WO2014174748A1 - 無線通信機および無線通信機の制御方法 - Google Patents
無線通信機および無線通信機の制御方法 Download PDFInfo
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- WO2014174748A1 WO2014174748A1 PCT/JP2014/001202 JP2014001202W WO2014174748A1 WO 2014174748 A1 WO2014174748 A1 WO 2014174748A1 JP 2014001202 W JP2014001202 W JP 2014001202W WO 2014174748 A1 WO2014174748 A1 WO 2014174748A1
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- phase
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- phase information
- wireless communication
- information table
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/022—Site diversity; Macro-diversity
- H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0682—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission using phase diversity (e.g. phase sweeping)
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
- H04B7/084—Equal gain combining, only phase adjustments
Definitions
- the present invention relates to a wireless communication device that performs wireless communication using radio waves.
- the present invention relates to communication between fixedly installed wireless communication devices in an environment where there are many multipaths for radio wave propagation.
- the installation position of home appliances capable of wireless communication is not moved so much.
- such home appliances capable of wireless communication are often installed in a room where there are many obstacles such as walls and floors. Because of these obstacles, the propagation path of radio waves to be transmitted and received is multipath. There may be a point where the reception level of the radio wave locally decreases due to fading.
- FIG. 6 is a schematic diagram illustrating an arrangement example of transmitters installed in a multipath environment and receivers installed on a circumference having the same distance from the transmitter. Moreover, FIG. 6 is a figure which shows an example of the result of having measured the electric field strength in the some point on the circumference shown in FIG.
- the horizontal axis is the point on the circumference
- the vertical axis is the radio wave reception level, and the correspondence between the two is shown.
- FIG. 7 is a probability distribution diagram showing an example of the relationship between the reception level and the probability that a wireless communication device exists at the position of the reception level. In FIG. 7, it is assumed that the radio wave attenuation is large due to reflection by a wall or the like, and the radio wave reception level follows the Rayleigh distribution.
- a wireless terminal such as a mobile phone that is carried and used changes its communication environment as it moves
- the reception level is unlikely to remain at a local level drop point for a long time.
- a wireless terminal that does not assume movement such as a home appliance capable of wireless communication
- a change in the communication environment is poor, and thus the reception level may continue to drop for a long time.
- the selection diversity method a plurality of antennas are used. However, since only one of the plurality of antennas is used after the antenna is selected, the antenna gain is different from the configuration that does not employ the selection diversity method. Absent. In addition, since there is a certain probability that the reception level of any of the plurality of antennas has dropped at the same time, the drop may not be sufficiently avoided.
- this maximum ratio combining diversity method that combines (combines) the same radio signals received by multiple antennas to remove (reduce) noise. It has been proposed to solve the problem (for example, see Patent Document 1).
- the synthesizing circuit disclosed in Patent Document 1 weights the input received wave with the amplitude of the input received wave and the reciprocal of the noise power, and a plurality of received wave weighting means corresponding to each antenna. And a synthesis processing unit that synthesizes the outputs of the received wave weighting means.
- the conventional technique such as Patent Document 1 has a problem that the circuit configuration becomes large.
- the synthesis circuit disclosed in Patent Document 1 includes a reception circuit and a demodulation processing circuit (for example, an envelope estimation unit, a residual power calculation unit, a complex multiplication unit, a multiplication unit, and a synthesis unit for each antenna. ).
- a demodulation processing circuit for example, an envelope estimation unit, a residual power calculation unit, a complex multiplication unit, a multiplication unit, and a synthesis unit for each antenna.
- wireless communication devices built in home appliances and the like are required to be small in size, simplified in circuit configuration, and low in power consumption. It is difficult to reduce the size of the configuration provided.
- the present invention has been made in view of the above-described problems, and an object of the present invention is to increase the apparatus configuration when wireless communication is performed to control a plurality of home appliances to which a wireless communication device is fixed in a room.
- the circuit configuration is simplified and the power consumption is reduced while realizing miniaturization, thereby realizing stable communication.
- a wireless communication device includes a first antenna, a second antenna, and a variable that changes a phase of a high-frequency signal received or transmitted via the first antenna and the second antenna.
- the phase of the high-frequency signal is changed based on the phase information stored in the phase information table in association with the one communication terminal.
- FIG. 1 It is a block diagram which shows an example of schematic structure of the radio
- A is a figure which shows an example of a structure of the phase information table with which the radio
- B is a structure of the phase information table with which the radio
- C is a figure which shows another example of a structure of the phase information table with which the radio
- a wireless communication device includes a first antenna, a second antenna, and a variable that changes a phase of a high-frequency signal received or transmitted via the first antenna and the second antenna.
- the phase of the high-frequency signal is changed based on the phase information stored in the phase information table in association with the one communication terminal.
- This provides a configuration for stable communication in a multipath environment.
- the phase information table includes information on a plurality of phase values for each of the communication terminals.
- This provides a configuration for stable communication even when the multipath environment changes.
- the phase information table has information on a phase change width corresponding to each of the communication terminals.
- This provides a configuration for stable communication even when the multipath environment changes with a small phase information table.
- a method for controlling a wireless communication device comprising: a first antenna; a second antenna; and a phase of a high-frequency signal received or transmitted via the first antenna and the second antenna.
- a variable phase shifter that changes the phase
- a storage unit that stores a phase information table in which phase information is associated for each of a plurality of communication terminals that are communication partners, and a control unit that changes the phase of the variable phase shifter.
- a method of controlling a wireless communication device comprising: changing a phase of the variable phase shift unit every time a predetermined signal transmitted by the communication terminal is received; and at the variable phase shift unit when the predetermined signal is received Storing the changed phase and the reception level of the signal; and phase information representing the phase changed by the variable phase shifter when the reception level is the highest among the stored reception levels. Affection And storing in a table, it is carried out.
- stable communication can be performed in a multipath environment.
- FIG. 1 is a block diagram illustrating an example of a configuration of a wireless communication device according to the first embodiment.
- the wireless communication device includes a first antenna 1, a second antenna 2, a variable phase shift unit 3, a synthesis unit 4, a data control unit 5, a transmission unit 7, and a reception unit 6.
- the high frequency signal received by the first antenna 1 is input to the variable phase shift unit 3 and is input from the variable phase shift unit 3 to the combining unit 4 as the first high frequency signal.
- the high frequency signal received by the second antenna 2 is input to the synthesis unit 4 as the second high frequency signal. Then, the synthesis unit 4 adds and synthesizes the first high-frequency signal and the second high-frequency signal, and inputs the resultant signal to the reception unit 6 as a reception signal.
- the receiving unit 6 demodulates the received signal to generate demodulated data, calculates the received power level, and transmits it to the data control unit 5.
- the data control unit 5 transmits the demodulated data from the reception unit 6 to the external device 9 and receives transmission data from the external device 9.
- the data control unit 5 transmits transmission data to the transmission unit 7, and the transmission unit 7 generates modulation data.
- the transmission unit 7 outputs the generated modulation data to the synthesis unit 4 contrary to the reception state, and outputs high-frequency signals from the first antenna 1 and the second antenna 2.
- the data control unit 5 reads the phase information from the phase information table storage unit 8 so that the phase of the high-frequency signal passing through the variable phase shift unit 3 becomes the value of the phase information read from the phase information table storage unit 8.
- the phase information of the variable phase shifter 3 stored in the phase information table is extracted with conditions suitable for communicating with each home appliance in a good state in an environment where multipath exists.
- FIG. 2A is an example of a phase information table stored in the phase information table storage unit 8 and shows a phase information table of a wireless communication device that communicates with five home appliances.
- the phase information table has phase information corresponding to each home appliance (home appliances 1 to 5).
- the phase information ⁇ 1 corresponding to the home appliance 1 in the phase information table is stored in advance.
- the wireless communication device can maintain a good communication state with the home appliance 1.
- the phase information table is acquired by the flow shown in FIG.
- the data controller 5 sets the phase of the variable phase shifter 3 to an initial value (step 301). This initial value is 0 °.
- the home appliance n that has received the test start signal transmits the test signal to the wireless communication device, and the wireless communication device receives the test signal (step 303).
- the receiving unit 6 receives the test signal, discriminates the noise and the test signal from the synchronization header of the test signal, and measures the received power level (step 304).
- the configuration of the test signal is as shown in FIG.
- the test signal includes a synchronization header, a physical layer header, and a physical layer data / MAC frame.
- the data control unit 5 stores the value of the set value set in the variable phase shift unit 3 and the received power level measured in step 304 in a memory (not shown) (step 305).
- the receiving unit 6 if the receiving unit 6 cannot detect the test signal synchronization header and cannot determine the test signal, the receiving unit 6 transmits the received power level to the data control unit 5 as zero.
- step 306 changes the set value of the variable phase shift unit 3 by a certain amount (step 306), determines whether or not the set value of the variable phase shift unit 3 exceeds 360 ° (step 307), While the set value does not exceed 360 ° (step 307, Yes), step 302 is executed.
- step 307, No When the set value of the variable phase shifter 3 exceeds 360 ° (step 307, No), the set value of the variable phase shifter 3 at the highest received level among the received power levels stored in the memory is phase information. Store in the table (step 308). In this way, it is possible to extract the best phase condition between the wireless communication device and the home appliance n. Note that step 301 to step 308 are respectively performed for all home appliances (all n), whereby FIG. 2A can be obtained.
- phase information candidates for each home appliance as shown in FIG. 2 (B) or FIG. 2 (C).
- 2B shows not only the setting value (phase information 1) of the variable phase shifter 3 when the reception level is the highest in step 308 of FIG. 3, but also the second (phase information 2) and the third (phase information 3).
- phase information 1 phase information 1
- phase information 2 phase information 2
- phase information 3 phase information 3
- phase condition ⁇ 11 having the highest reception level
- a communication error for example, a reception confirmation signal does not arrive from the home appliance that is the transmission destination
- FIG. 2C shows a configuration in which the phase information 2 and the phase information 3 are not shown as absolute values as shown in FIG. 2B but as relative values.
- the variable phase shifter 3 is changed by, for example, an integral multiple of d ⁇ 1.
- the phase difference information is renewed. There is no need to get. For example, as this phase difference information, it is useful to set information equivalent to changing the phase of the variable phase shifter 3 by 45 degrees.
- variable phase shifter 3 may be provided not only on one side of the first antenna and the second antenna but also on both sides.
- the phase information table storage unit 8 has phase information tables corresponding to both variable phase shift units, and the set values of the respective phase information tables are extracted according to the steps of FIG.
- the timing at which the data control unit 5 acquires the phase information table from the phase information table storage unit 8 is periodically provided with a timer (not shown) provided in the wireless transmitter.
- a timer not shown
- the process shown in FIG. 3 is performed every night (for example, 1:00 am) to acquire or update the phase information table. If it is once a day, it is more effective in power saving than updating the phase information table frequently.
- the radio wave propagation environment differs between daytime and nighttime, a different phase information table is acquired during daytime and nighttime, and a phase information table corresponding to each time zone is used in each time zone, so that a more individual radio wave propagation environment is achieved. Accordingly, the phase information table is appropriately set, and stable communication is possible.
- the wireless communication apparatus can perform stable communication with a small and simple configuration and avoiding a local drop in reception level due to fading in a multipath propagation environment. For this reason, it is useful for a wireless communication device fixedly installed in a multipath propagation environment.
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Abstract
Description
図1は、本実施の形態1に係る無線通信機の構成の一例を示すブロック図である。図1において示すように、無線通信機は、第1のアンテナ1、第2のアンテナ2、可変移相部3、合成部4、データ制御部5、送信部7、受信部6を備える。受信状態では、第1のアンテナ1で受信した高周波信号は可変移相部3に入力され、この可変移相部3から第1の高周波信号として合成部4に入力される。
Claims (4)
- 第1のアンテナと、
第2のアンテナと、
前記第1のアンテナと前記第2のアンテナを介して受信または送信する高周波信号の位相を変化させる可変移相部と、
通信相手である複数の通信端末ごとに位相情報を対応付けた位相情報テーブルを記憶する記憶部とを備え、
前記可変移相部は、前記第1のアンテナと前記第2のアンテナを介して前記複数の通信端末のうち1の通信端末と通信するときに、前記1の通信端末に対応付けて位相情報テーブルに記憶された位相情報に基づいて高周波信号の位相を変化させる無線通信機。 - 前記位相情報テーブルは、前記通信端末の各々に対して複数の位相値の情報を有する、
請求項1記載の無線通信機。 - 前記位相情報テーブルは、前記通信端末の各々に対応した位相変化幅の情報を有する、
請求項1記載の無線通信機。 - 第1のアンテナと、第2のアンテナと、前記第1のアンテナと前記第2のアンテナを介して受信または送信する高周波信号の位相を変化させる可変移相部と、通信相手である複数の通信端末ごとに位相情報を対応付けた位相情報テーブルを記憶する記憶部と、前記可変移相部の位相を変化させる制御部とを備える無線通信機の制御方法であって、
前記通信端末が送信する所定信号を受信するたびに前記可変移相部の位相を変化させるステップと、
前記所定信号を受信したときの前記可変移相部で変化させた位相と、前記信号の受信レベルとを記憶するステップと、
前記記憶した受信レベルの中から最も受信レベルが高いときの前記可変移相部で変化させた位相を表す位相情報を前記位相情報テーブルに格納するステップと、
を行う無線通信機の制御方法。
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CN201480001985.8A CN104541457A (zh) | 2013-04-25 | 2014-03-05 | 无线通信机及无线通信机的控制方法 |
US14/416,242 US9538399B2 (en) | 2013-04-25 | 2014-03-05 | Wireless communication apparatus and method for controlling wireless communication apparatus |
JP2015513503A JPWO2014174748A1 (ja) | 2013-04-25 | 2014-03-05 | 無線通信機および無線通信機の制御方法 |
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Citations (3)
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JPH05300059A (ja) * | 1992-04-22 | 1993-11-12 | Nec Corp | 送信スペースダイバーシチ方式 |
JPH07123038A (ja) * | 1993-10-20 | 1995-05-12 | Fujitsu Ltd | スペースダイバーシチ同相合成回路 |
JP2000332666A (ja) * | 1999-05-24 | 2000-11-30 | Toshiba Tec Corp | 無線通信システム |
Family Cites Families (11)
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JPH10224281A (ja) | 1997-02-12 | 1998-08-21 | Oki Electric Ind Co Ltd | ダイバーシチ合成回路 |
JP3552622B2 (ja) * | 1999-12-24 | 2004-08-11 | 日本電気株式会社 | Pldを用いた無限移相器およびその調整方法 |
US20030109282A1 (en) * | 2001-12-06 | 2003-06-12 | Itzhak Shperling | Method and base station for providing phase-shift transmit diversity |
JP3998578B2 (ja) * | 2003-01-09 | 2007-10-31 | 株式会社東芝 | 移動通信システムおよび移動通信方法 |
JP4396556B2 (ja) | 2005-03-22 | 2010-01-13 | パナソニック株式会社 | 面状採暖具 |
JP4858051B2 (ja) | 2006-09-29 | 2012-01-18 | ブラザー工業株式会社 | 無線受信装置、無線タグ通信装置、及び無線受信装置の補正方法 |
JP4539891B2 (ja) * | 2008-08-11 | 2010-09-08 | 岩崎通信機株式会社 | マルチアンテナを用いた無線通信方法、無線通信システムおよび無線通信装置 |
JP5381150B2 (ja) * | 2009-02-23 | 2014-01-08 | パナソニック株式会社 | ダイバーシティアンテナ装置と、これを用いた電子機器 |
CN102148633A (zh) * | 2010-02-05 | 2011-08-10 | 松下电器产业株式会社 | 一种利用分集天线降低接收噪声的无线接收装置和方法 |
JP5884059B2 (ja) * | 2010-07-16 | 2016-03-15 | パナソニックIpマネジメント株式会社 | レーダ装置 |
JP5799271B2 (ja) * | 2010-09-30 | 2015-10-21 | パナソニックIpマネジメント株式会社 | 無線通信機 |
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2014
- 2014-03-05 JP JP2015513503A patent/JPWO2014174748A1/ja active Pending
- 2014-03-05 WO PCT/JP2014/001202 patent/WO2014174748A1/ja active Application Filing
- 2014-03-05 US US14/416,242 patent/US9538399B2/en not_active Expired - Fee Related
- 2014-03-05 CN CN201480001985.8A patent/CN104541457A/zh active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH05300059A (ja) * | 1992-04-22 | 1993-11-12 | Nec Corp | 送信スペースダイバーシチ方式 |
JPH07123038A (ja) * | 1993-10-20 | 1995-05-12 | Fujitsu Ltd | スペースダイバーシチ同相合成回路 |
JP2000332666A (ja) * | 1999-05-24 | 2000-11-30 | Toshiba Tec Corp | 無線通信システム |
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US9538399B2 (en) | 2017-01-03 |
US20150208252A1 (en) | 2015-07-23 |
JPWO2014174748A1 (ja) | 2017-02-23 |
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