WO2022215119A1 - ビーム送信装置及びビーム送信方法 - Google Patents
ビーム送信装置及びビーム送信方法 Download PDFInfo
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- 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
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
- H04B10/112—Line-of-sight transmission over an extended range
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- 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
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
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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
- H04B7/04—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
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- the present invention relates to a beam transmission device and beam transmission method for transmitting a directional beam toward a beam reception device in a wireless communication system.
- Free space optical communication which uses highly directional beams for data transmission and reception, is being researched.
- a directional beam is transmitted from a beam transmitter provided in a transmitter to a beam receiver provided in a receiver.
- beam tracking is required to change the direction of the beam transmitted from the beam transmitter to the direction of the beam receiver in order to maintain communication.
- Non-Patent Document 1 discloses an optical wireless communication device capable of performing beam tracking to a moving beam receiver.
- the output of the beam transmitter is not completely parallel, but spreads with the transmission distance due to a minute divergence angle ⁇ .
- control information related to communication maintenance such as commands to the receiving device and notification of device information is transmitted using part of the main signal. That is, there is a possibility that the main signal and the control information will be lost due to a slight deviation of the optical axis.
- the loss of the main signal can be compensated for by retransmitting.
- the control information is lost, there is a possibility that the maintenance of communication itself will become impossible. Therefore, it is necessary to avoid the loss of control information rather than the main signal.
- the divergence angle is widened in order to facilitate acquisition of control information, it is resistant to optical axis misalignment due to changes in the position of the transmitting/receiving unit, but the signal power is reduced, resulting in a problem of lower main signal power.
- the present invention has been made to solve the above problems, and provides a beam transmission apparatus and a beam transmission method that can avoid the loss of control signals even when an axis shift occurs without impairing the received power of the main signal. intended to provide
- a first aspect relates to a beam transmitter for transmitting a directional beam towards a beam receiver in a wireless communication system.
- the beam transmitter includes a main signal generator, a control signal generator, a signal multiplexer, a divergence angle adjuster, and a beam controller.
- the main signal generator generates a main signal.
- a control signal generator periodically generates a control signal for maintaining communication with the beam receiver.
- a signal multiplexer multiplexes the main signal and the control signal.
- the divergence angle adjustment unit sets a target divergence angle to a first divergence angle during a period when the control signal is not included in the multiplexed signal, and sets the target divergence angle to a first divergence angle during a period when the control signal is included in the multiplexed signal. sets the target divergence angle to a second divergence angle that is greater than the first divergence angle.
- a beam controller changes the divergence angle of the beam modulated by the multiplexed signal to the target diver
- a second aspect relates to a beam transmission method for transmitting a directional beam toward a beam receiver in a wireless communication system.
- the beam transmission method includes a main signal generation process, a control signal generation process, a signal multiplexing process, a divergence angle adjustment process, and a beam control process.
- the main signal generating step generates a main signal.
- the control signal generating step periodically generates a control signal for maintaining communication with the beam receiving device.
- a signal multiplexing step multiplexes the main signal and the control signal.
- the divergence angle adjusting step sets a target divergence angle to a first divergence angle during a period in which the control signal is not included in the multiplexed signal, and sets the target divergence angle to a first divergence angle during a period in which the control signal is included in the multiplexed signal. sets the target divergence angle to a second divergence angle that is greater than the first divergence angle.
- a beam control step changes the divergence angle of the beam modulated with the multiplexed signal to the target divergence angle.
- the beam transmitter according to the present invention performs control to make the divergence angle of the transmission beam of the control signal related to communication maintenance larger than the divergence angle of the transmission beam of the main signal. Therefore, according to the present invention, it is possible to avoid the loss of the control signal when the axis shift occurs without degrading the received power of the main signal.
- FIG. 1 is a diagram showing a radio communication system according to Embodiment 1 of the present invention
- FIG. 2 is a block diagram illustrating an outline of functions of the beam transmission device according to Embodiment 1 of the present invention
- FIG. 4 is a diagram for explaining control of a beam divergence angle according to Embodiment 1 of the present invention
- FIG. 10 is a block diagram illustrating an outline of functions possessed by a beam transmission device according to Embodiment 2 of the present invention. It is a figure which shows the hardware structural example which each part of a beam transmitter has.
- FIG. 1 is a diagram showing a radio communication system according to a first embodiment.
- a directional beam 5 is transmitted from a beam transmitter 2 of a beam transmitter 1 to a beam receiver 4 of a beam receiver 3 .
- data is transmitted and received between the beam transmitter 1 and the beam receiver 3 .
- Beam 5 is a free space optical communication (FSO) signal.
- An FSO signal is an optical signal with a very high frequency, for example around 193 THz. By using the FSO signal, it is possible to perform communication with a beam having extremely high directivity compared to wireless signals in the millimeter wave band (up to 300 GHz).
- the beam 5 transmitted by the beam transmitter 2 is not limited to an optical signal such as an FSO signal, and may be a radio signal.
- FIG. 2 is a block diagram illustrating an overview of the functions of the beam transmission apparatus 1 according to the first embodiment.
- the beam transmitter 1 includes a main signal generator 10 , a control signal generator 11 , a signal multiplexer 12 , a divergence angle adjuster 20 and a beam controller 30 .
- the main signal generation unit 10 generates a main signal by applying modulation processing related to the modulation multilevel number and encoding processing related to error correction coding to the main information.
- the main information is, for example, user data, which is data unrelated to control for maintaining communication.
- the control signal generation unit 11 performs modulation processing related to the modulation multilevel number and encoding processing related to error correction coding to the control information, and periodically generates a control signal with lower received power than the main signal.
- the control information is data related to maintaining communication with the beam receiving device 3, such as commands to the beam receiving device 3 and notification of device information.
- the main signal and the control signal have different modulation multi-value numbers or error correction encoding coding rates.
- the signal multiplexing unit 12 multiplexes the main signal that has been modulated and encoded by the main signal generator 10 and the control signal that has been modulated and encoded by the control signal generator 11 .
- the signal multiplexer 12 outputs the multiplexed signal to the beam controller 30 .
- control of the beam divergence angle in the beam transmitter 1 according to Embodiment 1 will be described.
- the loss of the main signal can be compensated for by retransmitting, but if the control information is lost, the maintenance of communication itself may become impossible. Therefore, it is necessary to avoid loss of the control signal rather than the main signal.
- the beam transmitter 1 transmits the main signal and the control signal in a time division manner, and the divergence angle of the transmission beam of the control signal is made larger than the divergence angle of the transmission beam of the main signal.
- FIG. 3 is a diagram for explaining control of the beam divergence angle.
- the basic divergence angle (first divergence angle) is a divergence angle set to transmit the main signal with appropriate received power.
- the control signal divergence angle (second divergence angle) is a divergence angle set only in the control signal transmission section. Since the second angle of divergence is greater than the first angle of divergence, the received power of the control signal is lower than that of the main signal.
- the beam transmitter 1 widens the divergence angle only when transmitting the control signal, thereby making it easier for the beam receiver 3 to receive the control signal without greatly degrading the received power of the main signal.
- the divergence angle adjuster 20 sets the target divergence angle to the first divergence angle during a period when the control signal is not included in the multiplexed signal.
- the divergence angle adjuster 20 sets the target divergence angle to a second divergence angle larger than the first divergence angle during a period in which the control signal is included in the multiplexed signal.
- the second divergence angle is calculated based on the modulation multilevel number and the coding rate of error correction coding in the control signal generation unit 11 so that the received power of the control signal does not fall below the lower limit of receivable power.
- the divergence angle adjustment unit 20 includes a divergence angle calculation unit 21 and a divergence angle control unit 22 .
- the divergence angle calculator 21 calculates the divergence angle after control by the divergence angle controller 22 .
- the divergence angle calculator 21 calculates the amount of decrease [dB] in the required received power of the control signal with respect to the required received power of the main signal, based on the modulation multilevel number of the control signal and the coding rate of the error correction coding. do.
- the divergence angle calculator 21 determines, based on a predetermined relationship between the divergence angle and the amount of received power reduction, that the amount of decrease in received power due to the increase in divergence angle is within a range smaller than the calculated amount of decrease in required received power. to calculate the second divergence angle.
- the relationship between the divergence angle and the amount of decrease in received power may be determined by a theoretical formula, or may be determined by a correspondence table based on actual measurements or simulations.
- the divergence angle control unit 22 extracts the timing of transmitting the control signal from the signal multiplexing unit 12, and at that timing sets the target divergence angle to be larger than the first divergence angle at the time of main signal transmission and at the required reception of the control signal. Set the second divergence angle in the range that satisfies the power.
- the divergence angle control section 22 outputs an actuator control amount corresponding to the target divergence angle to the beam control section 30 .
- the beam control unit 30 changes the divergence angle of the beam modulated by the multiplexed signal to the target divergence angle.
- the beam control section 30 comprises a light source 31 , a modulator 32 , a spatial transmission section 33 and an optical signal focusing section 34 .
- the light source 31 outputs an optical carrier wave.
- the modulator 32 modulates the optical carrier with the signal multiplexed by the signal multiplexer 12 .
- the spatial transmission unit 33 emits the optical signal flowing through the fiber into space.
- the optical signal converging section 34 converges the light transmitted through the space.
- the optical signal focusing portion 34 comprises a liquid lens and an actuator that changes its radius of curvature.
- a liquid lens changes its focal length by changing the radius of curvature, and changes its divergence angle by changing the focal length.
- the optical signal converging section 34 electronically controls the radius of curvature of the liquid lens based on the actuator control amount from the divergence angle control section 22 .
- the optical signal converging section 34 may have two convex lenses and a position adjusting motor attached to one of the convex lenses.
- the two convex lenses produce a focal length as a composite lens, and the focal length can be changed by adjusting the distance between the two convex lenses with a position adjustment motor.
- the optical signal converging section 34 controls the position adjustment motor based on the actuator control amount from the divergence angle control section 22 .
- the divergence angle of the transmission beam of the control signal related to communication maintenance can be made larger than the divergence angle of the transmission beam of the main signal. Therefore, according to the present invention, it is possible to avoid the loss of the control signal without degrading the received power of the main signal even when the axis is misaligned. In addition, since this effect can be obtained only by controlling the beam transmitter 1, there is no need to change the configuration of the beam receiver 3, and it can be used together with various receiver configurations.
- FIG. 4 is a block diagram showing the configuration of the beam transmitter 1 according to Embodiment 2.
- the beam transmitter 1 according to Embodiment 2 is the same as that of Embodiment 1 except that a divergence angle transition adjustment unit 23 is added to the configuration of FIG. 2 described above. Descriptions of the same processing contents as in the first embodiment will be omitted or simplified below.
- the divergence angle of the transmission beam of the control signal can be made larger than the divergence angle of the transmission beam of the main signal.
- Embodiment 2 during divergence angle control, that is, during switching transition time, the modulation multilevel number of the main signal, the redundancy of error correction coding, or both are adjusted so that the divergence angle is larger than that during main signal transmission.
- the main signal can be demodulated even at the divergence angle.
- the divergence angle adjustment unit 20 includes a divergence angle transition adjustment unit 23 in addition to the divergence angle calculation unit 21 and the divergence angle control unit 22 described above.
- the divergence angle transition adjustment unit 23 adjusts at least one of the modulation multilevel number and the redundancy of error correction coding in the main signal generation unit 10 during the switching transition time between switching between the first divergence angle and the second divergence angle. to change
- the modulation multi-level number of the main signal is 16QAM
- the modulation multi-level number of the control signal is BPSK
- the divergence angle is changed from that for the main signal to that for the control signal
- 16QAM is used from the start of transition to t1, and then t2.
- t1, t2, and t3 may be arbitrarily determined within a range that satisfies the required reception power.
- the modulation multilevel number or the redundancy of error correction coding at the switching transition time may be included in the control signal as usual and notified, or may be changed for each cycle. Since there is no need, the information may be set in advance in the beam receiving device 3 before operation.
- At least one of the modulation multilevel number of the main signal and the redundancy of the error correction coding is adjusted at the switching transition time, and the main signal The main signal can be demodulated even if the divergence angle is larger than the divergence angle during transmission.
- FIG. 5 is a conceptual diagram showing a hardware configuration example of a processing circuit included in each part of the beam transmission device 1 of the embodiment described above. Each function described above is implemented by a processing circuit.
- the processing circuitry comprises at least one processor 91 and at least one memory 92 .
- the processing circuitry comprises at least one piece of dedicated hardware 93 .
- each function is implemented by software, firmware, or a combination of software and firmware. At least one of software and firmware is written as a program. At least one of software and firmware is stored in memory 92 .
- the processor 91 implements each function by reading out and executing a program stored in the memory 92 .
- the processing circuit may be, for example, a single circuit, multiple circuits, a programmed processor, or a combination thereof. Each function is realized by a processing circuit.
- Each function of the beam transmission device 1 may be configured partially or wholly by hardware, or may be configured as a program executed by a processor. That is, each function of the beam transmitter 1 can be realized by a computer and a program, and the program can be recorded on a recording medium or provided through a network.
- Beam control unit 31 beam transmitter 2 beam transmitter 3 beam receiver 4 beam receiver 5 beam 10 main signal generator 11 control signal generator 12 signal multiplexer 20 divergence angle adjuster 21 divergence angle calculator 22 divergence angle controller 23 divergence angle Transition adjustment unit 30 Beam control unit 31 Light source 32 Modulator 33 Spatial transmission unit 34 Optical signal convergence unit ⁇ Divergence angle
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Abstract
Description
ビーム送信装置は、主信号生成部、制御信号生成部、信号多重部、発散角調整部、およびビーム制御部を備える。
主信号生成部は、主信号を生成する。
制御信号生成部は、前記ビーム受信装置との通信維持に関わる制御信号を周期的に生成する。
信号多重部は、前記主信号および前記制御信号を多重する。
発散角調整部は、前記多重された信号に前記制御信号が含まれていない期間は、目標発散角を第1発散角に設定し、前記多重された信号に前記制御信号が含まれている期間は、前記目標発散角を前記第1発散角よりも大きい第2発散角に設定する。
ビーム制御部は、前記多重された信号で変調された前記ビームの発散角を前記目標発散角に変更する。
ビーム送信方法は、主信号生成工程、制御信号生成工程、信号多重工程、発散角調整工程、およびビーム制御工程を備える。
主信号生成工程は、主信号を生成する。
制御信号生成工程は、前記ビーム受信装置との通信維持に関わる制御信号を周期的に生成する。
信号多重工程は、前記主信号および前記制御信号を多重する。
発散角調整工程は、前記多重された信号に前記制御信号が含まれていない期間は、目標発散角を第1発散角に設定し、前記多重された信号に前記制御信号が含まれている期間は、前記目標発散角を前記第1発散角よりも大きい第2発散角に設定する。
ビーム制御工程は、前記多重された信号で変調された前記ビームの発散角を前記目標発散角に変更する。
1.無線通信システム
図1は、実施の形態1に係る無線通信システムを示す図である。無線通信システムにおいて、ビーム送信装置1のビーム送信部2からビーム受信装置3のビーム受信部4に向けて指向性のあるビーム5が送信される。これにより、ビーム送信装置1とビーム受信装置3との間でデータの送受信が行われる。
図2は、実施の形態1に係るビーム送信装置1が有する機能の概要を例示するブロック図である。ビーム送信装置1は、主信号生成部10、制御信号生成部11、信号多重部12、発散角調整部20、およびビーム制御部30を備える。
ところで、上述した実施の形態1では、制御信号と主信号とで、変調多値数または誤り訂正符号化の符号化率が違う前提で説明したが、制御信号と主信号とで変調速度が違う場合でも本発明は適用可能である。なお、この点は実施の形態2でも同様である。
次に、図4を参照して本発明の実施の形態2について説明する。
図4は、実施の形態2に係るビーム送信装置1の構成を示すブロック図である。実施の形態2に係るビーム送信装置1は、上述した図2の構成に発散角遷移時調整部23が追加されている点を除き、実施の形態1と同様である。以下、実施の形態1と同じ処理内容についてはその説明を省略または簡略する。
図5は、上述した実施の形態のビーム送信装置1の各部が有する処理回路のハードウェア構成例を示す概念図である。上述した各機能は処理回路により実現される。一態様として、処理回路は、少なくとも1つのプロセッサ91と少なくとも1つのメモリ92とを備える。他の態様として、処理回路は、少なくとも1つの専用のハードウェア93を備える。
2 ビーム送信部
3 ビーム受信装置
4 ビーム受信部
5 ビーム
10 主信号生成部
11 制御信号生成部
12 信号多重部
20 発散角調整部
21 発散角算出部
22 発散角制御部
23 発散角遷移時調整部
30 ビーム制御部
31 光源
32 変調器
33 空間送出部
34 光信号集束部
θ 発散角
Claims (7)
- 無線通信システムにおいてビーム受信装置に向けて指向性のビームを送信するビーム送信装置であって、
主信号を生成する主信号生成部と、
前記ビーム受信装置との通信維持に関わる制御信号を周期的に生成する制御信号生成部と、
前記主信号および前記制御信号を多重する信号多重部と、
前記多重された信号に前記制御信号が含まれていない期間は、目標発散角を第1発散角に設定し、前記多重された信号に前記制御信号が含まれている期間は、前記目標発散角を前記第1発散角よりも大きい第2発散角に設定する発散角調整部と、
前記多重された信号で変調された前記ビームの発散角を前記目標発散角に変更するビーム制御部と、
を備えることを特徴とするビーム送信装置。 - 前記制御信号生成部は、前記ビーム受信装置との通信維持に関わる制御情報に、変調多値数に関する変調処理および誤り訂正符号化に関する符号化処理を施して、前記主信号よりも受信電力が低い前記制御信号を周期的に生成し、
前記第2発散角は、前記制御信号生成部における前記変調多値数および前記誤り訂正符号化の符号化率に基づいて、前記制御信号の前記受信電力が受信可能下限電力を下回らないように算出されること、
を特徴とする請求項1に記載のビーム送信装置。 - 前記主信号生成部は、主情報に、変調多値数に関する変調処理と誤り訂正符号化に関する符号化処理とを施して、前記主信号を生成し、
前記発散角調整部はさらに、前記第1発散角と前記第2発散角とを切り替える間の切替遷移時間において、前記主信号生成部における前記変調多値数および、前記主信号生成部における前記誤り訂正符号化の冗長度の少なくとも1つを変更すること、
を特徴とする請求項1又は2に記載のビーム送信装置。 - 前記ビームは、光信号であること、
を特徴とする請求項1乃至3のいずれか1項に記載のビーム送信装置。 - 無線通信システムにおいてビーム受信装置に向けて指向性のビームを送信するビーム送信方法であって、
主信号を生成する主信号生成工程と、
前記ビーム受信装置との通信維持に関わる制御信号を周期的に生成する制御信号生成工程と、
前記主信号および前記制御信号を多重する信号多重工程と、
前記多重された信号に前記制御信号が含まれていない期間は、目標発散角を第1発散角に設定し、前記多重された信号に前記制御信号が含まれている期間は、前記目標発散角を前記第1発散角よりも大きい第2発散角に設定する発散角調整工程と、
前記多重された信号で変調された前記ビームの発散角を前記目標発散角に変更するビーム制御工程と、
を備えることを特徴とするビーム送信方法。 - 前記制御信号生成工程は、前記ビーム受信装置との通信維持に関わる制御情報に、変調多値数に関する変調処理および誤り訂正符号化に関する符号化処理を施して、前記主信号よりも受信電力が低い前記制御信号を周期的に生成し、
前記第2発散角は、前記制御信号生成工程における前記変調多値数および前記誤り訂正符号化の符号化率に基づいて、前記制御信号の前記受信電力が受信可能下限電力を下回らないように算出されること、
を特徴とする請求項5に記載のビーム送信方法。 - 前記主信号生成工程は、主情報に、変調多値数に関する変調処理と誤り訂正符号化に関する符号化処理とを施して、前記主信号を生成し、
前記発散角調整工程はさらに、前記第1発散角と前記第2発散角とを切り替える間の切替遷移時間において、前記主信号生成工程における前記変調多値数および、前記主信号生成工程における前記誤り訂正符号化の冗長度の少なくとも1つを変更すること、
を特徴とする請求項5又は6に記載のビーム送信方法。
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JP2016100855A (ja) * | 2014-11-26 | 2016-05-30 | 富士通株式会社 | 送信装置、受信装置および通信方法 |
US20180310322A1 (en) * | 2015-12-29 | 2018-10-25 | Huawei Technologies Co.,Ltd. | Downlink data transmission method and device |
JP2019503112A (ja) * | 2015-12-03 | 2019-01-31 | アイディーエーシー ホールディングス インコーポレイテッド | DFT−s OFDMおよびOFDMのゼロテールおよびユニークワードに基づく波形 |
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JP2016100855A (ja) * | 2014-11-26 | 2016-05-30 | 富士通株式会社 | 送信装置、受信装置および通信方法 |
JP2019503112A (ja) * | 2015-12-03 | 2019-01-31 | アイディーエーシー ホールディングス インコーポレイテッド | DFT−s OFDMおよびOFDMのゼロテールおよびユニークワードに基づく波形 |
US20180310322A1 (en) * | 2015-12-29 | 2018-10-25 | Huawei Technologies Co.,Ltd. | Downlink data transmission method and device |
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