WO2020149054A1 - Dispositif de réception de signal pour la détection de la position, système de détection de la position et procédé de détection de l'intensité de la réception pour la détection de la position - Google Patents

Dispositif de réception de signal pour la détection de la position, système de détection de la position et procédé de détection de l'intensité de la réception pour la détection de la position Download PDF

Info

Publication number
WO2020149054A1
WO2020149054A1 PCT/JP2019/048454 JP2019048454W WO2020149054A1 WO 2020149054 A1 WO2020149054 A1 WO 2020149054A1 JP 2019048454 W JP2019048454 W JP 2019048454W WO 2020149054 A1 WO2020149054 A1 WO 2020149054A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal
reception
position detection
receiver
reception strength
Prior art date
Application number
PCT/JP2019/048454
Other languages
English (en)
Japanese (ja)
Inventor
卓也 木寺
西村　哲
隆之 堀邉
Original Assignee
株式会社村田製作所
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 株式会社村田製作所 filed Critical 株式会社村田製作所
Publication of WO2020149054A1 publication Critical patent/WO2020149054A1/fr

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves

Definitions

  • the present invention relates to a position detection signal receiving device that receives a signal for detecting the position of a transmitter, a position detection system, and a position detection reception strength detection method that detects the strength of a received signal.
  • Patent Document 1 describes a system for managing the position of a moving body.
  • the position management system described in Patent Document 1 includes a plurality of receivers.
  • the plurality of receivers are arranged at different positions.
  • the mobile unit is equipped with a transmitter that transmits a beacon.
  • the -Multiple receivers receive the beacon transmitted from the transmitter, demodulate the transmitter ID, and measure the reception strength.
  • the plurality of receivers outputs the transmitter ID and the average value of the reception intensity to the management server.
  • the management server estimates the position of the transmitter using the average value of the reception intensities of the plurality of receivers.
  • an object of the present invention is to provide a signal receiving device for position detection, a position detection system, and a reception intensity detection method for position detection that can improve the estimation accuracy of the position of a transmitter (transmitter). ..
  • a signal receiving device for position detection includes a receiving unit and a detection result generating unit.
  • the receiving unit receives a plurality of wireless signals transmitted from a transmitter and measures the reception intensity of each wireless signal.
  • the detection result generation unit calculates the statistical calculation value related to the maximum value of the reception strength by using the reception strengths of a plurality of times, and generates the calculated result as the detection result of the reception strength.
  • the statistical average value related to the maximum value (maximum value as an example) is used instead of using the simple average value of the reception strength. As a result, the influence of the change in the reception environment on the detection result is suppressed.
  • the accuracy of estimating the position of the transmitter (transmitter) can be improved.
  • FIG. 1 is a functional block diagram showing the configuration of the position detection system 10 according to the first embodiment.
  • FIG. 2 is a functional block diagram showing the configuration of the transmitter 20 according to the first embodiment.
  • FIG. 3 is a functional block diagram showing the configuration of the receiver 11 according to the first embodiment.
  • FIG. 4A and FIG. 4B are tables for explaining the first concept of the reception strength detection result.
  • FIG. 5(A) is a table for explaining the second concept of the reception strength detection result
  • FIG. 5(B) is a table for explaining the third concept of the reception strength detection result.
  • FIG. 6(A) is a flow chart showing a reception intensity measurement flow
  • FIG. 6(B) is a flow chart showing a first detection result calculation flow
  • FIG. 6(C) is a detection result first flow.
  • FIG. 7 is a functional block diagram showing the configuration of the position detection system according to the second embodiment.
  • FIG. 8 is a diagram showing an example of a timing chart for switching an advertising signal and a reception channel of a receiver according to the second embodiment.
  • FIG. 1 is a functional block diagram showing the configuration of the position detection system according to the first embodiment.
  • FIG. 2 is a functional block diagram showing the configuration of the transmitter according to the first embodiment.
  • FIG. 3 is a functional block diagram showing the configuration of the receiver according to the first embodiment.
  • the position detection system 10 includes a receiver 11, a receiver 12, a transmitter 20, and a server device 30.
  • the receiver 11 and the receiver 12 are features that correspond to the "signal receiving device for position detection" according to this invention.
  • the receiver 11 and the receiver 12 have the same function and the same configuration.
  • the arrangement position of the receiver 11 and the arrangement position of the receiver 12 are separated from each other. In other words, the receiver 11 and the receiver 12 are arranged at different positions.
  • the position detection system 10 includes two receivers, the receiver 11 and the receiver 12, but may include three or more receivers. The multiple receivers have the same function and the same configuration.
  • the receiver 11 and the receiver 12 are connected to the server device 30 via a network.
  • the network may be a wireless communication network or a wired communication network. Further, the receiver 11 and the receiver 12 have a function of performing wireless communication with the transmitter 20.
  • the transmitter 20 is movable.
  • the transmitter 20 may be mounted on a moving body or may have a shape that can be moved by a person or the like.
  • the transmitter 20 has a function of performing wireless communication with the receiver 11 and the receiver 12.
  • Wireless communication with the transmitter 20, the receiver 11, and the receiver 12 is based on, for example, the BLUETOOTH LOW ENERGY (BLE) (registered trademark) standard.
  • BLE BLUETOOTH LOW ENERGY
  • the transmitter 20 transmits an advertising signal at a predetermined time interval.
  • the advertising signal corresponds to the communication establishment signal in the wireless signal of the present invention.
  • the receiver 11 and the receiver 12 receive the advertising signal and measure the signal strength each time. In other words, the receiver 11 and the receiver 12 receive the advertising signal a plurality of times and measure the signal strength at each time.
  • Each of the receiver 11 and the receiver 12 calculates a statistically calculated value (details will be described later) related to the maximum value by using the signal strength of multiple times.
  • the receiver 11 and the receiver 12 output the calculation result to the server device 30 together with the identification ID of the transmitter 20 as the detection result of the reception strength.
  • the statistical calculation value is calculated such that the shorter the distance between the transmitter 20 and the receiver 11 or the receiver 12, the larger the value.
  • the server device 30 detects the position of the transmitter 20 using the detection result of the reception intensity of the receiver 11 and the detection result of the reception intensity of the receiver 12. Specifically, the server device 30 compares the statistical calculation value of the receiver 11 and the statistical calculation value of the receiver 12 with each other. If the statistical calculation value of the receiver 11 is larger than the statistical calculation value of the receiver 12, the server device 30 detects that the transmitter 20 is located closer to the receiver 11 than the receiver 12. .. On the other hand, the server device 30 determines that the transmitter 20 is located closer to the receiver 12 than the receiver 11 if the statistically calculated value of the receiver 12 is larger than the statistically calculated value of the receiver 11. To detect.
  • the transmitter 20 includes a wireless signal generator 21, a wireless signal transmitter 22, and a function unit 23.
  • the functional unit 23 can be omitted.
  • the wireless signal generation unit 21 generates a wireless signal including the above-mentioned advertising signal and outputs it to the wireless signal transmission unit 22.
  • the advertising signal includes the identification ID of the transmitter 20.
  • the wireless signal generation unit 21 continues to generate and output a wireless signal for a predetermined time length.
  • the radio signal generation unit 21 determines a time length for generating the radio signal so that the advertising signal can be transmitted a plurality of times. Specifically, the radio signal generation unit 21 transmits the radio signals so that the radio signals can be transmitted from different frequency channels (for example, BLE frequency channel CH37, BLE frequency channel CH38, and BLE frequency channel CH39). Determine the length of time to generate. Further, preferably, the radio signal generation unit 21 determines the time length for generating the radio signal so that the advertising signal of each frequency channel can be transmitted a plurality of times.
  • the wireless signal transmission unit 22 transmits (transmits) a wireless signal including an advertising signal to the outside.
  • the functional unit 23 may be configured to include a control system operation switch, or may be a sensor or the like. If the configuration includes the operation switch, the function unit 23 generates a transmission trigger by using an operation input to the operation switch or the like, and gives the transmission trigger to the wireless signal generation unit 21. Further, in the case of a configuration including a sensor, the functional unit 23 generates a transmission trigger and gives it to the wireless signal generation unit 21 when the sensor value becomes a reference value for generating a wireless signal. The wireless signal generator 21 generates a wireless signal starting from this transmission trigger. Note that the wireless signal generation unit 21 may generate the wireless signal steadily at a predetermined time interval without referring to such a transmission trigger.
  • the receiver 11 includes an antenna 101, a reception unit 110, a detection result generation unit 120, a data demodulation unit 130, and an output unit 140.
  • the antenna 101 receives a radio signal from the transmitter 20.
  • the reception unit 110 includes a filter 111, a filter 112, a filter 113, and a reception intensity measurement unit 114.
  • the filter 111, the filter 112, and the filter 113 have different filter characteristics. For example, when using the advertising signals of the BLE frequency channel CH37, the BLE frequency channel CH38, and the BLE frequency channel CH39 described above, the filter 111 sets the frequency band of the frequency channel CH37 within the pass band and sets the frequency channel CH38 and the frequency channel CH39. It has a filter characteristic that the frequency band of is within the attenuation band.
  • the filter 112 has a filter characteristic in which the frequency band of the frequency channel CH38 is in the pass band and the frequency bands of the frequency channel CH37 and the frequency channel CH39 are in the attenuation band.
  • the filter 113 has a filter characteristic in which the frequency band of the frequency channel CH39 is in the pass band and the frequency bands of the frequency channel CH37 and the frequency channel CH38 are in the attenuation band.
  • the filter 111 outputs the advertising signal of the frequency channel CH37.
  • the filter 112 outputs an advertising signal of the frequency channel CH38.
  • the filter 113 outputs an advertising signal of the frequency channel CH39.
  • the reception intensity measuring unit 114 measures the reception intensity of the output signal of the filter 111, that is, the advertising signal of the frequency channel CH37.
  • the reception strength measuring unit 114 measures the reception strength of the output signal of the filter 112, that is, the advertising signal of the frequency channel CH38.
  • the reception strength measuring unit 114 measures the reception strength of the output signal of the filter 113, that is, the advertising signal of the frequency channel CH39.
  • the reception strength is, for example, RSSI.
  • the detection result generation unit 120 uses the reception intensities of a plurality of advertising signals to calculate a statistical calculation value related to the maximum value.
  • the detection result generation unit 120 outputs the statistically calculated value as a detection result to the output unit 140.
  • FIG. 4A and FIG. 4B are tables for explaining the first concept of the reception strength detection result.
  • FIG. 4A shows the reception intensity of the receiver 11 and the detection result
  • FIG. 4B shows the reception intensity of the receiver 12 and the detection result.
  • the detection result generation unit 120 calculates the maximum value of the reception strength of a plurality of advertising signals.
  • the plurality of reception intensities in the receiver 11 are in the range of -70 [dB] to -55 [dB], and the maximum value is -55 [dB].
  • the detection result generation unit 120 generates -55 [dB] as the detection result of the receiver 11 and outputs it.
  • the plurality of reception intensities in the receiver 12 are in the range of ⁇ 65 [dB] to ⁇ 60 [dB], and the maximum value is ⁇ 60 [dB].
  • the detection result generation unit 120 generates ⁇ 60 [dB] as the detection result of the receiver 12 and outputs it.
  • the detection result can reduce the influence of multipath.
  • the variations in the reception intensity of the receiver 12 are small, and in this case, the maximum value is almost the same as a steady value that is not affected by the reception environment.
  • FIG. 5A is a table for explaining the second concept of the reception strength detection result.
  • the detection result generation unit 120 calculates the second largest value in the reception strength of a plurality of advertising signals.
  • the plurality of reception intensities in the receiver 11 are in the range of ⁇ 70 [dB] to ⁇ 53 [dB], and the second largest value is ⁇ 55 [dB]. ..
  • the detection result generation unit 120 generates -55 [dB] as the detection result of the receiver 11 and outputs it.
  • the predetermined number not limited to the second
  • the influence of the reception environment on the detection result can be suppressed.
  • the minimum value is not used for the detection result.
  • FIG. 5B is a table for explaining the third concept of the reception strength detection result.
  • the detection result generation unit 120 calculates an average value of three reception strengths having large reception strengths of a plurality of advertising signals.
  • the plurality of reception intensities in the receiver 11 are in the range of ⁇ 70 [dB] to ⁇ 53 [dB], and the reception intensities of the three large values are ⁇ 53 [dB]. ], ⁇ 55 [dB], ⁇ 59 [dB], and their average value is ⁇ 55.7 [dB].
  • the detection result generation unit 120 generates ⁇ 55.7 [dB] as the detection result of the receiver 11 and outputs it.
  • the influence of the reception environment on the detection result can be suppressed even by using a predetermined number (not limited to three) of average values of the reception strength in descending order of the maximum value.
  • the median value may be used instead of the average value.
  • the data demodulation unit 130 demodulates the identification ID of the transmitter 20 from the advertising signal.
  • the output unit 140 associates the detection result with the identification ID and outputs the result to the server device 30.
  • the server device 30 detects the position of the transmitter 20 using the detection result based on the reception intensity.
  • the receiver 11 and the receiver 12 can generate the detection result of the reception intensity in which the influence of the reception environment is suppressed and output it to the server device 30.
  • the server device 30 can improve the detection accuracy (estimation accuracy) of the position according to the reception intensity.
  • the frequency channels of a plurality of advertising signals are different. Different frequencies of the radio signal have different effects of multipath. Therefore, by measuring the reception intensity in a plurality of frequency channels, it is possible to obtain a detection result in which the influence of multipath is suppressed more reliably. Thereby, the server device 30 can further improve the accuracy of position detection according to the reception intensity.
  • reception strength detection method In the above description, the mode in which the reception strength detection method is realized by each individual functional unit has been shown, but the following reception strength detection method is programmed and stored and stored in an arithmetic processing unit such as a CPU. The program may be read and executed.
  • FIG. 6A is a flowchart showing the flow of measuring the reception strength.
  • FIG. 6B is a flowchart showing the first calculation flow of the detection result.
  • FIG. 6C is a flowchart showing the second calculation flow of the detection result. Since the specific contents of each process have been described above, a detailed description of each process will be omitted.
  • the arithmetic processing device receives a radio signal including an advertising signal (S11).
  • the arithmetic processing unit measures the reception intensity of the wireless signal (S12).
  • the arithmetic processing unit If these processes have not been executed M times (S13: NO), the arithmetic processing unit repeatedly receives the radio signal and measures the reception intensity. If the arithmetic processing unit executes these processes M times (S13: YES), it ends the measurement process. At this time, the arithmetic processing unit stores the reception intensity of each time.
  • M is a preset positive integer and can be set as appropriate.
  • the arithmetic processing device calculates the maximum value of the reception intensity of M times (S21).
  • the arithmetic processing unit outputs the maximum value as the detection result (S22).
  • the arithmetic processing unit calculates the statistical arithmetic value related to the maximum value by using the reception intensity of M times (S31).
  • the statistically calculated value related to the maximum value is the above-mentioned second largest reception strength, the average value of the three largest reception strengths, and the like.
  • the arithmetic processing unit outputs a statistically calculated value as a detection result (S32).
  • FIG. 7 is a functional block diagram showing the configuration of the position detection system according to the second embodiment.
  • a receiver 11A which is a signal receiving device for position detection according to the second embodiment, differs from the receiver 11 according to the first embodiment in the configuration of a receiving unit 110A.
  • the other configuration of the receiver 11A is the same as that of the receiver 11, and the description of the same portions will be omitted.
  • the band variable filter 115 is a filter whose filter characteristics can be switched.
  • the band variable filter 115 switches between the first filter characteristic, the second filter characteristic, and the third filter characteristic.
  • the first filter characteristic is a characteristic in which the frequency band of the frequency channel CH37 is within the pass band and the frequency bands of the frequency channels CH38 and CH39 are within the attenuation band.
  • the second filter characteristic is a characteristic in which the frequency band of the frequency channel CH38 is within the pass band and the frequency bands of the frequency channels CH37 and CH39 are within the attenuation band.
  • the third filter characteristic has a characteristic that the frequency band of the frequency channel CH39 is within the pass band and the frequency band of the frequency channel CH37 and the frequency channel CH38 is within the attenuation band.
  • FIG. 8 is a diagram showing an example of a timing chart for switching an advertising signal and a reception channel of a receiver according to the second embodiment.
  • the transmitter 20 repeatedly transmits an advertising signal at a transmission cycle Itx. Specifically, the transmitter 20 sequentially transmits the advertising signal of the frequency channel CH37, the advertising signal of the frequency channel CH38, and the advertising signal of the frequency channel CH39 at predetermined intervals (intervals shorter than the transmission cycle Itx). Further, the transmitter 20 transmits so that the transmitting intervals of the advertising signals of the same channel adjacent to each other on the time axis become Itx.
  • the receiver 11A receives the advertising signal while switching the reception channel at the reception switching cycle Irx.
  • the reception switching cycle Irx is the same as the transmission cycle Itx.
  • the receiver 11A sets the reception channel to the frequency channel CH37 over a reception period Prx starting from a certain time (time).
  • the reception period Prx is shorter than the reception switching period Irx.
  • the reception period Prx is longer than the time length (transmission period ⁇ ta) at which the group of advertising signals of the frequency channel CH37, the advertising signal of the frequency channel CH38, and the group of advertising signals of the frequency channel CH39 are transmitted.
  • the receiver 11A sets the reception channel to the frequency channel CH38 after the reception switching cycle Irx from the setting start timing of the frequency channel CH37.
  • the reception period Prx of this frequency channel CH38 is the same as that of the frequency channel CH37.
  • the receiver 11A sets the reception channel to the frequency channel CH39 after the reception switching cycle Irx from the setting start timing of the frequency channel CH38.
  • the reception period Prx of the frequency channel CH39 is the same as that of the frequency channel CH37 and the frequency channel CH38. Then, the receiver 11A returns the reception channel to the frequency channel CH37 again, and repeats the above processing.
  • the switching of the receiving channel is realized by switching the filter characteristic using the band variable filter 115 described above.
  • the receiver 11A receives the advertising signal of the frequency channel CH37 and measures the reception strength when the reception channel is the frequency channel CH37.
  • the receiver 11A receives the advertising signal of the frequency channel CH38 and measures the reception intensity. Further, the receiver 11A receives the advertising signal of the frequency channel CH39 and measures the reception intensity when the reception channel is the frequency channel CH39.
  • the receiver 11A can more reliably receive the advertising signal of any frequency channel and measure the reception strength. Further, the frequency channels are sequentially switched, so that the receiver 11A can receive the advertising signals of the plurality of frequency channels in a shorter time and measure the reception intensity.
  • the configuration of the receiver 11A is simplified and the receiver 11A can be downsized.
  • the transmission period ⁇ ta of the plurality of advertising signals is extremely short compared to the reception period Prx, so that the receiver 11A can receive the advertising signals of the plurality of frequency channels without synchronization.
  • advertising signals of a plurality of frequency channels are transmitted and received in time division.
  • the receiver 11 and the receiver 12 simultaneously and individually transmit the advertising signals of a plurality of frequency channels.
  • the reception intensity can be measured by receiving the signal.
  • BLE is taken as an example, but the configuration of this embodiment can be applied to other wireless communication systems.
  • the number of the advertising signals that is, the signals for establishing communication is three is shown, the number of the signals for establishing communication is not limited to this, and it is sufficient that the reception intensity can be measured at least a plurality of times.
  • the influence of multipath is suppressed, which is better.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Position Fixing By Use Of Radio Waves (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Un récepteur (11) comprend une unité de réception (110) et une unité de génération de résultat de détection (120). L'unité de réception (110) reçoit, à de multiples reprises, un signal sans fil transmis par un émetteur (20), et mesure l'intensité de réception de chaque signal sans fil. L'unité de génération de résultat de détection (120) utilise la pluralité d'intensités de réception pour calculer une valeur de calcul statistique liée à la valeur maximale des intensités de réception, et génère le résultat calculé en tant que résultat de détection des intensités de réception.
PCT/JP2019/048454 2019-01-16 2019-12-11 Dispositif de réception de signal pour la détection de la position, système de détection de la position et procédé de détection de l'intensité de la réception pour la détection de la position WO2020149054A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019005340 2019-01-16
JP2019-005340 2019-01-16

Publications (1)

Publication Number Publication Date
WO2020149054A1 true WO2020149054A1 (fr) 2020-07-23

Family

ID=71613745

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2019/048454 WO2020149054A1 (fr) 2019-01-16 2019-12-11 Dispositif de réception de signal pour la détection de la position, système de détection de la position et procédé de détection de l'intensité de la réception pour la détection de la position

Country Status (1)

Country Link
WO (1) WO2020149054A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150031387A1 (en) * 2013-07-26 2015-01-29 Texas Instruments Incorporated Compensation of the signal attenuation by human body in indoor wi-fi positioning
JP2016144064A (ja) * 2015-02-03 2016-08-08 Kddi株式会社 無線通信装置、無線通信方法、及び、コンピュータプログラム
JP2016217943A (ja) * 2015-05-22 2016-12-22 ダイキン工業株式会社 位置推定システム
JP2017181165A (ja) * 2016-03-29 2017-10-05 公立大学法人岩手県立大学 データ補正システム、データ補正方法、プログラム
WO2018008402A1 (fr) * 2016-07-04 2018-01-11 株式会社村田製作所 Système de détection de position et récepteur

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150031387A1 (en) * 2013-07-26 2015-01-29 Texas Instruments Incorporated Compensation of the signal attenuation by human body in indoor wi-fi positioning
JP2016144064A (ja) * 2015-02-03 2016-08-08 Kddi株式会社 無線通信装置、無線通信方法、及び、コンピュータプログラム
JP2016217943A (ja) * 2015-05-22 2016-12-22 ダイキン工業株式会社 位置推定システム
JP2017181165A (ja) * 2016-03-29 2017-10-05 公立大学法人岩手県立大学 データ補正システム、データ補正方法、プログラム
WO2018008402A1 (fr) * 2016-07-04 2018-01-11 株式会社村田製作所 Système de détection de position et récepteur

Similar Documents

Publication Publication Date Title
JP5438196B2 (ja) 遠隔通信装置の間の見通し線（ｌｏｓ）距離を判定する方法
DK174844B1 (da) Spredtspektrum -system og -fremgangsmåde med faset antennesystem.
KR100841988B1 (ko) 비동기 통신 시스템에서 충돌들을 감소시키는 방법 및시스템
CA3038591A1 (fr) Localisation basee sur une division de telegrammes
EP1488532B1 (fr) Procede et appareil permettant de mettre en oeuvre des antennes intelligentes et des techniques de diversite
EP3375227B1 (fr) Récepteur multi-radio concurrent
KR100934832B1 (ko) 이동체 통신 시스템, 이동체 통신 시스템에 있어서의 이동단말, 그 제어 프로그램 및 이동체 통신 시스템에 있어서의동기 확립 판정 방법
US8189715B2 (en) Receiver for receiving data symbols having a symbol period
JP2017028373A (ja) 無線通信装置
JP4224099B2 (ja) 無線通信装置およびシステム
CN107852380B (zh) 多信道可监听接收器及其操作方法
WO2020149054A1 (fr) Dispositif de réception de signal pour la détection de la position, système de détection de la position et procédé de détection de l'intensité de la réception pour la détection de la position
EP2127163B1 (fr) Procédé et dispositif de repérage d'imperfections dans un trajet radiofréquence
Qin et al. Towards accurate and agile link quality estimation in wireless sensor networks
EP1562300A1 (fr) Dispositif et méthode de contrôle de la détermination de la synchronisation
JP2014169908A (ja) 監視システム、監視用子機、監視用親機、監視方法および監視プログラム
US20130329706A1 (en) Preventing interference between a first modem (e.g. dect) located in proximity to a radio modem operating in a tdm mode (e.g. gsm)
KR100667785B1 (ko) 카오스 기반 통신 시스템에서 동기화 방법 및 장치, 위치인식 방법 및 장치
JP2013250731A (ja) 自動検針システム、携帯端末および携帯端末の無線通信方法
KR20120056641A (ko) 이기종 통신 시스템 검출 방법 및 장치
US8611474B2 (en) System and method for detecting and processing received signal with pulse sequence
KR20050107220A (ko) Ｔｄｄ 방식의 중계기에서 상하향링크 비율 절체 방법
KR20160081746A (ko) 빔 선택 장치 및 빔 선택 방법
JP2013072756A (ja) 侵入検知システム、侵入検知用子機、侵入検知用親機、侵入検知方法および侵入検知プログラム
WO2014175738A1 (fr) Localisation rss fondée sur l'espace

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 19910764

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 19910764

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: JP