BR9901396A - Geração de sinal de modulação operada por tabela - Google Patents

Geração de sinal de modulação operada por tabela

Info

Publication number
BR9901396A
BR9901396A BR9901396-7A BR9901396A BR9901396A BR 9901396 A BR9901396 A BR 9901396A BR 9901396 A BR9901396 A BR 9901396A BR 9901396 A BR9901396 A BR 9901396A
Authority
BR
Brazil
Prior art keywords
modulation signal
values
complex
modulation
filter output
Prior art date
Application number
BR9901396-7A
Other languages
English (en)
Inventor
Robert Chuelin Wang
Original Assignee
Lucent Technologies 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 Lucent Technologies Inc filed Critical Lucent Technologies Inc
Publication of BR9901396A publication Critical patent/BR9901396A/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
    • 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
    • H04L27/2032—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner
    • H04L27/2053—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases
    • H04L27/206—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases using a pair of orthogonal carriers, e.g. quadrature carriers
    • H04L27/2067—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases using a pair of orthogonal carriers, e.g. quadrature carriers with more than two phase states
    • H04L27/2071—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases using a pair of orthogonal carriers, e.g. quadrature carriers with more than two phase states in which the data are represented by the carrier phase, e.g. systems with differential coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03828—Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties
    • H04L25/03834—Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties using pulse shaping

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Power Engineering (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

GERAçãO DE SINAL DE MODULAçãO OPERADA POR TABELA. Pares de bits em uma seq³ência de dados de entrada são convertidos em um sinal de modulação (por exemplo, um sinal de modulação <SYM>/4-DQPSK) utilizando uma técnica que baseia-se nos valores de saída de filtro pré-computados para reduzir o processamento exigido para gerar cada amostra no sinal de modulação. Os valores pré-computados de saída de filtro são armazenados em uma ou mais tabelas de consulta, as quais são acessadas em tempo real durante conversão de sinal para recuperar valores quando necessário. Em uma implementação, os dibits, que são representados por valores complexos em um espaço de símbolo complexo, são convertidos em duas seq³ências de variáveis de estado: uma seq³ência para os símbolos pares e uma seq³ência para os símbolos ímpares. As duas seq³ências de variáveis de estado são utilizadas para gerar indicadores de endereço que são usados para acessar valores pré-computados de saída de filtro a partir das tabelas de consulta. Operações de adição/subtração são então aplicadas aos valores recuperados para gerar as partes real e imaginária das amostras complexas no sinal de modulação. Reduzindo-se grandemente as computações envolvidas nas geração de cada amostra complexa no sinal de modulação, a presente invenção pode ser usada para reduzir os custos de implementar o processo de modulação e/ou aumentar a taxa na qual a seq³ência de dados de entrada é superamostrada, dessa forma reduzindo a distorção no sinal de modulação.
BR9901396-7A 1998-05-05 1999-04-23 Geração de sinal de modulação operada por tabela BR9901396A (pt)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US09/072,813 US6194977B1 (en) 1998-05-05 1998-05-05 State variable-based table-driven modulation signal generation

Publications (1)

Publication Number Publication Date
BR9901396A true BR9901396A (pt) 2000-06-13

Family

ID=22109913

Family Applications (1)

Application Number Title Priority Date Filing Date
BR9901396-7A BR9901396A (pt) 1998-05-05 1999-04-23 Geração de sinal de modulação operada por tabela

Country Status (8)

Country Link
US (1) US6194977B1 (pt)
EP (1) EP0955752A2 (pt)
JP (1) JP2000032070A (pt)
KR (1) KR19990088048A (pt)
CN (1) CN1238623A (pt)
AU (1) AU2691399A (pt)
BR (1) BR9901396A (pt)
CA (1) CA2266870A1 (pt)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6611567B1 (en) * 1999-01-29 2003-08-26 Agere Systems, Inc. Method and apparatus for pulse shaping
US6258065B1 (en) * 1999-03-26 2001-07-10 Core Dynamics, Inc. Surgical instrument seal assembly
US7248646B1 (en) * 2002-04-19 2007-07-24 Analog Devices Inc. Digital reconfigurable core for multi-mode base-band transmitter
US7605724B2 (en) * 2005-01-14 2009-10-20 Marvell World Trade Ltd. Method and apparatus for a transmission signal up-converting filter
US8441752B1 (en) * 2006-08-30 2013-05-14 Marvell International Ltd. Dibit pulse extraction methods and systems
CN103873409B (zh) * 2012-12-12 2019-01-08 北京普源精电科技有限公司 一种产生π/4-DQPSK调制信号的调制器、信号发生器及方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9218009D0 (en) * 1992-08-25 1992-10-14 Philips Electronics Uk Ltd A method of,and transmitter for,transmitting a digital signal
US5604770A (en) * 1994-10-13 1997-02-18 Hewlett-Packard Company PI/4 DQPSK modulation with coarse mapper precession and fine filter precession
US5768317A (en) * 1995-05-08 1998-06-16 National Semiconductor Corporation Equalization filter compensating for distortion in a surface acoustic wave device
US5512865A (en) * 1995-05-08 1996-04-30 National Semiconductor Corporation Digital oversampled quadrature modulator

Also Published As

Publication number Publication date
JP2000032070A (ja) 2000-01-28
AU2691399A (en) 1999-11-11
KR19990088048A (ko) 1999-12-27
EP0955752A2 (en) 1999-11-10
CA2266870A1 (en) 1999-11-05
CN1238623A (zh) 1999-12-15
US6194977B1 (en) 2001-02-27

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Legal Events

Date Code Title Description
FA10 Dismissal: dismissal - article 33 of industrial property law
B11Y Definitive dismissal acc. article 33 of ipl - extension of time limit for request of examination expired