WO2014034068A1 - 無線通信装置 - Google Patents

無線通信装置 Download PDF

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Publication number
WO2014034068A1
WO2014034068A1 PCT/JP2013/004992 JP2013004992W WO2014034068A1 WO 2014034068 A1 WO2014034068 A1 WO 2014034068A1 JP 2013004992 W JP2013004992 W JP 2013004992W WO 2014034068 A1 WO2014034068 A1 WO 2014034068A1
Authority
WO
WIPO (PCT)
Prior art keywords
phase shift
vehicle
shift amount
antennas
phase
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2013/004992
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
鈴木　忠男
杉本　勇次
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Denso Corp
Soken Inc
Original Assignee
Denso Corp
Nippon Soken Inc
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 Denso Corp, Nippon Soken Inc filed Critical Denso Corp
Priority to US14/425,285 priority Critical patent/US9356812B2/en
Priority to DE112013004323.8T priority patent/DE112013004323T5/de
Publication of WO2014034068A1 publication Critical patent/WO2014034068A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/26—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/27—Adaptation for use in or on movable bodies
    • H01Q1/32—Adaptation for use in or on road or rail vehicles
    • H01Q1/325—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle
    • H01Q1/3275—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle mounted on a horizontal surface of the vehicle, e.g. on roof, hood, trunk
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/28—Combinations of substantially independent non-interacting antenna units or systems
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
    • H03F3/24—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • 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
    • 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
    • H04B7/0615—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 of weighted versions of same signal
    • H04B7/0617—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 of weighted versions of same signal for beam forming
    • 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
    • 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
    • H04B7/10—Polarisation diversity; Directional diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H04B2001/0408—Circuits with power amplifiers

Definitions

  • the present disclosure relates to a wireless communication apparatus that performs transmission and reception wirelessly, and particularly relates to a wireless communication apparatus that can perform reception diversity.
  • a wireless communication device capable of performing reception diversity is widely known (for example, Patent Document 1).
  • the wireless communication device disclosed in Patent Document 1 includes two antenna elements. By switching which of the two antenna elements is used for reception by a changeover switch, directivity of the entire antenna is set. Changing sex.
  • the present disclosure has been made based on this situation, and an object of the present disclosure is to improve transmission performance in a wireless communication apparatus capable of performing reception diversity.
  • the wireless communication apparatus includes a plurality of antennas, and performs reception diversity using the plurality of antennas.
  • the wireless communication device is disposed in a transmission line, a transmission line connecting the plurality of antennas and the transmission unit, and distributes a signal output from the transmission unit to the plurality of antennas during transmission, and the distribution And a phase shifter provided on at least one of the plurality of transmission lines connecting the plurality of antennas and the plurality of antennas, respectively.
  • a distributor that connects the transmission unit to a plurality of antennas is provided, and transmission is performed using a plurality of antennas used when performing reception diversity.
  • a phase shifter is provided in at least one of the plurality of transmission lines that respectively connect the distributor and the plurality of antennas. Since the combined directivity can be changed by adjusting the amount of phase shift of this phase shifter, it is possible to obtain appropriate directivity according to the angle of the installation state or the like. Therefore, transmission performance is improved.
  • FIG. 1 is a partial cross-sectional view of a vehicle wireless communication device 1 mounted on a vehicle roof 2.
  • FIG. 3 is a result of simulating the directivity of the antenna 110A in the horizontal plane (XY plane) in the configuration shown in FIG. 3 is a result of simulating the directivity of the antenna 110B in the horizontal plane (XY plane) in the configuration shown in FIG.
  • the vehicle wireless communication device 1 of FIG. 1 includes an antenna module 100 and an ECU 200, and is a wireless communication device that performs vehicle-to-vehicle communication and / or road-to-vehicle communication.
  • a 5.9 GHz band is used as a communication frequency for vehicle-to-vehicle communication and road-to-vehicle communication.
  • the antenna module 100 includes two antennas 110A and 110B, three switching circuits 120A, 120B, and 120C, a distributor 130, a phase shifter 140, and two low-noise amplifiers 150A and 150B as a configuration for vehicle-to-vehicle communication and road-to-vehicle communication.
  • a power amplifier 160 is provided.
  • the antenna module 100 includes a GNSS (Global Navigation Satellite Systems) antenna 170, a low noise amplifier 180, and a cellular phone line antenna 190.
  • the GNSS antenna 170 is connected to a low noise amplifier 180, and the low noise amplifier 180 is connected to the coaxial cable 30.
  • the telephone line antenna 190 is connected to the coaxial cable 40.
  • the two antennas 110A and 110B are used for both reception and transmission. At the time of reception, the antenna 110A and the low noise amplifier 150A are connected by the switching circuit 120A.
  • the low noise amplifier 150 ⁇ / b> A is connected to the ECU 200 by the coaxial cable 10.
  • the antenna 110B and the low noise amplifier 150B are connected by the switching circuit 120B.
  • the low noise amplifier 150B is connected to the coaxial cable 20 by the switching circuit 120C. Therefore, two antennas 110A and 110B are used during reception. Note that the connection positions of the switching circuits 120A, 120B, and 120C are switched by an antenna switching switch 240 provided in the ECU 200.
  • the switching circuit 120C connects the coaxial cable 20 and the power amplifier 160.
  • the power amplifier 160 is connected to the distributor 130.
  • the distributor 130 distributes the signal input from the power amplifier 160 to the antenna 110A and the antenna 110B.
  • Switching circuit 120A is located between distributor 130 and antenna 110A, and switching circuit 120A connects distributor 130 and antenna 110A during transmission.
  • Switching circuit 120B is also provided between distributor 130 and antenna 110B, and switching circuit 120B connects distributor 130 and antenna 110B during transmission.
  • a phase shifter 140 is provided closer to the distributor 130 than the switching circuit 120B.
  • the signal whose phase is changed by the phase shifter 140 is sent to the antenna 110B.
  • no phase shifter is provided between the antenna 110 ⁇ / b> A and the distributor 130. Therefore, the phase of the radio wave transmitted from antenna 110A and the phase of the radio wave transmitted from antenna 110B are different from each other.
  • the ECU 200 includes a calculation unit 210, a communication chip 220, a switching circuit 230, an antenna changeover switch 240, a GNSS reception unit 250, a security access module (SAM) 260, a mobile phone transmission / reception unit 270, and a power source 280.
  • SAM security access module
  • the GNSS receiving unit 250 is connected to the GNSS antenna 170 via the coaxial cable 30, and filters, amplifies, and demodulates a signal supplied from the GNSS antenna 170 and supplies received data to the arithmetic unit 210.
  • the SAM 260 encrypts and decrypts a signal transmitted and received by vehicle-to-vehicle communication or road-to-vehicle communication.
  • the cellular phone transmission / reception unit 270 is connected to the cellular phone line antenna 190 via the coaxial cable 40 and has a transmission / reception function for connection to the cellular phone line. Transmission data to the mobile phone line is input from the calculation unit 210, and reception data from the mobile phone line is output to the calculation unit 210.
  • the power supply 280 supplies power to various components inside the ECU 200 and also supplies power to the components of the antenna module 100.
  • the calculation unit 210 includes a CPU 211, a memory 212, and an interface (I / F) 213.
  • the memory 212 is nonvolatile and stores phase shift amount information described later. Although not shown, a volatile memory is also provided.
  • the I / F 213 is connected to a CAN 300 that is a communication network in the vehicle. The calculation unit 210 can acquire various information in the vehicle via the I / F 213 and the CAN 300, or can provide information to devices in the vehicle.
  • the communication chip 220 includes two receiving units 221, 222, a transmitting unit 223, and a baseband unit 224.
  • it is the specification which performs vehicle-to-vehicle communication and road-to-vehicle communication according to the communication standard of IEEE802.11p.
  • the receiving unit 221 is connected to the coaxial cable 10, and a signal received by the antenna 110 ⁇ / b> A is input via the coaxial cable 10.
  • the receiving unit 221 filters and amplifies the input signal and sends it to the baseband unit 224.
  • the function of the other receiving unit 222 is the same as that of the receiving unit 221 described above.
  • the receiving unit 222 is connected to the antenna 110B via the switching circuit 230 and the coaxial cable 20.
  • the transmission unit 223 is also connected to the switching circuit 230.
  • the switching circuit 230 switches between a state where the reception unit 222 and the coaxial cable 20 are connected and a state where the transmission unit 223 and the coaxial cable 20 are connected.
  • the connection state of the switching circuit 230 is switched by the antenna switching switch 240.
  • the antenna changeover switch 240 has a transmission / reception changeover function based on the communication state of the communication chip 220.
  • the baseband unit 224 performs modulation and demodulation. During reception, reception diversity (here, maximum ratio combining diversity) is performed.
  • the communication chip 220 configured as described above can communicate with the arithmetic unit 210.
  • the communication chip 200 and the arithmetic unit 210 communicate with each other both when receiving radio waves and when transmitting radio waves.
  • FIG. 2 shows a mounted state of the vehicle wireless communication device 1.
  • This figure is a diagram for illustrating the positional relationship between the antennas 110A and 110B and the vehicle roof 2, and components other than the antennas 110A and 110B are omitted from the components included in the ECU 200 and the antenna module 100.
  • the vehicle wireless communication device 1 is formed into a streamlined shape (so-called shark fin shape) from the front of the vehicle to the rear of the vehicle for reasons of appearance design.
  • the ground plane 4 has a substantially rectangular planar shape and is made of a metal plate. In a state where the vehicle wireless communication device 1 is mounted on the roof surface 2 a of the vehicle roof 2, the ground plane 4 runs along the roof surface 2 a of the vehicle roof 2.
  • a planar substrate 5 made of resin is erected substantially vertically (including a state close to vertical) on a ground plane surface 4a which is an upper surface portion of the ground plane 4.
  • an antenna ground 6 is formed by a conductor pattern (conductor film), and a connection portion 7 for electrically connecting the antenna ground 6 and the ground plane 4 is formed by a conductor pattern.
  • the antenna ground 6 is formed at a predetermined interval from the ground plane surface 4 a of the ground plane 4, and has the same potential as the ground plane 4 through the connection portion 7.
  • the antenna ground 6 is formed in a rectangular shape having a certain width in both the vertical direction and the horizontal direction.
  • the antenna 110 ⁇ / b> A is connected to the upper end 6 a of the antenna ground 6.
  • the antenna 110A is a linear monopole that transmits and receives vertically polarized waves, and the base end portion 110Aa is electrically connected.
  • the antenna 110A is connected so as to move away from the antenna ground 6 in a substantially vertical direction from the base end portion 110Aa toward the tip end portion 110Ab.
  • the length (element length) of the antenna 110 is electrically “1/4” wavelength.
  • the wavelength of the radio wave in the 5.9 GHz band is multiplied by “1/4”, and the ratio of the material of the substrate 5 is further increased. It is the length multiplied by the wavelength shortening rate due to the dielectric constant.
  • a feeding point 9 for supplying power to the antenna 110 is provided at the base end portion 110Aa of the antenna 110.
  • the antenna 110A is provided at a position where the height from the ground plane surface 4a to the base end portion 110Aa is approximately 40 [mm].
  • the antenna 110 ⁇ / b> B is connected to the lower end 6 b of the antenna ground 6.
  • the antenna 110B is also a linear monopole that transmits and receives vertically polarized waves, and the base end portion 110Ba is electrically connected.
  • the antenna 110B is connected so as to move away from the antenna ground 6 in a substantially vertical direction from the base end portion 110Ba to the tip end portion 110Bb.
  • the length of the antenna 110B (element length) is also electrically “1/4” wavelength, for example, multiplied by “1/4” to the wavelength of the radio wave in the 5.9 GHz band, and the ratio of the material of the substrate 5 It is the length multiplied by the wavelength shortening rate due to the dielectric constant.
  • a feed point 12 for supplying power to the antenna 110B is provided at the base end portion 110Ba of the antenna 110B.
  • the antenna 110B is provided at a position where the height from the ground plane surface 4a to the base end portion 110Ba is about 20 [mm].
  • the respective axes of the antennas 110 ⁇ / b> A and 110 ⁇ / b> B are displaced in the horizontal direction from the central portion 6 c of the antenna ground 6.
  • the width of the antenna ground 6 in the horizontal direction is, for example, wider than the length obtained by multiplying the wavelength of the radio wave in the 5.9 GHz band by “1 ⁇ 4” and further multiplying the wavelength shortening rate by the relative dielectric constant of the material of the substrate 5. It is desirable.
  • the spacing between the feeding points 9 and 12 is, for example, multiplied by “1 ⁇ 2” to the wavelength of the radio wave in the 5.9 GHz band so as to suppress the correlation between the antennas 110 and 11 as space diversity. It is desirable that the length is larger than the length multiplied by the wavelength shortening rate due to the relative dielectric constant of the material of the substrate 5.
  • FIGS. 3A and 3B show the simulation results of the horizontal directivity of the antennas 110A and 110B in the configuration shown in FIG. 2, respectively.
  • transmission is not performed using the antennas 110A and 110B having directivity shown in FIGS. 3A and 3B, respectively, but a phase difference is generated by the phase shifter 140. Radio waves are radiated from the two antennas 110A and 110B.
  • the phase shifter 140 By adjusting the phase radiated from the antenna 110B by the phase shifter 140, the combined radiation characteristic (synthetic directivity) obtained by combining the radiation from the two antennas 110A and 110B can be changed.
  • the two antennas 110A and 110B have different positions in the horizontal direction and also have different positions in the vehicle front-rear direction.
  • both the directivity on the horizontal plane and the directivity on the vertical plane can be changed by causing the phase shifter 140 to generate a phase difference.
  • Fig. 4 shows the change in the directivity of the horizontal plane.
  • FIG. 5 shows a change in directivity on the vertical plane. 4 and 5, the phase of the lower antenna 110B is advanced.
  • the directivity of the horizontal plane can be made to be forward directivity, non-directivity, or backward directivity.
  • the omnidirectionality includes not only perfect omnidirectionality but also what can be regarded as a state close thereto.
  • the directivity of the vertical plane can be made small in elevation or large in elevation.
  • the vehicular wireless communication apparatus 1 includes the distributor 130, and performs transmission using both of the two antennas 110A and 110B used for reception diversity at the time of transmission. Yes.
  • the phase shifter 140 is provided between the one antenna 110B and the distributor 130. By adjusting the amount of phase shift of the phase shifter 140, the combined directivity is changed, and the angle of the installation state, etc. Appropriate directivity according to Therefore, transmission performance is improved. (Second Embodiment) Next, a second embodiment will be described. In the following description of the second embodiment, elements having the same reference numerals as those used so far are the same elements as those of the previous embodiments unless otherwise specified. .
  • the antenna module 100-1 of the second embodiment shown in FIG. 6 has all the configurations of the antenna module 100 of the first embodiment.
  • a DC coupling unit 112 a power source unit 114, three band pass filters (BPF) 122, 124, 126, a transmission power detection unit 128, a carrier sense unit 132, and a switching control unit 134 are provided.
  • a coaxial cable 50 is connected between the antenna 110A (not shown in FIG. 6) and the switching circuit 120A, and a coaxial cable 60 is connected between the antenna 110B (not shown in FIG. 6) and the switching circuit 120B. Connected with.
  • the DC coupling unit 112 is connected to a signal line between the switching circuit 120 ⁇ / b> C and the coaxial cable 20, and the signal of the transmission line is input to the power supply unit 114 via the DC coupling unit 112.
  • the transmission power detection unit 128 transmits a transmission power monitor signal to the communication chip 220 in the ECU 200.
  • the communication chip 220 adjusts the output power according to the transmission power monitor signal.
  • the switching control unit 134 performs control to switch the connection state of the switching circuits 120A to 120C.
  • the carrier sense unit 132 detects a transmission signal input through the coaxial cable 20 and determines whether transmission is in progress.
  • the switching control unit 134 controls the connection state of the switching circuits 120A to 120C using the determination result of the carrier sense unit 132.
  • the ECU 200 is not provided with the antenna switching switch 240.
  • the phase shifter 140 is configured to control the amount of phase shift electronically. A control value for instructing the amount of phase shift is input to the phase shifter 140 from the ECU 200.
  • Other configurations are the same as those in FIG.
  • FIG. 8 shows the configuration of the vehicle wireless communication device 1-1 of the fourth embodiment. As shown in FIG. 8, the switching circuits 120A and 120B, the distributor 130, the phase shifter 140, the low noise amplifiers 150A and 150B, and the power amplifier 160 that are included in the antenna module 100 in the first embodiment are the same as those in the fourth embodiment.
  • the ECU 200-1 includes the ECU 200-1.
  • the ECU 200-1 may include the distributor 130, the phase shifter 140, the transmission / reception amplifiers (low noise amplifiers 150A and 150B, the power amplifier 160), and the like.
  • the phase shifter 140 is configured to electronically control the amount of phase shift. A control value that indicates the amount of phase shift is input to the phase shifter 140 from the arithmetic unit 210.
  • the antenna module 100-2 includes two antennas 110A and 110B as in the previous embodiments, and four switching circuits 120D and E are respectively provided to the two antennas 110A and 110B. , F, G, one low noise amplifier 150C, 150D, and one power amplifier 161A, B.
  • the four switching circuits 120D, E, F, and G are all controlled to be switched by the antenna switching switch 240 of the ECU 200-1.
  • the antennas 110A and 110B are connected to the power amplifiers 161A and 161B at the time of transmission by the two switching circuits 120D, EF and G respectively provided for each antenna 110A.
  • the arithmetic unit 210 is configured to adjust the phase shift amount of the phase shifter 140.
  • the following embodiment is an embodiment showing a method for setting a phase shift amount of the phase shifter 140. Of the embodiments described so far, any configuration that can adjust the phase amount of the phase shifter 140 can be used in the following embodiments.
  • each step of the flowchart described below is executed by the arithmetic unit 210 of the ECU 200 except for the step of inputting phase shift amount information.
  • step S1 an operator inputs phase shift amount information from a predetermined input device.
  • the input phase shift amount information is stored in the memory 212 (step S2).
  • phase shift amount information is read from the memory 212 (step S11), and a control value for phase shift amount control is set based on the read phase shift amount information (step S11). S12). This control value is input to the phase shifter 140.
  • FIGS. 12 and 13 are executed instead of the processes shown in FIGS. As in FIG. 10, FIG. 12 is performed before communication.
  • step S21 phase shift amount information for road-to-vehicle communication is input.
  • the input phase shift amount information for road-to-vehicle communication is stored in the memory 212 (step S22).
  • phase shift amount information for inter-vehicle communication is input (step S23).
  • the input phase shift amount information for inter-vehicle communication is also stored in the memory 212 (step S24). Note that the values of the phase shift amount information for road-to-vehicle communication and the phase shift amount information for inter-vehicle communication are determined in advance based on experiments.
  • step S31 it is determined whether or not the communication is road-to-vehicle. This determination is made based on, for example, the type of signal to be transmitted. If the signal is for another vehicle, the determination is NO, and if the signal is for a roadside machine, the determination is YES. Note that this determination may be made under various conditions (for example, whether the transmission device for receiving signals is an in-vehicle device or a roadside device) before a signal to be transmitted is determined.
  • phase shift amount information for road-to-vehicle communication is read from the memory 212 (step S32).
  • vehicle-to-vehicle communication S31: NO
  • phase shift amount information for road-to-vehicle communication is read from the memory 212 (step S33).
  • step S32 or S33 When step S32 or S33 is executed, a control value for phase shift amount control is set based on the read phase shift amount information (step S34).
  • step S41 phase shift amount information for high elevation angle communication is input.
  • the input phase shift amount information for large elevation angle communication is stored in the memory 212 (step S42).
  • step S43 phase shift amount information for small elevation angle communication is input.
  • the input phase shift amount information for small elevation angle communication is also stored in the memory 212 (step S44).
  • large elevation angle and small elevation angle mean that one is larger or smaller than the other, and phase shift amount information for large elevation angle communication and phase shift amount information for small elevation angle communication are, for example,
  • the phase difference shown in FIG. 5 is 30 ° and 270 °.
  • vehicle speed information is read through the CAN 300 and the I / F 213 (step S51). Then, it is determined from the vehicle speed information whether the vehicle is traveling at a high speed exceeding a predetermined vehicle speed (step S52).
  • step S53 If it is determined that the vehicle is traveling at high speed (S52: YES), the process proceeds to step S53, and phase shift amount information for a small elevation angle is read from the memory 212. On the other hand, if it is determined that the vehicle is not traveling at high speed (S52: NO), the process proceeds to step S54, and phase shift amount information for increasing the elevation angle is read from the memory 212.
  • step S55 a control value for phase shift amount control is set based on the phase shift amount information read in step S53 or S54. Whether or not the vehicle is traveling at high speed is determined to determine whether or not the vehicle is traveling in an urban area. Experiments have shown that the elevation angle is large when traveling at a high speed (running in a non-urban area) and the elevation angle is small during high-speed traveling (running in a city area). Because I discovered it.
  • phase shift amount information is not limited to two types for high elevation angle communication and small elevation angle communication, but three or more types of phase shift amount information with different elevation angles are stored in the memory 212, and these three or more types of phase shift information are stored.
  • the phase amount information may be set according to the vehicle speed. (Ninth embodiment) In the ninth embodiment, FIG. 16 is executed instead of FIG. 15 in the eighth embodiment. The process of FIG. 14 is also performed in the ninth embodiment.
  • step S61 camera sensor information is read via the CAN 300 and the I / F 213 (step S61). Then, it is determined from the camera sensor information whether there is a large vehicle immediately ahead (whether the preceding vehicle is a large vehicle) (step S62).
  • step S63 If it is determined that there is a large vehicle ahead (S62: YES), the process proceeds to step S63, and the phase shift amount information for large elevation angle is read from the memory 212. On the other hand, if it is determined that there is no large vehicle ahead (S62: NO), the process proceeds to step S64, and phase shift amount information for small elevation angle is read from the memory 212.
  • step S65 a control value for phase shift amount control is set based on the phase shift amount information read in step S63 or S64. In this way, even when there is a large vehicle ahead, good communication can be performed while suppressing the influence of radio wave shielding by the large vehicle. Further, since the elevation angle is small when there is no large vehicle ahead, the communication distance can be secured as compared with the case where the elevation angle is large.
  • three or more types of phase shift amount information having different elevation angles may be stored in the memory 212.
  • the three or more types of phase shift amount information are set according to the height of the preceding vehicle. Also, in consideration of the distance to the preceding vehicle in addition to the height of the preceding vehicle, the higher the height of the preceding vehicle and the closer the distance to the preceding vehicle, the larger the amount of phase shift information is used. May be.
  • the processing shown in FIG. 17 is performed as processing performed in advance before communication.
  • step S71 omnidirectional phase shift amount information is input.
  • the input omnidirectional phase shift amount information is stored in the memory 212 (step S72).
  • step S73 forward directivity type phase shift amount information is input.
  • the inputted forward directivity type phase shift amount information is also stored in the memory 212 (step S74).
  • the non-directional type phase shift amount information and the forward directional type phase shift amount information are, for example, the phase differences of 90 ° and 180 ° shown in FIG.
  • vehicle speed information is read via the CAN 300 and the I / F 213 (step S81). Then, based on the vehicle speed information, it is determined whether or not the vehicle is traveling on a highway (step S82). Instead of the vehicle speed information, it may be determined whether the vehicle is traveling on a highway from map information and current position information.
  • step S83 If it is determined that the vehicle is traveling at high speed (S82: YES), the process proceeds to step S83, and the forward directional type phase shift amount information is read from the memory 212. On the other hand, if it is determined that the vehicle is not traveling at high speed (S82: NO), the process proceeds to step S84, and omnidirectional phase shift amount information is read from the memory 212.
  • step S85 a control value for phase shift amount control is set based on the phase shift amount information read in step S83 or S84.
  • the forward directivity type is used because there is no communication target (vehicle or roadside machine) in the front-rear direction while driving on the expressway, so there is no need to transmit radio waves in the crossing direction. is there.
  • phase shift amount information for the vehicle model X is input.
  • the input phase shift amount information for the vehicle model X is stored in the memory 212 (step S92).
  • step S93 phase shift amount information for the vehicle model Y is input.
  • the phase shift amount information for the vehicle model Y is also stored in the memory 212 (step S94).
  • phase shift amount information for the vehicle model Z is also input (step S95).
  • phase shift amount information for the vehicle model Z is also stored in the memory 212 (step S96).
  • phase shift amount information of three vehicle models X, Y, and Z is input and stored.
  • phase shift amount information of two or four or more vehicle models is stored. It may be.
  • step S101 vehicle model information is read via the CAN 300 and the I / F 213.
  • step S103 determine what the loaded vehicle model was. If the read vehicle model is X, the process proceeds to step S103, and the phase shift amount information for the vehicle model X is read from the memory 212. If the read vehicle model is Y, the process proceeds to step S104, and phase shift amount information for the vehicle model Y is read from the memory 212. If the read vehicle model is Z, the process proceeds to step S105, and the phase shift amount information for the vehicle model Z is read from the memory 212.
  • step S106 a control value for phase shift amount control is set based on the phase shift amount information read in any of steps S103, 104, and 105.
  • the two antennas 110A and 110B have different positions in the vehicle front-rear direction and positions in the vertical direction.
  • the two antennas may be different in only the position in the front-rear direction with the same position in the vertical direction (Modification 1).
  • the relative positional relationship between the two antennas may be variously changed.
  • the number of antennas may be three or more (Modification 2).
  • this indication is applicable also except for vehicles.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Remote Sensing (AREA)
  • Power Engineering (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Radio Transmission System (AREA)
PCT/JP2013/004992 2012-09-03 2013-08-23 無線通信装置 Ceased WO2014034068A1 (ja)

Priority Applications (2)

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US14/425,285 US9356812B2 (en) 2012-09-03 2013-08-23 Wireless communication apparatus
DE112013004323.8T DE112013004323T5 (de) 2012-09-03 2013-08-23 Drahtloskommunikationsvorrichtung

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JP2012-193248 2012-09-03
JP2012193248A JP5821812B2 (ja) 2012-09-03 2012-09-03 無線通信装置

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DE112013004323T5 (de) 2015-06-03
JP2014050028A (ja) 2014-03-17
US9356812B2 (en) 2016-05-31
US20150229500A1 (en) 2015-08-13

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