BR9714050A - Transmissor para uso em um sistema de comunicação, e, processo para a modulação de um sinal de saìda de um circuito travado em fase em um transmissor de rádio. - Google Patents

Transmissor para uso em um sistema de comunicação, e, processo para a modulação de um sinal de saìda de um circuito travado em fase em um transmissor de rádio.

Info

Publication number
BR9714050A
BR9714050A BR9714050-3A BR9714050A BR9714050A BR 9714050 A BR9714050 A BR 9714050A BR 9714050 A BR9714050 A BR 9714050A BR 9714050 A BR9714050 A BR 9714050A
Authority
BR
Brazil
Prior art keywords
transmitter
phase
dds
pll
output signal
Prior art date
Application number
BR9714050-3A
Other languages
English (en)
Inventor
Bo Sundegord
Original Assignee
Ericsson Telefon Ab L M
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 Telefon Ab L M filed Critical Ericsson Telefon Ab L M
Publication of BR9714050A publication Critical patent/BR9714050A/pt

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C3/00—Angle modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/20—Modulator circuits; Transmitter circuits
    • H04L27/2003—Modulator circuits; Transmitter circuits for continuous phase modulation
    • H04L27/2021—Modulator circuits; Transmitter circuits for continuous phase modulation in which the phase change per symbol period is not constrained
    • H04L27/2025—Modulator circuits; Transmitter circuits for continuous phase modulation in which the phase change per symbol period is not constrained in which the phase changes in a piecewise linear manner within each symbol period

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transmitters (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

"TRANSMISSOR PARA USO EM UM SISTEMA DE COMUNICAçãO, E, PROCESSO PARA A MODULAçãO DE UM SINAL DE SAìDA DE UM CIRCUITO TRAVADO EM FASE EM UM TRANSMISSOR DE RáDIO". Um sistema (10) e processo são fornecidos nos quais um gerador de modulação de fase (12) é utilizado para modular o sinal de saída de um DDS (18) com um índice de modulação, h/N. A saída DDS modulada em fase aciona um PLL (26), que é um estágio de conversão ascendente para um transmissor de rádio, com o sinal DDS modulado como referência do PLL (26). A saída do PLL (26) terá um índice de modulação de h. Consequentemente, a banda de freq³ência da saída DDS (18) é significativamente mais estreita do que a banda de freq³ência dos estágios de conversão ascendente utilizados nos transmissores convencionais, e existem significativamente menos emissões espúrias no sinal transmitido. Entretanto, um transmissor empregando a presente topologia PLL acionado por DDS modulado em fase ainda pode transmitir através de uma banda de freq³ência relativamente larga.
BR9714050-3A 1996-12-20 1997-12-16 Transmissor para uso em um sistema de comunicação, e, processo para a modulação de um sinal de saìda de um circuito travado em fase em um transmissor de rádio. BR9714050A (pt)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/771,632 US5834985A (en) 1996-12-20 1996-12-20 Digital continuous phase modulation for a DDS-driven phase locked loop
PCT/SE1997/002121 WO1998028852A2 (en) 1996-12-20 1997-12-16 Continuous phase modulator, comprising a direct digital synthesizer followed by a phase locked loop

Publications (1)

Publication Number Publication Date
BR9714050A true BR9714050A (pt) 2000-05-09

Family

ID=25092470

Family Applications (1)

Application Number Title Priority Date Filing Date
BR9714050-3A BR9714050A (pt) 1996-12-20 1997-12-16 Transmissor para uso em um sistema de comunicação, e, processo para a modulação de um sinal de saìda de um circuito travado em fase em um transmissor de rádio.

Country Status (9)

Country Link
US (1) US5834985A (pt)
EP (1) EP0944960B1 (pt)
KR (1) KR20000069646A (pt)
CN (1) CN1245596A (pt)
AU (1) AU724122B2 (pt)
BR (1) BR9714050A (pt)
CA (1) CA2275589A1 (pt)
DE (1) DE69712092T2 (pt)
WO (1) WO1998028852A2 (pt)

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Also Published As

Publication number Publication date
WO1998028852A2 (en) 1998-07-02
WO1998028852A3 (en) 1998-11-26
EP0944960B1 (en) 2002-04-17
AU724122B2 (en) 2000-09-14
AU5502298A (en) 1998-07-17
DE69712092D1 (de) 2002-05-23
EP0944960A2 (en) 1999-09-29
KR20000069646A (ko) 2000-11-25
CN1245596A (zh) 2000-02-23
US5834985A (en) 1998-11-10
CA2275589A1 (en) 1998-07-02
DE69712092T2 (de) 2002-10-10

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Legal Events

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

Free format text: REFERENTE A 6A,7A E 8A 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 1836 DE 14/03/2006.