BR9901017A - Modulador qam digital utilizando recombinaçao de portadora pós-filtração. - Google Patents

Modulador qam digital utilizando recombinaçao de portadora pós-filtração.

Info

Publication number
BR9901017A
BR9901017A BR9901017-8A BR9901017A BR9901017A BR 9901017 A BR9901017 A BR 9901017A BR 9901017 A BR9901017 A BR 9901017A BR 9901017 A BR9901017 A BR 9901017A
Authority
BR
Brazil
Prior art keywords
post
filtration
qam
modulator
modulation
Prior art date
Application number
BR9901017-8A
Other languages
English (en)
Inventor
Quin Zhang
Original Assignee
Gen Instrument 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 Gen Instrument Corp filed Critical Gen Instrument Corp
Publication of BR9901017A publication Critical patent/BR9901017A/pt

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/36—Modulator circuits; Transmitter circuits
    • H04L27/362—Modulation using more than one carrier, e.g. with quadrature carriers, separately amplitude modulated
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/36—Modulator circuits; Transmitter circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Amplitude Modulation (AREA)

Abstract

<B> MODULADOR QAM DIGITAL UTILIZANDO RECOMBINAçãO DE PORTADORA PóS-FILTRAçãO <D> O modulador de amplitude de quadratura eficiente da presente invenção permite que de 6 a 8 canais comprimidos independentes ocupem uma largura de faixa de 6 MHz enquanto reduzindo poder de processamento em 33 por centro para 8 níveis de modulação oferecida por 64-QAM e em 25 por centro para 16 níveis de modulação oferecida por 256-QAM. O modulador obtém esta eficiência utilizando uma arquitetura de filtro digital, aperfeiçoada, combinando a modulação e filtração com combinação de portadora pós-filtração. O modulador QAM apresentado é implementado com uma redução no número total de multiplicadores paralelos binários. Para aumentar o rendimento operacional, a velocidade de operação aumenta com o uso de LUTs (tabelas de consulta) armazenando coeficientes de ponderação de filtro pré-computados. A redução em multiplicadores também é obtida pelo uso de combinação de portadora pós-filtração que reduz similarmente o número de operações MAC realizadas durante filtração. A invenção pode ser construída como um FPGA (conjunto de porta programável em campo) ou um ASIC (circuito integrado específico de aplicação).
BR9901017-8A 1998-03-19 1999-03-17 Modulador qam digital utilizando recombinaçao de portadora pós-filtração. BR9901017A (pt)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US09/044,769 US6141387A (en) 1998-03-19 1998-03-19 Digital QAM modulator using post filtering carrier recombination

Publications (1)

Publication Number Publication Date
BR9901017A true BR9901017A (pt) 2000-05-09

Family

ID=21934243

Family Applications (1)

Application Number Title Priority Date Filing Date
BR9901017-8A BR9901017A (pt) 1998-03-19 1999-03-17 Modulador qam digital utilizando recombinaçao de portadora pós-filtração.

Country Status (10)

Country Link
US (2) US6141387A (pt)
EP (1) EP0944215A3 (pt)
JP (1) JPH11331298A (pt)
KR (1) KR100646456B1 (pt)
CN (1) CN100387034C (pt)
AR (1) AR014748A1 (pt)
AU (1) AU748388B2 (pt)
BR (1) BR9901017A (pt)
CA (1) CA2263244C (pt)
TW (1) TW401691B (pt)

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JP2005536136A (ja) * 2002-08-14 2005-11-24 コーニンクレッカ　フィリップス　エレクトロニクス　エヌ　ヴィ データの許容伝送遅延に従って２つの異なる符号化方式及び対応する変調方式の間で選択する方式
AU2003265557A1 (en) * 2002-08-19 2004-03-03 The Regents Of The University Of California Fpga implementation of a digital qam modulator
WO2004045078A2 (en) 2002-11-12 2004-05-27 Quellan, Inc. High-speed analog-to-digital conversion with improved robustness to timing uncertainty
JP4158852B2 (ja) * 2002-11-19 2008-10-01 富士通テレコムネットワークス株式会社 多重ｑａｍ復調装置
JP4390710B2 (ja) * 2002-11-27 2009-12-24 アールジービー・ネットワークス・インコーポレイテッド 複数のデジタルビデオプログラムの時間多重化処理のための方法及び装置
US7170956B1 (en) 2003-01-15 2007-01-30 Wideband Semiconductors, Inc Frequency agile tuner and variable rate decimator for digital demodulator
JP2006520576A (ja) * 2003-02-28 2006-09-07 アールジービー・ネットワークス・インコーポレイテッド コストの安い多重チャネル直交振幅変調
US6983024B2 (en) * 2003-03-18 2006-01-03 Qualcomm Inc. Quadra-polar modulator
CN1778062A (zh) * 2003-04-21 2006-05-24 Rgb网络有限公司 时分复用多程序加密系统
EP1616424A4 (en) * 2003-04-21 2009-12-02 Rgb Networks Inc MULTICHANNEL QUADRATURE AMPLITUDE MODULATION WITH WIDE BAND OF CABLE TELEVISION SIGNALS
US7110726B1 (en) * 2003-05-22 2006-09-19 Quake Global, Inc. RF ASIC for subscriber communicator
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US7515651B1 (en) * 2003-08-07 2009-04-07 L3 Communications Corporation Parallel processing for programmable wideband digital modulation
CA2537293C (en) 2003-08-29 2014-04-01 Rgb Networks, Inc. Advanced, adaptive video multiplexer system
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US7616700B2 (en) 2003-12-22 2009-11-10 Quellan, Inc. Method and system for slicing a communication signal
US7725079B2 (en) 2004-12-14 2010-05-25 Quellan, Inc. Method and system for automatic control in an interference cancellation device
US7522883B2 (en) 2004-12-14 2009-04-21 Quellan, Inc. Method and system for reducing signal interference
WO2007127369A2 (en) 2006-04-26 2007-11-08 Quellan, Inc. Method and system for reducing radiated emissions from a communications channel
US8379755B2 (en) * 2006-05-05 2013-02-19 Samsung Electronics Co., Ltd. RF transmitter with adaptive digital filtering
DE102007013423B4 (de) * 2007-03-20 2012-07-12 Siemens Ag Verfahren zur Erzeugung eines digital modulierten Hochfrequenzsignals
JPWO2009104420A1 (ja) * 2008-02-21 2011-06-23 株式会社アドバンテスト デジタル変調信号の試験装置ならびにデジタル変調器、デジタル復調器、これらを用いた半導体装置
TW201001958A (en) 2008-04-29 2010-01-01 Odin Technologies Inc Method and apparatus for a deployable radio-frequency identification portal system
WO2010117363A1 (en) * 2009-04-09 2010-10-14 Michelin Recherche Et Technique, S.A. Tire metallic cable anomaly detection method and apparatus
US9246725B2 (en) * 2011-09-06 2016-01-26 Electronics And Telecommunications Research Institute Method of generating and receiving packets in low energy critical infrastructure monitoring system
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CA2902912C (en) 2013-02-26 2022-02-01 Quake Global, Inc. Methods and apparatus for automatic identification wristband
CN103873425B (zh) * 2014-03-12 2017-02-08 中国人民解放军重庆通信学院 2*‑qam信号的产生方法
CN105282074A (zh) * 2015-11-03 2016-01-27 上海创远仪器技术股份有限公司 应用于射频微波信号源的数字化幅度调制方法

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Also Published As

Publication number Publication date
EP0944215A3 (en) 2001-05-16
EP0944215A2 (en) 1999-09-22
AU1847799A (en) 1999-10-07
JPH11331298A (ja) 1999-11-30
US6141387A (en) 2000-10-31
KR100646456B1 (ko) 2006-11-14
CN100387034C (zh) 2008-05-07
AU748388B2 (en) 2002-06-06
KR19990078048A (ko) 1999-10-25
US6430228B1 (en) 2002-08-06
TW401691B (en) 2000-08-11
AR014748A1 (es) 2001-03-28
CA2263244A1 (en) 1999-09-19
CN1239365A (zh) 1999-12-22
CA2263244C (en) 2002-02-19

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Legal Events

Date Code Title Description
B08F Application fees: application dismissed [chapter 8.6 patent gazette]

Free format text: REFERENTE AO NAO RECOLHIMENTO DA(S) 8A, 9A E 10A ANUIDADE(S).

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 PUBLICADO NA RPI 1990 DE 25/02/2009.