BR9807250A - Sistema para uso na compensação de esmaecimento de um sinal am analógico, transmissor e receptor de sinal am analógico para uso na compensação de esmaecimento, e, processo de compensação para o esmaecimento de um sinal am analógico - Google Patents

Sistema para uso na compensação de esmaecimento de um sinal am analógico, transmissor e receptor de sinal am analógico para uso na compensação de esmaecimento, e, processo de compensação para o esmaecimento de um sinal am analógico

Info

Publication number
BR9807250A
BR9807250A BR9807250-1A BR9807250A BR9807250A BR 9807250 A BR9807250 A BR 9807250A BR 9807250 A BR9807250 A BR 9807250A BR 9807250 A BR9807250 A BR 9807250A
Authority
BR
Brazil
Prior art keywords
signal
fading
compensation
time
analog
Prior art date
Application number
BR9807250-1A
Other languages
English (en)
Inventor
Rajaram Ramesh
Sandeep Chennakeshu
Original Assignee
Ericsson 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 Ericsson Inc filed Critical Ericsson Inc
Publication of BR9807250A publication Critical patent/BR9807250A/pt

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/005—Control of transmission; Equalising

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Noise Elimination (AREA)
  • Transmitters (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

"SISTEMA PARA USO NA COMPENSAçãO DE ESMAECIMENTO DE UM SINAL AM ANALóGICO, TRANSMISSOR E RECEPTOR DE SINAL AM ANALóGICO PARA USO NA COMPENSAçãO DE ESMAECIMENTO, E, PROCESSO DE COMPENSAçãO PARA O ESMAECIMENTO DE UM SINAL AM ANALóGICO". Um aparelho e processo de compensação de esmaecimento são fornecidos nos quais os blocos do sinal AM analógico (por exemplo, voz) são comprimidos em tempo em um transmissor (10). Os espaços no sinal comprimido em tempo (15) são preenchidos com símbolos piloto (17) (ou formas de ondas complexas similares) possuindo características conhecidas, tais como amplitudes predeterminadas. O sinal AM analógico comprimido em tempo (por exemplo, SSB ou VSB) é transmitido através do canal de esmaecimento. Em um receptor AM analógico (20), uma estimativa (24) do esmaecimento que ocorreu no canal de transmissão é feita pela observação da amplitude dos símbolos piloto recebidos em pontos separados no tempo, e a interpolação (26) para determinar a quantidade de esmaecimento que ocorreu através do sinal transmitido totasl. Um compensador de esmaecimento (30) compara o sinal comprimido no tempo esmaecido e recebido (28) com os resultados de interpolação (27), e ajusta a amplitude e a fase do sinal recebido de acordo para compensar o esmaecimento que ocorreu no canal de transmissão. O sinal AM analógico compensador é expandido no tempo (32) e enviado para um usuário.
BR9807250-1A 1997-02-19 1998-02-17 Sistema para uso na compensação de esmaecimento de um sinal am analógico, transmissor e receptor de sinal am analógico para uso na compensação de esmaecimento, e, processo de compensação para o esmaecimento de um sinal am analógico BR9807250A (pt)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/802,670 US6085103A (en) 1997-02-19 1997-02-19 Compensating for fading in analog AM radio signals
PCT/US1998/002936 WO1998037644A1 (en) 1997-02-19 1998-02-17 Compensating for fading in analog am radio signals

Publications (1)

Publication Number Publication Date
BR9807250A true BR9807250A (pt) 2000-05-02

Family

ID=25184379

Family Applications (1)

Application Number Title Priority Date Filing Date
BR9807250-1A BR9807250A (pt) 1997-02-19 1998-02-17 Sistema para uso na compensação de esmaecimento de um sinal am analógico, transmissor e receptor de sinal am analógico para uso na compensação de esmaecimento, e, processo de compensação para o esmaecimento de um sinal am analógico

Country Status (10)

Country Link
US (1) US6085103A (pt)
EP (1) EP0962063B1 (pt)
JP (1) JP2001512644A (pt)
CN (1) CN1121761C (pt)
AU (1) AU6167898A (pt)
BR (1) BR9807250A (pt)
CA (1) CA2281726A1 (pt)
DE (1) DE69807190T2 (pt)
TW (1) TW371821B (pt)
WO (1) WO1998037644A1 (pt)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3289676B2 (ja) * 1998-05-28 2002-06-10 日本電気株式会社 パイロット信号を含む受信信号の復調方法及びその装置
US6519300B1 (en) * 1998-11-12 2003-02-11 Ericsson Inc. System and method for automatic frequency correction in a pilot symbol assisted demodulator
KR100318952B1 (ko) * 1999-12-29 2002-01-04 윤종용 무선통신시스템에서 채널 추정을 위한 장치 및 방법
WO2001095496A1 (fr) * 2000-06-06 2001-12-13 Sakai, Yasue Procede et appareil de compression, procede et appareil d'expansion, systeme de compression expansion
US7620368B2 (en) * 2004-03-19 2009-11-17 Qualcomm, Incorporated Systems and techniques for testing a wireless communications device
FR2995115B1 (fr) * 2012-09-04 2014-09-05 Sigfox Procedes d'emission et de reception de donnees dans un systeme de telecommunications numeriques
WO2015125194A1 (ja) 2014-02-21 2015-08-27 パナソニック インテレクチュアル プロパティ コーポレーション オブ アメリカ 送信装置、受信装置、送信方法及び受信方法

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4821097A (en) * 1987-03-05 1989-04-11 General Instrument Corporation Apparatus and method for providing digital audio on the sound carrier of a standard television signal
JPH061908B2 (ja) * 1988-02-02 1994-01-05 郵政省通信総合研究所長 伝送路歪補償方式
US5319801A (en) * 1990-12-05 1994-06-07 Alliedsignal Inc. Seamless frequency hopping system
US5222250A (en) * 1992-04-03 1993-06-22 Cleveland John F Single sideband radio signal processing system
US5428610A (en) * 1992-11-10 1995-06-27 World Communication Ventures, Inc. FM radio system employing time shared wide SCA for digital data band
US5414734A (en) * 1993-01-06 1995-05-09 Glenayre Electronics, Inc. Compensation for multi-path interference using pilot symbols
US5619528A (en) * 1993-04-16 1997-04-08 Trans Video Electronics High speed teleconference system
JP3153869B2 (ja) * 1993-05-11 2001-04-09 株式会社日立国際電気 フェージング歪補償方式及びその回路
FI941072A (fi) * 1994-03-07 1995-09-08 Nokia Mobile Phones Ltd Tiedonsiirtomenetelmä, lähetin sekä vastaanotin
US5809083A (en) * 1994-11-23 1998-09-15 At&T Wireless Services, Inc. Differentially encoded pilot word system and method for wireless transmissions of digital data
US5712877A (en) * 1995-05-26 1998-01-27 Simon Fraser University Pilot-symbol aided continuous phase modulation system
US5901185A (en) * 1996-04-15 1999-05-04 Ericsson Inc. Systems and methods for data-augmented, pilot-symbol-assisted radiotelephone communications
WO1998002936A1 (en) * 1996-07-16 1998-01-22 Qualcomm Incorporated Modified helical antenna
US5912931A (en) * 1996-08-01 1999-06-15 Nextel Communications Method for multicarrier signal detection and parameter estimation in mobile radio communication channels

Also Published As

Publication number Publication date
US6085103A (en) 2000-07-04
TW371821B (en) 1999-10-11
CN1248358A (zh) 2000-03-22
CA2281726A1 (en) 1998-08-27
EP0962063A1 (en) 1999-12-08
WO1998037644A1 (en) 1998-08-27
DE69807190T2 (de) 2003-05-08
JP2001512644A (ja) 2001-08-21
DE69807190D1 (de) 2002-09-19
CN1121761C (zh) 2003-09-17
AU6167898A (en) 1998-09-09
EP0962063B1 (en) 2002-08-14

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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 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 1887 DE 06/03/2007.