BR9810430A - Sincronizador e método para ele e sistema de comunicações incorporando o mesmo - Google Patents

Sincronizador e método para ele e sistema de comunicações incorporando o mesmo

Info

Publication number
BR9810430A
BR9810430A BR9810430-6A BR9810430A BR9810430A BR 9810430 A BR9810430 A BR 9810430A BR 9810430 A BR9810430 A BR 9810430A BR 9810430 A BR9810430 A BR 9810430A
Authority
BR
Brazil
Prior art keywords
user
spreaders
spreading code
displacement
communications system
Prior art date
Application number
BR9810430-6A
Other languages
English (en)
Inventor
Thomas R Giallorenzi
Samuel C Kingston
Robert W Steagall
Patrick J Smith
Steven T Barham
Original Assignee
L 3 Comm Corp
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 L 3 Comm Corp filed Critical L 3 Comm Corp
Publication of BR9810430A publication Critical patent/BR9810430A/pt

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B15/00—Suppression or limitation of noise or interference
    • 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
    • H04B1/7085—Synchronisation aspects using a code tracking loop, e.g. a delay-locked loop

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
  • Radio Relay Systems (AREA)

Abstract

Patente de Invenção: <B>"SINCRONIZADOR E MéTODO PARA ELE E SISTEMA DE COMUNICAçõES INCORPORANDO O MESMO"<D>. Usuários ou assinantes (36) de um sistema de comunicações síncrono de espectro espalhado provêm sinais para a estação central ou unidade de base (30) daquele sistema, e recebem sinais dele. é necessária sincronização apropriada entre aqueles usuários (e seus sinais) para garantir operação apropriada do sistema. Para garantir sincronização apropriada entre aqueles usuários, o sinal produzido por cada usuário é verificado para a presença e quantidade de qualquer erro de deslocamento. Isto é realizado usando três desespalhadores (42, 44 e 46) para o sinal de cada usuário. Para um tal usuário (36), cada um de tais desespalhadores para aquele usuário, recebe o código de espalhamento (50) para aquele usuário. No entanto, o código de espalhamento como recebido por qualquer um de tais desespalhadores é atrasado em tempo (52 e 54) com respeito ao código de espalhamento (50), como recebido pelos outros dois desespalhadores. Cada um de tais desespalhadores recebe o código de espalhamento com quantidades diferentes de atraso imposto sobre aquele código de espalhamento. As saídas dos três desespalhadores (42, 44 e 46) são combinadas digitalmente (66), ou comparadas, para produzir a estimativa de deslocamento para aquele usuário (70). Para reduzir efeitos de ruído, é realizada a média da estimativa de deslocamento por uma duração predeterminada de tempo, alternativamente, tal média pode ser realizada nas saídas dos desespalhadores, ou em alguma etapa de processamento intermediária. A estimativa de deslocamento é enviada para o usuário, para ser usada para corrigir a sincronização daquele usuário. Estimativas de deslocamento que são muito pequenas para serem úteis são silenciadas e não são assim enviadas para o usuário, para reduzir o uso do canal e desta forma economizar largura de banda.
BR9810430-6A 1997-06-10 1998-06-09 Sincronizador e método para ele e sistema de comunicações incorporando o mesmo BR9810430A (pt)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/872,398 US5867525A (en) 1997-06-10 1997-06-10 Synchronizer and method therefor and communications system incorporating same
PCT/US1998/011222 WO1998057453A1 (en) 1997-06-10 1998-06-09 Synchronizer and method therefor and communications system incorporating same

Publications (1)

Publication Number Publication Date
BR9810430A true BR9810430A (pt) 2000-09-19

Family

ID=25359493

Family Applications (1)

Application Number Title Priority Date Filing Date
BR9810430-6A BR9810430A (pt) 1997-06-10 1998-06-09 Sincronizador e método para ele e sistema de comunicações incorporando o mesmo

Country Status (9)

Country Link
US (2) US5867525A (pt)
EP (1) EP0988726A4 (pt)
JP (1) JP2002508903A (pt)
KR (1) KR20010013556A (pt)
CN (1) CN1260089A (pt)
AU (1) AU7807598A (pt)
BR (1) BR9810430A (pt)
IL (1) IL133367A0 (pt)
WO (1) WO1998057453A1 (pt)

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US8537656B2 (en) * 2000-07-19 2013-09-17 Ipr Licensing, Inc. Method for compensating for multi-path of a CDMA reverse link utilizing an orthogonal channel structure
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US7831002B2 (en) * 2006-10-11 2010-11-09 The Boeing Company System, apparatus and method for synchronizing a spreading sequence transmitted during a plurality of time slots
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Also Published As

Publication number Publication date
CN1260089A (zh) 2000-07-12
AU7807598A (en) 1998-12-30
US5867525A (en) 1999-02-02
JP2002508903A (ja) 2002-03-19
EP0988726A1 (en) 2000-03-29
EP0988726A4 (en) 2003-04-23
KR20010013556A (ko) 2001-02-26
US6332008B1 (en) 2001-12-18
IL133367A0 (en) 2001-04-30
WO1998057453A1 (en) 1998-12-17

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Legal Events

Date Code Title Description
B08F Application dismissed because of non-payment of annual fees [chapter 8.6 patent gazette]

Free format text: REFERENTE A 5A,6A,7A,8A E 9A ANUIDADES.

B08K Patent lapsed as no evidence of payment of the annual fee has been furnished to inpi [chapter 8.11 patent gazette]

Free format text: REFERENTE AO DESPACHO 8.6 PUBLICADO NA RPI 1909 DE 07/08/2007.