DE4303979A1 - Car radio with antenna diversity - Google Patents

Car radio with antenna diversity

Info

Publication number
DE4303979A1
DE4303979A1 DE19934303979 DE4303979A DE4303979A1 DE 4303979 A1 DE4303979 A1 DE 4303979A1 DE 19934303979 DE19934303979 DE 19934303979 DE 4303979 A DE4303979 A DE 4303979A DE 4303979 A1 DE4303979 A1 DE 4303979A1
Authority
DE
Germany
Prior art keywords
diversity
antenna
tuner
circuit
receiver
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.)
Withdrawn
Application number
DE19934303979
Other languages
German (de)
Inventor
Dietmar Biere
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.)
Fuba Automotive GmbH and Co KG
Original Assignee
Hans Kolbe and Co
Fuba Hans Kolbe and Co
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 Hans Kolbe and Co, Fuba Hans Kolbe and Co filed Critical Hans Kolbe and Co
Priority to DE19934303979 priority Critical patent/DE4303979A1/en
Publication of DE4303979A1 publication Critical patent/DE4303979A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal

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

Abstract

In known diversity systems for mobile broadcast reception, in which the antenna signal processed in the IF section of the receiver is used for detecting interference in the diversity processor, a separate additional IF demodulator is required for the diversity circuit. Further disadvantages result from the more or less high expenditure of components, housings and RF lines and from losses and noise sources also associated therewith, depending on the arrangement of the individual components in the vehicle - antennas, amplifiers, diversity and receiver. According to the invention, the tuner (4) is spatially detached from the receiver and directly connected to the antenna outputs or moved into their vicinity. At the same time, the diversity circuit (2.2, 2.3) is integrated in the tuner. As a result, the demodulated IF signal of the tuner IF section (3.2, 3.3) can be connected directly to the diversity processor (2.2). No separate IF demodulator is required for the diversity circuit. Like the diversity elements, the amplifier sections (1.2) of the active antennas can also be integrated in the tuner model according to the invention. The advantages of the invention in the form of considerable reduction in components and cost have an optimum effect in a multi-antenna window in which the outputs of the passive antenna structures (1.1) are combined at one point and the tuner model (4) with integrated amplifier diversity circuit is [lacuna] in a member directly next to the window ... Original abstract incomplete. <IMAGE>

Description

Die Erfindung betrifft eine Autoradio-Anlage mit mehreren Antennen, insbesondere für den Meterwellen-Bereich, und mit Antennendiversity.The invention relates to a car radio system with several Antennas, especially for the meter wave range, and with Antenna diversity.

Bei bekannten Diversity-Systemen für den mobilen Rundfunk- Empfang, bei denen das im ZF-Teil des Empfängers aufbereitete HF-Signal der Antennen (Abgriff nach der Mischstufe) für die Störerkennung im Diversity-Prozessor verwendet wird, ist die Diversity-Schaltung mit einem eigenen ZF-Demodulator ausgestattet.In known diversity systems for mobile broadcasting Reception where the processed in the IF part of the receiver RF signal of the antennas (tap after the mixer) for the Disturbance detection is used in the diversity processor Diversity circuit with its own IF demodulator fitted.

Der Diversity-Prozessor steuert bei den selektiven Systemen (z. B. Scanning-Diversity) die Umschaltvorgänge zwischen den angeschlossenen Antennen in Abhängigkeit von vorgegebenen Schwellwerten für Störspitzen und Amplitude, mit denen auf der ZF-Ebene die störungsbedingten hochfrequenten Pulse und Amplitudeneinbrüche des jeweils durchgeschalteten Antennen­ signals verglichen werden.The diversity processor controls the selective systems (e.g. scanning diversity) the switching processes between the connected antennas depending on given Thresholds for interference peaks and amplitude with which on the ZF level the interference-related high-frequency pulses and Drop in amplitude of the antennas switched through signals are compared.

Bei anderen Systemen werden Summensignale gebildet.In other systems, sum signals are formed.

Die Diversityschaltung wird von den verschiedenen Herstellern - auch unter Berücksichtigung der möglichen oder gewünschten Verteilung der angeschlossenen Antennen am Fahrzeug - entwederThe diversity circuit is different from the Manufacturers - also taking into account the possible or desired distribution of the connected antennas on Vehicle - either

  • a) modular direkt an den Empfänger angeschlossen (dann können die Antennen überall am Fahrzeug verteilt sein) odera) modularly connected directly to the receiver (then you can the antennas are distributed all over the vehicle) or
  • b) in der unmittelbaren Nähe mehrerer, in einem Bereich (z. B. in der Heckscheibe) konzentrierter Antennen angeordnet, oderb) in the immediate vicinity of several, in one area (e.g. in the rear window) concentrated antennas arranged, or
  • c) es ist jeder einzelnen Antenne ein kompletter Tuner zugeordnet, und die Diversityschaltung ist an geeigneter Stelle eingefügt, entweder in der Nähe der Antennen oder modular mit dem verbleibenden Empfängerteil verbunden.c) it is a complete tuner for each individual antenna assigned, and the diversity circuit is more appropriate Place inserted, either near the antennas or modularly connected to the remaining receiver part.

Die meisten bekannten Prinzipe haben einen Nachteil gemeinsam: Der oft hohe Bauelemente- und schaltungstechnische bzw. zumindest Leitungsaufwand.Most of the known principles have a disadvantage together: the often high component and circuit technology or at least management effort.

Bei den Lösungen nach a und b sind jeweils - neben dem ZF- Demodulator des Tuners - zusätzliche ZF-Demodulatoren im Diversity und außerdem noch teure HF-Kabel erforderlich. Die Lösung nach c ist allein schon durch die Verwendung gleich mehrerer vollständiger Tuner schaltungsmäßig noch aufwendiger.In the solutions according to a and b - in addition to the ZF Demodulator of the tuner - additional ZF demodulators in the Diversity and also expensive RF cables required. The solution according to c is by the use alone several complete tuners in terms of circuitry more complex.

Der Erfindung liegt die Aufgabe zugrunde, den Bauteile- und Schaltungsaufwand für Antennendiversity, auch unter Berücksichtigung des heute möglichen Systemcharakters der Radioanlage in einem Kraftfahrzeug, zu senken.The invention has for its object the component and Circuit expenditure for antenna diversity, also under Taking into account the possible system character of the Lower radio system in a motor vehicle.

Diese Aufgabe wird erfindungsgemäß mit den im kennzeichnenden Teil des Hauptanspruchs angegebenen Merkmalen gelöst. Die Unteransprüche enthalten bevorzugte Ausführungsvarianten der Erfindung.This object is achieved with the in the characterizing Part of the main claim specified features solved. The Subclaims contain preferred variants of the Invention.

Bei der erfindungsgemäßen Lösung wird der Tuner als Modul räumlich aus dem Empfänger gelöst und mit den Antennen­ ausgängen direkt verbunden bzw. in ihre unmittelbare Nähe gerückt. Auf diese Weise wird HF-Kabel eingespart. Durch Integration der Diversityschaltung in den Tuner kann auf elegante Weise auf einen ZF-Demodulator verzichtet werden, weil der Diversity-Prozessor das demodulierte ZF-Signal des Tuners-ZF-Teils übernimmt.In the solution according to the invention, the tuner is used as a module spatially separated from the receiver and with the antennas exits directly connected or in their immediate vicinity moved. This saves RF cables. By Integration of the diversity circuit in the tuner can be done an elegant way to do without a ZF demodulator, because the diversity processor the demodulated IF signal of the Tuners ZF part takes over.

Die Einfügung weiterer Funktionseinheiten bzw. Bauelemente in das Tunermodul, z. B. eines oder mehrerer Antennenverstärker, stellt die konsequente Fortsetzung des Integrationsgedankens dar und bietet zusätzliche Vorteile - vorausgesetzt, der oder die Abstände zwischen den Ausgängen der passiven Antennen­ teile und den Verstärkereingängen werden entsprechend gering gehalten.The insertion of further functional units or components in the tuner module, e.g. B. one or more antenna amplifiers, represents the consistent continuation of the idea of integration and offers additional benefits - provided the or the distances between the outputs of the passive antennas parts and the amplifier inputs are correspondingly low held.

All dies zusammengenommen, kann als eine besonders vorteilhafte Ausführung der Erfindung die Mehrantennen­ struktur in einer Kfz-Scheibe, z. B. der Heckscheibe, und die Anordnung des mit der Diversityschaltung und weitgehend mit Verstärkerschaltungen erweiterten Tuners unmittelbar neben der Antennenscheibe, z. B. in einem der Scheibe benachbarten Seitenholm, bezeichnet werden.All of this taken together can be special advantageous embodiment of the invention, the multiple antennas structure in a motor vehicle window, e.g. B. the rear window, and the  Arrangement of the with the diversity circuit and largely with Amplifier circuits extended tuners right next to it the antenna disc, e.g. B. in one adjacent to the disc Side rail.

Die Erfindung wird im folgenden an Hand eines Ausführungs­ beispiels näher erläutert. In der zugehörigen Zeichnung zeigenThe invention is described below with the aid of an embodiment example explained in more detail. In the accompanying drawing demonstrate

Fig. 1 Schaltungsaufbau für Antennendiversity gemäß dem Stand der Technik, Fig. 1 circuit configuration for antenna diversity according to the prior art,

Fig. 2 Erfindungsgemäße Schaltung. Fig. 2 circuit according to the invention.

In Fig. 1 besteht die Diversityschaltung 2 aus dem ZF- Demodulator 2.1, dem Prozessor 2.2 und der elektronischen Schalteinheit 2. 3.In FIG. 1, the diversity circuit 2 consists of the IF demodulator 2.1 , the processor 2.2 and the electronic switching unit 2 . 3rd

Das HF-Signal der jeweils aktuellen Antenne 1 aus passivem Antennenteil 1.1 und Verstärkerteil 1.2 wird über die zugehörige PIN-Diode auf das HF-Teil 3.1 des Empfängers durchgeschaltet.The RF signal of the current antenna 1 consisting of passive antenna part 1.1 and amplifier part 1.2 is switched through to the HF part 3.1 of the receiver via the associated PIN diode.

Der der Mischstufe 3.2 des Tuners 3 entnommene und dem Diversity 2 zugeleitete ZF-Signalanteil, der das spektrale Abbild des gerade durchgeschalteten Antennensignals darstellt, wird über den Demodulator 2.1 dem Prozessor 2.2 zugeführt.The IF signal component, which is taken from the mixer stage 3.2 of the tuner 3 and supplied to the diversity 2 and which represents the spectral image of the antenna signal which has just been switched through, is fed to the processor 2.2 via the demodulator 2.1 .

Bei Überschreiten von Schwellwerten des Referenzsignals wird der Impuls zum Umschalten auf die der aktuellen Antenne in der Reihung folgende Antenne erzeugt.If threshold values of the reference signal are exceeded the impulse to switch to that of the current antenna in antenna following the sequence.

Bei dieser Anordnung werden HF-Kabel entsprechend der Entfernung zwischen der Diversityschaltung 2 und dem Empfänger - und evtl. zwischen einzelnen Antennen 1 und dem Diversity 2 - und der zusätzliche ZF-Demodulator 2.1 in der Diversityschaltung 1 benötigt.With this arrangement, RF cables corresponding to the distance between the diversity circuit 2 and the receiver - and possibly between individual antennas 1 and the diversity 2 - and the additional IF demodulator 2.1 are required in the diversity circuit 1 .

Bei der erfindungsgemäßen Anlage nach Fig. 2 mit einer in der Heckscheibe eines Pkw angeordneten Struktur passiver Antennenteile 1.1 bildet der Tuner mit dem Diversityprozessor 2.2 und der Schalteinheit 2.3 ein komplexes Modul 4 in einem gemeinsamen Gehäuse, das in den C-Holm des Fahrzeugs integriert sein kann. In the system according to the invention according to FIG. 2 with a structure of passive antenna parts 1.1 arranged in the rear window of a car, the tuner with the diversity processor 2.2 and the switching unit 2.3 forms a complex module 4 in a common housing which is integrated in the C-pillar of the vehicle can.

Das Modul 4 ist mit HF-Eingangsschnittstellen zu den aktiven Antennen 1, der NF-Schnittstelle zu den übrigen Empfänger- Komponenten und der Schnittstelle für die Abstimmspannung versehen. Je nach der Ausbildung der Antennenstruktur 1.1 in der Scheibe und der Anordnung der Verstärkerschaltungen 1.2 sind auch zwischen den Verstärkerausgängen der Antennen und den HF-Eingängen des Moduls 4 keine HF-Kabel erforderlich.The module 4 is provided with RF input interfaces to the active antennas 1 , the NF interface to the other receiver components and the interface for the tuning voltage. Depending on the design of the antenna structure 1.1 in the pane and the arrangement of the amplifier circuits 1.2 , no RF cables are required between the amplifier outputs of the antennas and the RF inputs of the module 4 .

Bei einer räumlichen Zusammenfassung der Antennenausgänge, wie sie durch die Mehrantennenstruktur auf der Scheibe möglich ist, bietet sich darüber hinaus die zusätzliche Integration der Verstärkerteile 1.2 in das Modul 4 an. Diese Möglichkeit ist schematisch mit der Linie 5 in Fig. 2 angedeutet.In the case of a spatial combination of the antenna outputs, as is possible due to the multi-antenna structure on the pane, the additional integration of the amplifier parts 1.2 into the module 4 also lends itself. This possibility is indicated schematically by line 5 in FIG. 2.

Claims (3)

1. Autoradio mit Antennen-Diversity, gekennzeichnet durch die folgenden Merkmale:
  • - die Diversity-Schaltung, bestehend aus dem Diversity- Prozessor (2.2) und der elektronischen Schalteinheit (2.3), ist in den Tuner (4) des Empfängers integriert, wobei für die Störerkennung im Diversity-Prozessor (2.2) das ZF-Signal aus dem ZF-Demodulator (3.3) des Tuners (4) verwendet wird.
  • - der Tuner (4) mit Diversity-Schaltung (2.2; 2.3) ist als separates, räumlich von den übrigen Empfängerkomponenten getrenntes Modul am Ausgang einer Antenne (1) oder an den räumlich zusammengefaßten Ausgängen mehrerer Antennen (1) angeordnet.
1. Car radio with antenna diversity, characterized by the following features:
  • - The diversity circuit, consisting of the diversity processor ( 2.2 ) and the electronic switching unit ( 2.3 ), is integrated in the tuner ( 4 ) of the receiver, with the IF signal for interference detection in the diversity processor ( 2.2 ) the IF demodulator ( 3.3 ) of the tuner ( 4 ) is used.
  • - The tuner ( 4 ) with diversity circuit ( 2.2 ; 2.3 ) is arranged as a separate, spatially separate module from the other receiver components at the output of an antenna ( 1 ) or at the spatially combined outputs of several antennas ( 1 ).
2. Autoradio mit Antennendiversity nach Anspruch 1, dadurch gekennzeichnet, daß der Tuner (4) mit integrierter Diversity-Schaltung (2.2; 2.3) im Bereich der Antennen­ ausgänge einer Mehrantennenscheibe des Fahrzeugs angeordnet ist.2. Car radio with antenna diversity according to claim 1, characterized in that the tuner ( 4 ) with an integrated diversity circuit ( 2.2 ; 2.3 ) in the region of the antenna outputs of a multi-antenna pane of the vehicle is arranged. 3. Autoradio mit Antennendiversity nach Anspruch 1, dadurch gekennzeichnet, daß der Antennenverstärker (1.2) einer aktiven Antenne (1) oder die Verstärkerteile (1.2) mehrerer aktiver Antennen (1) zusätzlich zur Diversity- Schaltung (2.2; 2.3) in den Tuner (4) integriert sind.3. Car radio with antenna diversity according to claim 1, characterized in that the antenna amplifier ( 1.2 ) an active antenna ( 1 ) or the amplifier parts ( 1.2 ) of several active antennas ( 1 ) in addition to the diversity circuit ( 2.2 ; 2.3 ) in the tuner ( 4 ) are integrated.
DE19934303979 1993-02-11 1993-02-11 Car radio with antenna diversity Withdrawn DE4303979A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19934303979 DE4303979A1 (en) 1993-02-11 1993-02-11 Car radio with antenna diversity

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19934303979 DE4303979A1 (en) 1993-02-11 1993-02-11 Car radio with antenna diversity

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DE4303979A1 true DE4303979A1 (en) 1994-08-18

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000024138A1 (en) * 1998-10-21 2000-04-27 Robert Bosch Gmbh Radio receiving system and method for operating the same
DE19905158A1 (en) * 1999-02-08 2000-08-24 Becker Gmbh Radio receiver using frequency diversity for optimizing reception characteristics has multi-path detector that initiates control signal for selecting new antenna/tuner combination
EP0952674A3 (en) * 1998-04-24 2003-09-03 Harada Industry Co., Ltd. Reception control system for automobiles

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0201977A2 (en) * 1985-05-13 1986-11-20 Koninklijke Philips Electronics N.V. Antenna diversity reception arrangement for eliminating reception disturbances
DE4105599C1 (en) * 1991-02-22 1992-09-17 Blaupunkt-Werke Gmbh, 3200 Hildesheim, De Diversity device for VHF car radio having several antennae - synchronises oscillator to antenna noise signals in mixer using automatic search stage and converts output of adder to carry frequency

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0201977A2 (en) * 1985-05-13 1986-11-20 Koninklijke Philips Electronics N.V. Antenna diversity reception arrangement for eliminating reception disturbances
DE4105599C1 (en) * 1991-02-22 1992-09-17 Blaupunkt-Werke Gmbh, 3200 Hildesheim, De Diversity device for VHF car radio having several antennae - synchronises oscillator to antenna noise signals in mixer using automatic search stage and converts output of adder to carry frequency

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ntz, 1990, Bd. 43, H. 7, S. 551-553 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0952674A3 (en) * 1998-04-24 2003-09-03 Harada Industry Co., Ltd. Reception control system for automobiles
WO2000024138A1 (en) * 1998-10-21 2000-04-27 Robert Bosch Gmbh Radio receiving system and method for operating the same
DE19905158A1 (en) * 1999-02-08 2000-08-24 Becker Gmbh Radio receiver using frequency diversity for optimizing reception characteristics has multi-path detector that initiates control signal for selecting new antenna/tuner combination
DE19905158B4 (en) * 1999-02-08 2006-03-09 Harman Becker Automotive Systems (Becker Division) Gmbh Radio receiver

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OM8 Search report available as to paragraph 43 lit. 1 sentence 1 patent law
8127 New person/name/address of the applicant

Owner name: FUBA AUTOMOTIVE GMBH, 31162 BAD SALZDETFURTH, DE

8110 Request for examination paragraph 44
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Owner name: FUBA AUTOMOTIVE GMBH & CO. KG, 31162 BAD SALZDETFU

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8127 New person/name/address of the applicant

Owner name: DELPHI DELCO ELECTRONICS EUROPE GMBH, 42119 WU, DE

8130 Withdrawal