WO2011107183A1 - Procédé et système de test d'une station relais - Google Patents

Procédé et système de test d'une station relais Download PDF

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Publication number
WO2011107183A1
WO2011107183A1 PCT/EP2011/000153 EP2011000153W WO2011107183A1 WO 2011107183 A1 WO2011107183 A1 WO 2011107183A1 EP 2011000153 W EP2011000153 W EP 2011000153W WO 2011107183 A1 WO2011107183 A1 WO 2011107183A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal
relay station
relay
test
evaluation
Prior art date
Application number
PCT/EP2011/000153
Other languages
German (de)
English (en)
Inventor
Martin Müller
Heinz Mellein
Original Assignee
Rohde & Schwarz Gmbh & 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 & Schwarz Gmbh & Co. Kg filed Critical Rohde & Schwarz Gmbh & Co. Kg
Publication of WO2011107183A1 publication Critical patent/WO2011107183A1/fr

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Classifications

    • 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
    • H04L1/24—Testing correct operation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/0082—Monitoring; Testing using service channels; using auxiliary channels
    • H04B17/0085—Monitoring; Testing using service channels; using auxiliary channels using test signal generators
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/40—Monitoring; Testing of relay systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/155—Ground-based stations
    • 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
    • H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector
    • 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
    • H04L2001/0092—Error control systems characterised by the topology of the transmission link
    • H04L2001/0097—Relays

Definitions

  • the invention relates to a method and a system for measuring a relay station.
  • relay stations In the prior art relay stations have only the function of an amplifier for the enhanced forwarding of signals between a base station and a mobile station or another base station. Accordingly, testing methods and testing devices for normal amplifiers have been used to test such relay stations. Problems of the prior art relay stations have been that they not only amplify the signal but also their errors. Therefore, new generation relay stations, in addition to the amplifier function of the signal, incorporate some intelligence used to improve information transmission.
  • the object of the invention is to provide a test method and a test system which tests described complex relay stations and provides meaningful results on the quality of the relay station.
  • a first signal is generated in a signal generator and sent via a transmitting device to the relay station.
  • the relay station receives the first signal and determines the information content of the first signal.
  • a second signal is generated in the relay station. This second signal is sent by the relay station. This second signal is received at a receiving device.
  • a size of the newly generated, sent and retrieved information content received second signal is measured in a measuring device. The measured variable is evaluated in an evaluation device with respect to a known size of the first signal and further processed to a property of the relay station.
  • the object is further achieved by the system for testing a relay station according to claim 8.
  • This system has a signal generator for generating a first signal.
  • the signal generator is suitable for simulating at least a known size of the first signal.
  • a transmitting device for transmitting the generated first signal.
  • the system includes a relay station including a relay receiving device for receiving the first signal, a relay reading device for detecting the content of the first signal
  • a relay signal generating device for generating a second signal from the detected content of the first signal and a relay sending device for transmitting the second signal.
  • the system also includes a receiving device for receiving the second signal transmitted by the relay station.
  • the system shows a measuring device for measuring a size of the second signal generated in the relay station and received in the receiving device.
  • the system shows an evaluation device for evaluating the measured magnitude of the second signal in relation to the known magnitude of the first signal to a characteristic of the relay station.
  • the evaluation device is connected to the signal generator.
  • the system and method according to the invention are distinguished, above all, from the state of the art in that the measuring device has a size of the second signal which has been newly generated in the relay station on the basis of a content evaluation of the first signal and not was simply amplified, measured and put in relation to a corresponding size of the first signal in relation. This makes it possible to measure the positive or negative characteristics of a relay station of the modern generation.
  • the subclaims relate to advantageous developments of the invention. It is advantageous that the measured size of the second signal with respect to a known size of the first signal and on the basis of at least one further, the second signal defining variable, for. B. a modulation of the second signal is evaluated. This leads to a more accurate determination of the property of the relay station. Especially in modern relay stations, which change a variety of sizes (modulation type, carrier frequency, ...) from the first to the second signal, the property of the relay station is particularly meaningful if the measured size to the known size and in addition to further, the second signal defining quantities is related.
  • the relay station changes at least the further, the second signal defining size compared to the first signal and that the measured size in addition to the known size of the first signal on the basis of the change of the further signal defining the size in comparison evaluates to the first signal to a property.
  • the further parameters defining the second signal the relationship between the measured size of the second signal and the known size of the first signal becomes more important.
  • the change in the measured and known quantity can only take into account the change in the first and second signals Sizes give a meaningful property of the relay station.
  • the known and the measured variable are each an error vector quantity, an error rate or a signal-to-noise ratio.
  • the known size of the first signal is preferably not ideally adjusted at the signal generator, i. H. the first signal is selectively set as a faulty or noisy signal to the signal generator.
  • test system and the test method determines a delay between the reception time of the first signal and the transmission time of the second signal.
  • the measurement of relay station delay is particular to so-called “round-trip-time", which is the time of a signal in a base station, relay station and mobile station system needed for signal transmission over all three stations and back becomes particularly important
  • Fig. 1 shows an embodiment of the invention
  • Test system for testing a relay station ; and 2 shows a flow chart of the method according to the invention for testing a relay station.
  • Fig. 1 shows a first embodiment of the system according to the invention.
  • the test system 1 has a signal generator as the first test device 2, a relay station 3 and a second test device 4.
  • the first test device 2 functions as a transmitting part of the test system 1, which sends the relay station 3 a test signal as a first signal.
  • the relay station determines its content and forwards the content of the test signal to the second test device 4 as a second signal by means of a relay signal newly generated from the content of the test signal.
  • the first signal arriving in a first format is evaluated according to its format, e.g. B. by performing a first demodulation.
  • the content thus determined forms the basis for generating the second signal in a second format.
  • the first and second formats may differ, for example, in the modulation type as an essential property of the signal.
  • the second test device 4 evaluates the received second signal to make a statement about the relay station 3.
  • the relay station 3 communicates with the two test devices 2 and 4, as with the two communication partners whose communication the relay station 3 is to ensure. In the case of mobile communications, these communication partners are the base station and the mobile station or alternatively also two base stations.
  • the test system 1 of the exemplary embodiment relates to relay stations of the mobile radio and the transmitted signals are preferably electromagnetic radio signals, in particular radio signals in the frequency ranges provided for the mobile radio.
  • the first test device 2 has a signal generator 21.
  • the signal generator 21 is adapted to generate a signal having a first format of the relay 3 to be tested.
  • the signal generator 21 may generate a signal having multiple possible formats of the mobile radio.
  • the signal generator 21 may continue to be real
  • an error vector magnitude (EVM) greater than zero is realized
  • the test signal could be manipulated to have a certain defined and known bit error rate greater than zero
  • SNR signal-to-noise ratio
  • the ideal EVM and the ideal bit error rate are zero and the ideal SNR is infinite. These are only selected examples for the simulation of real conditions.
  • the signal generator 21 is also capable of simulating complex conditions such as fading or distortion
  • the signal generator 21 is connected to an output interface 22 via which the signal generator 21 can output the generated test signal or the quantities describing the generated test signal.
  • the quantities describing the test signal are, above all, the format of the test signal, which includes, for example, the modulation, error correction mechanisms, transmission channels, etc.
  • the signal generator 21 further allows the test signal to be used as a high frequency signal in the first layer of the OSI layer model As a result, the function of the relay station 3 can be isolated without testing the errors by modulation and demodulation to and from a high-frequency signal
  • the tester 2 is further connected to a transmitting and receiving device 23.
  • the transmitting and receiving device 23 is connected to a transmission interface 24.
  • a transmission cable 5 is connected.
  • an antenna of a radio interface can also be used as the transmission path.
  • the transmitting and receiving device 23 amplifies the test signal of the signal generator 21 and outputs it to the transmission interface 24.
  • the transmitting and receiving device 23 is also suitable for receiving signals arriving at the transmission interface 24 and passing them on to a read-out device 25 for determining the signal content.
  • the read-out device 25 can further determine the quantities which define the received signal, for example from the header information of the received signal, and determine in a measuring device 29 the quantities which describe the received signal, such as
  • the first test device 2 also has an evaluation device 26, an output device 27 and an input interface 28. These will be described in more detail below in connection with the second test device 4.
  • the relay station 3 has a first
  • Transmission interface 31, which is connected via the cable 5 to the transmission interface 24 of the first test device 2.
  • the first transmission interface 31 of the relay station 3 is in turn connected to a transmitting and receiving device 32.
  • the transmitting and receiving device 32 is further connected to a second transmission interface 33 of the relay station 3, wherein both transmission interfaces 31 and 33 of the relay station may be suitable both for receiving and for transmitting signals. Accordingly, then the transmitting and receiving device 32 is both for transmitting and for receiving signals, in particular Radio signals, suitable.
  • the test signal transmitted by the first test device 2 via the cable 5 is received by the transmitting and receiving device 32 and passed on to a read-out device 34.
  • the transmitting and receiving device 32 may be connected to other transmission interfaces to
  • MIMO Multiple Input Multiple Output
  • the relay station 3 is provided only for a transmission direction. Then, the first test device satisfies a pure transmitting device and the second test device 4 a pure receiving device. These are then each connected to a unidirectional interface.
  • the read-out device 34 contains all means necessary to demodulate the modulated high-frequency signal and to determine the content transmitted with the test signal.
  • the read-out device 34 preferably also contains different error correction mechanisms depending on the tested mobile radio standard.
  • the readout device 34 in the signal generator 21 or by subsequent signal change generated errors, eg. B. bit error, correct by attached to the transmission blocks of the test signal in the signal generator 21 checksums.
  • the readout device 34 may continue to be suitable for compensating for systematic or random errors.
  • the readout device 34 preferably further comprises a measuring device 37, the error, such. B. bit error rate, the test signal after the error correction measure.
  • the procedures for this are defined by the mobile radio standard.
  • the read-out device 34 can furthermore be suitable for determining control information from the test signal and for determining the format of the signal output by the relay station or of a signal sent to the first test device 2 in accordance with the control information transmitted.
  • a possible Control information could also be the prioritization of the test signal, whereupon the read-out device 34 allows a faster processing of the test signal, for. B. by omitting error corrections, can cause.
  • the prioritization could also be realized by prepending the prioritized signal in the processing queue of signals.
  • the relay station 3 further has a control device 35, which is connected to the read-out device 34 and a signal-generating device 36.
  • the controller 35 receives from the readout device 34 the detected contents of the test signal, measured quantities, and the quantities defining the format of the test signal, such as modulation, error correction mechanisms, scheduling of the frequency / time resources, and so forth control information or other information about the communication with the relay station 3 with the first or the second test device 2 or 4 obtained from the first or the second test device 2 or 4.
  • the control device 35 forms, as it were, the intelligence of the relay station 3.
  • the control device 35 of the relay station 3 decides on the format of the relay signal to be used, ie the signal transmitted from the relay station 3 to the second test device 4, based on all the stored information and based on the content of the test signal based on stored decision rules in the read-out device 34 than. If the control device 35 z. For example, if the connection to the second test device 4 is known to be very poor, the modulation may use a more secure modulation type such as PSK (PSK: Phase Shift Keying) instead of a QAM (Quadrature Amplitude Modulation) 64 signal become.
  • PSK PSK: Phase Shift Keying
  • QAM Quadrature Amplitude Modulation
  • the control device 34 outputs the determined contents of the test signal and the format of the relay signal to be used to the signal generating device 36.
  • the content of the test signal can be given directly from the read-out device 34 to the signal generating device 36.
  • the signal generating device 35 generates a relay signal as a second signal from the content of the content of the test signal determined in the read-out device 34.
  • the signal generation includes all steps such as adding a checksum, modulating the contents to a modulation scheme selected by the control device 35 of the relay station 3 and upmixing to a high-frequency signal which was also determined by the control device 35.
  • the relay signal can also be generated as a signal of the second or third layer of the OSI reference model.
  • the signal generation device 36 forwards the generated relay signal to the transmitting and receiving device 32, which amplifies the signal and outputs it to the second transmission interface 33.
  • the second transmission interface 33 of the relay station 3 is connected via the transmission cable 6 to the second test device 4 by means of the transmission interface 44 of the second test device 4.
  • the second test device 4 is constructed the same as the first test device 2 in this embodiment. Accordingly, the second test device 4 also contains a transmitting and receiving device 43, a signal generator 41, a read-out device 45, an evaluation device 46, an output device 47 and input and output interfaces 48 and 42 and the transmission interface 44. Each Execution to the first test device 2 or the second test device 4 applies accordingly to the other test device 4 or 2. Thus, for example, the functions of the signal generator 41 of the second test device 4 have already been described in connection with the signal generator 21 of the first test device 2.
  • the relay signal sent from the relay station 3 via the transmission cable 6 and the transmission interface 44 is received in the transmitting and receiving device 43.
  • the transmitting and receiving device 43 is connected to a read-out device 45.
  • Readout device 45 similarly includes
  • Read-out device 34 of the relay station 3 all means for determining the content of the relay signal such.
  • demodulator error correction mechanisms and corresponding mixer to a high-frequency signal in a
  • the read-out device 45 includes a measuring device 49, which can measure a size of the relay signal.
  • the measuring device 49 measures the error vector quantity EVM of the relay signal.
  • SNR signal-to-noise ratio
  • BER bit error rate
  • the error-free content is given by the signal generator 21 of the first test device 2 via the output interface 22 of the first test device and the input interface 48 of the second test device 4 to the measuring device 49.
  • the measured in the measuring device 49 size here the error vector size EVM, is given to the evaluation device 46.
  • the evaluation device 46 evaluates the determined measured variable of the measuring device 49.
  • the evaluation device 46 is is also connected to an input interface 48 which is connected in the embodiment via the further cable 7 to the output interface 22 of the signal generator 21 of the first test device 2.
  • the evaluation device 46 of the second test device 4 receives the format as the variables defining the test signal and the error vector quantity EVM as the size of the test signal simulated or set at the signal generator 21 of the first test device 2 and those in the measuring device 49
  • the signal generator 21 of the first tester 2 transmits the error vector quantity EVM simulated on the test signal to the evaluator 46.
  • the signal generator 21 of the first tester 2 transfers the format of the transmitted test signal as the signal defining the test signal to the evaluation device 46 of the second test device 4 by means of the cable 7.
  • the read-out device 45 reads out the format of the relay signal and also outputs this to the evaluation device 4 6.
  • the evaluation device 46 now sets as evaluation the error vector quantity EVM of the relay signal with the error vector quantity EVM of the test signal in relation.
  • the quotient is formed from the EVM of the relay signal to the EVM of the test signal.
  • the evaluation device 46 evaluates the improvement of the EVM if there is an improvement in the EVM.
  • the evaluation device 46 can receive from the measuring device 49 a bit error rate measured in the relay signal and from the signal generator 21 of the first test device 2 a simulated bit error rate of the test signal.
  • the signal generator 21 sets the bit error rate so An "intelligent" relay station 3 would have to transmit the data density of the relay signal by a lower modulation in the relay signal compared to the test signal Examples of digital modulations are with increasing data density QPSK, 16QAM, 32QAM, 64QAM
  • the evaluation device 46 can now look at the bit error rate as a function of the modulation of the test signal and the modulation of the relay signal, resulting in a function over a longer evaluation cycle with different settings
  • the change in the bit error rate could also be plotted directly via a change in the modulation from the test signal to the relay signal Bit error rate to the change of the modulation or another the quality of transmission affecting parameter of the format can be made a meaningful quality assessment of the relay station 3.
  • the change of a signal-to-nois could also be plotted directly
  • the result of the evaluation device 46 is given to an output device 47.
  • the output device 47 can be connected via an interface with a computer, via which the data of the evaluation for further processing or only for presentation are transmitted.
  • the output device 47 may also include a display, the z. B. represents the three-dimensional graph of bit error rate BER on the modulation of the test signal and the modulation of the relay signal.
  • the signal generators 21 and 41 may preferably each simulate both the signals of a base station and the signals of a mobile station.
  • the illustrated test system 1 can simulate both the communication between two base stations or between a mobile station and a base station, or between a base station and a mobile station. In the illustrated embodiment, only one transmission direction is tested.
  • the output interface 42 of the second test device 4 could additionally be connected to the input interface 28 of the first test device 2.
  • the relay station 3 could be tested by simultaneous data transmission in two directions.
  • a second test signal is generated by the second test device 4 in the signal generator 41 with a simulated bit error rate and sent via the transmitting and receiving device 43 of the second test device 4 to the transmitting and receiving device 32 of the relay station 3. In this way, on the one hand, it can be tested to what extent the double load due to the two-sided communication in the relay station 3 influences the change of the bit error rate of the relay signal to the first test signal.
  • the evaluation device 46 could evaluate the change in the bit error rate from the relay signal to the test signal as a function of the simulated bit error rate of the second test signal. It is thereby tested whether the relay station 3 advantageously uses information of the second test signal, which contains information about the transmission link to be traveled by the relay signal.
  • an intelligent relay station e.g. B. by switching to a safer Modulation type such. As QPSK, try to improve the bit error rate BER of the relay signal.
  • the first test device 2 could send a relay signal from the relay 3 transmitted second relay signal, which is generated from the content of the second test signal, similar evaluations and the results to a common evaluation device, such. As a computer, give. As a result, further influences can be examined by the two-way communication to the relay station 3.
  • the system 1 is also or alternatively suitable for measuring the delay time in the relay station 3. For this purpose, a difference is determined from the measured in the measuring device 49 arrival time of the relay signal in the second test device 4 and the dispatch time of the test signal in the signal generator 21 of the first tester 2 and additionally the known time for transmitting a signal from the signal generator 21 of the first test device. 2 via the cables 5 and 6, which are directly connected without the relay station 3, to the second test device 4. This makes it possible to determine the proportion of the relay station 3 at the transit time RTT (RTT: Round Trip Time).
  • RTT Round Trip Time
  • the invention is not limited to the embodiment described. Rather, z.
  • the devices contained in the first test device 2 and devices contained in the second test device 4 can be realized in a single test device.
  • the system 1 is particularly suitable for relay stations 3, which have a certain "intelligence", ie which reads out the contents of the test signal sent with a first format and based on Decision criteria from the content of the test signal generates a relay signal with a second format and thus retransmit the content of the test signal.
  • 2 shows a simplified flow chart of the method according to the invention for measuring intelligent relay stations.
  • a test signal is generated as the first signal in the signal generator 21 of the first test device 2.
  • Signal generation errors and transmission errors are simulated in the signal generator 21; in particular, an error vector variable EVM not equal to zero is simulated in this exemplary embodiment.
  • the test signal generated in the signal generator 21 is transmitted via the interface 24 in a second step S2 by means of the transmitting and receiving device 23.
  • the test signal is received by the relay station 3 in the transmitting and receiving device 32.
  • the content of the test signal in the read-out device 34 of the relay station 3 is determined in the relay station 3.
  • the read-out device 34 of the relay station 3 additionally reads out the variables defining the test signal from the head information of the test signal.
  • the read-out device 34 could also measure magnitudes of the test signal, which gives an indication of the signal quality. All this information is analyzed in a fifth step S5 in a control device 35 and evaluated taking into account any further information on a format of a relay signal to be generated. The format of the relay signal is chosen so that the information collected in the control device 35 is taken into account in the best possible way. In a sixth step S6 is in a
  • Signal generating device 36 of the relay station 3 generates a relay signal as a second signal with the predetermined by the control device 35 format.
  • the relay signal is in a seventh step S7 of the Transmitting and receiving device 32 of the relay station 3 via the transmission interface 33 is sent.
  • the relay signal is received in the transmitting and receiving device 43 of the second testing device 4.
  • the relay signal is measured in a read-out device 45, which contains a measuring device 49.
  • the measuring device 49 measures a size of the relay signal, which gives an indication of the signal quality.
  • the measuring device 49 measures the error vector quantity EVM of the relay signal.
  • the measured error vector quantity EVM is evaluated in relation to the error vector quantity EVM of the test signal in the evaluation device 46 of the second test device 4.
  • the EVM of the test signal is given by the signal generator 21 of the first test device 2 via a cable connection to the evaluation device 46 of the second test device 4.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Quality & Reliability (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)

Abstract

L'invention concerne un procédé et un système permettant de tester une station relais (3) afin d'acheminer des contenus de signaux entrants. Le système (1) comporte un générateur de signaux (21) servant à générer un premier signal, au moins une grandeur connue du premier signal étant simulable. Le système (1) comprend en outre un dispositif d'émission (23) servant à émettre le premier signal généré. Une station relais (3) du système (1) comporte un dispositif de réception relais servant à recevoir le premier signal, un dispositif de lecture relais (34) servant à déterminer le contenu du premier signal, un dispositif de génération de signal relais (36) servant à générer un second signal à partir du contenu du premier signal et un dispositif d'émission relais servant à émettre le second signal. Un dispositif de réception (43) du système (1) reçoit le second signal et un dispositif de mesure (49) mesure la grandeur du second signal généré dans la station relais (3) et reçu dans le dispositif de réception. Un dispositif d'évaluation (46) évalue la grandeur mesurée du second signal sur la base d'une grandeur connue du premier signal par rapport à une propriété de la station relais (3).
PCT/EP2011/000153 2010-03-05 2011-01-14 Procédé et système de test d'une station relais WO2011107183A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010010349A DE102010010349A1 (de) 2010-03-05 2010-03-05 Verfahren und System zum Testen einer Relaisstation
DE102010010349.7 2010-03-05

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WO2011107183A1 true WO2011107183A1 (fr) 2011-09-09

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN117320108A (zh) * 2023-10-12 2023-12-29 重庆交通建设(集团)有限责任公司 基于5g网络传输的隧道信息管理系统及应用

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US4221939A (en) * 1979-05-07 1980-09-09 Bell Telephone Laboratories, Incorporated Method and apparatus for determining the tuned frequency of a digital repeater
DE10130687A1 (de) * 2001-06-26 2003-01-02 Rohde & Schwarz Meßsystem mit einem Referenzsignal zwischen einem Signalgenerator und einem Signalanalysator
GB2440190A (en) * 2006-07-14 2008-01-23 Agilent Technologies Inc Device and method for testing a receiver
DE102008018385A1 (de) * 2008-04-11 2009-10-15 Rohde & Schwarz Gmbh & Co. Kg Testgerät zum Testen der Übertragungsqualität eines Funkgeräts
DE102008063612A1 (de) * 2008-04-15 2009-10-22 Rohde & Schwarz Gmbh & Co. Kg Verfahren zum Testen der Übertragungszustände eines Messgeräts

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US20050213965A1 (en) * 2004-03-24 2005-09-29 Bergmann Ernest E Communications testing apparatus and method of use

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4221939A (en) * 1979-05-07 1980-09-09 Bell Telephone Laboratories, Incorporated Method and apparatus for determining the tuned frequency of a digital repeater
DE10130687A1 (de) * 2001-06-26 2003-01-02 Rohde & Schwarz Meßsystem mit einem Referenzsignal zwischen einem Signalgenerator und einem Signalanalysator
GB2440190A (en) * 2006-07-14 2008-01-23 Agilent Technologies Inc Device and method for testing a receiver
DE102008018385A1 (de) * 2008-04-11 2009-10-15 Rohde & Schwarz Gmbh & Co. Kg Testgerät zum Testen der Übertragungsqualität eines Funkgeräts
DE102008063612A1 (de) * 2008-04-15 2009-10-22 Rohde & Schwarz Gmbh & Co. Kg Verfahren zum Testen der Übertragungszustände eines Messgeräts

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117320108A (zh) * 2023-10-12 2023-12-29 重庆交通建设(集团)有限责任公司 基于5g网络传输的隧道信息管理系统及应用

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