WO1991014314A1 - Process for the mobile reception of digital signals - Google Patents

Process for the mobile reception of digital signals Download PDF

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Publication number
WO1991014314A1
WO1991014314A1 PCT/EP1990/002290 EP9002290W WO9114314A1 WO 1991014314 A1 WO1991014314 A1 WO 1991014314A1 EP 9002290 W EP9002290 W EP 9002290W WO 9114314 A1 WO9114314 A1 WO 9114314A1
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WO
WIPO (PCT)
Prior art keywords
data signal
signals
switchover
interference
signal
Prior art date
Application number
PCT/EP1990/002290
Other languages
German (de)
French (fr)
Inventor
Dieter Schenkyr
Walter Buck
Original Assignee
Richard Hirschmann Gmbh & 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 Richard Hirschmann Gmbh & Co. filed Critical Richard Hirschmann Gmbh & Co.
Publication of WO1991014314A1 publication Critical patent/WO1991014314A1/en
Priority to FI915345A priority Critical patent/FI915345A0/en

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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
    • H04B7/0868—Hybrid systems, i.e. switching and combining
    • H04B7/0874—Hybrid systems, i.e. switching and combining using subgroups of receive antennas
    • 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
    • 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
    • H04B7/0868—Hybrid systems, i.e. switching and combining
    • H04B7/0871—Hybrid systems, i.e. switching and combining using different reception schemes, at least one of them being a diversity reception scheme
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity

Definitions

  • the invention relates to a method for mobile reception of digital signals, with a plurality of individual receiving antennas, in which a switch is made between individual antenna signals and / or signals formed from linear combinations of antenna signals.
  • reception interference occurs which considerably impair reception.
  • Such interference is based on the radiation of radio or television waves from more than one direction onto the antenna.
  • This so-called multi-path reception occurs because the radio or television waves not only reach the antenna directly from the transmitter, but are reflected, for example, on buildings and also reach the receiving antenna in other ways.
  • the reception paths for the several signals picked up by the reception antenna are of different lengths, so that interference interference occurs in the radio or television signal, which results in annoying reception disturbances which considerably impair reception.
  • SPARE BLADE 38 14 899 which go back to the same inventor as the present method, furthermore, diversity methods are known in which the phases and / or amplitudes of the high-frequency individual signals are changed by an internal switching clock depending on previously determined phase positions and / or amplitude contributions by one to achieve better reception quality with mobile systems.
  • Switchover processes therefore occur in all such mobile reception methods based on the diversity method. These change abruptly the amplitude and / or phase of the received signal, so that interference signals and impulses arise which can assume very high values.
  • these interference signals caused by the switching processes lead, for example, to crackling noises, which may adversely affect the reception quality, but are not critical, since these are, for example, opposite other interference are less important in practice compared to tuft disorders.
  • the redundancy of the transmission method is sufficient in most cases to identify and eliminate the interference signals caused by the switching processes.
  • interference signals or pulses caused by the switching processes are significantly more critical due to the abruptly changing amplitude and / or phase. Due to the transient processes, pulse edges can arise that cannot be distinguished from the edges of the digital pulses. If such an interference pulse occurs at critical points in the digital transmission signal, for example when so-called highly significant bits (MSB-most significant bits) occur or at other particularly relevant points in the digital transmission signal , the transmission of an entire data block can be disturbed.
  • MSB-most significant bits An example of mobile digital data transmission is, for example, the so-called radio data system (RDS), which is used for station identification in the FM range. Further data services with digital data transmission are planned. All of these digital transmission methods therefore suffer critically from the said interference signals when diversity methods are used.
  • the invention is therefore based on the object of creating a method of the type mentioned at the outset which does not have the disadvantages of conventional methods and in particular enables reliable reception of digital signals with a wide variety of types of diversity systems.
  • the object is achieved in that an interference pulse occurring during the switching is orthogonal to the pulses of the data signal.
  • the measure according to the invention to place the interference pulse occurring when switching over orthogonal to the data signal, enables averaging in an evaluation circuit. This avoids the fact that the interference pulses occurring due to the switching cause interference in the data bits to be received.
  • the orthogonality between the interference pulse and the data signal is formed by the choice of the point in time for the switchover between the individual antenna signals.
  • the standing pulse is influenced in such a way that the interference pulse is orthogonal to the pulses of the data signal, that is to say is averaged in the detector filter.
  • the interference signal occurs during a less relevant part of the data signal.
  • the occurrence of the pulse occurring during the switchover process can be optimally selected with regard to its temporal position, such that the data signal or the useful signal is influenced as little as possible by the switchover signal.
  • the digital signals to be transmitted and received have, for example, a certain word form, for example a 16-bit word form. These word forms include low-significant and highly significant bits, also known as LSB (low significant bit) and MSB (most significant bit).
  • a suitable choice of the occurrence of the switchover pulse in the region of the insignificant bits ensures that the data signal, if any, is influenced only insignificantly or uncritically, so that the highly significant bits and thus the total useful signal, if any, are only insignificantly affected by the occurrence of switchover signals to be disturbed. This is particularly important if the transmission path in the receiving device, e.g. B. the intermediate frequency filter, no orthogonal to the pulses of the data signal allows pulse shape or this pulse shape can only be generated imperfectly.
  • the switchover timing cycle is adapted to the transmission cycle of the data signal.
  • This embodiment is particularly advantageous in a diversity system known from DE-Al 37 37 011 if the transmission clock of the data signal is higher than the switchover clock. In this case, synchronization can take place on the block frame.
  • the Switching point outside a time window containing decision times. This is particularly advantageous if the transmission clock of the data signal is slower than the changeover clock. In the case of a relatively small transmission clock of the data signal, a certain time window can be left out in such a way that the switchover disturbance is kept away from the decision times, for example.

Abstract

The process described for the mobile diversity reception of digital signals by means of several individual antennas calls for the noise pulse which occurs on switching between the individual antenna signals to be orthogonal to the data signal being received. Orthogonality can be ensured by the choice of switchover time, phase and/or amplitude-curve shape. In addition, the time at which the noise pulse occurs can be chosen so that it is in a less important part of the data signal or outside time window containing decision times.

Description

Verfahren zum mobilen Empfang von digitalen Signalen Process for the mobile reception of digital signals
Die Erfindung betrifft ein Verfahren zum mobilen Empfang von digitalen Signalen, mit mehreren einzelnen Empfangsantennen, bei dem zwischen einzelnen Antennensignalen und/oder aus Li¬ nearkombinationen von Antennensignalen gebildeten Signalen umgeschaltet wird.The invention relates to a method for mobile reception of digital signals, with a plurality of individual receiving antennas, in which a switch is made between individual antenna signals and / or signals formed from linear combinations of antenna signals.
Beim mobilen Empfang, beispielsweise beim Empfang von Rundfunk und/oder Fernsehsendungen in Kraftfahrzeugen, treten Empfangs¬ störungen auf, die den Empfang erheblich beeinträchtigen. Der¬ artige Empfangsstörungen beruhen auf der Einstrahlung von Rundfunk- bzw. Fernsehwellen aus mehr als einer Richtung auf die Antenne. Dieser sogenannte Mehrwegeempfang tritt dadurch auf, daß die Rundfunk- bzw. Fernsehwellen nicht nur vom Sender direkt zur Antenne gelangen, sondern beispielsweise an Gebäu¬ den reflektiert werden und auf anderen Wegen ebenfalls die Empfangsantenne erreichen. Die Empfangswege für die mehreren, von der Empfangsantenne aufgenommenen Signale sind unter¬ schiedlich lang, so daß im Rundfunk- bzw. Fernsehsignal Inter¬ ferenzstörungen auftreten, die lästige, den Empfang erheblich beeinträchtigende Empfangsstörungen ergeben.In the case of mobile reception, for example when receiving radio and / or television broadcasts in motor vehicles, reception interference occurs which considerably impair reception. Such interference is based on the radiation of radio or television waves from more than one direction onto the antenna. This so-called multi-path reception occurs because the radio or television waves not only reach the antenna directly from the transmitter, but are reflected, for example, on buildings and also reach the receiving antenna in other ways. The reception paths for the several signals picked up by the reception antenna are of different lengths, so that interference interference occurs in the radio or television signal, which results in annoying reception disturbances which considerably impair reception.
Zur Vermeidung derartiger Nachteile sind sogenannte Diversi- ty-Empfangsverfahren bekannt, wie sie beispielsweise in einem Aufsatz von R. Heidester und K. Vogt in NTZ 58, Heft 6, Seiten 315-319, in der EP-A2-0 201 977, der DE-A2 33 44 735, der Zeitschrift "Funkschau", 1986, Seiten 42-45, beschrieben sind. Aus der DE-Al-38 36 046.2, der DE-Al-38 14 900 und der DE-Al-To avoid such disadvantages, so-called diversity reception methods are known, as described, for example, in an essay by R. Heidester and K. Vogt in NTZ 58, number 6, pages 315-319, in EP-A2-0 201 977, the DE-A2 33 44 735, the magazine "Funkschau", 1986, pages 42-45. From DE-Al-38 36 046.2, DE-Al-38 14 900 and DE-Al-
ERSATZBLÄTT 38 14 899, die auf dieselben Erfinder wie das vorliegende Verfahren zurückgehen, sind weiterhin Diversity-Methoden bekannt, bei denen mittels eines internen Umschalttaktes die Phasen und/oder Amplituden der hochfrequenten Einzelsignale in Abhängigkeit zuvor ermittelter Phasenlagen und/oder Amplitudenbeiträge geändert werden, um eine bessere Empfangsqualität bei mobilen Systemen zu erreichen.SPARE BLADE 38 14 899, which go back to the same inventor as the present method, furthermore, diversity methods are known in which the phases and / or amplitudes of the high-frequency individual signals are changed by an internal switching clock depending on previously determined phase positions and / or amplitude contributions by one to achieve better reception quality with mobile systems.
Bei sämtlichen derartigen mobilen Empfangsverfahren nach der Diversity-Methode treten also Umschaltvorgänge auf. Diese ver¬ ändern sprunghaft die Amplitude und/oder Phase des empfangenen Signals, so daß dadurch Störsignale und -impulse entstehen, die sehr hohe Werte annehmen können.Switchover processes therefore occur in all such mobile reception methods based on the diversity method. These change abruptly the amplitude and / or phase of the received signal, so that interference signals and impulses arise which can assume very high values.
Bei der Sprach-, Musik- und/oder Videoübertragung mit analogen Signalen führen diese durch die Umschaltvorgänge hervorgeru¬ fenen Störsignale beispielsweise zu Knackgeräuschen, die zwar die Empfangsqualität beeinträchtigen können, jedoch nicht kri¬ tisch sind, da diese gegenüber anderen Störungen, beispiels¬ weise gegenüber Büschelstörungen in der Praxis eine geringere Bedeutung haben. Darüber hinaus reicht die Redundanz des Über¬ tragungsverfahrens in den meisten Fällen aus, die durch die Umschaltvorgänge hervorgerufenen Störsignale zu erkennen und zu beseitigen.In the case of voice, music and / or video transmission with analog signals, these interference signals caused by the switching processes lead, for example, to crackling noises, which may adversely affect the reception quality, but are not critical, since these are, for example, opposite other interference are less important in practice compared to tuft disorders. In addition, the redundancy of the transmission method is sufficient in most cases to identify and eliminate the interference signals caused by the switching processes.
Bei der Übertragung digitaler Signale sind derartige durch die Umschaltvorgänge hervorgerufenen Störsignale oder -impulse auf Grund der sprunghaft sich ändernden Amplitude und/oder Phase wesentlich kritischer. Auf Grund der Einschwingvorgänge können Impulsflanken entstehen, die nicht von den Flanken der digita¬ len Impulse unterschieden werden können. Tritt ein solcher Störimpuls an kritischen Stellen des digitalen Übertragungs¬ signals, beispielsweise beim Auftreten sogenannter höchst sig¬ nifikanter Bits (MSB-most significant bits) oder an sonstigen besonders relevanten Stellen des digitalen Übertragungssignals auf, kann die Übertragung etwa eines ganzen Datenblocks ge¬ stört werden. Als Beispiel für die mobile digitale Datenüber¬ tragung sei beispielsweise das sogenannte Radio-Data-system (RDS) genannt, das der Sendererkennung im UKW-Bereich dient. Weitere Datendienste mit digitaler Datenübertragung sind geplant. Alle diese digitalen Übertragungsverfahren leiden daher in kritischer Weise unter den besagten Störsignalen, wenn Diversity-Verfahren angewandt werden.In the transmission of digital signals, such interference signals or pulses caused by the switching processes are significantly more critical due to the abruptly changing amplitude and / or phase. Due to the transient processes, pulse edges can arise that cannot be distinguished from the edges of the digital pulses. If such an interference pulse occurs at critical points in the digital transmission signal, for example when so-called highly significant bits (MSB-most significant bits) occur or at other particularly relevant points in the digital transmission signal , the transmission of an entire data block can be disturbed. An example of mobile digital data transmission is, for example, the so-called radio data system (RDS), which is used for station identification in the FM range. Further data services with digital data transmission are planned. All of these digital transmission methods therefore suffer critically from the said interference signals when diversity methods are used.
Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren der eingangs genannten Art zu schaffen, das die Nachteile her¬ kömmlicher Verfahren nicht aufweist und insbesondere einen zu¬ verlässigen Empfang von digitalen Signalen mit Diversity-Sy- stemen unterschiedlichster Art ermöglicht.The invention is therefore based on the object of creating a method of the type mentioned at the outset which does not have the disadvantages of conventional methods and in particular enables reliable reception of digital signals with a wide variety of types of diversity systems.
Die gestellte Aufgabe wird dadurch gelöst, daß ein bei der Um¬ schaltung auftretender Störimpuls orthogonal zu den Impulsen des Datensignals liegt.The object is achieved in that an interference pulse occurring during the switching is orthogonal to the pulses of the data signal.
Die erfindungsgemäße Maßnahme, den beim Umschalten auftreten¬ den Störimpuls orthogonal zum Datensignal zu legen, ermöglicht das Ausmitteln in einer AuswerteSchaltung. Dadurch wird ver¬ mieden, daß die auf Grund des Umschaltens auftretenden Stör¬ impulse Störungen der zu empfangenden Datenbits hervorrufen.The measure according to the invention, to place the interference pulse occurring when switching over orthogonal to the data signal, enables averaging in an evaluation circuit. This avoids the fact that the interference pulses occurring due to the switching cause interference in the data bits to be received.
Gemäß einer besonders vorteilhaften Ausgestaltung der Erfin¬ dung wird die Orthogonalität zwischen Störimpuls und Datensig¬ nal durch die Wahl des Zeitpunkts für die Umschaltung zwischen den einzelnen Antennensignalen gebildet.According to a particularly advantageous embodiment of the invention, the orthogonality between the interference pulse and the data signal is formed by the choice of the point in time for the switchover between the individual antenna signals.
Alternativ oder zusätzlich ist es auch möglich, die Orthogona¬ lität zwischen Störimpuls und Datensignal durch Wahl des zeit¬ abhängigen Phasen- und/oder der Amplitudenverlaufs des Em¬ pfangssignals während des Umschaltvorgangs zu erzeugen. Die Phasen- und Amplitudenform des beim Umschaltvorgang ent- stehenden Impulses wird also gemäß dieser Ausführungsform so beeinflußt, daß der Störimpuls orthogonal zu den Impulsen des Datensignals liegt, also im Detektorfilter ausgemittelt wird.Alternatively or additionally, it is also possible to generate the orthogonality between the interference pulse and the data signal by selecting the time-dependent phase and / or the amplitude profile of the reception signal during the switching process. The phase and amplitude shape of the According to this embodiment, the standing pulse is influenced in such a way that the interference pulse is orthogonal to the pulses of the data signal, that is to say is averaged in the detector filter.
Gemäß einer bevorzugten Ausführungsform der Erfindung tritt das Störsignal während eines wenig relevanten Teils des Daten¬ signals auf. Dadurch kann das Auftreten des beim Umschaltvor¬ gang entstehenden Impulses hinsichtlich seiner zeitlichen Lage optimal gewählt werden, derart, daß das Datensignal bzw. das Nutzsignal vom Umschaltsignal möglichst wenig beeinflußt wird. Die zu übertragenden und zu empfangenden digitalen Signale weisen beispielsweise eine bestimmte Wortform, etwa eine 16-Bit-Wortform auf. Diese Wortformen umfassen gering signifi¬ kante und hoch signifikante Bits, auch unter dem Begriff LSB (low significant bit) und MSB (most significant bit) bekannt. Durch geeignete Wahl des Auftretens des Umschaltimpulses im Bereich der gering signifikanten Bits wird erreicht, daß das Datensignal, wenn überhaupt, nur unwesentlich oder unkritisch beeinflußt wird, so daß die hoch signifikanten Bits und damit das Gesamtnutzsignal, wenn überhaupt, nur unwesentlich durch Auftreten von UmschaltSignalen gestört werden bzw wird. Dies ist besonders dann wichtig, wenn der Übertragungsweg im Em¬ pfangsgerät, z. B. das Zwischenfrequenz-filter, keine zu den Impulsen des Datensignals orthogonale Impulsform zuläßt oder diese Pulsform nur unvollkommen erzeugt werden kann.According to a preferred embodiment of the invention, the interference signal occurs during a less relevant part of the data signal. As a result, the occurrence of the pulse occurring during the switchover process can be optimally selected with regard to its temporal position, such that the data signal or the useful signal is influenced as little as possible by the switchover signal. The digital signals to be transmitted and received have, for example, a certain word form, for example a 16-bit word form. These word forms include low-significant and highly significant bits, also known as LSB (low significant bit) and MSB (most significant bit). A suitable choice of the occurrence of the switchover pulse in the region of the insignificant bits ensures that the data signal, if any, is influenced only insignificantly or uncritically, so that the highly significant bits and thus the total useful signal, if any, are only insignificantly affected by the occurrence of switchover signals to be disturbed. This is particularly important if the transmission path in the receiving device, e.g. B. the intermediate frequency filter, no orthogonal to the pulses of the data signal allows pulse shape or this pulse shape can only be generated imperfectly.
Gemäß einer besonders vorteilhaften Ausgestaltung der Erfin¬ dung wird der Umschalt-Zeittakt dem Übertragungstakt des Da¬ tensignals angepaßt. Diese Ausführungsform ist insbesondere bei einem aus der DE-Al 37 37 011 bekannten Diversity-System von Vorteil, wenn der Übertragungstakt des Datensignals höher als der Umschalt-Zeittakt ist. In diesem Falle kann die Synchronisation auf den Blockrahmen erfolgen.According to a particularly advantageous embodiment of the invention, the switchover timing cycle is adapted to the transmission cycle of the data signal. This embodiment is particularly advantageous in a diversity system known from DE-Al 37 37 011 if the transmission clock of the data signal is higher than the switchover clock. In this case, synchronization can take place on the block frame.
Gemäß einer weiteren Ausführungsform der Erfindung liegt der Umschalt-Zeitpunkt außerhalb eines Entscheidungszeiten enthal¬ tenden Zeitfensters. Dies ist insbesondere dann von Vorteil, wenn der Übertragungstakt des Datensignals langsamer als der Umschalt-Zeittakt ist. Bei einem relativ kleinen Übertragungs¬ takt des Datensignals kann ein bestimmtes Zeitfenster so aus¬ gespart werden, daß die Umschaltstörung beispielsweise von den Entscheidungszeiten ferngehalten wird.According to a further embodiment of the invention, the Switching point outside a time window containing decision times. This is particularly advantageous if the transmission clock of the data signal is slower than the changeover clock. In the case of a relatively small transmission clock of the data signal, a certain time window can be left out in such a way that the switchover disturbance is kept away from the decision times, for example.
Bei sogenannten Parallel-Diversity-Systemen, wie sie bei¬ spielsweise aus der DE-Al-37 37 011 bekannt sind, kann der Um¬ schaltimpuls zu beliebigen Zeiten auftreten. Bei derartigen Parallel-Diversity-Systemen ist genügend Zeit vorhanden, um abzuwarten, bis der Schalt-Zeitpunkt mit optimaler Entkopplung von Stör- und Nutzsignal eintritt.In so-called parallel diversity systems, as are known, for example, from DE-Al-37 37 011, the switching pulse can occur at any time. With such parallel diversity systems, there is sufficient time to wait until the switching point occurs with optimal decoupling of the interference and useful signal.
Bei Scanning-Diversity kann eine wesentlich schnellere Um¬ schaltung nötig werden. In diesem Falle ist es dennoch gün¬ stig, bestimmte Zeitfenster mit größter Störwirkung freizu¬ halten.In the case of scanning diversity, a much faster switchover may be necessary. In this case, it is nevertheless expedient to keep certain time windows with the greatest disruptive effect free.
ERSATZBLATT HE BLADE

Claims

Patentansprüche Claims
1. Verfahren zum mobilen Empfang von digitalen Signalen, mit mehreren einzelnen Empfangsantennen, bei dem zwischen ein¬ zelnen Antennensignalen und/oder aus Linearkombinationen von Antennensignalen gebildeten Signalen umgeschaltet wird, dadurch g e k e n n z e i c h n e , daß der bei der Umschaltung auftretender Störimpuls orthogonal zu den Impulsen des Datensignals liegt.1. A method for the mobile reception of digital signals, with several individual receiving antennas, in which a switch is made between individual antenna signals and / or signals formed from linear combinations of antenna signals, characterized in that the interference pulse occurring during the switchover is orthogonal to the pulses of the data signal lies.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Orthogonal!tat zwischen Störimpuls und Datensignal durch die Wahl des Zeitpunkt für die Umschaltung gebildet wird.2. The method according to claim 1, characterized in that the Orthogonal! Tat between glitch and data signal is formed by the choice of the time for the switchover.
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Orthogonalität zwischen Störimpuls und Datensignal durch die Wahl des zeitlichen Verlaufs von Phase und/oder Amplitude des Empfangssignal während des Umschaltvorgangs erzeugt wird.3. The method according to claim 1 or 2, characterized in that the orthogonality between the interference pulse and data signal is generated by the choice of the temporal profile of the phase and / or amplitude of the received signal during the switching process.
4. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das Störsignal auf einen wenig re¬ levanten Teil des Datensignals gelegt wird.4. The method according to any one of the preceding claims, characterized in that the interference signal is placed on a little re¬ relevant part of the data signal.
5. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Umschal-t-Zeittakt mit dem Übertra¬ gungstakt des Datensignals synchronisiert wird.5. The method according to any one of the preceding claims, characterized in that the switch-t timing is synchronized with the transmission clock of the data signal.
6. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Umschalt-Zeitpunkt außerhalb eines Entscheidungszeiten enthaltenden Zeitfensters liegt. 6. The method according to any one of the preceding claims, characterized in that the switchover time lies outside a time window containing decision times.
PCT/EP1990/002290 1990-03-16 1990-12-21 Process for the mobile reception of digital signals WO1991014314A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FI915345A FI915345A0 (en) 1990-03-16 1991-11-13 FOERFARANDE FOER ROERLIG MOTTAGNING AV DIGITALSIGNALER.

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DE19904008502 DE4008502A1 (en) 1990-03-16 1990-03-16 METHOD FOR MOBILE RECEIVING DIGITAL SIGNALS
DEP4008502.3 1990-03-16

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WO1994008404A1 (en) * 1992-09-25 1994-04-14 Northern Telecom Limited Antenna diversity reception in wireless personal communications
US6002672A (en) * 1996-10-25 1999-12-14 Nortel Networks Corporation Diversity antenna selection

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FI915345A0 (en) 1991-11-13
DE4008502C2 (en) 1993-09-16
DE4008502A1 (en) 1991-09-19

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