EP2060036A1 - Dispositif et procédé d'analyse d'un signal de mesure transmis par un système multicanal - Google Patents

Dispositif et procédé d'analyse d'un signal de mesure transmis par un système multicanal

Info

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Withdrawn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
Other languages
German (de)
English (en)
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/fr
Withdrawn legal-status Critical Current

Links

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

L'invention concerne un dispositif, notamment un oscilloscope multicanal (2), destiné l'analyse d'au moins un signal de mesure (22) transmis par un système multicanal (4) et comprenant plusieurs canaux de mesure (24, 26, 28, 30) comportant respectivement un dispositif de balayage (32, 34, 36, 38), respectivement un dispositif de mixage bande de base (40, 42, 44, 46), respectivement un dispositif filtrant (48, 50, 52, 54) et un dispositif d'analyse (58). Le signal de mesure (22) est cédé aux canaux de mesure (24, 26, 28, 30) et aux différents dispositifs de balayage (32, 34, 36, 38) destinés à un balayage simultané. Le signal de mesure balayé (22b) est cédé aux dispositifs de mixage bande de base (40, 42, 44, 46) qui sont montés en aval des dispositifs de balayage (32, 34, 36, 38) et sont destinés au mixage vers le bas du signal de mesure (22) vers la bande de base, aux dispositifs filtrants (48, 50, 52, 54) qui sont montés en aval des dispositifs de mixage bande de base (40, 42, 44, 46) et sont destinés à la décimation des valeurs échantillonnées du signal de mesure (22) dans la bande de base et enfin au dispositif d'analyse (58) qui est relié aux dispositifs filtres (48, 50, 52, 54) et est destiné à l'analyse du signal de mesure (22).
EP07785968A 2006-09-07 2007-07-10 Dispositif et procédé d'analyse d'un signal de mesure transmis par un système multicanal Withdrawn EP2060036A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006042114A DE102006042114A1 (de) 2006-09-07 2006-09-07 Vorrichtung und Verfahren zur Analyse eines über ein Mehrkanalsystem übertragenen Messsignals
PCT/EP2007/006102 WO2008028532A1 (fr) 2006-09-07 2007-07-10 Dispositif et procédé d'analyse d'un signal de mesure transmis par un système multicanal

Publications (1)

Publication Number Publication Date
EP2060036A1 true EP2060036A1 (fr) 2009-05-20

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP07785968A Withdrawn EP2060036A1 (fr) 2006-09-07 2007-07-10 Dispositif et procédé d'analyse d'un signal de mesure transmis par un système multicanal

Country Status (4)

Country Link
US (1) US8040125B2 (fr)
EP (1) EP2060036A1 (fr)
DE (1) DE102006042114A1 (fr)
WO (1) WO2008028532A1 (fr)

Cited By (1)

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CN106324313A (zh) * 2016-08-08 2017-01-11 电子科技大学 基于近似熵的瞬态信号无缝测量系统

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US9297834B2 (en) * 2010-08-13 2016-03-29 Tektronix, Inc. Time-domain searching in a test and measurement instrument
US9459290B2 (en) 2013-04-30 2016-10-04 Keysight Technologies, Inc. Oscilloscope system and method for simultaneously displaying zoomed-in and zoomed-out waveforms
US10962575B2 (en) * 2017-08-25 2021-03-30 Rohde & Schwarz Gmbh & Co. Kg Multi-domain measurement system as well as use of a multi-domain measurement system

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106324313A (zh) * 2016-08-08 2017-01-11 电子科技大学 基于近似熵的瞬态信号无缝测量系统
CN106324313B (zh) * 2016-08-08 2018-09-07 电子科技大学 基于近似熵的瞬态信号无缝测量系统

Also Published As

Publication number Publication date
US20100007329A1 (en) 2010-01-14
US8040125B2 (en) 2011-10-18
DE102006042114A1 (de) 2008-03-27
WO2008028532A1 (fr) 2008-03-13

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