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WO2003050970A1 - Method for the selection of several antennae in an antenna diversity reception system and antenna diversity reception system - Google Patents

Method for the selection of several antennae in an antenna diversity reception system and antenna diversity reception system Download PDF

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Publication number
WO2003050970A1
WO2003050970A1 PCT/EP2002/014197 EP0214197W WO03050970A1 WO 2003050970 A1 WO2003050970 A1 WO 2003050970A1 EP 0214197 W EP0214197 W EP 0214197W WO 03050970 A1 WO03050970 A1 WO 03050970A1
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WO
WIPO (PCT)
Prior art keywords
antenna
reception quality
evaluation unit
reception
selector switch
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.)
Ceased
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PCT/EP2002/014197
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German (de)
French (fr)
Inventor
Stefan Brinkhaus
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.)
Harman Becker Automotive Systems GmbH
Harman Becker Automotive Systems Becker Division GmbH
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Harman Becker Automotive Systems GmbH
Harman Becker Automotive Systems Becker Division GmbH
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Publication date
Application filed by Harman Becker Automotive Systems GmbH, Harman Becker Automotive Systems Becker Division GmbH filed Critical Harman Becker Automotive Systems GmbH
Priority to EP20020792999 priority Critical patent/EP1454427A1/en
Publication of WO2003050970A1 publication Critical patent/WO2003050970A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0802—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection
    • H04B7/0805—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with single receiver and antenna switching
    • H04B7/0814—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with single receiver and antenna switching based on current reception conditions, e.g. switching to different antenna when signal level is below threshold

Definitions

  • the invention relates to a method for selecting one of several antennas of an antenna diversity reception system with an antenna selector switch, with an evaluation unit, with an interference detector and with a radio receiver.
  • the invention further relates to an antenna diversity reception system with an antenna selector switch, with an evaluation unit, with an interference detector and with a radio receiver.
  • An antenna diversity reception system is a radio reception system with a radio receiver that can be connected to one of several, usually spatially separated antennas.
  • Antenna diversity reception systems of this type are used, for. B. used in motor vehicles.
  • Disk antennas are preferably used as antennas, which are integrated, for example, in the windows of the motor vehicle.
  • a selection circuit selects one of the antennas for connection to the radio receiver according to predefinable criteria.
  • reception conditions are often so unfavorable that the selection circuit constantly switches from one antenna to the other.
  • these switching processes impair the acoustic reproduction of the radio receiver in a clearly audible manner.
  • each antenna due to its reception interference and noise level, causes its own sound pattern when it is reproduced acoustically by the loudspeaker. The listener therefore notices constantly changing sound images of the loudspeaker from switching operation to switching operation, which is an unpleasant, uneasy, unsteady listening impression conveyed, which can be aptly described as a sizzling listening impression.
  • Such an unfavorable reception condition which leads to frequent unnecessary switching to another antenna, is due to e.g. B. before when a transmitter with only low field strength is received because noise and other reception interference then can hardly be distinguished from each other.
  • B. e.g. B.
  • adjacent channel interference occurs, there is also a reception condition that causes frequent switching to other antennas.
  • this object is achieved with the features specified in claim 1 in that the reception quality, determined by the evaluation unit, of the antenna connected in each case is stored in a memory, and that when a reception disturbance is detected by the interference detector, it is switched to another antenna for so long whose reception quality is compared with that of the respective previous antenna until an antenna with a better reception quality is found, but that, if no antenna with a better reception quality is found in one pass of all antennas, the original antenna is switched on remains.
  • this object is achieved with the features specified in claim 8 in that the output of the antenna selector switch is connected to the antenna input of the interference detector and the evaluation unit, and that the output of the interference detector is connected to the interference input of the evaluation unit the control output of which is connected to the control input of the antenna selector switch and that the evaluation unit is connected to a memory.
  • the method according to the invention provides for constantly checking the reception quality by means of an evaluation unit and storing it in a memory.
  • An interference detector is used to detect interference in the reception quality. For example, the reception field strength can serve as a criterion for the reception quality. If the reception quality falls below a predefinable threshold value, the interference detector sends a control pulse to the evaluation unit, which actuates the antenna selector switch, which switches over to another antenna. The reception quality of the newly connected antenna is now compared with the previous one in the evaluation unit. If the reception quality of the new antenna is better than the previous one, the new antenna remains switched on.
  • the reception quality of the newly connected antenna is not better than that of the previous one, a switch is made to another antenna, preferably the next one, until all antennas have been checked. If no antenna with a better reception quality is found during a complete run, the original antenna remains switched on.
  • One exemplary embodiment of the invention provides for a search to be started again after a predefinable period of time.
  • the reception field strength can be provided, which is converted into a voltage.
  • This voltage is e.g. B. stored on a capacitor serving as a memory.
  • Another exemplary embodiment provides that the interference detector detects amplitude dips in the received signal.
  • EP 0 475 188 B1 describes such an interference detector for a radio receiver, which detects interference in the received signal, e.g. B. in amplitude drops, disturbances indicating pulses generated.
  • This interference detector can, for. 3 - use in an advantageous manner.
  • One each of five antennas AI to A5 is connected to an input of an antenna selection switch AS, the output of which is connected to the antenna input of a radio receiver E, an interference detector D and an evaluation unit A.
  • the control output of the interference detector D is connected to the control input of the evaluation unit A, the control output of which is connected to the control input of the antenna selection switch AS.
  • the evaluation unit A is connected to a memory S.
  • the antenna AI is connected to the interference detector D, the evaluation unit A and the radio receiver E via the antenna selector switch AS.
  • the evaluation unit A determines the reception quality of the antenna AI and stores it in the memory S.
  • the reception field strength for example, can serve as reception quality.
  • the reception field strength is preferably converted into a voltage which is stored on a capacitor which serves as a memory.
  • the fault detector D detects a disturbance, for example a dip in amplitude, it sends a control pulse to the evaluation unit A, which gives a control pulse to the antenna selection switch AS, which is switched over to the next antenna A2.
  • the evaluation unit A determines the reception quality of the antenna A2 now connected and compares it with the reception quality of the antenna AI stored in the memory S. If the reception quality of the currently connected antenna A2 is greater than that of the previous antenna AI, the antenna A2 remains connected. However, if the reception quality of the currently connected antenna A2 is not better than that of the antenna AI, the evaluation unit A sends a further control pulse to the antenna selection switch AS, which switches over to the next antenna A3. The evaluation unit A previously saves the reception quality of the antenna A2 in the memory S.
  • the evaluation unit A compares the reception quality of the antenna A3 now connected with the reception quality stored in the memory S of the antenna A2 previously connected. If the reception quality of the connected antenna A3 is not better than that of the previously connected antenna A2, the next antenna A4 is switched on until an antenna with a better reception quality is finally found.
  • the antenna AI originally switched on remains switched on.
  • the invention is distinguished by the advantage that it always finds the best antenna at the moment and switches it to the input of the radio receiver. Radio reception is therefore almost always possible, even if all antennas only provide insufficient reception qualities.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radio Transmission System (AREA)

Abstract

The aim of the invention is to prevent constant needless switching to another antenna in an antenna diversity reception system comprising several antennae (A1 -A5). To achieve this, the reception quality of the respectively instantaneously used antenna (A1) is stored in a memory (S). If a malfunction such as a malfunction in the amplitude of the reception signal is detected by a malfunction detector (D), switching occurs to another antenna (A2) and the reception quality thereof is compared with the previously used antenna (A1). If the reception quality of the newly used antenna (A2) is better than that of the previously used antenna (A1), the new antenna (A2) continues to be used. If this is not the case, the search is continued until an antenna with a better reception quality than that of the previously used antenna is found. If a full search is unable to reveal a better antenna, the originally used antenna (A1) continues to be used. A new search is carried out after a specific period of time.

Description

Beschreibung description

Verfahren zur Auswahl einer von mehreren Antennen einer Anten- nendiversity-Empfangsanlage und Antennendi ersity-Empfangsa - lägeMethod for selecting one of several antennas of an antenna diversity reception system and antenna diversity reception facility

Die Erfindung betrifft ein Verfahren zur Auswahl einer von mehreren Antennen einer Antennendiversity-Empfangsanlage mit einem Antennenwahlschalter, mit einer Auswerteeinheit, mit ei- nem 'Stördetektor und mit einem Funkempfänger.The invention relates to a method for selecting one of several antennas of an antenna diversity reception system with an antenna selector switch, with an evaluation unit, with an interference detector and with a radio receiver.

Die Erfindung betrifft weiter eine Antennendiversity- Empfangsanlage mit einem Antennenwahlschalter, mit einer Auswerteeinheit, mit einem Stördetektor und mit einem Funkempfän- ger.The invention further relates to an antenna diversity reception system with an antenna selector switch, with an evaluation unit, with an interference detector and with a radio receiver.

Eine Antennendiversity-Empfangsanlage ist eine Funkempfangsanlage mit einem Funkempfänger, der an eine von mehreren, meist räumlich getrennten Antennen anschließbar ist. Derartige An- tennendiversity-Empfangsanlagen werden z. B. in Kraftfahrzeugen eingesetzt. Als Antennen dienen bevorzugt Scheibenantennen, die beispielsweise in die Scheiben des Kraftfahrzeuges integriert sind. Bei Betrieb der Antennendiversity- Empfangsanlage, beispielsweise eine Rundfunkempfangsanlage, eine Fernsehempfangsanlage oder eine Telefonanlage, wählt eine AuswahlSchaltung nach vorgebbaren Kriterien eine der Antennen zum Anschließen an den Funkempfänger aus.An antenna diversity reception system is a radio reception system with a radio receiver that can be connected to one of several, usually spatially separated antennas. Antenna diversity reception systems of this type are used, for. B. used in motor vehicles. Disk antennas are preferably used as antennas, which are integrated, for example, in the windows of the motor vehicle. When operating the antenna diversity reception system, for example a radio reception system, a television reception system or a telephone system, a selection circuit selects one of the antennas for connection to the radio receiver according to predefinable criteria.

Es kommen jedoch häufig derart ungünstige Empfangsbedingungen vor, dass die Auswahlschaltung ständig von einer Antenne auf die andere umschaltet . Diese Umschaltvorgänge beeinträchtigen aber die akustische Wiedergabe des Rundfunkempfangsgerätes in deutlich hörbarer Weise. Zusätzlich verursacht jede Antenne bedingt durch ihre Empfangsstörungen und den Rauschpegel ihr eigenes Klangbild bei der akustischen Wiedergabe durch den Lautsprecher. Der Hörer bemerkt daher ständig von Umschaltvorgang zu Umschaltvorgang wechselnde Klangbilder des Lautsprechers, was einen unangenehmen, unruhigen, unsteten Höreindruck vermittelt, der treffend als bruzelnder Höreindruck bezeichnet werden kann.However, reception conditions are often so unfavorable that the selection circuit constantly switches from one antenna to the other. However, these switching processes impair the acoustic reproduction of the radio receiver in a clearly audible manner. In addition, each antenna, due to its reception interference and noise level, causes its own sound pattern when it is reproduced acoustically by the loudspeaker. The listener therefore notices constantly changing sound images of the loudspeaker from switching operation to switching operation, which is an unpleasant, uneasy, unsteady listening impression conveyed, which can be aptly described as a sizzling listening impression.

Eine derart ungünstige Empfangsbedingung, die zu häufigem un- nötigen Umschalten auf eine andere Antenne führt, liegt z. B. vor, wenn ein Sender mit nur geringer Feldstärke empfangen wird, weil Rauschen und andere Empfangsstörungen dann kaum noch voneinander zu unterscheiden sind. Doch auch bei hohen einen guten Empfang bietenden Empfangsfeldstärken kann es vor- kommen, dass eine Antenne mit stark gestörtem Empfang häufig, wenn auch nur kurzfristig, an den Funkempfänger geschaltet wird, obwohl andere Antennen einen besseren Empfang bieten. Wenn NachbarkanalStörungen auftreten, liegt ebenfalls eine Empfangsbedingung vor, die häufiges Umschalten auf andere Antennen bewirkt .Such an unfavorable reception condition, which leads to frequent unnecessary switching to another antenna, is due to e.g. B. before when a transmitter with only low field strength is received because noise and other reception interference then can hardly be distinguished from each other. However, even with high reception field strengths offering good reception, it can happen that an antenna with strongly disturbed reception is frequently, if only briefly, connected to the radio receiver, although other antennas offer better reception. If adjacent channel interference occurs, there is also a reception condition that causes frequent switching to other antennas.

Es ist daher Aufgabe der Erfindung, ein Verfahren zur Auswahl einer von mehreren Antennen einer Antennendiversity- Empfangsanlage sowie eine Antennendiversity-Empfangsanlage so zu gestalten, dass unnötige Umschaltungen auf eine andere Antenne weitestgehend vermieden werden.It is therefore an object of the invention to design a method for selecting one of a plurality of antennas of an antenna diversity reception system and an antenna diversity reception system in such a way that unnecessary switchovers to another antenna are largely avoided.

Verfahrensmäßig wird diese Aufgabe mit den im Anspruch 1 angegebenen Merkmalen dadurch gelöst, dass die von der Auswerte- eiriheit ermittelte Empfangsqualität der jeweils aufgeschalteten Antenne in einem Speicher gespeichert wird, dass bei De- tektion einer Empfangsstörung durch den Stördetektor so lange auf eine andere Antenne geschaltet wird, deren Empf ngsqualität mit derjenigen der jeweils vorangehenden Antenne vergli- chen wird, bis eine Antenne mit einer besseren Empfangsqualität gefunden wird, dass aber, wenn keine Antenne mit einer besseren Empf ngs uälitat in einem Durchlauf aller Antennen gefunden wird, die ursprüngliche Antenne aufgeschaltet bleibt.In terms of the method, this object is achieved with the features specified in claim 1 in that the reception quality, determined by the evaluation unit, of the antenna connected in each case is stored in a memory, and that when a reception disturbance is detected by the interference detector, it is switched to another antenna for so long whose reception quality is compared with that of the respective previous antenna until an antenna with a better reception quality is found, but that, if no antenna with a better reception quality is found in one pass of all antennas, the original antenna is switched on remains.

Vorrichtungsmäßig wird diese Aufgabe mit den im Anspruch 8 angegebenen Merkmalen dadurch gelöst , dass der Ausgang des AntennenwahlSchalters mit dem Antenneneingang des Stördetektors und der Auswerteeinheit verbunden ist, dass der Ausgang des Stördetektors mit dem Störeingang der Auswerteeinheit verbun- den ist, deren Steuerausgang mit dem Steuereingang des AntennenwahlSchalters verbunden ist, und dass die Auswerteeinheit mit einem Speicher verbunden ist .In terms of the device, this object is achieved with the features specified in claim 8 in that the output of the antenna selector switch is connected to the antenna input of the interference detector and the evaluation unit, and that the output of the interference detector is connected to the interference input of the evaluation unit the control output of which is connected to the control input of the antenna selector switch and that the evaluation unit is connected to a memory.

Das erfindungsgemäße Verfahren sieht vor, ständig die Empfangs-qualität mittels einer' Auswerteeinheit zu prüfen und in einem Speicher zu speichern. Ein Stördetektor dient dazu, Störungen der Empfangsqualität zu detektieren. Beispielsweise kann die Empfangsfeldstärke als Kriterium für die Empfangsqua- lität die-nen. Wenn die Empfangsqualität einen vorgebbaren Schwellwert unterschreitet, gibt der Stördetektor einen Steuerimpuls an die Auswerteeinheit ab, welche den Antennen- wahlschalter betätigt, der auf eine andere Antenne umschaltet. In der Auswerteeinheit wird nun die Empfangsqualität der neu aufgeschalteten Antenne mit der vorhergehenden verglichen. Ist die Empfangsqualität der neuen Antenne besser als der vorherigen, so bleibt die neue Antenne aufgeschaltet . Ist dagegen auch die Empfangsqualität der neu aufgeschalteten Antenne nicht besser als die der vorhergehenden, so wird jeweils auf eine weitere Antenne, vorzugsweise die nächste, geschaltet, bis alle Antennen geprüft sind. Wird während eines vollständigen Durchlaufs keine Antenne mit einer besseren Empfangsqualität gefunden, so bleibt die ursprüngliche Antenne aufgeschal- tet.The method according to the invention provides for constantly checking the reception quality by means of an evaluation unit and storing it in a memory. An interference detector is used to detect interference in the reception quality. For example, the reception field strength can serve as a criterion for the reception quality. If the reception quality falls below a predefinable threshold value, the interference detector sends a control pulse to the evaluation unit, which actuates the antenna selector switch, which switches over to another antenna. The reception quality of the newly connected antenna is now compared with the previous one in the evaluation unit. If the reception quality of the new antenna is better than the previous one, the new antenna remains switched on. If, on the other hand, the reception quality of the newly connected antenna is not better than that of the previous one, a switch is made to another antenna, preferably the next one, until all antennas have been checked. If no antenna with a better reception quality is found during a complete run, the original antenna remains switched on.

Ein Ausführungsbeispiel der Erfindung sieht vor, nach einer vorgebbaren Zeitspanne erneut einen Suchlauf zu starten.One exemplary embodiment of the invention provides for a search to be started again after a predefinable period of time.

Als eine die Empfangsqualität repräsentierende Größe kann z. B. die Empfangsfeldstärke vorgesehen sein, die in eine Spannung gewandelt wird. Diese Spannung wird z. B. auf einem als Speicher dienenden Kondensator gespeichert.As a quantity representing the reception quality, e.g. B. the reception field strength can be provided, which is converted into a voltage. This voltage is e.g. B. stored on a capacitor serving as a memory.

Ein weiteres Ausführungsbeispiel sieht vor, dass der Störde- tektor Amplitudeneinbrüche im Empfangssignal detektiert.Another exemplary embodiment provides that the interference detector detects amplitude dips in the received signal.

In EP 0 475 188 Bl ist beispielsweise ein derartiger Stördetektor für einen Funkempfänger beschrieben, der bei Störungen im Empfangssignal, z. B. bei Amplitudeneinbrüchen, Störungen anzeigende Impulse erzeugt. Dieser Stördetektor lässt sich z. 3 -in vorteilhafter Weise einsetzen.EP 0 475 188 B1, for example, describes such an interference detector for a radio receiver, which detects interference in the received signal, e.g. B. in amplitude drops, disturbances indicating pulses generated. This interference detector can, for. 3 - use in an advantageous manner.

Das erfindungsgemäße Verfahren und die erfindungsgemäße Anten- nendiversity-Empfangsanlage werden anhand des in der Figur gezeigten Aus ührungsbeispiels näher beschrieben und erläutert .The method according to the invention and the antenna diversity receiving system according to the invention are described and explained in more detail with reference to the exemplary embodiment shown in the figure.

Je eine von fünf Antennen AI bis A5 ist mit einem Eingang eines AntennenwahlSchalter AS verbunden, dessen Ausgang mit dem Antenneneingang eines Funkempfängers E, eines Stördetektors D und einer Auswerteeinheit A verbunden ist. Der Steuerausgang des Stördetektors D ist mit dem Steuereingang der Auswerteeinheit A verbunden, deren Steuerausgang mit dem Steuereingang des AntennenwahlSchalters AS verbunden ist. Außerdem ist die Auswerteeinheit A mit einem Speicher S verbunden.One each of five antennas AI to A5 is connected to an input of an antenna selection switch AS, the output of which is connected to the antenna input of a radio receiver E, an interference detector D and an evaluation unit A. The control output of the interference detector D is connected to the control input of the evaluation unit A, the control output of which is connected to the control input of the antenna selection switch AS. In addition, the evaluation unit A is connected to a memory S.

In der Figur ist die Antenne AI über den Antennenwahlschalter AS an den Stördetektor D, die Auswerteeinheit A und den Funkempfänger E angeschlossen. Die Auswerteeinheit A ermittelt die Empfangsqualität der Antenne AI und speichert sie im Speicher S. Als Empfangsqualität kann beispielsweise die Empfangsfeldstärke dienen. Vorzugsweise wird die Empfangsfeidstärke in eine Spannung gewandelt, die auf einem als Speicher dienenden Kondensator gespeichert wird.In the figure, the antenna AI is connected to the interference detector D, the evaluation unit A and the radio receiver E via the antenna selector switch AS. The evaluation unit A determines the reception quality of the antenna AI and stores it in the memory S. The reception field strength, for example, can serve as reception quality. The reception field strength is preferably converted into a voltage which is stored on a capacitor which serves as a memory.

Sobald der Stδrdetektor D eine Störung detektiert, z.B. einen Amplitudeneinbruch, gibt er einen Steuerimpuls an die Auswerteeinheit A ab, die einen Steuerimpuls an den Antennenauswahl- Schalter AS gibt, der auf die nächste Antenne A2 umgeschaltet wird. Die Auswerteeinheit A ermittelt die Empfangsqualität der nun aufgeschalteten Antenne A2 und vergleicht sie mit der im Speicher S gespeicherten Empfangsqualität der Antenne AI. Ist die Empfangsqualität der gegenwärtig aufgeschalteten Antenne A2 größer als die der vorangegangenen Antenne AI, so bleibt die Antenne A2 aufgeschaltet. Ist aber auch die Empfangsqualität der gegenwärtig aufgeschalteten Antenne A2 nicht besser als die der Antenne AI, so gibt die Auswerteeinheit A einen weiteren Steuerimpuls an den Antennenauswahlschalter AS, der auf die nächste Antenne A3 umschaltet . Die Auswerteeinheit A speichert zuvor die Empfangsqualität der Antenne A2 im Speicher S. Nun vergleicht die Auswerteeinheit A die Empfangsqualität der jetzt aufgeschalteten Antenne A3 mit der im Speicher S gespeicherten Empfangsqualität der zuvor aufgeschalteten Antenne A2. Ist auch die Empfangsqualität der aufgeschalteten Antenne A3 nicht besser als der zuvor aufgeschalteten Antenne A2, so wird auf die nächste Antenne A4 geschaltet, bis schließlich eine Antenne mit einer besseren Empfangsqualität gefunden wird.As soon as the fault detector D detects a disturbance, for example a dip in amplitude, it sends a control pulse to the evaluation unit A, which gives a control pulse to the antenna selection switch AS, which is switched over to the next antenna A2. The evaluation unit A determines the reception quality of the antenna A2 now connected and compares it with the reception quality of the antenna AI stored in the memory S. If the reception quality of the currently connected antenna A2 is greater than that of the previous antenna AI, the antenna A2 remains connected. However, if the reception quality of the currently connected antenna A2 is not better than that of the antenna AI, the evaluation unit A sends a further control pulse to the antenna selection switch AS, which switches over to the next antenna A3. The evaluation unit A previously saves the reception quality of the antenna A2 in the memory S. Now the evaluation unit A compares the reception quality of the antenna A3 now connected with the reception quality stored in the memory S of the antenna A2 previously connected. If the reception quality of the connected antenna A3 is not better than that of the previously connected antenna A2, the next antenna A4 is switched on until an antenna with a better reception quality is finally found.

Wird in einem Durchlauf durch die Antennen AI bis A5 keine Antenne mit einer besseren Empfangsqualität gefunden, so bleibt die ursprünglich aufgeschaltete Antenne AI weiterhin aufgeschaltet .If no antenna with a better reception quality is found in a pass through the antennas AI to A5, the antenna AI originally switched on remains switched on.

Nach Ablauf einer vorgebbaren Zeitspanne wird erneut ein Suchlauf in der zuvor beschriebenen Weise gestartet und durchgeführt. Die Erfindung zeichnet sich durch den Vorteil aus, dass sie stets die augenblicklich beste Antenne findet und an den Eingang des Funkempfängers schaltet. Der Funkempfang ist daher immer so gut wie augenblicklich möglich, auch dann, wenn alle Antennen nur unzureichende Empfangsqualitäten liefern. After a predefinable period of time, a search is started and carried out again in the manner described above. The invention is distinguished by the advantage that it always finds the best antenna at the moment and switches it to the input of the radio receiver. Radio reception is therefore almost always possible, even if all antennas only provide insufficient reception qualities.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

A AuswerteeinheitA evaluation unit

AS AntennenwahlSchalterAS antenna selection switch

AI bis A5 AntenneAI to A5 antenna

D StördetektorD interference detector

E FunkempfängerE radio receiver

S Speicher S memory

Claims

? tentansprüche ? tentansprüche 1. Verfahren zur Auswahl einer von mehreren Antennen (AI bis A5) einer Antennendiversity-Empfangsanlage mit einem An- ennenwahlscha.lter (AS) , mit einer Auswerteeinheit (A) mit einem Stördetektor (S) und mit einem Funkempfänger (E) , d a d u r c h g e k e n n z e i c h n e t , dass die von der Auswerteeinheit (A) ermittelte • Empf ngsqualität der jeweils aufgeschalteten Antenne (AI) in einem Speicher (S) gespeichert wird, dass bei Detektion einer EmpfangsStörung durch den Stördetektor (D) so lange auf eine andere Antenne (AI bis A5) geschaltet wird, deren Empfangsqualität mit derjenigen der jeweils vorangehenden Antenne verglichen wird, bis eine Antenne mit einer besseren Empfangsqulität gefunden wird, dass aber, wenn keine Antenne mit einer besseren Empfangsqualität in einem Durchlauf aller Antennen (AI bis A5) gefunden wird, die urspüngliche Antenne (AI) aufgeschaltet bleibt.1. Method for selecting one of several antennas (AI to A5) of an antenna diversity reception system with an antenna selector switch (AS), with an evaluation unit (A) with an interference detector (S) and with a radio receiver (E), characterized that the ascertained by the evaluation unit (a) • Rec ngsqualität the respective bridged antenna (AI) in a memory (S) is stored, that upon detection of a reception disturbance by the disturbance detector (D) so long to another antenna (Al to A5 ) is switched, whose reception quality is compared with that of the respective previous antenna until an antenna with a better reception quality is found, but that if no antenna with a better reception quality is found in a run through all antennas (AI to A5), the original Antenna (AI) remains switched on. 2. Verfahren nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t , dass nach einem ergebnislosen Durchlauf aller Antennen (AI bis A5) nach einer vorgebbaren Zeitspanne ein weiterer Suchlauf gestartet wird.2. The method of claim 1, so that another search is started after an unsuccessful run of all antennas (AI to A5) after a predeterminable period of time. 3. Verfahren nach Anspruch 1 oder 2 , d a d u r c h g e k e n n z e i c h n e t , dass als Kriterium für die Empf angsqualität die Empf angsf e'ldstarke dient .3. The method of claim 1 or 2, characterized in that as a criterion for the receiver angsqualität the receiver angsf e 'ldstarke used. 4. Verfahren nach Anspruch 3 , d a d u r c h g e k e n n z e i c h n e t', dass die Empfangsqualität in eine Spannung gewandelt wird.4. The method according to claim 3, characterized in 'that the reception quality is converted into a voltage. 5. Verfahren nach Anspruch 4, d a d u r c h g e k e n n z e i c h n e t , dass die die Empfangsfeldstärke repräsentierende Spannung auf einem Kondensator gespeichert wird. 5. The method according to claim 4, characterized in that the voltage representing the received field strength is stored on a capacitor. 6. Verfahren nach einem der Ansprüche 1 bis 5, d a d u r c h g e k e n n z e i c h n e t , dass der Stördetektor (D) Amplitudeneinbrüche im Empfangssignal de- tektiert .6. The method according to any one of claims 1 to 5, that the interference detector (D) detects amplitude dips in the received signal. 55 7. Verfahren nach Anspruch 6 d a d u r c h g e k e n n z e i c h n e t , dass der Stördetektor (D) bei einem detektierten Amplitudeneinbruch einen Steuerimpuls abgibt, der den Antennenwahlschalter 10 (AS) betätigt.7. The method as claimed in claim 6, so that the interference detector (D) emits a control pulse when the amplitude drops, which actuates the antenna selector switch 10 (AS). 8. Antennendiversity-Empfangsanlage mit mehreren an die Eingänge eines Antennenwahlschalter (AS) angeschlossenen Antennen (AI bis A5) , dessen Ausgang mit dem Antenneneingang 15 eines Funkempfängers (E) verbunden ist, mit einer Auswer- teeinheit (A) und mit einem Stördetektor (D) , d a d u r c h g e k e n n z e i c h n e t , dass der Ausgang des Antennenwahlschalters (AS) mit dem Antenneneingang des Stördetektors (D) und der Auswerteeinheit (A) 20 verbunden ist, dass der Steuerausgang des Stδrdetektors (D) mit dem Steuereingang der Auswerteeinheit (A) verbunden ist, deren Steuereingang mit dem Steuereingang des Antennenwahlschalters (AS) verbunden ist, und dass die Auswerteeinheit (A) mit einem Speicher (S) verbunden ist.8. Antenna diversity reception system with several antennas (AI to A5) connected to the inputs of an antenna selector switch (AS), the output of which is connected to the antenna input 15 of a radio receiver (E), with an evaluation unit (A) and with an interference detector ( D), characterized in that the output of the antenna selector switch (AS) is connected to the antenna input of the interference detector (D) and the evaluation unit (A) 20, that the control output of the fault detector (D) is connected to the control input of the evaluation unit (A), whose control input is connected to the control input of the antenna selector switch (AS) and that the evaluation unit (A) is connected to a memory (S). _5_5 9. Antennendiversity-Empf angsanlage nach Anspruch 8, d a d u r c h g e k e n n z e i c h n e t , dass für den Speicher (S) ein Kondensator vorgesehen ist. 9. antenna diversity receiving system according to claim 8, d a d u r c h g e k e n n z e i c h n e t that a capacitor is provided for the memory (S).
PCT/EP2002/014197 2001-12-13 2002-12-13 Method for the selection of several antennae in an antenna diversity reception system and antenna diversity reception system Ceased WO2003050970A1 (en)

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DE4403612A1 (en) * 1994-02-05 1995-08-10 Lindenmeier Heinz Multiple antenna scanning diversity system circuitry
EP0755131A2 (en) * 1995-07-17 1997-01-22 Hagenuk Telecom GmbH Apparatus for controlling antennas
DE19935675A1 (en) * 1999-07-29 2001-02-15 Bosch Gmbh Robert Circuit for switching between receiving antennas

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US4230556A (en) * 1978-12-15 1980-10-28 Gulf Oil Corporation Integrated coal liquefaction-gasification process
DE3517247A1 (en) * 1985-05-13 1986-11-13 Gerhard Prof. Dr.-Ing. 8012 Ottobrunn Flachenecker ANTENNA DIVERSITY RECEIVING SYSTEM FOR ELIMINATION OF RECEIVING ERRORS
DE3938717A1 (en) * 1989-11-23 1991-05-29 Kolbe & Co Hans FM HF signal changeover switching - uses diversity functioning only when preset min.. signal level is present and specifically defined

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Publication number Priority date Publication date Assignee Title
US5430769A (en) * 1992-11-23 1995-07-04 Motorola, Inc. Method and apparatus for controlling switched antenna diversity systems
DE4403612A1 (en) * 1994-02-05 1995-08-10 Lindenmeier Heinz Multiple antenna scanning diversity system circuitry
EP0755131A2 (en) * 1995-07-17 1997-01-22 Hagenuk Telecom GmbH Apparatus for controlling antennas
DE19935675A1 (en) * 1999-07-29 2001-02-15 Bosch Gmbh Robert Circuit for switching between receiving antennas

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