AR022371A1 - Metodo y aparato para reducir las variaciones de amplitud e interferencia en senales de comunicacion, tales como en senales de comunicacion inalambricasque utilizan simbolos piloto insertados - Google Patents

Metodo y aparato para reducir las variaciones de amplitud e interferencia en senales de comunicacion, tales como en senales de comunicacion inalambricasque utilizan simbolos piloto insertados

Info

Publication number
AR022371A1
AR022371A1 ARP990104340A ARP990104340A AR022371A1 AR 022371 A1 AR022371 A1 AR 022371A1 AR P990104340 A ARP990104340 A AR P990104340A AR P990104340 A ARP990104340 A AR P990104340A AR 022371 A1 AR022371 A1 AR 022371A1
Authority
AR
Argentina
Prior art keywords
pilot symbols
implementation
communication signals
chip
wireless communication
Prior art date
Application number
ARP990104340A
Other languages
English (en)
Original Assignee
Qualcomm 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 Qualcomm Inc filed Critical Qualcomm Inc
Publication of AR022371A1 publication Critical patent/AR022371A1/es

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
    • H04B1/76—Pilot transmitters or receivers for control of transmission or for equalising
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • 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
    • 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
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/0007—Code type
    • H04J13/004—Orthogonal
    • H04J13/0048—Walsh
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/10—Code generation
    • H04J13/12—Generation of orthogonal codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2614—Peak power aspects
    • H04L27/2615—Reduction thereof using coding
    • 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
    • H04B2201/70701—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation featuring pilot assisted reception
    • 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
    • H04B2201/70706—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation with means for reducing the peak-to-average power ratio
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/0007—Code type
    • H04J13/004—Orthogonal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L2025/03777—Arrangements for removing intersymbol interference characterised by the signalling

Abstract

Varios métodos y aparatos correspondientes reducen la potencia pico a promedio en senales transmitidas en un sistema de comunicaciones inalámbrico,particularmente con respecto a símbolos piloto transmitidos desde una estacion base a varias estacionesusuarias. Se ha encontrado que una gran amplitud picopromedio de símbolos piloto insertados resulta de una posicion de partícula (chip) comun que existe en los codigos ortogonales, tales como los codigos Walsh.En una primera implementacion los codigos Walsh son multiplicados por un valor aleatorio de +/- 1. En una segunda implementacion, la posicion de partícula(chip) de signo comun es eliminada en cada codigo Walsh. La estacion usuaria entonces inserta la posicion de partícula (chip) faltantepara recuperar laortogonalidad. En una tercera implementacion, la estacion base transmite símbolos piloto, en un canal piloto separado, solamente en las posiciones de símbolodonde las estaciones usuarias esperan encontrar símbolos piloto. En una cuarta implementacion, cada codigo Walsh es desplazado en forma aleatoria.
ARP990104340A 1998-08-31 1999-08-30 Metodo y aparato para reducir las variaciones de amplitud e interferencia en senales de comunicacion, tales como en senales de comunicacion inalambricasque utilizan simbolos piloto insertados AR022371A1 (es)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US09/144,402 US6310869B1 (en) 1998-08-31 1998-08-31 Method and apparatus for reducing amplitude variations and interference in communication signals, such as in wireless communication signals employing inserted pilot symbols

Publications (1)

Publication Number Publication Date
AR022371A1 true AR022371A1 (es) 2002-09-04

Family

ID=22508421

Family Applications (1)

Application Number Title Priority Date Filing Date
ARP990104340A AR022371A1 (es) 1998-08-31 1999-08-30 Metodo y aparato para reducir las variaciones de amplitud e interferencia en senales de comunicacion, tales como en senales de comunicacion inalambricasque utilizan simbolos piloto insertados

Country Status (12)

Country Link
US (2) US6310869B1 (es)
EP (2) EP1110360B1 (es)
JP (1) JP4191388B2 (es)
KR (1) KR100697510B1 (es)
CN (1) CN1186888C (es)
AR (1) AR022371A1 (es)
AT (2) ATE400956T1 (es)
AU (1) AU5589299A (es)
DE (2) DE69928269T2 (es)
ES (1) ES2251221T3 (es)
HK (1) HK1040014B (es)
WO (1) WO2000013337A2 (es)

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Also Published As

Publication number Publication date
EP1613013B1 (en) 2008-07-09
JP4191388B2 (ja) 2008-12-03
DE69939078D1 (de) 2008-08-21
DE69928269T2 (de) 2006-07-13
CN1325583A (zh) 2001-12-05
EP1110360A2 (en) 2001-06-27
DE69928269D1 (de) 2005-12-15
EP1613013A1 (en) 2006-01-04
EP1110360B1 (en) 2005-11-09
KR100697510B1 (ko) 2007-03-20
HK1040014A1 (en) 2002-05-17
US6310869B1 (en) 2001-10-30
US20020021683A1 (en) 2002-02-21
KR20010074910A (ko) 2001-08-09
ES2251221T3 (es) 2006-04-16
AU5589299A (en) 2000-03-21
ATE309662T1 (de) 2005-11-15
WO2000013337A2 (en) 2000-03-09
CN1186888C (zh) 2005-01-26
JP2002524911A (ja) 2002-08-06
HK1040014B (zh) 2005-08-05
ATE400956T1 (de) 2008-07-15
WO2000013337A3 (en) 2000-06-08

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