JP6962135B2 - OAM multiplex communication system and OAM multiplex communication method - Google Patents

OAM multiplex communication system and OAM multiplex communication method Download PDF

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JP6962135B2
JP6962135B2 JP2017211106A JP2017211106A JP6962135B2 JP 6962135 B2 JP6962135 B2 JP 6962135B2 JP 2017211106 A JP2017211106 A JP 2017211106A JP 2017211106 A JP2017211106 A JP 2017211106A JP 6962135 B2 JP6962135 B2 JP 6962135B2
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斗煥 李
裕文 笹木
浩之 福本
宏礼 芝
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Nippon Telegraph and Telephone Corp
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本発明は、電磁波の軌道角運動量（Orbital Angular Momentum：ＯＡＭ）を用いて無線信号を空間多重伝送するＯＡＭ多重通信システムおよびＯＡＭ多重通信方法に関する。 The present invention relates to an OAM multiplex communication system and an OAM multiplex communication method for spatially multiplex transmission of radio signals using the orbital angular momentum (OAM) of electromagnetic waves.

近年、伝送容量向上のため、ＯＡＭを用いた無線信号の空間多重伝送技術が報告されている（非特許文献１）。ＯＡＭをもつ電磁波は、伝搬軸を中心に伝搬方向にそって等位相面が螺旋状に分布する。異なるＯＡＭモードをもち、同一方向に伝搬する電磁波は、回転軸方向において空間位相分布が直交するため、異なる信号系列で変調された各ＯＡＭモー
ドの信号を受信局において分離することにより、信号を多重伝送することが可能である。 In recent years, in order to improve the transmission capacity, a spatial multiplex transmission technique for wireless signals using OAM has been reported (Non-Patent Document 1). Electromagnetic waves having OAM have equiphase planes spirally distributed along the propagation direction around the propagation axis. Since electromagnetic waves having different OAM modes and propagating in the same direction have orthogonal spatial phase distributions in the rotation axis direction, the signals are multiplexed by separating the signals of each OAM mode modulated by different signal sequences at the receiving station. It is possible to transmit.

このＯＡＭ多重技術を用いた無線通信システムでは、複数のアンテナ素子を等間隔に円形配置した等間隔円形アレーアンテナ（以下、ＵＣＡ（Uniform Circular Array）と称する。）を用い、複数のＯＡＭモードを生成・合成して送信することにより、異なる信号系列の空間多重伝送が行われる（非特許文献２）。 In a wireless communication system using this OAM multiplexing technology, a plurality of OAM modes are generated by using an evenly spaced circular array antenna (hereinafter referred to as UCA (Uniform Circular Array)) in which a plurality of antenna elements are arranged in a circle at equal intervals. -By synthesizing and transmitting, spatial multiplex transmission of different signal sequences is performed (Non-Patent Document 2).

図５は、ＯＡＭモードの信号を生成するためのＵＣＡの位相設定例を示す。
図５において、送信側におけるＯＡＭモード０，１，２，３，…の信号は、ＵＣＡの各アンテナ素子（●で示す）に設定する位相差により生成される。すなわち、ＯＡＭモードｎの信号は、ＵＣＡの位相がｎ回転（ｎ×360 度）になるように各アンテナ素子の位相を設定して生成する。例えば、ＵＣＡが８個のアンテナ素子で構成される場合で、ＯＡＭモード２の信号を生成する場合は、図５(3) に示すように、位相が２回転するように、各アンテナ素子に反時計回りに90度の位相差を設定する。なお、ＯＡＭモードｎの信号に対して位相の回転方向を逆にした信号をＯＡＭモード−ｎとする。例えば、正のＯＡＭモードの信号の位相の回転方向を反時計回りとし、負のＯＡＭモードの信号の位相の回転方向を時計回りとする。 FIG. 5 shows an example of UCA phase setting for generating an OAM mode signal.
In FIG. 5, the signals of OAM modes 0, 1, 2, 3, ... On the transmitting side are generated by the phase difference set in each antenna element (indicated by ●) of the UCA. That is, the signal of the OAM mode n is generated by setting the phase of each antenna element so that the phase of the UCA becomes n rotations (n × 360 degrees). For example, when the UCA is composed of eight antenna elements and the signal of OAM mode 2 is generated, as shown in FIG. 5 (3), the phase is counterclockwise so as to rotate twice. Set the phase difference by 90 degrees clockwise. The signal in which the rotation direction of the phase is reversed with respect to the signal in the OAM mode n is defined as the OAM mode −n. For example, the rotation direction of the phase of the positive OAM mode signal is counterclockwise, and the rotation direction of the phase of the negative OAM mode signal is clockwise.

異なる信号系列を異なるＯＡＭモードの信号として生成し、生成した信号を同時に送信することで、空間多重による無線通信ができる。送信側では、各ＯＡＭモードで伝送する信号をあらかじめ生成・合成し、単一のＵＣＡで各ＯＡＭモードの合成信号を送信してもよいし、複数のＵＣＡを用いて、ＯＡＭモード毎に異なるＵＣＡで各ＯＡＭモードの信号を送信してもよい。 By generating different signal sequences as signals in different OAM modes and simultaneously transmitting the generated signals, wireless communication by spatial multiplexing can be performed. On the transmitting side, signals to be transmitted in each OAM mode may be generated and synthesized in advance, and the combined signal of each OAM mode may be transmitted by a single UCA, or a plurality of UCAs may be used and different UCAs are used for each OAM mode. May transmit signals for each OAM mode.

図６は、ＯＡＭ多重信号の位相分布と信号強度分布の例を示す。
図６(1),(2) において、送信側から伝搬方向に直交する端面（以下、伝搬直交平面と称する。）で見た、ＯＡＭモード１とＯＡＭモード２の信号の位相分布を矢印で表す。矢印の始めは０度であり、位相が線形に変化して矢印の終わりは 360度である。すなわち、ＯＡＭモードｎの信号は、伝搬直交平面において、位相がｎ回転（ｎ×360 度）しながら伝搬する。 FIG. 6 shows an example of the phase distribution and the signal intensity distribution of the OAM multiplex signal.
In FIGS. 6 (1) and 6 (2), the phase distributions of the signals of OAM mode 1 and OAM mode 2 as seen from the end faces orthogonal to the propagation direction from the transmitting side (hereinafter referred to as the propagation orthogonal plane) are represented by arrows. .. The beginning of the arrow is 0 degrees, the phase changes linearly and the end of the arrow is 360 degrees. That is, the signal in OAM mode n propagates in the propagation orthogonal plane while the phase rotates n times (n × 360 degrees).

各ＯＡＭモードの信号は、ＯＡＭモード毎に信号強度分布と信号強度が最大になる位置が異なる。具体的には、ＯＡＭモードが高次になるほど、信号強度が最大になる位置が伝搬軸から遠くなる（非特許文献２）。ここで、ＯＡＭモードの値が大きい方を高次モードと称する。例えば、ＯＡＭモード３の信号は、ＯＡＭモード０、ＯＡＭモード１、ＯＡＭモード２の信号より、高次モードである。 The signal of each OAM mode has a different signal strength distribution and a position where the signal strength is maximized for each OAM mode. Specifically, the higher the OAM mode, the farther the position where the signal strength is maximized from the propagation axis (Non-Patent Document 2). Here, the one having a larger value in the OAM mode is referred to as a higher-order mode. For example, the signal in OAM mode 3 is a higher-order mode than the signals in OAM mode 0, OAM mode 1, and OAM mode 2.

図６(3) は、ＯＡＭモードごとに信号強度が最大になる位置を円環で示すが、ＯＡＭモードが高次になるほど信号強度が最大になる位置が中心軸から遠くなり、かつ伝搬距離に応じてＯＡＭモード多重信号のビーム径が広がり、ＯＡＭモードごとに信号強度が最大になる位置を示す円環が大きくなる。 FIG. 6 (3) shows the position where the signal strength is maximized in each OAM mode with a ring. The position where the signal strength is maximized becomes farther from the central axis and the propagation distance becomes higher as the OAM mode becomes higher. Correspondingly, the beam diameter of the OAM mode multiplex signal is widened, and the ring indicating the position where the signal strength is maximized becomes large in each OAM mode.

図７は、ＯＡＭ多重信号を分離するためのＵＣＡの位相設定例を示す。
図７において、受信側では、ＵＣＡの各アンテナ素子の位相を、送信側のアンテナ素子の位相と逆方向になるように設定し、各ＯＡＭモードの信号を分離する。すなわち、各アンテナ素子の位相は、図５の場合と逆方向に回転するように設定し、例えばＯＡＭモード２の信号を分離する場合は、位相が２回転するように、各アンテナ素子に時計回りに90度の位相差を設定する。 FIG. 7 shows an example of UCA phase setting for separating OAM multiplex signals.
In FIG. 7, on the receiving side, the phase of each antenna element of the UCA is set to be in the direction opposite to the phase of the antenna element on the transmitting side, and the signals of each OAM mode are separated. That is, the phase of each antenna element is set to rotate in the direction opposite to that in FIG. 5, and for example, when separating the OAM mode 2 signal, each antenna element is rotated clockwise so that the phase rotates twice. Set the phase difference to 90 degrees.

ＯＡＭ通信は、ＯＡＭモードの次数を高くすることにより、理論的には多重数を無限に増やすことができる。しかし、ＯＡＭモードが高次になるほど受信電力が低下するため（非特許文献３）、現実的に使えるＯＡＭモードの数には制限がある。例えば、ＯＡＭモード±２までは所望の受信電力を満たすが、ＯＡＭモード±３より高いＯＡＭモードは所望の受信電力を満たさない場合には、使えるＯＡＭモードが２，１，０，−１，−２の５つに制限されることになる。 In OAM communication, the number of multiplexes can theoretically be increased infinitely by increasing the order of the OAM mode. However, since the received power decreases as the OAM mode becomes higher (Non-Patent Document 3), the number of OAM modes that can be practically used is limited. For example, if the desired received power is satisfied up to OAM mode ± 2, but the desired received power is not satisfied in the OAM mode higher than OAM mode ± 3, the available OAM modes are 2,1,0, -1, −. It will be limited to 5 of 2.

一方、図８に示すように、同心円状に複数のＵＣＡを配置したＭ（Multi)−ＵＣＡを用い、ＵＣＡ毎に所要の受信電力を満たすＯＡＭモードを使うことで、多重数を増やすことができる。例えば互いに半径が異なる４個のＵＣＡ１，ＵＣＡ２，ＵＣＡ３，ＵＣＡ４を用い、各ＵＣＡがＯＡＭモード２，１，０，−１，−２を用いてそれぞれ異なる信号列を５多重伝送すると、４個のＵＣＡの合計で20多重伝送が可能となる。この場合、ＯＡＭモード間の独立な特性により、各ＵＣＡの異なるＯＡＭモード間では干渉が生じないが、各ＵＣＡの同一のＯＡＭモード間では受信側にて干渉が生じるため、等化処理等により同一ＯＡＭモード間の信号を分離する必要がある。 On the other hand, as shown in FIG. 8, the number of multiplex can be increased by using M (Multi) -UCA in which a plurality of UCAs are arranged concentrically and using the OAM mode that satisfies the required received power for each UCA. .. For example, if four UCA1, UCA2, UCA3, and UCA4 having different radii are used, and each UCA uses OAM mode 2,1,0, -1, -2 to transmit five different signal sequences, four UCAs are transmitted. A total of 20 multiplex transmissions of UCA are possible. In this case, due to the independent characteristics between the OAM modes, interference does not occur between different OAM modes of each UCA, but interference occurs between the same OAM modes of each UCA on the receiving side, so that they are the same due to equalization processing or the like. It is necessary to separate the signals between the OAM modes.

すなわち、Ｍ−ＵＣＡを構成するｍ個のＵＣＡは、それぞれｎ個のＯＡＭモードの信号を生成し、それらを同時に送信することにより、ｍ×ｎの時系列データ（ストリーム）を空間多重して伝送することができる。上記の例では、送信側から４個のＵＣＡと５個のＯＡＭモードを用いて20ストリームの多重伝送を行った場合に、受信側では４個のＵＣＡで受信するＯＡＭモード２，１，０，−１，−２ごとに４個のストリームの分離処理を行うことで、20ストリームの信号を分離することができる。これにより、高次ＯＡＭモードを使わず、複数のＵＣＡで低次ＯＡＭモードを複数送信し、同じＯＡＭモード間のみで信号分離処理を行うことで、多重数を増やし、伝送容量を向上することができる。 That is, each of the m UCAs constituting the M-UCA generates n OAM mode signals, and by transmitting them at the same time, the m × n time series data (stream) is spatially multiplexed and transmitted. can do. In the above example, when 20 streams are multiplexed from the transmitting side using 4 UCAs and 5 OAM modes, the receiving side receives OAM modes 2, 1, 0, with 4 UCAs. By performing the separation processing of 4 streams for each -1 and -2, the signals of 20 streams can be separated. As a result, it is possible to increase the number of multiplex and improve the transmission capacity by transmitting multiple low-order OAM modes with multiple UCAs and performing signal separation processing only between the same OAM modes without using the high-order OAM mode. can.

以下、単一のＵＣＡを用いた伝送方法を「ＯＡＭ通信」と称し、Ｍ−ＵＣＡを用いた伝送方法を「ＯＡＭ−ＭＩＭＯ通信」と称する。 Hereinafter, the transmission method using a single UCA will be referred to as "OAM communication", and the transmission method using M-UCA will be referred to as "OAM-MIMO communication".

J. Wang et al., “Terabit free-space data transmission employing orbital angular momentum multiplexing, ”Nature Photonics, Vol.6, pp.488-496, July 2012.J. Wang et al., “Terabit free-space data transmission reagents orbital angular momentum multiplexing,” Nature Photonics, Vol.6, pp.488-496, July 2012. Y. Yan et al.,“High-capacity millimeter-wavecommunications with orbital angular momentum multiplexing,”Nature Commun., vol.5, p.4876, Sep. 2014.Y. Yan et al., “High-capacity millimeter-wavecommunications with orbital angular momentum multiplexing,” Nature Commun., Vol.5, p.4876, Sep. 2014. A. Cagliero et al., “A New Approach to the Link Budget Concept for an OAM Communication Link,”IEEE Antennas and Wireless Propagation Letters, vol.15, pp.568-571. 2016A. Cagliero et al., “A New Approach to the Link Budget Concept for an OAM Communication Link,” IEEE Antennas and Wireless Propagation Letters, vol.15, pp.568-571. 2016

（ＯＡＭ通信における課題）
ＯＡＭ通信では、各ＯＡＭモードは独立のため、ＯＡＭモード間干渉除去は理論的には不要である。しかし、送受信ＵＣＡの軸ズレやＲＦ回路の不完全性等により、ＯＡＭモード間で干渉が生じる場合には、このＯＡＭモード間干渉を除去する必要が生じる。この干渉除去法として、各ＯＡＭモードの送信ストリームを従来のＭＩＭＯ通信の各ストリームとしてみなし、従来のＭＩＭＯ等化技術等で干渉除去を行う手法が考えられる。 (Issues in OAM communication)
In OAM communication, since each OAM mode is independent, interference elimination between OAM modes is theoretically unnecessary. However, when interference occurs between OAM modes due to axis misalignment of the transmission / reception UCA, imperfections of the RF circuit, etc., it becomes necessary to eliminate the interference between OAM modes. As this interference removing method, a method is conceivable in which the transmission stream of each OAM mode is regarded as each stream of the conventional MIMO communication, and the interference is removed by the conventional MIMO equalization technology or the like.

しかしながら、この干渉除去法では、多重数が増加すると演算量が多重数の３乗に比例し増加する課題がある。また、この干渉除去法の適用のためには、各ＯＡＭモードから他のすべてのＯＡＭモードへの干渉の度合い、すなわちチャネル情報を取得する必要が生じる。そのため、多重数の増加に伴ってチャネル推定の負荷が多重数の２乗に比例して生じる課題がある。例えば、５個のＯＡＭモードを用いて多重通信を行う場合、25個のチャネル情報の取得が必要となる。 However, this interference elimination method has a problem that the amount of calculation increases in proportion to the cube of the multiple number as the number of multiplex increases. Further, in order to apply this interference elimination method, it becomes necessary to acquire the degree of interference from each OAM mode to all other OAM modes, that is, channel information. Therefore, there is a problem that the load of channel estimation is proportional to the square of the number of multiples as the number of multiples increases. For example, when performing multiplex communication using five OAM modes, it is necessary to acquire 25 channel information.

この干渉除去に必要な演算量の増加に対して受信装置の演算能力が一定の場合、送受信可能多重数が制限されて、伝送容量が低下する課題がある。また、一般的に、チャネル情報の取得は、送信装置が既知信号を送り、受信装置がその既知信号を用いてチャネル推定を行う。そのため、既知情報の量が増えると、送受信するデータ量が減ることになって伝送容量が低下することになる。また、チャネル推定に必要な演算量も増加する課題がある。また、干渉の度合いを周期的に把握し干渉除去処理を適応的に行う必要がある。 When the computing power of the receiving device is constant with respect to the increase in the amount of computing required for removing the interference, there is a problem that the number of transmit and receive multiplex is limited and the transmission capacity is reduced. Further, in general, in the acquisition of channel information, the transmitting device sends a known signal, and the receiving device estimates the channel using the known signal. Therefore, as the amount of known information increases, the amount of data to be transmitted and received decreases, and the transmission capacity decreases. In addition, there is a problem that the amount of calculation required for channel estimation also increases. In addition, it is necessary to periodically grasp the degree of interference and perform the interference removal process adaptively.

（ＯＡＭ−ＭＩＭＯ通信における課題）
送受信装置がそれぞれ、Ｍ−ＵＣＡを用いて多重伝送を行うＯＡＭ−ＭＩＭＯ通信では、理論的には、同一のＯＡＭモード間の信号分離処理のみで、すべてのストリームの分離が可能である。ここで、同一のＯＡＭモード間の信号分離処理は、同一のＯＡＭモード間のチャネル情報を用いて、ＺＦ(zero forcing)やＭＭＳＥ(minimum mean square error) 手法など一般的に使われる等化手法と、ＭＬＤ（Maximum likelihood decoding)、ＭＤＤ（Minimum distance decoding)、ＶＤ（Viterbi decoder ）等の無線通信システムにおいて、一般的に用いられる等化・分離手法が想定される。 (Issues in OAM-MIMO communication)
In OAM-MIMO communication in which each transmitter / receiver performs multiplex transmission using M-UCA, theoretically, all streams can be separated only by signal separation processing between the same OAM modes. Here, the signal separation processing between the same OAM modes is performed by using the channel information between the same OAM modes as a commonly used equalization method such as ZF (zero forcing) or MMSE (minimum mean square error) method. , MLD (Maximum likelihood decoding), MDD (Minimum distance decoding), VD (Viterbi decoder) and other wireless communication systems, an equalization / separation method generally used is assumed.

しかしながら、軸ズレやＲＦ回路等によりＯＡＭモード間干渉が生じると、同一ＯＡＭモード間の信号分離以外にも、ＯＡＭ通信における課題と同様に、異なるＯＡＭモード間の干渉除去処理を行う必要が生じる。この干渉除去法として、Ｍ−ＵＣＡの各ＯＡＭモードの送信ストリームを従来のＭＩＭＯ通信の各ストリームとしてみなし、従来のＭＩＭＯ等化技術等で干渉除去を行う手法が考えられる。しかしながら、この干渉除去法では、ＯＡＭ通信における課題と同様に、多重数が増加すると演算量が多重数の３乗に比例し増加し、チャネル推定の負荷が多重数の２乗に比例して増加する課題がある。これらにより、伝送容量が低下する課題がある。また、干渉の度合いを周期的に把握し干渉除去処理を適応的に行う必要がある。 However, when interference between OAM modes occurs due to axis misalignment, an RF circuit, or the like, it becomes necessary to perform interference elimination processing between different OAM modes in addition to signal separation between the same OAM modes, as in the problem of OAM communication. As this interference removing method, a method is conceivable in which the transmission stream of each OAM mode of M-UCA is regarded as each stream of the conventional MIMO communication, and the interference is removed by the conventional MIMO equalization technique or the like. However, in this interference elimination method, as in the problem of OAM communication, when the number of multiples increases, the amount of calculation increases in proportion to the cube of the number of multiples, and the load of channel estimation increases in proportion to the square of the number of multiples. There is a problem to be done. As a result, there is a problem that the transmission capacity is reduced. In addition, it is necessary to periodically grasp the degree of interference and perform the interference removal process adaptively.

このように、ＯＡＭ通信およびＯＡＭ−ＭＩＭＯ通信において、ＯＡＭモード間干渉が生じる場合、多重数の増加に伴いＯＡＭモード間干渉除去に必要な演算量が増加する。また、ＯＡＭモード間干渉除去のため必要なチャネル推定負荷も増加する。 As described above, when interference between OAM modes occurs in OAM communication and OAM-MIMO communication, the amount of calculation required for removing interference between OAM modes increases as the number of multiplexes increases. It also increases the channel estimation load required to eliminate interference between OAM modes.

本発明は、ＯＡＭ通信およびＯＡＭ−ＭＩＭＯ通信において、ＯＡＭモード間干渉が生じる場合に、多重数の増加に伴いＯＡＭモード間干渉除去に必要な演算量を削減し、さらにＯＡＭモード間干渉除去に必要なチャネル推定負荷も軽減することができるＯＡＭ多重通信システムおよびＯＡＭ多重通信方法を提供することを目的とする。 INDUSTRIAL APPLICABILITY The present invention reduces the amount of calculation required for removing interference between OAM modes as the number of multiplexes increases when interference between OAM modes occurs in OAM communication and OAM-MIMO communication, and is further required for removing interference between OAM modes. It is an object of the present invention to provide an OAM multiplex communication system and an OAM multiplex communication method capable of reducing a various channel estimation load.

第１−１の発明は、送信装置のＵＣＡで複数のＯＡＭモードの信号を生成して送信し、受信装置のＵＣＡで複数のＯＡＭモードの信号を受信して分離し、ＯＡＭモード数の信号を空間多重伝送するＯＡＭ多重通信システムにおいて、受信装置は、ＯＡＭモード間のチャネル情報を用いて、所定の閾値１より大きい干渉を及ぼすＯＡＭモード間を判定し、該所定の閾値１より大きい干渉を及ぼすＯＡＭモード組数に応じて指定されたＯＡＭモード間の干渉除去処理を行う干渉除去手段を備える。 Invention of the first-1, generates a plurality of OAM mode signals in UCA transmission device transmits, receives and separates the plurality of OAM mode signals in UCA receiver, the OAM mode number of signals In the OAM multiplex communication system for spatial multiplex transmission, the receiving device uses the channel information between the OAM modes to determine between the OAM modes that cause interference greater than a predetermined threshold value 1, and exerts interference greater than the predetermined threshold value 1. An interference removing means for performing interference removing processing between OAM modes specified according to the number of OAM mode sets is provided.

第１−２の発明は、送信装置のＵＣＡで複数のＯＡＭモードの信号を生成して送信し、受信装置のＵＣＡで複数のＯＡＭモードの信号を受信して分離し、ＯＡＭモード数の信号を空間多重伝送するＯＡＭ多重通信システムにおいて、受信装置は、ＯＡＭモード間のチャネル情報を用いて、所定の閾値１より大きい干渉を及ぼすＯＡＭモード間を判定し、そのＯＡＭモード間の干渉除去処理を行う干渉除去手段を備え、干渉除去手段は、各ＯＡＭモード間の干渉信号電力を計算し、その最大干渉信号電力が所定の閾値１以下の場合は、ＯＡＭモード間の干渉除去処理を行わずに、各ＯＡＭモードの受信信号の復調処理を行う処理手段１と、各ＯＡＭモード間の干渉信号電力を計算し、その干渉信号電力が閾値１より大きいＯＡＭモード組数が所定の閾値２以下の場合は、干渉信号電力が閾値１以下のＯＡＭモード間を除くＯＡＭモード間のみの干渉除去処理を行い、各ＯＡＭモードの受信信号の復調処理を行う処理手段２と、各ＯＡＭモード間の干渉信号電力を計算し、その干渉信号電力が閾値１より大きいＯＡＭモード組数が所定の閾値２より大きい場合は、各ＯＡＭモードのすべての受信信号とすべてのＯＡＭモード間のチャネル情報を用いて干渉除去処理を行い、各ＯＡＭモードの受信信号の復調処理を行う処理手段３とを備える。 In the first and second inventions, a plurality of OAM mode signals are generated and transmitted by the UCA of the transmitting device, and a plurality of OAM mode signals are received and separated by the UCA of the receiving device, and the signals of the number of OAM modes are transmitted. In the OAM multiplex communication system for spatial multiplex transmission, the receiving device uses the channel information between the OAM modes to determine between the OAM modes that cause interference larger than a predetermined threshold value 1, and performs interference elimination processing between the OAM modes. The interference removing means is provided, and the interference removing means calculates the interference signal power between each OAM mode, and when the maximum interference signal power is equal to or less than a predetermined threshold value 1, the interference removing processing between the OAM modes is not performed. When the processing means 1 that demolishes the received signal of each OAM mode and the interference signal power between each OAM mode are calculated and the number of OAM mode sets whose interference signal power is larger than the threshold value 1 is equal to or less than a predetermined threshold value 2. , Interference signal power between the processing means 2 that performs interference removal processing only between OAM modes except between OAM modes whose interference signal power is a threshold value of 1 or less and demolishes the received signal of each OAM mode, and each OAM mode. When the number of OAM mode sets whose interference signal power is larger than the threshold value 1 is larger than the predetermined threshold value 2, the interference removal process is performed using all the received signals in each OAM mode and the channel information between all OAM modes. It is provided with a processing means 3 for performing the demodulation processing of the received signal in each OAM mode.

第１−３の発明は、送信装置のＵＣＡで複数のＯＡＭモードの信号を生成して送信し、受信装置のＵＣＡで複数のＯＡＭモードの信号を受信して分離し、ＯＡＭモード数の信号を空間多重伝送するＯＡＭ多重通信システムにおいて、受信装置は、ＯＡＭモード間のチャネル情報を用いて、所定の閾値１より大きい干渉を及ぼすＯＡＭモード間を判定し、そのＯＡＭモード間の干渉除去処理を行う干渉除去手段を備え、干渉除去手段は、所定の時間間隔ごとにすべてのＯＡＭモード間のチャネル情報を取得し、その区間は、所定の閾値１より大きい干渉を及ぼすＯＡＭモード間のみのチャネル情報を取得する構成である。 In the first to third inventions, the UCA of the transmitting device generates and transmits a plurality of OAM mode signals, and the UCA of the receiving device receives and separates the plurality of OAM mode signals, and outputs the signals of the number of OAM modes. In the OAM multiplex communication system for spatial multiplex transmission, the receiving device uses the channel information between the OAM modes to determine between the OAM modes that cause interference larger than a predetermined threshold value 1, and performs interference elimination processing between the OAM modes. The interference removing means includes the interference removing means, and the interference removing means acquires the channel information between all the OAM modes at a predetermined time interval, and the interval obtains the channel information only between the OAM modes which causes interference larger than a predetermined threshold 1. It is a configuration to acquire.

第２の発明は、同心円状に配置した複数のＵＣＡからなるＭ−ＵＣＡを送信装置と受信装置に備え、送信装置の各ＵＣＡでそれぞれ複数のＯＡＭモードの信号を生成して送信し、受信装置の各ＵＣＡでそれぞれ複数のＯＡＭモードの信号を受信して分離し、ＵＣＡ数×ＯＡＭモード数の信号を空間多重伝送するＯＡＭ多重通信システムにおいて、受信装置は、送信装置は各ＵＣＡの各ＯＡＭモード間のチャネル情報を用いて、各ＵＣＡで受信する同一ＯＡＭモード間の信号分離を行うとともに、所定の閾値３より大きい干渉を及ぼすＯＡＭモード間を判定し、そのＯＡＭモード間の干渉除去処理を行う干渉除去手段を備える。 In the second invention, an M-UCA composed of a plurality of UCAs arranged concentrically is provided in a transmitting device and a receiving device, and each UCA of the transmitting device generates and transmits a plurality of OAM mode signals, and the receiving device. In the OAM multiplex communication system in which each UCA receives and separates a plurality of OAM mode signals and spatially multiplex-transmits a signal of the number of UCA × the number of OAM modes, the receiving device and the transmitting device are each OAM mode of each UCA. Using the channel information between them, the signals are separated between the same OAM modes received by each UCA, the OAM modes that cause interference larger than a predetermined threshold value 3 are determined, and the interference elimination processing between the OAM modes is performed. Provided with interference removing means.

第２の発明のＯＡＭ多重通信システムにおいて、干渉除去手段は、複数のＵＣＡの各ＯＡＭモード間の干渉信号電力を計算し、その最大干渉信号電力が所定の閾値３以下の場合は、ＯＡＭモード間の干渉除去処理を行わずに、各ＵＣＡにおける同一ＯＡＭモード間の等化処理による信号分離処理を行い、分離後の各ＯＡＭモードの受信信号の復調処理を行う処理手段１と、複数のＵＣＡの各ＯＡＭモード間の干渉信号電力を計算し、その干渉信号電力が閾値３より大きいＯＡＭモード組数が所定の閾値４以下の場合は、干渉信号電力が閾値３以下のＯＡＭモード間を除くＯＡＭモード間のみの干渉除去処理を行い、各ＵＣＡの各ＯＡＭモードの受信信号の復調処理を行う処理手段２と、複数のＵＣＡの各ＯＡＭモード間の干渉信号電力を計算し、その干渉信号電力が閾値３より大きいＯＡＭモード組数が所定の閾値４より大きい場合は、各ＵＣＡの各ＯＡＭモードのすべての受信信号と、すべてＵＣＡのＯＡＭモード間のチャネル情報を用いて干渉除去処理を行い、各ＵＣＡの各ＯＡＭモードの受信信号の復調処理を行う処理手段３とを備える。 In the OAM multiplex communication system of the second invention, the interference removing means calculates the interference signal power between each OAM mode of a plurality of UCAs, and when the maximum interference signal power is 3 or less a predetermined threshold value, between the OAM modes. A processing means 1 that performs signal separation processing by equalization processing between the same OAM modes in each UCA and demolishes the received signal of each OAM mode after separation, and a plurality of UCAs. The interference signal power between each OAM mode is calculated, and when the number of OAM mode sets whose interference signal power is larger than the threshold 3 is 4 or less, the OAM mode excluding the OAM modes whose interference signal power is 3 or less is the threshold. Interference signal power between the processing means 2 that performs interference removal processing only between UCAs and demolishes the received signal of each OAM mode of each UCA and each OAM mode of a plurality of UCAs is calculated, and the interference signal power is the threshold value. When the number of OAM mode sets larger than 3 is larger than the predetermined threshold value 4, interference elimination processing is performed using all received signals of each OAM mode of each UCA and channel information between all OAM modes of UCA, and each UCA is performed. The processing means 3 for demolishing the received signal of each OAM mode of the above is provided.

第２の発明のＯＡＭ多重通信システムにおいて、干渉除去手段は、所定の時間間隔ごとにすべてのＯＡＭモード間のチャネル情報を取得し、その区間は、所定の閾値３より大きい干渉を及ぼすＯＡＭモード間のみのチャネル情報を取得する構成である。 In the OAM multiplex communication system of the second invention, the interference removing means acquires channel information between all OAM modes at predetermined time intervals, and the interval is between OAM modes that causes interference larger than a predetermined threshold value 3. It is a configuration to acquire only channel information.

第３−１の発明は、送信装置のＵＣＡで複数のＯＡＭモードの信号を生成して送信し、受信装置のＵＣＡで複数のＯＡＭモードの信号を受信して分離し、ＯＡＭモード数の信号を空間多重伝送するＯＡＭ多重通信方法において、受信装置は、ＯＡＭモード間のチャネル情報を用いて、所定の閾値１より大きい干渉を及ぼすＯＡＭモード間を判定し、該所定の閾値１より大きい干渉を及ぼすＯＡＭモード組数に応じて指定されたＯＡＭモード間の干渉除去処理を行う。
第３−２の発明は、送信装置のＵＣＡで複数のＯＡＭモードの信号を生成して送信し、受信装置のＵＣＡで複数のＯＡＭモードの信号を受信して分離し、ＯＡＭモード数の信号を空間多重伝送するＯＡＭ多重通信方法において、受信装置は、ＯＡＭモード間のチャネル情報を用いて、所定の閾値１より大きい干渉を及ぼすＯＡＭモード間を判定し、そのＯＡＭモード間の干渉除去処理を行った上で、各ＯＡＭモードの受信信号の復調処理を行い、干渉除去処理では、各ＯＡＭモード間の干渉信号電力を計算し、計算された最大干渉信号電力が所定の閾値１以下の場合は、ＯＡＭモード間の干渉除去処理を行わず、計算された干渉信号電力が閾値１より大きいＯＡＭモード組数が所定の閾値２以下の場合は、干渉信号電力が閾値１以下のＯＡＭモード間を除くＯＡＭモード間のみの干渉除去処理を行い、計算された干渉信号電力が閾値１より大きいＯＡＭモード組数が所定の閾値２より大きい場合は、各ＯＡＭモードのすべての受信信号とすべてのＯＡＭモード間のチャネル情報を用いて干渉除去処理を行う。
第３−３の発明は、送信装置のＵＣＡで複数のＯＡＭモードの信号を生成して送信し、受信装置のＵＣＡで複数のＯＡＭモードの信号を受信して分離し、ＯＡＭモード数の信号を空間多重伝送するＯＡＭ多重通信方法において、受信装置は、ＯＡＭモード間のチャネル情報を用いて、所定の閾値１より大きい干渉を及ぼすＯＡＭモード間を判定し、そのＯＡＭモード間の干渉除去処理を行い、干渉除去処理では、所定の時間間隔ごとにすべてのＯＡＭモード間のチャネル情報を取得し、その区間は、所定の閾値１より大きい干渉を及ぼすＯＡＭモード間のみのチャネル情報を取得する。 Invention of the third -1 generates a plurality of OAM mode signals in UCA transmission device transmits, receives and separates the plurality of OAM mode signals in UCA receiver, the OAM mode number of signals In the OAM multiplex communication method of spatial multiplex transmission, the receiving device uses the channel information between the OAM modes to determine between the OAM modes that cause interference greater than a predetermined threshold value 1, and exerts interference greater than the predetermined threshold value 1. Interference removal processing between OAM modes specified according to the number of OAM mode sets is performed.
In the third invention, a plurality of OAM mode signals are generated and transmitted by the UCA of the transmitting device, and a plurality of OAM mode signals are received and separated by the UCA of the receiving device, and the signals of the number of OAM modes are transmitted. In the OAM multiplex communication method of spatial multiplex transmission, the receiving device uses the channel information between the OAM modes to determine between the OAM modes that cause interference larger than a predetermined threshold value 1, and performs interference elimination processing between the OAM modes. After that, the received signal of each OAM mode is demolished, and in the interference elimination process, the interference signal power between each OAM mode is calculated. If the calculated maximum interference signal power is 1 or less than a predetermined threshold value, When the number of OAM mode sets whose calculated interference signal power is larger than the threshold value 1 is equal to or less than the predetermined threshold value 2 without performing the interference removal processing between the OAM modes, the OAM excluding the OAM modes whose interference signal power is equal to or less than the threshold value 1 Interference removal processing is performed only between modes, and when the calculated interference signal power is larger than the threshold value 1 and the number of OAM mode sets is larger than the predetermined threshold value 2, all the received signals in each OAM mode and all OAM modes are used. Interference removal processing is performed using the channel information.
In the third invention, the UCA of the transmitting device generates and transmits a plurality of OAM mode signals, the UCA of the receiving device receives and separates the plurality of OAM mode signals, and the signals of the number of OAM modes are transmitted. In the OAM multiplex communication method of spatial multiplex transmission, the receiving device uses the channel information between the OAM modes to determine between the OAM modes that cause interference larger than a predetermined threshold value 1, and performs interference elimination processing between the OAM modes. In the interference removal process, channel information between all OAM modes is acquired at predetermined time intervals, and the section acquires channel information only between OAM modes that cause interference larger than a predetermined threshold value 1.

第４の発明は、同心円状に配置した複数のＵＣＡからなるＭ−ＵＣＡを送信装置と受信装置に備え、送信装置の各ＵＣＡでそれぞれ複数のＯＡＭモードの信号を生成して送信し、受信装置の各ＵＣＡでそれぞれ複数のＯＡＭモードの信号を受信して分離し、ＵＣＡ数×ＯＡＭモード数の信号を空間多重伝送するＯＡＭ多重通信方法において、受信装置は、送信装置は各ＵＣＡの各ＯＡＭモード間のチャネル情報を用いて、各ＵＣＡで受信する同一ＯＡＭモード間の信号分離を行うとともに、所定の閾値３より大きい干渉を及ぼすＯＡＭモード間を判定し、そのＯＡＭモード間の干渉除去処理を行う。 In the fourth invention, an M-UCA composed of a plurality of UCAs arranged concentrically is provided in a transmitting device and a receiving device, and each UCA of the transmitting device generates and transmits a plurality of OAM mode signals, and the receiving device. In the OAM multiplex communication method in which each UCA receives and separates a plurality of OAM mode signals and spatially multiplex-transmits a signal of the number of UCA × the number of OAM modes, the receiving device and the transmitting device are each OAM mode of each UCA. Using the channel information between them, the signals are separated between the same OAM modes received by each UCA, the OAM modes that cause interference larger than a predetermined threshold value 3 are determined, and the interference elimination processing between the OAM modes is performed. ..

本発明により、ＯＡＭ多重通信システムにおいて、軸ズレやＲＦ回路の不完全性が生じる場合、多重数が増加しても、干渉除去処理に要する演算量の軽減ができる。また、チャネル情報取得の負荷を軽減することができる。これらにより、低演算量で、多重数を増やすことができ、伝送容量を向上する効果が得られる。 According to the present invention, when the axis shift or the RF circuit is incomplete in the OAM multiplex communication system, the amount of calculation required for the interference elimination process can be reduced even if the number of multiplexes increases. In addition, the load of channel information acquisition can be reduced. As a result, the number of multiplex can be increased with a low amount of calculation, and the effect of improving the transmission capacity can be obtained.

本発明の第１の実施形態における送受信装置の概要を示す図である。It is a figure which shows the outline of the transmission / reception device in 1st Embodiment of this invention. 第１の実施形態における受信装置のデジタル信号処理部23の構成例を示す図である。It is a figure which shows the structural example of the digital signal processing unit 23 of the receiving apparatus in 1st Embodiment. 第１の実施形態における受信装置のデジタル信号処理部23の処理手順例を示すフローチャートである。It is a flowchart which shows the processing procedure example of the digital signal processing unit 23 of the receiving apparatus in 1st Embodiment. 本発明の第２の実施形態における送受信装置の概要を示す図である。It is a figure which shows the outline of the transmission / reception device in the 2nd Embodiment of this invention. ＯＡＭモードの信号を生成するためのＵＣＡの位相設定例を示す図である。It is a figure which shows the phase setting example of UCA for generating the signal of OAM mode. ＯＡＭ多重信号の位相分布と信号強度分布の例を示す図である。It is a figure which shows the example of the phase distribution and the signal intensity distribution of the OAM multiplex signal. ＯＡＭ多重信号を分離するためのＵＣＡの位相設定例を示す図である。It is a figure which shows the phase setting example of UCA for separating the OAM multiplex signal. ＯＡＭ多重通信システムのＭ−ＵＣＡの構成例を示す図である。It is a figure which shows the configuration example of M-UCA of the OAM multiplex communication system.

以下に示す実施形態では、単一のＵＣＡまたはＭ−ＵＣＡで構成される送信アンテナと受信アンテナの中心は、ＧＰＳ情報やその他計測手法を用いてそれぞれの伝搬方向が一致し、送信アンテナと受信アンテナは伝搬直交平面に配置されるものとする。しかしながら、ＧＰＳ情報の誤差やそのたアンテナ配置の誤差により、送信アンテナと受信アンテナの中心のズレ（軸ズレ）が起こり得る場合を想定する。 In the embodiment shown below, the center of the transmitting antenna and the receiving antenna composed of a single UCA or M-UCA have the same propagation direction using GPS information or other measurement methods, and the transmitting antenna and the receiving antenna have the same propagation direction. Is arranged in the propagation orthogonal plane. However, it is assumed that the center of the transmitting antenna and the receiving antenna may be displaced (axis deviation) due to an error of GPS information or an error of the antenna arrangement.

（第１の実施形態）
第１の実施形態は、ＯＡＭ通信における課題を解決する実施形態である。
図１は、本発明の第１の実施形態における送受信装置の概要を説明する。図１(1),(2) は、ＯＡＭモードｎ〜ＯＡＭモード−ｎを伝送する場合における送信装置と受信装置を示す。 (First Embodiment)
The first embodiment is an embodiment that solves a problem in OAM communication.
FIG. 1 describes an outline of a transmission / reception device according to the first embodiment of the present invention. FIGS. 1 (1) and 1 (2) show a transmitting device and a receiving device in the case of transmitting OAM mode n to OAM mode −n.

図１(1) において、送信装置は、デジタル信号処理部１１、ＲＦ処理部１２、送信アンテナ部１３を備える。デジタル信号処理部１１は、データの変調や複数のＯＡＭモードで送信するストリーム生成などの通信に必要なデジタル信号処理を行う。ＲＦ処理部１２は、周波数変換、ＲＦフィルタリングなどのアナログ処理を行う。送信アンテナ部１３は、ＵＣＡにより複数のストリームを送信する。 In FIG. 1 (1), the transmitting device includes a digital signal processing unit 11, an RF processing unit 12, and a transmitting antenna unit 13. The digital signal processing unit 11 performs digital signal processing necessary for communication such as data modulation and stream generation to be transmitted in a plurality of OAM modes. The RF processing unit 12 performs analog processing such as frequency conversion and RF filtering. The transmitting antenna unit 13 transmits a plurality of streams by UCA.

図１(2) において、受信装置は、受信アンテナ部２１、ＲＦ処理部２２、デジタル信号処理部２３を備える。受信アンテナ部２１は、ＵＣＡにより複数のＯＡＭモードの信号を受信する。ＲＦ処理部２２は、受信信号の周波数変換、ＲＦフィルタリングなどのアナログ処理を行う。 In FIG. 1 (2), the receiving device includes a receiving antenna unit 21, an RF processing unit 22, and a digital signal processing unit 23. The receiving antenna unit 21 receives a plurality of OAM mode signals by UCA. The RF processing unit 22 performs analog processing such as frequency conversion of the received signal and RF filtering.

ここで、送信アンテナ部１３および受信アンテナ部２１は、ＯＡＭ通信の場合は、単一のＵＣＡで構成される。デジタル信号処理部２３は、ＳＩＣ等によりＯＡＭモード間の干渉除去処理を行う。チャネル推定を行う際には、送信装置のデジタル信号処理部１１は、既知信号を生成し送信し、受信装置のデジタル信号処理部２３は、この既知信号の情報を用いて，チャネル推定を行う。 Here, the transmitting antenna unit 13 and the receiving antenna unit 21 are composed of a single UCA in the case of OAM communication. The digital signal processing unit 23 performs interference removal processing between OAM modes by SIC or the like. When performing channel estimation, the digital signal processing unit 11 of the transmitting device generates and transmits a known signal, and the digital signal processing unit 23 of the receiving device uses the information of the known signal to perform channel estimation.

図２は、第１の実施形態における受信装置のデジタル信号処理部２３の構成例を示す。 図２において、デジタル信号処理部２３は、既知信号・データ信号分離部２３１と、チャネル推定部２３２と、干渉除去処理判定部２３３と、復調処理部２３４と、干渉除去処理部２３５から構成かれる。既知信号・データ信号分離部２３１は、ＲＦ処理部２２から入力した信号を既知信号とデータ信号に分離し、データ信号を復調処理部２３４に出力し、既知信号をチャネル推定部２３２に出力する。チャネル推定部２３２は、既知信号を用いてＯＡＭモード間のチャネル推定を行い、その結果を干渉除去処理判定部２３３と復調処理部２３４と干渉除去処理部２３５に出力する。 FIG. 2 shows a configuration example of the digital signal processing unit 23 of the receiving device according to the first embodiment. In FIG. 2, the digital signal processing unit 23 is composed of a known signal / data signal separation unit 231, a channel estimation unit 232, an interference removal processing determination unit 233, a demodulation processing unit 234, and an interference removal processing unit 235. The known signal / data signal separation unit 231 separates the signal input from the RF processing unit 22 into a known signal and a data signal, outputs the data signal to the demodulation processing unit 234, and outputs the known signal to the channel estimation unit 232. The channel estimation unit 232 performs channel estimation between OAM modes using known signals, and outputs the result to the interference removal processing determination unit 233, the demodulation processing unit 234, and the interference removal processing unit 235.

干渉除去処理判定部２３３は、チャネル推定の結果と干渉除去処理部２３５の出力結果を参照し、干渉除去処理の有無を判定し、その結果をチャネル推定部２３２と、干渉除去処理部２３５と、復調処理部２３４に出力する。復調処理部２３４は、干渉除去処理判定部２３３の結果を参照し、チャネル推定結果を用いてデータ信号の復調処理を行い、その結果を外部に出力する。同時に、入力データと復調結果を干渉除去処理部２３５に出力する。干渉除去処理部２３５は、干渉除去処理判定部２３３の判定結果を参照し、チャネル推定の結果と復調処理部２３４の出力信号を用いて干渉除去処理を行う。 The interference removal processing determination unit 233 refers to the result of the channel estimation and the output result of the interference removal processing unit 235, determines the presence or absence of the interference removal processing, and determines the presence or absence of the interference removal processing. Output to the demodulation processing unit 234. The demodulation processing unit 234 refers to the result of the interference removal processing determination unit 233, performs demodulation processing of the data signal using the channel estimation result, and outputs the result to the outside. At the same time, the input data and the demodulation result are output to the interference removal processing unit 235. The interference removal processing unit 235 refers to the determination result of the interference removal processing determination unit 233, and performs the interference removal processing using the channel estimation result and the output signal of the demodulation processing unit 234.

図３は、第１の実施形態における受信装置のデジタル信号処理部２３の処理手順を示す。
図２および図３において、既知信号・データ信号分離部２３１は、受信装置のＲＦ処理部２２から出力されるＯＡＭモードごとの信号を入力する（Ｓ11）。ここで、既知信号は、チャネル推定用既知信号や同期検出用の信号等のデータ信号以外のすべてのコントロール信号を表す。本発明の範囲外である同期検出等の処理は、この既知信号・データ信号分離部２３１において、あらかじめ決められている通信規格に沿って行われるものにする。本発明では、チャネル推定用の既知信号を対象とする。すなわち、既知信号・データ信号分離部２３１は、コントロール信号の内、チャネル推定用の既知信号をチャネル推定部２３２に出力し、コントロール信号以外のデータ信号を復調処理部２３４に出力する（Ｓ12）。ＯＦＤＭのように、ＦＦＴ処理が必要な場合は、既知信号・データ信号分離部２３１は、ＦＦＴ処理を行ってから既知信号とデータ信号に分離する。 FIG. 3 shows a processing procedure of the digital signal processing unit 23 of the receiving device according to the first embodiment.
In FIGS. 2 and 3, the known signal / data signal separation unit 231 inputs a signal for each OAM mode output from the RF processing unit 22 of the receiving device (S11). Here, the known signal represents all control signals other than the data signal such as the known signal for channel estimation and the signal for synchronization detection. Processing such as synchronization detection, which is outside the scope of the present invention, is performed in the known signal / data signal separation unit 231 in accordance with a predetermined communication standard. In the present invention, a known signal for channel estimation is targeted. That is, the known signal / data signal separation unit 231 outputs a known signal for channel estimation among the control signals to the channel estimation unit 232, and outputs a data signal other than the control signal to the demodulation processing unit 234 (S12). When FFT processing is required as in OFDM, the known signal / data signal separation unit 231 performs FFT processing and then separates the known signal and the data signal.

次に、チャネル推定部２３２は、既知信号・データ信号分離部２３１が出力するチャネル推定用の既知信号を用いてチャネル推定を行う（Ｓ13）。チャネル推定処理は、既知信号を用いて、すべてのＯＡＭモードからすべてのＯＡＭモードに対するチャネルに関し、ＺＦやＭＭＳＥ等の手法で行えばよい。チャネル推定部２３２は、このチャネル推定処理結果を干渉除去処理判定部２３３と復調処理部２３４に出力する。 Next, the channel estimation unit 232 performs channel estimation using the known signal for channel estimation output by the known signal / data signal separation unit 231 (S13). The channel estimation process may be performed by a method such as ZF or MMSE for channels from all OAM modes to all OAM modes using known signals. The channel estimation unit 232 outputs the channel estimation processing result to the interference removal processing determination unit 233 and the demodulation processing unit 234.

干渉除去処理判定部２３３は、各ＯＡＭモード間のチャネル推定結果を用いて、各ＯＡＭモード間の干渉信号電力を計算する（Ｓ14）。この干渉信号電力は、チャネル推定の結果の値の絶対値の２乗等の尺度で計算すればよい。各ＯＡＭモード間の干渉信号電力の最大値である最大干渉信号電力が、所定の閾値１より大きいか否かを判定する（Ｓ15）。最大干渉信号電力≦閾値１の場合は、パターン１−１の復調処理を行う（Ｓ16）。最大干渉信号電力＞閾値１の場合は、各ＯＡＭモード間の干渉信号電力が閾値１より大きいＯＡＭモード組の数が、所定の閾値２より大きいか否かを判定する（Ｓ17, Ｓ18）。ＯＡＭモード組数≦閾値２の場合は、パターン１−２の復調処理を行う（Ｓ19）。ＯＡＭモード組数＞閾値２の場合は、パターン１−３の処理を行う（Ｓ23）。 The interference removal processing determination unit 233 calculates the interference signal power between the OAM modes using the channel estimation result between the OAM modes (S14). This interference signal power may be calculated on a scale such as the square of the absolute value of the value of the result of channel estimation. It is determined whether or not the maximum interference signal power, which is the maximum value of the interference signal power between the OAM modes, is larger than the predetermined threshold value 1 (S15). When the maximum interference signal power ≤ threshold value 1, the demodulation process of pattern 1-1 is performed (S16). When the maximum interference signal power> the threshold value 1, it is determined whether or not the number of OAM mode sets in which the interference signal power between the OAM modes is larger than the threshold value 1 is larger than the predetermined threshold value 2 (S17, S18). When the number of OAM mode sets ≤ threshold value 2, the demodulation process of pattern 1-2 is performed (S19). When the number of OAM mode sets> the threshold value 2, the processing of patterns 1-3 is performed (S23).

このパターン１−１，パターン１−２，パターン１−３の判定結果は、チャネル推定部２３２と復調処理部２３４と干渉除去処理部２３５に入力する。 The determination results of patterns 1-1, pattern 1-2, and pattern 1-3 are input to the channel estimation unit 232, the demodulation processing unit 234, and the interference removal processing unit 235.

すなわち、パターン１−１の復調処理（Ｓ16）では、受信側における各ＯＡＭモード間の最大干渉信号電力が所定の閾値１以下の場合に、ＯＡＭモード間の独立性が保たれていると判断し、ＯＡＭモード間の干渉除去処理を行わずに、各ＯＡＭモードの受信信号の復調処理を行う。 That is, in the demodulation process (S16) of the pattern 1-1, it is determined that the independence between the OAM modes is maintained when the maximum interference signal power between the OAM modes on the receiving side is equal to or less than a predetermined threshold value 1. , Demodulation processing of the received signal of each OAM mode is performed without performing interference removal processing between OAM modes.

パターン１−２の復調処理（Ｓ19）では、受信側における各ＯＡＭモード間の最大干渉信号電力が所定の閾値１より大きく、かつ干渉信号電力が閾値１より大きいＯＡＭモード組数が所定の閾値２以下の場合に、まずＯＡＭモード間の干渉除去処理を行わずに各ＯＡＭモードの受信信号の復調を行う。次に、復調した信号を用いて元の信号のレプリカを生成し（Ｓ20）、このレプリカとチャネル推定情報を用いて、各ＯＡＭモード間でＳＩＣ等の手法により干渉除去処理を行い（Ｓ21）、その後に各ＯＡＭモードの受信信号の復調処理を行う（Ｓ22）。このとき、演算量の削減のため、干渉信号電力が閾値１以下ＯＡＭモード間の干渉除去処理は行わない。これは、それらのＯＡＭモード間の干渉は小さいため、干渉除去処理をしなくても、性能劣化は許容範囲に収まるためである。 In the demodulation process (S19) of pattern 1-2, the number of OAM mode sets in which the maximum interference signal power between the OAM modes on the receiving side is larger than the predetermined threshold value 1 and the interference signal power is larger than the threshold value 1 is the predetermined threshold value 2. In the following cases, first, the received signal of each OAM mode is demodulated without performing the interference removal processing between the OAM modes. Next, a replica of the original signal is generated using the demodulated signal (S20), and interference elimination processing is performed between each OAM mode by a method such as SIC using this replica and the channel estimation information (S21). After that, the demodulation process of the received signal of each OAM mode is performed (S22). At this time, in order to reduce the amount of calculation, the interference removal processing between the OAM modes in which the interference signal power is equal to or less than the threshold value 1 is not performed. This is because the interference between these OAM modes is small, and the performance deterioration is within the permissible range even if the interference removal processing is not performed.

パターン１−３の処理では、受信側における各ＯＡＭモード間の最大干渉信号電力が所定の閾値１より大きく、かつ干渉信号電力が閾値１より大きいＯＡＭモード組数が所定の閾値２より大きい場合に、各ＯＡＭモードのすべての受信信号とすべてのＯＡＭモード間のチャネル情報を用いて、ＺＦ等の等化手法により干渉除去処理を行い（Ｓ23）、その後に各ＯＡＭモードの受信信号の復調処理を行う（Ｓ24）。 In the processing of pattern 1-3, when the maximum interference signal power between each OAM mode on the receiving side is larger than the predetermined threshold value 1 and the number of OAM mode sets whose interference signal power is larger than the threshold value 1 is larger than the predetermined threshold value 2. , Interference removal processing is performed by an equalization method such as ZF using all the received signals of each OAM mode and the channel information between all OAM modes (S23), and then the demodulation processing of the received signals of each OAM mode is performed. Do (S24).

ここで、チャネル推定部２３２は、パターン１−１とパターン１−２の場合、復調処理と干渉除去処理に必要なチャネルのみのチャネル推定処理を行うことで、演算量を削減する。すなわち、あらかじめ決められた周期ごとには、すべてのＯＡＭモードのすべてのＯＡＭモードに対するチャネル推定処理を行うが、その周期内では、復調処理と干渉除去処理に必要なチャネルのみのチャネル推定処理を行う。例えば、パターン１−１の場合、チャネル情報取得の負荷を削減するため、異なるＯＡＭモード間のチャネル推定処理を省略してもよい。また、パターン１−２の場合も、ＳＩＣ処理を行わないＯＡＭモード間のチャネル推定処理を省略してもよい。このようにチャネル推定部２３２が必要なチャネルの推定処理のみを行う場合、干渉除去処理判定部２３３は、チャネル推定部２３２が行ったチャネル推定計算結果のみを用いて、パターン１−１〜１−３の判定を行う。 Here, in the case of the pattern 1-1 and the pattern 1-2, the channel estimation unit 232 reduces the amount of calculation by performing the channel estimation process of only the channels necessary for the demodulation process and the interference removal process. That is, the channel estimation processing for all OAM modes of all OAM modes is performed for each predetermined cycle, but within that cycle, the channel estimation processing for only the channels required for the demodulation processing and the interference removal processing is performed. .. For example, in the case of pattern 1-1, the channel estimation process between different OAM modes may be omitted in order to reduce the load of channel information acquisition. Further, also in the case of pattern 1-2, the channel estimation process between the OAM modes in which the SIC process is not performed may be omitted. When the channel estimation unit 232 only performs the necessary channel estimation processing in this way, the interference elimination processing determination unit 233 uses only the channel estimation calculation results performed by the channel estimation unit 232 to perform patterns 1-1 to 1-. Judgment of 3 is made.

（復調処理部２３４の動作）
次に、復調処理部２３４の動作について詳しく説明する。復調処理部２３４は、既知信号・データ信号分離部２３１が出力するデータ信号と、チャネル推定部２３２が出力するチャネル情報を用いて復調処理を行う。ここで、干渉除去処理判定部２３３から復調処理部２３４にパターン１−１の結果が入力すると、他のＯＡＭモードからの干渉除去処理を行わずに、各ＯＡＭモードの受信信号の復調処理を行う。 (Operation of demodulation processing unit 234)
Next, the operation of the demodulation processing unit 234 will be described in detail. The demodulation processing unit 234 performs demodulation processing using the data signal output by the known signal / data signal separation unit 231 and the channel information output by the channel estimation unit 232. Here, when the result of the pattern 1-1 is input from the interference removal processing determination unit 233 to the demodulation processing unit 234, the reception signal of each OAM mode is demodulated without performing the interference removal processing from the other OAM modes. ..

また、干渉除去処理判定部２３３にパターン１−２の結果が入力すると、まず各ＯＡＭモードの受信信号の復調処理を行い、その結果を干渉除去処理部２３５に出力する。また、パターン１−２の場合は、既知信号・データ信号分離部２３１が復調処理部２３４に出力したデータ信号も合わせて干渉除去処理部２３５に出力する。ここで、干渉除去処理部２３５は、各ＯＡＭモード間でＳＩＣ等の手法により干渉除去処理を行い、その結果を再び復調処理部２３４に入力する。復調処理部２３４は、干渉除去処理部２３５から入力する信号を用いて、再び各ＯＡＭモードの復調処理を行う。この過程を繰り返すことで、干渉除去処理の性能を向上することができる。この繰り返し処理において、繰り返しの数は、あらかじめ決められた数分だけ行うこともできるし、干渉除去処理部２３５が繰り返し処理をする中で、ｎ回目のレプリカとｎ＋１回目のレプリカの差があらかじめ決められた閾値より小さくなると繰り返し処理を終了することもできる。 When the result of the pattern 1-2 is input to the interference removal processing determination unit 233, the reception signal of each OAM mode is demodulated first, and the result is output to the interference removal processing unit 235. Further, in the case of the pattern 1-2, the data signal output by the known signal / data signal separation unit 231 to the demodulation processing unit 234 is also output to the interference removal processing unit 235. Here, the interference removal processing unit 235 performs interference removal processing between each OAM mode by a method such as SIC, and inputs the result to the demodulation processing unit 234 again. The demodulation processing unit 234 performs demodulation processing of each OAM mode again using the signal input from the interference removal processing unit 235. By repeating this process, the performance of the interference removal process can be improved. In this iterative process, the number of iterations can be determined by a predetermined number, or the difference between the nth replica and the n + 1th replica is predetermined while the interference removal processing unit 235 performs the iterative process. The iterative process can be terminated when the value becomes smaller than the threshold value.

また、干渉除去処理判定部２３３にパターン１−３の結果が入力すると、各ＯＡＭモード間のチャネル情報を用いて、ＺＦやＭＭＳＥ法により等化処理を行い、干渉除去処理を行ってから、各ＯＡＭモードの受信信号の復調処理を行う。 Further, when the result of the pattern 1-3 is input to the interference elimination processing determination unit 233, the channel information between each OAM mode is used to perform equalization processing by the ZF or MMSE method, and after performing the interference elimination processing, each Demodulates the received signal in OAM mode.

（干渉除去処理部２３５の動作）
次に、干渉除去処理部２３５の動作について詳しく説明する。干渉除去処理部２３５は、干渉除去処理判定部２３３からパターン１−２の結果が入力すると、復調処理部２３４からの入力信号と、チャネル推定部２３２からのチャネル推定結果を用いて、干渉除去処理を行う。ここで、干渉除去処理判定部２３３の判定結果がパターン１−２の場合、干渉除去処理を要するＯＡＭモード組に関する情報を干渉除去処理部２３５に入力する。また、チャネル推定部２３２は、このパターン１−２の場合、干渉除去処理を要するＯＡＭモード組のみのチャネル推定結果を干渉除去処理部２３５に入力してもよい。干渉除去処理部２３５は、まず復調処理部２３４が出力する復調後の信号とチャネル推定結果を用いて、元の信号のレプリカを生成する。ここで生成するレプリカは、干渉を及ぼすと判断されるＯＡＭモード組のみを生成すればよい。例えば、ＯＡＭモード１からＯＡＭモード２への干渉量が閾値１より高い場合、ＯＡＭモード１の復調信号と、ＯＡＭモード１からＯＡＭモード２へのチャネル情報を用いて、ＯＡＭモード１からＯＡＭモード２への干渉に相当するレプリカを生成する。 (Operation of interference removal processing unit 235)
Next, the operation of the interference removing processing unit 235 will be described in detail. When the result of pattern 1-2 is input from the interference removal processing determination unit 233, the interference removal processing unit 235 uses the input signal from the demodulation processing unit 234 and the channel estimation result from the channel estimation unit 232 to perform interference removal processing. I do. Here, when the determination result of the interference removal processing determination unit 233 is pattern 1-2, the information regarding the OAM mode set that requires the interference removal processing is input to the interference removal processing unit 235. Further, in the case of this pattern 1-2, the channel estimation unit 232 may input the channel estimation result of only the OAM mode set that requires the interference removal processing to the interference removal processing unit 235. The interference removal processing unit 235 first generates a replica of the original signal by using the demodulated signal output by the demodulation processing unit 234 and the channel estimation result. The replica generated here need only generate the OAM mode set that is determined to cause interference. For example, when the amount of interference from OAM mode 1 to OAM mode 2 is higher than the threshold value 1, OAM mode 1 to OAM mode 2 is used by using the demodulated signal of OAM mode 1 and the channel information from OAM mode 1 to OAM mode 2. Create a replica that corresponds to the interference with.

次に、データ信号のＯＡＭモード２の信号からこのレプリカを引き算する。このように、干渉除去処理の対象となるＯＡＭモードのレプリカを生成し、データ信号から引き算した結果を再び復調処理部２３４に出力する。復調処理部２３４は、干渉除去処理部２３５から入力する信号を用いて改めて復調処理を行い、その復調結果を再び干渉除去処理部２３５に入力する。このような過程を繰り返すことにより、干渉除去性能を改善する。この繰り返し処理は、前述のようにあらかじめ決めた数の繰り返し後に終了してもよいし、元のデータ信号からレプリカ信号の引き算後の信号の、各繰り返し過程の差を計算し、その差があらかじめ決めた閾値より小さくなると、繰り返し処理を終了してもよい。また、繰り返しＳＩＣ処理に一般的に使われる終了法により終了してもよい。 Next, this replica is subtracted from the OAM mode 2 signal of the data signal. In this way, the replica of the OAM mode to be the target of the interference removal processing is generated, and the result of subtraction from the data signal is output to the demodulation processing unit 234 again. The demodulation processing unit 234 performs demodulation processing again using the signal input from the interference removal processing unit 235, and inputs the demodulation result to the interference removal processing unit 235 again. By repeating such a process, the interference removal performance is improved. This iterative process may be terminated after a predetermined number of iterations as described above, or the difference in each iteration process of the signal after subtraction of the replica signal from the original data signal is calculated, and the difference is obtained in advance. When it becomes smaller than the determined threshold value, the iterative process may be terminated. Further, it may be terminated by a termination method generally used for repetitive SIC processing.

以下、第１の実施形態の処理について数式を用いて説明する。以下の例では、５個のＯＡＭモード−２，−１，０，１，２を用いてＯＡＭ通信を行う場合を想定する。なお、送信信号をＸi とし、受信信号をＹj とする。ここで、ｉとｊは、ＯＡＭモードの次数を表す。また、送信ＯＡＭモードｉと受信ＯＡＭモードｊ間のチャネルをＨj,i と表す。なお、送受信信号は、ＯＦＤＭ方式等のように周波数領域にてデータ変復調を行う通信方式を想定するが、ＳＣ（single carrier）方式等のように時間領域にてデータを変復調する通信方式への適用も同様に可能である。 Hereinafter, the processing of the first embodiment will be described using mathematical formulas. In the following example, it is assumed that OAM communication is performed using five OAM modes -2, -1, 0, 1, and 2. Let Xi be the transmission signal and Yj be the reception signal. Here, i and j represent the order of the OAM mode. Further, the channels between the transmission OAM mode i and the reception OAM mode j are represented by Hj and i. The transmitted / received signal is assumed to be a communication method that changes and demolishes data in the frequency domain, such as the OFDM method, but is applied to a communication method that changes and demolishes data in the time domain, such as the SC (single carrier) method. Is possible as well.

受信装置のＲＦ処理部２２の出力信号は、以下の式(1) のようになる。ここでは、ＯＦＤＭの複数のキャリアの内、１個のサブキャリアについて記述するが、他のサブキャリアの同様の手法を適用すればよい。なお、送信側がチャネル推定用の信号とデータ信号を時系列に交互に分けて送信する場合は、チャネル推定用の信号間では、チャネルの変動はないと想定する。すなわち、チャネル推定用の信号を用いてチャネル推定を行ってからそのチャネル推定結果を用いて、データ信号の干渉分離・等化・復調処理を行う際には、チャネル情報は変わらないと想定する。また、チャネル推定用の信号とデータ信号の周波数領域に分けて伝送する場合、すなわち、複数のサブキャリアの内、一部のサブキャリアで既知信号を送信し、残りのサブキャリアでデータ信号を送信する場合は、既知信号を用いてチャネル推定を行い、その結果から内挿（interpolation ）等の手法によりデータ信号のサブキャリアのチャネル推定を行うものとする。なお、時間領域と周波数領域を合わせて既知信号を挿入する方式も同様に既知信号を用いてチャネル推定を行い、周波数領域では、内挿等によりデータ信号のサブキャリアのチャネル推定を行い、時間領域では、次回の既知信号と間ではチャネルは変わらないと想定してもよい。 The output signal of the RF processing unit 22 of the receiving device is as shown in the following equation (1). Here, one subcarrier is described among the plurality of OFDM carriers, but the same method for other subcarriers may be applied. When the transmitting side alternately transmits the channel estimation signal and the data signal in chronological order, it is assumed that there is no channel variation between the channel estimation signals. That is, it is assumed that the channel information does not change when the channel estimation is performed using the channel estimation signal and then the interference separation / equalization / demodulation processing of the data signal is performed using the channel estimation result. Further, when the signal for channel estimation and the data signal are transmitted separately in the frequency region, that is, a known signal is transmitted by some subcarriers among a plurality of subcarriers, and a data signal is transmitted by the remaining subcarriers. In this case, the channel is estimated using the known signal, and the channel of the subcarrier of the data signal is estimated from the result by a method such as interpolation. Similarly, in the method of inserting a known signal by combining the time domain and the frequency domain, channel estimation is performed using the known signal, and in the frequency domain, the channel estimation of the subcarrier of the data signal is performed by interposition or the like, and the time domain. Then, it may be assumed that the channel does not change from the next known signal.

なお、既知信号とデータ信号の挿入の方法は、本発明の範囲外の各種類の無線通信方式を採用すると想定する。一般的に使われるの無線通信方式は、既知信号でチャネル推定を行い、内挿やチャネルが変動しない前提で、その推定したチャネル情報を用いてデータ信号の等化処理を行っても問題が生じないように設計されているため、前述のように想定してもよい。 It is assumed that the method of inserting the known signal and the data signal adopts each type of wireless communication method outside the scope of the present invention. In a commonly used wireless communication method, a problem arises even if channel estimation is performed using a known signal and data signal equalization processing is performed using the estimated channel information on the premise that interpolation and channels do not fluctuate. Since it is designed so that it does not exist, it may be assumed as described above.

Figure 0006962135
Figure 0006962135

ここで、Ｎk は、受信側のＯＡＭモードｋでの雑音を表す。既知信号・データ信号分離部２３１は、式(1) が表す受信信号の内、チャネル推定用の既知信号とデータ信号を分離し、チャネル推定部２３２に入力する。チャネル推定用の送信信号、すなわち、式(1) のＸi が既知であるため、チャネル推定部２３２は受信信号と既知信号を用いて、ＺＦ方法等にチャネル推定を行うことができる。この動作によりすべてのＨj,i の推定ができる。このチャネル推定処理の結果は、干渉除去処理判定部２３３に入力される。 Here, Nk represents the noise in the OAM mode k on the receiving side. The known signal / data signal separation unit 231 separates the known signal for channel estimation and the data signal from the received signals represented by the equation (1), and inputs them to the channel estimation unit 232. Since the transmission signal for channel estimation, that is, Xi of the equation (1) is known, the channel estimation unit 232 can perform channel estimation by the ZF method or the like using the received signal and the known signal. By this operation, all Hj and i can be estimated. The result of this channel estimation process is input to the interference elimination process determination unit 233.

干渉除去処理判定部２３３は、すべてのＨj,i の絶対値（もしくは絶対値の２乗）と、あらかじめ決められた閾値１との比較を行い、パターン１−１、パターン１−２、パターン１−３の判定を行う。 The interference removal processing determination unit 233 compares the absolute values (or the squares of the absolute values) of all Hj and i with the predetermined threshold value 1, and performs pattern 1-1, pattern 1-2, and pattern 1. Make a judgment of -3.

パターン１−１の場合は、他のＯＡＭモードからの干渉を無視してもよいため、復調処理部２３４は、同一ＯＡＭモード間のチャネル情報のみを用いて、チャネル等化処理を行ってから、既知信号・データ信号分離部２３１から入力するデータ信号に対して復調処理を行う。例えば、ＺＦによる等化処理の場合、式(2) の復調処理を行う。次に、その結果であるを用いて復調処理を行う。式(2) のＸi は、ＯＡＭモードｉの送信信号の等化処理後の値を表し、式(3) のＸi は、式(2) のＸi の復調後の信号を表す。なお、Ｘの上につく「＾」や「・」は文中では省略している（以下同様）。また、demod( )は、チャネル符号の復号処理等を含む復調処理を表す。 In the case of pattern 1-1, interference from other OAM modes may be ignored. Therefore, the demodulation processing unit 234 performs channel equalization processing using only the channel information between the same OAM modes, and then performs channel equalization processing. Demodulation processing is performed on the data signal input from the known signal / data signal separation unit 231. For example, in the case of equalization processing by ZF, the demodulation processing of Eq. (2) is performed. Next, the demodulation process is performed using the result. Xi in Eq. (2) represents the value after equalization processing of the transmission signal in OAM mode i, and Xi in Eq. (3) represents the signal after demodulation of Xi in Eq. (2). The "^" and "・" above X are omitted in the text (the same applies hereinafter). Further, demod () represents a demodulation process including a channel code decoding process and the like.

Figure 0006962135
Figure 0006962135

Figure 0006962135
Figure 0006962135

パターン１−２の場合は、まず式(2) のように他の干渉を無視してから各ＯＡＭモードの等化処理と復調処理を行い、それらの結果を用いて、レプリカを生成し、干渉除去処理の対象となるＯＡＭモード組の干渉除去処理を行う。ここで、干渉除去処理の対象でないＯＡＭモード間の干渉は雑音とみなす。 In the case of pattern 1-2, first, as shown in Eq. (2), other interference is ignored, then equalization processing and demodulation processing are performed for each OAM mode, and the results are used to generate a replica and interfere. The interference removal process of the OAM mode set that is the target of the removal process is performed. Here, interference between OAM modes that are not subject to interference removal processing is regarded as noise.

例えば、干渉除去処理の対象となるＯＡＭモード組が、(-2,0)、(-2,2)、(-1,1)、(0,-2)、(0,2) 、(1,-1)、(2,-2)の場合を示す。ここで、(i,j) は、送信ＯＡＭモードｉから受信ＯＡＭモードｊへの干渉を表す。この場合、ＳＩＣ処理の対象となる式を式(4) に示す。 For example, the OAM mode sets targeted for interference removal processing are (-2,0), (-2,2), (-1,1), (0, -2), (0,2), (1). The cases of, -1) and (2, -2) are shown. Here, (i, j) represents interference from the transmission OAM mode i to the reception OAM mode j. In this case, the equation to be subjected to the SIC processing is shown in Equation (4).

Figure 0006962135
Figure 0006962135

ここで、干渉除去処理の対象でないＯＡＭモード間の干渉は雑音とみなしたため、式(1) の中の干渉除去処理の対象でないＯＡＭモード間の干渉を表す項は、式(4）では雑音と
して表現されている。すなわち、（Ｎj)’は、雑音とみなされた干渉を含む受信ＯＡＭモ
ードｊの雑音を表す。ＳＩＣ処理後の信号は式(5) のように計算する。 Here, since the interference between the OAM modes that are not the target of the interference removal processing is regarded as noise, the term representing the interference between the OAM modes that are not the target of the interference removal processing in the equation (1) is regarded as noise in the equation (4). It is expressed. That is, (Nj)'represents the noise of the received OAM mode j including the interference regarded as noise. The signal after SIC processing is calculated as shown in Eq. (5).

Figure 0006962135
Figure 0006962135

ここで、mod(Ｘi ）は、送信側のＯＡＭモードｉの信号のレプリカである。なお、mod(Ｘi ）は、送信装置が行ったチャネル符号化処理を含む変調処理を表す。次に、干渉除去処理は、式(5) の計算結果（Ｙ-2，Ｙ-1，Ｙ0 ，Ｙ1 ，Ｙ2 ）を復調処理部２３４に入力する。信号復調部２３４は、式(6) のように等化処理を行う。次に、式(6) の結果を用いて、式(3) で表す復調処理を改めて行う。 Here, mod (Xi) is a replica of the signal of OAM mode i on the transmitting side. Note that mod (Xi) represents a modulation process including a channel coding process performed by the transmitting device. Next, in the interference removal processing, the calculation results (Y-2, Y-1, Y0, Y1, Y2) of the equation (5) are input to the demodulation processing unit 234. The signal demodulation unit 234 performs equalization processing as shown in Eq. (6). Next, using the result of Eq. (6), the demodulation process represented by Eq. (3) is performed again.

Figure 0006962135
Figure 0006962135

このパターン１−２では、このような復調処理とレプリカ生成による干渉処理を繰り返して行う。繰り返しの終了は、前記のように所定回数だけ行ってもよいし、前回の繰り返し処理から、次の繰り返し処理の結果の差分が一定値以内になるまで続けてもよい。たとえば、式(5) のＹj 、もしくは式(2) のＸi または式(3) のＸi の差分から、繰り返し処理の終了を判断してもよい。また、このＳＩＣ処理に必要なチャネルのみの推定処理を行うことで、チャネル推定の演算量を軽減することができる。 In this pattern 1-2, such demodulation processing and interference processing by replica generation are repeated. The repetition may be completed a predetermined number of times as described above, or may be continued until the difference between the results of the next repetition processing and the result of the next repetition processing is within a certain value. For example, the end of the iterative process may be determined from the difference between Yj in Eq. (5), Xi in Eq. (2), or Xi in Eq. (3). Further, by performing the estimation processing of only the channels required for this SIC processing, the calculation amount of the channel estimation can be reduced.

パターン１−３の場合は、式(1) のすべての項を用いて、ＺＦやＭＭＳＥ等によりすべてのＯＡＭモードの信号に対し、同時に等化処理を行ってから、各ＯＡＭモードの復調処理を行う。 In the case of pattern 1-3, all the terms of the equation (1) are used to simultaneously perform equalization processing on all OAM mode signals by ZF, MMSE, etc., and then demodulation processing of each OAM mode is performed. conduct.

このように、軸ズレやＲＦの不完全性によりＯＡＭモード間の干渉が生じた場合、本発明により各ＯＡＭモード間の干渉量を考慮して、その処理を要するＯＡＭモード間のみで行うことにより、干渉除去に必要な演算量を削減することができる。また、チャネル推定の演算量の削減も可能となる。特に、ＧＰＳや工学位置調整器なのにより、荒い軸ズレはできたが、精密な軸合わせができなかった場合等、パターン１−２が主となる無線通信環境では、特に演算量の削減効果が大きくなる。また、チャネルの時変動により。パターン１−１，１−２，１−３が時変動する場合、本発明によりチャネル状況に合わせて、適切にＯＡＭモード間干渉除去処理を行うことができるため、常に干渉除去処理をしない手法に比べて性能改善効果が得られ、また、常にすべてのＯＡＭモードに対する干渉除去処理を行う手法に比べて、演算量削減ができる。 In this way, when interference between OAM modes occurs due to axis misalignment or RF imperfections, the amount of interference between each OAM mode is taken into consideration according to the present invention, and the processing is performed only between the OAM modes that require the processing. , The amount of calculation required for interference removal can be reduced. In addition, the amount of calculation for channel estimation can be reduced. In particular, in a wireless communication environment where pattern 1-2 is the main, such as when rough axis misalignment is possible due to GPS or engineering position adjuster, but precise axis alignment is not possible, the effect of reducing the amount of calculation is particularly effective. growing. Also, due to channel time fluctuations. When the patterns 1-1, 1-2, and 1-3 fluctuate with time, the interference removal processing between OAM modes can be appropriately performed according to the channel condition according to the present invention. Compared with this, the performance improvement effect can be obtained, and the amount of calculation can be reduced as compared with the method of always performing the interference removal processing for all OAM modes.

（閾値１と閾値２の設定例）
閾値１と閾値２は、ＯＡＭ通信の要求性能、チャネルの特性等を考慮し、本発明と別途の手法で決めればよい。 (Example of setting threshold 1 and threshold 2)
The threshold value 1 and the threshold value 2 may be determined by a method different from that of the present invention in consideration of the required performance of OAM communication, the characteristics of the channel, and the like.

例えば、閾値１は、あらかじめ決められているＳＩＲ（signal to interference ratio; 干渉と信号の電力比率）から決めることができる。例えば、ＳＩＮＲが10dB以上必要となる設計されたシステムの場合は、閾値１は、信号電力より10dB低くなるように設定される。 For example, the threshold value 1 can be determined from a predetermined SIR (signal to interference ratio). For example, in the case of a designed system that requires SINR of 10 dB or more, the threshold value 1 is set to be 10 dB lower than the signal power.

閾値２は、すべてのＯＡＭモードの等化処理を行う場合と、ＳＩＣ処理を行う場合の演算量を比較し、ＳＩＣ処理をする場合の演算量が大きくならないように設定することができる。例えば、５個のＯＡＭモードを用いて通信をする場合、すべてのＯＡＭモードを用いる等化処理の演算量は、ＯＡＭモード数５の３乗で 125となる。ＳＩＣ処理の演算量はＳＩＣ処理の手法により異なるが、例えばＳＩＣ処理の対象のＯＡＭモード数の 3.5乗の手法を使う場合の等化処理の演算量は、ＳＩＣ処理の対象のＯＡＭモード数４の 3.5乗で 128となり、５個すべてのＯＡＭモードを用いる等化処理の演算量 125より大きくなるため、閾値２は「３」と設定される。 The threshold value 2 can be set so that the calculation amount in the case of performing the equalization processing of all OAM modes and the calculation amount in the case of performing the SIC processing are compared and the calculation amount in the case of performing the SIC processing does not become large. For example, when communicating using five OAM modes, the amount of calculation for the equalization process using all OAM modes is 125, which is the cube of the number of OAM modes 5. The amount of calculation for SIC processing differs depending on the method of SIC processing. For example, when the method of the 3.5th power of the number of OAM modes to be processed by SIC is used, the amount of calculation for equalization processing is the number of OAM modes 4 to be processed by SIC. The threshold value 2 is set to "3" because it becomes 128 when it is raised to the 3.5th power, which is larger than the calculation amount 125 of the equalization processing using all five OAM modes.

（第２の実施形態）
第２の実施形態は、ＯＡＭ−ＭＩＭＯ通信における課題を解決する実施形態である。
図４は、本発明の第２の実施形態における送受信装置の概要を説明する。図４(1),(2) は、複数のＵＣＡを用いて、かつ各ＵＣＡがＯＡＭモードｎからＯＡＭモード−ｎを伝送する場合における送信装置と受信装置を示す。 (Second Embodiment)
The second embodiment is an embodiment that solves a problem in OAM-MIMO communication.
FIG. 4 describes an outline of the transmission / reception device according to the second embodiment of the present invention. 4 (1) and 4 (2) show a transmitting device and a receiving device when a plurality of UCAs are used and each UCA transmits the OAM mode-n from the OAM mode n.

図４(1) において、送信装置は、デジタル信号処理部３１、ＲＦ処理部３２、送信アンテナ部３３を備える。デジタル信号処理部３１は、データの変調や複数のＵＣＡ＃１〜＃ｍから送信する各ＯＡＭモードの信号生成などの通信に必要なデジタル信号処理を行う。ＲＦ処理部３２は、周波数変換、ＲＦフィルタリングなどのアナログ処理を行う。送信アンテナ部３３は、複数のＵＣＡ＃１〜＃ｍから各ＯＡＭモードの信号を送信する。 In FIG. 4 (1), the transmitting device includes a digital signal processing unit 31, an RF processing unit 32, and a transmitting antenna unit 33. The digital signal processing unit 31 performs digital signal processing necessary for communication such as data modulation and signal generation in each OAM mode transmitted from a plurality of UCA # 1 to # m. The RF processing unit 32 performs analog processing such as frequency conversion and RF filtering. The transmitting antenna unit 33 transmits signals of each OAM mode from a plurality of UCA # 1 to # m.

図４(2) において、受信装置は、受信アンテナ部４１、ＲＦ処理部４２、デジタル信号処理部４３を備える。受信アンテナ部４１は、複数のＵＣＡ＃１〜＃ｍで各ＯＡＭモードの信号を受信する。ＲＦ処理部３２は、周波数変換、ＲＦフィルタリングなどのアナログ処理を行う。 In FIG. 4 (2), the receiving device includes a receiving antenna unit 41, an RF processing unit 42, and a digital signal processing unit 43. The receiving antenna unit 41 receives the signals of each OAM mode by a plurality of UCA # 1 to # m. The RF processing unit 32 performs analog processing such as frequency conversion and RF filtering.

第２の実施形態では、Ｍ−ＵＣＡを構成するＵＣＡごとに、第１の実施形態と同様のＲＦ処理部３２，４２、送信アンテナ部３３および受信アンテナ部４１を備え、デジタル信号処理部４３にて本実施形態に必要な信号分離・等化・干渉除去・復調処理を行う構成でもよい。 In the second embodiment, each UCA constituting the M-UCA is provided with the same RF processing units 32 and 42, the transmitting antenna unit 33 and the receiving antenna unit 41 as in the first embodiment, and the digital signal processing unit 43 is provided with the digital signal processing unit 43. The signal separation, equalization, interference removal, and demodulation processing required for the present embodiment may be performed.

ここで、送信アンテナ部３３および受信アンテナ部４１は、ＯＡＭ−ＭＩＭＯ通信の場合は、Ｍ−ＵＣＡで構成される。複数のＵＣＡ＃１〜＃ｍが送信する同一ＯＡＭモードの複数の信号を、デジタル信号処理部４３がＯＡＭモードごとにＺＦやＭＭＳＥ手法などによる等化処理により分離する。また、第１の実施形態のパターン１−２と同様のパターン２−２の場合は、ＳＩＣ等による干渉除去処理を行う。チャネル推定を行う際には、送信装置のデジタル信号処理部３１が既知信号を生成し送信し、受信装置のデジタル信号処理部４３がこの既知信号の情報を用いて，チャネル推定を行う。また、第１の実施形態のパターン１−３と同様のパターン２−３の場合は、すべてのＵＣＡのすべてのＯＡＭモードを用いて干渉除去処理を行う。 Here, the transmitting antenna unit 33 and the receiving antenna unit 41 are composed of M-UCA in the case of OAM-MIMO communication. The digital signal processing unit 43 separates a plurality of signals in the same OAM mode transmitted by the plurality of UCA # 1 to # m by equalization processing by a ZF or MMSE method for each OAM mode. Further, in the case of pattern 2-2 similar to pattern 1-2 of the first embodiment, interference removal processing by SIC or the like is performed. When performing channel estimation, the digital signal processing unit 31 of the transmitting device generates and transmits a known signal, and the digital signal processing unit 43 of the receiving device uses the information of the known signal to perform channel estimation. Further, in the case of the pattern 2-3 similar to the pattern 1-3 of the first embodiment, the interference removal process is performed using all the OAM modes of all the UCAs.

受信装置のデジタル信号処理部４３の構成は、図２に示す第１の実施形態のデジタル信号処理部２３と同様である。受信装置のデジタル信号処理部４３の処理手順は、図３に示す第１の実施形態の処理手順と同様である。ただし、閾値１を閾値３、閾値２を閾値４と読み替える。 The configuration of the digital signal processing unit 43 of the receiving device is the same as that of the digital signal processing unit 23 of the first embodiment shown in FIG. The processing procedure of the digital signal processing unit 43 of the receiving device is the same as the processing procedure of the first embodiment shown in FIG. However, the threshold value 1 is read as the threshold value 3, and the threshold value 2 is read as the threshold value 4.

以下、図２および図３を参照して、第２の実施形態の動作例について説明する。受信装置のＲＦ処理部４２の出力信号は、デジタル信号処理部４３の既知信号・データ信号分離部２３１に入力する。ここで、すべてのＵＣＡのすべてのＯＡＭモードの信号は、既知信号・データ信号分離部２３１に入力し、既知信号はすべてのＵＣＡのすべてのＯＡＭモード毎に、異なるチャネル推定用既知信号や同期検出用のコントロール信号等で構成される。 Hereinafter, an operation example of the second embodiment will be described with reference to FIGS. 2 and 3. The output signal of the RF processing unit 42 of the receiving device is input to the known signal / data signal separation unit 231 of the digital signal processing unit 43. Here, the signals of all OAM modes of all UCAs are input to the known signal / data signal separation unit 231, and the known signals are different known signals for channel estimation and synchronous detection for all OAM modes of all UCAs. It is composed of control signals for.

次に、チャネル推定部２３２は、既知信号・データ信号分離部２３１が出力するチャネル推定用既知信号を用いてチャネル推定を行う。チャネル推定処理は、既知信号を用いて、各ＵＣＡの各ＯＡＭモードに対するチャネルに関し、ＺＦやＭＭＳＥ等の手法で行えばよい。チャネル推定部２３２は、このチャネル推定処理結果を干渉除去処理判定部２３３と復調処理部２３４と干渉除去処理部２３５に出力する。 Next, the channel estimation unit 232 performs channel estimation using the known signal for channel estimation output by the known signal / data signal separation unit 231. The channel estimation process may be performed by a method such as ZF or MMSE with respect to the channel for each OAM mode of each UCA using a known signal. The channel estimation unit 232 outputs the channel estimation processing result to the interference removal processing determination unit 233, the demodulation processing unit 234, and the interference removal processing unit 235.

干渉除去処理判定部２３３は、各ＵＣＡの各ＯＡＭモード間のチャネル推定結果を用いて、各ＵＣＡと各ＯＡＭモード間の干渉量を計算する。この干渉量は、第１の実施形態のようにチャネル推定計算後の値の絶対値、もしくはその２乗等で計算すればよい。 The interference removal processing determination unit 233 calculates the amount of interference between each UCA and each OAM mode by using the channel estimation result between each OAM mode of each UCA. This interference amount may be calculated by the absolute value of the value after the channel estimation calculation as in the first embodiment, or the square of the absolute value.

各ＵＣＡの各ＯＡＭモード間の最大干渉信号電力が所定の閾値３より大きいか否かを判定する。また、各ＯＡＭモード間の干渉信号電力が閾値３より大きいＯＡＭモード組の数が所定の閾値４より大きいか否かを判定する。この結果により、第１の実施形態のパターン１−１，１−２，１−３と同様のパターン２−１，２−２，２−３を判定し、判定結果をチャネル推定部２３２と復調処理部２３４と干渉除去処理部２３５に出力する。 It is determined whether or not the maximum interference signal power between each OAM mode of each UCA is larger than a predetermined threshold value 3. Further, it is determined whether or not the number of OAM mode sets in which the interference signal power between the OAM modes is larger than the threshold value 3 is larger than the predetermined threshold value 4. Based on this result, patterns 2-1, 1-2, 2-3 similar to patterns 1-1, 1-2, 1-3 of the first embodiment are determined, and the determination result is demodulated with the channel estimation unit 232. Output to the processing unit 234 and the interference removal processing unit 235.

ここで、チャネル推定部２３２は、パターン２−１と２−２の場合、第１の実施形態のように、復調処理と干渉除去処理に必要なチャネルのみのチャネル推定処理を行うことで、演算量を削減する。また、このようにチャネル推定部２３２が必要なチャネルの推定処理のみを行う場合は、第１の実施形態のように、干渉除去処理判定部２３３は、チャネル推定部２３２が行ったチャネル推定計算結果のみを用いて、パターン２−１，２−２，２−３の判定を行う。 Here, in the case of patterns 2-1 and 2-2, the channel estimation unit 232 calculates by performing the channel estimation process of only the channels required for the demodulation process and the interference removal process as in the first embodiment. Reduce the amount. Further, when the channel estimation unit 232 only performs the necessary channel estimation processing in this way, the interference elimination processing determination unit 233 may perform the channel estimation calculation result performed by the channel estimation unit 232 as in the first embodiment. Patterns 2-1, 2, 2 and 2-3 are determined using only.

復調処理部２３４は、既知信号・データ信号分離部２３１が出力するデータ信号と、チャネル推定部２３２が出力するチャネル情報を用いて復調処理を行う。すなわち、復調処理部２３４は、干渉除去処理判定部２３３からパターン２−１の結果が入力すると、他のＵＣＡの他のＯＡＭモードからの干渉除去処理を行わずに、各ＵＣＡから同一ＯＡＭモードを用いて送信されたことなる信号間の等化処理を行う。この処理は、ＺＦ等の手法により行えばよい。この処理はＯＡＭモードごとに行う。次に、等化処理後の結果を用いてすべてのデータの復調処理を行う。 The demodulation processing unit 234 performs demodulation processing using the data signal output by the known signal / data signal separation unit 231 and the channel information output by the channel estimation unit 232. That is, when the result of the pattern 2-1 is input from the interference removal processing determination unit 233, the demodulation processing unit 234 performs the same OAM mode from each UCA without performing the interference removal processing from the other OAM modes of the other UCAs. Performs equalization processing between signals that have been transmitted using. This process may be performed by a method such as ZF. This process is performed for each OAM mode. Next, the demodulation process of all the data is performed using the result after the equalization process.

また、干渉除去処理判定部２３３からパターン２−２の結果が入力すると、まず、各ＵＣＡの同一ＯＡＭモード間の等化処理と復調処理を行い、その結果を干渉除去処理部２３５に出力する。また、パターン２−２の場合は、第１の実施形態のように、既知信号・データ信号分離部２３１が復調処理部２３４に出力したデータ信号（復調対象のデータ部分の信号）も合わせて干渉除去処理部２３５に出力する。ここで、干渉除去処理部２３５は、ＳＩＣ処理等による干渉除去処理を行い、その結果を再び復調処理部２３４に入力する。復調処理部２３４は、干渉除去処理部２３５から入力する信号を用いて、再び各ＵＣＡの同一ＯＡＭモード間の等化処理と復調処理を行う。この過程を繰り返すことで、干渉除去処理の性能を向上することができる。該繰り返し処理の終了は、第１の実施形態と同様に行えばよい。 When the result of pattern 2-2 is input from the interference removal processing determination unit 233, first, equalization processing and demodulation processing are performed between the same OAM modes of each UCA, and the result is output to the interference removal processing unit 235. Further, in the case of the pattern 2-2, as in the first embodiment, the data signal (the signal of the data portion to be demodulated) output by the known signal / data signal separation unit 231 to the demodulation processing unit 234 also interferes. Output to the removal processing unit 235. Here, the interference removing processing unit 235 performs the interference removing processing by the SIC processing or the like, and inputs the result to the demodulation processing unit 234 again. The demodulation processing unit 234 again performs equalization processing and demodulation processing between the same OAM modes of each UCA using the signal input from the interference removal processing unit 235. By repeating this process, the performance of the interference removal process can be improved. The end of the iterative process may be performed in the same manner as in the first embodiment.

また、干渉除去処理判定部２３３からパターン２−３の結果が入力すると、各ＵＣＡの各ＯＡＭモードに対するチャネル情報を用いて、ＺＦやＭＭＳＥ法により等化処理を行い、干渉除去処理を行ってから各ＯＡＭモードの復調処理を行う。 Further, when the result of the pattern 2-3 is input from the interference removal processing determination unit 233, the equalization processing is performed by the ZF or MMSE method using the channel information for each OAM mode of each UCA, and then the interference removal processing is performed. Demodulation processing of each OAM mode is performed.

干渉除去処理部２３５の処理は、第１の実施形態と同様である。本実施形態において、複数のＵＣＡから複数のＯＡＭモードを用いて複数の信号を送受信することは、単一のＵＣＡを用いる第１の実施形態と異なるが、第１の実施形態の復調信号とチャネル情報を用いてレプリカを生成し、受信信号からレプリカを引き算してから、改めて、等化処理と復調処理を行う過程を繰り返すことは同様である。 The processing of the interference removing processing unit 235 is the same as that of the first embodiment. In the present embodiment, transmitting and receiving a plurality of signals from a plurality of UCAs using a plurality of OAM modes is different from the first embodiment using a single UCA, but the demodulated signals and channels of the first embodiment. It is the same as repeating the process of generating a replica using the information, subtracting the replica from the received signal, and then performing the equalization process and the demodulation process again.

以下、第２の実施形態の例を数式を用いて説明する。以下の例では、４個のＵＣＡが、それぞれ５個のＯＡＭモード２，１，０，−１，−２を用いてＯＡＭ通信を行う場合を想定する。なお、送信側のＵＣＡをＴx UCA と称し、受信側のＵＣＡをＲx UCA と称する。また、簡単のため図８に示すように、直径が小さいＵＣＡから大きいＵＣＡ順にＵＣＡ１，２，３，４の番号を付ける。すなわち、Ｔx UCA3は、送信側の３番目のＵＣＡを表す。なお、ｋ番目のＵＣＡｋの送信信号をＸi k とし、ｌ番目のＵＣＡｌの受信信号をＹj l とする。ここで、ｉとｊは、ＯＡＭモードの次数を表す。例えば、Ｘ-12 とＹ13は、それぞれ、Ｔx UCA2のＯＡＭモード２の送信信号と、Ｒx UCA3のＯＡＭモード１の受信信号を表す。 Hereinafter, an example of the second embodiment will be described using mathematical formulas. In the following example, it is assumed that four UCAs perform OAM communication using each of the five OAM modes 2, 1, 0, -1, and -2. The UCA on the transmitting side is referred to as Tx UCA, and the UCA on the receiving side is referred to as Rx UCA. Further, for simplicity, as shown in FIG. 8, UCAs 1, 2, 3 and 4 are numbered in order from the UCA having the smallest diameter to the UCA having the largest diameter. That is, Tx UCA3 represents the third UCA on the transmitting side. The transmission signal of the k-th UC Ak is Xi k, and the reception signal of the l-th UC Al is Yj l . Here, i and j represent the order of the OAM mode. For example, X-1 2 and Y1 3 represent a transmission signal of OAM mode 2 of Tx UCA 2 and a reception signal of OAM mode 1 of Rx UCA 3, respectively.

また、送信ＵＣＡk の送信ＯＡＭモードｉと受信ＵＣＡl のＯＡＭモードｊ間のチャネルをＨi,j l,k と表す。なお、送受信信号は、第１の実施形態のように、ＯＦＤＭ方式等のように周波数領域にてデータ変復調を行う通信方式を想定するが、ＳＣ（single carrier）方式等のように時間領域にてデータを変復調する通信方式への適用も同様に可能である。 Further, the channels between the transmission OAM mode i of the transmission UCAk and the OAM mode j of the reception UCAl are represented as Hi, j l, k. The transmitted / received signal is assumed to be a communication method that performs data modulation / demodulation in the frequency domain, such as the OFDM method, as in the first embodiment, but in the time domain, such as the SC (single carrier) method. It can also be applied to a communication method that changes and demolishes data.

本実施形態では、各ＵＣＡの各ＯＡＭモードが異なる信号を送信する通信システムを想定するが、受信電力向上等に向け、ＵＣＡの一部のみを用いて通信を行うことや、ダイバーシティ(diversity) 等の目的に向け各ＵＣＡの同一ＯＡＭモードで同一の信号を送信することも可能である。また、送信側の各ＵＣＡの同一ＯＡＭモードに送信事前処理（プリコーディング）処理を行い、その結果を各ＵＣＡの同一ＯＡＭモードが送信することもできる。すなわち、本実施形態では、送信ＵＣＡの同一ＯＡＭモードは異なる信号を送信し、受信側のＵＣＡのそのＯＡＭモードの信号の等化処理による信号分離を想定するが、送信側がチャネル情報を用いて、事前に等化処理等の事前処理を行う送信することもできる。この場合、受信側の等化処理の必要性がなくなるため、送受信側の信号処理負荷の分担ができる長所がある。 In the present embodiment, a communication system in which each OAM mode of each UCA transmits a different signal is assumed, but in order to improve the received power, communication is performed using only a part of the UCA, diversity, etc. It is also possible to transmit the same signal in the same OAM mode of each UCA for the purpose of. Further, it is also possible to perform transmission preprocessing (precoding) processing in the same OAM mode of each UCA on the transmitting side, and transmit the result by the same OAM mode of each UCA. That is, in the present embodiment, the same OAM mode of the transmitting UCA transmits different signals, and signal separation by equalizing the signal of the OAM mode of the receiving UCA is assumed, but the transmitting side uses the channel information. It is also possible to transmit in advance processing such as equalization processing. In this case, since the need for equalization processing on the receiving side is eliminated, there is an advantage that the signal processing load on the transmitting and receiving side can be shared.

受信装置のＲＦ処理部４２の出力信号の式は、以下の式(7) ようになる。本実施形態でも、第１の実施形態のように、チャネル推定用の既知信号とデータ信号を交互に入力する手法や、ＯＦＤＭの複数のキャリアの一部にチャネル推定用の既知信号を挿入し、内挿（interpolation ）等の手法によりチャネル推定を行う手法等が適用できる。 The formula of the output signal of the RF processing unit 42 of the receiving device is as follows (7). Also in the present embodiment, as in the first embodiment, a method of alternately inputting a known signal for channel estimation and a data signal, or inserting a known signal for channel estimation into a part of a plurality of carriers of OFDM can be performed. A method of channel estimation by a method such as interpolation can be applied.

Figure 0006962135
Figure 0006962135

ここで、Ｎj l は、受信側のｌ番目のＵＣＡｌのＯＡＭモードｊの雑音成分を表す。ここで、チャネル推定部は、既知信号を用いてチャネル推定を行う。すなわち、各ＵＣＡの各ＯＡＭモード間のチャネル推定を行い、Ｈi,j l,k 部分を計算する。チャネル推定処理の結果は干渉除去処理判定部に入力される。 Here, Nj l represents the noise component of the OAM mode j of the l-th UCAl on the receiving side. Here, the channel estimation unit performs channel estimation using known signals. That is, channel estimation is performed between each OAM mode of each UCA, and Hi, j l, and k parts are calculated. The result of the channel estimation process is input to the interference elimination process determination unit.

干渉除去処理判定部は、すべてのＨi,j l,k の絶対値（もしくは絶対値の２乗）と、所定の閾値３との比較を行い、パターン２−１，２−２，２−３の判定を行う。 The interference removal processing determination unit compares the absolute values (or the squares of the absolute values) of all Hi, j l, and k with the predetermined threshold value 3, and patterns 2-1, 2, 2 and 2-3. Is judged.

パターン２−１の場合は、各ＵＣＡの異なるＯＡＭモードからの干渉を無視してもよい。すなわち、式(7) を式(8) のように、ＯＡＭモードごとに分離して考えてもよい。 In the case of pattern 2-1 the interference from different OAM modes of each UCA may be ignored. That is, Eq. (7) may be considered separately for each OAM mode as in Eq. (8).

Figure 0006962135
Figure 0006962135

ここで、（Ｎjl)'は、パターン２−１におけるｌ番目の受信ＵＣＡｌのＯＡＭモードｊ
の雑音を表す。このパターンでは、異なるＯＡＭモード間の干渉は無視するため、無視される他のＯＡＭモードからの干渉も雑音成分に含めて表す。次に、受信側の各ＵＣＡの同一ＯＡＭモード間の信号の等化処理を行う。すなわち、式(9) のようにＯＡＭモードごとの等化処理を行う。 Here, (Nj l )'is the OAM mode j of the first received UCAl in the pattern 2-1.
Represents the noise of. In this pattern, interference between different OAM modes is ignored, so interference from other OAM modes that are ignored is also included in the noise component. Next, the signal equalization processing between the same OAM modes of each UCA on the receiving side is performed. That is, equalization processing is performed for each OAM mode as shown in Eq. (9).

Figure 0006962135
Figure 0006962135

ここで、Ｅq( )は等化処理を表す。なお、式(9) のＸikは、ｋ番目の送信ＵＣＡｋのＯ
ＡＭモードｉの送信信号の等化処理後の値を表す。なお、Ｘの上につく「＾」や「・」は文中では省略している（以下同様）。この等化処理は、チャネル推定結果と受信ＵＣＡの信号を用いて、ＺＦやＭＭＳＥ等の手法により行えばよい。 Here, Eq () represents an equalization process. Note that Xi k in Eq. (9) is O of the kth transmission UCA k.
It represents the value after the equalization processing of the transmission signal of AM mode i. The "^" and "・" above X are omitted in the text (the same applies hereinafter). This equalization processing may be performed by a method such as ZF or MMSE using the channel estimation result and the signal of the received UCA.

次に、等化処理後の結果を用いて復調処理を行う。式(10)のＸikは、ｋ番目の送信ＵＣ
ＡｋのＯＡＭモードｉの送信信号の等化処理後の信号の復調信号を表す。なお、demod( )は、チャネル符号の復号処理等を含む復調処理を表す。 Next, the demodulation process is performed using the result after the equalization process. Xi k in equation (10) is the kth transmission UC.
It represents the demodulated signal of the signal after the equalization processing of the transmission signal of the OAM mode i of Ak. Note that demod () represents a demodulation process including a channel code decoding process and the like.

Figure 0006962135
Figure 0006962135

パターン２−２の場合は、まず、式(8) のように各ＵＣＡの異なるＯＡＭモードからの干渉を無視してから、式(9) と式(10)のように、各ＵＣＡの同一ＯＡＭモード間の等化処理と復調処理を行い、それらの結果を用いてレプリカを生成し、干渉除去処理の対象となるＯＡＭモード組の干渉除去処理を行う。ここで、干渉除去処理の対象でないＯＡＭモード間の干渉は雑音とみなす。式(7) の受信信号を、各送信ＵＣＡの異なるＯＡＭモードからの干渉成分と同一ＯＡＭモードからの信号に分けると式(11)となる。 In the case of pattern 2-2, first, interference from different OAM modes of each UCA is ignored as in Eq. (8), and then the same OAM of each UCA as in Eqs. (9) and (10). Equalization processing and demodulation processing between modes are performed, replicas are generated using the results, and interference removal processing of the OAM mode set that is the target of interference removal processing is performed. Here, interference between OAM modes that are not subject to interference removal processing is regarded as noise. When the received signal of the equation (7) is divided into the interference component from the different OAM mode of each transmission UCA and the signal from the same OAM mode, the equation (11) is obtained.

Figure 0006962135
Figure 0006962135

式(11)には、各ＵＣＡの異なるＯＡＭモードからの信号がすべて表されているが、干渉除去処理判定部により、干渉除去処理対象となる信号のみを残し、式(12)のように、他の干渉除去処理の対象でないＯＡＭモード間の干渉は雑音とみなす。 Equation (11) represents all the signals from different OAM modes of each UCA, but the interference elimination processing determination unit leaves only the signals to be the interference elimination processing, and as in equation (12), Interference between OAM modes that are not subject to other interference removal processing is considered noise.

Figure 0006962135
Figure 0006962135

ここで、第２項のＩは、干渉除去処理判定部により干渉除去対象となるＯＡＭモードの
総数を表し、（Ｎj l)* は、それに含まれてない干渉成分を雑音としてみなした場合の雑
音を表す。本パターンのＳＩＣ処理後の信号は式(13)のように計算する。 Here, I in the second term represents the total number of OAM modes targeted for interference removal by the interference removal processing determination unit, and (Nj l ) * is noise when interference components not included in the interference component are regarded as noise. Represents. The signal after SIC processing of this pattern is calculated as in Eq. (13).

Figure 0006962135
Figure 0006962135

ここで、Ｙjlは、受信装置のｌ番目のＵＣＡｌのＯＡＭモードｊのＳＩＣ処理後の結果を表す。なお、mod(Ｘik）は、送信側のｋ番目のＵＣＡｋのＯＡＭモードｉの送信信号の
レプリカを表す。mod( ) は、送信装置が行ったチャネル符号化処理を含む変調処理を表す。すなわち、式(13)は、式(10)の復調後の信号と、チャネル推定結果と、ＳＩＣ処理対象をＯＡＭモード組を表すＩを用いて、信号のレプリカを生成し、受信信号がらそのレプリカを引き算する処理を表す。 Here, Yj l represents the result of the l-th UCAl of the receiving device after the SIC processing in the OAM mode j. Note that mod (Xi k ) represents a replica of the transmission signal of the OAM mode i of the kth UC Ak on the transmitting side. mod () represents the modulation process including the channel coding process performed by the transmitter. That is, the equation (13) generates a replica of the signal by using the signal after the demodulation of the equation (10), the channel estimation result, and I representing the OAM mode set as the SIC processing target, and the replica of the received signal. Represents the process of subtracting.

次に、干渉除去処理は、式(13)の計算結果（Ｙ-21 ，Ｙ-11 ，Ｙ01 ，Ｙ11 ，Ｙ21）を
復調処理部に入力する。ここで、ｌは受信ＵＣＡｌの数を意味するため、この例では、20個の計算結果が入力される。 Next, in the interference removal processing, the calculation results of Eq. (13) (Y-2 1 , Y-1 1 , Y0 1 , Y1 1 , Y2 1 ) are input to the demodulation processing unit. Here, l means the number of received UCAl, so in this example, 20 calculation results are input.

信号復調部は、式(14)のように等化処理を行う。

Figure 0006962135
The signal demodulation unit performs equalization processing as shown in Eq. (14).
Figure 0006962135

ここで、式(9) では、Ｙj l を用いて等化処理を行っていたが、式(14)では、ＳＩＣ処理後の結果であるを用いて等化処理を行う。 Here, in Eq. (9), the equalization process was performed using Yj l , but in Eq. (14), the equalization process is performed using the result after the SIC process.

次に、式(14)の結果を用いて、式(10)で表す復調処理を改めて行う。このパターン２−２では、このような復調処理とレプリカ生成による干渉処理を繰り返して行う。繰り返しの終了は、実施形態１と同様にすればよい。 Next, using the result of Eq. (14), the demodulation process represented by Eq. (10) is performed again. In this pattern 2-2, such demodulation processing and interference processing by replica generation are repeated. The end of the repetition may be the same as in the first embodiment.

パターン２−３では、式(7) のすべての項を用いて、ＺＦやＭＭＳＥ等によりすべてのＯＡＭモードの信号に対し、同時に等化処理を行ってから、各ＯＡＭモードの復調処理を行う。 In pattern 2-3, all the terms of the equation (7) are used to simultaneously perform equalization processing on all OAM mode signals by ZF, MMSE, or the like, and then demodulation processing of each OAM mode is performed.

このような第２の実施形態は、第１の実施形態と同様の効果がある。すなわち、本発明により、軸ズレやＲＦの不完全性によりＯＡＭモード間の干渉が生じた場合、ＯＡＭモード間の干渉量を考慮して、その処理を要するＯＡＭモード間のみで行うことにより、干渉除去に必要な演算量を削減することができる。また、チャネル推定の演算量の削減も可能となる。特に、ＧＰＳや工学位置調整器なのにより、荒い軸ズレはできたが、精密な軸合わせができなかった場合等、パターン２−２が主となる無線通信環境では、特に演算量の削減効果が大きくなる。また、チャネルの時変動により。パターン２−１，２−２，２−３が時変動する場合、本発明によりチャネル状況に合わせて、適切にＯＡＭモード間干渉除去処理を行うことができるため、常に干渉除去処理をしない手法に比べて、性能改善効果が得られ、また、常にすべてのＯＡＭモードに対する干渉除去処理を行う手法に比べて、演算量削減ができる。 Such a second embodiment has the same effect as the first embodiment. That is, according to the present invention, when interference between OAM modes occurs due to axis misalignment or RF imperfections, the interference between OAM modes is taken into consideration, and interference is performed only between OAM modes that require the processing. The amount of calculation required for removal can be reduced. In addition, the amount of calculation for channel estimation can be reduced. In particular, in a wireless communication environment where pattern 2-2 is the main, such as when rough axis misalignment is possible due to GPS or engineering position adjuster, but precise axis alignment is not possible, the effect of reducing the amount of calculation is particularly effective. growing. Also, due to channel time fluctuations. When the patterns 2-1, 2, 2 and 2-3 fluctuate with time, the interference removal processing between OAM modes can be appropriately performed according to the channel condition according to the present invention. In comparison, the performance improvement effect can be obtained, and the amount of calculation can be reduced as compared with the method in which the interference removal processing for all OAM modes is always performed.

（第３の実施形態）
第３の実施形態は、第１の実施形態および第２の実施形態において、ＯＡＭビームの特性を用いて、干渉除去処理の負荷をさらに軽減する実施形態である。 (Third Embodiment)
The third embodiment is an embodiment in which the load of the interference removing process is further reduced by using the characteristics of the OAM beam in the first embodiment and the second embodiment.

干渉除去処理判定部は、符号だけ異なるＯＡＭモードの干渉のパターンは、類似である特徴を用いて、正の符号のＯＡＭモード同士のみで、干渉除去処理の必要性を判断することで、全体の処理量を減らすことができる。例えば、ＯＡＭモード１からＯＡＭモード2 への干渉の度合いと、ＯＡＭモード１からＯＡＭモード２への干渉の度合いは類似であるため、一方のパターンのみの干渉の度合いだけで閾値と比較することで、全体の信号処理負荷をさらに削減する。また、本発明をデジタルチップ等を用いて実装する際にも正の符号のＯＡＭモード間だけの干渉度合いを判定する回路のみを実装することで、全体の回路規模の削減が可能となる。 The interference elimination processing determination unit determines the necessity of interference elimination processing as a whole by using the characteristics that the interference patterns of the OAM modes differing only in the sign are similar to each other and only the OAM modes having a positive sign. The amount of processing can be reduced. For example, since the degree of interference from OAM mode 1 to OAM mode 2 and the degree of interference from OAM mode 1 to OAM mode 2 are similar, it is possible to compare the degree of interference with only one pattern with the threshold value. , Further reduce the overall signal processing load. Further, even when the present invention is mounted using a digital chip or the like, the overall circuit scale can be reduced by mounting only a circuit that determines the degree of interference only between OAM modes having a positive sign.

１１，３１ デジタル信号処理部
１２，３２ ＲＦ処理部
１３，３３ 送信アンテナ部
２１，４１ 受信アンテナ部
２２，４２ ＲＦ処理部
２３，４３ デジタル信号処理部
２３１ 既知信号・データ信号分離部
２３２ チャネル推定部
２３３ 干渉除去処理判定部
２３４ 復調処理部
２３５ 干渉除去処理部
11,31 Digital signal processing unit 12,32 RF processing unit 13,33 Transmitting antenna unit 21,41 Receiving antenna unit 22,42 RF processing unit 23,43 Digital signal processing unit 231 Known signal / data signal separation unit 232 Channel estimation unit 233 Interference removal processing judgment unit 234 Demodulation processing unit 235 Interference removal processing unit

Claims (10)

複数のアンテナ素子を円形に等間隔に配置した等間隔円形アレーアンテナ（以下、ＵＣＡ）を送信装置と受信装置に備え、送信装置のＵＣＡで複数のＯＡＭモードの信号を生成して送信し、受信装置のＵＣＡで複数のＯＡＭモードの信号を受信して分離し、ＯＡＭモード数の信号を空間多重伝送するＯＡＭ多重通信システムにおいて、
前記受信装置は、ＯＡＭモード間のチャネル情報を用いて、所定の閾値１より大きい干渉を及ぼすＯＡＭモード間を判定し、該所定の閾値１より大きい干渉を及ぼすＯＡＭモード組数に応じて指定されたＯＡＭモード間の干渉除去処理を行う干渉除去手段を備えた
ことを特徴とするＯＡＭ多重通信システム。 Equally spaced circular array antennas (hereinafter referred to as UCA) in which a plurality of antenna elements are arranged in a circle at equal intervals are provided in the transmitting device and the receiving device, and the UCA of the transmitting device generates and transmits a plurality of OAM mode signals and receives them. In an OAM multiplex communication system in which a plurality of OAM mode signals are received and separated by the UCA of the device and spatial multiplex transmission of signals of the number of OAM modes is performed.
The receiving device uses channel information between OAM modes to determine between OAM modes that cause interference greater than a predetermined threshold value 1, and is designated according to the number of OAM mode groups that cause interference greater than the predetermined threshold value 1. OAM multiplex communication system characterized by comprising interference cancellation means for performing interference cancellation process between OAM mode. 複数のアンテナ素子を円形に等間隔に配置した等間隔円形アレーアンテナ（以下、ＵＣＡ）を送信装置と受信装置に備え、送信装置のＵＣＡで複数のＯＡＭモードの信号を生成して送信し、受信装置のＵＣＡで複数のＯＡＭモードの信号を受信して分離し、ＯＡＭモード数の信号を空間多重伝送するＯＡＭ多重通信システムにおいて、
前記受信装置は、ＯＡＭモード間のチャネル情報を用いて、所定の閾値１より大きい干渉を及ぼすＯＡＭモード間を判定し、そのＯＡＭモード間の干渉除去処理を行う干渉除去手段を備え、
前記干渉除去手段は、
前記各ＯＡＭモード間の干渉信号電力を計算し、その最大干渉信号電力が前記所定の閾値１以下の場合は、ＯＡＭモード間の干渉除去処理を行わずに、各ＯＡＭモードの受信信号の復調処理を行う処理手段１と、
前記各ＯＡＭモード間の干渉信号電力を計算し、その干渉信号電力が前記閾値１より大きいＯＡＭモード組数が所定の閾値２以下の場合は、干渉信号電力が閾値１以下のＯＡＭモード間を除くＯＡＭモード間のみの干渉除去処理を行い、各ＯＡＭモードの受信信号の復調処理を行う処理手段２と、
前記各ＯＡＭモード間の干渉信号電力を計算し、その干渉信号電力が前記閾値１より大きいＯＡＭモード組数が前記所定の閾値２より大きい場合は、各ＯＡＭモードのすべての受信信号とすべてのＯＡＭモード間のチャネル情報を用いて干渉除去処理を行い、各ＯＡＭモードの受信信号の復調処理を行う処理手段３と
を備えた構成であることを特徴とするＯＡＭ多重通信システム。 Equally spaced circular array antennas (hereinafter referred to as UCA) in which a plurality of antenna elements are arranged in a circle at equal intervals are provided in the transmitting device and the receiving device, and the UCA of the transmitting device generates and transmits a plurality of OAM mode signals and receives them. In an OAM multiplex communication system in which a plurality of OAM mode signals are received and separated by the UCA of the device and spatial multiplex transmission of signals of the number of OAM modes is performed.
The receiving device includes interference removing means for determining between OAM modes that cause interference larger than a predetermined threshold value 1 using channel information between OAM modes and performing interference removing processing between the OAM modes.
The interference removing means is
The interference signal power between the OAM modes is calculated, and when the maximum interference signal power is equal to or less than the predetermined threshold value 1, the reception signal demodulation process of each OAM mode is performed without performing the interference removal process between the OAM modes. Processing means 1 to perform
The interference signal power between the OAM modes is calculated, and when the number of OAM mode sets whose interference signal power is larger than the threshold value 1 is a predetermined threshold value 2 or less, the interference signal power between the OAM modes whose interference signal power is the threshold value 1 or less is excluded. Processing means 2 that performs interference removal processing only between OAM modes and demodulates the received signal of each OAM mode, and
The interference signal power between the OAM modes is calculated, and when the interference signal power is larger than the threshold value 1 and the number of OAM mode groups is larger than the predetermined threshold value 2, all the received signals in each OAM mode and all the OAMs are used. An OAM multiplex communication system including a processing means 3 that performs interference removal processing using channel information between modes and demodulates reception signals of each OAM mode. 複数のアンテナ素子を円形に等間隔に配置した等間隔円形アレーアンテナ（以下、ＵＣＡ）を送信装置と受信装置に備え、送信装置のＵＣＡで複数のＯＡＭモードの信号を生成して送信し、受信装置のＵＣＡで複数のＯＡＭモードの信号を受信して分離し、ＯＡＭモード数の信号を空間多重伝送するＯＡＭ多重通信システムにおいて、
前記受信装置は、ＯＡＭモード間のチャネル情報を用いて、所定の閾値１より大きい干渉を及ぼすＯＡＭモード間を判定し、そのＯＡＭモード間の干渉除去処理を行う干渉除去手段を備え、
前記干渉除去手段は、所定の時間間隔ごとにすべてのＯＡＭモード間のチャネル情報を取得し、その区間は、前記所定の閾値１より大きい干渉を及ぼすＯＡＭモード間のみのチャネル情報を取得する構成である
ことを特徴とするＯＡＭ多重通信システム。 Equally spaced circular array antennas (hereinafter referred to as UCA) in which a plurality of antenna elements are arranged in a circle at equal intervals are provided in the transmitting device and the receiving device, and the UCA of the transmitting device generates and transmits a plurality of OAM mode signals and receives them. In an OAM multiplex communication system in which a plurality of OAM mode signals are received and separated by the UCA of the device and spatial multiplex transmission of signals of the number of OAM modes is performed.
The receiving device includes interference removing means for determining between OAM modes that cause interference larger than a predetermined threshold value 1 using channel information between OAM modes and performing interference removing processing between the OAM modes.
The interference removing means acquires channel information between all OAM modes at predetermined time intervals, and the section acquires channel information only between OAM modes that cause interference larger than the predetermined threshold value 1. An OAM multiplex communication system characterized by being present. 複数のアンテナ素子を円形に等間隔に配置した等間隔円形アレーアンテナ（以下、ＵＣＡ）を、同心円状に配置した複数のＵＣＡからなるＭ−ＵＣＡを送信装置と受信装置に備え、送信装置の各ＵＣＡでそれぞれ複数のＯＡＭモードの信号を生成して送信し、受信装置の各ＵＣＡでそれぞれ複数のＯＡＭモードの信号を受信して分離し、ＵＣＡ数×ＯＡＭモード数の信号を空間多重伝送するＯＡＭ多重通信システムにおいて、
前記受信装置は、前記送信装置は各ＵＣＡの各ＯＡＭモード間のチャネル情報を用いて、各ＵＣＡで受信する同一ＯＡＭモード間の信号分離を行うとともに、所定の閾値３より大きい干渉を及ぼすＯＡＭモード間を判定し、そのＯＡＭモード間の干渉除去処理を行う干渉除去手段を備えた
ことを特徴とするＯＡＭ多重通信システム。 Each of the transmitting devices is provided with M-UCA consisting of a plurality of UCAs arranged concentrically with an evenly spaced circular array antenna (hereinafter referred to as UCA) in which a plurality of antenna elements are arranged at equal intervals in a circle. Each UCA generates and transmits a plurality of OAM mode signals, each UCA of the receiving device receives and separates a plurality of OAM mode signals, and spatially multiplex-transmits a signal of the number of UCA × the number of OAM modes. In multiplex communication system
In the receiving device, the transmitting device uses the channel information between the OAM modes of each UCA to perform signal separation between the same OAM modes received by each UCA, and the OAM mode that causes interference larger than a predetermined threshold value 3. An OAM multiplex communication system including an interference removing means for determining an interval and performing an interference removing process between the OAM modes. 請求項４に記載のＯＡＭ多重通信システムにおいて、
前記干渉除去手段は、
前記複数のＵＣＡの各ＯＡＭモード間の干渉信号電力を計算し、その最大干渉信号電力が前記所定の閾値３以下の場合は、ＯＡＭモード間の干渉除去処理を行わずに、各ＵＣＡにおける同一ＯＡＭモード間の等化処理による信号分離処理を行い、分離後の各ＯＡＭモードの受信信号の復調処理を行う処理手段１と、
前記複数のＵＣＡの各ＯＡＭモード間の干渉信号電力を計算し、その干渉信号電力が前記閾値３より大きいＯＡＭモード組数が所定の閾値４以下の場合は、干渉信号電力が閾値３以下のＯＡＭモード間を除くＯＡＭモード間のみの干渉除去処理を行い、各ＵＣＡの各ＯＡＭモードの受信信号の復調処理を行う処理手段２と、
前記複数のＵＣＡの各ＯＡＭモード間の干渉信号電力を計算し、その干渉信号電力が前記閾値３より大きいＯＡＭモード組数が所定の閾値４より大きい場合は、各ＵＣＡの各ＯＡＭモードのすべての受信信号と、すべてＵＣＡのＯＡＭモード間のチャネル情報を用いて干渉除去処理を行い、各ＵＣＡの各ＯＡＭモードの受信信号の復調処理を行う処理手段３と
を備えた構成であることを特徴とするＯＡＭ多重通信システム。 In the OAM multiplex communication system according to claim 4,
The interference removing means is
The interference signal power between the OAM modes of the plurality of UCAs is calculated, and when the maximum interference signal power is 3 or less of the predetermined threshold value, the same OAM in each UCA is performed without performing the interference elimination processing between the OAM modes. Processing means 1 that performs signal separation processing by equalization processing between modes and demodulates the received signal of each OAM mode after separation.
The interference signal power between each OAM mode of the plurality of UCAs is calculated, and when the number of OAM mode sets whose interference signal power is larger than the threshold value 3 is a predetermined threshold value 4 or less, the interference signal power is an OAM having a threshold value 3 or less. Processing means 2 that performs interference removal processing only between OAM modes excluding between modes, and demodulates the received signal of each OAM mode of each UCA.
The interference signal power between each OAM mode of the plurality of UCAs is calculated, and when the number of OAM mode sets whose interference signal power is larger than the threshold value 3 is larger than the predetermined threshold value 4, all of the OAM modes of each UCA. The configuration is characterized by including a processing means 3 that performs interference elimination processing using the received signal and channel information between all UCA OAM modes, and demodulates the received signal of each OAM mode of each UCA. OAM multiplex communication system. 請求項４または請求項５に記載のＯＡＭ多重通信システムにおいて、
前記干渉除去手段は、所定の時間間隔ごとにすべてのＯＡＭモード間のチャネル情報を取得し、その区間は、前記所定の閾値３より大きい干渉を及ぼすＯＡＭモード間のみのチャネル情報を取得する構成である
ことを特徴とするＯＡＭ多重通信システム。 In the OAM multiplex communication system according to claim 4 or 5.
The interference removing means acquires channel information between all OAM modes at predetermined time intervals, and the section acquires channel information only between OAM modes that cause interference larger than the predetermined threshold value 3. An OAM multiplex communication system characterized by being present. 複数のアンテナ素子を円形に等間隔に配置した等間隔円形アレーアンテナ（以下、ＵＣＡ）を送信装置と受信装置に備え、送信装置のＵＣＡで複数のＯＡＭモードの信号を生成して送信し、受信装置のＵＣＡで複数のＯＡＭモードの信号を受信して分離し、ＯＡＭモード数の信号を空間多重伝送するＯＡＭ多重通信方法において、
前記受信装置は、ＯＡＭモード間のチャネル情報を用いて、所定の閾値１より大きい干渉を及ぼすＯＡＭモード間を判定し、該所定の閾値１より大きい干渉を及ぼすＯＡＭモード組数に応じて指定されたＯＡＭモード間の干渉除去処理を行う
ことを特徴とするＯＡＭ多重通信方法。 Equally spaced circular array antennas (hereinafter referred to as UCA) in which a plurality of antenna elements are arranged in a circle at equal intervals are provided in the transmitting device and the receiving device, and the UCA of the transmitting device generates, transmits, and receives a plurality of OAM mode signals. In the OAM multiplex communication method in which a plurality of OAM mode signals are received and separated by the UCA of the device, and signals of the number of OAM modes are spatially multiplex-transmitted.
The receiving device uses channel information between OAM modes to determine between OAM modes that cause interference greater than a predetermined threshold value 1, and is designated according to the number of OAM mode groups that cause interference greater than the predetermined threshold value 1. An OAM multiplex communication method characterized by performing interference elimination processing between OAM modes. 複数のアンテナ素子を円形に等間隔に配置した等間隔円形アレーアンテナ（以下、ＵＣＡ）を送信装置と受信装置に備え、送信装置のＵＣＡで複数のＯＡＭモードの信号を生成して送信し、受信装置のＵＣＡで複数のＯＡＭモードの信号を受信して分離し、ＯＡＭモード数の信号を空間多重伝送するＯＡＭ多重通信方法において、Equally spaced circular array antennas (hereinafter referred to as UCA) in which a plurality of antenna elements are arranged in a circle at equal intervals are provided in the transmitting device and the receiving device, and the UCA of the transmitting device generates, transmits, and receives a plurality of OAM mode signals. In the OAM multiplex communication method in which a plurality of OAM mode signals are received and separated by the UCA of the device, and signals of the number of OAM modes are spatially multiplex-transmitted.
前記受信装置は、ＯＡＭモード間のチャネル情報を用いて、所定の閾値１より大きい干渉を及ぼすＯＡＭモード間を判定し、そのＯＡＭモード間の干渉除去処理を行った上で、各ＯＡＭモードの受信信号の復調処理を行い、The receiving device uses the channel information between the OAM modes to determine between the OAM modes that cause interference larger than a predetermined threshold value 1, performs interference elimination processing between the OAM modes, and then receives each OAM mode. Performs signal demodulation processing and
前記干渉除去処理では、In the interference removal process,
前記各ＯＡＭモード間の干渉信号電力を計算し、The interference signal power between each OAM mode is calculated and
計算された最大干渉信号電力が前記所定の閾値１以下の場合は、ＯＡＭモード間の干渉除去処理を行わず、When the calculated maximum interference signal power is equal to or less than the predetermined threshold value 1, the interference elimination process between the OAM modes is not performed.
計算された干渉信号電力が前記閾値１より大きいＯＡＭモード組数が所定の閾値２以下の場合は、干渉信号電力が閾値１以下のＯＡＭモード間を除くＯＡＭモード間のみの干渉除去処理を行い、When the calculated interference signal power is greater than the threshold value 1 and the number of OAM mode sets is a predetermined threshold value 2 or less, interference removal processing is performed only between the OAM modes excluding the OAM modes whose interference signal power is the threshold value 1 or less.
計算された干渉信号電力が前記閾値１より大きいＯＡＭモード組数が前記所定の閾値２より大きい場合は、各ＯＡＭモードのすべての受信信号とすべてのＯＡＭモード間のチャネル情報を用いて干渉除去処理を行うWhen the calculated interference signal power is larger than the threshold value 1 and the number of OAM mode sets is larger than the predetermined threshold value 2, the interference removal process is performed using all the received signals of each OAM mode and the channel information between all the OAM modes. I do
ことを特徴とするＯＡＭ多重通信方法。An OAM multiplex communication method characterized by this. 複数のアンテナ素子を円形に等間隔に配置した等間隔円形アレーアンテナ（以下、ＵＣＡ）を送信装置と受信装置に備え、送信装置のＵＣＡで複数のＯＡＭモードの信号を生成して送信し、受信装置のＵＣＡで複数のＯＡＭモードの信号を受信して分離し、ＯＡＭモード数の信号を空間多重伝送するＯＡＭ多重通信方法において、Equally spaced circular array antennas (hereinafter referred to as UCA) in which a plurality of antenna elements are arranged in a circle at equal intervals are provided in the transmitting device and the receiving device, and the UCA of the transmitting device generates and transmits a plurality of OAM mode signals and receives them. In the OAM multiplex communication method in which a plurality of OAM mode signals are received and separated by the UCA of the apparatus, and signals of the number of OAM modes are spatially multiplex-transmitted.
前記受信装置は、ＯＡＭモード間のチャネル情報を用いて、所定の閾値１より大きい干渉を及ぼすＯＡＭモード間を判定し、そのＯＡＭモード間の干渉除去処理を行い、The receiving device uses the channel information between the OAM modes to determine between the OAM modes that cause interference larger than a predetermined threshold value 1, and performs interference removal processing between the OAM modes.
前記干渉除去処理では、所定の時間間隔ごとにすべてのＯＡＭモード間のチャネル情報を取得し、その区間は、前記所定の閾値１より大きい干渉を及ぼすＯＡＭモード間のみのチャネル情報を取得するIn the interference removal process, channel information between all OAM modes is acquired at predetermined time intervals, and the section acquires channel information only between OAM modes that cause interference greater than the predetermined threshold value 1.
ことを特徴とするＯＡＭ多重通信方法。An OAM multiplex communication method characterized by this. 複数のアンテナ素子を円形に等間隔に配置した等間隔円形アレーアンテナ（以下、ＵＣＡ）を、同心円状に配置した複数のＵＣＡからなるＭ−ＵＣＡを送信装置と受信装置に備え、送信装置の各ＵＣＡでそれぞれ複数のＯＡＭモードの信号を生成して送信し、受信装置の各ＵＣＡでそれぞれ複数のＯＡＭモードの信号を受信して分離し、ＵＣＡ数×ＯＡＭモード数の信号を空間多重伝送するＯＡＭ多重通信方法において、
前記受信装置は、前記送信装置は各ＵＣＡの各ＯＡＭモード間のチャネル情報を用いて、各ＵＣＡで受信する同一ＯＡＭモード間の信号分離を行うとともに、所定の閾値３より
大きい干渉を及ぼすＯＡＭモード間を判定し、そのＯＡＭモード間の干渉除去処理を行う
ことを特徴とするＯＡＭ多重通信方法。 Each of the transmitting devices is provided with M-UCA consisting of a plurality of UCAs arranged concentrically with an evenly spaced circular array antenna (hereinafter referred to as UCA) in which a plurality of antenna elements are arranged at equal intervals in a circle. Each UCA generates and transmits a plurality of OAM mode signals, each UCA of the receiving device receives and separates a plurality of OAM mode signals, and spatially multiplex-transmits a signal of the number of UCA × the number of OAM modes. In the multiplex communication method
In the receiving device, the transmitting device uses the channel information between the OAM modes of each UCA to perform signal separation between the same OAM modes received by each UCA, and the OAM mode that causes interference larger than a predetermined threshold value 3. An OAM multiplex communication method characterized in that an interval is determined and interference elimination processing between the OAM modes is performed.
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