JP2001217759A - Radio communication equipment and radio communication method by adaptive array - Google Patents
Radio communication equipment and radio communication method by adaptive arrayInfo
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- JP2001217759A JP2001217759A JP2000022288A JP2000022288A JP2001217759A JP 2001217759 A JP2001217759 A JP 2001217759A JP 2000022288 A JP2000022288 A JP 2000022288A JP 2000022288 A JP2000022288 A JP 2000022288A JP 2001217759 A JP2001217759 A JP 2001217759A
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Abstract
Description
【０００１】[0001]
【発明の属する技術の分野】本発明は、複数のアンテナ
を空間的に分散配置し、各アンテナで送受信する信号の
振幅と位相を制御することでアンテナの指向性を最適に
するアダプティブアレー通信方式を採用する無線通信装
置及びアダプティブアレーによる無線通信方法に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adaptive array communication system in which a plurality of antennas are spatially dispersed and the directivity of the antennas is optimized by controlling the amplitude and phase of signals transmitted and received by each antenna. And a wireless communication method using an adaptive array.
【０００２】[0002]
【従来の技術】現行のＰＨＳ(Personal Handy Phone Sy
stem)では、無線アクセス方式としてマルチキャリア４
ｃｈのＴＤＭＡ(Time Division Multiple Access)方
式、伝送方式としてＴＤＤ(Time Division Duplex)方式
が採用されている。これは、同一周波数で送信情報と受
信情報とを交互に通信するとともに、時分割多重伝送す
る方式である。2. Description of the Related Art Current PHS (Personal Handy Phone Sy)
stem), multi-carrier 4
The TDMA (Time Division Multiple Access) system of the channel and the TDD (Time Division Duplex) system as a transmission system are employed. This is a system in which transmission information and reception information are alternately communicated at the same frequency and time-division multiplexed.
【０００３】具体的には、ＰＨＳが採用するＴＤＭＡ／
ＴＤＤ方式は、基地局から端末への下り回線に４スロッ
ト、端末から基地局への上り回線に４スロットの合計８
スロットを１つのフレームとして周期的に送受信を行う
ものである。[0003] Specifically, the TDMA /
The TDD scheme has a total of eight slots, four slots for the downlink from the base station to the terminal and four slots for the uplink from the terminal to the base station.
The transmission and reception are performed periodically using the slot as one frame.
【０００４】ところで、ＰＨＳシステムでは、同一の無
線チャネルをある一定の距離を置いて繰り返し置局す
る。このとき、例えば、図６に示すように、隣接する２
つの基地局３１、３２が同一周波数を使用することが起
こる。[0004] In the PHS system, the same radio channel is repeatedly placed at a certain distance. At this time, for example, as shown in FIG.
It happens that two base stations 31, 32 use the same frequency.
【０００５】そうすると、基地局３１のサービスエリア
３３にいる移動端末３４が基地局３２のサービスエリア
３５に近づくと、基地局３２では、移動端末３４の送信
波が干渉波として受信されるので、混信するおそれがあ
る。同様に、基地局３２のサービスエリア３５にいる移
動端末３６が基地局３１のサービスエリア３３に近づく
と、基地局３１では、移動端末３６の送信波が干渉波と
して受信されるので、混信するおそれがある。When the mobile terminal 34 located in the service area 33 of the base station 31 approaches the service area 35 of the base station 32, the base station 32 receives the transmission wave of the mobile terminal 34 as an interference wave, so that interference occurs. There is a possibility that. Similarly, when the mobile terminal 36 located in the service area 35 of the base station 32 approaches the service area 33 of the base station 31, the base station 31 receives the transmission wave of the mobile terminal 36 as an interference wave, which may cause interference. There is.
【０００６】このような場合、点線で囲って示すよう
に、基地局３１は移動端末３４と確実に通信でき、基地
局３２は移動端末３６と確実に通信できるように、それ
ぞれの基地局では干渉波を抑圧する措置を採る必要があ
る。これに対する有効な措置として基地局にアダプティ
ブアレー通信方式を導入することが提案されている(文
献「低アンテナ高基地局アダプティブアレーの同一チャ
ネル干渉除去特性」電子情報通信学会論文誌、B-II，Vo
l.J81-B-II,No.1,pp1-9,1998年1月)。In such a case, as shown by the dotted line, the base station 31 can communicate with the mobile terminal 34 reliably, and the base station 32 can reliably communicate with the mobile terminal 36. It is necessary to take measures to suppress the waves. As an effective measure against this, it has been proposed to introduce an adaptive array communication scheme in the base station (Refer to the document "Co-channel interference rejection characteristics of low antenna high base station adaptive array" IEICE Transactions, B-II, Vo
l.J81-B-II, No.1, pp1-9, January 1998).
【０００７】このアダプティブアレー通信方式は、基地
局に複数のアンテナを空間的に分散配置し、各アンテナ
で送受信する信号の振幅と位相を制御することでアンテ
ナの指向性を最適にする技術である。これは、ＰＨＳが
採用するＴＤＭＡ／ＴＤＤ方式では、送信周波数と受信
周波数が同一であるため、上り回線と下り回線の伝搬路
特性が一致することを利用したものである。以下、図７
を参照して具体的に説明する。The adaptive array communication system is a technology in which a plurality of antennas are spatially dispersed in a base station, and the directivity of the antennas is optimized by controlling the amplitude and phase of signals transmitted and received by each antenna. . This is based on the fact that, in the TDMA / TDD system adopted by the PHS, the transmission frequency and the reception frequency are the same, so that the propagation path characteristics of the uplink and the downlink match. Hereinafter, FIG.
This will be specifically described with reference to FIG.
【０００８】図７は、アダプティブアレー通信方式を採
用する無線通信装置の構成例である。なお、アダプティ
ブアレーを構成するアンテナ素子の数は、４本〜８本と
されているが、図７では、説明の便宜から、２つのアン
テナ素子１−１、１−２が空間配置される場合を示して
ある。FIG. 7 shows an example of the configuration of a radio communication apparatus adopting the adaptive array communication system. Although the number of antenna elements constituting the adaptive array is set to four to eight, FIG. 7 shows a case where two antenna elements 1-1 and 1-2 are spatially arranged for convenience of explanation. Is shown.
【０００９】図７において、この無線通信装置では、ア
ンテナ素子が２つであるので、受信処理系と送信処理系
は、それぞれ２系統設けられ、それぞれ送受信共用器２
−１、２−２を介してアンテナ素子１−１、１−２に接
続される。そして、受信ウエイト制御部３からの制御信
号により、アンテナ素子１−１、１−２の受信信号の振
幅及び位相を制御して受信処理系の指向特性が最適に制
御される。また、送信ウエイト制御部４からの制御信号
により、アンテナ素子１−１、１−２への送信信号の振
幅及び位相を制御して送信処理系の指向特性が最適に制
御される。In FIG. 7, since this radio communication apparatus has two antenna elements, two reception processing systems and two transmission processing systems are provided,
-1, 2-2 are connected to the antenna elements 1-1, 1-2. Then, the control signal from the reception weight control unit 3 controls the amplitude and phase of the reception signals of the antenna elements 1-1 and 1-2 to optimally control the directivity of the reception processing system. In addition, the control signal from the transmission weight control unit 4 controls the amplitude and phase of the transmission signal to the antenna elements 1-1 and 1-2 to optimally control the directivity of the transmission processing system.
【００１０】２系統の受信処理系は、送受信共用器２−
１、２−２を介してアンテナ素子１−１、１−２から入
力する無線受信信号を増幅・中間周波信号へのダウンコ
ンバート・復調処理をし、ベースバンド受信信号を出力
する無線受信部５−１、５−２と、ベースバンド受信信
号を可変増幅する増幅器６−１、６−２と、増幅された
受信信号の位相を進遅する移相器７−１、７−２とで構
成される。The two reception processing systems include a transmission / reception duplexer 2-
A radio receiving unit 5 that amplifies, downconverts and demodulates a radio reception signal input from the antenna elements 1-1 and 1-2 via the antenna elements 1-1 and 1-2 to an intermediate frequency signal, and outputs a baseband reception signal. -1, 5-2, amplifiers 6-1 and 6-2 for variably amplifying the baseband reception signal, and phase shifters 7-1 and 7-2 for advancing and delaying the phase of the amplified reception signal. Is done.
【００１１】２つの移相器７−１、７−２の出力は、加
算器８で合成され、図示しない受信チャネルコーデック
へ送出されるとともに、受信ウエイト制御部３に与えら
れる。The outputs of the two phase shifters 7-1 and 7-2 are combined by an adder 8, sent to a reception channel codec (not shown), and supplied to a reception weight control unit 3.
【００１２】受信ウエイト制御部３は、加算器８の出力
に基づき増幅器６−１、６−２の利得を制御し、移相器
７−１、７−２の進遅位相量を制御する。The reception weight control unit 3 controls the gains of the amplifiers 6-1 and 6-2 based on the output of the adder 8, and controls the amount of phase advance and delay of the phase shifters 7-1 and 7-2.
【００１３】また、２つの送信処理系は、図示しない送
信チャネルコーデックから送られてくるベースバンド送
信信号を可変増幅する増幅器９−１、９−２と、増幅さ
れたベースバンド送信信号の位相を進遅する移相器１０
−１、１０−２と、移相器１０−１、１０−２の出力を
変調し、無線周波信号へアップコンバートし、増幅して
送受信共用器２−１、２−２を介してアンテナ素子１−
１、１−２へ送出する無線送信部１１−１、１１−２と
で構成される。The two transmission processing systems include amplifiers 9-1 and 9-2 for variably amplifying a baseband transmission signal transmitted from a transmission channel codec (not shown) and a phase of the amplified baseband transmission signal. Phase shifter 10
-1, 10-2 and the outputs of the phase shifters 10-1 and 10-2 are up-converted into radio frequency signals, amplified, and amplified through the duplexers 2-1 and 2-2. 1-
1 and 1-2.
【００１４】そして、送信ウエイト制御部４では、受信
ウエイト制御部３が用いた利得重み付け値及び位相重み
付け値に基づき、増幅器９−１、９−２の利得及び移相
器１０−１、１０−２の進遅位相量を制御する。The transmission weight control section 4 uses the gain weighting value and the phase weighting value used by the reception weight control section 3 to control the gains of the amplifiers 9-1 and 9-2 and the phase shifters 10-1 and 10-. 2 is controlled.
【００１５】以上の構成において、受信ウエイト制御部
３は、受信タイミングにおいて、非希望波（干渉波）が
抑圧され、希望波が最適に受信できるような合成指向性
を実現すべく、加算器８の合成出力から、アンテナ素子
１−１、１−２による各受信処理系の振幅と位相の重み
付け値を算出し、増幅器６−１、６−２に算出した重み
付け値に対応する利得制御値を与えて利得を制御し、移
相器７−１、７−２に算出した重み付け値に対応する位
相制御値を与えて位相の進遅を制御する。このとき、受
信ウエイト制御部３は、同一周波数の干渉波が多数入射
する場合には、それらを相殺するように受信振幅と位相
を制御する。In the above configuration, the reception weight control section 3 controls the adder 8 so as to realize a combined directivity such that an undesired wave (interference wave) is suppressed at the reception timing and the desired wave can be optimally received. From the combined output of the above, the amplitude and phase weights of the respective reception processing systems by the antenna elements 1-1 and 1-2 are calculated, and the gain control values corresponding to the weights calculated for the amplifiers 6-1 and 6-2 are calculated. The phase shifters 7-1 and 7-2 are provided with a phase control value corresponding to the calculated weight value to control the phase advance / delay. At this time, when a large number of interference waves having the same frequency are incident, the reception weight control unit 3 controls the reception amplitude and the phase so as to cancel them.
【００１６】その結果、例えば、図８に示すような合成
指向性が得られる。図８に示すように、複数のアンテナ
素子による合成指向性は、最大値が希望波方向（イ）に
向かい、ヌル（零点）が非希望波（干渉波）方向（ロ）
（ハ）に向くような放射パターンとなっている。As a result, for example, a combined directivity as shown in FIG. 8 is obtained. As shown in FIG. 8, the combined directivity of a plurality of antenna elements has a maximum value in a desired wave direction (A) and a null (zero) in an undesired wave (interference wave) direction (B).
The radiation pattern is suitable for (c).
【００１７】これにより、同一周波数を使用する干渉波
の受信が抑制されるので、基地局では上り回線（希望
波）が最適な状態で受信される。As a result, the reception of interference waves using the same frequency is suppressed, so that the base station receives the uplink (desired wave) in an optimal state.
【００１８】なお、振幅と位相の重み付けを決定するア
ルゴリズムには、公知のものを適宜選択できる。例え
ば、ＳＭＩ法(Sample Matrix Inverse)とＲＬＳ法(Recu
rsiveLeast Square)があり、それぞれ、文献[I.S.Reed,
J.D.Mallett,and L.E.Brennan,"Rapid convergence rat
e in adaptive arrays", IEEET rans.Aerosp.&Electro
n.Syst.,vol.AES-10,no.6, pp.853-863, Nov.1974]及び
文献[J.G.Proakis,"Digital com-munication",pp.643-6
67,McGraw-Hill,Inc,1989]に記載されている。A known algorithm can be appropriately selected as an algorithm for determining the weighting of the amplitude and the phase. For example, the SMI method (Sample Matrix Inverse) and the RLS method (Recu
rsiveLeast Square).
JDMallett, and LEBrennan, "Rapid convergence rat
e in adaptive arrays ", IEEETrans.Aerosp. & Electro
n.Syst., vol. AES-10, no. 6, pp. 853-863, Nov. 1974] and literature [JG Proakis, "Digital com-munication", pp. 643-6
67, McGraw-Hill, Inc, 1989].
【００１９】一方、送信ウエイト制御部４では、送信タ
イミングにおいて、受信時に用いた振幅と位相の重み付
け値をそのまま送信の振幅と位相の重み付け値として用
いて、または、受信時に用いた振幅と位相の重み付け値
から送信時における最適な振幅と位相を推定しそれを送
信時の振幅と位相の重み付け値として用いて、増幅器９
−１、９−２の利得、及び移相器１０−１、１０−２の
進遅位相量を制御する。これにより、図８の示すような
合成指向性が形成され、送信信号が、干渉波の到来方向
を避けた方向へ無線送信されるので、移動端末では良好
な受信状態で下り回線を無線受信できることになる。On the other hand, at the transmission timing, the transmission weight control unit 4 uses the amplitude and phase weights used during reception as the transmission amplitude and phase weights as they are, or uses the amplitude and phase weights used during reception. The optimum amplitude and phase at the time of transmission are estimated from the weighting values, and the estimated amplitude and phase are used as the weighting values of the amplitude and phase at the time of transmission, and the amplifier 9 is used.
-1 and 9-2, and the phase shift amounts of the phase shifters 10-1 and 10-2 are controlled. As a result, the combined directivity as shown in FIG. 8 is formed, and the transmission signal is wirelessly transmitted in a direction avoiding the arrival direction of the interference wave, so that the mobile terminal can wirelessly receive the downlink in a good reception state. become.
【００２０】[0020]
【発明が解決しようとする課題】しかし、上述したアダ
プティブアレー通信方式では、送信振幅も制御するの
で、振幅が最大でないアンテナ系ができてしまい、結果
としてすべての送信処理系がフルパワーで送信する場合
よりも送信利得が落ちることになる。そのため、送信の
伝送品質が低下する場合がある。However, in the above-described adaptive array communication system, since the transmission amplitude is also controlled, an antenna system having a non-maximum amplitude is created. As a result, all transmission processing systems transmit at full power. The transmission gain will be lower than in the case. Therefore, transmission quality of transmission may be degraded.
【００２１】この問題を回避するために、最大の送信利
得を得るように、位相制御のみ行い、送信振幅は等利得
制御とし、全アンテナ系から最大振幅で送信することが
考えられる。しかし、この方法には、干渉波方向のヌル
が浅くなり、他局に妨害を与えることになる。In order to avoid this problem, it is conceivable that only phase control is performed so that the maximum transmission gain is obtained, the transmission amplitude is set to equal gain control, and transmission is performed from all antenna systems at the maximum amplitude. However, in this method, nulls in the direction of the interference wave become shallow, which causes interference to other stations.
【００２２】本発明は、このような従来の課題を解決す
べく創作されたものであり、周囲からの干渉波の入射状
況に応じて送信振幅の重み付け制御をする場合としない
場合とを切り換えることにより、送信伝送品質の向上が
図れる無線通信装置及びアダプティブアレーによる無線
通信方法を提供することを目的とする。The present invention has been made to solve such a conventional problem, and switches between a case where weighting control of transmission amplitude is performed and a case where weighting control of transmission amplitude is not performed, according to the incident state of an interference wave from the surroundings. Accordingly, it is an object of the present invention to provide a wireless communication device capable of improving transmission transmission quality and a wireless communication method using an adaptive array.
【００２３】[0023]
【課題を解決するための手段】本件出願の請求項１に係
る発明は、アダプティブアレーを構成する複数のアンテ
ナ素子と、前記複数のアンテナ素子による合成指向性の
最大値が希望波方向に向かいヌルが非希望波方向に向く
ように、各アンテナ素子の受信信号の振幅及び位相を重
み付け制御する受信重み付け制御手段と、希望波に対す
る非希望波の干渉度を算出する干渉度算出手段と、前記
受信重み付け制御手段が用いた受信重み付け値と前記干
渉度とに基づき、各アンテナ素子による送信信号の振幅
及び位相を重み付け制御する送信重み付け制御手段と、
を有し、前記送信重み付け制御手段は、前記干渉度が所
定閾値よりも大きいときは、前記受信重み付け値に基づ
いて各アンテナ素子による送信信号の振幅及び位相を制
御し、前記干渉度が所定閾値よりも小さいときは、各ア
ンテナ素子による送信信号の振幅を利得制御最大値に基
づいて制御し、位相を前記受信重み付け値に基づいて制
御するものである無線通信装置である。According to a first aspect of the present invention, there is provided an adaptive array comprising: a plurality of antenna elements constituting an adaptive array; and a maximum value of combined directivity of the plurality of antenna elements is null in a desired wave direction. Receiving weight control means for weighting and controlling the amplitude and phase of the received signal of each antenna element so that the antenna faces the undesired wave direction; interference degree calculating means for calculating the interference degree of the undesired wave with respect to the desired wave; Based on the reception weight value and the interference degree used by the weight control means, transmission weight control means for weighting and controlling the amplitude and phase of the transmission signal by each antenna element,
Wherein the transmission weighting control means controls the amplitude and phase of a transmission signal by each antenna element based on the reception weighting value when the interference degree is larger than a predetermined threshold value, and the interference degree becomes a predetermined threshold value. If it is smaller than the above, the wireless communication apparatus controls the amplitude of the transmission signal from each antenna element based on the maximum gain control value and controls the phase based on the reception weight value.
【００２４】本件出願の請求項２に係る発明は、さら
に、前記各アンテナ素子の受信信号と前記重み付け制御
された各受信信号の合成信号とに基づいて干渉度を算出
する無線通信装置である。[0024] The invention according to claim 2 of the present application is further a radio communication device that calculates an interference degree based on a reception signal of each of the antenna elements and a composite signal of the weighted reception signals.
【００２５】本件出願の請求項３に係る発明は、さら
に、受信信号及び送信信号の重み付け制御を、ベースバ
ンド帯で行う無線通信装置である。[0025] The invention according to claim 3 of the present application is a wireless communication apparatus that further performs weight control of a received signal and a transmitted signal in a baseband band.
【００２６】本件出願の請求項４に係る発明は、アダプ
ティブアレーを構成する複数のアンテナ素子による合成
指向性の最大値が希望波方向に向かいヌルが非希望波方
向に向くように、各アンテナ素子の受信信号の振幅及び
位相を重み付け制御する受信重み付け制御工程と、希望
波に対する非希望波の干渉度を算出する干渉度算出工程
と、前記干渉度が所定閾値よりも大きいときは、前記重
み付け制御工程で用いた受信重み付け値に基づいて各ア
ンテナ素子による送信信号の振幅及び位相を制御し、前
記干渉度が所定閾値よりも小さいときは、各アンテナ素
子による送信信号の振幅を利得制御最大値に基づいて制
御し、位相を前記受信重み付け値に基づいて制御する送
信重み付け制御工程と、を備えるアダプティブアレーに
よる無線通信方法である。The invention according to claim 4 of the present application is arranged so that each antenna element has a maximum combined directivity by a plurality of antenna elements constituting an adaptive array in a desired wave direction and a null in a non-desired wave direction. A weighting control step of weighting the amplitude and phase of the received signal, an interference degree calculating step of calculating an interference degree of the undesired wave with respect to the desired wave, and the weighting control when the interference degree is larger than a predetermined threshold. Control the amplitude and phase of the transmission signal by each antenna element based on the reception weighting value used in the step, when the interference degree is smaller than a predetermined threshold, the amplitude of the transmission signal by each antenna element to the maximum gain control value A transmission weighting control step of controlling the phase based on the reception weighting value, based on the reception weighting value. A.
【００２７】本件出願の請求項５に係る発明は、さら
に、受信信号及び送信信号の重み付け制御を、ベースバ
ンド帯で行うアダプティブアレーによる無線通信方法で
ある。The invention according to claim 5 of the present application is a wireless communication method using an adaptive array in which weighting control of a reception signal and a transmission signal is performed in a baseband band.
【００２８】かかる発明によれば、干渉度に応じて送信
信号の振幅制御を利得制御最大値による場合と重み付け
値による場合と切り換えて実行することができ、周囲か
らの干渉波の入射が少ない場合には送信処理系の能力を
最大限活用できるので、送信振幅を常に重み付け制御す
る場合に比して送信伝送品質を向上させることが可能と
なる。According to the invention, the amplitude control of the transmission signal can be switched between the case of the maximum gain control value and the case of the weight value in accordance with the degree of interference, and can be executed when the interference wave from the surroundings is small. Since the maximum capacity of the transmission processing system can be utilized, transmission transmission quality can be improved as compared with the case where the transmission amplitude is always weighted and controlled.
【００２９】[0029]
【発明の実施の形態】以下、本発明の実施の形態を図面
を参照して説明する。Embodiments of the present invention will be described below with reference to the drawings.
【００３０】図１は、本発明の実施形態の無線通信装置
の構成ブロック図である。図１において、従来例（図
７）と同一構成部分には、同一符号・名称を付してあ
る。以下、本実施形態に係る部分を中心に説明する。本
実施形態の無線通信装置は、図１に示すように、無線受
信部５−１、５−２の出力と加算器８の出力とに基づき
干渉度を算出する干渉度算出部２１と、干渉度算出部２
１の出力（干渉度）と閾値との大小比較を行う比較器２
２と、比較器２２の比較結果を切換制御信号とする２つ
のスイッチ２３、２４とを備える。FIG. 1 is a block diagram showing the configuration of a wireless communication apparatus according to an embodiment of the present invention. 1, the same components as those of the conventional example (FIG. 7) are denoted by the same reference numerals and names. Hereinafter, a description will be given mainly of the portion according to the present embodiment. As shown in FIG. 1, the wireless communication device according to the present embodiment includes an interference degree calculation unit 21 that calculates an interference degree based on the outputs of the wireless reception units 5-1 and 5-2 and the output of the adder 8, Degree calculator 2
Comparator 2 for comparing the output (interference degree) 1 with the threshold value
2 and two switches 23 and 24 that use the comparison result of the comparator 22 as a switching control signal.
【００３１】送信ウエイト制御部４は、受信時に用いた
振幅と位相の重み付け値に基づいた送信信号の振幅及び
位相の重み付け値を出力するが、位相重み付け値はその
まま移相器１０−１、１０−２に送られ、振幅重み付け
値はスイッチ２３、２４の一方の入力端に出力する。The transmission weight controller 4 outputs the amplitude and phase weights of the transmission signal based on the amplitude and phase weights used at the time of reception, but outputs the phase weights as they are. -2, and outputs the amplitude weighting value to one input terminal of the switches 23 and 24.
【００３２】スイッチ２３、２４の他方の入力端には、
利得制御最大値が印加され、比較器２２の比較結果に応
じて、送信ウエイト制御部４からの振幅重み付け値また
は利得制御最大値が増幅器１０−１、１０−２に送られ
る。The other input terminals of the switches 23 and 24 have
The maximum gain control value is applied, and the amplitude weighting value or the maximum gain control value from the transmission weight control unit 4 is sent to the amplifiers 10-1 and 10-2 according to the comparison result of the comparator 22.
【００３３】なお、受信重み付け制御部３と送信重み付
け制御部４と干渉度算出部２１と比較器２２とスイッチ
２３、２４との全体は、ＤＳＰ(Digital Signal Proces
sor)により実現されるものである。The reception weight control unit 3, transmission weight control unit 4, interference degree calculation unit 21, comparator 22, and switches 23 and 24 are all composed of a DSP (Digital Signal Process).
sor).
【００３４】以下、図１〜図５を参照して本実施形態の
無線通信装置の動作を説明する。なお、図２は、送受信
時の合成指向性の一例である。図３は、受信時に用いた
振幅と位相の重み付け値に基づいて送信信号の振幅及び
位相を制御した場合（以降、最大比アダプティブ合成と
呼ぶ。）の送信利得の確率分布図である。図４は、受信
時に用いた位相の重み付け値に基づいて送信信号の位相
を制御し、送信信号の振幅は最大としたとき（以降、等
利得アダプティブ合成と呼ぶ。）の送信利得の確率分布
図である。図５は、実施形態に係る無線通信装置の動作
フローチャートである。The operation of the wireless communication apparatus according to the present embodiment will be described below with reference to FIGS. FIG. 2 is an example of the combined directivity at the time of transmission and reception. FIG. 3 is a probability distribution diagram of the transmission gain when the amplitude and phase of the transmission signal are controlled based on the amplitude and phase weighting values used at the time of reception (hereinafter, referred to as maximum ratio adaptive combining). FIG. 4 is a probability distribution diagram of the transmission gain when the phase of the transmission signal is controlled based on the phase weight value used at the time of reception and the amplitude of the transmission signal is maximized (hereinafter, referred to as equal gain adaptive combining). It is. FIG. 5 is an operation flowchart of the wireless communication device according to the embodiment.
【００３５】前述したように、受信ウエイト制御部３
は、受信タイミングにおいて、非希望波（干渉波）が抑
圧され、希望波が最適に受信できるような合成指向性を
実現すべく、加算器８の合成出力から、アンテナ素子１
−１、１−２による各受信処理系の振幅と位相の重み付
け値を算出し、この値によって、増幅器６−１、６−２
利得、及び移相器７−１、７−２の位相の進遅が制御さ
れる。図２の実線（ａ）は、受信時の合成指向性の一例
であり、図８に示したものと同じである。As described above, the reception weight control unit 3
In order to realize a combined directivity such that an undesired wave (interference wave) is suppressed at the reception timing and the desired wave can be optimally received, the antenna element 1 is output from the combined output of the adder 8.
-1 and 1-2 are weighted for the amplitude and phase of each reception processing system, and the calculated values are used as amplifiers 6-1 and 6-2.
The gain and the phase of the phase shifters 7-1 and 7-2 are controlled. The solid line (a) in FIG. 2 is an example of the combined directivity at the time of reception, and is the same as that shown in FIG.
【００３６】一方、送信ウエイト制御部４も、前述した
ように送信タイミングにおいて、受信時に用いた振幅と
位相の重み付け値をそのまま、または、受信時に用いた
振幅と位相の重み付け値から推定した送信時の振幅と位
相の重み付け値を出力する。そして、位相についての重
み付け値は移相器１０−１、１０−２に送られ、振幅に
ついての重み付け値は、スイッチ２３、２４の一方の入
力端に送られる。On the other hand, the transmission weight control unit 4 also transmits the amplitude and phase weights used during reception at the transmission timing as described above, or at the time of transmission estimated from the amplitude and phase weights used during reception. And outputs the weight values of the amplitude and the phase of. The weight value for the phase is sent to the phase shifters 10-1 and 10-2, and the weight value for the amplitude is sent to one input terminal of the switches 23 and 24.
【００３７】干渉度算出部２１は、無線受信部５−１、
５−２の出力と加算器８の出力とに基づき、希望波に対
する非希望波の割合である干渉度を算出する。具体的に
は、例えば、加算器８の出力が与える合成信号と無線受
信部５−１、５−２の出力が与える入力信号との相関値
から、希望波の電力レベルを算出し、これと入力信号の
平均電力レベルを用いて干渉度を算出する。The interference degree calculator 21 includes a radio receiver 5-1 and
Based on the output of 5-2 and the output of the adder 8, the degree of interference, which is the ratio of the undesired wave to the desired wave, is calculated. Specifically, for example, the power level of the desired wave is calculated from the correlation value between the combined signal provided by the output of the adder 8 and the input signal provided by the outputs of the wireless receivers 5-1 and 5-2. The degree of interference is calculated using the average power level of the input signal.
【００３８】このようにして算出された干渉度と閾値と
の大小関係が比較器２２で決定され、比較結果がスイッ
チ２３、２４の切換制御信号となる。この閾値は、通信
装置が設置される領域の電波の伝播環境等に応じて定め
られる。The magnitude relationship between the interference degree calculated in this way and the threshold value is determined by the comparator 22, and the comparison result is a switching control signal for the switches 23 and 24. This threshold is determined according to the propagation environment of the radio wave in the area where the communication device is installed.
【００３９】送信タイミングにおいて、比較結果が干渉
度＞閾値を示すときは、スイッチ２３、２４は、送信ウ
エイト制御部４が出力する振幅についての重み付け値を
選択し、増幅器９−１、９−２に送る。即ち、増幅器９
−１、９−２の利得は、移相器１０−１、１０−２と同
様に個別に重み付け制御される。At the transmission timing, when the comparison result indicates the degree of interference> the threshold value, the switches 23 and 24 select the weighting values for the amplitude output from the transmission weight control unit 4, and the amplifiers 9-1 and 9-2. Send to That is, the amplifier 9
The gains of -1 and 9-2 are individually weighted and controlled similarly to the phase shifters 10-1 and 10-2.
【００４０】このときの送信時合成指向性は、受信時の
それと同じく図２の実線（ａ）で示す特性である。そし
て、図３に示すように、希望波の送信利得（ｃ）に対
し、非希望波の送信利得（ｄ）は大きく抑圧されたもの
となる。The combined directivity at the time of transmission at this time is the characteristic shown by the solid line (a) in FIG. Then, as shown in FIG. 3, the transmission gain (d) of the non-desired wave is greatly suppressed with respect to the transmission gain (c) of the desired wave.
【００４１】一方、比較結果が干渉度＜閾値を示すとき
は、スイッチ２３、２４は、利得制御最大値を選択し、
増幅器９−１、９−２に送る。即ち、全ての送信系が等
利得で送信信号を増幅することになる。On the other hand, when the comparison result indicates the degree of interference <the threshold value, the switches 23 and 24 select the maximum value of the gain control,
It is sent to the amplifiers 9-1 and 9-2. That is, all transmission systems amplify transmission signals with equal gain.
【００４２】その結果、送信時の合成指向性は、図２の
破線（ｂ）に示すように、干渉波に対するヌルは最大比
合成の特性（ａ）よりも浅くなるが、希望波に対する利
得が特性（ａ）よりも大きい放射パターンとなる。ま
た、図４に示すように、非希望波の送信利得（ｅ）は希
望波の送信利得（ｆ）に近づいたものとなる。As a result, as shown in the broken line (b) of FIG. 2, the combined directivity at the time of transmission is such that the null for the interference wave is shallower than the characteristic (a) of the maximum ratio combining, but the gain for the desired wave is low. The radiation pattern becomes larger than the characteristic (a). In addition, as shown in FIG. 4, the transmission gain (e) of the undesired wave approaches the transmission gain (f) of the desired wave.
【００４３】次に、以上の動作をまとめたものが、図５
のフローチャートである。本実施形態の無線通信装置
は、まず、受信タイミングにおいて、受信時の合成指向
性を求め（ステップＳ１）、干渉度を算出する（ステッ
プ２）。なお、ステップ１とステップ2は並行して行っ
てもよい。次いで、求めた干渉度と閾値との大小比較を
行う（ステップＳ３）。Next, the above operations are summarized in FIG.
It is a flowchart of FIG. First, at the reception timing, the wireless communication device of the present embodiment obtains the combined directivity at the time of reception (step S1), and calculates the degree of interference (step 2). Step 1 and step 2 may be performed in parallel. Next, the magnitude of the obtained interference degree is compared with the threshold value (step S3).
【００４４】そして、送信タイミングにおいて、送信系
の振幅及び位相の重み付け値を求めるとともに、送信信
号の位相の進遅を算出した重み付け値に基づき直接制御
する（ステップＳ４）。一方、送信信号の振幅は、干渉
度と閾値の大小関係に応じて制御する（ステップＳ５〜
Ｓ７）。具体的には、干渉度が閾値よりも大きいときは
求めた重み付け値に基づいて制御し（ステップＳ５、Ｓ
６）、干渉度が閾値よりも小さいときは利得制御最大値
で制御する（ステップＳ５、Ｓ７）。At the transmission timing, the amplitude and phase weights of the transmission system are determined, and the phase of the transmission signal is directly controlled based on the calculated weights (step S4). On the other hand, the amplitude of the transmission signal is controlled according to the magnitude relationship between the degree of interference and the threshold (steps S5 to S5).
S7). Specifically, when the interference degree is larger than the threshold value, control is performed based on the obtained weight value (steps S5 and S5).
6) If the degree of interference is smaller than the threshold value, control is performed at the maximum gain control value (steps S5 and S7).
【００４５】このように本実施形態によれば、干渉度＞
閾値を示すときは、周囲に干渉波を出す移動端末が存在
するので、それらに妨害を与えないように送信する。一
方、干渉度＜閾値を示すときは、周囲に干渉波を出す移
動端末が存在しない場合であるので、その場合には送信
処理系が持つ最大能力の送信利得で送信するようしてあ
る。したがって、送信伝送品質を向上させることができ
る。As described above, according to the present embodiment, the interference degree>
When the threshold value is indicated, there is a mobile terminal that emits an interference wave in the vicinity, so that transmission is performed so as not to interfere with them. On the other hand, when the degree of interference <threshold is indicated, there is no mobile terminal that emits an interference wave in the vicinity, and in that case, transmission is performed with the transmission gain of the maximum capability of the transmission processing system. Therefore, transmission transmission quality can be improved.
【００４６】[0046]
【発明の効果】以上説明したように、本発明によれば、
受信時の情報に基づいて希望波と非希望波戸の干渉度求
め、送信信号の振幅を、干渉度と閾値との大小関係に応
じて利得制御最大値と重み付け値とにより切り換えて制
御できる。したがって、周囲に干渉波を出す無線通信装
置がない場合には、送信処理系の最大能力を活用できる
ので、全ての場合に重み付け値で制御するのに比べて送
信伝送品質を向上させることができ、アダプティブアレ
ー通信方式の実効が図れる。As described above, according to the present invention,
The interference degree between the desired wave and the undesired wave door is obtained based on the information at the time of reception, and the amplitude of the transmission signal can be controlled by switching between the gain control maximum value and the weighting value according to the magnitude relationship between the interference degree and the threshold. Therefore, when there is no wireless communication device that emits an interference wave in the surroundings, the maximum capacity of the transmission processing system can be utilized, so that the transmission transmission quality can be improved as compared with the case where the control is performed with the weight value in all cases. Thus, the adaptive array communication system can be made effective.
【図１】本発明の実施形態の無線通信装置の構成ブロッ
ク図である。FIG. 1 is a configuration block diagram of a wireless communication device according to an embodiment of the present invention.
【図２】送受信時の合成指向性の一例である。FIG. 2 is an example of combined directivity during transmission and reception.
【図３】最大比アダプティブ送信時の送信利得の確率分
布図である。FIG. 3 is a probability distribution diagram of a transmission gain at the time of maximum ratio adaptive transmission.
【図４】等利得アダプティブ送信時の送信利得の確率分
布図である。FIG. 4 is a probability distribution diagram of a transmission gain at the time of equal-gain adaptive transmission.
【図５】実施形態の無線通信装置の動作フローチャート
である。FIG. 5 is an operation flowchart of the wireless communication device of the embodiment.
【図６】ＰＨＳシステムの構成図である。FIG. 6 is a configuration diagram of a PHS system.
【図７】アダプティブアレーを備える従来の無線通信装
置の構成ブロック図である。FIG. 7 is a block diagram illustrating a configuration of a conventional wireless communication device including an adaptive array.
【図８】従来の無線通信装置の送受信時の合成指向性の
一例である。FIG. 8 is an example of combined directivity at the time of transmission and reception of a conventional wireless communication device.
１−１、１−２ アダプティブアレーを構成するアンテ
ナ素子 ２−１、２−２ 送受共用器 ３ 受信ウエイト制御部 ４ 送信ウエイト制御部 ５−１、５−２ 無線受信部 ６−１、６−２ 増幅器 ７−１、７−２ 移相器 ８ 加算器 ９−１、９−２ 増幅器 １０−１、１０−２ 移相器 １１−１、１１−２ 無線送信部 ２１ 干渉度算出部 ２２ 比較器 ２３、２４ スイッチ1-1, 1-2 Antenna elements constituting an adaptive array 2-1, 2-2 Duplexer 3 Receive weight control unit 4 Transmission weight control unit 5-1, 5-2 Wireless receiving unit 6-1, 6 2 Amplifier 7-1, 7-2 Phase shifter 8 Adder 9-1, 9-2 Amplifier 10-1, 10-2 Phase shifter 11-1, 11-2 Wireless transmission section 21 Interference degree calculation section 22 Comparison Container 23, 24 Switch
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 5J021 AA05 AA06 CA06 DB02 DB03 EA04 FA14 FA15 FA16 FA17 FA20 FA31 FA32 GA02 HA05 HA10 5K059 CC03 CC04 DD32 DD35 5K067 AA03 AA23 CC04 CC24 EE02 EE10 HH21 KK02 ──────────────────────────────────────────────────の Continued on the front page F term (reference) 5J021 AA05 AA06 CA06 DB02 DB03 EA04 FA14 FA15 FA16 FA17 FA20 FA31 FA32 GA02 HA05 HA10 5K059 CC03 CC04 DD32 DD35 5K067 AA03 AA23 CC04 CC24 EE02 EE10 HH21 KK02
Claims (5)
ンテナ素子と、 前記複数のアンテナ素子による合成指向性の最大値が希
望波方向に向かいヌルが非希望波方向に向くように、各
アンテナ素子の受信信号の振幅及び位相を重み付け制御
する受信重み付け制御手段と、 希望波に対する非希望波の干渉度を算出する干渉度算出
手段と、 前記受信重み付け制御手段が用いた受信重み付け値と前
記干渉度とに基づき、各アンテナ素子による送信信号の
振幅及び位相を重み付け制御する送信重み付け制御手段
と、を有し、 前記送信重み付け制御手段は、 前記干渉度が所定閾値よりも大きいときは、前記受信重
み付け値に基づいて各アンテナ素子による送信信号の振
幅及び位相を制御し、前記干渉度が所定閾値よりも小さ
いときは、各アンテナ素子による送信信号の振幅を利得
制御最大値に基づいて制御し、位相を前記受信重み付け
値に基づいて制御するものであることを特徴とする無線
通信装置。A plurality of antenna elements constituting an adaptive array, and reception of each antenna element such that the maximum value of the combined directivity of the plurality of antenna elements is directed to a desired wave direction and null is directed to an undesired wave direction. Reception weight control means for weighting and controlling the amplitude and phase of the signal; interference degree calculation means for calculating the interference degree of the undesired wave with respect to the desired wave; and a reception weight value and the interference degree used by the reception weight control means. Transmission weight control means for weighting and controlling the amplitude and phase of the transmission signal by each antenna element, wherein the transmission weight control means sets the reception weight value to the reception weight value when the interference degree is larger than a predetermined threshold value. Controlling the amplitude and phase of the transmission signal by each antenna element on the basis of each antenna element when the degree of interference is smaller than a predetermined threshold. Wireless communication device, characterized in that by the amplitude of the transmission signal is controlled on the basis of a gain control maximum value, and controls on the basis of the phase on the reception weighting value.
と前記重み付け制御された各受信信号の合成信号とに基
づいて干渉度を算出するものであることを特徴とする無
線通信装置。2. The wireless communication apparatus according to claim 1, wherein the interference degree calculating means calculates an interference degree based on a reception signal of each of the antenna elements and a combined signal of the weighted reception signals. A wireless communication device for calculating.
あって、 前記受信信号及び送信信号の重み付け制御は、ベースバ
ンド帯で行うことを特徴とする無線通信装置。3. The wireless communication device according to claim 1, wherein the weighting control of the reception signal and the transmission signal is performed in a baseband.
ンテナ素子による合成指向性の最大値が希望波方向に向
かいヌルが非希望波方向に向くように、各アンテナ素子
の受信信号の振幅及び位相を重み付け制御する受信重み
付け制御工程と、 希望波に対する非希望波の干渉度を算出する干渉度算出
工程と、 前記干渉度が所定閾値よりも大きいときは、前記重み付
け制御工程で用いた受信重み付け値に基づいて各アンテ
ナ素子による送信信号の振幅及び位相を制御し、前記干
渉度が所定閾値よりも小さいときは、各アンテナ素子に
よる送信信号の振幅を利得制御最大値に基づいて制御
し、位相を前記受信重み付け値に基づいて制御する送信
重み付け制御工程と、 を備えることを特徴とするアダプティブアレーによる無
線通信方法。4. A method for weighting the amplitude and phase of a reception signal of each antenna element such that the maximum value of the combined directivity of a plurality of antenna elements constituting an adaptive array is directed to a desired wave direction and null is directed to an undesired wave direction. A receiving weight control step of controlling, an interference degree calculating step of calculating an interference degree of a non-desired wave with respect to a desired wave, and, when the interference degree is larger than a predetermined threshold, based on a reception weight value used in the weighting control step. Control the amplitude and phase of the transmission signal by each antenna element, and when the degree of interference is smaller than a predetermined threshold, control the amplitude of the transmission signal by each antenna element based on the maximum value of the gain control, and control the phase by the reception. A transmission weight control step of performing control based on a weight value, a wireless communication method using an adaptive array.
る無線通信方法であって、 前記受信信号及び送信信号の重み付け制御は、ベースバ
ンド帯で行うことを特徴とするアダプティブアレーによ
る無線通信方法。5. The wireless communication method using an adaptive array according to claim 4, wherein the weighting control of the reception signal and the transmission signal is performed in a baseband band.
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