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EP1413075B1 - Procede et dispositif permettant la transmission numerique au moyen d'emetteurs am - Google Patents

Procede et dispositif permettant la transmission numerique au moyen d'emetteurs am Download PDF

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Publication number
EP1413075B1
EP1413075B1 EP02727296A EP02727296A EP1413075B1 EP 1413075 B1 EP1413075 B1 EP 1413075B1 EP 02727296 A EP02727296 A EP 02727296A EP 02727296 A EP02727296 A EP 02727296A EP 1413075 B1 EP1413075 B1 EP 1413075B1
Authority
EP
European Patent Office
Prior art keywords
envelope
transmitter
output stage
supply voltage
signal
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
EP02727296A
Other languages
German (de)
English (en)
Other versions
EP1413075A2 (fr
Inventor
Dietmar Rudolph
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Deutsche Telekom AG
Original Assignee
Deutsche Telekom AG
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 Deutsche Telekom AG filed Critical Deutsche Telekom AG
Publication of EP1413075A2 publication Critical patent/EP1413075A2/fr
Application granted granted Critical
Publication of EP1413075B1 publication Critical patent/EP1413075B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/44—Arrangements characterised by circuits or components specially adapted for broadcast
    • H04H20/46—Arrangements characterised by circuits or components specially adapted for broadcast specially adapted for broadcast systems covered by groups H04H20/53-H04H20/95
    • H04H20/47—Arrangements characterised by circuits or components specially adapted for broadcast specially adapted for broadcast systems covered by groups H04H20/53-H04H20/95 specially adapted for stereophonic broadcast systems
    • H04H20/49—Arrangements characterised by circuits or components specially adapted for broadcast specially adapted for broadcast systems covered by groups H04H20/53-H04H20/95 specially adapted for stereophonic broadcast systems for AM stereophonic broadcast systems

Definitions

  • the invention relates to the field of broadcasting stations, which are converted in the course of the digitization of analog amplitude modulation (AM) to digital modulation.
  • AM analog amplitude modulation
  • the use of a non-linear AM transmitter for digital modulation requires a special mode of operation of the transmitter.
  • the generation of the modulated digital signal is effected by means of two mutually orthogonal partial signals (I and Q).
  • the I-signal (“in phase”) is modulated to a cosine oscillation with the frequency Ft (carrier frequency).
  • the Q signal (“quadrature”) is modulated to a sine wave of the same frequency Ft.
  • the sum of both modulated oscillations gives the complex modulated data signal (cosine 0-180 degrees, sine -90 - +90 degrees).
  • the modulated I / Q signal is shaped by filters to have exactly the prescribed waveform with the desired bandwidth.
  • the modulated I / Q signal must be converted to produce the two signals amplitude signal (A signal) and phase-modulated carrier signal (RF-P) therefrom, which are capable of properly driving the AM transmitter.
  • a signal amplitude signal
  • RF-P phase-modulated carrier signal
  • At the output of the AM transmitter results in turn afterwards the modulated I / Q signal with greater power.
  • the A signal is input to the modulator input (audio input) of the AM transmitter, and the RF P signal is used to drive the transmitter in the RF manner.
  • the two signals A & RF-P are multiplicatively combined and form the high-frequency digital output signal.
  • Both the A-signal and the RF-P signal obtained due to the required processing process far greater bandwidths than the digital signal initially had and should also have at the output of the transmitter again.
  • the increased bandwidths can often not be provided by the older modulators because they were not designed for it.
  • Using only the limited bandwidth that "older" transmitters have available in the modulator part results in significant out-of-band emissions. These have the property that they have only a very small slope in the spectrum and thus disturb quite a few adjacent channels.
  • the emissions are also above the limits coordinated by the ITU, so that a permit seems questionable.
  • Nonlinear distortions are particularly problematical if, as digital modulation, multicarrier signals, e.g. B. OFDM (Orthogonal Frequency Division Multiplexing) signals to be transmitted.
  • multicarrier signals e.g. B. OFDM (Orthogonal Frequency Division Multiplexing) signals to be transmitted.
  • the DRM (Digital Radio Musice) system for digital transmission in the AM areas which is currently being recommended by the ITU for standardization, proposes an OFDM method with approximately 200 carriers as the multicarrier method.
  • the amplitude signal is amplitude-limited in an AM transmitter which is operated in this non-linear mode
  • non-linear distortions result which on the one hand lead to increased out-of-band radiation and on the other hand also cause internal band disturbances, which due to the mode of operation of the transmitter can considerably exceed the out-of-band radiations.
  • the internal band disturbances reduce the achievable supply area, since a signal which is already intrinsically disturbed can tolerate fewer interferences in the radio channel in order to reach a critical threshold at the receiver.
  • EP-A-0431201 discloses an AM transmitter for digital signals operated in linear mode.
  • the present invention describes a method and arrangement for digital transmission with conventional AM transmitters, with which unwanted spurs by nonlinear distortions are largely avoided.
  • Non-linear distortions can be prevented if the operating point of the transmitter is shifted in such a way that a linear mode of operation arises.
  • the transmitter output stage is driven by the complex modulated data signal (I / Q signal) as known from digital systems DAB and DVB.
  • the linear operation of the transmitter is advantageous with respect to the noise emissions. These have spectrally much larger slopes than in the previously described nonlinear mode, so that the ITU spectrum mask can be maintained with good alignment of the transmitter. Only the efficiency of the transmitter is very low in linear operation and causes high electricity costs.
  • the efficiency in linear operation of the AM transmitter is so bad because even with small modulation of the transmitter output stage, the full supply voltage is applied to this stage and due to the quiescent current of the transmitter output power is converted into heat. An improved efficiency can be achieved that the supply voltage is not made much larger than the current level of the final stage requires it.
  • the envelope of the complex modulated data signal is sampled by an amplitude detector (envelope rectifier or peak rectifier) and the supply voltage or anode voltage of the output stage is controlled by means of the modulator acting as a clocked power supply.
  • an amplitude detector envelope rectifier or peak rectifier
  • the time constant of the envelope detector must be such that an increase in the envelope can be followed immediately, so that no overdriving with the resulting distortion and noise emissions occurs. Different, however, as it is z. B. in "dynamic amplitude modulation" is common, the time constant for the waste can be chosen as large as for the increase, since it does not have to be taken to a "hearing" consideration. The smaller waste time constant additionally increases the efficiency of the transmitter.
  • PDM Pulse Duration Modulation
  • PSM Pulse Step Modulation

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Transmitters (AREA)
  • Bipolar Transistors (AREA)

Claims (3)

  1. Procédé de transmission numérique à l'aide d'émetteurs AM dans lesquels des distorsions non linéaires apparaissent en raison du mode de fonctionnement non linéaire en transmission numérique, et entraînent un brouillage intrabande et des rayonnements hors bande, l'étage de sortie de l'émetteur AM fonctionnant en mode linéaire, le mode linéaire étant appliqué en combinaison avec un ajustement de la tension d'alimentation de l'étage de sortie de l'émetteur en fonction de la modulation instantanée de l'émetteur pour améliorer le rendement, caractérisé en ce que le modulateur de l'émetteur AM fonctionne comme une alimentation à découpage et fournit la tension d'alimentation ajustée pour l'étage de sortie de l'émetteur, en ce que l'enveloppe du signal de données complexe modulé est détectée, ce signal commandant l'ajustement de la tension d'alimentation pour l'étage de sortie de l'émetteur, en ce que la constante de temps lors de la détection de l'enveloppe est constituée de manière telle qu'une montée de l'enveloppe est immédiatement suivie, en ce que la constante de temps lors de la détection de l'enveloppe est de dimension identique pour la montée et la descente de l'enveloppe et en ce que le signal de données complexe modulé est temporisé après la détection de son enveloppe de manière que, entre temps, l'ajustement de la tension d'alimentation soit efficace permettant ainsi d'éviter des surmodulations, même brèves, de l'étage de sortie de l'émetteur.
  2. Procédé selon la revendication 1, caractérisé en ce que
    le modulateur fonctionnant comme une alimentation à découpage peut également être un modulateur à modulation d'impulsions en durée (pulse duration) ou un modulateur à modulation échelon amplitude (pulse step) et en ce que sur les émetteurs AM à modulateurs à amplificateurs symétriques classe B, un échange contre l'un de ces modulateurs doit être réalisé.
  3. Ensemble de transmission numérique à l'aide d'émetteurs AM dans lesquels l'étage de sortie fonctionne en mode linéaire pour éviter les distorsions non linéaires et dont la tension d'alimentation est ajustée par le signal de données complexe modulé en fonction de la modulation pour améliorer le rendement, caractérisé en ce qu'un détecteur d'amplitude (1), destiné à détecter l'enveloppe du signal de données complexe modulé, est monté en amont du modulateur (5 et 6) fonctionnant comme une alimentation à découpage et en ce qu'un étage de temporisation (2) du signal de données complexe modulé est intégré dans le trajet du signal en direction de l'étage de sortie (4) de l'émetteur, en amont des étages de pré-amplification haute fréquence (3), la constante de temps au cours de la détection de l'enveloppe par le détecteur d'amplitude (1) étant de dimension identique pour la montée et la descente de l'enveloppe.
EP02727296A 2001-05-30 2002-04-10 Procede et dispositif permettant la transmission numerique au moyen d'emetteurs am Expired - Lifetime EP1413075B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10127571A DE10127571A1 (de) 2001-05-30 2001-05-30 Verfahren und Anordnung für digitale Übertragung mit AM-Sendern
DE10127571 2001-05-30
PCT/DE2002/001314 WO2002098028A2 (fr) 2001-05-30 2002-04-10 Procede et dispositif permettant la transmission numerique au moyen d'emetteurs am

Publications (2)

Publication Number Publication Date
EP1413075A2 EP1413075A2 (fr) 2004-04-28
EP1413075B1 true EP1413075B1 (fr) 2009-12-02

Family

ID=7687454

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02727296A Expired - Lifetime EP1413075B1 (fr) 2001-05-30 2002-04-10 Procede et dispositif permettant la transmission numerique au moyen d'emetteurs am

Country Status (9)

Country Link
US (1) US7406131B2 (fr)
EP (1) EP1413075B1 (fr)
JP (2) JP4164023B2 (fr)
CN (1) CN100391132C (fr)
AT (1) ATE450941T1 (fr)
AU (1) AU2002257556A1 (fr)
DE (2) DE10127571A1 (fr)
ES (1) ES2337450T3 (fr)
WO (1) WO2002098028A2 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007000923A1 (fr) * 2005-06-27 2007-01-04 Matsushita Electric Industrial Co., Ltd. Appareil de transmission multiporteuse et méthode de transmission multiporteuse
US7729670B2 (en) * 2006-09-29 2010-06-01 Broadcom Corporation Method and system for minimizing power consumption in a communication system
US7929926B2 (en) * 2007-08-07 2011-04-19 Harris Corporation Transmitting RF signals employing both digital and analog components with a common amplifier
US9374791B2 (en) 2007-09-21 2016-06-21 Qualcomm Incorporated Interference management utilizing power and attenuation profiles
US9078269B2 (en) 2007-09-21 2015-07-07 Qualcomm Incorporated Interference management utilizing HARQ interlaces
US9066306B2 (en) 2007-09-21 2015-06-23 Qualcomm Incorporated Interference management utilizing power control
US9137806B2 (en) 2007-09-21 2015-09-15 Qualcomm Incorporated Interference management employing fractional time reuse
US8824979B2 (en) * 2007-09-21 2014-09-02 Qualcomm Incorporated Interference management employing fractional frequency reuse
KR100937851B1 (ko) 2007-10-04 2010-01-21 주식회사 피플웍스 멀티 캐리어 할당 기능을 가지는 고속데이터 통신용 무전기및 그 방법
US8867456B2 (en) 2007-11-27 2014-10-21 Qualcomm Incorporated Interface management in wireless communication system using hybrid time reuse
US8948095B2 (en) 2007-11-27 2015-02-03 Qualcomm Incorporated Interference management in a wireless communication system using frequency selective transmission
EP2234454B1 (fr) * 2009-03-24 2010-11-10 Alcatel Lucent Procédé de transmission de données utilisant un amplificateur d'élimination et de rétablissement d'enveloppe, amplificateur d'élimination et de rétablissement d'enveloppe, dispositif de transmission, dispositif de réception et réseau de communication correspondant
US9065584B2 (en) 2010-09-29 2015-06-23 Qualcomm Incorporated Method and apparatus for adjusting rise-over-thermal threshold
JP5305481B2 (ja) * 2011-03-10 2013-10-02 Ｎｅｃエンジニアリング株式会社 信号送信回路

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US4319359A (en) * 1980-04-10 1982-03-09 Rca Corporation Radio transmitter energy recovery system
JPS60229521A (ja) * 1984-04-27 1985-11-14 Sony Tektronix Corp デジタル信号遅延回路
DE69024182T2 (de) * 1989-06-30 1996-10-31 Nippon Telegraph & Telephone Linearer sender
US5249201A (en) * 1991-02-01 1993-09-28 Mst, Inc. Transmission of multiple carrier signals in a nonlinear system
IT1270173B (it) * 1994-06-07 1997-04-29 Sits Soc It Telecom Siemens Amplificatore lineare di potenza a microonde con iniezione di potenza di alimentazione comandata dall'inviluppo di modlazione
US5708681A (en) * 1996-04-23 1998-01-13 Bell Communications Research, Inc. Hybrid analog/digital method and apparatus for controlling the transmission power level of a radio transceiver
EP0885482B1 (fr) * 1996-06-19 1999-08-04 Fraunhofer-Gesellschaft Zur Förderung Der Angewandten Forschung E.V. Predistorsion pour un chemin de transmission non lineaire en haute frequence
US5880633A (en) * 1997-05-08 1999-03-09 Motorola, Inc. High efficiency power amplifier
US6049703A (en) * 1997-11-28 2000-04-11 Motorola, Inc. Amplifier circuit and method for increasing linearity of the amplifier circuit
DE19911437A1 (de) * 1999-03-04 2000-09-07 Deutsche Telekom Ag Verfahren und Anordnung für digitale Übertragung mit amplitudenmodulierten Sendern mit Modulationstransformator
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US6449465B1 (en) * 1999-12-20 2002-09-10 Motorola, Inc. Method and apparatus for linear amplification of a radio frequency signal

Also Published As

Publication number Publication date
EP1413075A2 (fr) 2004-04-28
AU2002257556A1 (en) 2002-12-09
ES2337450T3 (es) 2010-04-26
CN100391132C (zh) 2008-05-28
CN1463511A (zh) 2003-12-24
JP2004519977A (ja) 2004-07-02
ATE450941T1 (de) 2009-12-15
US20030148743A1 (en) 2003-08-07
US7406131B2 (en) 2008-07-29
JP4164023B2 (ja) 2008-10-08
JP2008182766A (ja) 2008-08-07
WO2002098028A2 (fr) 2002-12-05
DE10127571A1 (de) 2002-12-05
DE50214048D1 (de) 2010-01-14
WO2002098028A3 (fr) 2003-07-24

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