EP2060036A1 - Device and method for analyzing a measurement signal transmitted via a multichannel system - Google Patents

Device and method for analyzing a measurement signal transmitted via a multichannel system

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Publication number
EP2060036A1
EP2060036A1 EP07785968A EP07785968A EP2060036A1 EP 2060036 A1 EP2060036 A1 EP 2060036A1 EP 07785968 A EP07785968 A EP 07785968A EP 07785968 A EP07785968 A EP 07785968A EP 2060036 A1 EP2060036 A1 EP 2060036A1
Authority
EP
European Patent Office
Prior art keywords
baseband
filter
devices
measurement signal
measuring
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Withdrawn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
EP07785968A
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German (de)
French (fr)
Inventor
Thomas Kuhwald
Markus Freidhof
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.)
Rohde and Schwarz GmbH and Co KG
Original Assignee
Rohde and Schwarz GmbH and Co KG
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 Rohde and Schwarz GmbH and Co KG filed Critical Rohde and Schwarz GmbH and Co KG
Publication of EP2060036A1 publication Critical patent/EP2060036A1/en
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R13/00—Arrangements for displaying electric variables or waveforms
    • G01R13/02—Arrangements for displaying electric variables or waveforms for displaying measured electric variables in digital form
    • G01R13/0218—Circuits therefor
    • G01R13/0254—Circuits therefor for triggering, synchronisation

Definitions

  • the invention relates to a device, in particular a multichannel oscilloscope, and to a method for analyzing a measurement signal transmitted via a multi-channel system.
  • a multi-channel system is used to transmit signals to increase the data rate per bandwidth used and to reduce the bit error rate.
  • a multi-channel system can be used, for example, in a wireless communication system which has a transmitting antenna and a plurality of receiving antennas, a so-called single-input multiple-output (SIMO) system, or multiple transmitting antennas and multiple receiving antennas, a so-called multiple-input multiple-output (MIMO).
  • SIMO single-input multiple-output
  • MIMO multiple-input multiple-output
  • DE 101 14 052 C1 discloses a radio transmission method with multiple transmit and receive antennas operating simultaneously in the same frequency band.
  • Disconnect measurement signal at outputs of the multi-channel system simultaneously and process at the same time.
  • a multichannel system comprising a transmitting antenna and receiving antennas that a measuring signal coupled to the one receiving antenna is processed with a time offset from the measuring signal coupled to the other receiving antenna, ie, for example, fed to a scanning device in chronological succession and offset in time is scanned.
  • a time-delayed processing of the coupled out at a plurality of receiving antennas measurement signal limits the measurement speed and leads to an impairment of the analysis result.
  • the invention is based on the object to provide an apparatus and a method for analyzing a transmitted via a multi-channel system measurement signal, whereby the measurement signal for performing the analysis is processed with very little technical effort and with very high speed.
  • the device which is preferably designed as a multi-channel oscilloscope, comprises a plurality of measuring channels, each having a scanning device, in each case a baseband mixing device and in each case a filter device.
  • the apparatus further comprises an analysis device connected to the filter device for measuring signal analysis, for example modulation analysis.
  • the measuring signal is fed to the measuring channels and the scanning devices arranged in these simultaneously and scanned on these simultaneously on all measuring channels.
  • a sampled measurement signal provided by the samplers is fed to the baseband mixer and synchronously mixed into baseband.
  • the sampled measurement signal is fed to the filter devices for the purpose of decimation of the sampled values and for the analysis device connected downstream of the filter devices.
  • the Device and the method according to the invention is faster to carry out, since the sampled measurement signal is provided at all end of the measuring channels at the same time. Furthermore, a particularly high measuring accuracy can be achieved with the method according to the invention. Furthermore, an existing on the meter, in particular a multi-channel oscilloscope, available bandwidth and recording length is effectively utilized. In addition, no hardware is required in addition to the measuring device, since the outputs of the multi-channel system, in particular designed as a MIMO system, can be coupled directly to the measuring channels of the measuring device. In addition, the cost of a multi-channel measuring device compared to cost for only one measuring channel comprehensive, cascaded measuring devices are particularly low.
  • the number of measuring channels preferably corresponds to the number of outputs of the multi-channel system, in particular the number of receiving antennas formed as outputs on the multi-channel system, to which the measuring signal can be coupled out.
  • the baseband mixer devices For synchronous down-mixing of the sampled measuring signal on the measuring channels, the baseband mixer devices preferably operate in phase.
  • the measuring channels each have a further baseband mixing device and in each case a further filter device.
  • the respective filter device is followed by the respective further baseband mixing device, which is preferably followed by the respective further filter device.
  • the respective first baseband mixing device serves for coarse mixing of the sampled signal
  • the respective further baseband mixing device is designed for fine mixing of the sampled signal.
  • a memory device for recording the sampled signal intended for the analysis is connected downstream of the filter devices provided on the measuring channels.
  • the first and / or the further baseband mixer devices as well as the first and / or the further filter devices are expediently designed to be time-calibratable. This is to the first and / or the other
  • Baseband mixer devices and to the first and / or the further filter devices expediently in each case a time delay element connected, which is preferably driven by a common clock.
  • a common clock generator can preferably be connected to the time delay elements connected to the base band mixer devices and to the filter devices as well as to the other base band mixer devices and to the time delay elements connected to the further filter devices.
  • the real part of the baseband signal and the imaginary part of the baseband signal are obtained from the sampled measurement signal at the baseband mixer devices.
  • the baseband mixer devices preferably each have a digital oscillator which advantageously generates a carrier frequency predetermined for the multichannel system for down-mixing the sampled measurement signal.
  • FIG. 1 is a block diagram of an embodiment of a device for analyzing a transmitted via a MIMO system measurement signal
  • FIG. 2 is a more detailed block diagram of the baseband mixing and filtering in FIG. 1.
  • FIG. 2 Corresponding parts are provided in all figures with the same reference numerals.
  • the multi-channel system 4 is a MIMO system (multiple-input multiple-output system) and comprises four transmitting antennas 6, 8, 10, 12 arranged on a measuring object 5 and four receiving antennas 14, 16, 18, 20, via which an analogue , high frequency measurement signal 22 is transmitted wirelessly from the transmit antennas 6, 8, 10, 12 to the receive antennas 14, 16, 18, 20.
  • MIMO system multiple-input multiple-output system
  • the oscilloscope 2 comprises on the input side four measuring channels 24,26,28,30, the number of which coincides with the number of receiving antennas 14,16,18,20 of the multi-channel system 4. Furthermore, the oscilloscope 2 comprises for each measuring channel 24, 26, 28, 30 in each case a scanning device 32, 34, 36, 38, which supplies the analog, high-frequency measuring signal 22 a made available to the oscilloscope 2 via the measuring channels 24, 26, 28, 30 is supplied to the sampling, wherein the sampling takes place in all measuring channels 24,26,28,30 at the same time.
  • the respective scanner 32,34,36,38 represents the sampled
  • Measuring signal 22b as a digital high-frequency signal of one of the respective scanning device 32,34,36,38 in the measuring channel downstream baseband mixer means 40,42,44,46 available, which is arranged in a in Fig. 2 in detail described function analyzer 47 of the oscilloscope 2.
  • the baseband mixer device 40, 42, 44, 46 mixes the sampled measurement signal 22 b into the baseband and provides the sampled measurement signal 22b as a baseband digital signal in a filter device 48, 50, 52, 54 connected downstream of the baseband mixer device 40, 42, 44, 46.
  • the filter means 48,50,52,54 performs a decimation, ie reduction of the samples of the sampled measurement signal 22b and anti-aliasing filtering for bandwidth reduction, by.
  • the respective filter device 48, 50, 52, 54 decimates the number of samples and, for example, decimates 999 out of 1000 samples with simultaneous anti-aliasing filtering.
  • the measuring signal 22 is fed to a storage device 56 arranged downstream of the filter device 48, 50, 52, 54 and arranged in the function analyzer 47 for storing measurement data comprising the measuring signal 22.
  • the analysis device 58 carries out, for example, a modulation analysis which, for example, the EVM (Error Vector Magnitude) and / or the SNR (Signal Noise Ratio) and / or the modulation depth and / or the I / Q errors, such as I / Q offset or I / Q
  • a modulation analysis which, for example, the EVM (Error Vector Magnitude) and / or the SNR (Signal Noise Ratio) and / or the modulation depth and / or the I / Q errors, such as I / Q offset or I / Q
  • the measurement result is supplied via a signal line 60 to an evaluation and / or display device, not shown in FIG.
  • FIG. 2 shows a more detailed block diagram of a function analyzer 62 for processing a measurement signal 22 transmitted via the MIMO system.
  • the function analyzer 62 according to FIG. 2 differs from the function analyzer 47 according to FIG. 1 in the number of this proposed measuring channels and in the number of provided on this baseband mixer devices and filter devices.
  • the function analyzer 62 has three measuring channels 24, 26, 28 having signal lines 64, 66, 68, over which the measuring signal 22 b sampled in the scanning devices, not shown in FIG. 2, which is indicated by an arrow in FIG respective baseband mixer means 40,42,44 is supplied.
  • the measuring signal 22 is fed via two signal lines 70, 72, 74 and 76, 78, 80 connected to the signal line 64, 66, 68 to two mixers 82, 84, 86 and 88, 90, 82 , To downmix the measuring signal 22 of the
  • Interfrequency level in the baseband is the two mixers or digital multipliers 82,84,86 and 88,90,82 one of a digital oscillator 94,96,98, which in the embodiment as a numerically controlled oscillator (numerically controlled
  • Oscillator NCO generated carrier frequency supplied as a mixing frequency via signal lines 100,102,104 and 106,108,110.
  • the baseband real part and the baseband imaginary part are generated in the first baseband mixer device 40, 42, 44.
  • a sinusoidal oscillation is generated by the oscillator 94,96,98 and fed via the signal line 100,102,104 the mixer 82,8,86 for generating the Meßsignalrealteils.
  • the real part or the imaginary part of the measurement signal 22 in the baseband position are provided on the output side via a signal line 112, 114, 116 or via a signal line 118, 120, 122 to the baseband mixer device 40, 42, 44.
  • the measuring signal 22 is now further processed as a complex baseband signal and supplied via the signal lines 112,114,116 and 180,120,122 of the filter means 48,50,52 and for bandwidth reduction for decimation of the number of samples of the measuring signal 22 in order to avoid aliasing.
  • Each filter device 48, 50, 52 is followed on the output side by a further, second baseband mixer device 124, 126, 128, which in the exemplary embodiment corresponds in structure to the first baseband mixer device 40, 42, 44, but in contrast to the first baseband mixer device 40, 42, 44, which serves for the rough mixing, the fine mixture of the measuring signal 22 is used.
  • the further baseband mixer device 124, 126, 128 is again followed by a further, second filter device 130, 132, 134 for the further decimation of the sampled values and for the further bandwidth reduction of the measurement signal 22 on the output side.
  • the further filter device 130, 132, 134 is connected on the output side via signal lines 136, 138, 140 and 142, 144, 146 to the memory device 56 for recording the measuring signal 22.
  • a signal line 148 connects the memory device 56 to the analyzer 58 shown in FIG.
  • the term calibration with the time delay elements and the clocks has the purpose of compensating the differences in the sound duration in the different measurement channels.
  • the Device according to the invention is used at a sampling rate of, for example, 10 GHz, ie measuring signals of up to 5 GHz are sampled at the intermediate frequency level. At these very high frequencies already cause low geometric differences of
  • the baseband mixing device is used
  • Runtime calibration of the measuring channels 24,26,28 set The time delay elements 150,152,154,156 clock 158,160,162,164 preceded such that in the function analyzer 62 in the example each one Clock 158,160,162,164 is provided for clocking for those time delay elements 150,152,154,156 which are connected to the first baseband mixer means 40,42,44, to the first filter means 48,50,52, to the other baseband mixer means 124,126,128, or to the further filter means 130,132,134. Accordingly, corresponding mixers or digital multipliers 201, 202, 203, 205, 208, 208 and corresponding digital oscillators 204, 206, 208 are present in the second baseband mixer devices 124, 126, 128.
  • the invention is not limited to the exemplary embodiments illustrated in the drawing, in particular not to an oscilloscope comprising three or four measuring channels.
  • an oscilloscope comprising three or four measuring channels.
  • only a single clock generator may be present. This is also advantageous because the individual clock generators then do not have to be synchronized with each other. All features described above and shown in the drawing can be combined with each other.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)

Abstract

A device, especially a multichannel oscilloscope (2), for analyzing at least one measurement signal (22), transmitted via a multichannel system (4), and having a plurality of measurement channels (24, 26, 28, 30), comprises respective sampling devices (32, 34, 36, 38), respective baseband mixing devices (40, 42, 44, 46), respective filter devices (48, 50, 52, 54) and an analytical device (58). The measurement signal (22) is supplied to the measurement channels (24, 26, 28, 30) and to the respective sampling devices (32, 34, 36, 38) for simultaneous sampling. The sampled measurement signal (22b) is supplied to the baseband mixing devices (40, 42, 44, 46) mounted downstream of the sampling devices (32, 34, 36, 38) for downmixing the measurement signal (22) to the baseband, to the filter devices (48, 50, 52, 54) mounted downstream of the baseband mixing devices (40, 42, 44, 46) for decimating the sampled values of the measurement signal (22) in the baseband and to the analytical device (58) connected to the filter devices (48, 50, 52, 54) for analysis of the measurement signal (22).

Description

Vorrichtung und Verfahren zur Analyse eines über ein MehrkanalSystem übertragenen Messsignals Device and method for analyzing a measurement signal transmitted via a multichannel system
Die Erfindung bezieht sich auf eine Vorrichtung, insbesondere ein Mehrkanal-Oszilloskop, und auf ein Verfahren zur Analyse eines über ein Mehrkanalsystem übertragenen Messsignals.The invention relates to a device, in particular a multichannel oscilloscope, and to a method for analyzing a measurement signal transmitted via a multi-channel system.
In der Nachrichtentechnik wird ein Mehrkanalsystem zur Übertragung von Signalen eingesetzt, um die Datenrate pro genutzter Bandbreite zu erhöhen und die Bitfehlerrate zu reduzieren. Ein Mehrkanalsystem ist beispielsweise in einem drahtlosen Kommunikationssystem einsetzbar, welches über eine Sendeantenne und mehrere Empfangsantennen, ein sogenanntes Single-Input Multiple-Output (SIMO) System, oder über mehrere Sendeantennen und mehrere Empfangsantennen, ein sogenanntes Multiple-Input Multiple- Output (MIMO) System, verfügt. In der DE 101 14 052 Cl ist ein Funkübertragungsverfahren mit multiplen, gleichzeitig im selben Frequenzband arbeitenden Sende- und Empfangsantennen offenbart.In telecommunications, a multi-channel system is used to transmit signals to increase the data rate per bandwidth used and to reduce the bit error rate. A multi-channel system can be used, for example, in a wireless communication system which has a transmitting antenna and a plurality of receiving antennas, a so-called single-input multiple-output (SIMO) system, or multiple transmitting antennas and multiple receiving antennas, a so-called multiple-input multiple-output (MIMO). System, features. DE 101 14 052 C1 discloses a radio transmission method with multiple transmit and receive antennas operating simultaneously in the same frequency band.
Als Voraussetzung für eine besonders hochwertige und genaue Analyse und/oder Aufzeichnung des über das Mehrkanalsystem übertragenen Messsignals ist dasAs a prerequisite for a particularly high-quality and accurate analysis and / or recording of the transmitted over the multi-channel system measuring signal is
Messsignal an Ausgängen des Mehrkanalsystems gleichzeitig auszukoppeln und gleichzeitig zu verarbeiten. Dabei ist es an einem Sendeantennen und Empfangsantennen umfassenden Mehrkanalsystem bisher meistens der Fall, dass ein an der einen Empfangsantenne ausgekoppeltes Messsignal zeitversetzt zu dem an der anderen Empfangsantenne ausgekoppelten Messsignal verarbeitet wird, also beispielsweise zeitlich aufeinander folgend einer Abtasteinrichtung zugeführt und zeitversetzt zueinander abgetastet wird. Eine zeitversetzte Verarbeitung des an mehreren Empfangsantennen ausgekoppelten Messsignals schränkt die Messgeschwindigkeit ein und führt zu einer Beeinträchtigung des Analyseergebnisses.Disconnect measurement signal at outputs of the multi-channel system simultaneously and process at the same time. Hitherto, it has mostly been the case on a multichannel system comprising a transmitting antenna and receiving antennas that a measuring signal coupled to the one receiving antenna is processed with a time offset from the measuring signal coupled to the other receiving antenna, ie, for example, fed to a scanning device in chronological succession and offset in time is scanned. A time-delayed processing of the coupled out at a plurality of receiving antennas measurement signal limits the measurement speed and leads to an impairment of the analysis result.
Der Erfindung liegt die Aufgabe zu Grunde, eine Vorrichtung und ein Verfahren zur Analyse eines über ein Mehrkanalsystem übertragenen Messsignals anzugeben, womit das Messsignal zur Durchführung der Analyse mit besonders geringem technischen Aufwand und mit besonders hoher Geschwindigkeit aufbereitet wird.The invention is based on the object to provide an apparatus and a method for analyzing a transmitted via a multi-channel system measurement signal, whereby the measurement signal for performing the analysis is processed with very little technical effort and with very high speed.
Bezüglich der Vorrichtung wird die genannte Aufgabe erfindungsgemäß gelöst durch die Merkmale des Anspruchs 1. Vorteilhafte Weiterbildungen sind Gegenstand der hierauf rückbezogenen Unteransprüche.With regard to the device, the object is achieved according to the invention by the features of claim 1. Advantageous developments are the subject of the dependent claims.
Bezüglich des Verfahrens wird die genannte Aufgabe erfindungsgemäß gelöst durch die Merkmale des Anspruchs 11. Vorteilhafte Weiterbildungen sind Gegenstand der hierauf rückbezogenen Unteransprüche.With regard to the method, the object is achieved according to the invention by the features of claim 11. Advantageous developments are the subject of the dependent claims.
So umfasst die Vorrichtung, welche bevorzugt als Mehrkanal-Oszilloskop ausgeführt ist, mehrere Messkanäle, welche jeweils eine Abtasteinrichtung, jeweils eine Basisbandmischereinrichtung und jeweils eine Filtereinrichtung aufweisen. Dabei sind die jeweilige Filtereinrichtung der jeweiligen Basisbandmischereinrichtung und diese der jeweiligen Abtasteinrichtung nachgeschaltet. Die Vorrichtung umfasst weiter eine mit der Filtereinrichtung verbundene Analyseeinrichtung zur Messsignalanalyse, beispielsweise Modulationsanalyse . Beim erfindungsgemäßen Verfahren wird das Messsignal den Messkanälen und den in diesen angeordneten Abtasteinrichtungen gleichzeitig zugeführt und an diesen auf allen Messkanälen gleichzeitig abgetastet. Ein von den Abtasteinrichtungen zur Verfügung gestelltes, abgetastetes Messsignal wird den Basisbandmischereinrichtungen zugeführt und synchron in ein Basisband herabgemischt. Das abgetastete Messsignal wird zur Dezimierung der Abtastwerte den Filtereinrichtungen und zur Analyse der den Filtereinrichtungen nachgeschalteten Analyseeinrichtung zugeführt.Thus, the device, which is preferably designed as a multi-channel oscilloscope, comprises a plurality of measuring channels, each having a scanning device, in each case a baseband mixing device and in each case a filter device. In this case, the respective filter device of the respective baseband mixer device and this downstream of the respective scanning device. The apparatus further comprises an analysis device connected to the filter device for measuring signal analysis, for example modulation analysis. In the method according to the invention, the measuring signal is fed to the measuring channels and the scanning devices arranged in these simultaneously and scanned on these simultaneously on all measuring channels. A sampled measurement signal provided by the samplers is fed to the baseband mixer and synchronously mixed into baseband. The sampled measurement signal is fed to the filter devices for the purpose of decimation of the sampled values and for the analysis device connected downstream of the filter devices.
Die mit der Erfindung erzielten Vorteile bestehen insbesondere darin, dass die Messsignal- und/oder Modulationsanalyse mittels der erfindungsgemäßenThe advantages achieved by the invention are in particular that the measurement signal and / or modulation analysis by means of the inventive
Vorrichtung und des erfindungsgemäßen Verfahrens schneller durchführbar ist, da das abgetastete Messsignal an allen Messkanälen endseitig zur gleichen Zeit zur Verfügung gestellt wird. Des Weiteren ist mit dem erfindungsgemäßen Verfahren eine besonders hohe Messgenauigkeit erzielbar. Ferner wird eine am Messgerät, insbesondere einem Mehrkanal-Oszilloskop, vorhandene Bandbreite und Aufzeichnungslänge wirkungsvoll ausgenutzt. Zudem ist zusätzlich zum Messgerät keine Hardware erforderlich, da die Ausgänge des insbesondere als MIMO-System ausgeführten Mehrkanalsystems direkt mit den Messkanälen des Messgeräts koppelbar sind. Darüber hinaus sind die Anschaffungskosten für ein mehrere Messkanäle umfassendes Messgerät im Vergleich zu Anschaffungskosten für lediglich jeweils einen Messkanal umfassende, kaskadierte Messgeräte besonders gering.Device and the method according to the invention is faster to carry out, since the sampled measurement signal is provided at all end of the measuring channels at the same time. Furthermore, a particularly high measuring accuracy can be achieved with the method according to the invention. Furthermore, an existing on the meter, in particular a multi-channel oscilloscope, available bandwidth and recording length is effectively utilized. In addition, no hardware is required in addition to the measuring device, since the outputs of the multi-channel system, in particular designed as a MIMO system, can be coupled directly to the measuring channels of the measuring device. In addition, the cost of a multi-channel measuring device compared to cost for only one measuring channel comprehensive, cascaded measuring devices are particularly low.
Die Anzahl des Messkanäle entspricht vorzugsweise der Anzahl von Ausgängen des Mehrkanalsystems, insbesondere der Anzahl der an dem Mehrkanalsystem als Ausgänge ausgebildeten Empfangsantennen, woran das Messsignal auskoppelbar ist.The number of measuring channels preferably corresponds to the number of outputs of the multi-channel system, in particular the number of receiving antennas formed as outputs on the multi-channel system, to which the measuring signal can be coupled out.
Zur synchronen Herabmischung des abgetasteten Messsignals auf den Messkanälen arbeiten die Basisbandmischereinrichtungen vorzugsweise phasengleich.For synchronous down-mixing of the sampled measuring signal on the measuring channels, the baseband mixer devices preferably operate in phase.
Gemäß vorteilhafter Ausgestaltung weisen die Messkanäle jeweils eine weitere Basisbandmischereinrichtung und jeweils eine weitere Filtereinrichtung auf. Der jeweiligen Filtereinrichtung ist die jeweilige weitere Basisbandmischereinrichtung nachgeschaltet, welcher vorzugsweise die jeweilige weitere Filtereinrichtung nachgeschaltet ist. In zweckmäßiger Weiterbildung dient die jeweilige erste Basisbandmischereinrichtung zur Grobmischung des abgetasteten Signals, wohingegen die jeweilige weitere Basisbandmischereinrichtung zur Feinmischung des abgetasteten Signals ausgebildet ist.According to an advantageous embodiment, the measuring channels each have a further baseband mixing device and in each case a further filter device. The respective filter device is followed by the respective further baseband mixing device, which is preferably followed by the respective further filter device. In an expedient development, the respective first baseband mixing device serves for coarse mixing of the sampled signal, whereas the respective further baseband mixing device is designed for fine mixing of the sampled signal.
Gemäß vorteilhafter Weiterbildung ist den auf den Messkanälen vorgesehenen Filtereinrichtungen eine Speichereinrichtung zur Aufzeichnung des abgetasteten, für die Analyse bestimmten Signals nachgeschaltet.According to an advantageous development, a memory device for recording the sampled signal intended for the analysis is connected downstream of the filter devices provided on the measuring channels.
Um eine ausreichende Kohärenz der Messkanäle zu erreichen und eine gemeinsame Phasenbeziehung zwischen den Messkanälen herzustellen, sind die ersten und/oder die weiteren Basisbandmischereinrichtungen sowie die ersten und/oder die weiteren Filtereinrichtungen zweckmäßigerweise laufzeitkalibrierbar ausgebildet. Dazu ist an die ersten und/oder die weiterenIn order to achieve sufficient coherence of the measuring channels and to establish a common phase relationship between the measuring channels, the first and / or the further baseband mixer devices as well as the first and / or the further filter devices are expediently designed to be time-calibratable. This is to the first and / or the other
Basisbandmischereinrichtungen sowie an die ersten und/oder die weiteren Filtereinrichtungen zweckmäßigerweise jeweils ein Zeitverzögerungsglied angeschlossen, welches vorzugsweise von einem gemeinsamen Taktgeber angesteuert wird.Baseband mixer devices and to the first and / or the further filter devices expediently in each case a time delay element connected, which is preferably driven by a common clock.
Dabei kann an den mit den Basisbandmischereinrichtungen und an den mit den Filtereinrichtungen sowie an den mit den weiteren Basisbandmischereinrichtungen und an den mit den weiteren Filtereinrichtungen verbundenen Zeitverzögerungsgliedern vorzugsweise jeweils ein gemeinsamer Taktgeber angeschlossen sein.In this case, a common clock generator can preferably be connected to the time delay elements connected to the base band mixer devices and to the filter devices as well as to the other base band mixer devices and to the time delay elements connected to the further filter devices.
In zweckmäßiger Weiterbildung werden an den Basisbandmischereinrichtungen aus dem abgetastetem Messsignal der Realteil des Basisbandsignals und der Imaginärteil des Basisbandsignals gewonnen.In an expedient development, the real part of the baseband signal and the imaginary part of the baseband signal are obtained from the sampled measurement signal at the baseband mixer devices.
Um das abgetastete Messsignal in das Basisband herabzumischen, weisen die Basisbandmischereinrichtungen vorzugsweise jeweils einen eine zweckmäßigerweise für das Mehrkanalsystem vorgegebene Trägerfrequenz erzeugenden digitalen Oszillator zur Herabmischung des abgetasteten Messsignals auf.In order to mix down the sampled measurement signal into the baseband, the baseband mixer devices preferably each have a digital oscillator which advantageously generates a carrier frequency predetermined for the multichannel system for down-mixing the sampled measurement signal.
Nachfolgend wird ein Ausfϋhrungsbeispiel der Erfindung anhand einer Zeichnung beispielhaft näher erläutert. Darin zeigenAn exemplary embodiment of the invention will be explained in greater detail below by way of example with reference to a drawing. Show in it
Fig. 1 ein Prinzipschaltbild eines Ausführungsbeispiels einer Vorrichtung zur Analyse eines über ein MIMO-System übertragenen Messsignals und1 is a block diagram of an embodiment of a device for analyzing a transmitted via a MIMO system measurement signal and
Fig. 2 ein detaillierteres Prinzipschaltbild der Basisbandmischung und Filterung in Fig. 1. Einander entsprechende Teile sind in allen Figuren mit den gleichen Bezugszeichen versehen.FIG. 2 is a more detailed block diagram of the baseband mixing and filtering in FIG. 1. FIG. Corresponding parts are provided in all figures with the same reference numerals.
Fig. 1 zeigt ein Prinzipschaltbild einer als Oszilloskop 2 ausgeführten Vorrichtung, welches an ein Mehrkanalsystem 4 angeschlossen ist. Das Mehrkanalsystem 4 ist im Ausführungsbeispiel ein MIMO-System (Multiple-Input Multiple-Output System) und umfasst beispielhaft vier an einem Messobjekt 5 angeordnete Sendeantennen 6,8,10,12 und vier Empfangsantennen 14,16,18,20, worüber ein analoges, hochfrequentes Messsignal 22 drahtlos von den Sendeantennen 6,8,10,12 zu den Empfangsantennen 14,16,18,20 übertragen wird.1 shows a block diagram of a device designed as an oscilloscope 2, which is connected to a multi-channel system 4. In the exemplary embodiment, the multi-channel system 4 is a MIMO system (multiple-input multiple-output system) and comprises four transmitting antennas 6, 8, 10, 12 arranged on a measuring object 5 and four receiving antennas 14, 16, 18, 20, via which an analogue , high frequency measurement signal 22 is transmitted wirelessly from the transmit antennas 6, 8, 10, 12 to the receive antennas 14, 16, 18, 20.
Das Oszilloskop 2 umfasst eingangsseitig vier Messkanäle 24,26,28,30, deren Anzahl mit der Anzahl der Empfangsantennen 14,16,18,20 des Mehrkanalsystems 4 übereinstimmt. Des Weiteren umfasst das Oszilloskops 2 für jeden Messkanal 24,26,28,30 jeweils eine Abtasteinrichtung 32,34,36,38, welcher das über die Messkanäle 24,26,28,30 dem Oszilloskops 2 zur Verfügung gestellte analoge, hochfrequente Messsignal 22a zur Abtastung zugeführt wird, wobei die Abtastung in allen Messkanälen 24,26,28,30 zur gleichen Zeit statt findet. Die jeweilige Abtasteinrichtung 32,34,36,38 stellt das abgetasteteThe oscilloscope 2 comprises on the input side four measuring channels 24,26,28,30, the number of which coincides with the number of receiving antennas 14,16,18,20 of the multi-channel system 4. Furthermore, the oscilloscope 2 comprises for each measuring channel 24, 26, 28, 30 in each case a scanning device 32, 34, 36, 38, which supplies the analog, high-frequency measuring signal 22 a made available to the oscilloscope 2 via the measuring channels 24, 26, 28, 30 is supplied to the sampling, wherein the sampling takes place in all measuring channels 24,26,28,30 at the same time. The respective scanner 32,34,36,38 represents the sampled
Messsignal 22b als ein digitales Hochfrequenzsignal einer der jeweiligen Abtasteinrichtung 32,34,36,38 im Messkanal nachgeschalteten Basisbandmischereinrichtung 40,42,44,46 zur Verfügung, welche in einem in Fig. 2 im Detail beschriebenen Funktionsanalysator 47 des Oszilloskops 2 angeordnet ist.Measuring signal 22b as a digital high-frequency signal of one of the respective scanning device 32,34,36,38 in the measuring channel downstream baseband mixer means 40,42,44,46 available, which is arranged in a in Fig. 2 in detail described function analyzer 47 of the oscilloscope 2.
Die Basisbandmischereinrichtung 40,42,44,46 mischt das abgetastete Messsignal 22b in das Basisband herab und stellt das abgetastete Messsignal 22b als digitales Signal in Basisbandlage einer der Basisbandmischereinrichtung 40,42,44,46 nachgeschalteten Filtereinrichtung 48,50,52,54 zur Verfügung. Die Filtereinrichtung 48,50,52,54 führt eine Dezimation, d. h. Reduzierung der Abtastwerte des abgetasteten Messsignals 22b und eine Anti-Aliasing- Filterung zur Bandbreitenreduzierung, durch. Bei einer vergleichsweise hohen Abtastrate von beispielsweise 10GHz dezimiert die jeweilige Filtereinrichtung 48,50,52,54 die Anzahl der Abtastwerte und dezimiert beispielsweise 999 von 1000 Abtastwerten bei gleichzeitiger Anti-Aliasing- Filterung. Danach wird das Messsignal 22 einer der Filtereinrichtung 48,50,52,54 nachgeschalteten, im Funktionsanalysator 47 angeordneten Speichereinrichtung 56 zur Speicherung von das Messsignal 22 umfassenden Messdaten zugeführt.The baseband mixer device 40, 42, 44, 46 mixes the sampled measurement signal 22 b into the baseband and provides the sampled measurement signal 22b as a baseband digital signal in a filter device 48, 50, 52, 54 connected downstream of the baseband mixer device 40, 42, 44, 46. The filter means 48,50,52,54 performs a decimation, ie reduction of the samples of the sampled measurement signal 22b and anti-aliasing filtering for bandwidth reduction, by. At a comparatively high sampling rate of, for example, 10 GHz, the respective filter device 48, 50, 52, 54 decimates the number of samples and, for example, decimates 999 out of 1000 samples with simultaneous anti-aliasing filtering. Thereafter, the measuring signal 22 is fed to a storage device 56 arranged downstream of the filter device 48, 50, 52, 54 and arranged in the function analyzer 47 for storing measurement data comprising the measuring signal 22.
Zur Analyse wird das digitale Mehrkanal-Messsignal der Speichereinrichtung 56 wieder entnommen und einer im Oszilloskop 2 z. B. softwareimplementiertenFor analysis, the digital multi-channel measurement signal of the memory device 56 is removed again and one in the oscilloscope 2 z. B. software implemented
Analyseeinrichtung 58 zugeführt. Die Analyseeinrichtung 58 führt beispielsweise eine Modulationsanalyse durch, welche beispielsweise die EVM (Error Vector Magnitude) und/oder das SNR (Signal Noise Ratio) und/oder die Modulationstiefe und/oder die I/Q-Fehler, wie I/Q-Offset oder I/Q-Analyzer 58 supplied. The analysis device 58 carries out, for example, a modulation analysis which, for example, the EVM (Error Vector Magnitude) and / or the SNR (Signal Noise Ratio) and / or the modulation depth and / or the I / Q errors, such as I / Q offset or I / Q
Imbalance, untersucht. Das Messergebnis wird über eine Signalleitung 60 einer in Fig. 1 nicht gezeigten Auswerte- und/oder Anzeigeeinrichtung zugeführt.Imbalance, studied. The measurement result is supplied via a signal line 60 to an evaluation and / or display device, not shown in FIG.
Fig. 2 zeigt ein detaillierteres Prinzipschaltbild eines Funktionsanalysators 62 zur Verarbeitung eines über das MIMO-System übertragenen Messsignals 22. Der Funktionsanalysator 62 gemäß Fig. 2 unterscheidet sich vom Funktionsanalysators 47 gemäß Fig. 1 in der Anzahl der an diesem vorgesehenen Messkanäle sowie in der Anzahl der an diesem vorgesehenen Basisbandmischereinrichtungen und Filtereinrichtungen.2 shows a more detailed block diagram of a function analyzer 62 for processing a measurement signal 22 transmitted via the MIMO system. The function analyzer 62 according to FIG. 2 differs from the function analyzer 47 according to FIG. 1 in the number of this proposed measuring channels and in the number of provided on this baseband mixer devices and filter devices.
Der Funktionsanalysator 62 weist im dargestellten Beispiel drei Messkanäle 24,26,28 mit Signalleitungen 64,66,68 auf, worüber das in den in Fig. 2 nicht gezeigten Abtasteinrichtungen abgetastete Messsignal 22b, welches in Fig. 2 mit einem Pfeil gekennzeichnet ist, der jeweiligen Basisbandmischereinrichtung 40,42,44 zugeführt wird. In der Basisbandmischereinrichtung 40,42,44 wird das Messsignal 22 über zwei mit der Signalleitung 64,66,68 verbundene Signalleitungen 70,72,74 und 76,78,80 jeweils zwei Mischern 82,84,86 und 88,90,82 zugeführt. Zur Herabmischung des Messsignals 22 von derIn the example shown, the function analyzer 62 has three measuring channels 24, 26, 28 having signal lines 64, 66, 68, over which the measuring signal 22 b sampled in the scanning devices, not shown in FIG. 2, which is indicated by an arrow in FIG respective baseband mixer means 40,42,44 is supplied. In the baseband mixer device 40, 42, 44, the measuring signal 22 is fed via two signal lines 70, 72, 74 and 76, 78, 80 connected to the signal line 64, 66, 68 to two mixers 82, 84, 86 and 88, 90, 82 , To downmix the measuring signal 22 of the
Zwischenfrequenzebene in das Basisband wird den jeweils zwei Mischern bzw. digitalen Multiplikatoren 82,84,86 und 88,90,82 eine von einem digitalen Oszillator 94,96,98, welcher im Ausführungsbeispiel als numerisch kontrollierter Oszillator (numerically controlledInterfrequency level in the baseband is the two mixers or digital multipliers 82,84,86 and 88,90,82 one of a digital oscillator 94,96,98, which in the embodiment as a numerically controlled oscillator (numerically controlled
Oszillator NCO) ausgeführt ist, erzeugte Trägerfrequenz als Mischfrequenz über Signalleitungen 100,102,104 und 106,108,110 zugeführt.Oscillator NCO), generated carrier frequency supplied as a mixing frequency via signal lines 100,102,104 and 106,108,110.
Dabei wird in der ersten Basisbandmischereinrichtung 40,42,44 der Basisband-Realteil und der Basisband- Imaginärteil erzeugt. Dazu wird vom Oszillator 94,96,98 eine Sinusschwingung erzeugt und über die Signalleitung 100,102,104 dem Mischer 82,8,86 zur Erzeugung des Messsignalrealteils zugeführt. Zur Erzeugung desIn this case, the baseband real part and the baseband imaginary part are generated in the first baseband mixer device 40, 42, 44. For this purpose, a sinusoidal oscillation is generated by the oscillator 94,96,98 and fed via the signal line 100,102,104 the mixer 82,8,86 for generating the Meßsignalrealteils. To generate the
Messsignalimaginärteils gibt der Oszillator 94,96,98 über die Signalleitung 106,108,110 eine zur Sinusschwingung für den Mischer 82,84,86 90°-phasenverschobene Cosinusschwingung an den Mischer 88,90,92 ab. Der Realteil bzw. der Imaginärteil des Messsignals 22 in Basisbandlage werden über eine Signalleitung 112,114,116 bzw. über eine Signalleitung 118,120,122 an der Basisbandmischereinrichtung 40,42,44 ausgangsseitig zur Verfügung gestellt. Das Messsignal 22 wird nunmehr als komplexes Basisband-Signal weiterverarbeitet und über die Signalleitungen 112,114,116 und 180,120,122 der Filtereinrichtung 48,50,52 und zur Bandbreitenreduzierung zur Dezimierung der Anzahl der Abtastwerte des Messsignals 22 zwecks Vermeidung von Aliasing zugeführt.Signalimaginärteils the oscillator 94,96,98 via the signal line 106,108,110 from a sine wave for the mixer 82,84,86 90 ° phase-shifted cosine oscillation to the mixer 88,90,92 from. The real part or the imaginary part of the measurement signal 22 in the baseband position are provided on the output side via a signal line 112, 114, 116 or via a signal line 118, 120, 122 to the baseband mixer device 40, 42, 44. The measuring signal 22 is now further processed as a complex baseband signal and supplied via the signal lines 112,114,116 and 180,120,122 of the filter means 48,50,52 and for bandwidth reduction for decimation of the number of samples of the measuring signal 22 in order to avoid aliasing.
Jeder Filtereinrichtung 48,50,52 ist ausgangsseitig eine weitere, zweite Basisbandmischereinrichtung 124,126,128 nachgeschaltet, welche im Ausführungsbeispiel vom Aufbau mit der ersten Basisbandmischereinrichtung 40,42,44 übereinstimmt, aber im Gegensatz zur ersten Basisbandmischereinrichtung 40,42,44, die der Grobmischung dient, der Feinmischung des Messsignals 22 dient. Der weiteren Basisbandmischereinrichtung 124,126,128 ist ausgangsseitig wiederum eine weitere, zweite Filtereinrichtung 130,132,134 zur weiteren Dezimation der Abtastwerte und zur weiteren Bandbreitenreduzierung des Messsignals 22 nachgeschaltet. Die weitere Filtereinrichtung 130,132,134 ist ausgangsseitig über Signalleitungen 136,138,140 und 142,144,146 mit der Speichereinrichtung 56 zur Aufzeichnung des Messsignals 22 verbunden. Eine Signalleitung 148 verbindet die Speichereinrichtung 56 mit der in Fig. 1 gezeigten Analyseeinrichtung 58.Each filter device 48, 50, 52 is followed on the output side by a further, second baseband mixer device 124, 126, 128, which in the exemplary embodiment corresponds in structure to the first baseband mixer device 40, 42, 44, but in contrast to the first baseband mixer device 40, 42, 44, which serves for the rough mixing, the fine mixture of the measuring signal 22 is used. The further baseband mixer device 124, 126, 128 is again followed by a further, second filter device 130, 132, 134 for the further decimation of the sampled values and for the further bandwidth reduction of the measurement signal 22 on the output side. The further filter device 130, 132, 134 is connected on the output side via signal lines 136, 138, 140 and 142, 144, 146 to the memory device 56 for recording the measuring signal 22. A signal line 148 connects the memory device 56 to the analyzer 58 shown in FIG.
Die Laufzeitkalibrierung mit den Zeitverzögerungsgliedern und den Taktgebern hat den Sinn, die Lautzeitunterschiede in den unterschiedlichen Messkanälen auszugleichen. Die erfindungsgemäße Vorrichtung wird bei einer Abtastrate von beispielsweise 10 GHz eingesetzt, d. h. es werden auf der Zwischenfrequenzebene Messsignale mit bis zu 5 GHz abgetastet. Bei diesen sehr hohen Frequenzen bedingen bereits geringe geometrische Unterschiede derThe term calibration with the time delay elements and the clocks has the purpose of compensating the differences in the sound duration in the different measurement channels. The Device according to the invention is used at a sampling rate of, for example, 10 GHz, ie measuring signals of up to 5 GHz are sampled at the intermediate frequency level. At these very high frequencies already cause low geometric differences of
Signalleitungen in den einzelnen Messkanälen relativ große Phasenunterschiede. Es ist daher davon auszugehen, dass die Abtastung in den einzelnen Abtasteinrichtungen (Analog/Digital-Wandlern) 32 bis 38 in den einzelnen Messkanälen nicht in der exakt gleichen Phasenlage des Messsignals erfolgt. Dies muss bei der nachfolgenden digitalen Verarbeitung ausgeglichen werden, indem die Phasenlage der digitalen Oszillatoren 94,96,98 bzw. 204,206 und 208 bezüglich der Phaselage der von diesem generierten digitalen Sinus- bzw. Cosinussignale entsprechend justiert wird. Entsprechend muss der die Filter 48,50,52 bzw. 130,132,134 steuernde Takt entsprechend vorgehalten bzw. nachgehalten werden, so dass der Zeitpunkt der dortigen Verarbeitung der in diesem Messkanal entsprechend vorlaufenden bzw. nachlaufenden Abtastung exakt entspricht.Signal lines in the individual measuring channels relatively large phase differences. It is therefore to be assumed that the sampling in the individual scanning devices (analog / digital converters) 32 to 38 in the individual measuring channels does not take place in the exact same phase position of the measuring signal. This must be compensated in the subsequent digital processing by the phase position of the digital oscillators 94,96,98 and 204,206 and 208 is adjusted according to the phase position of the digital sine or cosine signals generated by this. Correspondingly, the clock controlling the filters 48, 50, 52 or 130, 132, 134 must be kept or tracked accordingly, so that the time of the local processing corresponds exactly to the sampling corresponding to leading or trailing scanning in this measuring channel.
Um das in den Abtasteinrichtungen gleichzeitig abgetastete Messsignal 22 auf den Messkanälen 24,26,28 kohärent zu verarbeiten, werden die BasisbandmischereinrichtungTo coherently process the measurement signal 22 simultaneously sampled in the sampling devices on the measurement channels 24, 26, 28, the baseband mixing device is used
40,42,44, die Filtereinrichtung 48,50,52 sowie die weitere Basisbandmischereinrichtung 124,126,128 und die weitere Filtereinrichtung 130,132,134 im schematisch dargestellten Ausführungsbeispiel von jeweils einem Zeitverzögerungsglied 150,152,154,156 zur40,42,44, the filter means 48,50,52 and the further baseband mixer means 124,126,128 and the further filter means 130,132,134 in the schematically illustrated embodiment of a respective time delay element 150,152,154,156
Laufzeitenkalibrierung der Messkanäle 24,26,28 eingestellt. Den Zeitverzögerungsgliedern 150,152,154,156 sind Taktgeber 158,160,162,164 derart vorgeschaltet, dass im Funktionsanalysator 62 im Beispiel jeweils ein Taktgeber 158,160,162,164 zur Taktvorgabe für diejenigen Zeitverzögerungsglieder 150,152,154,156 vorgesehen ist, welche an den ersten Basisbandmischereinrichtungen 40,42,44, an den ersten Filtereinrichtungen 48,50,52, an den weiteren Basisbandmischereinrichtungen 124,126,128, oder an den weiteren Filtereinrichtungen 130,132,134 angeschlossen sind. Entsprechend sind bei den zweiten Basisbandmischereinrichtungen 124,126,128 entsprechende Mischer bzw. digitale Multiplikatoren 201,202,203,205,207,208 und entsprechende digitale Oszillatoren 204,206,208 vorhanden.Runtime calibration of the measuring channels 24,26,28 set. The time delay elements 150,152,154,156 clock 158,160,162,164 preceded such that in the function analyzer 62 in the example each one Clock 158,160,162,164 is provided for clocking for those time delay elements 150,152,154,156 which are connected to the first baseband mixer means 40,42,44, to the first filter means 48,50,52, to the other baseband mixer means 124,126,128, or to the further filter means 130,132,134. Accordingly, corresponding mixers or digital multipliers 201, 202, 203, 205, 208, 208 and corresponding digital oscillators 204, 206, 208 are present in the second baseband mixer devices 124, 126, 128.
Die Erfindung ist nicht auf die in der Zeichnung dargestellten Ausführungsbeispiele, insbesondere nicht auf ein drei oder vier Messkanäle umfassendes Oszilloskop, beschränkt. Natürlich kann alternativ auch nur ein einziger Taktgenerator vorhanden sein. Dies ist auch vorteilhaft, weil die einzelnen Taktgeneratoren dann nicht aufeinander synchronisiert werden müssen. Alle vorstehend beschriebenen und in der Zeichnung dargestellten Merkmale sind beliebig miteinander kombinierbar. The invention is not limited to the exemplary embodiments illustrated in the drawing, in particular not to an oscilloscope comprising three or four measuring channels. Of course, alternatively, only a single clock generator may be present. This is also advantageous because the individual clock generators then do not have to be synchronized with each other. All features described above and shown in the drawing can be combined with each other.

Claims

Ansprüche claims
1. Vorrichtung, insbesondere ein Mehrkanal-Oszilloskop (2), zur Analyse eines über ein Mehrkanalsystem (4) übertragenen Messsignals (22), mit mehreren Messkanälen (24,26,28,30) umfassend jeweils eine Abtasteinrichtung (32,34,36,38), jeweils eine erste Basisbandmischereinrichtung (40,42,44,46), jeweils eine erste Filtereinrichtung (48,50,52,54), der mit einer Analyseeinrichtung (58), wobei das Messsignal (22) den jeweiligen Abtasteinrichtungen (32,34,36,38) der Messkanäle (24,26,28,30) zur gleichzeitigen Abtastung zugeführt ist, und wobei das abgetastete Messsignal (22b) den den Abtasteinrichtungen (32,34,36,38) nachgeschalteten ersten Basisbandmischereinrichtungen (40,42,44,46) zur Herabmischung des Messsignals (22) in ein Basisband, den den ersten Basisbandmischereinrichtungen (40,42,44,46) nachgeschalteten ersten Filtereinrichtungen (48,50,52,54) zur Dezimation der Abtastwerte des abgetasteten Messsignals (22) im Basisband und der mit den Filtereinrichtungen (48,50,52,54) verbundenen Analyseeinrichtung (58) zur Analyse des Messsignals (22) zugeführt ist.1. Device, in particular a multi-channel oscilloscope (2), for the analysis of a multi-channel system (4) transmitted measuring signal (22), comprising a plurality of measuring channels (24,26,28,30) each comprising a scanning device (32,34,36 , 38), in each case a first baseband mixing device (40, 42, 44, 46), in each case a first filter device (48, 50, 52, 54), which is provided with an analysis device (58), wherein the measurement signal (22) corresponds to the respective scanning devices ( 32,34,36,38) is supplied to the measuring channels (24,26,28,30) for simultaneous scanning, and wherein the sampled measuring signal (22b) to the first baseband mixer means (40th) downstream of the scanning devices (32,34,36,38) , 42, 44, 46) for down-converting the measurement signal (22) into a baseband, the first filter devices (48, 50, 52, 54) connected downstream of the first baseband mixer devices (40, 42, 44, 46) for decimating the sampled values of the sampled measurement signal (22) in the baseband and with the filter devices (48,50,52,54) verbun which analysis device (58) for analyzing the measuring signal (22) is supplied.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Messkanäle (24,26,28,30) jeweils eine der ersten Filtereinrichtung (48,50,52) nachgeschaltete, zweite Basisbandmischereinrichtung (124,126,128) und jeweils eine zweite Filtereinrichtung (130,132,134), welche der jeweiligen zweiten Basisbandmischereinrichtung (124,126,128) nachgeschaltet ist, umfassen. 2. Device according to claim 1, characterized in that the measuring channels (24, 26, 28, 30) each have a first filter device (48, 50, 52) connected downstream, second baseband mixing device (124, 126, 128) and in each case a second filter device (130, 132, 134), which is downstream of the respective second baseband mixer (124, 126, 128).
3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass den ersten Filtereinrichtungen (48,50,52,54) bzw. den zweiten Filtereinrichtungen (130,132,134) ein Speichereinrichtung (56) zur Speicherung des Messsignals (22) nachgeschaltet ist.3. Apparatus according to claim 1 or 2, characterized in that the first filter means (48,50,52,54) and the second filter means (130,132,134) is followed by a memory means (56) for storing the measurement signal (22).
4. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die ersten Basisbandmischereinrichtungen4. Device according to one of claims 1 to 3, characterized in that the first baseband mixer means
(40,42,44,46) und/oder die ersten Filtereinrichtungen (48,50,52,54) bzw. die zweiten Basisbandmischereinrichtungen (124,126,128) und/oder die zweiten Filtereinrichtungen (130,132,134) zur Synchronisation der Messkanäle (24,26,28,30) laufzeitenkalibrierbar ausgebildet sind.(40, 42, 44, 46) and / or the first filter devices (48, 50, 52, 54) or the second baseband mixer devices (124, 126, 128) and / or the second filter devices (130, 132, 134) for the synchronization of the measuring channels (24, 26, 28,30) are formed running time calibrated.
5. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, dass an die ersten Basisbandmischereinrichtung (40,42,44,46), an die ersten Filtereinrichtung (48,50,52,54) und/oder an die zweiten5. Apparatus according to claim 4, characterized in that to the first baseband mixer means (40,42,44,46), to the first filter means (48,50,52,54) and / or to the second
Basisbandmischereinrichtung (124,126,128) und an die zweiten Filtereinrichtung (130,132,134) jeweils ein Zeitverzögerungsglied (150,152,154,156) zur Laufzeitenkalibrierung angeschlossen ist.Baseband mixer means (124,126,128) and to the second filter means (130,132,134) in each case a time delay element (150,152,154,156) is connected to the runtime calibration.
6. Vorrichtung nach Anspruch 5, gekennzeichnet durch einen Taktgeber (158,160,162,164) zur Ansteuerung der6. Apparatus according to claim 5, characterized by a clock (158,160,162,164) for controlling the
Zeitverzögerungsglieder (150,152,154,156), welche mit den ersten Basisbandmischereinrichtungen (40,42,44,46) der Messkanäle (24,26,28,30) und den ersten Filtereinrichtungen (48,50,52,54) der Messkanäle (24,26,28,30) und/oder den zweiten Basisbandmischereinrichtung (124,126,128) der Messkanäle (24,26,28,30) und den zweiten Filtereinrichtungen (130,132,134) der Messkanäle (24,26,28,30) verbunden sind.Time delay elements (150, 152, 154, 156) associated with the first baseband mixer means (40, 42, 44, 46) of the measurement channels (24, 26, 28, 30) and the first filter means (48, 50, 52, 54) of the measurement channels (24,26,28,30) and / or the second baseband mixer means (124,126,128) of the measuring channels (24,26,28,30) and the second filter means (130,132,134) of the measuring channels (24,26,28,30) are connected.
7. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass die ersten Basisbandmischereinrichtungen (40,42.44,46) dazu ausgebildet sind, das abgetastete Messsignal (22b) grob ins Basisband zu mischen.7. The device according to claim 2, characterized in that the first baseband mixer means (40,42.44,46) are adapted to roughly mix the sampled measurement signal (22b) in the baseband.
8. Vorrichtung nach Anspruch 7, dadurch gekennzeichnet, dass die zweiten Basisbandmischereinrichtungen (40,42,44,46) dazu ausgebildet sind, das grob ins8. The device according to claim 7, characterized in that the second baseband mixer means (40,42,44,46) are adapted to the gross in the
Basisband gemischte Messsignal (22) exakt ins Basisband zu mischen und dabei einen Basiband-Realteil und einen Basisband-Imaginärteil zu erzeugen.Baseband mixed measurement signal (22) to mix exactly baseband and thereby produce a baseband real part and a baseband imaginary part.
9. Vorrichtung nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass die ersten Basisbandmischereinrichtungen (40,42,44,46) und/oder die zweiten9. Device according to one of claims 1 to 8, characterized in that the first baseband mixer means (40,42,44,46) and / or the second
Basisbandmischereinrichtungen (130,132,134) jeweils digitale Oszillator (94 , 96, 98 ; 204 , 206, 208 ), insbesondere numerisch kontrollierte Oszillatoren (NCOl, NC02), zur Erzeugung einer Träger-Mischfrequenz umfassen.Baseband mixer means (130, 132, 134) each comprise digital oscillators (94, 96, 98, 204, 206, 208), in particular numerically controlled oscillators (NCO1, NC02), for generating a carrier mixing frequency.
10. Vorrichtung nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass das Mehrkanalsystem (4) ein Multiple-Input-Multiple- Output Kanalsystem (MIMO) oder ein Single-Input-Multiple- Output (SIMO) Kanalsystem ist. 10. Device according to one of claims 1 to 9, characterized in that the multi-channel system (4) is a multiple-input multiple-output channel system (MIMO) or a single-input multiple-output (SIMO) channel system.
11. Verfahren zur Analyse zumindest eines über ein Mehrkanalsystem (4) übertragenen Messsignals (22), welches mehreren Messkanälen (24,26,28,30), insbesondere eines Mehrkanal-Oszilloskops (2) zugeführt wird, welches an an den Messkanälen vorgesehenen11. Method for analyzing at least one measurement signal (22) transmitted via a multichannel system (4) which is supplied to a plurality of measurement channels (24, 26, 28, 30), in particular a multichannel oscilloscope (2), which is provided on the measurement channels
Abtasteinrichtungen (32,34,36,38) zur gleichen Zeit abgetastet wird, welches an den Abtasteinrichtungen (32,34,36,38) nachgeschalteten ersten Basisbandmischereinrichtungen (40,42,44,46) synchron in ein Basisband herabgemischt wird, und welches an den Basisbandmischereinrichtungen (40,42,44,46) nachgeschalteten ersten Filtereinrichtungen (48,50,52,54) zur Dezimation der Abtastwerte im Basisband synchron gefiltert und anschließend analysiert wird.Sampling (32,34,36,38) is sampled at the same time, which at the scanners (32,34,36,38) downstream first baseband mixer means (40,42,44,46) is mixed down synchronously in a baseband, and which The first filter devices (48, 50, 52, 54) connected downstream of the baseband mixer devices (40, 42, 44, 46) are synchronously filtered for decimation of the samples in the baseband and then analyzed.
12. Verfahren nach Anspruch 11, dadurch gekennzeichnet, dass die Messkanäle (24,26,28,30) zueinander synchronisiert werden.12. The method according to claim 11, characterized in that the measuring channels (24,26,28,30) are synchronized with each other.
13. Verfahren nach Anspruch 12, dadurch gekennzeichnet, dass die an den Messkanälen (24,26,28,30) angeordneten Basisbandmischereinrichtungen (40, 42, 44 , 46; 124 , 126, 128 ) und/oder die an den Messkanälen (24,26,28,30) angeordneten Filtereinrichtungen (48, 50, 52, 54 ; 130, 132, 134 ) zur Synchronisation der Messkanäle (24,26,28,30) taktgesteuert werden.13. The method according to claim 12, characterized in that arranged on the measuring channels (24,26,28,30) baseband mixer means (40, 42, 44, 46; 124, 126, 128) and / or on the measuring channels (24 , 26,28,30) arranged filter means (48, 50, 52, 54, 130, 132, 134) for the synchronization of the measuring channels (24,26,28,30) are clock-controlled.
14. Verfahren nach einem der Ansprüche 11 bis 13, dadurch gekennzeichnet, dass an den Basisbandmischereinrichtungen (40,42,44,46) aus dem abgetasteten Messsignal (22b) ein Basiband- Realteil und ein Basisband-Imaginärteil erzeugt werden. 14. The method according to any one of claims 11 to 13, characterized in that a baseband real part and a baseband imaginary part are generated at the baseband mixer devices (40, 42, 44, 46) from the sampled measurement signal (22b).
EP07785968A 2006-09-07 2007-07-10 Device and method for analyzing a measurement signal transmitted via a multichannel system Withdrawn EP2060036A1 (en)

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