BR0004033A - Método e aparelho para reduzir potência de canal adjacente em sistemas de comunicação sem fio - Google Patents

Método e aparelho para reduzir potência de canal adjacente em sistemas de comunicação sem fio

Info

Publication number
BR0004033A
BR0004033A BR0004033-9A BR0004033A BR0004033A BR 0004033 A BR0004033 A BR 0004033A BR 0004033 A BR0004033 A BR 0004033A BR 0004033 A BR0004033 A BR 0004033A
Authority
BR
Brazil
Prior art keywords
adjacent channel
wireless communication
communication systems
channel power
amplifier
Prior art date
Application number
BR0004033-9A
Other languages
English (en)
Inventor
Robert Everest Johnson
George Philip Vella-Coleiro
Mark Thomas Leney
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 BR0004033A publication Critical patent/BR0004033A/pt

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7097—Interference-related aspects
    • 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
    • H04L27/366—Arrangements for compensating undesirable properties of the transmission path between the modulator and the demodulator
    • H04L27/367—Arrangements for compensating undesirable properties of the transmission path between the modulator and the demodulator using predistortion
    • H04L27/368—Arrangements for compensating undesirable properties of the transmission path between the modulator and the demodulator using predistortion adaptive predistortion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/62—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for providing a predistortion of the signal in the transmitter and corresponding correction in the receiver, e.g. for improving the signal/noise ratio

Landscapes

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

Abstract

<B>MéTODO E APARELHO PARA REDUZIR POTêNCIA DE CANAL ADJACENTE EM SISTEMAS DE COMUNICAçãO SEM FIO<D> A presente invenção refere-se a um método e aparelho para reduzir potência de canal adjacente em sistemas de comunicação sem fio. Mais particularmente, a presente invenção é dirigida a um sistema para pré-distorcer de forma digital e adaptável um sinal que inclui aplicar uma correção ao sinal antes que o mesmo seja aplicado à entrada de um amplificador de tal modo que a correção seja igual e oposta à distorção prevista produzida pelo amplificador. Desse modo, a correção e a distorção de amplificador anulam-se mutuamente, resultando em um sistema com uma característica de transferência linear global. Nestas circunstâncias, a potência de canal adjacente é desejavelmente reduzida.
BR0004033-9A 1999-09-14 2000-09-06 Método e aparelho para reduzir potência de canal adjacente em sistemas de comunicação sem fio BR0004033A (pt)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US09/395,490 US7409007B1 (en) 1999-09-14 1999-09-14 Method and apparatus for reducing adjacent channel power in wireless communication systems

Publications (1)

Publication Number Publication Date
BR0004033A true BR0004033A (pt) 2001-04-17

Family

ID=23563261

Family Applications (1)

Application Number Title Priority Date Filing Date
BR0004033-9A BR0004033A (pt) 1999-09-14 2000-09-06 Método e aparelho para reduzir potência de canal adjacente em sistemas de comunicação sem fio

Country Status (9)

Country Link
US (1) US7409007B1 (pt)
EP (1) EP1085668B1 (pt)
JP (1) JP4676052B2 (pt)
KR (1) KR100739356B1 (pt)
CN (1) CN1288341A (pt)
AU (1) AU773197B2 (pt)
BR (1) BR0004033A (pt)
CA (1) CA2317901C (pt)
DE (1) DE60044485D1 (pt)

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US7251293B2 (en) * 2003-06-27 2007-07-31 Andrew Corporation Digital pre-distortion for the linearization of power amplifiers with asymmetrical characteristics
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KR101145830B1 (ko) * 2008-10-29 2012-05-17 주식회사 케이제이티 전치왜곡장치 및 간섭억제시스템 필터-유닛이 적용된 이동통신장치의 출력단
US8358680B2 (en) * 2008-12-23 2013-01-22 Apple Inc. Reducing power levels associated with two or more signals using peak reduction distortion that is derived from a combined signal
JP5244698B2 (ja) * 2009-05-18 2013-07-24 アイコム株式会社 送信電力制御装置及び送信電力制御方法
CN103597807B (zh) 2010-09-14 2015-09-30 大理系统有限公司 远程可重新配置的分布式天线系统和方法
US8711976B2 (en) 2011-05-12 2014-04-29 Andrew Llc Pre-distortion architecture for compensating non-linear effects
US8792572B1 (en) * 2013-05-30 2014-07-29 Telefonaktiebolaget L M Ericsson (Publ) Universal peak power reduction in communication radios
JP2015142325A (ja) 2014-01-30 2015-08-03 富士通株式会社 歪補償装置および歪補償方法
EP3682682A1 (en) * 2017-09-11 2020-07-22 Telefonaktiebolaget LM Ericsson (Publ) Transmit power control in a wireless communications network
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Also Published As

Publication number Publication date
EP1085668B1 (en) 2010-06-02
CA2317901A1 (en) 2001-03-14
AU773197B2 (en) 2004-05-20
KR20010050450A (ko) 2001-06-15
CN1288341A (zh) 2001-03-21
AU5655400A (en) 2001-03-15
EP1085668A3 (en) 2003-09-03
KR100739356B1 (ko) 2007-07-18
EP1085668A2 (en) 2001-03-21
DE60044485D1 (de) 2010-07-15
US7409007B1 (en) 2008-08-05
CA2317901C (en) 2011-04-19
JP4676052B2 (ja) 2011-04-27
JP2001127819A (ja) 2001-05-11

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B15K Others concerning applications: alteration of classification

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Ipc: H04B 1/04 (2006.01), H04B 1/62 (2006.01)

B07A Application suspended after technical examination (opinion) [chapter 7.1 patent gazette]
B09B Patent application refused [chapter 9.2 patent gazette]

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B09B Patent application refused [chapter 9.2 patent gazette]

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