es)
AU (1) AU645646B2 (es)
BR (1) BR9106226A (es)
CA (1) CA2076006C (es)
DE (1) DE69128927T2 (es)
DK (1) DK0491668T3 (es)
ES (1) ES2113876T3 (es)
FI (1) FI108589B (es)
GR (1) GR3026244T3 (es)
HK (1) HK1009366A1 (es)
MX (1) MX9102562A (es)
MY (1) MY107860A (es)
RU (1) RU2104615C1 (es)
SG (1) SG49656A1 (es)
UA (1) UA41256C2 (es)
WO (1) WO1992011716A1 (es)

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FI923678A0 (fi) 1992-08-17
EP0491668A2 (en) 1992-06-24
AU645646B2 (en) 1994-01-20
DE69128927T2 (de) 1998-06-04
UA41256C2 (uk) 2001-09-17
RU2104615C1 (ru) 1998-02-10
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EP0491668A3 (en) 1992-12-30
WO1992011716A1 (en) 1992-07-09
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CA2076006A1 (en) 1992-06-18
US5151919A (en) 1992-09-29
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DK0491668T3 (da) 1998-09-23
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FI108589B (fi) 2002-02-15
DE69128927D1 (de) 1998-03-26
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EP0491668B1 (en) 1998-02-18
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FI923678A (fi) 1992-08-17
JP3081642B2 (ja) 2000-08-28
HK1009366A1 (en) 1999-05-28
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CA2076006C (en) 2001-08-07
JPH05507397A (ja) 1993-10-21

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