WO2022137470A1 - Dispositif et procédé de réception - Google Patents

Dispositif et procédé de réception Download PDF

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Publication number
WO2022137470A1
WO2022137470A1 PCT/JP2020/048582 JP2020048582W WO2022137470A1 WO 2022137470 A1 WO2022137470 A1 WO 2022137470A1 JP 2020048582 W JP2020048582 W JP 2020048582W WO 2022137470 A1 WO2022137470 A1 WO 2022137470A1
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WO
WIPO (PCT)
Prior art keywords
oam mode
oam
mode
signal
separation circuit
Prior art date
Application number
PCT/JP2020/048582
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English (en)
Japanese (ja)
Inventor
康徳 八木
裕文 笹木
斗煥 李
貴之 山田
淳 増野
智貴 瀬本
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.)
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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/JP2020/048582 priority Critical patent/WO2022137470A1/fr
Priority to JP2022570917A priority patent/JP7485089B2/ja
Publication of WO2022137470A1 publication Critical patent/WO2022137470A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J1/00—Frequency-division multiplex systems

Definitions

  • This disclosure relates to a receiving device and a receiving method.
  • Radio waves with OAM have equiphase planes spirally distributed along the propagation direction around the propagation axis. Since the spatial phase distribution of each electromagnetic wave propagating in the same direction with different phase rotation speeds (OAM mode) is orthogonal in the rotation axis direction, the signals of each OAM mode modulated by different signal sequences should be separated on the receiving side. Therefore, it is possible to transmit multiple signals.
  • Non-Patent Document 1 the signals of each OAM mode can be separated only in the line-of-sight environment where the transmitting UCA and the receiving UCA are arranged at positions facing each other in the front and there is no reflected wave.
  • the transmitting UCA and the receiving UCA are fixedly installed at positions deviated from the front facing arrangement, and the influence of reflected waves due to the surrounding environment.
  • the channel matrix between the transmitting UCA and the receiving UCA deviates from the ideal front facing arrangement due to such an influence, the interference component between the OAM modes remains in the output stage of the OAM mode separation processing circuit on the receiving side.
  • the receiving side attempts to separate the signal in OAM mode 1
  • the transmitting UCA and the receiving UCA are in an ideal front facing arrangement
  • only the desired OAM mode signal component can be extracted.
  • the signal components of each OAM mode in the circuit output stage In addition, interference components from other OAM modes may be superimposed and the communication quality may deteriorate.
  • the purpose is to provide technology that can improve the transmission quality of OAM multiplex transmission.
  • the receiving device has an antenna that receives radio waves of a plurality of OAM (Orbital Angular Momentum) modes from the transmitting device, a separation circuit that separates each OAM mode signal received by the antenna, and the separation circuit. Based on the channel information of each OAM mode extracted based on the preamble signal of each OAM mode separated in, the first OAM mode of each OAM mode is selected, and the first OAM mode separated by the separation circuit is selected. Generation of generating a signal for the first OAM mode based on the signal of the OAM mode and the signal for the second OAM mode separated by the separation circuit and not used for receiving data from the transmitter. With a part.
  • OAM Orthogonal Angular Momentum
  • the transmission quality of OAM multiplex transmission can be improved.
  • FIG. 1 is a diagram illustrating a configuration of an OAM multiplex communication system 1 according to an embodiment.
  • the OAM multiplex communication system 1 has a transmitting station 10 (an example of a “transmitting device”) and a receiving station 20 (an example of a “receiving device”).
  • the transmitting station 10 includes a first transmitting UCA11-1 to an NTX transmitting UCA11-N TX as a transmitting antenna.
  • NTX is an integer of 1 or more.
  • a plurality of series of modulated signals transmitted in OAM modes 1 to L (1 to L are indexes indicating the order of the OAM mode) are input to the OAM mode transmission signal processing unit 13.
  • the rotation speed (order) of the phase of the radio wave having OAM is referred to as an OAM mode.
  • the OAM mode transmission signal processing unit 13 generates a signal to be transmitted in each OAM mode from each transmission UCA, and outputs the signal to the OAM mode generation processing units 12-1 to 12- NTX corresponding to each transmission UCA, respectively.
  • the OAM mode generation processing units 12-1 to 12-N TX input signals to be transmitted in OAM modes 1 to L, respectively, and transmit signals from each transmission UCA11-1 to 11-N TX as signals in OAM modes 1 to L, respectively.
  • the phase is adjusted so as to be output to the antenna element of each transmission UCA.
  • the receiving station 20 includes a first receiving UCA21-1 to an N RX receiving UCA21-N RX as a receiving antenna.
  • NRX is an integer of 1 or more.
  • the OAM mode separation processing unit 22-1 to 22-N RX (hereinafter, also simply referred to as "OAM mode separation processing unit 22" when it is not necessary to distinguish between them) is OAM from the received signal of each received UCA.
  • the signals of modes 1 to L are separated, and the signals of each OAM mode are output to the OAM mode reception signal generation unit 23.
  • L is the number of OAM modes to be used.
  • L 7, for example, signals of OAM mode -3, -2, -1, 0, 1, 2, 3 are multiplex transmitted, and one of them is referred to as OAM mode k.
  • k is an index indicating the OAM mode.
  • Each OAM mode separation processing unit 22 may separate each OAM mode signal by, for example, a Butler matrix circuit (Butler matrix; an example of a “separation circuit”) such as 8 ⁇ 8.
  • a Butler matrix circuit (Butler matrix; an example of a “separation circuit”) such as 8 ⁇ 8.
  • the OAM mode reception signal generation unit 23 (an example of the “generation unit”) is a quality-enhanced OAM mode signal from each OAM mode signal received from the OAM mode separation processing units 22-1 to 22- NRX . Generate a signal.
  • FIG. 2 is a diagram illustrating an example of UCA of the transmitting station 10 and the receiving station 20 according to the embodiment.
  • a plurality of first transmission UCA11-1 to N TX transmission UCA11-N TX of the transmission station 10 and first reception UCA21-1 to N RX reception UCA21-N RX of the reception station 20 are used.
  • a multi-circular array antenna (Multi-UCA) in which UCAs are arranged concentrically may be used.
  • Multi-UCA multi-circular array antenna
  • each UCA is shown as an example in which 16 antenna elements (indicated by ⁇ in the figure) are provided, the number of antenna elements of each UCA does not necessarily have to be the same.
  • FIG. 3 is a flowchart illustrating an example of processing of the OAM mode reception signal generation unit 23 of the reception station 20 according to the embodiment.
  • step S1 the OAM mode reception signal generation unit 23 acquires the channel (channel information) of each OAM mode separated by the OAM mode separation processing unit 22 from the orthogonal sequence preamble.
  • the OAM mode reception signal generation unit 23 may calculate the channel H by multiplying the preamble of the orthogonal sequence transmitted from the transmitting station 10 by a known orthogonal sequence. In this case, for example, when starting the transmission of data to the receiving station 20, the transmitting station 10 may first transmit the orthogonal series preamble signal to the receiving station 20.
  • the OAM mode reception signal generation unit 23 when the OAM mode reception signal generation unit 23 has an 8 ⁇ 8 butler matrix circuit, the OAM mode reception signal generation unit 23 extracts an 8 ⁇ 8 independent channel H as in the following equation (1). do.
  • L 8
  • a signal of OAM mode -3, -2, -1, 0, 1, 2, 3, 4 is input from the receiving UCA to the 8 ⁇ 8 Butler matrix circuit.
  • h ij is channel information from the transmission mode j to the reception mode i.
  • the signal of the component i ⁇ j also has power, so the power is measured. By doing so, the interference power can be obtained. Further, it is possible to know how much power is leaking from a certain transmission mode j to the reception mode i by the power of the signal of the component i ⁇ j.
  • the OAM mode reception signal generation unit 23 selects the OAM mode to be improved (an example of the "first OAM mode") based on the acquired channel (step S2).
  • the OAM mode reception signal generation unit 23 has SINR (Signal to Interference), which is the ratio of the sum of the noise power and the interference power to the reception power of the signal among the OAM modes separated by the OAM mode separation processing unit 22.
  • SINR Signal to Interference
  • the OAM mode in which plus Noise Ratio) is equal to or lower than the threshold value may be selected as the OAM mode to be improved.
  • the OAM mode reception signal generation unit 23 may select the OAM mode having the lowest SINR among the OAM modes as the OAM mode to be improved.
  • the OAM mode reception signal generation unit 23 selects the highest-order (largest absolute value of the mode) OAM mode among the OAM modes used for receiving data from the transmitting station 10 as the OAM mode to be improved. You may. As a result, it is possible to improve the high-order mode in which radio waves are difficult to reach far.
  • the signal of OAM mode -3, -2, -1, 0, 1, 2, 3, 4 is output from the 8 ⁇ 8 butler matrix circuit of the OAM mode separation processing unit 22, and the transmission station.
  • OAM mode-2, -1, 0, 1, 2 is used for receiving data from 10
  • the OAM mode reception signal generation unit 23 uses OAM mode-2, which is the highest order of the OAM modes used for reception.
  • 2 may be selected as the OAM mode to be improved.
  • the transmitting station 10 when the transmitting station 10 starts transmitting data to the receiving station 20, the transmitting station 10 first notifies the receiving station 20 of each OAM mode used by the transmitting station 10 for transmitting data to the receiving station 20 in advance. You may. Alternatively, for example, when the receiving station 20 starts receiving data from the transmitting station 10, the receiving station 20 first notifies the transmitting station 10 of each OAM mode used by the receiving station 20 for receiving data from the transmitting station 10 in advance. You may.
  • the OAM mode reception signal generation unit 23 selects a specific OAM mode (an example of the "second OAM mode") (step S3).
  • the OAM mode reception signal generation unit 23 specifies, for example, one or more OAM modes that are not used for receiving data from the transmission station 10 among the OAM modes separated by the OAM mode separation processing unit 22. It may be selected as the OAM mode of.
  • the signal of OAM mode -3, -2, -1, 0, 1, 2, 3, 4 is output from the 8 ⁇ 8 butler matrix circuit of the OAM mode separation processing unit 22, and the transmission station.
  • the OAM mode reception signal generation unit 23 sets the OAM mode -3, 3, 4 which is not used for the reception to the specific. It may be selected as the OAM mode.
  • the transmitting station 10 when the transmitting station 10 starts transmitting data to the receiving station 20, the transmitting station 10 first notifies the receiving station 20 of each OAM mode used by the transmitting station 10 for transmitting data to the receiving station 20 in advance. You may. Alternatively, for example, when the receiving station 20 starts receiving data from the transmitting station 10, the receiving station 20 first notifies the transmitting station 10 of each OAM mode used by the receiving station 20 for receiving data from the transmitting station 10 in advance. You may.
  • the power leaked (leaked) from the OAM mode to be improved is equal to or higher than the threshold value1.
  • the above OAM mode may be selected as the specific OAM mode.
  • the OAM mode reception signal generation unit 23 sets, for example, the OAM mode (reception mode i in which hiJ is the maximum) in which the power leaked from the OAM mode to be improved is the largest among the one or more reception modes i. It may be selected as a specific OAM mode.
  • the OAM mode reception signal generation unit 23 may select a specific OAM mode based on the order of the OAM mode to be improved among the OAM modes separated by the OAM mode separation processing unit 22, for example. good.
  • the OAM mode reception signal generation unit 23 selects, for example, the OAM mode closest to the order of the OAM mode to be improved among the one or more OAM modes not used for receiving data from the transmitting station 10. It may be selected as the mode. This is because it is considered that the OAM mode to be improved leaks most to the OAM mode in which the order is adjacent.
  • the signal of OAM mode -3, -2, -1, 0, 1, 2, 3, 4 is output from the 8 ⁇ 8 butler matrix circuit of the OAM mode separation processing unit 22, and the transmission station.
  • OAM mode-2, -1, 0, 1, 2 is used for receiving data from 10 and OAM mode-2 is set as the OAM mode to be improved
  • the OAM mode reception signal generation unit 23 is used for reception.
  • the OAM mode-3, 3 and 4 which do not exist, the OAM mode-3 having the closest order to the OAM mode-2 to be improved may be selected as the specific OAM mode.
  • the OAM mode reception signal generation unit 23 is based on the specific OAM mode signal received from the OAM mode separation processing unit 22 and the OAM mode signal to be improved received from the OAM mode separation processing unit 22. Then, the signal of the OAM mode to be improved is generated and output (step S4).
  • the OAM mode reception signal generation unit 23 generates a signal of the OAM mode of the improvement target by performing MIMO equalization processing based on, for example, the specific OAM mode and the OAM mode of the improvement target. You may.
  • the OAM mode reception signal generation unit 23 may use, for example, ZF (Zero-Forcing), MMSE (Mini-Mean Squared Error), MLD (Maximum Likelihood Detection), or the like as MIMO equalization processing.
  • ZF Zero-Forcing
  • MMSE Mini-Mean Squared Error
  • MLD Maximum Likelihood Detection
  • the OAM mode (unused OAM mode) that is conventionally terminated and not used is also available. It is possible to improve the SNR and improve the transmission efficiency by performing reception using the data and performing equalization processing between the desired OAM mode (OAM mode to be improved) and the unused OAM mode.
  • equalization processing is performed by utilizing the signal power leaked to the unused mode or the like.
  • the total SNR of the entire system is improved, so that the transmission quality of the OAM multiplex transmission can be improved.
  • OAM multiplex communication system 10 transmission station 11 transmission UCA 12 OAM mode generation processing unit 13 OAM mode transmission signal processing unit 20 Receiving station 21 Receiving UCA 22 OAM mode separation processing unit 23 OAM mode reception signal generation unit

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radio Transmission System (AREA)

Abstract

L'invention concerne un dispositif de réception comprenant : une antenne permettant de recevoir, d'un dispositif de transmission, une onde radio dans une pluralité de modes de moment angulaire orbital (OAM) ; un circuit de séparation permettant de séparer le signal de chaque mode OAM reçu par l'antenne ; et une unité de génération permettant de sélectionner un premier mode OAM parmi les modes OAM d'après les informations de canal de chaque mode OAM extraites d'après un signal de préambule de chaque mode OAM séparé par le circuit de séparation, ainsi que de générer un signal pour le premier mode OAM d'après le signal du premier mode OAM séparé par le circuit de séparation et le signal d'un second mode OAM séparé par le circuit de séparation et non utilisé pour la réception de données provenant du dispositif de transmission.
PCT/JP2020/048582 2020-12-24 2020-12-24 Dispositif et procédé de réception WO2022137470A1 (fr)

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PCT/JP2020/048582 WO2022137470A1 (fr) 2020-12-24 2020-12-24 Dispositif et procédé de réception
JP2022570917A JP7485089B2 (ja) 2020-12-24 2020-12-24 受信装置、及び受信方法

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Publication number Priority date Publication date Assignee Title
CN111133698B (zh) 2017-09-25 2022-02-01 日本电信电话株式会社 Oam多路复用通信系统和oam多路复用通信方法

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
SAKURAYA, ET AL: "Suppression of performance degradation due to misalignment in OAM multiplexing", IEICE TECHNICAL REPORT, 17 June 2020 (2020-06-17), pages 61 - 66, XP055951364 *
SUGANUMA HIROFUMI; SAITO SHUHEI; OGAWA KAYO; MAEHARA FUMIAKI: "Inter-Mode Interference Suppression Employing Even-Numbered Modes for UCA-Based OAM Multiplexing", 2019 IEEE GLOBECOM WORKSHOPS (GC WKSHPS), IEEE, 9 December 2019 (2019-12-09), pages 1 - 6, XP033735162, DOI: 10.1109/GCWkshps45667.2019.9024598 *

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