BR9702149B1 - laço e método de rastreamento de frequência para um sistema de comunicação que usa modulação walsh m-aria ortogonal para gerar sinais de comunicação. - Google Patents

laço e método de rastreamento de frequência para um sistema de comunicação que usa modulação walsh m-aria ortogonal para gerar sinais de comunicação.

Info

Publication number
BR9702149B1
BR9702149B1 BRPI9702149-0A BR9702149A BR9702149B1 BR 9702149 B1 BR9702149 B1 BR 9702149B1 BR 9702149 A BR9702149 A BR 9702149A BR 9702149 B1 BR9702149 B1 BR 9702149B1
Authority
BR
Brazil
Prior art keywords
correlator
frequency tracking
frequency
modulation
communication system
Prior art date
Application number
BRPI9702149-0A
Other languages
English (en)
Portuguese (pt)
Other versions
BR9702149A (pt
Inventor
Avneesh Agrawal
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 filed Critical
Publication of BR9702149A publication Critical patent/BR9702149A/pt
Publication of BR9702149B1 publication Critical patent/BR9702149B1/pt

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
    • H04B1/7073—Synchronisation aspects
    • H04B1/7075—Synchronisation aspects with code phase acquisition
    • 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
    • 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
    • H04B1/709—Correlator structure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H04L2027/0044—Control loops for carrier regulation
    • H04L2027/0063—Elements of loops
    • H04L2027/0065—Frequency error detectors

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
BRPI9702149-0A 1996-03-29 1997-03-26 laço e método de rastreamento de frequência para um sistema de comunicação que usa modulação walsh m-aria ortogonal para gerar sinais de comunicação. BR9702149B1 (pt)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/625,481 US6330291B1 (en) 1996-03-29 1996-03-29 Frequency tracking for communication signals using M-ary orthogonal walsh modulation
PCT/US1997/006379 WO1997037437A1 (en) 1996-03-29 1997-03-26 Frequency tracking for communication signals using m-ary orthogonal walsh modulation

Publications (2)

Publication Number Publication Date
BR9702149A BR9702149A (pt) 1999-07-20
BR9702149B1 true BR9702149B1 (pt) 2011-03-09

Family

ID=24506294

Family Applications (1)

Application Number Title Priority Date Filing Date
BRPI9702149-0A BR9702149B1 (pt) 1996-03-29 1997-03-26 laço e método de rastreamento de frequência para um sistema de comunicação que usa modulação walsh m-aria ortogonal para gerar sinais de comunicação.

Country Status (12)

Country Link
US (1) US6330291B1 (enExample)
EP (1) EP0829146B1 (enExample)
JP (1) JP3860213B2 (enExample)
KR (1) KR100470000B1 (enExample)
CN (1) CN1168229C (enExample)
AT (1) ATE290269T1 (enExample)
AU (1) AU727941B2 (enExample)
BR (1) BR9702149B1 (enExample)
CA (1) CA2222644C (enExample)
DE (1) DE69732595T2 (enExample)
RU (1) RU2234197C2 (enExample)
WO (1) WO1997037437A1 (enExample)

Families Citing this family (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6134260A (en) * 1997-12-16 2000-10-17 Ericsson Inc. Method and apparatus for frequency acquisition and tracking for DS-SS CDMA receivers
US6563858B1 (en) 1998-01-16 2003-05-13 Intersil Americas Inc. Method of performing antenna diversity in spread spectrum in wireless local area network
DE19846870C1 (de) * 1998-10-12 2001-01-25 Peter Peyerl Verfahren zur Bestimmung der Impulsantwort eines breitbandigen linearen Systems und Meßanordnung zur Durchführung des Verfahrens
FR2795257A1 (fr) * 1999-06-15 2000-12-22 Koninkl Philips Electronics Nv Detecteur de phase pour systeme de transmission a etalement de spectre
US6977974B1 (en) * 2000-11-20 2005-12-20 At&T Corp. De-modulation of MOK(M-ary orthogonal modulation)
US8385470B2 (en) * 2000-12-05 2013-02-26 Google Inc. Coding a signal with a shuffled-Hadamard function
US8374218B2 (en) 2000-12-05 2013-02-12 Google Inc. Combining signals with a shuffled-hadamard function
JP4572482B2 (ja) * 2001-04-11 2010-11-04 株式会社デンソー Ｃｄｍａ方式の無線通信機の復調装置
FI110725B (fi) 2001-04-20 2003-03-14 Nokia Corp Menetelmä vastaanottimen tahdistamisessa ja vastaanotin
US6552996B2 (en) * 2001-09-18 2003-04-22 Interdigital Communications Corporation OVSF code system and methods
KR100534592B1 (ko) * 2002-06-20 2005-12-07 한국전자통신연구원 디지털 통신 시스템의 수신 장치 및 그 방법
US6795486B2 (en) * 2002-09-23 2004-09-21 Thomson Licensing S.A. Variable-length correlator for spread-spectrum communications
US7787357B2 (en) * 2003-12-18 2010-08-31 Motorola, Inc. OFDM frequency offset estimation apparatus and method
US8189705B2 (en) * 2004-11-12 2012-05-29 Intel Corporation Method and apparatus to perform equalization and decoding for a communication system
US8139685B2 (en) 2005-05-10 2012-03-20 Qualcomm Incorporated Systems, methods, and apparatus for frequency control
KR100821938B1 (ko) * 2006-04-14 2008-04-15 삼성전자주식회사 무선통신시스템에서 상향링크 주파수 옵셋 추정 장치 및방법
KR100947604B1 (ko) * 2007-12-17 2010-03-15 한국전자통신연구원 이동통신 시스템에서 2차 루프 필터를 사용하는 주파수오차 추정기 및 그 동작방법
US9071493B2 (en) * 2009-06-29 2015-06-30 Qualcomm Incorporated Dual frequency tracking loop for OFDMA systems
JP5621476B2 (ja) * 2010-09-29 2014-11-12 ソニー株式会社 同期回路、同期方法、および受信システム
CN111614373B (zh) * 2020-05-20 2021-08-10 北京升哲科技有限公司 扩频信号发送、扩频信号接收方法、装置、设备及介质
CN114389640B (zh) * 2022-01-17 2023-05-30 深圳华海尖兵科技有限公司 复杂信号条件下的调制及解调方法、装置及电子设备

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4494238A (en) * 1982-06-30 1985-01-15 Motorola, Inc. Multiple channel data link system
US4841544A (en) 1987-05-14 1989-06-20 The Charles Stark Draper Laboratory, Inc. Digital direct sequence spread spectrum receiver
NZ232222A (en) * 1989-01-27 1993-03-26 British Telecomm Alternate burst communication for cordless phones: burst formats
IL100213A (en) * 1990-12-07 1995-03-30 Qualcomm Inc CDMA microcellular telephone system and distributed antenna system therefor
US5357454A (en) 1991-07-25 1994-10-18 Ericsson Ge Mobile Communications Holding, Inc. Fast walsh transform processor
US5687166A (en) * 1992-11-24 1997-11-11 Stanford Telecommunications, Inc. Modulation system for spread spectrum CDMA communication
US5822318A (en) * 1994-07-29 1998-10-13 Qualcomm Incorporated Method and apparatus for controlling power in a variable rate communication system
US5619524A (en) * 1994-10-04 1997-04-08 Motorola, Inc. Method and apparatus for coherent communication reception in a spread-spectrum communication system
US5608722A (en) * 1995-04-03 1997-03-04 Qualcomm Incorporated Multi-user communication system architecture with distributed receivers
US5623487A (en) * 1995-05-19 1997-04-22 Stanford Telecommunications, Inc. Doubly orthogonal code and frequency division multiple access communication system
US5764630A (en) * 1996-03-25 1998-06-09 Stanford Telecommunications, Inc. Forward link carrier recovery in an OCDMA spread spectrum communication system without a pilot tone

Also Published As

Publication number Publication date
AU2673197A (en) 1997-10-22
AU727941B2 (en) 2001-01-04
JPH11506598A (ja) 1999-06-08
EP0829146A1 (en) 1998-03-18
KR100470000B1 (ko) 2005-03-16
DE69732595T2 (de) 2006-01-12
CN1168229C (zh) 2004-09-22
DE69732595D1 (de) 2005-04-07
BR9702149A (pt) 1999-07-20
KR19990022148A (ko) 1999-03-25
CA2222644C (en) 2005-06-28
ATE290269T1 (de) 2005-03-15
RU2234197C2 (ru) 2004-08-10
CA2222644A1 (en) 1997-10-09
US6330291B1 (en) 2001-12-11
JP3860213B2 (ja) 2006-12-20
CN1185873A (zh) 1998-06-24
WO1997037437A1 (en) 1997-10-09
EP0829146B1 (en) 2005-03-02
HK1010957A1 (en) 1999-07-02

Similar Documents

Publication Publication Date Title
BR9702149A (pt) Rastreamento de frequéncia para sinais de comunicação usando modulação de walsh ortogonal m-aria
WO2006043057A3 (en) Optical correlation apparatus and method
US20240426640A1 (en) Integrated system for optical fiber sensing and communication through sharing co-frequency resources
CA2137460A1 (en) Method and Apparatus for Power Estimation in an Orthogonal Coded Communication System
Maragos Morphological correlation and mean absolute error criteria
ATE188076T1 (de) Spreizspektrumkorrelator
ATE333170T1 (de) Quadraturmultiplexierung zweier durch verschiedene pn-sequenzen gespreizter datensignale
US4028490A (en) MSK digital data synchronization detector
WO1992000502A3 (en) Demodulation reference signal source
MX9709266A (es) Busqueda de frecuencia para señales de comunicacion que utilizan modulacion walsh ortogonal m-aria.
EP0144538A3 (en) A trigonometric transform function generator
CA2495414A1 (en) Frequency tracking for communications signals using m-ary orthogonal walsh modulation
CN114826422B (zh) 一种适用于自由空间的激光时间频率同时传递系统
JPS56102143A (en) Spectrum diffusion communication system
Zhang et al. Optical domain despreading method of optical time-domain reflectometer using spread spectrum technology
EP1004954A1 (en) Optical device for processing digital optical signals
PT1071249E (pt) Processo e dispositivo de modulacao num emissor
CN120785710A (zh) 基于fdma信号调制的水声通信定位一体信号设计与处理方法、介质和装置
NL7403957A (nl) Spreidings spectrum communicatietechniek, waarbij gebruik wordt gemaakt van veel- voudige overdracht en meervoudige toegang.
SU681571A1 (ru) Устройство дл формировани случайного синхронного телеграфного сигнала
RU2002130833A (ru) Способ передачи информации в системах оптической связи
Bradley et al. Digital polarisation modulation with multiquantum well asymmetric Fabry-Perot structures
Argon et al. Detection of shortened OOC codewords in optical CDMA systems with double hard-limiters
JPS57184346A (en) Spectrum spreading communication system and receiving device
Fraile‐Peláez Analytical signal formalism in the description of optical pulse photodetection

Legal Events

Date Code Title Description
B06A Patent application procedure suspended [chapter 6.1 patent gazette]
B09A Decision: intention to grant [chapter 9.1 patent gazette]
B16A Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]

Free format text: PRAZO DE VALIDADE: 10 (DEZ) ANOS CONTADOS A PARTIR DE 09/03/2011, OBSERVADAS AS CONDICOES LEGAIS.

B24H Lapse because of non-payment of annual fees (definitively: art 78 iv lpi)
B24F Patent annual fee: publication cancelled

Free format text: ANULADA A PUBLICACAO CODIGO 24.8 NA RPI NO 2259 DE 22/04/2014 POR TER SIDO INDEVIDA.

B21F Lapse acc. art. 78, item iv - on non-payment of the annual fees in time

Free format text: REFERENTE AS 15A, 16A, 17A, 18A, 19A, 20A, 21A, 22A E 23A ANUIDADES.

B24J Lapse because of non-payment of annual fees (definitively: art 78 iv lpi, resolution 113/2013 art. 12)

Free format text: EM VIRTUDE DA EXTINCAO PUBLICADA NA RPI 2607 DE 22-12-2020 E CONSIDERANDO AUSENCIA DE MANIFESTACAO DENTRO DOS PRAZOS LEGAIS, INFORMO QUE CABE SER MANTIDA A EXTINCAO DA PATENTE E SEUS CERTIFICADOS, CONFORME O DISPOSTO NO ARTIGO 12, DA RESOLUCAO 113/2013.