WO1995034823A1 - Procede et dispositif permettant de mesurer l'intensite de champ dans un canal radio et ses canaux adjacents a l'aide d'une force d'insertion nulle - Google Patents

Procede et dispositif permettant de mesurer l'intensite de champ dans un canal radio et ses canaux adjacents a l'aide d'une force d'insertion nulle Download PDF

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Publication number
WO1995034823A1
WO1995034823A1 PCT/EP1995/000436 EP9500436W WO9534823A1 WO 1995034823 A1 WO1995034823 A1 WO 1995034823A1 EP 9500436 W EP9500436 W EP 9500436W WO 9534823 A1 WO9534823 A1 WO 9534823A1
Authority
WO
WIPO (PCT)
Prior art keywords
frequency range
local oscillator
signal
oscillator signal
field strength
Prior art date
Application number
PCT/EP1995/000436
Other languages
German (de)
English (en)
Inventor
Rainer Perthold
Heinz GERHÄUSER
Original Assignee
Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
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 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. filed Critical Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
Publication of WO1995034823A1 publication Critical patent/WO1995034823A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
    • G01R29/08—Measuring electromagnetic field characteristics
    • G01R29/0864—Measuring electromagnetic field characteristics characterised by constructional or functional features
    • G01R29/0892—Details related to signal analysis or treatment; presenting results, e.g. displays; measuring specific signal features other than field strength, e.g. polarisation, field modes, phase, envelope, maximum value
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/318—Received signal strength
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/354—Adjacent channel leakage power

Definitions

  • the present invention relates to a method and a device for measuring the field strength in a radio channel and its adjacent channels by means of zero IF.
  • the main area of application of the method and the device according to the invention is in the field of industrial remote controls.
  • systems for radio remote control in the industrial area it may be necessary, because of the dense occupancy of the frequency bands used, to check whether the set channel is already being used by other users before the transmitter is started up. In this case, the transmitter must change to another frequency and check the assignment there again.
  • This search process before the connection is established is compulsory in some countries, but in principle makes sense in any case in order to avoid collisions.
  • one possibility is to use the unmodulated signal of the transmitter as a local oscillator signal. This eliminates the need for a separate frequency synthesis in the receiver. In this case, however, it is necessary to increase the tuning range of the transmitter by the amount of the intermediate frequency.
  • Another disadvantage is that after the field strength has been measured, the transmitter must first be switched back to the transmission frequency, as a result of which the settling time to be observed effectively increases the time required for measuring the field strength.
  • a known method for measuring the field strength in a radio channel is field strength measurement using zero IF.
  • the field strength measurement by means of zero IF takes place in such a way that a high-frequency signal, the power of which has to be determined, is converted directly into the baseband via a mixer.
  • An existing transmitter serves as the local oscillator.
  • the LF signal is amplified logarithmically and the peak value of this amplified LF signal serves as a measurement variable. This can be determined using an appropriate rectifier and is proportional to the peak value of the RF signal within the selected channel.
  • An optional low-pass filter enables the measured value to be averaged.
  • the principle of zero-IF described above has some fundamental disadvantages as soon as no complex IQ demodulator is used for frequency conversion. In this case, the amplitude of the RF signal, the frequency of which is close to that of the local oscillator, can no longer be clearly determined within the specified measurement time.
  • EP-0583027 discloses a circuit arrangement for determining the field strength of an FM transmitter with a demodulator, a comparator, an integrator stage and a microprocessor. This known arrangement relates to the fastest possible evaluation of a detected electrical field strength of an FM transmitter in order to determine whether a switchover to a new frequency of the same FM transmitter is to be carried out. This is not a matter of determining whether the new frequency is occupied, since it is assigned to the same FM transmitter and is therefore in any case occupied, but merely a determination of whether the electrical field strength provided is sufficient to justify changing the frequency of the FM transmitter.
  • EP-0236946 discloses a movable receiver unit with a function for providing information relating to the intensity of an electric field with a receiver unit, a level detector, a level memory and a level comparator for generating a gradient of the field strength to indicate a direction in which the Intensity of the electric field increases.
  • This known device serves to indicate to a user of a mobile phone the direction in which he has to move in order, in the event that he has left the service area of the mobile phone network, to return to an area in which he has the mobile phone can use the phone.
  • This known unit only detects the intensity of the electric field over a wide frequency range and determines whether the user is inside or outside the service area of the mobile phone network, i. H. whether it is possible to operate the mobile phone.
  • a method for measuring the adjacent channel power in a transmission transmission in which a radio frequency useful signal with a frequency or phase-modulated local oscillator signal is mixed, a frequency range is selected in the baseband, the power is measured in the selected frequency range and the detected value is processed.
  • the present invention is based on the object of measuring and evaluating the field strength within a radio channel with measuring times in the millisecond range by means of the zero-IF method, the power in neighboring channels being weakened into the measurement, it is irrelevant which type of modulation the user of the channel uses and what the exact carrier frequency is.
  • This invention is achieved by a method and a device for determining the field strength in a radio channel and its neighboring channels by means of zero IF according to claim 1 and claim 4.
  • the present invention provides a method for determining the field strength in a radio channel and its neighboring channels by means of zero IF, which comprises the following steps:
  • the present invention provides a device for measuring the field strength in a radio channel and its neighboring channels by means of zero IF, which has the following features:
  • a device for mixing an HF useful signal and a frequency-modulated local oscillator signal the frequency range of the local oscillator signal essentially corresponding to the frequency range of the HF useful signal and the local oscillator signal having an essentially constant spectral power density over its frequency range having;
  • a filter device for selecting a frequency range in the baseband
  • a detection device for detecting a value characteristic of the power in the selected frequency range
  • a device for evaluating the detected value characteristic of the power in order to determine the field strength in the to determine the selected frequency range a device for evaluating the detected value characteristic of the power in order to determine the field strength in the to determine the selected frequency range.
  • the present invention is based on the knowledge that the problems described in the field strength measurement by means of zero IF are solved by using a frequency-modulated local oscillator whose spectral power density is constant over the frequency range which essentially corresponds to the frequency range of the RF signal. This ensures that regardless of the position of the RF signal to be measured within the measurement bandwidth, a power proportional to the power of the RF signal is converted into the baseband.
  • the value recorded, which is characteristic of the power, can be the effective or the peak value.
  • the present invention makes it possible to use an existing transmitter as the local oscillator of a receiver for determining the field strength in a radio channel.
  • the transmitter does not have to be modified for this, it only has to be frequency modulatable.
  • An advantage of the present invention is that the space requirement of the system according to the invention is less than that of a conventional super heterodyne receiver, since no bulky filters are required. Furthermore, the cost is lower.
  • FIG. 1 shows an embodiment of the device according to the invention for determining the field strength in a radio channel and its neighboring channels by means of zero IF.
  • the circuit in FIG. 1 comprises an antenna 100 in order to receive the HF useful signal 102.
  • the HF useful signal 102 has a frequency range which extends from 407 MHz to 481 MHz.
  • a suitable frequency range is filtered out of the HF useful signal 102 by a suitable circuit, which in the preferred exemplary embodiment is formed by a series connection of a first HF bandpass 104, a preamplifier 106, a second HF bandpass 108 and a buffer amplifier 110 and fed to a mixer 112.
  • the HF useful signal is mixed in the mixer 112 with a frequency-modulated local oscillator signal 114.
  • the frequency-modulated local oscillator signal is generated by a transmitter 116 and a device 118 for modulating the local oscillator signal generated by the transmitter 116.
  • the device 118 is connected to the transmitter 116.
  • the transmitter 116 comprises a series connection of a low pass 120, an oscillator 122 and an amplifier 124, which are connected between a first connection 126 and a second connection 128.
  • the device 118 is connected to the first connection 126 of the transmitter 116.
  • the output signal 130 of the mixer 112 is fed to a circuit in order to select a frequency range in the baseband. len.
  • This circuit comprises a series connection of a first LF bandpass 132, an LF amplifier 134, a second LF bandpass 136, a logarithmic amplifier 138, a peak value detector 140 and a video filter 142.
  • This circuit is between the mixer 112 and the output 144 of the device switched.
  • the evaluation device (not shown), which carries out the evaluation of the detected peak value.
  • B. includes an analog / digital converter or a comparator.
  • the device 118 for modulating the local oscillator signal is, for example, a device for generating a binary pseudo-random sequence.
  • device 118 provides a chirp signal in order to modulate the local oscillator signal generated by transmitter 116.

Landscapes

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

Abstract

L'invention concerne un procédé qui permet de déterminer l'intensité de champ dans un canal radio et ses canaux adjacents, à l'aide d'une force d'insertion nulle. Ce procédé comprend la mise à disposition d'un signal utile H.F. ayant une première gamme de fréquences; la mise à disposition d'un signal d'oscillateur local à modulation de fréquence, dont la gamme de fréquences correspond sensiblement à la première gamme de fréquences, et qui présente une puissance volumique spectrale sensiblement constante; le mélange du signal utile H.F. et du signal d'oscillateur local à modulation de fréquence; la sélection d'une gamme de fréquences dans la bande de base; la détection d'une valeur caractéristique de la puissance, dans la gamme de fréquences sélectionnée; et l'évaluation de ladite valeur, pour déterminer l'intensité de champ dans la gamme de fréquences sélectionnée.
PCT/EP1995/000436 1994-06-10 1995-02-07 Procede et dispositif permettant de mesurer l'intensite de champ dans un canal radio et ses canaux adjacents a l'aide d'une force d'insertion nulle WO1995034823A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP4420448.5 1994-06-10
DE4420448A DE4420448C1 (de) 1994-06-10 1994-06-10 Verfahren und Vorrichtung zur Messung der Feldstärke in einem Funkkanal und dessen Nachbarkanälen mittels Zero-IF

Publications (1)

Publication Number Publication Date
WO1995034823A1 true WO1995034823A1 (fr) 1995-12-21

Family

ID=6520358

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1995/000436 WO1995034823A1 (fr) 1994-06-10 1995-02-07 Procede et dispositif permettant de mesurer l'intensite de champ dans un canal radio et ses canaux adjacents a l'aide d'une force d'insertion nulle

Country Status (2)

Country Link
DE (1) DE4420448C1 (fr)
WO (1) WO1995034823A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114244384A (zh) * 2021-12-20 2022-03-25 浙江嘉科电子有限公司 一种用于零中频接收机的连续波峰值捕获电路及方法

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5726576A (en) * 1996-04-10 1998-03-10 Mitsubishi Denki Kabushiki Kaisha Microwave sensor for detecting a discharge occurring in an electrical apparatus
DE20109814U1 (de) 2001-06-13 2002-10-31 Marconi Communications GmbH, 71522 Backnang Vorrichtung zur Überwachung von Strahlung
US7698550B2 (en) 2002-11-27 2010-04-13 Microsoft Corporation Native wi-fi architecture for 802.11 networks
DE10350063A1 (de) * 2003-10-27 2005-05-25 Rohde & Schwarz Gmbh & Co. Kg Verfahren und Vorrichtung zur Messung von Funkstörpegeln mit Frequenznachführung
US7599304B2 (en) 2006-02-28 2009-10-06 Microsoft Corporation Testing a station's response to non-compliant wireless communication
US7346477B2 (en) * 2006-02-28 2008-03-18 Microsoft Corporation Testing a station's response to a reduction in wireless signal strength

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2191660A (en) * 1986-06-14 1987-12-16 Marconi Instruments Ltd Measuring adjacent channel power of a radio transmission
US4890332A (en) * 1985-06-29 1989-12-26 Oki Electric Industry Co., Ltd. Apparatus for judging quality of mobile data communication

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU597035B2 (en) * 1986-03-07 1990-05-24 Nec Corporation Mobile receiver unit having function for providing information of electric field intensity
US5175880A (en) * 1988-11-03 1992-12-29 Rolls-Royce Plc Signal analysis
DE4226346A1 (de) * 1992-08-08 1994-02-10 Philips Patentverwaltung Schaltungsanordnung zur Bestimmung der Feldstärke von FM-Sendern

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4890332A (en) * 1985-06-29 1989-12-26 Oki Electric Industry Co., Ltd. Apparatus for judging quality of mobile data communication
GB2191660A (en) * 1986-06-14 1987-12-16 Marconi Instruments Ltd Measuring adjacent channel power of a radio transmission

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114244384A (zh) * 2021-12-20 2022-03-25 浙江嘉科电子有限公司 一种用于零中频接收机的连续波峰值捕获电路及方法
CN114244384B (zh) * 2021-12-20 2023-06-16 浙江嘉科电子有限公司 一种用于零中频接收机的连续波峰值捕获电路及方法

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Publication number Publication date
DE4420448C1 (de) 1995-09-14

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