WO2023242913A1 - Dispositif de commande de directivité de transmission et procédé de commande - Google Patents

Dispositif de commande de directivité de transmission et procédé de commande Download PDF

Info

Publication number
WO2023242913A1
WO2023242913A1 PCT/JP2022/023656 JP2022023656W WO2023242913A1 WO 2023242913 A1 WO2023242913 A1 WO 2023242913A1 JP 2022023656 W JP2022023656 W JP 2022023656W WO 2023242913 A1 WO2023242913 A1 WO 2023242913A1
Authority
WO
WIPO (PCT)
Prior art keywords
circuit
optical signal
loop circuit
frequency
transmission directivity
Prior art date
Application number
PCT/JP2022/023656
Other languages
English (en)
Japanese (ja)
Inventor
健 平賀
穂乃花 伊藤
斗煥 李
宏礼 芝
淳 増野
裕文 笹木
康徳 八木
知哉 景山
Original Assignee
日本電信電話株式会社
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 日本電信電話株式会社 filed Critical 日本電信電話株式会社
Priority to PCT/JP2022/023656 priority Critical patent/WO2023242913A1/fr
Publication of WO2023242913A1 publication Critical patent/WO2023242913A1/fr

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/25—Arrangements specific to fibre transmission
    • H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
    • 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

Definitions

  • the present invention relates to a transmission directivity control device and a control method technique.
  • phased array antennas that do not use mechanical moving parts are often used. Phased array antennas do not use mechanically moving parts, so they have high durability and followability, making them suitable for making antennas smaller and lighter.
  • a phased array antenna uses means such as a variable delay circuit, a variable attenuator circuit, and digital signal processing connected to a plurality of antenna elements arranged on a line or plane.
  • the phased array antenna performs beam steering electronically by controlling (referred to as weighting) the phase and amplitude of an RF (Radio Frequency) signal fed to each antenna element.
  • RF Radio Frequency
  • Phased array antennas that perform weighting using analog circuits are often used in fifth-generation mobile communication systems that use millimeter wave bands (Non-Patent Document 1) and millimeter wave wireless LAN (Local Area Network) systems. There is.
  • the range in which wireless communication partners exist varies not within a two-dimensional plane but within a three-dimensional space, so beam steering is required in two axes, such as azimuth and elevation. be. Therefore, weighting is required for the phased array antenna to perform two-dimensional beam steering using a two-dimensional array antenna in which antenna elements are arranged in a planar manner.
  • Non-Patent Document 1 discloses a 256-element phased array antenna used in a 5th generation mobile communication base station in the 28 GHz band.
  • the use of, for example, the 300 GHz band (so-called terahertz band) is being considered.
  • the free space propagation loss will increase 100 times (in other words, the free space propagation loss will increase by 20 dB). It is expected that tens of thousands of antenna elements will be required to compensate for this.
  • each phase shifter circuit In order to minimize the feed loss to the antenna elements, it is necessary to place each phase shifter circuit near each antenna element. power supply circuits, etc. are arranged, and power is supplied via through-holes.
  • the radio frequency As the radio frequency becomes higher and the antenna element spacing becomes narrower, it becomes difficult to two-dimensionally arrange a large number of phase shifter circuits and the like at intervals equivalent to the antenna element spacing.
  • the radio frequency is 300 GHz
  • the free space wavelength is 1 mm
  • the spacing between antenna elements is generally half the wavelength, that is, 0.5 mm.
  • Non-Patent Document 3 proposes a method in which signals are converted into light and then weighted by an optical circuit. This is thought to increase the possibility of configuring a multi-element, two-dimensional weighting circuit, but since the number of components in the weighting circuit increases according to the number of antenna elements, it is necessary to suppress the increase in the number of components as much as possible. A method that can accommodate an increase in the number of antenna elements is necessary.
  • Patent Document 1 discloses a three-dimensional optical circuit that performs two-dimensional beam steering using a wavelength dispersive line, but it requires a matrix circuit with multilayer wiring that is difficult to manufacture, and a planar circuit is required. Not suitable for mass production through manufacturing processes.
  • Non-Patent Document 5 a one-dimensional (within one plane) phase shift circuit performed by a planar phase shift circuit is combined with an FBG (fiber bragg gratings) reflection line whose delay time differs depending on the optical wavelength. ), a means is disclosed for implementing two-dimensional beam steering by allowing beam steering in the direction of a plane perpendicular to said plane by means of an FBG reflection line. With this configuration, two-dimensional beam steering can be performed while reducing the number of circuit parts.
  • FBG fiber bragg gratings
  • the beam forming means using wavelength multiplexing disclosed in Patent Document 2 is also thought to be expandable to two-dimensional and multi-element systems, but with the increase in the number of antenna elements and two-dimensional design, the number of components constituting the circuit will increase. However, as the number of antenna elements and the number of beams increases, the number of wavelength multiplexing increases, so the required optical frequency bandwidth becomes enormous.
  • Non-Patent Document 4 an input optical signal is made to circulate multiple times in a loop circuit, and a predetermined amount of time delay and a predetermined amount of optical frequency shift are given to the optical signal each time the input optical signal goes around, thereby changing the wavelength and delay time.
  • a method has been disclosed in which a transmission beam is scanned by outputting a large number of optical signals with different values and feeding RF signals with time differences to each element of a one-dimensional phased array antenna. According to this method, the number of optical frequencies used in the circuit increases in proportion to the number of antenna elements, but the scale of the array antenna to be controlled can be increased without increasing the scale of the beam scanning circuit.
  • a method for performing two-dimensional beam scanning is not disclosed.
  • the present invention aims to provide a technology for configuring a two-dimensional array antenna without increasing the number of components configuring a phase weighting circuit for beam scanning in accordance with the number of antenna elements. .
  • One aspect of the present invention is a transmission directivity control device that controls the transmission directivity of a two-dimensional array antenna in which antenna elements are arranged in a first direction and a second direction.
  • a first loop circuit generates a signal to be radiated from the antenna element in the first direction by shifting the frequency to the high frequency side and giving a delay time according to the number of times the transmission directivity is controlled.
  • a second loop circuit that generates a signal radiated from the antenna element in the second direction by shifting the frequency of the optical signal output from the first loop circuit to a higher frequency side and giving a delay time;
  • This is a transmission directivity control device comprising:
  • One aspect of the present invention is a control method for a transmission directivity control device that controls the transmission directivity of a two-dimensional array antenna in which antenna elements are arranged in a first direction and a second direction.
  • the circuit radiates the input optical signal from the antenna element in the first direction by shifting the frequency to a higher frequency side and giving a delay time according to the number of times the input optical signal has circulated to control the transmission directivity.
  • a second loop circuit shifts the frequency of the optical signal output from the first loop circuit to the high frequency side and gives a delay time, thereby causing the optical signal to be radiated from the antenna element in the second direction.
  • This is a control method that generates a signal to
  • the present invention it is possible to provide a technique for configuring a two-dimensional array antenna without increasing the number of components configuring a phase weighting circuit for beam scanning in accordance with the number of antenna elements.
  • FIG. 1 is a diagram illustrating a configuration example of a conventional transmission system. It is a figure showing the demultiplexing characteristic of a duplexer.
  • FIG. 3 is a diagram showing the relationship between the frequency and delay time of the components of an optical signal that reaches a demultiplexer after signal processing by a loop circuit.
  • 1 is a diagram showing a configuration example of a first embodiment of a transmission system according to the present invention. It is a figure which shows the branching characteristic of a branching filter for vertical scanning.
  • FIG. 3 is a diagram showing the branching characteristics of the first to third horizontal scanning branching filters.
  • FIG. 3 is a diagram showing the relationship between the frequency and delay time of each component of an optical signal input to a vertical scanning demultiplexer.
  • FIG. 3 is a flowchart showing a specific example of the flow of processing performed by a transmission directivity control device regarding an optical signal.
  • 3 is a flowchart showing a specific example of the flow of processing performed by a transmission directivity control device regarding an optical signal.
  • 1 is a diagram illustrating a configuration example of a multi-beam transmission system.
  • FIG. 7 is a diagram illustrating a configuration example in which a loop circuit is shared by polarization multiplexing within an optical waveguide in the case of multi-beam conversion and beam use.
  • FIG. 2 is a diagram illustrating a configuration example of a polarization synthesizer.
  • FIG. 1 is a diagram showing a configuration example of a conventional transmission directivity control device 45 in a transmission system 900, in which the configuration has a linear array in which three antenna elements are arranged vertically.
  • the transmission directivity control device 45 includes a light source 902, an optical modulator 903, a directional coupler 904, a demultiplexer 99, an array antenna 99 including three antenna elements, a direction indicating circuit 901, and a direction indicating circuit 901.
  • a loop circuit 91 is provided which is connected via a branch at a coupler 904 .
  • the transmission directivity control device 45 controls the transmission directivity of the array antenna 99 connected to its own device.
  • Array antenna 99 has a linear array.
  • Array antenna 99 includes a duplexer 990 and three vertically arranged antenna elements 991 to 993.
  • a signal is input to the loop circuit 91 from the second output terminal of the directional coupler 904, and an output signal is input to the second input terminal of the directional coupler 904.
  • the loop circuit 91 includes an optical SSB modulator 905 that performs carrier suppression single sideband modulation (SSB modulation), an RF local oscillator 906 that generates an RF (radio frequency) unmodulated signal with a frequency ⁇ f, a filter 907, an amplifier 908, and a delay.
  • a delay circuit 909 whose amount can be changed is provided.
  • the time required for the signal to go around once is ⁇ , and is configured to be able to change ⁇ by changing the delay time of the delay circuit 909.
  • the SSB modulator 905 has a function of shifting the input optical signal by the frequency ⁇ f to the high frequency side (that is, modulating the upper sideband (USB)). Therefore, the time of the optical signal input to the loop circuit 91 is delayed by ⁇ and the frequency is shifted to a higher frequency by ⁇ f each time it makes one round.
  • three optical frequency channels are defined, and are respectively designated ch1 to ch3 from the low frequency side.
  • the spacing between the three channels is ⁇ f.
  • the direction instruction circuit 901 determines the amount of time delay in the delay circuit 909 based on the beam direction information input to the transmission directivity control device 45 or the beam number information set in association with the beam direction. It has the function of controlling.
  • the inputs of the transmission directivity control device 45 are a transmission signal, which is an electrical signal on which information to be transmitted wirelessly is superimposed, and information on a beam direction or a beam number set in association with the beam direction.
  • the output of the transmission directivity control device 45 is an electromagnetic wave that has directivity in the direction of the beam from the antenna array and is radiated into space.
  • the circuit for converting an optical signal into an RF signal is not shown in FIG. 1, for example, two optical signals with different frequencies are input to a photomixer using a photodiode, and the A circuit is used that extracts the difference frequency as an RF signal.
  • Unmodulated light of frequency channel ch1 outputted from the light source 902 and a transmission signal inputted to the transmission directivity control device 45 are inputted to the optical modulator 903.
  • the optical modulator 903 modulates light with a transmission signal to generate an optical signal. Note that if the application is not for information transmission, modulation is not performed here.
  • the optical signal is input to the first input terminal (the upper left terminal in FIG. 1) of the directional coupler 904 and is divided into two by the directional coupler 904.
  • One output of the directional coupler 904 is directly output from the first output terminal (top right) and input to the duplexer.
  • the other output of the directional coupler 904 is output from the second output terminal (lower right), enters the loop circuit 91, and is shifted in frequency to the high frequency side by ⁇ f in the optical SSB modulator 905. After that, the signal passes through a filter 907 and an amplifier 908, is given a predetermined time delay in a delay circuit 909, and is input to the second input terminal (lower left) of the directional coupler 904, completing the first round.
  • the optical signal is divided into two by the directional coupler 904, one of which is input to the demultiplexer 99 from the first output terminal, and the other is input to the loop circuit 91 again from the second output terminal.
  • FIG. 3 shows the relationship between the frequency and delay time of the optical signal components that reach the demultiplexer 99 after such signal processing. As the number of circuits around the loop circuit 91 increases, the delay time increases by ⁇ , the frequency shifts to a higher frequency by ⁇ f, and the channel number increases by 1.
  • the filter 907 is installed to prevent an infinite loop of the optical signal in the loop circuit 91, and its pass band is set to be the band of ch2 and ch3, as shown in FIG. There is.
  • the optical SSB modulator 905 further shifts to the high frequency side by ⁇ f, but since it cannot pass through the filter 907, the optical signal The number of times that the signal goes around the loop circuit 91 is limited to two times.
  • the demultiplexing characteristics of the demultiplexer 99 are shown in FIG.
  • the optical signals of ch1, ch2, and ch3 are output from output terminals 1 to 3, respectively, and are converted to RF signals via circuits (not shown) that convert optical signals to RF signals.
  • the light is radiated toward space from antenna elements 1 to 3, respectively.
  • the RF signals radiated into space at antenna elements 1 to 3 are as shown in FIG.
  • This is an RF signal obtained by converting signal 914. Since these signals are a set of signals with a gradient time delay of ⁇ , the direction of the beam can be changed by changing the amount of time delay in the delay circuit 909, and the beam direction as a phased array antenna can be changed. A scan can be performed.
  • the configuration shown in Figure 1 provides an operation in which equal delay times and equal frequencies are sequentially given to the input optical signal, so it can only be used for beam scanning of a one-dimensional array antenna.
  • first to third examples will be explained.
  • an embodiment of a transmission directivity control device having a two-dimensional array antenna is shown in which the scanning loop circuit has a two-stage configuration.
  • the second example shows an embodiment of a transmission directivity control device that enables multi-beam transmission.
  • the third embodiment is an embodiment of a transmission directivity control device that enables multi-beam transmission, and shows a configuration in which polarization multiplexing is used in an optical circuit when the number of beams is two.
  • a means for performing beam scanning in two planes for example, azimuth angle and elevation angle
  • two loop circuits in combination for example, azimuth angle and elevation angle
  • a one-dimensional array antenna is used to solve the above-mentioned existing problem. This solves the problem of only being able to perform one-dimensional beam scanning.
  • FIG. 4 shows an example of the configuration of the transmission directivity control device 90 in the transmission system 100 according to the first example.
  • Two stages of loop circuits are arranged in series, each being a horizontal scanning loop circuit 11a and a vertical scanning loop circuit 11b.
  • the output of the vertical scanning loop circuit 11b arranged in the latter stage is sent to a two-stage branching filter (vertical scanning branching filter, first horizontal scanning branching filter to third horizontal scanning branching filter). It is connected to a two-dimensional array antenna 61 via the antenna.
  • the horizontal scanning loop circuit 11a shifts the frequency of the input optical signal to the high frequency side according to the number of circuits to control the transmission directivity, and gives a delay time to the input optical signal in the first direction (horizontal direction).
  • This is an example of a first loop circuit that generates a signal radiated from an antenna element in a direction (direction).
  • the vertical scanning loop circuit 11b shifts the frequency of the optical signal output from the first loop circuit to the high frequency side and gives it a delay time, thereby radiating it from the antenna element in the second direction (vertical direction).
  • This is an example of a second loop circuit that generates a signal.
  • the two-dimensional array antenna 61 includes a vertical scanning duplexer 60 and horizontal scanning duplexers 51, 52, and 53.
  • the horizontal scanning duplexers 51, 52, and 53 are connected to the vertical scanning duplexer 60.
  • Each of the horizontal scanning duplexers 51, 52, and 53 is provided with three antenna elements.
  • the RF signal is input to each antenna element, and is radiated into space from each antenna element.
  • optical frequency channels are defined in the optical circuit, and are designated ch1 to ch9 from the low frequency side.
  • the direction instruction circuit 103 controls the horizontal scanning delay circuit 113a and the vertical scanning delay circuit 113a based on beam direction information input to the transmission directivity control device 90 or beam number information set in association with the beam direction. It has a function of controlling the amount of time delay in the delay circuit 113b.
  • the horizontal scanning delay circuit 113a and the vertical scanning delay circuit 113b are examples of delay circuits that delay an optical signal by a predetermined time.
  • the pass band of the horizontal scanning filter 111a is assumed to be "ch1 to ch3"
  • the pass band of the vertical scanning filter 111b is assumed to be ch1 to ch9.
  • the horizontal scanning filter 111a and the vertical scanning filter 111b are examples of filters that allow only optical signals in a predetermined frequency band to pass through.
  • FIG. 5 is a diagram showing the branching characteristics of the vertical scanning branching filter.
  • the branching characteristics of the vertical scanning branching filter are set as shown in FIG.
  • Output terminal 1 is set to ch1, ch2, and ch3.
  • Output terminal 2 is set to ch4, ch5, and ch6.
  • Output terminal 3 is set to ch7, ch8, and ch9.
  • FIGS. 6A to 6C are diagrams showing the demultiplexing characteristics of the first to third horizontal scanning duplexers.
  • ch1 is set to the output terminal 1a.
  • ch2 is set to the output terminal 1b.
  • ch3 is set to the output terminal 1c.
  • ch4 is set to the output terminal 2a.
  • ch5 is set to the output terminal 2b.
  • ch6 is set to the output terminal 2c.
  • ch7 is set to the output terminal 3a.
  • ch8 is set to the output terminal 3b.
  • ch9 is set to the output terminal 3c.
  • the light generated from the light source 104 is modulated by a transmission signal to become an optical signal, which is input to the horizontal scanning loop circuit 11a.
  • the frequency band occupied by the optical signal is ch1. Note that if the transmission configuration control device according to this embodiment is not used for information transmission, the modulation described here will not be performed.
  • optical signal input to the horizontal scanning loop circuit 11a passes through this loop, the time is delayed by ⁇ H, and the frequency is shifted to a high frequency by ⁇ fH.
  • the optical signal output from the horizontal scanning loop circuit 11a and input to the vertical scanning loop circuit 11b is delayed in time by ⁇ V and shifted to a high frequency by ⁇ fV each time it goes around this loop.
  • ⁇ fV may be set to three times ⁇ fH (generally speaking, ⁇ fV may be set to ⁇ fH by more than twice the number of horizontal antenna elements.
  • the frequency shifted in the second loop circuit is greater than or equal to the product of the frequency shifted in the first loop circuit and the number of antenna elements in the first direction).
  • the interval between ch3 and ch4 and the interval between ch6 and ch7 may be set to values exceeding ⁇ fH, and ⁇ fV may be set to a value exceeding three times ⁇ fH.
  • ⁇ fV may be set to a value exceeding three times ⁇ fH.
  • a value that does not greatly exceed three times is appropriate.
  • the delays ⁇ H and ⁇ V are determined by giving predetermined time delays to the horizontal scanning delay circuit 113a and the vertical scanning delay circuit 113b, respectively, based on instructions from the direction indicating circuit 103, and are respectively determined in the horizontal direction. (azimuth angle) and vertical direction (elevation angle).
  • the frequency of the light source 104 is ch1
  • the optical SSB modulator 107a of the horizontal scanning loop generates an upper sideband (USB)
  • the optical SSB modulator 107b of the vertical scanning loop also generates an upper sideband.
  • the optical SSB modulators 107a and 107b are an example of an optical frequency shifter that changes the frequency of an input optical signal to a higher frequency side by a predetermined amount.
  • the passband of the horizontal scanning filter is set to ch1 to ch3.
  • the optical signal generated by the optical modulator is given a time delay and a frequency shift in the horizontal scanning loop circuit 11a and then in the vertical scanning loop circuit 11b, and is input to the vertical scanning demultiplexer.
  • the relationship between the frequency and delay time of each component of the optical signal that is finally input to the vertical scanning demultiplexer after such signal processing is as shown in FIG.
  • the frequency is ch6
  • the signal is input to the duplexer without going around the loop at all (the frequency is ch1).
  • the delay time for is ( ⁇ fV+2 ⁇ fH). Note that although ⁇ V is drawn larger than ⁇ H in FIG. 7, ⁇ V may be less than ⁇ H.
  • the beam By feeding these optical signal components to each antenna element through a vertical scanning demultiplexer and a horizontal scanning demultiplexer, the beam can be tilted to the lower left with respect to the boresight direction of the array surface. .
  • the degree of inclination of the beam can be adjusted by adjusting the delay amount of the horizontal scanning delay circuit 113a and the vertical scanning delay circuit 113b using the direction indicating circuit 103, and by adjusting ⁇ H and ⁇ V respectively independently. good.
  • the two-dimensional antenna array has a nine-element structure with three elements lined up in the vertical direction and three elements lined up in the horizontal direction, but the number of antenna elements may be any number.
  • the scanning directions are horizontal and vertical, combinations of other directions (for example, vertical and horizontal, east-west and north-south, etc.) may be used.
  • FIGS. 8 and 9 are flowcharts showing specific examples of the flow of processing performed by the transmission directivity control device 90 regarding optical signals. Next, a description will be given of the flow of operations in which the transmission directivity control device 90 operates in a state where each circuit performs control according to beam direction information as described above.
  • the light source 104 emits unmodulated light (step S101).
  • Unmodulated light output from light source 104 and a transmission signal input to transmission directivity control device 90 are input to optical modulator 105 .
  • the optical modulator 105 modulates the input unmodulated light with a transmission signal to generate an optical signal (step S102). Note that if the application is not for information transmission, the optical modulator 105 generates an unmodulated optical signal without performing the above-described modulation process.
  • Optical modulator 105 outputs the generated optical signal.
  • the optical signal output by the optical modulator 105 is referred to as an "initial optical signal.”
  • the initial optical signal is an optical signal that has not gone around the horizontal scanning loop circuit 11a, which will be described later.
  • the optical signal output by the optical modulator 105 is input to the first input terminal (the upper left terminal in FIG. 4) of the directional coupler 106a.
  • the directional coupler 106a divides the input optical signal into a plurality of parts (two in FIG. 4) and outputs them (step S103).
  • One output of the optical signal distributed by the directional coupler 106a is output as is from the first output terminal (the upper right terminal in FIG. 4) and is input to the directional coupler 106b.
  • the other output of the directional coupler 106 is output from the second output terminal (lower right terminal in FIG. 4) and enters the horizontal scanning loop circuit 11a.
  • This optical signal is shifted to the high frequency side by ⁇ fH in the optical SSB modulator 107a (step S104).
  • This optical signal is filtered by the horizontal scanning filter 111a (step S105).
  • the horizontal scanning filter 111a filters and blocks optical signals of a predetermined frequency. Through such filtering, optical signals that have not looped through the horizontal scanning loop circuit 11a for a predetermined number of times or more pass through the horizontal scanning filter 111a (step S106-NO), and optical signals that have not looped through the horizontal scanning loop circuit 11a for a predetermined number of times or more pass through the horizontal scanning filter 111a (step S106-NO).
  • the optical signal is blocked (step S106-YES).
  • the optical signal that has passed through the horizontal scanning filter 111a is further amplified by the amplifier 112a (step S107), and then given a predetermined time delay ⁇ H in the horizontal scanning delay circuit 113a (step S108).
  • This optical signal is then input to the second input terminal (lower left terminal in FIG. 4) of the directional coupler 106a, and completes the first rotation of the horizontal scanning loop circuit 11a.
  • This optical signal is further divided into two in the directional coupler 106a (step S103). One of the distributed outputs is input from the first output terminal to the directional coupler 106b, and the other is input from the second output terminal to the horizontal scanning loop circuit 11a again.
  • the optical signal output by the directional coupler 106a is input to the first input terminal (the upper left terminal in FIG. 4) of the directional coupler 106b.
  • the directional coupler 106b divides the input optical signal into a plurality of parts (two in FIG. 4) and outputs them (step S201).
  • One output of the optical signal distributed by the directional coupler 106b is output as is from the first output terminal (the upper right terminal in FIG. 4), and is input to the vertical scanning splitter 60 of the two-dimensional array antenna 61. be done.
  • the other output of the directional coupler 106 is output from the second output terminal (lower right terminal in FIG. 4) and enters the vertical scanning loop circuit 11b.
  • This optical signal is shifted to the high frequency side by ⁇ fV in the optical SSB modulator 107b (step S202).
  • This optical signal is filtered by the vertical scanning filter 111b (step S203).
  • the vertical scanning filter 111b filters and blocks optical signals of a predetermined frequency. Through such filtering, optical signals that have not looped through the vertical scanning loop circuit 11b for a predetermined number of times or more pass through the vertical scanning filter 111b (step S204-NO), and optical signals that have not looped through the vertical scanning loop circuit 11b for a predetermined number of times or more pass through the vertical scanning filter 111b (step S204-NO).
  • the optical signal is blocked (step S204-YES).
  • the optical signal that has passed through the vertical scanning filter 111b is further amplified by the amplifier 112b (step S205), and then given a predetermined time delay ⁇ V in the horizontal scanning delay circuit 113a (step S206).
  • This optical signal is then input to the second input terminal (lower left terminal in FIG. 4) of the directional coupler 106b, and completes the first circuit of the vertical scanning loop circuit 11b.
  • This optical signal is further divided into two in the directional coupler 106b (step S201). One of the distributed outputs is input from the first output terminal to the vertical scanning duplexer 60 of the two-dimensional array antenna 61, and the other is input from the second output terminal to the vertical scanning loop circuit 11b again. Ru.
  • FIG. 10 is a diagram showing a configuration example of a multi-beam transmission system 100.
  • H1, V1 shown in the transmission directivity control device 90-1 in the second embodiment shows a configuration in which ⁇ H in the transmission directivity control device 90 in the first embodiment is set to ⁇ H1, and ⁇ V is set to ⁇ V1.
  • H2, V2) shown in the transmission directivity control device 90-2 in the second embodiment shows a configuration in which ⁇ H in the transmission directivity control device 90 in the first embodiment is set to ⁇ H2, and ⁇ V is set to ⁇ V2.
  • the transmission directivity control device 90-1 receives the light from the light source 104, the first transmission signal, and first beam direction information that specifies the direction of the beam that transmits the signal.
  • the transmission directivity control device 90-2 receives the light from the light source 104, the second transmission signal, and second beam direction information that specifies the direction of the beam that transmits the signal.
  • the outputs of the transmission directivity control device 90-1 and the transmission directivity control device 90-2 are combined by a multiplexer 70.
  • the multiplexer 70 outputs a signal to the vertical scanning duplexer 60.
  • multi-beam transmission two beams in the embodiment shown here
  • FIG. 11 is a diagram showing a configuration example in which a loop circuit is shared by polarization multiplexing within an optical waveguide in the case of multi-beam conversion and beam use.
  • a configuration different from the configuration shown in FIG. 4 will be explained.
  • the horizontally polarized wave generated by the light source 104 is modulated by a first transmission signal in the optical modulator 105a to generate a first optical signal.
  • the vertically polarized wave generated by rotating the polarization plane of the light generated by the light source 104 by 90 degrees by the polarization rotator 201 is modulated with a second transmission signal in the optical modulator 105b to generate a second optical signal. do.
  • the first optical signal and the second optical signal are multiplexed by the polarization multiplexer 202, and thereafter, two orthogonal polarized waves are multiplexed in the horizontal scanning loop circuit 11a and the following vertical scanning loop 11b. state, a time delay and a frequency shift are given.
  • Each scanning loop circuit is composed of polarization-maintaining waveguides and optical components. Further, as shown in FIG. 11, in each loop, a first horizontal scanning delay circuit 1131a, a second horizontal scanning delay circuit 1132a, a first vertical scanning delay circuit 1131b, and a second vertical scanning delay circuit 1132b are provided. . Furthermore, an azimuth angle indicating circuit 103a and an elevation angle indicating circuit 103b are provided. A first beam direction and a second beam direction are input to the azimuth angle indication circuit 103a and the elevation angle indication circuit 103b. The azimuth angle instruction circuit 103a determines the azimuth angle from the first beam direction and the second beam direction, and instructs the second horizontal scanning delay circuit 1132a about the azimuth angle. The elevation angle instruction circuit 103b determines the elevation angle from the first beam direction and the second beam direction, and indicates the azimuth angle to the second vertical scan delay circuit 1132b.
  • a polarization splitter 114a is provided after the amplifier 112a.
  • the polarization splitter 114a splits the optical signal into horizontal polarization and vertical polarization.
  • a first horizontal scanning delay circuit 1131a and a second horizontal scanning delay circuit 1132a are provided in parallel after the polarization splitter 114a.
  • a polarization synthesizer 115a is provided after the first horizontal scanning delay circuit 1131a and the second horizontal scanning delay circuit 1132a.
  • the polarization combiner 115a combines the signals output from the first horizontal scanning delay circuit 1131a and the second horizontal scanning delay circuit 1132a, and inputs the optical signal to the directional coupler 106a.
  • a polarization splitter 114b is provided after the amplifier 112b.
  • the polarization splitter 114b splits the optical signal into horizontal polarization and vertical polarization.
  • a first vertical scanning delay circuit 1131b and a second vertical scanning delay circuit 1132b are provided in parallel after the polarization splitter 114b.
  • a polarization synthesizer 115b is provided after the first vertical scanning delay circuit 1131b and the second vertical scanning delay circuit 1132b.
  • the polarization combiner 115b combines the signals output from the first vertical scanning delay circuit 1131b and the second vertical scanning delay circuit 1132b, and inputs the optical signal to the directional coupler 106b.
  • the optical signal output from the horizontal scanning loop circuit 11a is input to the polarization combiner 203 or the vertical scanning loop circuit 11b.
  • the polarization combiner 203 may be omitted if the characteristics of the vertical scanning splitter or the photomixer that converts an optical signal into an RF signal do not depend on the plane of polarization.
  • FIG. 12 is a diagram showing a configuration example of the polarization synthesizer 203.
  • the polarization combiner 203 includes a polarization splitter 211, a multiplexer 212, and a polarization rotator 213.
  • the polarization splitter 211 splits the optical signal into horizontal polarization and vertical polarization.
  • the optical signal split into horizontally polarized waves by the polarization splitter 211 is input to the multiplexer 212 .
  • the optical signal split into vertical polarization by the polarization splitter 211 is rotated from vertical polarization to vertical polarization by the polarization rotator 213 and input to the multiplexer 212 .
  • the multiplexer 212 multiplexes the input optical signal and outputs it to a circuit that converts it into an RF signal.
  • the subsequent operations are the same as those in the first and second embodiments, so the explanation will be omitted.
  • two-dimensional beam scanning of multiple elements is possible without increasing the number of circuit components.
  • the transmission directivity control device according to the present invention is mounted on a base station installed on the ceiling of a room, it becomes possible to provide area coverage for terminal stations moving around the room. Note that by performing phase shifting using an analog circuit, the number of analog-to-digital converters can be significantly reduced compared to a fully digitally controlled array antenna in which phase shifting is performed entirely by digital signal processing.
  • phase shift is performed by analog processing of optical signals, it is possible to perform not only beam scanning when emitting radio waves but also mechanical beam scanning when emitting light in spatial optical wireless communication (FSO communication) etc. It can be applied to circuits that are implemented electronically rather than driven.
  • FSO communication the direction of radiation is adjusted by a mechanical drive device, which poses problems in equipment weight and mass production, as well as operation and maintenance issues in terms of operating speed and durability. If scanning becomes possible, such problems can be solved.
  • the direction instruction circuit 103, azimuth angle instruction circuit 103a, and elevation angle instruction circuit 103b in the embodiment may be configured using a processor such as a CPU (Central Processing Unit) and a memory.
  • the direction instruction circuit 103, the azimuth angle instruction circuit 103a, and the elevation angle instruction circuit 103b function as the direction instruction circuit 103, the azimuth angle instruction circuit 103a, and the elevation angle instruction circuit 103b when the processor executes the program.
  • each function of the direction indication circuit 103, azimuth angle indication circuit 103a, and elevation angle indication circuit 103b may be implemented using an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), an FPGA (Field Programmable Gate Array), etc. It may also be realized using hardware.
  • the above program may be recorded on a computer-readable recording medium.
  • Computer-readable recording media include portable media such as flexible disks, magneto-optical disks, ROMs, CD-ROMs, semiconductor storage devices (for example, SSDs: Solid State Drives), and hard disks and semiconductor storages built into computer systems. It is a storage device such as a device.
  • the above program may be transmitted via a telecommunications line.
  • the present invention is applicable to controlling a two-dimensional array antenna.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)

Abstract

Un aspect de la présente invention concerne un dispositif de réception optique dans un système de transmission optique dans lequel un signal optique est transmis avec un dispositif de transmission optique et le dispositif de réception optique qui sont connectés par le biais d'un trajet de transmission en fibre optique, ledit dispositif de réception optique comprenant : une unité d'estimation de distribution de canal qui, à partir d'un signal de référence et d'un signal optique émis par le dispositif de transmission optique, estime des informations de distribution de canal dans la direction de transmission ; et une unité de compensation non linéaire qui effectue une compensation non linéaire d'après les informations de distribution de canal estimées par l'unité d'estimation de distribution de canal.
PCT/JP2022/023656 2022-06-13 2022-06-13 Dispositif de commande de directivité de transmission et procédé de commande WO2023242913A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2022/023656 WO2023242913A1 (fr) 2022-06-13 2022-06-13 Dispositif de commande de directivité de transmission et procédé de commande

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2022/023656 WO2023242913A1 (fr) 2022-06-13 2022-06-13 Dispositif de commande de directivité de transmission et procédé de commande

Publications (1)

Publication Number Publication Date
WO2023242913A1 true WO2023242913A1 (fr) 2023-12-21

Family

ID=89192510

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2022/023656 WO2023242913A1 (fr) 2022-06-13 2022-06-13 Dispositif de commande de directivité de transmission et procédé de commande

Country Status (1)

Country Link
WO (1) WO2023242913A1 (fr)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050206563A1 (en) * 2002-06-18 2005-09-22 Bae Systems Plc Common aperture antenna

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050206563A1 (en) * 2002-06-18 2005-09-22 Bae Systems Plc Common aperture antenna

Non-Patent Citations (9)

* Cited by examiner, † Cited by third party
Title
BYUNG-MIN JUNG, JIANPING YAO: "A Two-Dimensional Optical True Time-Delay Beamformer Consisting of a Fiber Bragg Grating Prism and Switch-Based Fiber-Optic Delay Lines", IEEE PHOTONICS TECHNOLOGY LETTERS, IEEE, USA, vol. 21, no. 10, 1 May 2009 (2009-05-01), USA, pages 627 - 629, XP093118860, ISSN: 1041-1135, DOI: 10.1109/LPT.2009.2015275 *
GOUTZOULIS A. P., KEU DAVIES D.: "HARDWARE-COMPRESSIVE 2-D FIBER OPTIC DELAY LINE ARCHITECTURE FOR TIME STEERING OF PHASED-ARRAY ANTENNAS.", APPLIED OPTICS, OPTICAL SOCIETY OF AMERICA, WASHINGTON, DC, US, vol. 29., no. 36., 20 December 1990 (1990-12-20), US , pages 5353 - 5359., XP000171337, ISSN: 0003-6935, DOI: 10.1364/AO.29.005353 *
KOONEN TON; CAO ZIZHENG: "Optically controlled 2D radio beam steering system", MICROWAVE PHOTONICS (MWP) AND THE 2014 9TH ASIA-PACIFIC MICROWAVE PHOTONICS CONFERENCE (APMP) 2014 INTERNATIONAL TOPICAL MEETING ON, IEICE, 20 October 2014 (2014-10-20), pages 389 - 391, XP032712342, DOI: 10.1109/MWP.2014.6994580 *
KUMAR RITESH; RAGHUWANSHI SANJEEV KUMAR: "Efficient 2D Optical Beamforming Network With Sub Partitioning Capability Based on Raised Cosine Chirped Fiber Grating and Mach-Zehnder Delay Interferometer", IEEE PHOTONICS JOURNAL, IEEE, USA, vol. 13, no. 3, 21 May 2021 (2021-05-21), USA , pages 1 - 11, XP011858682, DOI: 10.1109/JPHOT.2021.3082185 *
LIU YUAN, KLAMKIN JONATHAN: "Scalable Integrated Photonics Beamforming Circuits", ASIA COMMUNICATIONS AND PHOTONICS CONFERENCE/INTERNATIONAL CONFERENCE ON INFORMATION PHOTONICS AND OPTICAL COMMUNICATIONS 2020 (ACP/IPOC), OPTICA PUBLISHING GROUP, WASHINGTON, D.C., 1 January 2020 (2020-01-01), Washington, D.C., XP093117259, ISBN: 978-1-943580-82-8, DOI: 10.1364/ACPC.2020.T3E.2 *
LIU YUAN: "Integrated True Time Delays and Optical Beam Forming Networks for Wideband Wireless Communications", DISSERTATION UNIVERSITY OF CALIFORNIA, 1 September 2019 (2019-09-01), pages 1 - 217, XP093118867 *
TSOKOS CHRISTOS; MYLONAS ELIAS; GROUMAS PANOS; GOUNARIDIS LEFTERIS; AVRAMOPOULOS HERCULES; KOULOUMENTAS CHRISTOS: "Optical Beamforming Network for Multi-Beam Operation With Continuous Angle Selection", IEEE PHOTONICS TECHNOLOGY LETTERS, IEEE, USA, vol. 31, no. 2, 15 January 2019 (2019-01-15), USA, pages 177 - 180, XP011705746, ISSN: 1041-1135, DOI: 10.1109/LPT.2018.2889411 *
VIDAL BORJA: "Optical beamformer for large microwave antenna arrays", 16 February 2007 (2007-02-16), XP093118874, Retrieved from the Internet <URL:https://spie.org/news/0604-optical-beamformer-for-large-microwave-antenna-arrays?SSO=1#_=_> *
ZHANG MEILING; LIU XIAO; PANG RUI; HU GUIJUN: "Two-Dimensional Fiber Beamforming System Based on Mode Diversity", IEEE ACCESS, IEEE, USA, vol. 9, 26 February 2021 (2021-02-26), USA , pages 35968 - 35972, XP011842760, DOI: 10.1109/ACCESS.2021.3062670 *

Similar Documents

Publication Publication Date Title
WO2018153321A1 (fr) Procédé et appareil d&#39;attribution de poids en formation de faisceau (bf)
US11621757B2 (en) System and method for a multi-beam beamforming front-end architecture for wireless transceivers
JP6494755B2 (ja) アンテナビーム方向の調整可能なアンテナ装置
JP3564077B2 (ja) 光制御フェーズドアレイアンテナの位相制御装置および光制御フェーズドアレイアンテナ・システム
WO2019095490A1 (fr) Dispositif et procédé de formation de faisceau pour communication radio par fibre utilisant un réseau optique sélectif planaire
US7835768B2 (en) Antenna system and method for configuring a radiating pattern
US7511666B2 (en) Shared phased array cluster beamformer
CN107852397B (zh) 使用选择矩阵进行天线相位校准的混合波束形成天线阵列
JP6012873B2 (ja) 可変電気チルト付きマルチバンド・アンテナ
US11189911B2 (en) Compact combiner for phased-array antenna beamformer
JPH11127021A (ja) マルチビームフェーズドアレイアンテナシステム
US9748648B2 (en) Distributed feeding device for antenna beamforming
WO2021106043A1 (fr) Système de transmission radio, système de réception radio, appareil de station de base, système de communication radio et procédés de transmission et de réception radio
CN113451775B (zh) 光控射频相控阵集成控制系统以及波束形成方法
EP3131212B1 (fr) Systèmes et procédés de formation de faisceau analogique pour antennes de réseau à commande de phase à rayonnement direct
CN107615585A (zh) 一种相控阵芯片、相控阵波束扫描方法和装置
Belkin et al. Design and optimization of photonics-based beamforming networks for ultra-wide mm Wave-band antenna arrays
WO2022120856A1 (fr) Antenne de station de base et dispositif de station de base
WO2021106041A1 (fr) Système d&#39;émission sans fil, système de réception sans fil, dispositif de station de base, système de communication sans fil, procédé d&#39;émission sans fil et procédé de réception sans fil
WO2023242913A1 (fr) Dispositif de commande de directivité de transmission et procédé de commande
WO2023242921A1 (fr) Dispositif et procédé de commande de directivité d&#39;émission, système d&#39;émission
WO2023242920A1 (fr) Dispositif et procédé de commande de directivité de réception
Steeg et al. 2D mm-wave beam steering via optical true-time delay and leaky-wave antennas
WO2023242931A1 (fr) Dispositif de commande de directivité de transmission et procédé de commande de directivité de transmission
WO2023242932A1 (fr) Dispositif de commande de directivité de transmission et procédé de commande de directivité de transmission

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: 22946733

Country of ref document: EP

Kind code of ref document: A1