JP2003258770A - Transmitter - Google Patents

Transmitter

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JP2003258770A
JP2003258770A JP2002058276A JP2002058276A JP2003258770A JP 2003258770 A JP2003258770 A JP 2003258770A JP 2002058276 A JP2002058276 A JP 2002058276A JP 2002058276 A JP2002058276 A JP 2002058276A JP 2003258770 A JP2003258770 A JP 2003258770A
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directivity
forming apparatus
apparatus
channel response
pieces
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JP3798325B2 (en
Inventor
Keizo Cho
Toshihiko Nishimura
Yasutaka Ogawa
Takeo Okane
Taiji Takatori
武雄 大鐘
恭孝 小川
寿彦 西村
敬三 長
泰司 鷹取
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Nippon Telegr & Teleph Corp <Ntt>
日本電信電話株式会社
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a transmitter in which demultiplexing characteristics can be improved in SDM. <P>SOLUTION: The transmitter for a system for communications by a space division multiplexing transmission system is provided with (k) ((k) is an integer of ≥2) directivity forming devices for forming (k) directivities, a directivity controllers for controlling the directivities of the directivity forming devices, a signal distributor for applying serial/parallel conversion or the like to a transmitting signal and outputting the signal to the (k) directivity forming devices, and a channel response receiver for receiving channel responses between the respective antenna elements of a transmitter transmitted from a receiver and the respective antenna elements of the receiver. Then, the directivity controller has a means for calculating a plurality of specific vectors from the matrix of AHA (H is Hermitean transform) by using a matrix A of sizes of N×M with the channel responses as elements, selecting (k) vectors in order from the largest specific values and setting (k) directivities determined with the (k) selected specific vectors as (k) directivities to be formed by the (k) directivity forming devices. <P>COPYRIGHT: (C)2003,JPO

Description

【発明の詳細な説明】 【0001】 【発明の属する技術分野】本発明は、送信装置に関し、 BACKGROUND OF THE INVENTION [0001] [Technical Field of the Invention The present invention relates to a transmission device,
特に、基地局から端末へ送信する信号の伝送容量を増やすことのできる送信装置に関する。 In particular, regarding the transmission device capable of increasing the transmission capacity of a signal transmitted from the base station to the terminal. 【0002】 【従来の技術】1つの基地局が多数のユーザと通信を行う無線通信として、移動通信がある。 [0002] As wireless communication BACKGROUND OF THE INVENTION one base station communicates with multiple users, there is a mobile communication. 近年、この移動通信の普及に伴い、無線通信ユーザが急速に増加している。 Recently, with the spread of the mobile communication, wireless communication users is increasing rapidly. また、近年、マルチメデイア通信の普及に伴い、通信される情報量も急速に増加している。 In recent years, with the spread of multimedia communication, the amount of information to be communicated has also sharply increased. かかる無線ユーザの増加および通信される情報量の増加に対処するためには、多数のユーサが通信を行うための広い帯域が必要であるが、無線周波数資源は限られているため、現在、 To account for increases and increased communicated the information amount of the wireless user is many Yusa is requires a large bandwidth for communication, because the radio frequency resources are limited, currently,
周波数をより有効に利用することが求められている。 There is a need to use the frequency more effectively. 【0003】周波数を有効に利用する方式としては、通信用に割り当てられた周波数を細かく分割し、これを複数のユーザに割り当てて通信を行う周波数分割多重アクセス方式(FDMA)、周波数チャネルを時間的に分割し、これを複数のユーザに割り当てて通信を行う時間分割多重アクセス方式(TDMA)、各ユーザに他の符号と直交性のある固有の符号を割り当て、帯域内に信号を拡散させて通信を行う符号分割多量アクセス方式(CD [0003] As a method to effectively use the frequency finely dividing a frequency allocated for communication, frequency division multiple access (FDMA), time the frequency channel that communicates by assigning it to a plurality of users divided into time division multiple access system for performing communication by assigning it to a plurality of users (TDMA), each user assigned a unique code with orthogonality with other codes, communication by spreading the signal in the band code division large amount of access method of performing (CD
MA)などが提案され、実際のシステムで使用されている。 MA), etc. have been proposed and used in the actual system. 【0004】空間分割多重伝送方式(Space Di [0004] The space division multiplexing transmission system (Space Di
vision Mu11ip1ex:SDM)も、これらの方式と同様に、周波数を有効に利用する方式として、提案されている方式である。 vision Mu11ip1ex: SDM), like the these methods, as a method to effectively use the frequencies, a method has been proposed. 【0005】この空間分割多重伝送方式とは、移動通信で一般的に生じるマルチパス環境の下、限られた帯域で情報の伝送容量を増加させる方式であって、基地局および端末に複数のアンテナを配置し、各アンテナから互いに異なる信号を同時に送信し、端末側の複数のアンテナアレーの指向性により、この同時に送信された複数の異なる信号を空間的に分離し受信する方式である(参考文献:例えば、Richard van Nee、All [0005] The space division multiplexing transmission system, under multipath environment caused common in mobile communications, a method for increasing the transmission capacity of information in a limited bandwidth, the plurality of base stations and a terminal antenna the place, transmits a different signal from each antenna at the same time, the directivity of the plurality of antenna array on the terminal side, a plurality of different signals transmitted this time is a method of receiving spatially separated (ref : For example, Richard van Nee, All
ert van Zeslt and Geert A ert van Zeslt and Geert A
water、“Maximum Likelihood water, "Maximum Likelihood
Decoding in a Space Divi Decoding in a Space Divi
sion Mu11ip1ex System”、IE sion Mu11ip1ex System ", IE
EE51st VTC 2000−Spring vo EE51st VTC 2000-Spring vo
l. l. 1、pp. 1, pp. 6−10、May 2000 Toky 6-10, May 2000 Toky
o、Japan)。 o, Japan). 【0006】なお、SDMのように基地局と端末のアンテナをアレーとする構成は、一般に、MIMO(Mul [0006] Note that the configuration of the array antenna of the base station and the terminal as SDM generally, MIMO (Mul
ti Input Multi Output)構成と言われる。 It is said to ti Input Multi Output) configuration. 【0007】図6は、従来のSDMの構成例を示す図である。 [0007] Figure 6 is a diagram illustrating a configuration example of a conventional SDM. 6−1は基地局のアンテナ、6−2は信号を各素子へ分配する信号分配装置、6−3は基地局装置、6− 6-1 of the base station antenna, 6-2 signal distribution apparatus for distributing signals to the elements, 6-3 base station apparatus, 6-
4は端末のアンテナ、6−5は信号復号装置、6−6は端末である。 4 terminal antennas, 6-5 signal decoding apparatus, 6-6 is a terminal. 【0008】図6における基地局の各アンテナ素子から送信された信号S 1 〜Snは、マルチパス伝搬路を通して端末に到来する。 [0008] signals S 1 to Sn transmitted from the antenna elements of the base station in FIG. 6, arrives to the terminal through the multipath propagation. 端末において信号S 1 〜Snを復号するためには、基地局の各アンテナと端末のアンテナ間のチャネル応答を推定すればよい。 To decode the signal S 1 to Sn in the terminal may be estimated channel response between each antenna and the terminal of the antenna of the base station. 【0009】この基地局の各アンテナと端末アンテナ間のチャネル応答は、例えば、基地局において、各アンテナから端末に対し異なるタイミングでトレーニング信号を送信した後、端末において、このトレーニング信号と受信する基地局の各アンテナからの信号との相関をとればよい。 [0009] The base to receive the channel responses between the antennas and the terminal antenna of the base station, for example, in the base station, after transmitting a training signal at different timings to the terminal from the antennas, the terminal, the training signal and it may take a correlation between the signals from each antenna station. 【0010】以上説明したように、上記従来のSDMを用いれば、周波数帯域を広げることなく、基地局または端末のいずれかアンテナ素子数の少ない方のアンテナの数だけ、信号を多重して伝送することが、理想的には可能である。 [0010] As described above, by using the conventional SDM, without widening the frequency band, the number of base stations or towards the antenna less any number of antenna elements of the terminal, and transmits the multiplexed signal it is ideal for possible. 【0011】 【発明が解決しようとする課題】しかし、上記従来のS [0011] The object of the invention is to be Solved However, the above-mentioned conventional S
DMでは、基地局にアレーアンテナを配置しているが、 In DM, but are arranged an array antenna to the base station,
このアレーアンテナを構成する各アンテナ素子からは、 From each antenna element constituting the array antenna,
異なる信号が送信される。 Different signals are transmitted. したがって、上記基地局のアレーアンテナでは、指向性の形成ができない。 Therefore, in the array antenna of the base station can not form directivity. 【0012】また、通常、アレーアンテナを構成するアンテナには、放射特性のほぼ等しいアンテナが用いられる。 [0012] Usually, the antennas constituting an array antenna, approximately equal antenna radiation characteristics are used. したがって、上記従来のSDMにおける、指向性を形成することができないアレーアンテナの各アンテナ素子から送信された信号は、ほほ同じ伝搬経路を通って端末に到来する。 Thus, the above in a conventional SDM, a signal transmitted from each antenna element of the array antenna can not form a directivity, arrives to the terminal through cheek the same propagation path. よって、上記従来のSDMでは、端末において多重化された信号を分離する際に、分離特性が劣化するという問題があった。 Thus, the in the conventional SDM, when separating the multiplexed signal at the terminal, the separation characteristics is deteriorated. 【0013】そこで、本発明は、かかる事情に鑑み、S [0013] Accordingly, the present invention has been made in view of such circumstances, S
DMにおいて、上記分離特性を向上することができる送信装置を提供することを目的とする。 In DM, and an object thereof is to provide a transmission apparatus capable of improving the separation characteristics. 【0014】 【課題を解決するための手段】本発明によれば、上記課題は、前記特許請求の範囲に記載の手段により解決される。 According to the present invention, in order to solve the problem] The problem is solved by means described in the scope of the appended claims. すなわち、請求項1に記載の発明は、M個(Mは2 That is, a first aspect of the present invention, M (M is 2
以上の整数)のアンテナ素子を備える送信装置とN個(Nは2以上の整数)のアンテナ素子を備える受信装置とが、空間分割多重伝送方式(SDM)で通信する通信システムにおける、前記送信装置であって、 【0015】前記送信装置が備えるM個のアンテナ素子にそれぞれ接続され、k個の指向性を形成するk個の指向性形成装置と、前記k個の指向性形成装置に接続され、指向性形成装置の指向性を制御する指向性制御装置と、前記k個の指向性形成装置に接続され、入力される送信信号に対して直並列変換や多値化などの処理を施し、これを前記k個の指向性形成装置に出力する信号分配装置と、 【0016】前記受信装置から送信される、前記受信装置が備えるチャネル応答推定装置により推定された、前記送信装置の各アンテ In a communication system and receiving device communicate with space division multiplex transmission method (SDM) transmission apparatus and N (N comprising an antenna element for an integer of 2 or more) comprising an antenna element or integer), the transmission device a is, [0015] respectively connected to the M antenna elements in which the transmitting device comprises a k-number of directional forming apparatus for forming a k-number of directional, connected to said k pieces of directivity forming apparatus a directivity control unit for controlling the directivity of directional forming apparatus, which is connected to the k directivity forming apparatus performs processing such as serial-parallel conversion and multi-level to the transmission signal input, a signal distribution apparatus for outputting it to said k pieces of directivity forming apparatus, [0016] is transmitted from the receiving device, which is estimated by the receiving apparatus channel response estimation device provided, each antenna of the transmitting device 素子と前記受信装置の各アンテナ素子の間のチャネル応答を受信するチャネル応答受信装置と、を備え、 【0017】前記指向性制御装置は、前記受信したチャネル応答を要素とするN×Mの大きさの行列Aを用いA And a channel response receiver for receiving a channel response between each antenna element of the device and the receiving device, [0017] the directional control device, the size of N × M whose elements the received channel response a using the difference of the matrix a
H A( Hはエルミート変換)の行列から複数の固有ベクトルを算出する算出手段と、 【0018】前記算出手段により算出した複数の固有ベクトルを固有値の大きい方から順にk個選択する選択手段と、前記選択手段により選択されたk個の固有ベクトルで定まるk個の指向性を、前記k個の指向性形成装置が形成するk個の指向性として設定する手段と、を有することを特徴とする送信装置である。 A calculating means H A (H is the Hermitian transform) calculates a plurality of eigenvectors from a matrix of, [0018] selection means for the k choose multiple eigenvectors from the largest eigenvalues calculated by the calculating means, said selection k number of directivity determined by the selected k eigenvectors by means at the transmission apparatus characterized by having a means for setting as the k directivities said k pieces of directivity forming apparatus forms is there. 【0019】請求項2に記載の発明は、M個(Mは2以上の整数)のアンテナ素子を備える送信装置とN個(N [0019] According to a second aspect of the invention, M (M is an integer of 2 or more) transmission system and N (N comprising an antenna element
は2以上の整数)のアンテナ素子を備える受信装置とが、空間分割多重伝送方式(SDM)で通信する通信システムにおける、前記送信装置であって、 【0020】前記送信装置が備えるM個のアンテナ素子にそれぞれ接続され、k個(kは2以上の整数)の指向性を形成するk個の指向性形成装置と、前記k個の指向性形成装置に接続され、指向性形成装置の指向性を制御する指向性制御装置と、前記k個の指向性形成装置に接続され、入力される送信信号に対して直並列変換や多値化などの処理を施し、これを前記k個の指向性形成装置に出力する信号分配装置と、前記送信装置の各アンテナ素子と前記受信装置の各アンテナ素子の間のチャネル応答を推定するチャネル応答推定装置と、を備え、 【0021】前記指向性制御装置は、 M antennas with the a receiving device comprising an antenna element an integer of 2 or more) is, in a communication system that communicates with space division multiplex transmission method (SDM), a the transmitting device, [0020] The transmitting device are connected to the element, the k (k is an integer of 2 or more) are connected to the k directivity forming apparatus that forms a directivity of said k-number of directional forming apparatus, the directivity of the directional forming apparatus a directivity control unit for controlling, which is connected to the k directivity forming apparatus performs processing such as serial-parallel conversion and multi-level to the transmission signal input, said k pieces of directivity this comprising a signal distribution unit for outputting the forming apparatus, and a channel response estimator for estimating a channel response between each antenna element of the receiving device and the antenna elements of the transmitting device, [0021] the directional control device It is, 記チャネル応答推定装置により推定したチャネル応答を要素とするN× N × for the channel response estimated by serial channel response estimation unit and elements
Mの大きさの行列Aを用いA H A( Hはエルミート変換) Using the matrix A of size of M A H A (H is a Hermitian transformation)
の行列から複数の固有ベクトルを算出する算出手段と、 Calculation means for calculating a plurality of eigenvectors from a matrix,
前記算出手段により算出した複数の固有ベクトルを固有値の大きい方から順にk個選択する選択手段と、前記選択手段により選択されたk個の固有ベクトルで定まるk Selection means for the k choose multiple eigenvectors from the largest eigenvalues ​​calculated by the calculating means, k determined by the selected k eigenvectors by said selection means
個の指向性を、前記k個の指向性形成装置が形成するk The number of directional, the k pieces of directivity forming apparatus forms k
個の指向性として設定する手段と、を有することを特徴とする送信装置である。 A transmission device, characterized in that it comprises means for setting the number of directivity, a. 【0022】一般に、SDMにおいては、複数の伝搬方向が存在する。 [0022] Generally, in the SDM, there are a plurality of propagation directions. この伝搬方向の数をk個とすると、本発明に係る送信装置は、k個の指向性形成装置を備える。 When the number of the propagation direction and the k, the transmission device according to the present invention comprises a k-number of directional forming apparatus.
すなわち、本発明に係る送信装置は、SDMにおける伝搬方向に対応する数の指向性形成装置を備える。 That is, the transmission apparatus according to the present invention comprises a number of directional forming apparatus corresponding to the propagation direction in the SDM. 【0023】本発明によれば、SDMにおいて使用される複数の指向性は、基地局と端末とが有する素子間のチャネル応答に基づき設定される。 According to the present invention, a plurality of directional used in SDM is set based on the channel response between the elements included in the base station and the terminal. したがって、本発明に係る送信装置を用いれば、SDMの端末における分離特性を向上させることができる。 Therefore, the use of the transmission apparatus according to the present invention, it is possible to improve the isolation characteristics in the terminal of SDM. 【0024】以下に、指向性の決定の有効性に関する原理について述べる。 [0024] The following describes principle of the effectiveness of the determination of the directivity. 送信信号をS(t)、指向性形成装置の量みベクトルをw、雑音をn、端末アンテナでの受信信号ベクトルをrとすると、受信信号rは以下の式で表される。 The transmission signal S (t), the amount seen vector of beamforming apparatus w, when the noise n, the received signal vector at the terminal antenna and r, the received signal r is expressed by the following equation. 【0025】 【数1】 [0025] [number 1] ただし、 【0026】 【数2】 However, [0026] [number 2] 【0027】 【数3】 [0027] [number 3] 【0028】 【数4】 [0028] [number 4] ここで、端末のアンテナにおいて、送信信号に対して最大比合成受信を行う場合、端末アンテナアレーのウェイトは(AW H )で表されるため、最大比合成受信時の端末での出力信号yは、 【0029】 【数5】 Here, in the antenna of the terminal, when the maximum ratio combining reception to the transmission signal, because the weight of the terminal antenna array represented by (AW H), the output signal y of the terminal at the maximum ratio combining reception , [0029] [number 5] となる。 To become. ここで、行列A H Aは非負のエルミート行列である。 Here, the matrix A H A is the non-negative Hermitian matrix. よって、出力yの希望波成分を最大とするためには、数5のA H Aの最大圃有値に対応する固有ベクトルを用いればよい、 【0030】また、n番目に大きい固有値に対応する固有ベクトルを重みとする放射特性は、n−1番目までの圃有値に対応する固有ベクトルを重みとした放射特性と直交する特性を有するため、このような指向性を基地局に順次与えることにより、その直交性から、異なる信号系列の分離特性がよくなる。 Therefore, in order to maximize the desired signal component of the output y may be used eigenvector corresponding to the largest圃有value of the number 5 of A H A, Further, eigenvectors corresponding to the largest eigenvalue to the n-th radiation characteristics and weights, in order to have the properties perpendicular to the radiation characteristics in which the eigenvector corresponding to 圃有 value up to the (n-1) th and weight, by providing sequentially such directivity to the base station, the from orthogonality, the better separation characteristics of the different signal sequences. 【0031】 【発明の実施の形態】以下に、添付図面を参照しつつ、 [0031] BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, with reference to the accompanying drawings,
本発明に係る適応アレーアンテナ装置の好適な実施の形態を詳細に説明する。 The preferred embodiment of an adaptive array antenna apparatus according to the present invention will be described in detail. 【0032】図1は、本発明の第1の実施の形態に係る送信装置を示す図である。 [0032] Figure 1 is a diagram showing a transmission apparatus according to a first embodiment of the present invention. 図1に示す送信装置を備えた基地局は、受信装置を備えた端末と通信する。 Base station having a transmitting apparatus shown in FIG. 1, communicate with the terminal having a receiver. 図1において、1−1は送信装置アンテナ素子、1−2は指向性形成装置、1−3は信号分配装置、1−4は指向性制御装置、1−5は送信装置、1−6は受信装置アンテナ素子、1、7はチャネル応答推定装置、1−8は受信装置である。 1, the transmitting device antenna elements 1-1, 1-2 directivity forming apparatus, 1-3 signal distributor, 1-4 directivity control apparatus, 1-5 transmitting apparatus, 1-6 receiving apparatus antenna elements, 1,7 is the channel response estimation unit, 1-8 is a reception device. 【0033】基地局は、各アンテナからトレーニング信号を順次信号を送信し、端末は、各アンテナを介して該送信されたトレーニング信号を受信する。 The base station transmits sequentially signal a training signal from each antenna, the terminal receives the training signals the transmission through each antenna. 端末に配置されたチャネル応答推定装置は、この受信したトレーニング信号を用いて、基地局の各アンテナと端末の各アンテナ間のチャネル応答を推定する。 Channel response estimation unit which is arranged in the terminal uses a training signal the received estimates the channel response between each antenna of each antenna and the terminal of the base station. ここで、基地局のi番目の素子と端末のk番目の素子間のチャネル応答はa ik Here, the channel response between the i-th element and the terminal of the k-th element of the base station is a ik
と表記する。 It referred to as. 【0034】端末は、推定したチャネル応答を基地局へ返送する。 The terminal returns the estimated channel response to the base station. 返送されたチャネル応答の情報は、基地局のチャネル応答情報受信手段により受信された後、指向性制御装置に入力される。 Information of the return channel response, after being received by the channel response information receiving means of the base station, is input to the directivity control device. 【0035】なお、本実施の形態においては、端末がチャネル応答推定装置を備えているが、このチャネル応答推定装置は、基地局が備えてもよい。 [0035] In the present embodiment, the terminal but is provided with a channel response estimation unit, the channel response estimation unit, the base station may be provided. この場合、基地局が備えるチャネル応答推定装置は、端末から送信される信号に基づいて基地局の各アンテナと端末の各アンテナ間のチャネル応答を推定し、この推定したチャネル応答の情報を指向性制御装置へ出力する。 In this case, channel response estimation apparatus provided in the base station, the channel response between each antenna of each antenna and the terminal of the base station estimated based on the signal transmitted from the terminal, the directivity information of the estimated channel response to output to the control device. 【0036】基地局は、数6に示すチャネル応答行列の積で与えられる行列の固有値及び固有ベクトルを求め、 [0036] The base station obtains the eigenvalues ​​and eigenvectors of a given matrix the product of the channel response matrix shown in Equation 6,
固有べクトルの値を各アンテナの指向性のウェイトとして、固有値の大きな方から順次、指向性形成装置に与える。 The value of the intrinsic base vector as weights directivity of the antennas, successively from the larger eigenvalue provides a beamforming apparatus. 【0037】すなわち、基地局の送信装置は、得られた複数の固有ベクトルを固有値の大きい方から順にk個選択し、それらk個の固有ベクトルで定まる指向性をk個の指向性形成装置の指向性として設定する。 [0037] That is, the transmission apparatus of the base station, the k select multiple eigenvectors obtained from the largest eigenvalue in order, the directivity of the directional determined by their k eigenvectors k number of directional forming apparatus to set up as. 【0038】 【数6】 [0038] [6] 直並列変換装置は、送信信号を入力され、この送信信号を並列変換し、各指向性形成装置へ出力する。 Serial-to-parallel converter is input to the transmission signal, the transmission signal is parallel conversion, and outputs it to the directivity forming apparatus. この送信信号は、各指向性形成装置への出力に際し、必ずしも等分配される必要はない。 The transmission signal, when output to the directivity forming apparatus need not be equally distributed necessarily. また、直並列変換装置は、並列変換した送信信号を多値変調を行う信号分配装置へ出力してもよい。 The serial-parallel converter may output the transmission signal in parallel converted into a signal distribution apparatus for performing multi-level modulation. この場合、信号分配装置は、入力された送信信号に多値変調を施した後、これを各指向性形成装置へ出力する。 In this case, the signal distribution apparatus, was subjected to a multi-level modulation on the inputted transmission signal, and outputs it to the directivity forming apparatus. 【0039】図2は、本発明の第2の実施の形態に係る送信装置を示す図である。 [0039] FIG. 2 is a diagram showing a transmission apparatus according to a second embodiment of the present invention. 送信装置には、指向性形成装置2−2が一つだけ配置され、信号分配装置2−3は、 The transmitting device, the directivity forming apparatus 2-2 is arranged only one, the signal distributor 2-3,
信号を16QAM変調信号に変換している。 And converts the signal to 16QAM modulated signal. ここでは、 here,
基地局アンテナの素子数を2素子、端末の素子数を2素子としている。 The number of elements of the base station antennas 2 elements, the number of elements of the terminal is set to 2 elements. 【0040】端末は、求めた基地局の各アンテナと端末の各アンテナの間のチャネル応答を、アップリンク信号などで基地局に返送する。 The terminal a channel response between each antenna of each antenna and the terminal of the determined base station, returns, etc. in the base station uplink signal. 図3は、第2の実施の形態における送信電力と平均誤り率の関係のシミュレーション結果を示す図である。 Figure 3 is a graph showing simulation results of the average error rate relation and the transmission power in the second embodiment. ここで、送信電力は、無指向性アンテナ1素子について平均E s /N 0 (多値化された信号の電力と雑音電力の比)が0dBとなるときの送信電力で規格化した総送信電力である。 Here, the transmission power is the total transmit power normalized by transmission power when averaged over omni-directional antenna 1 element E s / N 0 (power and noise power ratio of the multi-valued signal) is 0dB it is. 【0041】伝搬環境は、各送信・受信アンテナごとに独立な準性的レイリーフェージングとした。 The propagation environment, was an independent quasi-sexual Rayleigh fading for each transmit and receive antenna. また、各素子間のチャネル応答行列Aは既知とした。 The channel response matrix A between the respective elements was known. 比較のために、送信装置の各アンテナから異なる信号を送信して端末のアレーアンテナで受信する従来のSDMを用いたときの誤り率特性も第3図に併せて示す。 For comparison, also shown in the error rate characteristics Figure 3 when using a conventional SDM for receiving and transmitting different signals from each antenna of the transmitter array antenna of the terminal. 【0042】このSDMによる伝送容量は、本実施の形態における伝送容量と等しくしている。 The transmission capacity by the SDM is equal to the transmission capacity in the present embodiment. 図3に示すように、本発明によれば、誤り率10 3を得る送信電力を1 As shown in FIG. 3, according to the present invention, the transmission power to obtain the error rate of 10 3 1
5dB以上低減できる。 It can be reduced by more than 5dB. 【0043】図4は、本発明の第3の実施の形態を示す図である。 [0043] Figure 4 is a diagram showing a third embodiment of the present invention. 図4においては、送信装置には、指向性形成装置が2つ配置されており(4−2−1、4−2− In FIG. 4, the transmitting apparatus, the directivity forming device is arranged two (4-2-1,4-2-
2)、一方の指向性形成装置4−2−1の重みには最大固有値に対応する固有ベクトルを用い、他方の指向性形成装置4−2−2の重みには2番目に大きい固有値に対応する固有ベクトルを用いている。 2), using the eigenvector corresponding to the largest eigenvalue to the weight of one of the directional forming apparatus 4-2-1, the weight of the other directional forming apparatus 4-2-2 corresponding to large eigenvalues ​​in the second We are using the eigenvectors. 【0044】図5は、第3の実施の形態における送信電力と平均誤り率の関係のシミュレーション結果を示す図である。 [0044] Figure 5 is a diagram showing the simulation results of the average error rate relation and the transmission power in the third embodiment. ここで、送信装置の素子数は4である。 Here, the number of elements of the transmitter is 4. 信号分配装置は、指向性形成装置4−2−1(最大固有値に対応する固有ベクトルを重みとしたビーム)へ64QAM Signal distribution apparatus, the directivity forming apparatus 4-2-1 to (beam and weights the eigenvector corresponding to the largest eigenvalue) 64QAM
で変調した信号を出力し、指向性形成装置4−2−2 In outputting the modulated signal, the directivity forming apparatus 4-2-2
(第2固有値に対応する固有ベクトルを重みとしたビーム)へQPSKで変調した信号を出力している。 And it outputs the modulated signal by QPSK to (beam with weights eigenvector corresponding to the second eigenvalue). 【0045】その他の計算条件は図3の場合と同様である。 [0045] Other calculation conditions are the same as in FIG. 比較として、4素子を用いたSDMでの結果、および第2の実施の形態の構成で256QAM変調した信号を送信した場合の結果を、図5に併せて示す。 As a comparison, in the SDM using four elements results, and the results of the case of transmitting 256QAM modulated signal in the configuration of the second embodiment, also shown in FIG. ここでも、3つの構成の場合の総伝送容量は同じとなっている。 Again, the total transmission capacity of the case of the three configurations have the same. 【0046】図5より、本実施の形態のように、送信装置に2つの指向性形成回路を配置し、固有値の大きい順に固有ベクトルを指向性形成装置の重みとすることによって伝送特性が改善できることがわかる。 [0046] From FIG. 5, as in the present embodiment, the two directional forming circuit arranged to the transmission device, to be able to improve the transmission characteristic by the weight of the directional forming apparatus eigenvectors in descending order of eigenvalue Recognize. 本実施の形態では、最大固有値に対する指向性形成装置と他方の指向性形成装置に入力する信号の多値度が64QAMとQP In this embodiment, multi-value level is 64QAM and QP of the signal input to the directivity forming apparatus and the other directional forming apparatus to the maximum eigenvalue
SKと異なるが、これは16QAMと16QAMのように同等にしてもよい。 SK is different, but this may be equally as 16QAM and 16QAM. 【0047】 【発明の効果】以上説明したように、本発明によれば、 [0047] As has been described in the foregoing, according to the present invention,
周波数帯域を広げることなく無線信号の伝送容量をあげることができるため、次世代の無線通信に求められている大容量通信を実現することができるとともに、限りのある周波数資源を有効に活用することができる。 It is possible to increase the transmission capacity of a radio signal without widening the frequency band, it is possible to realize a large capacity communication sought to wireless communication of the next generation, to effectively utilize the frequency resources with limited can.

【図面の簡単な説明】 【図1】本発明の第1の実施の形態に係る送信装置を示す図である。 It is a diagram illustrating a transmission apparatus according to a first embodiment of BRIEF DESCRIPTION OF THE DRAWINGS [Figure 1] present invention. 【図2】本発明の第2の実施の形態に係る送信装置を示す図である【図3】第2の実施の形態における送信電力と平均誤り率の関係のシミュレーション結果を示す図である。 3 is a diagram showing a transmission apparatus according to a second embodiment of the present invention; FIG is a diagram showing a simulation result of a relationship between transmission power and the average error rate in the second embodiment. 【図4】本発明の第3の実施の形態を示す図である。 Is a diagram showing a third embodiment of the present invention; FIG. 【図5】第3の実施の形態における送信電力と平均誤り率の関係のシミュレーション結果を示す図である。 5 is a diagram showing a simulation result of the relationship between transmission power and the average error rate in the third embodiment. 【図6】従来のSDMの構成例を示す図である。 6 is a diagram showing a configuration example of a conventional SDM. 【符号の説明】 1−1 基地局アンテナ素子1−2 指向性形成装置1−3 信号分配装置1−4 指向性制御装置1−5 基地局装置1−6 端末アンテナ索子1−7 チャネル応答推定装鷺1−8 端末装置2−1 基地局アンテナ素子2−2 指向性形成装置2−3 信号分配装置2−4 指向性制御装置2−5 基地局装置2−6 端末アンテナ素子2−7 チャネル応答推定装置2−8 端末装置4−1 基地局アンテナ素子4−2−1 指向性形成装置4−2−2 指向性形成装置4−3 信号分配装置4−4 指向性制御装置4−5 基地局装置4−6 端末アンテナ素子4−7 チャネル応答推定装置4−8 端末装置6−1 基地局アンテナ素子6−2 信号分配装置6−3 基地局装置6−4 端末アンテナ素子6−5 信号復号装置6−6 端末装置 [Description of Reference Numerals] 1-1 base station antenna elements 1-2 directivity forming apparatus 1-3 signal distributor 1-4 directivity control apparatus 1-5 base station apparatus 1-6 terminal antenna Sakuko 1-7 channel response estimation Sosagi 1-8 terminal 2-1 the base station antenna elements 2-2 directivity forming unit 2-3 signal distributor 2-4 directivity control apparatus 2-5 base station apparatus 2-6 terminal antenna elements 2-7 The channel response estimation unit 2-8 terminal 4-1 base station antenna element 4-2-1 directivity forming apparatus 4-2-2 directivity forming apparatus 4-3 signal distributor 4-4 directivity control apparatus 4-5 The base station apparatus 4-6 terminal antenna elements 4-7 channel response estimation unit 4-8 terminal device 6-1 the base station antenna elements 6-2 signal distributor 6-3 base station apparatus 6-4 terminal antenna elements 6-5 signal decoder 6-6 terminal

───────────────────────────────────────────────────── フロントページの続き (72)発明者 大鐘 武雄 北海道札幌市西区発寒10条11丁目1−8− 1003 (72)発明者 小川 恭孝 北海道札幌市白石区南郷通8丁目南3−1 −B307 (72)発明者 西村 寿彦 北海道札幌市東区北41条東16丁目2−19 Fターム(参考) 5K022 FF00 5K059 AA12 CC01 CC04 DD31 5K067 AA21 BB02 CC24 EE02 EE10 ────────────────────────────────────────────────── ─── of the front page continued (72) inventor Takeo Ogane Sapporo, Hokkaido, Nishi-ku, Hassamu 10 Article 11 chome 1-8- 1003 (72) inventor Ogawa Yasutaka Sapporo, Hokkaido Shiroishi-ku, Nangodori 8-chome, Minami 3-1 -B307 (72) inventor Toshihiko Nishimura Hokkaido, Sapporo Higashi-ku, Kita 41 Johigashi 16-chome, 2-19 F-term (reference) 5K022 FF00 5K059 AA12 CC01 CC04 DD31 5K067 AA21 BB02 CC24 EE02 EE10

Claims (1)

  1. 【特許請求の範囲】 【請求項1】 M個(Mは2以上の整数)のアンテナ素子を備える送信装置とN個(Nは2以上の整数)のアンテナ素子を備える受信装置とが、空間分割多重伝送方式(SDM)で通信する通信システムにおける、前記送信装置であって、 前記送信装置が備えるM個のアンテナ素子にそれぞれ接続され、k個(kは2以上の整数)の指向性を形成するk個の指向性形成装置と、 前記k個の指向性形成装置に接続され、指向性形成装置の指向性を制御する指向性制御装置と、 前記k個の指向性形成装置に接続され、入力される送信信号に対して直並列変換や多値化などの処理を施し、これを前記k個の指向性形成装置に出力する信号分配装置と、 前記受信装置から送信される、前記受信装置が備えるチャネル応答推定装置 Transmitting apparatus and N with the antenna elements of the Claims 1] M (M is an integer of 2 or more) (N is an integer of 2 or more) and the receiving device comprising an antenna element of the spatial in a communication system for communicating division multiplex transmission method (SDM), a said transmission device are connected to the M antenna elements in which the transmitting device comprises, the directivity of the k (k is an integer of 2 or more) and k pieces of directivity forming apparatus for forming the connected to the k directivity forming apparatus, and a directivity control apparatus for controlling directivity of directional forming apparatus, connected to said k pieces of directivity forming apparatus , subjected to processing such as serial-parallel conversion and multi-level to the transmission signal input, a signal distribution apparatus for outputting it to said k pieces of directivity forming apparatus, is transmitted from the receiving apparatus, the receiving channel response estimation apparatus comprising apparatus より推定された、前記送信装置の各アンテナ素子と前記受信装置の各アンテナ素子の間のチャネル応答を受信するチャネル応答受信装置と、を備え、 前記指向性制御装置は、前記受信したチャネル応答を要素とするN×Mの大きさの行列Aを用いA H A( Hはエルミート変換)の行列から複数の固有ベクトルを算出する算出手段と、前記算出手段により算出した複数の固有ベクトルを固有値の大きい方から順にk個選択する選択手段と、前記選択手段により選択されたk個の固有ベクトルで定まるk個の指向性を、前記k個の指向性形成装置が形成するk個の指向性として設定する手段と、を有することを特徴とする送信装置。 More was estimated, the and a channel response receiver for receiving the channel response between each antenna element of each antenna element and the receiving device of the transmitting device, the directional control device, the received channel response a calculating means (the H to Hermite transform) a H a using the magnitude of the matrix a of N × M calculates a plurality of eigenvectors from a matrix of which the elements, a plurality of larger eigenvalues eigenvectors calculated by the calculating means selection means for the k choose from, means for setting the k directivities determined by the k eigenvectors selected by the selecting means, as the k directivities said k pieces of directivity forming apparatus forms transmitting apparatus characterized by having, when. 【請求項2】 M個(Mは2以上の整数)のアンテナ素子を備える送信装置とN個(Nは2以上の整数)のアンテナ素子を備える受信装置とが、空間分割多重伝送方式(SDM)で通信する通信システムにおける、前記送信装置であって、 前記送信装置が備えるM個のアンテナ素子にそれぞれ接続され、k個(kは2以上の整数)の指向性を形成するk個の指向性形成装置と、 前記k個の指向性形成装置に接続され、指向性形成装置の指向性を制御する指向性制御装置と、 前記k個の指向性形成装置に接続され、入力される送信信号に対して直並列変換や多値化などの処理を施し、これを前記k個の指向性形成装置に出力する信号分配装置と、 前記送信装置の各アンテナ素子と前記受信装置の各アンテナ素子の間のチャネル応答を推定する Wherein M (M is an integer of 2 or more) (the N integer of 2 or more) transmission system and N with the antenna element of the receiving device comprising an antenna element, space division multiplex transmission method (SDM in a communication system that communicates with) an the transmission device, the transmission device are connected to M antenna elements included in, the k (k is oriented of k that forms a directivity of 2 or more integer) and sex forming apparatus, connected to said k pieces of directivity forming apparatus, and a directivity control apparatus for controlling directivity of directional forming apparatus, connected to said k pieces of directivity forming apparatus, transmission signal input subjected to processing such as serial-parallel conversion and multi-valued relative to the signal distribution apparatus for outputting it to said k pieces of directivity forming apparatus, the respective antenna elements of the receiving device and each antenna element of the transmission device It estimates the channel response between ャネル応答推定装置と、を備え、 前記指向性制御装置は、前記チャネル応答推定装置により推定したチャネル応答を要素とするN×Mの大きさの行列Aを用いA H A( Hはエルミート変換)の行列から複数の固有ベクトルを算出する算出手段と、前記算出手段により算出した複数の固有ベクトルを固有値の大きい方から順にk個選択する選択手段と、前記選択手段により選択されたk個の固有ベクトルで定まるk個の指向性を、前記k個の指向性形成装置が形成するk個の指向性として設定する手段と、を有することを特徴とする送信装置。 Comprising Yaneru a response estimator, and the directional control device, using the matrix A of size of N × M whose elements channel response estimated by the channel response estimation unit A H A (H is a Hermitian transformation) calculation means for calculating a plurality of eigenvectors from a matrix of a selection means for the k choose multiple eigenvectors from the largest eigenvalues ​​calculated by the calculating means, determined by the k eigenvectors selected by said selection means k number of directivity, the k pieces of directivity forming apparatus transmitting apparatus characterized by having a means for setting a k-number of directional forming the.
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