EP0170847B1 - Système de transmission à phase rigide d'un signal de modulation basse fréquence et circuit d'exécution du système - Google Patents

Système de transmission à phase rigide d'un signal de modulation basse fréquence et circuit d'exécution du système Download PDF

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Publication number
EP0170847B1
EP0170847B1 EP85107696A EP85107696A EP0170847B1 EP 0170847 B1 EP0170847 B1 EP 0170847B1 EP 85107696 A EP85107696 A EP 85107696A EP 85107696 A EP85107696 A EP 85107696A EP 0170847 B1 EP0170847 B1 EP 0170847B1
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EP
European Patent Office
Prior art keywords
auxiliary carrier
frequency
modulation signal
sideband
rac
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
Application number
EP85107696A
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German (de)
English (en)
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EP0170847A1 (fr
Inventor
Manfred Tiesnes
Willy Zimmerman
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BBC Brown Boveri AG Switzerland
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BBC Brown Boveri AG Switzerland
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Priority to AT85107696T priority Critical patent/ATE43035T1/de
Publication of EP0170847A1 publication Critical patent/EP0170847A1/fr
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Publication of EP0170847B1 publication Critical patent/EP0170847B1/fr
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/65—Arrangements characterised by transmission systems for broadcast
    • H04H20/67—Common-wave systems, i.e. using separate transmitters operating on substantially the same frequency

Definitions

  • the invention relates to a method for the phase-locked transmission of a low-frequency modulation signal according to the preamble of claim 1 and a circuit arrangement for carrying out the method.
  • a method of the type mentioned is e.g. B. from Brown Boveri Mitt 5/6, 1983, pp. 186-188 and from DE-A-3 044 438.
  • Common-frequency radio is frequently used for frequency-economical radio coverage of large areas, in which a plurality of interconnected base stations are operated simultaneously on the same frequency channel.
  • the base stations are distributed in such a way that the areas they cover adjoin one another and cover the entire radio coverage area.
  • the carrier frequencies of the different base stations are coupled to one another and absolutely identical.
  • a separate, highly stable oscillator for the carrier frequency is provided in each base station, the maximum deviation between the carrier frequencies of different base stations not being allowed to be more than 5-20 Hz.
  • the modulation signals are transmitted from a central signal source to the individual base stations via feeder connections, where they modulate the respective carrier. Since the base stations are at different distances from the central signal source and different technical systems (LF line, radio link, etc.) may be used for the feeder connections, there are in particular runtime and phase differences between the modulation signals transmitted on different feeder connections, which are balanced in a suitable manner must be in order to limit disturbing interference phenomena in the overlap areas.
  • any carrier frequency transmission systems cannot be used as feeder connections, because the transposition of the different channels at the different locations produces signals with different phases and frequencies, which cannot be matched to one another in the known way by inserting correction elements.
  • the present invention is therefore based on the object of specifying a method for the phase-locked transmission of modulation signals from the central signal source to the base stations of a single-wave radio system, in which the compensation of phase errors occurring is achieved regardless of the type of feeder connection, and which therefore also Permission to use any carrier frequency transmission systems as feeder connections.
  • the essence of the invention is to mix the modulation signal with a subcarrier before transmission, to transmit at least one of the side bands resulting from the mixing together with the subcarrier to the base stations and there to mix again with the transmitted subcarrier or with a phase-locked coupling to it to demodulate locally generated subcarriers. Since the sideband signal and the subcarrier always experience the same phase shifts on the feeder connection, the phase shift of the modulation signal is automatically compensated for during demodulation by means of the transmitted subcarrier.
  • the side band and subcarrier preferably lie in the same channel, which is designed as a telephony channel.
  • the circuit arrangement for carrying out the method has a modulator with a local oscillator, preferably a quartz oscillator, and a first mixer behind each signal source and a corresponding demodulator with a second mixer and means for recovering the auxiliary carrier in front of each base station.
  • a modulator with a local oscillator preferably a quartz oscillator
  • FIG. 1 shows an exemplary single-wave radio system according to the prior art.
  • the radio coverage of a large area takes place via a plurality of base stations B1, ..., B3, which simultaneously transmit the carrier signal modulated with a low-frequency modulation signal via corresponding antennas A1, ..., A3.
  • the modulation signal comes from a low-frequency signal source 1, e.g. B. a microphone, and is distributed via feeder connections to the individual base stations B1, ..., B3.
  • the feeder connections can be realized by LF lines 11, 12 of different lengths, but also by a single-channel radio link 13 with a radio relay 2 and a radio receiver 3.
  • phase correction elements 4 are provided in the lines, which compensate for phase differences by means of runtime differences and differences in the phase response.
  • the modulation signal is now changed before it is transmitted via the feeder connection in such a way that the phase change can be corrected by the feeder connection at the base station without knowing the properties of the connection itself.
  • FDM Frequency Division Multiplex
  • FIG. 2 The block diagram of a single such FDM feeder connection with phase correction according to the invention is shown in Fig. 2. Since an FDM system only makes sense if several channels have to be transmitted at the same time, a plurality of low-frequency signal sources 1 is assumed in FIG. Each of the signal sources is assigned its own channel. The modulation signals coming from the signal sources 1 are first modified within their channel by a subsequent modulator in the sense of the method according to the invention. The details of this modification will be discussed in more detail later in connection with the design of the modulator 5.
  • the individual channels are transposed to higher frequencies by a carrier frequency multiplexer 6 in a manner known per se and are transmitted in frequency to one another via a carrier frequency transmitter 7 and a carrier frequency path 14 to a carrier frequency receiver 8.
  • a subsequent carrier frequency demultiplexer 9 returns the channels to their starting position in terms of frequency and forwards them separately to a number of demodulators 10 corresponding to the number of channels, in which the respective phase shift is corrected and the original modulation signal is recovered.
  • the recovered modulation signals are then passed on to a base station B, where they modulate the carrier signal emitted via an antenna A.
  • FIG. 3 A preferred exemplary embodiment of the modulator 5 from FIG. 2 is shown with its block diagram in FIG. 3. A detailed representation of the circuitry structure of the individual blocks has been dispensed with here as well as with the corresponding circuit diagram of the demodulator 10, because the execution is known to every person skilled in carrier frequency technology.
  • the modulation signal from the signal source 1 is first applied to the input of a first input amplifier 16 via a first isolating transformer 15, which preferably has a transmission ratio of 1: 1 and an impedance of 600 ohms, and there to a for further signal processing favorable level strengthened.
  • the first input amplifier 16 is followed by a band limit filter 17 which limits the frequency band of the modulation signal and preferably has an upper limit frequency of approximately 3 kHz.
  • the pass characteristic of the band limitation filter is entered as a dashed line in FIG. 5 a, which shows the low frequency band NB of the modulation signal, which results from the limitation and lies between 0.3 and 3 kHz.
  • the low-frequency band NB is fed to the one input of a first mixer 18 which mixes the modulation signal with an auxiliary carrier HT of preferably 3.3 kHz, shown on the frequency axis in FIG. 5b.
  • the subcarrier HT is derived from the oscillator frequency of a local oscillator, preferably a quartz oscillator 20, which, for. B. 3,3792 MHz and is divided by a subsequent first frequency divider 21 with a division ratio of 210: 1 to 3.3 kHz. Other oscillator frequencies accordingly require different sub-ratios.
  • a lower sideband USB and an upper sideband OSB are formed symmetrically to the frequency of the subcarrier HT. Both sidebands are shown in Fig. 5c.
  • the lower sideband USB corresponds to the low-frequency band NB in the upside-down position and, taken by itself, contains the same information.
  • the first mixer 18 is therefore preferably followed by a first sideband filter 19 with a pass characteristic shown in dashed lines in FIG. 5c, which suppresses the subcarrier HT and the upper sideband OSB with an upper limit frequency of 3 kHz.
  • the remaining lower sideband USB arrives at an input of an adder amplifier 23.
  • a subcarrier residue HTR which is reduced in amplitude, is fed to another input of the adder amplifier 23, which is transmitted via an harmonic filter 22 with an upper cutoff frequency of e.g. B. 4 kHz, is taken at the output of the first frequency divider 21.
  • a modified modulation signal then appears at the output of the adder amplifier 23, which is composed of the lower sideband USB and the adjacent subcarrier residue HTR. Both are shown in solid lines in FIG. 5c.
  • the modified modulation signal can now over any feeder connection with the appropriate bandwidth such.
  • B. the FDM system of FIG. 2 can be transmitted to the base stations, where it is previously corrected and converted back in the demodulator 10.
  • a preferred embodiment of the demodulator 10 which matches the modulator of FIG. 3 is shown with its block diagram in FIG. 4.
  • the modified modulation signal of FIG. 6a arriving via the feeder connection is first amplified in the modulator 10 in a second input amplifier 24 and fed to a second mixer 25.
  • the auxiliary carrier residue HTR is branched off from the amplified signal by means of a high-pass filter 29, which has a lower cut-off frequency of 3.2 kHz for the exemplary frequencies from FIG. 6a, and is further used in the demodulator 10 for the local generation of a phase-locked-coupled auxiliary carrier.
  • the branched subcarrier remainder HTR is amplified in a carrier signal amplifier 30 and passed on for synchronization of a PLL (phase locked loop) circuit 31 to its synchronization input.
  • the PLL circuit preferably generates a frequency of 6.6 kHz, which is divided down in a subsequent second frequency divider 32 with a division ratio of 2: 1 to 3.3 kHz and fed to the feedback input of the PLL circuit 31 via a feedback loop.
  • the local subcarrier is mixed in the second mixer 25 with the amplified modified modulation signal, as a result of which a lower sideband USB and an upper sideband OSB are produced again according to FIG. 6b.
  • the lower sideband USB corresponds to the original low-frequency band NB from FIG. 5a and is separated by a second sideband filter 26 (upper cut-off frequency: 3 kHz), whose pass characteristic is entered in FIG. 6b (FIG. 6c), amplified in an output amplifier 27 and passed on to the subsequent base station via a second isolating transformer 28 (transmission ratio: 1: 1; impedance: 600 ohms).
  • the modified modulation signal (lower sideband USB in reverse position + auxiliary carrier rest HTR) can be transmitted via any internationally standardized telephony channel that has one Has a minimum bandwidth of 0.3 to 3.4 kHz.
  • the method according to the invention provides a method to easily compensate for phase shifts of the modulation signal to be transmitted when controlling base transmitters of a single-wave radio system, regardless of the type of feeder connection.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Transmitters (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Claims (9)

1. Procédé pour la transmission à verrouillage de phase d'un signal de modulation basse fréquence d'une source de signaux centrale, par l'intermédiaire de liaisons de modulation, à plusieurs stations de base réparties dans l'espace d'un système de radio sur fréquence commune, dans lequel des rotations de phases du signal de modulation dans la liaison de modulation sont compensées, caractérisé en ce que:
- une sous-porteuse (HT), située en dehors de la bande de basse fréquence (NB) du signal de modulation, est produite;
- la sous-porteuse (HT) est mélangée avec le signal de modulation;
- la bande latérale inférieure (USB) résultant du mélange est transmise conjointement avec un résidu de sous-porteuse (HTR) aux stations de base (B, B1, ..., B3), et
- aux stations de base (B, B1, ..., B3), le signal de modulation initial est récupéré à partir de la bande latérale inférieure (USB) par mélange avec l'aide du résidu de sous-porteuse (HTR) transmis.
2. Procédé suivant la revendication 1, caractérisé en ce que la bande de basse fréquence (NB) du signal de modulation et la sous-porteuse (HT) sont situées dans un canal téléphonique, la bande de basse fréquence (NB) s'étendant, de préférence, sur des fréquences de 0,3 à 3 kHz et la sous-porteuse (HT) présentant, de préférence, une fréquence de 3,3 kHz.
3. Procédé suivant la revendication 2, caractérisé en ce qu'aux stations de base (B, B1,. .., B3), le résidu de sous-porteuse (HTR) transmis est séparé de la bande latérale inférieure (USB) et une sous-porteuse locale de même fréquence, couplée avec verrouillage de phase au résidu de sous-porteuse (HTR), est produite et est utilisée pour le mélange avec la bande latérale inférieure (USB).
4. Procédé suivant la revendication 1, caractérisé en ce que les bandes latérales inférieures (USB) de plusieurs signaux de modulation sont multiplexées avec les sous- porteuses (HT) associées selon le procédé à fréquence porteuse et sont transmises, en tant que signal multiplex, aux stations de base (B, B1). .., B3) où elles sont démultiplexées avant la récupération des signaux de modulation initiaux.
5. Montage de circuit pour l'exécution du procédé suivant la revendication 1, caractérisé en ce que, dans chaque liaison de modulation allant de la source de signaux (1) à une station de base (B, B1) ..., B3), en aval de la source de signaux (1), est installé un modulateur (5) et, en amont de la station de base (B, B1, ..., B3), un démodulateur (10), que le modulateur (5) contient un oscillateur local, destiné à produire la sous-porteuse (HT), et un premier mélangeur (18), destiné à mélanger le signal de modulation avec la sous-porteuse (HT), et que le démodulateur (10) comporte un filtre passe-haut (29) pour la séparation du résidu de sous-porteuse (HTR) transmis, un second mélangeur (25) pour la récupération du signal de modulation initial à l'aide du résidu de sous-porteuse (HTR) transmis et un second filtre de bande latérale (26) disposé à la sortie du second mélangeur (25) pour la suppression de la sous-porteuse (HT) et de la bande latérale supérieure (OSB) apparaissant lors du mélange.
6. Montage de circuit suivant la revendication 5, caractérisé en ce que, dans le modulateur (5), en aval de la sortie du premier mélangeur (18), est prévu un premier filtre de bande latérale (19), destiné à supprimer la sous-porteuse (HT) et la bande latérale supérieure (OSB) apparaissant lors du mélange, et qu'à la bande latérale inférieure (USB) restante est ajouté, dans un amplificateur sommateur (23), le résidu de sous-porteuse (HTR) qui est prélevé sur l'oscillateur à quartz (20).
7. Montage de circuit suivant la revendication 6, caractérisé en ce que l'oscillateur local est un oscillateur à quartz (20) et oscille à une fréquence qui est un multiple de la fréquence de la sous-porteuse (HT) et que l'oscillateur à quartz (20) est suivi d'un premier diviseur de fréquence (21) destiné à produire la sous-porteuse (HT).
8. Montage de circuit suivant la revendication 7, caractérisé en ce que, dans le démodulateur (10), en aval du filtre passe-haut (29), sont disposés un amplificateur de signal porteur (30), puis un circuit PLL (Phase Locked Loop ou boucle à verrouillage de phase) (31) qui produit une sous-porteuse locale de même fréquence, couplée avec verrouillage de phase au résidu de sous-porteuse (HTR), et la transmet au second mélangeur (25).
9. Montage de circuit suivant la revendication 8, caractérisé en ce que:
- l'oscillateur à quartz (20) produit une fréquence de 3,3792 MHz;
- le premier diviseur de fréquence (21) presente un rapport de division de 210 : 1;
- le premier et le second filtre de bande latérale (19, 26) présentent une fréquence de coupure supérieure de 3 kHz;
- le filtre passe-haut (29) présente une fréquence de coupure inférieure de 3,2 kHz, et
- en amont du premier mélangeur (18) est installé un filtre limiteur de bande (17) d'une largeur de bande de 0,3 à 3 kHz.
EP85107696A 1984-07-20 1985-06-21 Système de transmission à phase rigide d'un signal de modulation basse fréquence et circuit d'exécution du système Expired EP0170847B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85107696T ATE43035T1 (de) 1984-07-20 1985-06-21 Verfahren zur phasenstarren uebertragung eines niederfrequenten modulationssignals sowie schaltungsanordnung zur durchfuehrung des verfahrens.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH3543/84 1984-07-20
CH3543/84A CH667169A5 (de) 1984-07-20 1984-07-20 Verfahren zur phasenstarren uebertragung eines niederfrequenten modulationssignals sowie schaltungsanordnung zur durchfuehrung des verfahrens.

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EP0170847A1 EP0170847A1 (fr) 1986-02-12
EP0170847B1 true EP0170847B1 (fr) 1989-05-10

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EP85107696A Expired EP0170847B1 (fr) 1984-07-20 1985-06-21 Système de transmission à phase rigide d'un signal de modulation basse fréquence et circuit d'exécution du système

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EP (1) EP0170847B1 (fr)
AT (1) ATE43035T1 (fr)
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DE (1) DE3570166D1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0394772B1 (fr) * 1989-04-25 1994-08-17 Alcatel SEL Aktiengesellschaft Système de transmission de télévision par câble optique
FR2688364B1 (fr) * 1992-03-06 1995-02-24 Telediffusion Fse Procede et systeme permettant d'obtenir un reseau d'emetteurs fm, notamment monofrequence synchrone.

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Publication number Priority date Publication date Assignee Title
US2094113A (en) * 1936-07-10 1937-09-28 American Telephone & Telegraph Wave transmission
DE3044438A1 (de) * 1980-11-26 1982-06-24 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Verfahren und anordnung zum aussenden von nachrichten ueber gleichwellensender

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DE3570166D1 (en) 1989-06-15
EP0170847A1 (fr) 1986-02-12
CH667169A5 (de) 1988-09-15
ATE43035T1 (de) 1989-05-15

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