BR0005815A - Despropagação e detecção de preâmbulo de sequência de códigos em um receptor cdma - Google Patents

Despropagação e detecção de preâmbulo de sequência de códigos em um receptor cdma

Info

Publication number
BR0005815A
BR0005815A BR0005815-7A BR0005815A BR0005815A BR 0005815 A BR0005815 A BR 0005815A BR 0005815 A BR0005815 A BR 0005815A BR 0005815 A BR0005815 A BR 0005815A
Authority
BR
Brazil
Prior art keywords
fht
strings
preamble
ogc
code
Prior art date
Application number
BR0005815-7A
Other languages
English (en)
Inventor
David Lahiri Bhatoolaul
Pantelis Monogioudis
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 BR0005815A publication Critical patent/BR0005815A/pt

Links

Classifications

    • 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
    • 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
    • H04B1/7073—Synchronisation aspects
    • H04B1/7075—Synchronisation aspects with code phase acquisition

Abstract

<B>DESPROPAGAçãO E DETECçãO DE PREâMBULO DE SEQuêNCIA DE CóDIGOS EM UM RECEPTOR CDMA<D> Um receptor em um sistema de comunicações de acesso múltiplo por divisão de código (CDMA) utiliza um detector de preâmbulo para canais de acesso aleatório (por exemplo, RACHs). RACHs podem utilizar seq³ências de código Gold ortogonais (OGC) para seq³ências de assinaturas de preâmbulo e/ou propagação da seq³ência de assinaturas de preâmbulo com seq³ências OGC. Um detector de preâmbulo pode utilizar uma transformada rápida ortogonal Gold (FOGT) tanto para despropagar (por exemplo, correlação com números de código C1,...,C256)) como para gerar uma estatística de decisão para detectar (identificar) a seq³ência de assinaturas utilizadas no preâmbulo. O sinal propagado do RACH é aplicado a um filtro casado de códigos (CMF) casado com a seq³ência OGC de propagação e o sinal de saída do CMF é amostrado à taxa de símbolos. Uma transformada rápida de Hadamaard (FHT) é aplicada à saída amostrada do CMF, e as palavras de código exemplificativas de ordem 16 do FHT coincidem com as 16 seq³ências de assinaturas Walsh utilizadas para distinguir canais de usuários transmitidos pelo equipamento do usuário. Uma transformada rápida OGC (FOGT) pode ser aplicada à saída amostrada do CMF se as seq³ências OGC forem usadas como seq³ências de assinaturas. Os sinais gerados pelo FHT podem ser divididos em dois ramos para processamento: um ramo de referência e um ramo de dados. O ramo de referência processa os sinais gerados pelo FHT para estimar as características de resposta de canal, propiciar um sinal de de-rotação e efetuar aquisição de freq³ências se necessário. No caso do ramo de referência, a amplitude elevada ao quadrado de cada sinal de vetor de FHT complexo de extensão 16 é calculada e o valor máximo é estabelecido como índice i, onde i <sym>{1,...,16}. O índice máximo i é utilizado como uma estatística preliminar de decisão não coerente correspondente ao valor de índice da seq³ência de assinaturas Walsh utilizada para o sinal propagado do canal de acesso. O índice i do ramo de referência pode ser então usado por: 1) um gerador Walsh para reproduzir a seq³ência de assinaturas Walsh (BPSK); 2) um seletor para selecionar um dos 16 sinais de saída de FHT para estimar características de resposta de canal; e 3) como uma estatística de decisão não coerente para processamento subseq³ente pelo detector.
BR0005815-7A 1999-12-15 2000-12-08 Despropagação e detecção de preâmbulo de sequência de códigos em um receptor cdma BR0005815A (pt)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP99310117A EP1109326A1 (en) 1999-12-15 1999-12-15 Peamble detector for a CDMA receiver

Publications (1)

Publication Number Publication Date
BR0005815A true BR0005815A (pt) 2001-07-24

Family

ID=8241814

Family Applications (1)

Application Number Title Priority Date Filing Date
BR0005815-7A BR0005815A (pt) 1999-12-15 2000-12-08 Despropagação e detecção de preâmbulo de sequência de códigos em um receptor cdma

Country Status (8)

Country Link
US (1) US7076015B2 (pt)
EP (1) EP1109326A1 (pt)
JP (1) JP2001230703A (pt)
KR (1) KR20010062426A (pt)
CN (1) CN1196272C (pt)
AU (1) AU748875B2 (pt)
BR (1) BR0005815A (pt)
CA (1) CA2325649A1 (pt)

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Also Published As

Publication number Publication date
CN1310524A (zh) 2001-08-29
EP1109326A1 (en) 2001-06-20
AU748875B2 (en) 2002-06-13
US20010017881A1 (en) 2001-08-30
JP2001230703A (ja) 2001-08-24
CN1196272C (zh) 2005-04-06
CA2325649A1 (en) 2001-06-15
AU7208800A (en) 2001-06-28
US7076015B2 (en) 2006-07-11
KR20010062426A (ko) 2001-07-07

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