BR0002750A - Método e aparelho para diversidade de enlace descendente em cdma usando código walsh - Google Patents

Método e aparelho para diversidade de enlace descendente em cdma usando código walsh

Info

Publication number
BR0002750A
BR0002750A BR0002750-2A BR0002750A BR0002750A BR 0002750 A BR0002750 A BR 0002750A BR 0002750 A BR0002750 A BR 0002750A BR 0002750 A BR0002750 A BR 0002750A
Authority
BR
Brazil
Prior art keywords
walsh codes
mobile
transmit antennas
downlink diversity
transmit
Prior art date
Application number
BR0002750-2A
Other languages
English (en)
Inventor
R Michael Buehrer
Robert Atmaram Soni
Jiann-An Tsai
Original Assignee
Lucent Technologies 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 Lucent Technologies Inc filed Critical Lucent Technologies Inc
Publication of BR0002750A publication Critical patent/BR0002750A/pt

Links

Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G3/00—Cutting implements specially adapted for horticultural purposes; Delimbing standing trees
    • A01G3/02—Secateurs; Flower or fruit shears
    • A01G3/033—Secateurs; Flower or fruit shears having motor-driven blades
    • A01G3/037—Secateurs; Flower or fruit shears having motor-driven blades the driving means being an electric motor
    • 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
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G3/00—Cutting implements specially adapted for horticultural purposes; Delimbing standing trees
    • A01G3/02—Secateurs; Flower or fruit shears
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G3/00—Cutting implements specially adapted for horticultural purposes; Delimbing standing trees
    • A01G3/02—Secateurs; Flower or fruit shears
    • A01G3/033—Secateurs; Flower or fruit shears having motor-driven blades
    • 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
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • 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
    • H04J13/0077—Multicode, e.g. multiple codes assigned to one user
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/16—Code allocation
    • H04J13/18—Allocation of orthogonal codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H04L1/0618—Space-time 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
    • H04B2201/7097—Direct sequence modulation interference
    • H04B2201/709709—Methods of preventing interference

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Ecology (AREA)
  • Forests & Forestry (AREA)
  • Environmental Sciences (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radio Transmission System (AREA)
  • Ultra Sonic Daignosis Equipment (AREA)
  • Error Detection And Correction (AREA)

Abstract

<B>MéTODOS E APARELHO PARA DIVERSIDADE DE ENLACE DESCENDENTE EM CDMA USANDO CóDIGOS WALSH <D>Diversidade de enlace descendente em um sistema de CDMA é provida mediante emprego de códigos Walsh em conjunto com M antenas de transmissão em uma estação de base comum servindo K estações móveis, onde M pode ou não ser igual a K. A presente invenção proporciona métodos e aparelhos para aperfeiçoar diversidade de enlace descendente em um sistema de CDMA. Cada antena de transmissão transmite um sinal representando o resultado da modulação dos códigos Walsh por sinais de dados para cada uma das K estações móveis, considerando que há dados pertencentes a uma estação móvel específica. A atribuição de códigos Walsh é realizada de acordo com uma matriz T de transmissão. A matriz de transmissão converte os símbolos de dados de usuário em códigos Walsh para cada antena e é projetada preferivelmente de tal modo que suas colunas são representativas das antenas de transmissão e são ortogonais. Assim, em uma estação móvel determinada, a estação móvel precisa apenas correlacionar-se com M códigos walsh diferentes uma vez que cada sinal de transmissão recebido contém um componente que é o resultado de M códigos Walsh diferentes tendo sido modulados por um sinal de dados associado àquela estação móvel específica. O conjunto de códigos Walsh dos quais se faz a seleção inclui 2^ [log2(k)] ^ códigos Walsh. Contudo, com relação a qualquer estação móvel determinada, são necessários apenas tantos códigos Walsh diferentes quantas são as antenas de transmissão servindo a estação móvel específica. Os resultados das M correlações respectivas são combinados e, com estimativas obtidas de canal, o receptor avalia os dados específicos pertencendo àquela estação móvel específica de modo que os mesmos podem ser providos ao usuário. Além disso, a presente invenção proporciona várias formas de avaliar os canais respectivos entre M antenas de transmissão e estação móvel. Deve ser considerado que as técnicas de diversidade de enlace descendente da invenção podem ser aplicadas à camada física proposta na proposição de projeto de camada física do IS95-C.
BR0002750-2A 1999-04-19 2000-04-12 Método e aparelho para diversidade de enlace descendente em cdma usando código walsh BR0002750A (pt)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US09/294,661 US6515978B1 (en) 1999-04-19 1999-04-19 Methods and apparatus for downlink diversity in CDMA using Walsh codes

Publications (1)

Publication Number Publication Date
BR0002750A true BR0002750A (pt) 2001-01-30

Family

ID=23134378

Family Applications (1)

Application Number Title Priority Date Filing Date
BR0002750-2A BR0002750A (pt) 1999-04-19 2000-04-12 Método e aparelho para diversidade de enlace descendente em cdma usando código walsh

Country Status (11)

Country Link
US (2) US6515978B1 (pt)
EP (2) EP1047218B1 (pt)
JP (1) JP4046456B2 (pt)
KR (1) KR100556006B1 (pt)
CN (1) CN1271219A (pt)
AT (1) ATE331356T1 (pt)
AU (1) AU2778100A (pt)
BR (1) BR0002750A (pt)
CA (1) CA2304532C (pt)
DE (1) DE60028857T2 (pt)
ID (1) ID25575A (pt)

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Also Published As

Publication number Publication date
EP1047218A3 (en) 2003-09-10
DE60028857T2 (de) 2006-12-07
CA2304532A1 (en) 2000-10-19
AU2778100A (en) 2000-10-26
US7400614B2 (en) 2008-07-15
EP1047218B1 (en) 2006-06-21
CA2304532C (en) 2007-06-26
KR20000077044A (ko) 2000-12-26
JP4046456B2 (ja) 2008-02-13
US20030081656A1 (en) 2003-05-01
EP1047218A2 (en) 2000-10-25
EP1523120A3 (en) 2016-08-03
ID25575A (id) 2000-10-19
KR100556006B1 (ko) 2006-03-03
EP1523120A2 (en) 2005-04-13
ATE331356T1 (de) 2006-07-15
JP2001028559A (ja) 2001-01-30
CN1271219A (zh) 2000-10-25
DE60028857D1 (de) 2006-08-03
US6515978B1 (en) 2003-02-04

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