AR014748A1 - Modulador de amplitud de cuadratura digital - Google Patents

Modulador de amplitud de cuadratura digital

Info

Publication number
AR014748A1
AR014748A1 ARP990101211A ARP990101211A AR014748A1 AR 014748 A1 AR014748 A1 AR 014748A1 AR P990101211 A ARP990101211 A AR P990101211A AR P990101211 A ARP990101211 A AR P990101211A AR 014748 A1 AR014748 A1 AR 014748A1
Authority
AR
Argentina
Prior art keywords
modulator
qam
reduction
modulation
multipliers
Prior art date
Application number
ARP990101211A
Other languages
English (en)
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 AR014748A1 publication Critical patent/AR014748A1/es

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

Un modulador de amplitud de cuadratura digital que permite que desde 6 a 8 canales comprimidos independientes ocupen una amplitud de bandas de 6 MHz almismo tiempo que reduce la potencia de procesamiento en un 33% para 8 niveles de modulacionofre cidos por un 64-QAM y en un 25% para 16 niveles de modulacionofrecidos por un 256-QAM. El modulador logra esta eficiencia usando una arquitectura mejorada de filtrador digital que combina la modulacion y lafiltracion con una combinacionporta dora de filtro. El modulador QAM presentado se implementa con una reduccion de la cantidad total de multiplicadoresparalelos binarios. Para aumentar el rendimiento operacional, la velocidad de operacion se incrementa con el uso de LUTs(tablas de r egistro) que almacenancoeficientes ponderados de filtrado pre-computados. La reduccion de los multiplicadores se logra también usando una combinacion portadora depost-filtrado que reduce de manera similar la cantidad deoperaciones MAC efectuadas durante la filtracion. La invencion puede construirse como un FPGA(disposicion de puerta de campo programable) o un ASIC (circuito integrado específico de aplicacion).
ARP990101211A 1998-03-19 1999-03-19 Modulador de amplitud de cuadratura digital AR014748A1 (es)

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
AR014748A1 true AR014748A1 (es) 2001-03-28

Family

ID=21934243

Family Applications (1)

Application Number Title Priority Date Filing Date
ARP990101211A AR014748A1 (es) 1998-03-19 1999-03-19 Modulador de amplitud de cuadratura digital

Country Status (10)

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

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US6141387A (en) * 1998-03-19 2000-10-31 Motorola, Inc. Digital QAM modulator using post filtering carrier recombination
US6647069B1 (en) * 1998-05-01 2003-11-11 Texas Instruments Incorporated Method and apparatus for capacity increase and enhanced communications performance in CATV networks
DE19946722A1 (de) 1999-09-29 2001-04-05 Infineon Technologies Ag Einrichtung und Verfahren zur spektralen Formung eines Sendesignals in einem Funksender
GB0010284D0 (en) * 2000-04-27 2000-06-14 Ifr Limited Signal generating methods and apparatus
US7016296B2 (en) * 2000-10-16 2006-03-21 Broadcom Corporation Adaptive modulation for fixed wireless link in cable transmission system
US7590178B2 (en) * 2001-03-12 2009-09-15 Robert Bosch Gmbh Method of multiplexing a number of video signals with a compressor
US6973141B1 (en) 2001-10-04 2005-12-06 Wideband Semiconductors, Inc. Flexible multimode QAM modulator
AU2003217947A1 (en) 2002-03-08 2003-09-22 Quellan, Inc. High speed analog-to-digital converter using a unique gray code having minimal bit transitions
AU2003256569A1 (en) 2002-07-15 2004-02-02 Quellan, Inc. Adaptive noise filtering and equalization
KR20050053611A (ko) * 2002-08-14 2005-06-08 코닌클리즈케 필립스 일렉트로닉스 엔.브이. 송신기, 프로세서 시스템, 패킷 데이터 송신 방법 및 프로세서 프로그램 제품
US7379509B2 (en) * 2002-08-19 2008-05-27 Lawrence Livermore National Security, Llc Digital intermediate frequency QAM modulator using parallel processing
AU2003287628A1 (en) 2002-11-12 2004-06-03 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
CA2516427A1 (en) * 2003-02-28 2004-09-16 Rgb Networks, Inc. Cost-effective multi-channel quadrature amplitude modulation
US6983024B2 (en) * 2003-03-18 2006-01-03 Qualcomm Inc. Quadra-polar modulator
EP1616401A4 (en) * 2003-04-21 2012-01-04 Rgb Networks Inc TIME-MULTIPROUGH MULTIPROGRAM ENCRYPTION SYSTEM
CA2523118C (en) * 2003-04-21 2013-06-04 Rgb Networks, Inc. Wideband multi-channel quadrature amplitude modulation of cable television signals
US7110726B1 (en) * 2003-05-22 2006-09-19 Quake Global, Inc. RF ASIC for subscriber communicator
US7515651B1 (en) * 2003-08-07 2009-04-07 L3 Communications Corporation Parallel processing for programmable wideband digital modulation
JP2007502054A (ja) 2003-08-07 2007-02-01 ケラン インコーポレイテッド クロストークキャンセルのための方法とシステム
US7804760B2 (en) 2003-08-07 2010-09-28 Quellan, Inc. Method and system for signal emulation
CA2537293C (en) 2003-08-29 2014-04-01 Rgb Networks, Inc. Advanced, adaptive video multiplexer system
EP1687929B1 (en) 2003-11-17 2010-11-10 Quellan, Inc. Method and system for antenna interference cancellation
US7616700B2 (en) 2003-12-22 2009-11-10 Quellan, Inc. Method and system for slicing a communication signal
US7522883B2 (en) 2004-12-14 2009-04-21 Quellan, Inc. Method and system for reducing signal interference
US7725079B2 (en) 2004-12-14 2010-05-25 Quellan, Inc. Method and system for automatic control in an interference cancellation device
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
US8269569B2 (en) * 2008-02-21 2012-09-18 Advantest Corporation Test apparatus for digital modulated signal
US8947207B2 (en) 2008-04-29 2015-02-03 Quake Global, 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
US9841492B2 (en) 2013-02-25 2017-12-12 Quake Global, Inc. Ceiling-mounted RFID-enabled tracking
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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GB8505527D0 (en) * 1985-03-04 1985-04-03 Digital Equipment Corp Digitally implemented modulators
US5315617A (en) * 1992-05-29 1994-05-24 General Electric Company QAM encoding for high-definition television system
GB9219185D0 (en) * 1992-09-10 1992-10-28 Thomson Consumer Electronics A single digital modem encoder to generate a twin qam signal for advanced digital television (adtv)
US5666378A (en) * 1994-03-18 1997-09-09 Glenayre Electronics, Inc. High performance modem using pilot symbols for equalization and frame synchronization
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US5692013A (en) * 1995-11-07 1997-11-25 Hitachi America, Ltd. Shared resources modulator-demodulator circuits for use with quadrature amplitude modulated signals
JPH1023096A (ja) * 1996-07-02 1998-01-23 Fujitsu Ltd ディジタル変調器および復調器
US6141387A (en) * 1998-03-19 2000-10-31 Motorola, Inc. Digital QAM modulator using post filtering carrier recombination

Also Published As

Publication number Publication date
CN100387034C (zh) 2008-05-07
US6141387A (en) 2000-10-31
KR100646456B1 (ko) 2006-11-14
TW401691B (en) 2000-08-11
EP0944215A2 (en) 1999-09-22
KR19990078048A (ko) 1999-10-25
CA2263244C (en) 2002-02-19
AU1847799A (en) 1999-10-07
CA2263244A1 (en) 1999-09-19
BR9901017A (pt) 2000-05-09
AU748388B2 (en) 2002-06-06
EP0944215A3 (en) 2001-05-16
US6430228B1 (en) 2002-08-06
CN1239365A (zh) 1999-12-22
JPH11331298A (ja) 1999-11-30

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