JP4435039B2 - Spatial multiplexing transmission apparatus and spatial multiplexing control method - Google Patents

Spatial multiplexing transmission apparatus and spatial multiplexing control method Download PDF

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JP4435039B2
JP4435039B2 JP2005201554A JP2005201554A JP4435039B2 JP 4435039 B2 JP4435039 B2 JP 4435039B2 JP 2005201554 A JP2005201554 A JP 2005201554A JP 2005201554 A JP2005201554 A JP 2005201554A JP 4435039 B2 JP4435039 B2 JP 4435039B2
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泰司 鷹取
健太郎 西森
理一 工藤
光一 常川
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Description

本発明は、無線通信システム用アンテナにより、空間多重伝送を行う空間多重伝送用送信装置及び空間多重伝送制御方法に関する。   The present invention relates to a spatial multiplexing transmission apparatus and a spatial multiplexing transmission control method for performing spatial multiplexing transmission using an antenna for a radio communication system.

従来、直交性を利用して周波数軸上でのオーバーラップを許容し、中心周波数が異なる複数の搬送波を利用することで、高い周波数効率を実現する送信装置として直交波周波数分割多重送信装置が知られている。また、複数のアンテナ素子から異なる信号を送信することで、周波数帯域を増大させることなしに高速伝送を実現する送信装置として空間多重伝送用送信装置が知られている。   Conventionally, an orthogonal frequency division multiplex transmission apparatus is known as a transmission apparatus that achieves high frequency efficiency by using orthogonality to allow overlap on the frequency axis and using a plurality of carriers having different center frequencies. It has been. Also, a spatial multiplexing transmission apparatus is known as a transmission apparatus that realizes high-speed transmission without increasing the frequency band by transmitting different signals from a plurality of antenna elements.

図７は、非特許文献１に開示されるマルチビームを形成することで、伝送品質を改善する空間多重伝送用送信装置７００の内部構成を示したブロック図である。   FIG. 7 is a block diagram illustrating an internal configuration of a spatial multiplexing transmission apparatus 700 that improves transmission quality by forming a multi-beam disclosed in Non-Patent Document 1.

空間多重伝送用送信装置７００は、シリアル−パラレル（Ｓ／Ｐ：Serial/Parallel）変換器７０１と、送信部７１１〜７１Ｌと、マルチビーム形成部７２１〜７２Ｌと、信号合成部７３１〜７３Ｎと、切り替え部７４１〜７４Ｎと、送信用アンテナ素子７５１〜７５Ｎと、送信重み決定部７６０とを備えている。   The spatial multiplexing transmission apparatus 700 includes a serial / parallel (S / P) converter 701, transmission units 711 to 71L, multi-beam forming units 721 to 72L, signal synthesis units 731 to 73N, Switching units 741 to 74N, transmitting antenna elements 751 to 75N, and a transmission weight determining unit 760 are provided.

以下に、空間多重伝送用送信装置７００の動作について説明する。最初に、Ｓ／Ｐ変換器７０１は入力される送信信号から複数の信号系列Ｔ１〜ＴＥを生成する。送信部７１１〜７１Ｌは、Ｓ／Ｐ変換器７０１によって生成される複数の信号系列Ｔ１〜ＴＥから、Ｌ系列からなる送信信号系列を形成する。マルチビーム形成部７２１〜７２Ｌは、各々送信重み決定部７６０により算出される重みに基づいて、各送信用アンテナ素子７５１〜７５Ｎに対して異なった指向性を形成する出力信号を形成する。そして、信号合成部７３１〜７３Ｎは、同一の送信用アンテナ素子７５１〜７５Ｎに対してマルチビーム形成部７２１から７２Ｌから出力された出力信号を足し合わせて、切り替え部７４１〜７４Ｎに入力する。切り替え部７４１〜７４Ｎは、信号合成部７３１〜７３Ｎによって足し合わされた出力信号を、同一の時刻、かつ同一の周波数でそれぞれに対応する送信用アンテナ素子７５１〜７５Ｎから送信する。 Hereinafter, the operation of the spatial multiplexing transmission apparatus 700 will be described. First, the S / P converter 701 generates a plurality of signal sequences T 1 to T E from the input transmission signal. Transmitting sections 711 to 71L form a transmission signal sequence composed of L sequences from a plurality of signal sequences T 1 to T E generated by S / P converter 701. The multi-beam forming units 721 to 72L form output signals that form different directivities for the respective transmitting antenna elements 751 to 75N based on the weights calculated by the transmission weight determining unit 760, respectively. Then, the signal combining units 731 to 73N add the output signals output from the multi-beam forming units 721 to 72L to the same transmitting antenna elements 751 to 75N, and input them to the switching units 741 to 74N. The switching units 741 to 74N transmit the output signals added by the signal synthesis units 731 to 73N from the corresponding transmitting antenna elements 751 to 75N at the same time and the same frequency.

ここで、重み決定部７６０はマルチビーム形成部７２１〜７２Ｌが形成する出力信号に対する重みを次のようにして算出する。まず、伝達係数行列Ｈの特異値分解(Ｈ＝ＵＤＶＨ)を行い、ユニタリ行列Ｕ、Ｖ及び特異値√λを対角要素とする対角行列Ｄを算出する。送信アンテナ数をＮ、受信アンテナ数をＭとし、ＸをＭとＮのうち小さい方の数字とし、ｕ１〜ｕｘをＭ×１の列ベクトル、ｖ１〜ｖｘをＮ×１の列ベクトル、上添え字Ｈは共役転置を表すものとすると、伝達係数行列は次式（１）で表される。 Here, the weight determination unit 760 calculates the weights for the output signals formed by the multi-beam forming units 721 to 72L as follows. First, singular value decomposition (H = UDV H ) of the transfer coefficient matrix H is performed, and a diagonal matrix D having diagonal elements of the unitary matrices U and V and the singular value √λ is calculated. The number of transmission antennas N, the number of receive antennas is M, the X and numbers smaller of M and N, u 1 ~u x a column vector of M × 1, v 1 ~v x columns of N × 1 Assuming that the vector and superscript H represent conjugate transpose, the transfer coefficient matrix is represented by the following equation (1).

Figure 0004435039
Figure 0004435039

式（１）において、伝達係数行列Ｈの要素Ｈｉｊは送信アンテナｊで送信され、受信アンテナｉで受信したときの伝達係数となっている。次に、特異値の大きい方からＬ個を選択し、各特異値に対応したユニタリ行列Ｖの列ベクトルｖ１〜ｖＬを重みとして選択し、Ｌ個の信号Ｔ１〜ＴＬから各列ベクトルを用いて次式（２）によって各アンテナ素子から送信する送信信号Ｓ１〜ＳＮを形成する。 In Expression (1), an element H ij of the transfer coefficient matrix H is a transfer coefficient when it is transmitted by the transmission antenna j and received by the reception antenna i. Next, L is selected from the larger singular values, column vectors v 1 to v L of the unitary matrix V corresponding to each singular value are selected as weights, and each column is selected from the L signals T 1 to T L. Transmission signals S 1 to S N transmitted from each antenna element are formed by the following equation (2) using a vector.

Figure 0004435039
Figure 0004435039

次に、受信局の受信装置では、例えば、送信局の空間多重伝送用送信装置から送信されたビームの数Ｌ以上の受信アンテナを用いて信号を受信して復号を行う。以下に、ビーム数をＬ（Ｌ≦Ｎ、Ｌ≦Ｍ）とした場合の受信装置における復号方法の例を示す。受信局のアンテナ素子において受信される信号をＲ１〜ＲＭとし、各受信信号における雑音をｎ１〜ｎＭとした場合、空間多重伝送用送信装置からの送信信号Ｓ１〜ＳＮを受信する受信装置における受信信号Ｒ１〜ＲＭは次式（３）によって表される。 Next, in the receiving apparatus of the receiving station, for example, signals are received and decoded using receiving antennas having a number L or more of beams transmitted from the transmitting apparatus for spatial multiplexing transmission of the transmitting station. An example of a decoding method in the receiving apparatus when the number of beams is L (L ≦ N, L ≦ M) is shown below. When the signals received by the antenna elements of the receiving station are R 1 to R M and the noise in each received signal is n 1 to n M , the transmission signals S 1 to S N from the spatial multiplexing transmission apparatus are received. Received signals R 1 to R M in the receiving device are expressed by the following equation (3).

Figure 0004435039
Figure 0004435039

したがって、受信装置では受信信号ベクトル（Ｒ１ Ｒ２ Ｒ３…ＲＬ）Ｔに対して次式（４）の演算を行うことで送信信号を復号することが可能となる。 Therefore, the reception apparatus can decode the transmission signal by performing the following equation (4) on the reception signal vector (R 1 R 2 R 3 ... R L ) T.

Figure 0004435039
Figure 0004435039

ここでＴ’１〜Ｔ’Ｌは、受信装置で推定した送信信号である。このようにすることによって、周波数帯域を増大せずにアンテナ数倍の伝送速度を実現することが可能となる。また、さらに、この構成により指向性利得が得られるだけでなく、さらにＮ素子から形成可能なＮ個のビームのうち特性の良好なＬ個のビームを選択するため(Ｎ≧Ｌ)、ダイバーシチ効果も得ることができる。
Miyashita, K.;Nishimura, T.;Ohgane, T.;Ogawa, Y;Taktori, Y.;Keizo Cho;”High data-rate transmission with eigenbeam-space division multiplexing(E-SDM) in a MIMO channel,”Vehicular Technology Conference, 2002. Proceedings. VTC 2002-Fall.2002 IEEE 56th, Volume:3, 24-28 Sept.2002 Pages:1302-1306 vol.3. Y. Takatori, et.al,”Miniaturization of base station antennas by using adaptive antenna technique for indoor high-speed wireless communication systems” Vehicular Technology Conference, 1998. VTC 98. 48th IEEE Volume 1, 18-21 May 1998 Page(s): 480-484 vol.1. Here, T ′ 1 to T ′ L are transmission signals estimated by the receiving apparatus. By doing so, it is possible to realize a transmission speed several times the number of antennas without increasing the frequency band. Furthermore, this configuration not only provides directivity gain, but also selects the L beams with good characteristics among the N beams that can be formed from the N elements (N ≧ L). Can also be obtained.
Miyashita, K.; Nishimura, T.; Ohgane, T.; Ogawa, Y; Taktori, Y.; Keizo Cho; ”High data-rate transmission with eigenbeam-space division multiplexing (E-SDM) in a MIMO channel,” Vehicular Technology Conference, 2002. Proceedings. VTC 2002-Fall. 2002 IEEE 56th, Volume: 3, 24-28 Sept. 2002 Pages: 1302-1306 vol. 3. Y. Takatori, et.al, “Miniaturization of base station antennas by using adaptive antenna technique for indoor high-speed wireless communication systems” Vehicular Technology Conference, 1998. VTC 98. 48th IEEE Volume 1, 18-21 May 1998 Page (s ): 480-484 vol.1.

ところで、上述した従来の単一搬送波を利用した無線システムにおける構成では、式（４）から分るように異なるＬ個の信号系列が１つのアンテナ素子で合成されるため、ベクトルｕ１〜ｕＬの値によって、大きな送信電力の変動が発生してしまうという問題がある。 By the way, in the configuration in the above-described conventional wireless system using a single carrier wave, since different L signal sequences are combined by one antenna element as can be seen from Equation (4), the vectors u 1 to u L There is a problem that a large fluctuation in transmission power occurs depending on the value of.

また、従来の構成を空間多重伝送における複数搬送波を利用した変調方式の無線通信システムに適用した場合、各搬送波の信号及び空間多重する信号のパターンによって、瞬時送信電力と平均送信電力の比が増大し、大きな送信電力の変動が発生するという問題がある。   Also, when the conventional configuration is applied to a radio communication system using a plurality of carriers in spatial multiplexing transmission, the ratio of instantaneous transmission power to average transmission power increases depending on the signal of each carrier and the pattern of signals to be spatially multiplexed. However, there is a problem that large transmission power fluctuations occur.

本発明は、上記問題を解決すべくなされたもので、その目的は、単一搬送波を利用した場合であっても送信電力の変動を低減し、さらに、複数搬送波を利用した空間多重伝送において、瞬時送信電力と平均送信電力の比を低減させて、送信電力の変動を低減することを可能とする空間多重伝送用送信装置及び空間多重伝送制御方法を提供することにある。   The present invention has been made to solve the above problems, and its purpose is to reduce fluctuations in transmission power even when a single carrier is used, and in spatial multiplexing transmission using multiple carriers, An object of the present invention is to provide a spatial multiplexing transmission device and a spatial multiplexing transmission control method capable of reducing fluctuations in transmission power by reducing the ratio of instantaneous transmission power and average transmission power.

上記問題を解決するために、本発明は、入力端子及び複数の出力端子を有し、前記入力端子から入力される入力信号を前記出力端子の数の信号に分配して前記複数の出力端子のそれぞれから出力する分配手段と、前記分配手段の複数の出力端子のそれぞれに対応付けて接続され、前記出力端子から出力される信号に対して、少なくとも１つが単一搬送波周波数変調方式に基づいて変調を行い、その他は、複数搬送波周波数変調方式に基づいて変調を行う複数の変調手段と、前記複数の変調手段のそれぞれに対応付けて接続され、前記変調手段から出力される信号に対して指向性の形成を行う複数の指向性形成手段と、送信アンテナを有し、前記複数の指向性形成手段のそれぞれに接続され、前記複数の指向性形成手段から出力される信号を合成し、合成した信号を前記送信アンテナから送信する複数の合成手段と、を備えたことを特徴とする空間多重伝送用送信装置である。   In order to solve the above problem, the present invention has an input terminal and a plurality of output terminals, and distributes an input signal input from the input terminal to signals of the number of the output terminals to The distribution means for outputting from each and the plurality of output terminals of the distribution means are connected in association with each other, and at least one of the signals output from the output terminals is modulated based on a single carrier frequency modulation system The others are connected to a plurality of modulation means for performing modulation based on a multi-carrier frequency modulation method, and are associated with each of the plurality of modulation means, and directivity to the signal output from the modulation means A plurality of directivity forming means for forming a signal and a transmission antenna, connected to each of the plurality of directivity forming means, and combining signals output from the plurality of directivity forming means. And a spatial multiplexing transmission transmitting device, wherein a synthesized signal and a plurality of combining means for transmitting from the transmitting antenna.

本発明は、入力端子及び複数の出力端子を有し、前記入力端子から入力される入力信号を前記出力端子の数の信号に分配して前記複数の出力端子のそれぞれから出力する分配手段と、前記分配手段の複数の出力端子のそれぞれに対応付けて接続され、前記出力端子から出力される信号に対して変調を行う複数の変調手段と、前記変調手段のそれぞれに対応付けて接続され、入力される信号の強度を変更して出力する複数の信号強度可変手段と、前記複数の信号強度可変手段のそれぞれに対応付けて接続され、前記信号強度可変手段から出力される信号に対して指向性の形成を行う複数の指向性形成手段と、送信アンテナを有し、前記複数の指向性形成手段のそれぞれに接続され、前記複数の指向性形成手段から出力される信号を合成し、合成した信号を前記送信アンテナから送信する複数の合成手段と、前記複数の指向性形成手段によって形成される指向性が適用される場合の受信側での伝送品質情報に基づいて、前記信号強度可変手段のそれぞれに信号強度変更指示を入力する伝送品質監視手段と、を備え、前記複数の信号強度可変手段は、前記伝送品質監視手段によって入力される信号強度変更指示に基づいて、入力される信号の強度を変更して出力し、前記複数の信号強度可変手段の中で、出力信号が最大の強度となる信号強度可変手段に対応する変調手段は、単一搬送波周波数変調方式に基づいて変調を行い、当該変調手段以外の変調手段は、複数搬送波周波数変調方式に基づいて変調を行うことを特徴とする空間多重伝送用送信装置である。   The present invention has an input terminal and a plurality of output terminals, distributing means for distributing the input signal input from the input terminal to the number of signals of the output terminal and outputting from each of the plurality of output terminals, A plurality of modulation means for modulating the signal output from the output terminal, connected in association with each of the plurality of output terminals of the distribution means, and connected in association with each of the modulation means; A plurality of signal intensity variable means for changing and outputting the intensity of the signal to be output, and a directivity with respect to the signal output from the signal intensity variable means connected to each of the plurality of signal intensity variable means A plurality of directivity forming means for forming and a transmission antenna, connected to each of the plurality of directivity forming means, and synthesizing and combining signals output from the plurality of directivity forming means The signal strength varying means based on transmission quality information on the receiving side when the directivity formed by the plurality of combining means for transmitting the received signal from the transmitting antenna and the directivity forming means is applied. Transmission quality monitoring means for inputting a signal strength change instruction to each of the plurality of signal strength variable means, wherein the plurality of signal strength variable means are configured to input signals based on the signal strength change instruction inputted by the transmission quality monitoring means. The modulation means corresponding to the signal intensity variable means that outputs the signal with a changed intensity and has the maximum output signal among the plurality of signal intensity variable means performs modulation based on the single carrier frequency modulation method. The modulation means other than the modulation means is a spatial multiplexing transmission apparatus characterized by performing modulation based on a multi-carrier frequency modulation system.

本発明は、上記に記載の発明において、送受信アンテナ間における伝達関数の推定を行う伝達関数推定手段と、前記伝達関数推定手段が推定した前記伝達関数に基づいて、前記複数の指向性形成手段が形成する指向性変更指示を入力する指向性制御手段と、を更に具備し、前記伝送品質監視手段は、前記伝達関数推定手段が推定した前記伝達関数及び所定の条件に基づいて信号強度変更指示を前記複数の信号強度可変手段に入力し、前記指向性形成手段は、前記指向性制御手段から入力される前記指向性変更指示に基づいて、前記信号強度可変手段から出力される信号に対して指向性の形成を行うことを特徴とする。   According to the present invention, in the above-described invention, a transfer function estimating unit that estimates a transfer function between transmitting and receiving antennas, and the plurality of directivity forming units are based on the transfer function estimated by the transfer function estimating unit. Directivity control means for inputting a directivity change instruction to be formed, wherein the transmission quality monitoring means outputs a signal strength change instruction based on the transfer function estimated by the transfer function estimation means and a predetermined condition. The directivity forming means is directed to a signal output from the signal intensity variable means based on the directivity change instruction input from the directivity control means. It is characterized by the formation of sex.

本発明は、上記に記載の発明において、前記伝送品質監視手段は、前記複数の変調手段に接続され、前記伝達関数推定手段が推定した前記伝達関数及び所定の条件に基づいて前記複数の変調手段のそれぞれによって行われる変調方式を変更することを特徴とする。   According to the present invention, in the above-described invention, the transmission quality monitoring unit is connected to the plurality of modulation units, and the plurality of modulation units is based on the transfer function estimated by the transfer function estimation unit and a predetermined condition. The modulation scheme performed by each of the above is changed.

本発明は、上記に記載の発明において、前記指向性制御手段が、前記単一搬送波周波数変調方式で変調される信号の指向性と、前記複数搬送波周波数変調方式で変調される信号の指向性とが直交するように指向性変更指示を前記複数の指向性形成手段に入力することを特徴とする。   The present invention provides the directivity of the signal modulated by the single carrier frequency modulation method and the directivity of the signal modulated by the multi-carrier frequency modulation method in the invention described above. The directivity change instruction is input to the plurality of directivity forming means so that the directions are orthogonal to each other.

本発明は、上記に記載の発明において、前記指向性制御手段が、前記複数搬送波周波数変調方式で変調される複数の信号の指向性がそれぞれ直交するように指向性変更指示を前記複数の指向性形成手段に入力することを特徴とする。   According to the present invention, in the above-described invention, the directivity control unit issues a directivity change instruction so that directivities of a plurality of signals modulated by the multi-carrier frequency modulation method are orthogonal to each other. Input to the forming means.

本発明は、上記に記載の発明において、前記分配手段の複数の出力端子と、前記出力端子に対応付けられる複数の変調手段との間をそれぞれ接続するように設けられ、更に前記伝送品質監視手段に接続され、前記伝送品質監視手段により所定の誤り率を満たすように設定される誤り符号化方式に基づいて前記分配手段の前記出力端子から入力される信号に対して誤り訂正符号化し、前記変調手段へ出力する複数の誤り訂正符号化手段を備えたことを特徴とする。   The present invention provides the transmission quality monitoring unit according to the invention described above, wherein the transmission quality monitoring unit is provided so as to connect the plurality of output terminals of the distribution unit and the plurality of modulation units associated with the output terminal. And an error correction code for a signal input from the output terminal of the distribution means based on an error coding method set to satisfy a predetermined error rate by the transmission quality monitoring means, and the modulation And a plurality of error correction coding means for outputting to the means.

本発明は、入力端子及び複数の出力端子を有する分配手段と、前記分配手段の複数の出力端子のそれぞれに対応付けて接続される複数の変調手段と、前記複数の変調手段のそれぞれに対応付けて接続される複数の指向性形成手段と、送信アンテナを有し、前記複数の指向性形成手段のそれぞれに接続される合成手段と、を備えた空間多重伝送用送信装置における空間多重伝送制御方法であって、前記分配手段が、前記入力端子から入力される入力信号を前記出力端子の数の信号に分配して前記複数の出力端子のそれぞれから出力するステップと、前記変調手段のうち少なくとも１つが単一搬送波周波数変調方式に基づいて前記出力端子から出力される信号に対して変調を行い、その他の変調手段は、複数搬送波変調方式に基づいて変調を行うステップと、前記指向性形成手段が、前記変調手段から出力される信号に対して指向性の形成を行うステップと、前記合成手段が、前記複数の指向性形成手段から出力される信号を合成し、合成した信号を前記送信アンテナから送信するステップと、を含むことを特徴とする空間多重伝送制御方法である。   The present invention relates to distribution means having an input terminal and a plurality of output terminals, a plurality of modulation means connected in association with each of the plurality of output terminals of the distribution means, and correspondence to each of the plurality of modulation means And a plurality of directivity forming means connected to each other, and a combining means having a transmission antenna and connected to each of the plurality of directivity forming means. The distribution means distributes the input signal input from the input terminal to the number of the output terminals and outputs the signal from each of the plurality of output terminals; and at least one of the modulation means One modulates the signal output from the output terminal based on a single carrier frequency modulation method, and the other modulation means modulates based on a multi-carrier modulation method A step in which the directivity forming means forms directivity with respect to the signal output from the modulating means; and the combining means combines the signals output from the plurality of directivity forming means. And a step of transmitting the synthesized signal from the transmitting antenna.

本発明は、入力端子及び複数の出力端子を有する分配手段と、前記分配手段の複数の出力端子のそれぞれに対応付けて接続される複数の変調手段と、前記変調手段のそれぞれに対応付けて接続される複数の信号強度可変手段と、前記複数の信号強度可変手段のそれぞれに対応付けて接続される複数の指向性形成手段と、送信アンテナを有し、前記複数の指向性形成手段のそれぞれに接続される複数の合成手段と、前記複数の信号強度可変手段に接続される伝送品質監視手段と、を備えた空間多重伝送用送信装置における空間多重伝送制御方法であって、前記分配手段が、前記入力端子から入力される入力信号を前記出力端子の数の信号に分配して前記複数の出力端子のそれぞれから出力するステップと、
前記伝送品質監視手段が、前記複数の指向性形成手段によって形成される指向性が適用される場合の受信側での伝送品質情報に基づいて、前記信号強度可変手段のそれぞれに信号強度変更指示を入力するステップと、前記変調手段のうち、前記複数の信号変調手段から出力される出力信号が最大の強度となる信号強度可変手段に対応する変調手段が、単一搬送波周波数変調方式に基づいて変調を行い、当該変調手段以外の変調手段が、複数搬送波周波数変調方式に基づいて変調を行うステップと、前記複数の信号強度可変手段が、前記伝送品質監視手段によって入力される信号強度変更指示に基づいて、入力される信号の強度を変更して出力するステップと、前記指向性形成手段が、前記信号強度可変手段から出力される信号に対して指向性の形成を行うステップと、前記合成手段が、記複数の指向性形成手段から出力される信号を合成し、合成した信号を前記送信アンテナから送信するステップと、を含むことを特徴とする空間多重伝送制御方法である。 The present invention provides a distribution means having an input terminal and a plurality of output terminals, a plurality of modulation means connected in association with each of the plurality of output terminals of the distribution means, and a connection in association with each of the modulation means A plurality of signal strength varying means, a plurality of directivity forming means connected in association with each of the plurality of signal strength variable means, and a transmission antenna, and each of the plurality of directivity forming means A spatial multiplexing transmission control method in a spatial multiplexing transmission apparatus comprising: a plurality of combining means connected; and a transmission quality monitoring means connected to the plurality of signal strength variable means, wherein the distributing means comprises: Distributing the input signal input from the input terminal to signals of the number of the output terminals and outputting from each of the plurality of output terminals;
The transmission quality monitoring means issues a signal strength change instruction to each of the signal strength variable means based on transmission quality information on the receiving side when the directivity formed by the plurality of directivity forming means is applied. And a modulation unit corresponding to the signal strength variable unit having the maximum output signal output from the plurality of signal modulation units among the modulation units is modulated based on a single carrier frequency modulation method. The modulation means other than the modulation means perform modulation based on the multi-carrier frequency modulation method, and the plurality of signal strength variable means based on the signal strength change instruction input by the transmission quality monitoring means. And changing the intensity of the input signal, and outputting the directivity with respect to the signal output from the signal intensity varying means. And a step of combining the signals output from the plurality of directivity forming means and transmitting the combined signal from the transmitting antenna. It is a control method.

本発明は、入力端子及び複数の出力端子を有する分配手段と、前記分配手段の複数の出力端子のそれぞれに対応付けて接続される複数の変調手段と、前記変調手段のそれぞれに対応付けて接続される複数の信号強度可変手段と、前記複数の信号強度可変手段のそれぞれに対応付けて接続される複数の指向性形成手段と、送信アンテナを有し、前記複数の指向性形成手段のそれぞれに接続される複数の合成手段と、前記複数の信号強度可変手段に接続される伝送品質監視手段と、前記複数の指向性形成手段に接続される指向性制御手段と、前記伝送品質監視手段及び前記指向性制御部に接続される伝達関数推定手段と、を備えた空間多重伝送用送信装置における空間多重伝送制御方法であって、前記伝達関数推定手段が、送受信アンテナ間における伝達関数の推定を行うステップと、前記伝送品質監視手段が、前記伝達関数推定手段が推定した前記伝達関数及び所定の条件に基づいて信号強度変更指示を前記複数の信号強度可変手段に入力するステップと、前記指向性制御手段が、前記伝達関数推定手段が推定した前記伝達関数に基づいて、前記複数の指向性形成手段が形成する指向性変更指示を入力するステップと、前記分配手段が、前記入力端子から入力される入力信号を前記出力端子の数の信号に分配して前記複数の出力端子のそれぞれから出力するステップと、前記変調手段のうち、前記複数の信号強度可変手段から出力される出力信号が最大の強度となる信号強度可変手段に対応する変調手段が、前記分配手段の出力端子から入力される信号に対して単一搬送波周波数変調方式に基づいて変調を行い、当該変調手段以外の変調手段が、前記分配手段の出力端子から入力される信号に対して複数搬送波周波数変調方式に基づいて変調を行うステップと、前記複数の信号強度可変手段が、前記伝送品質監視手段によって入力される信号強度変更指示に基づいて、入力される信号の強度を変更して出力するステップと、前記指向性形成手段が、前記信号強度可変手段から出力される信号に対して指向性の形成を行うステップと、前記合成手段が、記複数の指向性形成手段から出力される信号を合成し、合成した信号を前記送信アンテナから送信するステップと、を含むことを特徴とする空間多重伝送制御方法である。   The present invention provides a distribution means having an input terminal and a plurality of output terminals, a plurality of modulation means connected in association with each of the plurality of output terminals of the distribution means, and a connection in association with each of the modulation means A plurality of signal strength varying means, a plurality of directivity forming means connected in association with each of the plurality of signal strength variable means, and a transmission antenna, and each of the plurality of directivity forming means A plurality of connected combining means, a transmission quality monitoring means connected to the plurality of signal intensity varying means, a directivity control means connected to the plurality of directivity forming means, the transmission quality monitoring means, and the And a transfer function estimating means connected to the directivity control section, wherein the transfer function estimating means is provided between the transmitting and receiving antennas. The transmission function monitoring means inputs a signal strength change instruction to the plurality of signal strength varying means based on the transfer function estimated by the transfer function estimating means and a predetermined condition. A step of inputting a directivity change instruction formed by the plurality of directivity forming means based on the transfer function estimated by the transfer function estimating means; and the distributing means, Dividing the input signal input from the input terminal into signals of the number of the output terminals and outputting the signal from each of the plurality of output terminals; and outputting from the plurality of signal intensity variable means among the modulation means. The modulation means corresponding to the signal intensity variable means that gives the maximum output signal has a single carrier frequency modulation for the signal input from the output terminal of the distribution means. Modulation based on the equation, and a modulation means other than the modulation means modulates a signal input from an output terminal of the distribution means based on a multi-carrier frequency modulation method, and the plurality of signal intensities The variable means changes the intensity of the input signal based on the signal intensity change instruction input by the transmission quality monitoring means, and the directivity forming means outputs from the signal intensity variable means Forming directivity with respect to a signal to be transmitted; and combining the signals output from the plurality of directivity forming means and transmitting the combined signal from the transmitting antenna. It is a spatial multiplexing transmission control method characterized by including.

本発明は、入力端子及び複数の出力端子を有する分配手段と、前記分配手段の複数の出力端子のそれぞれに対応付けて接続される複数の誤り訂正符号化手段と、前記誤り訂正符号化手段のそれぞれに対応付けて接続される変調手段と、前記変調手段のそれぞれに対応付けて接続される複数の信号強度可変手段と、前記複数の信号強度可変手段のそれぞれに対応付けて接続される複数の指向性形成手段と、送信アンテナを有し、前記複数の指向性形成手段のそれぞれに接続される複数の合成手段と、前記複数の信号強度可変手段及び前記複数の誤り訂正手段に接続される伝送品質監視手段と、前記複数の指向性形成手段に接続される指向性制御手段と、前記伝送品質監視手段及び前記指向性制御部に接続される伝達関数推定手段と、を備えた空間多重伝送用送信装置における空間多重伝送制御方法であって、前記伝達関数推定手段が、送受信アンテナ間における伝達関数の推定を行うステップと、前記伝送品質監視手段が、前記伝達関数推定手段が推定した前記伝達関数及び所定の条件に基づいて信号強度変更指示を前記複数の信号強度可変手段に入力するステップと、前記伝送品質監視手段が、前記所定の誤り率を満たすように前記複数の誤り訂正符号化手段の誤り訂正符号化方式を設定するステップと、前記指向性制御手段が、前記伝達関数推定手段が推定した前記伝達関数に基づいて、前記複数の指向性形成手段が形成する指向性変更指示を入力するステップと、前記分配手段が、前記入力端子から入力される入力信号を前記出力端子の数の信号に分配して前記複数の出力端子のそれぞれから出力するステップと、前記誤り訂正符号化手段が、設定される誤り訂正符号化方式に基づいて、前記出力端子から出力される信号に誤り訂正を行うステップと、前記変調手段のうち、前記複数の信号強度可変手段から出力される出力信号が最大の強度となる信号強度可変手段に対応する変調手段が、前記誤り訂正符号化手段から入力される信号に対して単一搬送波周波数変調方式に基づいて変調を行い、当該変調手段以外の変調手段が、前記誤り訂正符号化手段から入力される信号に対して複数搬送波周波数変調方式に基づいて変調を行うステップと、前記複数の信号強度可変手段が、前記伝送品質監視手段によって入力される信号強度変更指示に基づいて、入力される信号の強度を変更して出力するステップと、前記指向性形成手段が、前記信号強度可変手段から出力される信号に対して指向性の形成を行うステップと、前記合成手段が、記複数の指向性形成手段から出力される信号を合成し、合成した信号を前記送信アンテナから送信するステップと、を含むことを特徴とする空間多重伝送制御方法である。   The present invention provides a distribution means having an input terminal and a plurality of output terminals, a plurality of error correction coding means connected in association with each of the plurality of output terminals of the distribution means, and the error correction coding means. Modulation means connected in association with each other, a plurality of signal intensity variable means connected in association with each of the modulation means, and a plurality of signals connected in association with each of the plurality of signal intensity variable means Transmission having a directivity forming means, a plurality of combining means connected to each of the plurality of directivity forming means, a plurality of signal intensity varying means, and a plurality of error correcting means. Quality monitoring means, directivity control means connected to the plurality of directivity forming means, and transfer function estimation means connected to the transmission quality monitoring means and the directivity control unit A spatial multiplexing transmission control method in a multiplex transmission apparatus, wherein the transfer function estimating means estimates a transfer function between transmitting and receiving antennas, and the transmission quality monitoring means is estimated by the transfer function estimating means A step of inputting a signal strength change instruction to the plurality of signal strength variable means based on the transfer function and a predetermined condition; and the transmission quality monitoring means includes the plurality of error correction codes so as to satisfy the predetermined error rate. A directivity change instruction formed by the plurality of directivity forming means based on the transfer function estimated by the transfer function estimating means; And the distributing means distributes an input signal input from the input terminal to signals of the number of the output terminals, and the plurality of output terminals. The step of outputting from each of the above, the step of performing error correction on the signal output from the output terminal based on the error correction encoding method set by the error correction encoding unit, The modulation means corresponding to the signal intensity variable means for which the output signal output from the plurality of signal intensity variable means has the maximum intensity is a single carrier frequency modulation method for the signal input from the error correction encoding means. Modulation based on a plurality of carrier frequency modulation schemes by the modulation means other than the modulation means based on the multiple carrier frequency modulation method, and the plurality of signal intensity variable means Changing the intensity of the input signal based on the signal intensity change instruction input by the transmission quality monitoring means, and outputting the directivity type And a step of forming directivity with respect to the signal output from the signal intensity varying unit, and a combining unit combining the signals output from the plurality of directivity forming units. Transmitting from the transmitting antenna. The spatial multiplexing transmission control method comprising:

この発明によれば、空間多重伝送用送信装置は、入力信号を分配する分配手段の複数の出力端子のそれぞれに対応付けて接続され、出力端子から出力される信号に対して、少なくとも１つが単一搬送波周波数変調方式に基づいて変調を行い、その他は、複数搬送波周波数変調方式に基づいて変調を行う複数の変調手段を備える構成とした。これにより、一部を単一搬送波変調方式で変調して指向性を形成する場合には、単一搬送波における送信電力の変動を低減することができるため、複数搬送波のみで送信した場合と比較して、規格化周波数に対する電力値の変化が平坦にすることができ、瞬時送信電力と平均送信電力の比の低減することができる。そのため、少なくとも１つが単一搬送波周波数変調方式で変調され、それ以外を複数搬送波周波数変調方式で変調することで、装置全体として瞬時送信電力と平均送信電力の比の低減させることができ、送信電力の変動を低減を図ることが可能となる。   According to the present invention, the spatial multiplexing transmission apparatus is connected in association with each of the plurality of output terminals of the distribution means for distributing the input signal, and at least one of the signals output from the output terminal is single. Modulation is performed based on a single carrier frequency modulation system, and the others are configured to include a plurality of modulation means for performing modulation based on a multi-carrier frequency modulation system. As a result, when directivity is formed by modulating a part with a single carrier modulation method, fluctuations in transmission power in a single carrier can be reduced, so compared with the case of transmission using only a plurality of carriers. Thus, the change in the power value with respect to the normalized frequency can be flattened, and the ratio between the instantaneous transmission power and the average transmission power can be reduced. Therefore, at least one is modulated by the single carrier frequency modulation method and the others are modulated by the multiple carrier frequency modulation method, so that the ratio of the instantaneous transmission power and the average transmission power can be reduced as a whole device. It is possible to reduce the fluctuation of the.

また、この発明によれば、空間多重伝送用送信装置は、複数の変調手段から入力される信号の強度を変更して出力する複数の信号強度可変手段と、複数の指向性形成手段によって形成される指向性が適用される場合の受信側での伝送品質情報に基づいて、信号強度可変手段のそれぞれに信号強度変更指示を入力する伝送品質監視手段と、を備え、複数の信号強度可変手段は、伝送品質監視手段によって入力される信号強度変更指示に基づいて、入力される信号の強度を変更して出力し、複数の信号強度可変手段の中で、出力信号が最大の強度となる信号強度可変手段に対応する変調手段は、単一搬送波周波数変調方式に基づいて変調を行い、当該変調手段以外の変調手段は、複数搬送波周波数変調方式に基づいて変調を行う構成とした。これにより、各変調手段からの出力される信号の強度を受信側での伝送品質に応じて変更することができ、送信電力が最も大きくなる変調手段において単一搬送波周波数変調方式を適用することで、更に、瞬時送信電力と平均送信電力の比の低減させることが可能となる。   Also, according to the present invention, the spatial multiplexing transmission apparatus is formed by a plurality of signal intensity variable means for changing the intensity of signals input from a plurality of modulation means and a plurality of directivity forming means. Transmission quality monitoring means for inputting a signal strength change instruction to each of the signal strength variable means based on transmission quality information on the receiving side when the directivity to be applied is applied, and the plurality of signal strength variable means includes Based on the signal strength change instruction input by the transmission quality monitoring means, the input signal strength is changed and output, and the signal strength at which the output signal has the maximum strength among the plurality of signal strength variable means The modulation means corresponding to the variable means performs modulation based on a single carrier frequency modulation system, and the modulation means other than the modulation means perform modulation based on a multi-carrier frequency modulation system. As a result, the intensity of the signal output from each modulation means can be changed according to the transmission quality on the receiving side, and the single carrier frequency modulation method is applied to the modulation means with the largest transmission power. Furthermore, it is possible to reduce the ratio of instantaneous transmission power and average transmission power.

また、この発明によれば、空間多重伝送用送信装置は、送受信アンテナ間における伝達関数の推定を行う伝達関数推定手段と、伝達関数推定手段が推定した伝達関数に基づいて、複数の指向性形成手段が形成する指向性変更指示を入力する指向性制御手段と、を更に具備し、伝送品質監視手段は、伝達関数推定手段が推定した前記伝達関数及び所定の条件に基づいて信号強度変更指示を前記複数の信号強度可変手段に入力し、指向性形成手段は、指向性制御手段から入力される指向性変更指示に基づいて、信号強度可変手段から出力される信号に対して指向性の形成を行う構成とした。これにより、送受信アンテナ間における伝達の特性を示す伝達関数に基づいて、各信号の指向性を形成することが可能となる。   Further, according to the present invention, the spatial multiplexing transmission apparatus includes a transfer function estimating unit that estimates a transfer function between transmitting and receiving antennas, and a plurality of directivity formations based on the transfer function estimated by the transfer function estimating unit. Directivity control means for inputting the directivity change instruction formed by the means, and the transmission quality monitoring means outputs the signal strength change instruction based on the transfer function estimated by the transfer function estimation means and a predetermined condition. The directivity forming means inputs the plurality of signal intensity variable means, and the directivity forming means forms directivity with respect to the signal output from the signal intensity variable means based on the directivity change instruction input from the directivity control means. The configuration is to be performed. Thereby, the directivity of each signal can be formed based on the transfer function indicating the transfer characteristic between the transmitting and receiving antennas.

また、この発明によれば、空間多重伝送用送信装置における伝送品質監視手段は、複数の変調手段に接続され、伝達関数推定手段が推定した伝達関数及び所定の条件に基づいて前記複数の変調手段のそれぞれによって行われる変調方式を変更する構成とした。これにより、伝達関数推定手段が推定した伝達関数及び所定の条件に基づいて、各変調手段における変調方式を変更することが可能となる。   According to the present invention, the transmission quality monitoring means in the spatial multiplexing transmission apparatus is connected to the plurality of modulation means, and the plurality of modulation means based on the transfer function estimated by the transfer function estimation means and the predetermined condition The modulation scheme performed by each of the above is changed. Thereby, it becomes possible to change the modulation system in each modulation means based on the transfer function estimated by the transfer function estimation means and the predetermined condition.

また、この発明によれば、空間多重伝送用送信装置における指向性制御手段が、単一搬送波周波数変調方式で変調される信号の指向性と、複数搬送波周波数変調方式で変調される信号の指向性とが直交するように指向性変更指示を前記複数の指向性形成手段に入力する構成とした。これにより、単一搬送波周波数変調方式と、複数搬送波変調方式との間における信号の干渉を防ぐことが可能となる。   Further, according to the present invention, the directivity control means in the spatial multiplexing transmission apparatus is configured such that the directivity of the signal modulated by the single carrier frequency modulation method and the directivity of the signal modulated by the multiple carrier frequency modulation method. The directivity change instruction is input to the plurality of directivity forming means so that the two are orthogonal to each other. As a result, it is possible to prevent signal interference between the single carrier frequency modulation scheme and the multiple carrier modulation scheme.

また、この発明によれば、空間多重伝送用送信装置における指向性制御手段が、複数搬送波周波数変調方式で変調される複数の信号の指向性がそれぞれ直交するように指向性変更指示を前記複数の指向性形成手段に入力する構成とした。これにより、複数搬送波変調方式のそれぞれの間における信号の干渉を防ぐことが可能となる。   Further, according to the present invention, the directivity control means in the spatial multiplexing transmission apparatus issues a directivity change instruction so that the directivities of a plurality of signals modulated by the multi-carrier frequency modulation method are orthogonal to each other. It was set as the structure input into a directivity formation means. As a result, it is possible to prevent signal interference between each of the multi-carrier modulation schemes.

また、この発明によれば、空間多重伝送用送信装置は、分配手段と、複数の変調手段との間をそれぞれ接続するように設けられ、更に伝送品質監視手段に接続され、伝送品質監視手段により所定の誤り率を満たすように設定される誤り符号化方式に基づいて分配手段から入力される信号に対して誤り訂正符号化し、変調手段へ出力する複数の誤り訂正符号化手段を備える構成とした。これにより、伝送品質監視手段が設定する誤り訂正符号化方式により適切な符号化が行われ、信頼性の向上を図ることが可能となる。   Further, according to the present invention, the spatial multiplexing transmission apparatus is provided so as to connect between the distributing means and the plurality of modulating means, and is further connected to the transmission quality monitoring means. Based on an error encoding scheme set to satisfy a predetermined error rate, a signal input from the distribution means is error correction encoded, and a plurality of error correction encoding means for output to the modulation means are provided. . As a result, appropriate encoding is performed by the error correction encoding method set by the transmission quality monitoring means, and reliability can be improved.

以下、本発明の第１から第４の実施形態を図面を参照して説明する。
（第１実施形態）
図１は、第１実施形態に係る空間多重伝送用送信装置１００ａを示す概略ブロック図である。空間多重伝送用送信装置１００ａにおいて、送信信号入力端子１０１は送信信号系列を入力する。分配部１０２は、送信信号入力端子１０１から入力される送信信号系列を分配する。変調部１０３１〜１０３Ｋは、分配部１０２が分配した送信信号に対して予め設定される変調方式に従って変調を行う。指向性形成部１０４１〜１０４Ｋは、変調部１０３１〜１０３Ｋにより変調された信号に対する指向性を形成、すなわち信号が指向性を有するように重み付けを行う。合成部１０５１〜１０５Ｎは、それぞれの指向性形成部１０４１〜１０４Ｋにより指向性が形成された信号を合成する。アンテナ素子１０６１〜１０６Ｎは、合成部１０５１〜１０５Ｎが合成する信号を送信する。 Hereinafter, first to fourth embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 is a schematic block diagram showing a spatial multiplexing transmission apparatus 100a according to the first embodiment. In the spatial multiplexing transmission apparatus 100a, the transmission signal input terminal 101 inputs a transmission signal sequence. Distribution section 102 distributes a transmission signal sequence input from transmission signal input terminal 101. Modulating sections 1031 to 103K modulate the transmission signal distributed by distributing section 102 according to a preset modulation scheme. The directivity forming units 1041 to 104K form directivity for the signals modulated by the modulation units 1031 to 103K, that is, weight the signals so that they have directivity. The synthesizers 1051 to 105N synthesize the signals having the directivity formed by the directivity forming units 1041 to 104K. The antenna elements 1061 to 106N transmit signals that are combined by the combining units 1051 to 105N.

以下、Ｋ＝２とし、変調部１０３１は単一搬送波変調が適用され、変調部１０３２は、複数搬送波変調が適用されているものとして第１実施形態に係る空間多重伝送用送信装置１００ａの動作について説明する。   Hereinafter, it is assumed that K = 2, the single-carrier modulation is applied to the modulation unit 1031, and the operation of the spatial multiplexing transmission apparatus 100 a according to the first embodiment is performed on the assumption that the modulation unit 1032 is applied with multi-carrier modulation. explain.

送信信号入力端子１０１から入力された送信信号系列は、分配部１０２により複数の信号系列に分配される。このとき、信号の分配は等分配にならなくてもよい。次に、変調部１０３１は、分配部１０２により分配される信号に対して予め設定される変調を行う。変調方式としては例えばＱＰＳＫ（Quadrature Phase Shift Keying）変調、１６ＱＡＭ（Quadrature Amplitude Modulation）変調などの変調方式を適用することが可能である。   The transmission signal sequence input from the transmission signal input terminal 101 is distributed to a plurality of signal sequences by the distribution unit 102. At this time, the signal distribution does not have to be equal. Next, the modulation unit 1031 performs preset modulation on the signal distributed by the distribution unit 102. As a modulation method, for example, a modulation method such as QPSK (Quadrature Phase Shift Keying) modulation or 16QAM (Quadrature Amplitude Modulation) modulation can be applied.

また、変調部１０３２は、ＱＰＳＫ（Quadrature Phase Shift Keying）変調、１６ＱＡＭ（Quadrature Amplitude Modulation）変調などの変調が適用された複数の信号系列を生成し、生成した各信号系列を異なる搬送波を用いて同時に出力する。このとき、各搬送波で異なる変調方式を適用することも可能である。   Also, the modulation unit 1032 generates a plurality of signal sequences to which modulation such as QPSK (Quadrature Phase Shift Keying) modulation or 16 QAM (Quadrature Amplitude Modulation) modulation is applied, and simultaneously generates the generated signal sequences using different carrier waves. Output. At this time, it is also possible to apply a different modulation method for each carrier wave.

次に、指向性形成部１０４１では、信号に対する指向性の形成が行われる。ここで、指向性の形成とは、例えば２つの送信アンテナによって同じ信号が送信される際に、一方の信号に対する重み付けの値と、他方の信号に対する重み付けの値とを変えることで、信号に指向性を持たせることをいう。単一搬送波に対して指向性の形成を適用した場合、非特許文献２に示されるように送受信間のマルチパス波のうち最大の遅延波の遅延時間がＬシンボル分であったときは、Ｎ＞Ｌ−１をみたすＮ個のアンテナ素子を用いることによって、遅延波の影響を除去することが可能となる。したがって、指向性形成部１０４１による指向性形成によって遅延波を抑圧するができ、指向性が形成された単一搬送波伝送が可能となる。   Next, the directivity forming unit 1041 forms directivity for the signal. Here, formation of directivity refers to directing a signal by changing the weighting value for one signal and the weighting value for the other signal when the same signal is transmitted by two transmitting antennas, for example. It means giving sex. When directivity formation is applied to a single carrier wave, as shown in Non-Patent Document 2, when the delay time of the maximum delay wave among multipath waves between transmission and reception is L symbols, N By using N antenna elements satisfying> L−1, it is possible to remove the influence of the delayed wave. Therefore, the delayed wave can be suppressed by the directivity formation by the directivity forming unit 1041, and single carrier wave transmission with directivity can be achieved.

図５は、単一搬送波で伝送した場合と複数搬送波で伝送した場合の周波数特性を示した図である。図５では、ライスフアクター６ｄＢ、遅延スプレッド１．２シンボル、到来波数１０００、到来波分布は指数分布、到来波の角度広がりは送受信とも３６０度、送信アンテナ素子数は８素子、受信アンテナ素子数は４素子、アンテナ素子配列は送受信とも直線配列、素子間隔は０．５λとして周波数特性を計測した。図５に示す通り、単一搬送波伝送における指向性形成部１０４１により形成される指向性が用いられる場合には、複数搬送波で送信した場合と比較して、規格化周波数に対する電力値の変化が平坦になるため、遅延波の影響を抑圧し、周波数選択性フェージングの影響を軽減できることが分かる。一方、複数搬送波で送信する指向性形成部１０４２により形成された指向性が適用された場合には、図５に示すように規格化周波数に対する電力値の変化が平坦にはならず、周波数選択性フェージングが残留する。   FIG. 5 is a diagram showing frequency characteristics when a single carrier wave is transmitted and when a plurality of carrier waves are transmitted. In FIG. 5, Rice factor 6 dB, delay spread 1.2 symbols, arrival wave number 1000, arrival wave distribution is exponential distribution, incoming wave angular spread is 360 degrees for both transmission and reception, transmission antenna element number is 8 elements, reception antenna element number Frequency characteristics were measured with 4 elements, antenna elements arranged linearly for both transmission and reception, and element spacing was 0.5λ. As shown in FIG. 5, when the directivity formed by the directivity forming unit 1041 in single carrier transmission is used, the change in the power value with respect to the normalized frequency is flat compared to the case where transmission is performed using a plurality of carriers. Therefore, it can be seen that the influence of the delay wave can be suppressed and the influence of the frequency selective fading can be reduced. On the other hand, when the directivity formed by the directivity forming unit 1042 that transmits by a plurality of carriers is applied, the change in the power value with respect to the normalized frequency is not flat as shown in FIG. Fading remains.

そのため、指向性形成部１０４１により指向性が形成され、単一搬送波を用いた変調方式が適用される伝送路では、周波数選択性フェージングの影響がないため、ＯＦＤＭ（Orthogonal Frequency Division Multiplexing）などの複数搬送波を用いる変調方式を適用する必要がない。これに対し、指向性形成部１０４２により指向性が形成され、複数搬送波を用いた変調方式が適用される伝送路では、周波数選択性フェージングの影響が強いため、ＯＦＤＭなどの複数搬送波に基づく変調方式を適用することによって、周波数選択性フェージングの影響を軽減する必要がある。   Therefore, directivity is formed by the directivity forming unit 1041 and there is no influence of frequency selective fading on a transmission line to which a modulation scheme using a single carrier is applied. Therefore, a plurality of OFDM (Orthogonal Frequency Division Multiplexing) and the like are used. There is no need to apply a modulation scheme using a carrier wave. On the other hand, in a transmission line in which directivity is formed by the directivity forming unit 1042 and a modulation method using a plurality of carriers is applied, the influence of frequency selective fading is strong, and thus a modulation method based on a plurality of carriers such as OFDM. It is necessary to reduce the influence of frequency selective fading.

図６は、本発明の第１実施形態に係る空間多重伝送用送信装置１００ａを用いた場合と、従来のＭＩＭＯ（Multiple Input Multiple Output）伝送方式を複数搬送波のシステムに適用した場合の、瞬時送信電力と平均送信電力の比の最大値を示した図である。図６に示す通り、サブキャリア数によらず、空間多重伝送用送信装置１００ａでは約６ｄＢの瞬時送信電力と平均送信電力の比の低減が可能となっていることが分かる。これは、全てを複数搬送波で伝送せず、一部を瞬時送信電力と平均送信電力の比が小さい単一搬送波で伝送させたためである。   FIG. 6 shows instantaneous transmissions when the spatial multiplexing transmission apparatus 100a according to the first embodiment of the present invention is used and when the conventional MIMO (Multiple Input Multiple Output) transmission method is applied to a system of multiple carriers. It is the figure which showed the maximum value of ratio of electric power and average transmission power. As shown in FIG. 6, it can be seen that the ratio of the instantaneous transmission power to the average transmission power of about 6 dB can be reduced in the spatial multiplexing transmission apparatus 100a regardless of the number of subcarriers. This is because not all of them are transmitted by a plurality of carriers, but a part is transmitted by a single carrier with a small ratio of instantaneous transmission power and average transmission power.

以上のように、第１実施形態に係る空間多重伝送用送信装置１００ａを用いることにより単一搬送波で送信しても周波数特性が平坦になることから、送信信号による送信電力の変動を低減することができる。また、複数搬送波の中で一部を単一搬送波で伝送させることにより、瞬時送信電力と平均送信電力の比を低減することができ、それにより、送信電力の変動を低減することができる。また、空間多重伝送用送信装置１００ａは、安価な送信増幅器を用いて構成することが可能であり、送信装置を構成するためのコストを低減することも可能である。   As described above, by using the spatial multiplexing transmission apparatus 100a according to the first embodiment, frequency characteristics are flattened even if transmission is performed with a single carrier wave, so that fluctuations in transmission power due to transmission signals are reduced. Can do. Further, by transmitting a part of a plurality of carrier waves with a single carrier wave, the ratio of the instantaneous transmission power and the average transmission power can be reduced, whereby the fluctuation of the transmission power can be reduced. The spatial multiplexing transmission apparatus 100a can be configured using an inexpensive transmission amplifier, and the cost for configuring the transmission apparatus can be reduced.

（第２実施形態）
図２は本発明の第２実施形態に係る空間多重伝送用送信装置１００ｂを示した概略ブロック図である。第２実施形態では、変調部１０３１〜１０３Ｋと指向性形成部１０４１〜１０４Ｋとの間に接続される信号強度可変部２０１１〜２０１Ｋと、信号強度可変部２０１１〜２０１Ｋのそれぞれに接続される伝送品質監視部２０２とを備えている点で第１実施形態の構成と異なる。 (Second Embodiment)
FIG. 2 is a schematic block diagram showing a spatial multiplexing transmission apparatus 100b according to the second embodiment of the present invention. In the second embodiment, the signal strength variable units 2011 to 201K connected between the modulation units 1031 to 103K and the directivity forming units 1041 to 104K, and the transmission quality connected to the signal strength variable units 2011 to 201K, respectively. It differs from the structure of 1st Embodiment by the point provided with the monitoring part 202. FIG.

以下に、第２実施形態において構成に加えられた信号強度可変部２０１１〜２０１Ｋ及び伝送品質監視部２０２に係る空間多重伝送用送信装置１００ｂの動作について説明する。
まず最初に、伝送品質監視部２０２は、たとえば受信局側の受信装置がＫ個の変調部１０３１〜１０３Ｋごとに推定した伝送品質情報、例えばＳＮＲ（Signal Noise Ratio）の情報を、受信装置からフィードバック回線を介して受信する。また、伝送品質監視部２０２は、受信装置から受信したＳＮＲと予め設定される目標ＳＮＲとの比較を行い、ＳＮＲが過剰、すなわち受信したＳＮＲが目標ＳＮＲを超えた変調部１０３１〜１０３Ｋに接続された信号強度可変部２０１１〜２０１Ｋについては出力電力を低減させるための信号強度変更指示を入力する。一方、受信したＳＮＲが目標ＳＮＲを下回った変調部１０３１〜１０３Ｋに接続された信号強度可変部２０１１〜２０１Ｋについては出力電力を増大させる信号強度変更指示を入力する。信号強度可変部２０１１〜２０１Ｋは、入力される信号強度変更指示に基づいて入力される信号の信号強度を低減あるいは増大し出力信号として出力する。 Hereinafter, the operation of the spatial multiplexing transmission apparatus 100b according to the signal strength variable units 2011 to 201K and the transmission quality monitoring unit 202 added to the configuration in the second embodiment will be described.
First, the transmission quality monitoring unit 202 feeds back, for example, transmission quality information estimated by the receiving device on the receiving station side for each of the K modulation units 1031 to 103K, for example, SNR (Signal Noise Ratio) information, from the receiving device. Receive via line. The transmission quality monitoring unit 202 compares the SNR received from the receiving apparatus with a preset target SNR, and is connected to the modulation units 1031 to 103K in which the SNR is excessive, that is, the received SNR exceeds the target SNR. The signal strength changing units 2011 to 201K receive a signal strength change instruction for reducing the output power. On the other hand, a signal strength change instruction for increasing output power is input to the signal strength varying units 2011 to 201K connected to the modulators 1031 to 103K whose received SNR is lower than the target SNR. The signal strength variable units 2011 to 201K reduce or increase the signal strength of the input signal based on the input signal strength change instruction and output it as an output signal.

以上のように、伝送品質監視部２０２が、信号強度可変部２０１１〜２０１Ｋからの出力電力を低減あるいは増大させることにより、送信電力が最も大きくなった変調部１０３１〜１０３Ｋの系統が、送信装置全体の特性に最も大きく与えることから、送信電力が最も大きくなった変調部１０３１〜１０３Ｋの系統で単一搬送波の変調方式を用いることによって、瞬時送信電力と平均送信電力の比が低減され、送信電力の変動を低減することができる。また、空間多重伝送用送信装置１００ｂは、安価な送信増幅器を用いて構成することが可能であり、送信装置を構成するためのコストを低減することも可能である。   As described above, the transmission quality monitoring unit 202 reduces or increases the output power from the signal strength variable units 2011 to 201K, so that the system of the modulation units 1031 to 103K whose transmission power is maximized is the entire transmission apparatus. The ratio of the instantaneous transmission power and the average transmission power is reduced by using a single carrier modulation scheme in the system of the modulation units 1031 to 103K having the largest transmission power. Fluctuations can be reduced. The spatial multiplexing transmission apparatus 100b can be configured using an inexpensive transmission amplifier, and the cost for configuring the transmission apparatus can be reduced.

なお、第２の実施形態に係る空間多重伝送用送信装置１００ｂにおいて、伝送品質監視部２０２と、各変調部１０３１〜１０３Ｋを接続し、ＳＮＲが良好な変調部１０３１〜１０３Ｋについては、伝送品質監視部２０２によって１シンボル当たりにより多くのデータを送信することができる他の変調方式を設定することも可能である。   Note that, in the spatial multiplexing transmission apparatus 100b according to the second embodiment, the transmission quality monitoring unit 202 is connected to each of the modulation units 1031 to 103K, and the modulation units 1031 to 103K having good SNR are monitored for transmission quality. It is also possible to set other modulation schemes by which the unit 202 can transmit more data per symbol.

（第３実施形態）
図３は、本発明の第３実施形態に係る空間多重伝送用送信装置１００ｃを示した概略ブロック図である。第３実施形態では、第２実施形態の構成に加えて、指向性形成部１０４１〜１０４Ｋと伝送品質監視部２０２とに接続される指向性制御部３０２と、指向性制御部３０２と伝送品質監視部２０２とに接続される伝達関数推定部３０１とを備えている点で異なる。 (Third embodiment)
FIG. 3 is a schematic block diagram showing a spatial multiplexing transmission apparatus 100c according to the third embodiment of the present invention. In the third embodiment, in addition to the configuration of the second embodiment, the directivity control unit 302 connected to the directivity forming units 1041 to 104K and the transmission quality monitoring unit 202, the directivity control unit 302, and the transmission quality monitoring The transfer function estimation unit 301 connected to the unit 202 is different.

以下に、第３実施形態において構成に加えられた伝達関数推定部３０１及び指向性制御部３０２に係る空間多重伝送用送信装置１００ｃの動作について説明する。
まず、伝達関数推定部３０１は、複数の搬送波のそれぞれについての送受信アンテナ間における伝達関数を推定、すなわち推定するための演算を行う。なお、伝達関数の推定は、伝達関数推定部３０１が推定を行わず、受信局側の受信装置で推定を行い、送信局側の空間多重伝送用送信装置１００ｃにフィードバックするようにしてもよい。 The operation of the spatial multiplexing transmission apparatus 100c related to the transfer function estimation unit 301 and the directivity control unit 302 added to the configuration in the third embodiment will be described below.
First, the transfer function estimation unit 301 estimates a transfer function between transmission and reception antennas for each of a plurality of carriers, that is, performs an operation for estimation. The transfer function may be estimated by the transfer function estimation unit 301 without performing the estimation, with the reception apparatus on the receiving station side performing the estimation and feeding back to the transmitting station side spatial multiplexing transmission apparatus 100c.

指向性制御部３０２は、伝達関数推定部３０１で推定した伝達関数に基づいて、例えばＭＭＳＥ（Minimum Mean Square Error）アルゴリズムによって、遅延波を抑圧する指向性を算出し、それぞれの指向性形成部１０４１〜１０４Ｋに算出した指向性を形成させるための指向性形成指示を入力する。   Based on the transfer function estimated by the transfer function estimation unit 301, the directivity control unit 302 calculates, for example, a directivity for suppressing a delayed wave by using an MMSE (Minimum Mean Square Error) algorithm, and each directivity forming unit 1041 A directivity formation instruction for forming the calculated directivity between ˜104K is input.

ここで、指向性制御部３０２による指向性の算出は以下のようにして行われる。まず、第１ステップでは、指向性制御部３０２が、単一の搬送波に適用される指向性を以下のように算出する。まず、周波数領域で得られている伝達関数にＩＦＦＴ(Inverse Fast Fourier Transform)を行い、時間応答関数を求める。このとき、非特許文献２に示されるように時間応答関数は、多重波の数に関係なく、シンボル間隔の時間応答の伝達関数で表すことができる。そして、指向性制御部３０２は、最も希望信号レベルが高くなる時間応答の伝達関数に係るタイミングを選択し、そのタイミング以外の伝達関数については除去する。これにより、反射波に基づく遅延信号を除去することが可能となる。除去した結果をもとに、指向性制御部３０２が、送受信間で最大比合成となるウェイトを算出する。   Here, the calculation of directivity by the directivity control unit 302 is performed as follows. First, in the first step, the directivity control unit 302 calculates the directivity applied to a single carrier wave as follows. First, IFFT (Inverse Fast Fourier Transform) is performed on the transfer function obtained in the frequency domain to obtain a time response function. At this time, as shown in Non-Patent Document 2, the time response function can be represented by a time response transfer function of a symbol interval regardless of the number of multiplexed waves. The directivity control unit 302 selects a timing related to the transfer function of the time response at which the desired signal level becomes the highest, and removes transfer functions other than the timing. Thereby, it becomes possible to remove the delay signal based on the reflected wave. Based on the result of the removal, the directivity control unit 302 calculates a weight that is a maximum ratio combination between transmission and reception.

次に、受信局側の受信装置の指向性パターンを得られた最大比合成パターンに固定し、そのときの送信局側の空間多重伝送用送信装置１００ｄの各アンテナとの伝達関数を再度算出し直す。算出し直された伝達関数をもとに、送信局側の空間多重伝送用送信装置１００ｃでの指向性を参照信号との２乗誤差が最小になるように算出する。これにより、単一搬送波を用いる変調信号に対する指向性を算出、すなわち指向性を形成することができる。   Next, the directivity pattern of the receiving apparatus on the receiving station side is fixed to the obtained maximum ratio combining pattern, and the transfer function with each antenna of the transmitting station 100d on the transmitting station side is calculated again. cure. Based on the recalculated transfer function, the directivity in the spatial multiplexing transmission apparatus 100c on the transmitting station side is calculated so that the square error with the reference signal is minimized. Thereby, the directivity with respect to the modulation signal using a single carrier wave can be calculated, that is, the directivity can be formed.

次に、第２ステップとして、指向性制御部３０２は、上記単一搬送波を用いる変調信号に対する指向性に対して、直交した指向性を算出する。ここで、本発明における「直交」とは、完全な直交関係でなく、ほぼ直交である関係であってもよい。一般にＮ素子のアンテナを用い、ある指向性パターンに直交する指向性を算出する場合、Ｎ−１個の指向性を算出することができる。そこで、このようにして算出されたＮ−１個の指向性パターンをＮ−１個のアンテナ素子と考え、非特許文献１に開示される従来のＭＩＭＯ伝送方式を各搬送波に適用する。以上のようにして指向性制御部３０２は、全ての指向性パターンを算出することができる。   Next, as a second step, the directivity control unit 302 calculates a directivity that is orthogonal to the directivity for the modulated signal using the single carrier wave. Here, “orthogonal” in the present invention is not a completely orthogonal relationship, but may be a substantially orthogonal relationship. In general, when an antenna having N elements is used and directivity orthogonal to a certain directivity pattern is calculated, N-1 directivities can be calculated. Therefore, the N-1 directivity patterns calculated in this way are considered as N-1 antenna elements, and the conventional MIMO transmission method disclosed in Non-Patent Document 1 is applied to each carrier wave. As described above, the directivity control unit 302 can calculate all directivity patterns.

伝送品質監視部２０２は、伝達関数推定部３０１が推定する伝達関数及び所定の条件に従って、出力信号を低減させるか増大させるかを判定し、出力電力を低減あるいは増大させるために信号強度変更指示をそれぞれの信号強度可変部２０１１〜２０１Ｋに入力する。
ここで、所定の条件とは、例えば、総送信電力を一定とする条件と、予め定められる所要伝送品質を満たすようにする条件のもと、瞬時最大電力と平均電力の比が所要値を満たすようにするという条件などである。 The transmission quality monitoring unit 202 determines whether to reduce or increase the output signal according to the transfer function estimated by the transfer function estimation unit 301 and a predetermined condition, and issues a signal strength change instruction to reduce or increase the output power. It inputs into each signal strength variable part 2011-201K.
Here, the predetermined condition is, for example, a condition that the total transmission power is constant and a condition that satisfies a predetermined required transmission quality, and a ratio between the instantaneous maximum power and the average power satisfies a required value. It is a condition of doing so.

以上のように、空間多重伝送用送信装置１００ｃを用いることによって、指向性制御部３０２によって無線信号を送信する環境に応じて適応的に指向性形成部１０４１〜１０４Ｋの指向性を変更することができる。   As described above, by using the spatial multiplexing transmission apparatus 100c, the directivity of the directivity forming units 1041 to 104K can be adaptively changed according to the environment in which the radio signal is transmitted by the directivity control unit 302. it can.

（第４実施形態）
図４は本発明の第４実施形態に係る空間多重伝送用送信装置１００ｄを示した概略ブロック図である。第４実施形態では、第３実施形態の構成に加えて、分配部１０２と変調部１０３１〜１０３Ｋとの間に誤り訂正符号化器４０１１〜４０１Ｋが備えられており、それぞれの誤り訂正符号化器４０１１〜４０１Ｋには、伝送品質監視部２０２に接続されている。 (Fourth embodiment)
FIG. 4 is a schematic block diagram showing a spatial multiplexing transmission apparatus 100d according to the fourth embodiment of the present invention. In the fourth embodiment, in addition to the configuration of the third embodiment, error correction encoders 4011 to 401K are provided between the distribution unit 102 and the modulation units 1031 to 103K, and each error correction encoder is provided. 4011 to 401K are connected to the transmission quality monitoring unit 202.

以下、第４実施形態に係る空間多重伝送用送信装置１００ｄの動作について説明する。
まず、伝達関数推定部３０１は、送受信アンテナ間の全ての搬送波における伝達関数が推定する。伝達関数推定部３０１によって推定された伝達関数は指向性制御部３０２に入力され、指向性が算出される。 The operation of the spatial multiplexing transmission apparatus 100d according to the fourth embodiment will be described below.
First, the transfer function estimation unit 301 estimates transfer functions in all carriers between transmission and reception antennas. The transfer function estimated by the transfer function estimation unit 301 is input to the directivity control unit 302, and the directivity is calculated.

次に、伝送品質監視部２０２は、各搬送波において算出した送信指向性で信号が送信された場合の受信電力を算出する。伝送品質監視部２０２は、算出された受信電力に基づき、例えば注水定理を適用するなどして、信号強度可変部２０１１〜２０１Ｋから出力される出力信号の電力を算出し、算出した電力に応じて信号強度可変部２０１１〜２０１Ｋに信号強度変更指示を入力する。また、伝送品質監視部２０２は、所定の誤り率をみたすように、誤り符号化器４０１１〜４０１Ｋにおける誤り訂正符号化方式の設定を行う。   Next, the transmission quality monitoring unit 202 calculates received power when a signal is transmitted with the transmission directivity calculated in each carrier wave. Based on the calculated received power, the transmission quality monitoring unit 202 calculates the power of the output signal output from the signal strength variable units 2011 to 201K, for example, by applying a water injection theorem, and according to the calculated power A signal strength change instruction is input to the signal strength variable units 2011 to 201K. Further, the transmission quality monitoring unit 202 sets an error correction coding method in the error encoders 4011 to 401K so as to satisfy a predetermined error rate.

以上のように、空間多重伝送用送信装置１００ｄを用いることによって、各変調方式、指向性パターン、送信電力、誤り訂正符号化に対して空間の状態に応じた適応的な変更が可能となる。   As described above, by using the spatial multiplexing transmission apparatus 100d, it is possible to adaptively change each modulation scheme, directivity pattern, transmission power, and error correction coding according to the state of the space.

なお、第３及び第４実施形態において、指向性制御部３０２と伝送品質監視部２０２を接続し、指向性制御部３０２が算出した指向性を伝送品質監視部２０２に入力し、伝送品質監視部２０２が、入力される指向性とともに伝達関数及び所定の条件に基づいて、信号強度可変部２０１の出力電力を低減あるいは増大させるか否かを判定させるようにしてもよい。   In the third and fourth embodiments, the directivity control unit 302 and the transmission quality monitoring unit 202 are connected, and the directivity calculated by the directivity control unit 302 is input to the transmission quality monitoring unit 202 to transmit the transmission quality monitoring unit. 202 may determine whether to reduce or increase the output power of the signal strength varying unit 201 based on the input directivity and the transfer function and a predetermined condition.

また、第２、第３、第４実施形態において、伝送品質監視部２０２と各変調部１０３１〜１０３Ｋとを接続し、伝送品質監視部２０２が、各変調部１０３１〜１０３ＩＫを伝搬路に応じて変調部に単一周波数を用いた変調方式を設定するようにしてもよい。ここで、伝送路に応じた設定とは、例えば、上述した信号強度可変部２０１１〜２０１Ｋの中で最大強度の出力信号を出力させるようにした信号強度可変部に対応する変調部に対して単一周波数を用いた変調方式を適用し、また、ＳＮＲが良好な変調部に対しては、１シンボル当たりより多くのデータを送信できるようにする変調方式を適用することなどである。   In the second, third, and fourth embodiments, the transmission quality monitoring unit 202 is connected to each of the modulation units 1031 to 103K, and the transmission quality monitoring unit 202 connects each of the modulation units 1031 to 103IK according to the propagation path. A modulation method using a single frequency may be set in the modulation unit. Here, the setting according to the transmission path is, for example, for the modulation unit corresponding to the signal strength variable unit that outputs the output signal having the maximum strength among the signal strength variable units 2011 to 201K described above. For example, a modulation scheme that uses one frequency is applied, and a modulation scheme that allows more data to be transmitted per symbol is applied to a modulation unit having a good SNR.

また、第１実施形態から第３実施形態おいて、第４実施形態に係る誤り符号化器４０１１〜４０１Ｋを、分配部１０２と、変調部１０３１〜１０３Ｋの間に備えるようにしてもよく、これにより、第１から第３実施形態においても誤り訂正符号化による信頼性の向上を図ることが可能となる。   In the first to third embodiments, the error encoders 4011 to 401K according to the fourth embodiment may be provided between the distribution unit 102 and the modulation units 1031 to 103K. Therefore, it is possible to improve the reliability by error correction coding also in the first to third embodiments.

また、本発明に係る分配手段、変調手段、指向性形成手段、合成手段、信号強度可変手段、伝送品質監視手段、伝達関数推定手段、指向性制御手段、誤り訂正符号化手段は、それぞれ、上記の実施形態に係る分配部１０２、変調部１０３１〜１０３Ｋ、指向性形成部１０４１〜１０４Ｋ、合成部１０５１〜１０５Ｎ、信号強度可変部２０１１〜２０１Ｋ、伝送品質監視部２０２、伝達関数推定部３０１、指向性制御部３０２、誤り訂正符号化器４０１１〜４０１Ｋに対応する。   Also, the distribution means, modulation means, directivity forming means, combining means, signal strength variable means, transmission quality monitoring means, transfer function estimating means, directivity control means, and error correction coding means according to the present invention are respectively described above. Distribution unit 102, modulation units 1031 to 103K, directivity forming units 1041 to 104K, synthesis units 1051 to 105N, signal strength variable units 2011 to 201K, transmission quality monitoring unit 202, transfer function estimation unit 301, directivity Corresponds to the error control unit 302 and the error correction encoders 4011 to 401K.

第１実施形態に係る空間多重伝送用送信装置を示すブロック図である。1 is a block diagram illustrating a spatial multiplexing transmission apparatus according to a first embodiment. FIG. 第２実施形態に係る空間多重伝送用送信装置を示すブロック図である。It is a block diagram which shows the transmitter for spatial multiplexing transmission which concerns on 2nd Embodiment. 第３実施形態に係る空間多重伝送用送信装置を示すブロック図である。It is a block diagram which shows the transmitter for spatial multiplexing transmission which concerns on 3rd Embodiment. 第４実施形態に係る空間多重伝送用送信装置を示すブロック図である。It is a block diagram which shows the transmitter for spatial multiplexing transmission which concerns on 4th Embodiment. 第１実施形態に係る空間多重伝送用送信装置の周波数特性を示した図である。It is the figure which showed the frequency characteristic of the transmitter for spatial multiplexing transmission which concerns on 1st Embodiment. 第１実施形態に係る空間多重伝送用送信装置と従来の装置における瞬時送信電力と平均送信電力の比の最大値の変化を示した図である。It is the figure which showed the change of the maximum value of ratio of the instantaneous transmission power and average transmission power in the transmission apparatus for spatial multiplexing which concerns on 1st Embodiment, and the conventional apparatus. 従来技術における空間多重伝送用送信装置を示すブロック図である。It is a block diagram which shows the transmitter for spatial multiplexing transmission in a prior art.

符号の説明Explanation of symbols

１０１ 入力端子
１０２ 分配部
１０３１〜１０３Ｋ 変調部
１０４１〜１０４Ｋ 指向性形成部
１０５１〜１０５Ｎ 合成部
１０６１〜１６０Ｎ 送信アンテナ素子
１００ａ 空間多重伝送用送信装置

DESCRIPTION OF SYMBOLS 101 Input terminal 102 Distribution part 1031-103K Modulation part 1041-104K Directivity formation part 1051-105N Synthesis | combination part 1061-160N Transmission antenna element 100a Transmitter for spatial multiplexing transmission

Claims (11)

入力端子及び複数の出力端子を有し、前記入力端子から入力される入力信号を前記出力端子の数の信号に分配して前記複数の出力端子のそれぞれから出力する分配手段と、
前記分配手段の複数の出力端子のそれぞれに対応付けて接続され、前記出力端子から出力される信号に対して、少なくとも１つが単一搬送波周波数変調方式に基づいて変調を行い、その他は、複数搬送波周波数変調方式に基づいて変調を行う複数の変調手段と、
前記複数の変調手段のそれぞれに対応付けて接続され、前記変調手段から出力される信号に対して指向性の形成を行う複数の指向性形成手段と、
送信アンテナを有し、前記複数の指向性形成手段のそれぞれに接続され、前記複数の指向性形成手段から出力される信号を合成し、合成した信号を前記送信アンテナから送信する複数の合成手段と、
を備えたことを特徴とする空間多重伝送用送信装置。 Distributing means that has an input terminal and a plurality of output terminals, distributes an input signal input from the input terminal to signals of the number of the output terminals, and outputs from each of the plurality of output terminals;
Each of the plurality of output terminals of the distribution means is connected in association with each other, and at least one of the signals output from the output terminal modulates based on a single carrier frequency modulation method, and the others are a plurality of carrier waves A plurality of modulation means for performing modulation based on the frequency modulation method;
A plurality of directivity forming means connected in association with each of the plurality of modulation means, and forming directivity with respect to a signal output from the modulation means;
A plurality of combining means each having a transmission antenna, connected to each of the plurality of directivity forming means, combining signals output from the plurality of directivity forming means, and transmitting the combined signal from the transmission antenna; ,
A spatial multiplexing transmission apparatus characterized by comprising: 入力端子及び複数の出力端子を有し、前記入力端子から入力される入力信号を前記出力端子の数の信号に分配して前記複数の出力端子のそれぞれから出力する分配手段と、
前記分配手段の複数の出力端子のそれぞれに対応付けて接続され、前記出力端子から出力される信号に対して変調を行う複数の変調手段と、
前記変調手段のそれぞれに対応付けて接続され、入力される信号の強度を変更して出力する複数の信号強度可変手段と、
前記複数の信号強度可変手段のそれぞれに対応付けて接続され、前記信号強度可変手段から出力される信号に対して指向性の形成を行う複数の指向性形成手段と、
送信アンテナを有し、前記複数の指向性形成手段のそれぞれに接続され、前記複数の指向性形成手段から出力される信号を合成し、合成した信号を前記送信アンテナから送信する複数の合成手段と、
前記複数の指向性形成手段によって形成される指向性が適用される場合の受信側での伝送品質情報に基づいて、前記信号強度可変手段のそれぞれに信号強度変更指示を入力する伝送品質監視手段と、を備え、
前記複数の信号強度可変手段は、
前記伝送品質監視手段によって入力される信号強度変更指示に基づいて、入力される信号の強度を変更して出力し、
前記複数の信号強度可変手段の中で、出力信号が最大の強度となる信号強度可変手段に対応する変調手段は、
単一搬送波周波数変調方式に基づいて変調を行い、当該変調手段以外の変調手段は、複数搬送波周波数変調方式に基づいて変調を行う
ことを特徴とする空間多重伝送用送信装置。 Distributing means that has an input terminal and a plurality of output terminals, distributes an input signal input from the input terminal to signals of the number of the output terminals, and outputs from each of the plurality of output terminals;
A plurality of modulation means connected to each of the plurality of output terminals of the distribution means and modulating the signal output from the output terminal;
A plurality of signal intensity variable means connected in association with each of the modulation means and changing and outputting the intensity of the input signal;
A plurality of directivity forming means connected to each of the plurality of signal intensity variable means and forming directivity with respect to a signal output from the signal intensity variable means;
A plurality of combining means each having a transmission antenna, connected to each of the plurality of directivity forming means, combining signals output from the plurality of directivity forming means, and transmitting the combined signal from the transmission antenna; ,
Transmission quality monitoring means for inputting a signal strength change instruction to each of the signal strength variable means based on transmission quality information on the receiving side when the directivity formed by the plurality of directivity forming means is applied; With
The plurality of signal intensity variable means include
Based on the signal strength change instruction input by the transmission quality monitoring means, the input signal strength is changed and output,
Among the plurality of signal intensity variable means, the modulation means corresponding to the signal intensity variable means with which the output signal has the maximum intensity,
A transmitter for spatial multiplexing transmission, wherein modulation is performed based on a single carrier frequency modulation scheme, and modulation means other than the modulation means perform modulation based on a multiple carrier frequency modulation scheme. 送受信アンテナ間における伝達関数の推定を行う伝達関数推定手段と、
前記伝達関数推定手段が推定した前記伝達関数に基づいて、前記複数の指向性形成手段が形成する指向性変更指示を入力する指向性制御手段と、を更に具備し、
前記伝送品質監視手段は、
前記伝達関数推定手段が推定した前記伝達関数及び所定の条件に基づいて信号強度変更指示を前記複数の信号強度可変手段に入力し、
前記指向性形成手段は、前記指向性制御手段から入力される前記指向性変更指示に基づいて、前記信号強度可変手段から出力される信号に対して指向性の形成を行う
ことを特徴とする請求項２に記載の空間多重伝送用送信装置。 Transfer function estimating means for estimating a transfer function between the transmitting and receiving antennas;
Directivity control means for inputting directivity change instructions formed by the plurality of directivity forming means based on the transfer function estimated by the transfer function estimating means,
The transmission quality monitoring means includes
Based on the transfer function estimated by the transfer function estimation means and a predetermined condition, a signal strength change instruction is input to the plurality of signal strength variable means,
The directivity forming means forms directivity with respect to a signal output from the signal strength varying means based on the directivity change instruction input from the directivity control means. Item 3. The spatial multiplexing transmission apparatus according to Item 2. 前記伝送品質監視手段は、
前記複数の変調手段に接続され、前記伝達関数推定手段が推定した前記伝達関数及び所定の条件に基づいて前記複数の変調手段のそれぞれによって行われる変調方式を変更する
ことを特徴とする請求項２または３に記載の空間多重伝送用送信装置。 The transmission quality monitoring means includes
3. The modulation system connected to the plurality of modulation units and changed by each of the plurality of modulation units based on the transfer function estimated by the transfer function estimation unit and a predetermined condition is changed. Or the spatial multiplexing transmission apparatus according to 3; 前記指向性制御手段が、前記単一搬送波周波数変調方式で変調される信号の指向性と、前記複数搬送波周波数変調方式で変調される信号の指向性とが直交するように指向性変更指示を前記複数の指向性形成手段に入力する
ことを特徴とする請求項３または４に記載の空間多重伝送用送信装置。 The directivity control means issues a directivity change instruction so that the directivity of a signal modulated by the single carrier frequency modulation method and the directivity of a signal modulated by the multiple carrier frequency modulation method are orthogonal to each other. The transmitter for spatial multiplexing transmission according to claim 3 or 4, wherein the transmitter is input to a plurality of directivity forming means. 前記指向性制御手段が、前記複数搬送波周波数変調方式で変調される複数の信号の指向性がそれぞれ直交するように指向性変更指示を前記複数の指向性形成手段に入力する
ことを特徴とする請求項５に記載の空間多重伝送用送信装置。 The directivity control unit inputs a directivity change instruction to the plurality of directivity forming units so that directivities of a plurality of signals modulated by the multi-carrier frequency modulation method are orthogonal to each other. Item 6. The spatial multiplexing transmission apparatus according to Item 5. 前記分配手段の複数の出力端子と、前記出力端子に対応付けられる複数の変調手段との間をそれぞれ接続するように設けられ、更に前記伝送品質監視手段に接続され、前記伝送品質監視手段により所定の誤り率を満たすように設定される誤り符号化方式に基づいて前記分配手段の前記出力端子から入力される信号に対して誤り訂正符号化し、前記変調手段へ出力する複数の誤り訂正符号化手段
を備えたことを特徴とする請求項２から６のいずれか１つに記載の空間多重伝送用送信装置。 A plurality of output terminals of the distribution means and a plurality of modulation means associated with the output terminals are connected to each other, and further connected to the transmission quality monitoring means. A plurality of error correction coding means for performing error correction coding on a signal input from the output terminal of the distribution means based on an error coding method set so as to satisfy an error rate of the distribution means, and outputting to the modulation means The transmitter for spatial multiplexing transmission according to any one of claims 2 to 6, further comprising: 入力端子及び複数の出力端子を有する分配手段と、前記分配手段の複数の出力端子のそれぞれに対応付けて接続される複数の変調手段と、前記複数の変調手段のそれぞれに対応付けて接続される複数の指向性形成手段と、送信アンテナを有し、前記複数の指向性形成手段のそれぞれに接続される合成手段と、を備えた空間多重伝送用送信装置における空間多重伝送制御方法であって、
前記分配手段が、前記入力端子から入力される入力信号を前記出力端子の数の信号に分配して前記複数の出力端子のそれぞれから出力するステップと、
前記変調手段のうち少なくとも１つが単一搬送波周波数変調方式に基づいて前記出力端子から出力される信号に対して変調を行い、その他の変調手段は、複数搬送波変調方式に基づいて変調を行うステップと、
前記指向性形成手段が、前記変調手段から出力される信号に対して指向性の形成を行うステップと、
前記合成手段が、前記複数の指向性形成手段から出力される信号を合成し、合成した信号を前記送信アンテナから送信するステップと、
を含むことを特徴とする空間多重伝送制御方法。 Distributing means having an input terminal and a plurality of output terminals, a plurality of modulating means connected in association with each of the plurality of output terminals of the distributing means, and connected in association with each of the plurality of modulating means A spatial multiplexing transmission control method in a spatial multiplexing transmission apparatus comprising a plurality of directivity forming means and a combining means having a transmission antenna and connected to each of the plurality of directivity forming means,
The distributing means distributing the input signal input from the input terminal to the number of signals of the output terminals and outputting from each of the plurality of output terminals;
At least one of the modulation means modulates a signal output from the output terminal based on a single carrier frequency modulation method, and the other modulation means modulates based on a multi-carrier modulation method; ,
The directivity forming means forms directivity with respect to a signal output from the modulating means;
The combining unit combines the signals output from the plurality of directivity forming units, and transmits the combined signal from the transmission antenna;
A spatial multiplexing transmission control method comprising: 入力端子及び複数の出力端子を有する分配手段と、前記分配手段の複数の出力端子のそれぞれに対応付けて接続される複数の変調手段と、前記変調手段のそれぞれに対応付けて接続される複数の信号強度可変手段と、前記複数の信号強度可変手段のそれぞれに対応付けて接続される複数の指向性形成手段と、送信アンテナを有し、前記複数の指向性形成手段のそれぞれに接続される複数の合成手段と、前記複数の信号強度可変手段に接続される伝送品質監視手段と、を備えた空間多重伝送用送信装置における空間多重伝送制御方法であって、
前記分配手段が、前記入力端子から入力される入力信号を前記出力端子の数の信号に分配して前記複数の出力端子のそれぞれから出力するステップと、
前記伝送品質監視手段が、前記複数の指向性形成手段によって形成される指向性が適用される場合の受信側での伝送品質情報に基づいて、前記信号強度可変手段のそれぞれに信号強度変更指示を入力するステップと、
前記変調手段のうち、前記複数の信号変調手段から出力される出力信号が最大の強度となる信号強度可変手段に対応する変調手段が、単一搬送波周波数変調方式に基づいて変調を行い、当該変調手段以外の変調手段が、複数搬送波周波数変調方式に基づいて変調を行うステップと、
前記複数の信号強度可変手段が、前記伝送品質監視手段によって入力される信号強度変更指示に基づいて、入力される信号の強度を変更して出力するステップと、
前記指向性形成手段が、前記信号強度可変手段から出力される信号に対して指向性の形成を行うステップと、
前記合成手段が、記複数の指向性形成手段から出力される信号を合成し、合成した信号を前記送信アンテナから送信するステップと、
を含むことを特徴とする空間多重伝送制御方法。 Distributing means having an input terminal and a plurality of output terminals, a plurality of modulation means connected in association with each of the plurality of output terminals of the distribution means, and a plurality of connections connected in association with each of the modulation means A signal intensity varying unit; a plurality of directivity forming units connected in association with each of the plurality of signal intensity varying units; and a plurality of transmitting antennas connected to each of the plurality of directivity forming units. A spatial multiplexing transmission control method in a spatial multiplexing transmission apparatus comprising: a combining means; and a transmission quality monitoring means connected to the plurality of signal intensity varying means,
The distributing means distributing the input signal input from the input terminal to the number of signals of the output terminals and outputting from each of the plurality of output terminals;
The transmission quality monitoring means issues a signal strength change instruction to each of the signal strength variable means based on transmission quality information on the receiving side when the directivity formed by the plurality of directivity forming means is applied. Step to enter,
Among the modulating means, the modulating means corresponding to the signal intensity varying means that outputs signals output from the plurality of signal modulating means have the maximum intensity performs modulation based on the single carrier frequency modulation method, and the modulation Modulation means other than the means for performing modulation based on a multi-carrier frequency modulation scheme;
The plurality of signal strength varying means changing and outputting the strength of the input signal based on a signal strength change instruction input by the transmission quality monitoring means;
The directivity forming means performs directivity formation on the signal output from the signal intensity varying means;
The combining means combines the signals output from the plurality of directivity forming means, and transmits the combined signal from the transmission antenna;
A spatial multiplexing transmission control method comprising: 入力端子及び複数の出力端子を有する分配手段と、前記分配手段の複数の出力端子のそれぞれに対応付けて接続される複数の変調手段と、前記変調手段のそれぞれに対応付けて接続される複数の信号強度可変手段と、前記複数の信号強度可変手段のそれぞれに対応付けて接続される複数の指向性形成手段と、送信アンテナを有し、前記複数の指向性形成手段のそれぞれに接続される複数の合成手段と、前記複数の信号強度可変手段に接続される伝送品質監視手段と、前記複数の指向性形成手段に接続される指向性制御手段と、前記伝送品質監視手段及び前記指向性制御部に接続される伝達関数推定手段と、を備えた空間多重伝送用送信装置における空間多重伝送制御方法であって、
前記伝達関数推定手段が、送受信アンテナ間における伝達関数の推定を行うステップと、
前記伝送品質監視手段が、前記伝達関数推定手段が推定した前記伝達関数及び所定の条件に基づいて信号強度変更指示を前記複数の信号強度可変手段に入力するステップと、
前記指向性制御手段が、前記伝達関数推定手段が推定した前記伝達関数に基づいて、前記複数の指向性形成手段が形成する指向性変更指示を入力するステップと、
前記分配手段が、前記入力端子から入力される入力信号を前記出力端子の数の信号に分配して前記複数の出力端子のそれぞれから出力するステップと、
前記変調手段のうち、前記複数の信号強度可変手段から出力される出力信号が最大の強度となる信号強度可変手段に対応する変調手段が、前記分配手段の出力端子から入力される信号に対して単一搬送波周波数変調方式に基づいて変調を行い、当該変調手段以外の変調手段が、前記分配手段の出力端子から入力される信号に対して複数搬送波周波数変調方式に基づいて変調を行うステップと、
前記複数の信号強度可変手段が、前記伝送品質監視手段によって入力される信号強度変更指示に基づいて、入力される信号の強度を変更して出力するステップと、
前記指向性形成手段が、前記信号強度可変手段から出力される信号に対して指向性の形成を行うステップと、
前記合成手段が、記複数の指向性形成手段から出力される信号を合成し、合成した信号を前記送信アンテナから送信するステップと、
を含むことを特徴とする空間多重伝送制御方法。 Distributing means having an input terminal and a plurality of output terminals, a plurality of modulation means connected in association with each of the plurality of output terminals of the distribution means, and a plurality of connections connected in association with each of the modulation means A signal intensity varying unit; a plurality of directivity forming units connected in association with each of the plurality of signal intensity varying units; and a plurality of transmitting antennas connected to each of the plurality of directivity forming units. Combining means, transmission quality monitoring means connected to the plurality of signal intensity varying means, directivity control means connected to the plurality of directivity forming means, the transmission quality monitoring means and the directivity control unit A transfer function estimation means connected to the spatial multiplexing transmission control method in a spatial multiplexing transmission apparatus comprising:
The transfer function estimating means estimating a transfer function between the transmitting and receiving antennas;
The transmission quality monitoring means inputting a signal strength change instruction to the plurality of signal strength variable means based on the transfer function estimated by the transfer function estimation means and a predetermined condition;
The directivity control means inputs a directivity change instruction formed by the plurality of directivity formation means based on the transfer function estimated by the transfer function estimation means;
The distributing means distributing the input signal input from the input terminal to the number of signals of the output terminals and outputting from each of the plurality of output terminals;
Among the modulating means, the modulating means corresponding to the signal intensity varying means that has the maximum output signal output from the plurality of signal intensity varying means is provided for the signal input from the output terminal of the distributing means. Performing modulation based on a single carrier frequency modulation scheme, and modulating means other than the modulation means performing modulation on a signal input from the output terminal of the distribution means based on a multiple carrier frequency modulation scheme;
The plurality of signal strength variable means changing and outputting the strength of the input signal based on a signal strength change instruction input by the transmission quality monitoring means; and
The directivity forming means performs directivity formation on the signal output from the signal intensity varying means;
The combining means combines the signals output from the plurality of directivity forming means, and transmits the combined signal from the transmission antenna;
A spatial multiplexing transmission control method comprising: 入力端子及び複数の出力端子を有する分配手段と、前記分配手段の複数の出力端子のそれぞれに対応付けて接続される複数の誤り訂正符号化手段と、前記誤り訂正符号化手段のそれぞれに対応付けて接続される変調手段と、前記変調手段のそれぞれに対応付けて接続される複数の信号強度可変手段と、前記複数の信号強度可変手段のそれぞれに対応付けて接続される複数の指向性形成手段と、送信アンテナを有し、前記複数の指向性形成手段のそれぞれに接続される複数の合成手段と、前記複数の信号強度可変手段及び前記複数の誤り訂正手段に接続される伝送品質監視手段と、前記複数の指向性形成手段に接続される指向性制御手段と、前記伝送品質監視手段及び前記指向性制御部に接続される伝達関数推定手段と、を備えた空間多重伝送用送信装置における空間多重伝送制御方法であって、
前記伝達関数推定手段が、送受信アンテナ間における伝達関数の推定を行うステップと、
前記伝送品質監視手段が、前記伝達関数推定手段が推定した前記伝達関数及び所定の条件に基づいて信号強度変更指示を前記複数の信号強度可変手段に入力するステップと、
前記伝送品質監視手段が、前記所定の誤り率を満たすように前記複数の誤り訂正符号化手段の誤り訂正符号化方式を設定するステップと、
前記指向性制御手段が、前記伝達関数推定手段が推定した前記伝達関数に基づいて、前記複数の指向性形成手段が形成する指向性変更指示を入力するステップと、
前記分配手段が、前記入力端子から入力される入力信号を前記出力端子の数の信号に分配して前記複数の出力端子のそれぞれから出力するステップと、
前記誤り訂正符号化手段が、設定される誤り訂正符号化方式に基づいて、前記出力端子から出力される信号に誤り訂正を行うステップと、
前記変調手段のうち、前記複数の信号強度可変手段から出力される出力信号が最大の強度となる信号強度可変手段に対応する変調手段が、前記誤り訂正符号化手段から入力される信号に対して単一搬送波周波数変調方式に基づいて変調を行い、当該変調手段以外の変調手段が、前記誤り訂正符号化手段から入力される信号に対して複数搬送波周波数変調方式に基づいて変調を行うステップと、
前記複数の信号強度可変手段が、前記伝送品質監視手段によって入力される信号強度変更指示に基づいて、入力される信号の強度を変更して出力するステップと、
前記指向性形成手段が、前記信号強度可変手段から出力される信号に対して指向性の形成を行うステップと、
前記合成手段が、記複数の指向性形成手段から出力される信号を合成し、合成した信号を前記送信アンテナから送信するステップと、
を含むことを特徴とする空間多重伝送制御方法。

Distributing means having an input terminal and a plurality of output terminals, a plurality of error correction coding means connected in association with each of the plurality of output terminals of the distributing means, and correspondence to each of the error correction coding means Connected to each of the modulation means, a plurality of signal intensity variable means connected in association with each of the modulation means, and a plurality of directivity forming means connected in association with each of the plurality of signal intensity variable means A plurality of combining means each having a transmission antenna and connected to each of the plurality of directivity forming means; and a transmission quality monitoring means connected to the plurality of signal intensity varying means and the plurality of error correcting means. A spatial multiplexing transmission comprising: directivity control means connected to the plurality of directivity forming means; and transfer function estimation means connected to the transmission quality monitoring means and the directivity control unit. A spatial multiplexing control method in the transmission device,
The transfer function estimating means estimating a transfer function between the transmitting and receiving antennas;
The transmission quality monitoring means inputting a signal strength change instruction to the plurality of signal strength variable means based on the transfer function estimated by the transfer function estimation means and a predetermined condition;
The transmission quality monitoring means setting an error correction coding system of the plurality of error correction coding means so as to satisfy the predetermined error rate;
The directivity control means inputs a directivity change instruction formed by the plurality of directivity formation means based on the transfer function estimated by the transfer function estimation means;
The distributing means distributing the input signal input from the input terminal to the number of signals of the output terminals and outputting from each of the plurality of output terminals;
The error correction coding means performing error correction on a signal output from the output terminal based on a set error correction coding method;
Among the modulating means, a modulating means corresponding to a signal strength varying means that outputs an output signal outputted from the plurality of signal strength varying means has a maximum strength is applied to a signal inputted from the error correction coding means. Performing modulation based on a single carrier frequency modulation scheme, and a modulation means other than the modulation means performing modulation on a signal input from the error correction coding means based on a multiple carrier frequency modulation scheme;
The plurality of signal strength varying means changing and outputting the strength of the input signal based on a signal strength change instruction input by the transmission quality monitoring means;
The directivity forming means performs directivity formation on the signal output from the signal intensity varying means;
The combining means combines the signals output from the plurality of directivity forming means, and transmits the combined signal from the transmission antenna;
A spatial multiplexing transmission control method comprising:

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EP2432137A2 (en) 2010-09-16 2012-03-21 Ricoh Company, Ltd. Wireless communication system, wireless communication device, and method

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EP1995979B1 (en) * 2007-05-23 2009-06-03 NTT DoCoMo, Inc. Subchannel allocation apparatus and corresponding method
JP5208453B2 (en) * 2007-06-19 2013-06-12 三星電子株式会社 Communication device and transmission rate setting method
US8509467B2 (en) 2009-07-29 2013-08-13 Electronics And Telecommunications Research Institute Human body sound transmission system and method for transmitting a plurality of signals

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2432137A2 (en) 2010-09-16 2012-03-21 Ricoh Company, Ltd. Wireless communication system, wireless communication device, and method
US8605708B2 (en) 2010-09-16 2013-12-10 Ricoh Company, Ltd. System, device and method for TDMA-based networking using space division multiplexed transmissions

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