DE3227732C2 - Procedure for reducing adjacent channel interference in FM transmitter networks - Google Patents
Procedure for reducing adjacent channel interference in FM transmitter networksInfo
- Publication number
- DE3227732C2 DE3227732C2 DE3227732A DE3227732A DE3227732C2 DE 3227732 C2 DE3227732 C2 DE 3227732C2 DE 3227732 A DE3227732 A DE 3227732A DE 3227732 A DE3227732 A DE 3227732A DE 3227732 C2 DE3227732 C2 DE 3227732C2
- Authority
- DE
- Germany
- Prior art keywords
- transmitter
- adjacent channel
- channel interference
- signal
- procedure
- 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
Links
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
- H04H20/48—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 FM stereophonic broadcast systems
-
- 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
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B1/0475—Circuits with means for limiting noise, interference or distortion
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
- Transmitters (AREA)
Abstract
Zur Reduzierung der Nachbarkanalstörungen in FM-Sendernetzen wird vorgeschlagen, daß die Leistung jedes Senders in Abhängigkeit von dem Pegel des gesendeten NF-Signals gesteuert wird, derart, daß die Sendeleistung mit zunehmender Aussteuerung der Modulation verringert wird.To reduce adjacent channel interference in FM transmitter networks, it is proposed that the power of each transmitter be controlled as a function of the level of the transmitted LF signal, in such a way that the transmission power is reduced as the modulation level increases.
Description
tragungsqualität z. B. mit Hilfe von Kompander-Verfahren sind bereits untersucht worden.wear quality z. B. with the help of compander method have already been investigated.
Die Qualitätsverbesserung durch die Kompandierung ist darauf zurückzuführen, daß Geräusche dann reduziert werden, s'snn sie tatsächlich stören, d. h. wenn sie nicht durch en» starke Nutzmodulation verdeckt werden. Bei Vollaussteuerung werden die übertragungsbedingten Störungen (Rauschen, Interferenzen) nicht abgesenkt The improvement in quality through companding is due to the fact that noise is then reduced if they are actually disturbing, d. H. If you are not covered by strong useful modulation. At full level, the transmission-related disturbances (noise, interference) are not reduced
subjektiv nicht oder nur schwach wahrgenommen (sog. Verdeckung), so daß bei großen Modulationspegeln übertragungsbedingte Störungen weniger stark unterdrückt zu werden brauchen, mit der Folge, daß die angebotene HF-Leistung reduziert werden kann. Obwohl man zunächst erwarten sollte, daß durch diese Maßnahme der Empfang verschlechtert wird, zeigt sich, daß diese Verschlechterung subjektiv nicht wahrnehmbar ist Die durch die Veränderung der Sendeleistung her-Subjectively not or only weakly perceived (so-called masking), so that with high modulation levels Transmission-related interference need to be suppressed less strongly, with the result that the offered RF power can be reduced. Although one should initially expect by this measure the reception is deteriorated, it turns out that this deterioration is subjectively imperceptible is the result of the change in the transmission power
4040
Bei bekannten Kompander-Verfahren (Rundfunk- 25 vorgerufenen HF-Pegelschwankungen am Empfänger
technische Mitteilungen, 1978, Heft 2, S. 63—74) wird führen ebenfalls zu keinen Qualitätseinbußen, da die
das Modulationssignal (z. B. NF-Signale) kompandiert UKW-Empfänger ge,jenüber diesen Schwankungen un-Der
Gewinn an Übertragungsqualität wird dadurch er- empfindlich sind. Der wesentliche Vorteil der Erfindung
zielt, daß bei niedrigen NF-Pegeln das Modulationssi- beruht darauf, daß infolge der Abregelung der HF-Sengnal
angehoben wird (Kompression). Dadurch weisen 30 deleistung bei großen Modulationspegeln die Störwirdiese
Signale ei^en größeren Abstand zu den übertra- kung auf die Nachbarkanäle beträchtlich reduziert wird,
gungsbedingien Störungen auf. Erst mit der empfangsseitigen Absenkung der HF-Signs<e bei kleinen Pegeln
(Expansion) wird eine Reduzierung der hörbaren Störgeräusche erreichtIn the case of known compander methods (radio frequency fluctuations at the receiver technical messages, 1978, No. 2, pp. 63-74), quality is not impaired either, since the modulation signal (e.g. LF signals) is companded VHF receivers are sensitive to these fluctuations. The main advantage of the invention is that, at low LF levels, the modulation signal is based on the fact that the HF signal is increased (compression) as a result of the down-regulation. This means that if the modulation levels are high, the interference will result in these signals being considerably reduced if the distance to the transmission to the adjacent channels is greater, due to interference. Only with the lowering of the RF signals on the receiving side at low levels
(Expansion) a reduction in audible background noise is achieved
Die bekannten Kompanderverfahren sind indessen mit bestehenden Empfangsanlagen nicht vollständig kompatibel, da sie empfangsseitige Zusatzeinrichtungen (z. B. Expander) benötigen.The known compander methods, however, are not complete with existing receiving systems Compatible, as they require additional equipment on the receiving side (e.g. expanders).
Die Aufgabe der Erfindung besteht darin, ein Verfahren anzugeben, welches das Modulationssignal unbeeinflußt läßt und die Qualitätsverbesserung über eine echte Reduzierung der übertragungsbedingten Störungen erreicht. The object of the invention is to provide a method which does not affect the modulation signal and the quality improvement is achieved through a real reduction in the transmission-related interference.
Diese Aufgabe wird erfindungsgemäß durch die kennzeichnenden Merkmale des Patentanspruchs gelöst. According to the invention, this object is achieved by the characterizing features of the patent claim.
Bei einem Gleichwellenfunknetz ist es bereits bekannt (DE-OS 29 31 923), die Leistung einer RelaisstelleIn a single-frequency radio network, it is already known (DE-OS 29 31 923), the performance of a relay station
in Abhängigkeit von dem an ihrem Standort jeweils 50 führt werden. Das HF-Signal am Ausgang des FM-Moempfangbaren HF-Pegel zu steuern. Mit der erfin- dulators 22 gelangt auf eine HF-Leistungsendstufe 23, dungsgemäßen Steuerung in Abhängigkeit vom Pegel . . - -depending on the 50 leads at their location. The RF signal at the output of the FM-Mo can be received Control RF levels. With the inventor 22 arrives at an HF power output stage 23, proper control depending on the level. . - -
des modulierenden Signals (NF-Signal) bestehen indessen wegen der fehlenden Korrelation zwischen dem Modulationssignal und dem HF-Empfangssignal keinerlei Berührungspunkte.of the modulating signal (LF signal) exist because of the lack of correlation between the The modulation signal and the RF received signal have no points of contact.
Dem Erfindungsgedanken liegen folgende Überlegungen zugrunde:The idea of the invention is based on the following considerations:
Die Grenzen der Versorgungsgebiete der UKW-Sender in der BRD sind in erster Linie durch Gleich- und Nächbafkänalstörungen gegeben. Erfahrungsgemäß spielen dabei die Störungen von Sendern mit relativ kleinem Frequenzabstand die entscheidende Rolle. In diesem Bereich aber hängt die Störwirkung von der Aussteuerung der Modulation des Störsenders ab. Insbesondere dann, wenn der Störsender vom Nutzsender Bei Anwendung des erfindungsgemäßen Verfahrens auf ein Sendernetz ergibt sich ein beträchtlicher Gewinn an ÜbertragungsqualitätThe boundaries of the coverage areas of the VHF transmitters in the FRG are primarily by equal and Next channel disturbances given. Experience has shown that the interference from transmitters has a relative effect small frequency spacing plays a decisive role. In this area, however, the disruptive effect depends on the Control of the modulation of the jammer. In particular if the jammer is from the useful transmitter When the method according to the invention is applied to a transmitter network, there is a considerable gain Transmission quality
Als weiterer Vorteil wird durch die vorgeschlagene Leistungssteuerung der Leistungsverbrauch der Sender reduziert. Die Einsparungen sind von der Programmen abhängig und liegen zwischen 10°/o und 20%.Another advantage of the proposed power control is the power consumption of the transmitters reduced. The savings depend on the program and are between 10% and 20%.
Die Figur zeigt eine Anordnung -j'ir Durchführung des erfindungsgemäßen Verfahrens.The figure shows an arrangement for implementation of the method according to the invention.
In der Figur ist mit 10 eine NF-Signalquelle bezeichnet, die beispielsweise durch ein Tonstudio gebildet ist. Das stereofone NF-Signal am Ausgang der Quelle 10 umfaßt eine Linksinformation L und eine Rechtsinformation R. Die L- und /?-Signale werden in dem Sender 20 zunächst einem Stereocoder 21 zugeführt, welcher in bekannter Weise aus den L- und Λ-Signalen ein Summen- und Differenzsignal bildet, welche in Form eines Multiplexsignales MPX einem FM-Modulator 22 zuge-In the figure, 10 denotes an LF signal source, which is formed, for example, by a sound studio. The stereophonic LF signal at the output of the source 10 comprises left information L and right information R. The L and /? Signals are first fed in the transmitter 20 to a stereo encoder 21, which is made from the L and Λ signals in a known manner a sum and difference signal forms which Certified in the form of a multiplex signal MPX an FM modulator 22
welche die Sendeantenne 24 speist.which feeds the transmitting antenna 24.
Der insoweit beschriebene Aufbau der Anordnung gemäß der Figur ist bekannt.The structure of the arrangement according to the figure described so far is known.
Wesentlich ist vielmehr, daß die beiden Ausgangskanäle der NF-Signalquelle 10 des weiteren mit einem Pegeldetektor 25 verbunden sind, welcher beispielsweise die L- und /?-Signale abtastet und speichert oder integriert, um ein Regelsignal für einen Leistungsregler 26 zu erzeugen. Der Leistungsregler ist mit einem Steuereingang der HF-Leistungs-Endstufe 23 verbunden, um in Abhängigkeit von dem Pegel am Ausgang der NF-Signalquelle 10 die Ausgangsleistung des Senders 20 zu steuern.Rather, it is essential that the two output channels of the LF signal source 10 are also connected to a level detector 25 which, for example, scans and stores or integrates the L and /? Signals in order to generate a control signal for a power regulator 26. The power regulator is connected to a control input of the HF power output stage 23 in order to control the output power of the transmitter 20 as a function of the level at the output of the LF signal source 10.
5555
6060
einen Frequenzabstand von etwa 100 kHz hat, sieigt die Störwirkung mit zunehmender Ansteuerung seiner Mo-Hierzu 1 Blatt Zeichnungenhas a frequency spacing of about 100 kHz, the interfering effect diminishes with increasing control of its Mo-For this purpose 1 sheet of drawings
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3227732A DE3227732C2 (en) | 1982-07-24 | 1982-07-24 | Procedure for reducing adjacent channel interference in FM transmitter networks |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3227732A DE3227732C2 (en) | 1982-07-24 | 1982-07-24 | Procedure for reducing adjacent channel interference in FM transmitter networks |
Publications (2)
Publication Number | Publication Date |
---|---|
DE3227732A1 DE3227732A1 (en) | 1984-02-02 |
DE3227732C2 true DE3227732C2 (en) | 1985-01-24 |
Family
ID=6169260
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE3227732A Expired DE3227732C2 (en) | 1982-07-24 | 1982-07-24 | Procedure for reducing adjacent channel interference in FM transmitter networks |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE3227732C2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4236386C1 (en) * | 1992-10-28 | 1994-05-26 | Inst Rundfunktechnik Gmbh | Monitoring FM radio transmitter - detecting mean power level of modulation multiplex signal to prevent over-modulation |
DE4324304A1 (en) * | 1993-07-20 | 1995-01-26 | Becker Gmbh | Method for suppressing reception interference in an FM receiver |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2931923C2 (en) * | 1979-08-07 | 1983-02-03 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Single-frequency radio network |
-
1982
- 1982-07-24 DE DE3227732A patent/DE3227732C2/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4236386C1 (en) * | 1992-10-28 | 1994-05-26 | Inst Rundfunktechnik Gmbh | Monitoring FM radio transmitter - detecting mean power level of modulation multiplex signal to prevent over-modulation |
DE4324304A1 (en) * | 1993-07-20 | 1995-01-26 | Becker Gmbh | Method for suppressing reception interference in an FM receiver |
DE4324304B4 (en) * | 1993-07-20 | 2005-01-27 | Harman Becker Automotive Systems (Becker Division) Gmbh | Method for suppressing interference in an FM receiver |
Also Published As
Publication number | Publication date |
---|---|
DE3227732A1 (en) | 1984-02-02 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
OP8 | Request for examination as to paragraph 44 patent law | ||
D2 | Grant after examination | ||
8364 | No opposition during term of opposition | ||
8320 | Willingness to grant licences declared (paragraph 23) | ||
8339 | Ceased/non-payment of the annual fee |