JPH02237325A - In-phase synthesis space diversity receiver - Google Patents

Abstract

PURPOSE:To attain in-phase (phase difference is 0 deg.) control even when the tracing speed of phase control is in any input phase relation independently of input phase difference by applying orthogonal detection to two reception input signals and applying directly its detected voltage to an quadrature modulator of a vector synthesis type endless phase shifter. CONSTITUTION:A phase shift deltapsi of an endless phase shifter is made the same as a reception input phase difference DELTAtheta and a phase shift direction making the phase difference between received inputs zero is selected, then the endless phase shifter is always controlled to apply in-phase synthesis. That is, an output of a phase shift detector 12 producing a voltage of VmcosDELTAtheta with respect to the phase difference of DELTAtheta is fed to a multiplier requiring a control voltage of VacosDELTApsi with respect to the phase shift DELTApsi. Moreover, an output of a 2nd phase shift detector 14 producing a voltage of VmsinDELTAtheta with respect to the phase difference of DELTAtheta is fed to a multiplier requiring a control voltage of VasinDELTApsi with respect to the phase shift DELTApsi. Thus, in-phase control is quickly attained to an input of any phase relation.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は位相比較器において２つの受信入力信号の位相
差を検出し、その出力から受信人力信号間での位相の進
み又は遅れを判定して受信入力信号の位相差を制御する
同相合成スペースダイバーシティ受信装置に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention detects the phase difference between two received input signals in a phase comparator, and determines the phase lead or lag between the received human input signals from the output thereof. The present invention relates to an in-phase synthesis space diversity receiver that controls the phase difference of received input signals.

〔従来の技術〕[Conventional technology]

従来の受信装置における同相合成スペースダイバーシテ
ィ受信装置の実施例のブロック図を第３図に示す。同図
において、受信人力信号Ｓ２はベクトル合成形無限移相
器（ＥＰＳ）１によって位相が制御され、電力合成器７
において受信入力信号Ｓ１と常に同相で合成が行われる
。この合成信号は図外の復調器（ＤＥＭ）へ送られてベ
ースハンド信号に復調される。A block diagram of an embodiment of an in-phase combining space diversity receiver in a conventional receiver is shown in FIG. In the figure, the phase of the received human power signal S2 is controlled by a vector composite infinite phase shifter (EPS) 1, and a power combiner 7
, the signal is always combined in phase with the received input signal S1. This composite signal is sent to a demodulator (DEM) (not shown) and demodulated into a base hand signal.

無限移相器１は、電力分配器２，電力合成器３９０゜移
相器４．乗算器５，６で構成される。The infinite phase shifter 1 includes a power divider 2, a power combiner 390° phase shifter 4. It consists of multipliers 5 and 6.

一方、前記電力合成器７への２つの入力信号はともに分
岐されて夫々バンドバスフィルタ８，９及び自動利得制
御（ＡＧＣ）増幅器１０．１１を通った後、位相比較器
１２に入力される。前記ハンドパスフィルタ８．９は変
調波の中心周波数付近の成分のみを取り出すための狭帯
域ハンドバスフィルタ（ＢＰＦ）であり、自動利得制御
増幅器１０，１１ば信号レヘルを常に一定に保つように
機能する。また、一方の信号、ここでは受信入力信号Ｓ
２側のみ９０゜位相を変化させるための９０゜移相器１
３を通している。Meanwhile, the two input signals to the power combiner 7 are branched together, passed through bandpass filters 8 and 9 and automatic gain control (AGC) amplifiers 10 and 11, respectively, and then input to a phase comparator 12. The handpass filter 8.9 is a narrowband handpass filter (BPF) for extracting only the components near the center frequency of the modulated wave, and the automatic gain control amplifiers 10 and 11 function to always keep the signal level constant. do. Also, one signal, here the received input signal S
90° phase shifter 1 for changing the phase by 90° only on the 2nd side
I am passing through 3.

そして、位相比較器１２は第４図（ａ）のように、比較
する２つの信号が同相のときにその出力が０となるよう
な特性を有しており、この特性で前記２つの信号を比較
する。この位相比較器１２の出力電圧Ｖ。は、夫々異な
る値に固定したしきい値電圧を持つ２つの電圧比較器２
０及び２１に入力され、第３図（ｂ）及び（Ｃ）のよう
な一方の入力位相の遅れの検出信号と一方の入力位相の
進みの検出信号とを得ている。この位相情報をもつ２つ
の制御信号により無限位相器制御回路１９は前記の無限
移相器１で受信入力信号Ｓ２の位相を制御して同相合成
を行っている。As shown in FIG. 4(a), the phase comparator 12 has a characteristic such that its output is 0 when the two signals to be compared are in phase, and with this characteristic, the two signals are compare. The output voltage V of this phase comparator 12. are two voltage comparators 2 each having a threshold voltage fixed to a different value.
0 and 21, and a detection signal indicating a delay in one input phase and a detection signal indicating a lead in one input phase are obtained as shown in FIGS. 3(b) and 3(C). Using the two control signals having this phase information, the infinite phase shifter control circuit 19 controls the phase of the received input signal S2 in the infinite phase shifter 1 to perform in-phase synthesis.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

上述した従来の同相合成スペースダイバーシティ受信装
置では、第４図に示したように位相比較器１２の出力電
圧■。がＶ，＞Ｖｏ＞Ｖ２のときには、２つの電圧比較
器２０及び２Ｉで位相の進み及び遅れを全く検出しない
位相差の範囲が存在し、位相制御を行わない不惑帯とな
っている。これは同相合成時において不感帯を設けない
と、受信入力信号Ｓ２は常に無限移相器１により位相制
御されるため、その合成波に対して雑音の要因となり、
或いは位相のゆらぎとして受信装置全体の誤り率特性を
劣化させる要因となる場合があるためであり、不感帯を
設けることによってこれを防止していた。In the conventional in-phase synthesis space diversity receiver described above, the output voltage of the phase comparator 12, as shown in FIG. When V,>Vo>V2, there is a range of phase difference in which the two voltage comparators 20 and 2I do not detect any phase lead or lag, and this is a zone where no phase control is performed. This is because if a dead band is not provided during in-phase synthesis, the received input signal S2 will always be phase-controlled by the infinite phase shifter 1, which will cause noise to the synthesized wave.
Alternatively, this is because phase fluctuations may cause deterioration of the error rate characteristics of the entire receiving apparatus, and this has been prevented by providing a dead zone.

しかし、従来のように位相比較器１２の出力電圧に対し
て２つの電圧比較器２０および２１の固定の不感帯を設
定するだけの方式では２つの受信入力信号が同相のとき
のみならず逆相のときにもその２つの受信入力信号の位
相差において不感帯が生じてしまう。このため、何らか
のきっかけで受信入力の位相関係が逆相付近の不感帯へ
飛び込むと逆相合成状態のまま位相制御が止まってしま
うという問題があった。However, in the conventional method of simply setting a fixed dead zone of the two voltage comparators 20 and 21 with respect to the output voltage of the phase comparator 12, the two received input signals are not only in phase but also in opposite phase. Sometimes, a dead zone occurs due to the phase difference between the two received input signals. For this reason, there is a problem in that if the phase relationship of the received input jumps into a dead zone near the opposite phase for some reason, the phase control will stop while remaining in the opposite phase combination state.

また、従来では受信入力の位相の遅れ及び進みを判定し
、無限移相器の位相の回転方向を制御して一定速度で位
相差がＯとなる方向へ追従させていたため、人力位相差
が大きくなればなるほど位相差がＯ（同相状態）となる
までに要する時間が長くなっていた。In addition, in the past, the delay and lead of the phase of the received input was determined, and the rotation direction of the phase of the infinite phase shifter was controlled to follow the phase difference at a constant speed in the direction of O, so the manual phase difference was large. The longer the phase difference becomes, the longer it takes for the phase difference to reach O (in-phase state).

本発明はどのような位相関係の入力でも速やかに同相制
御を可能とした同相合成スペースダイバーシティ受信装
置を提供することを目的とする。SUMMARY OF THE INVENTION An object of the present invention is to provide an in-phase synthesis space diversity receiver that can quickly perform in-phase control for inputs with any phase relationship.

〔課題を解決するための手段〕[Means to solve the problem]

本発明の同相合成スペースダイバーシティ受信装置は、
２つのアンテナから夫々入力される２つの受信入力信号
の位相を比較する位相比較器と、この位相比較器とはそ
の入力の位相差に対する位相比較特性が９０゜異なる第
２の位相比較器と、これらの位相比較器の出力に基づい
て前記２つの受信入力信号の位相差を制御するベクトル
合成形無限移相器とを備えており、各位相比較器の出力
を、前記ベクトル合成形無限移相器に設けた位相平面上
で直交する信号の振幅を制御する２つの乗算器に夫々加
えて前記位相差制御を行うように構成している。The in-phase synthesis space diversity receiving device of the present invention includes:
a phase comparator that compares the phases of two received input signals respectively input from two antennas; a second phase comparator whose phase comparison characteristics with respect to the phase difference of the inputs differ by 90 degrees from the phase comparator; and a vector composite infinite phase shifter that controls the phase difference between the two received input signals based on the outputs of these phase comparators, and the output of each phase comparator is controlled by the vector composite infinite phase shifter. The phase difference control is performed in addition to two multipliers that control the amplitudes of signals that are orthogonal on a phase plane provided in the device.

〔作用〕[Effect]

上述した構成では、位相比較器と第２の位相比較器の各
出力で直交検波を行っており、その９０゜位相の異なる
出力電圧をベクトル合成形無限移相器の乗算器に加える
ことで、無限移相器における移相量が制御できる。In the above configuration, quadrature detection is performed on each output of the phase comparator and the second phase comparator, and by applying the output voltages with a 90° phase difference to the multiplier of the vector composition infinite phase shifter, The amount of phase shift in the infinite phase shifter can be controlled.

〔実施例〕〔Example〕

次に、本発明を図面を参照して説明する。 Next, the present invention will be explained with reference to the drawings.

第１図は本発明の一実施例のブロック図であり、第３図
に示した従来装置と同一部分には同一符号を附し、その
詳細な説明は省略している。FIG. 1 is a block diagram of an embodiment of the present invention, and the same parts as those of the conventional device shown in FIG. 3 are given the same reference numerals, and detailed explanation thereof is omitted.

この装置では、無限移相器制御回路１９と２つの電圧比
較器２０．２１を除去する代わりに、位相比較器１２と
は位相差が９０゜異なる２つの信号を比較する第２の位
相比較器１４を設けている。In this device, instead of removing the infinite phase shifter control circuit 19 and the two voltage comparators 20 and 21, a second phase comparator is used to compare two signals having a phase difference of 90° from the phase comparator 12. There are 14.

また、これら２つの位相比較器１２．１４の出力を平滑
化し入力位相の急峻な変化に対して不必要に追従するこ
とを防ぐための低域フィルタ１５，１６と、ベクトル合
成形無限移相器１の乗算器５，６の制御電圧に対する振
幅変化量を線形にずるためのリニアライザ１７，１８を
設けている。Additionally, low-pass filters 15 and 16 are provided to smooth the outputs of these two phase comparators 12 and 14 to prevent unnecessary tracking of steep changes in the input phase, and a vector composite infinite phase shifter. Linearizers 17 and 18 are provided to linearly shift the amount of amplitude change with respect to the control voltage of the multipliers 5 and 6.

このように構成することにより、位相比較器１２．１４
の出力は、夫々ヘクトル合成形無限移相器１を構成して
いる位相平面上で直交する信号の振幅を制御する２つの
乗算器５．６の制御電圧として加えられ、直交検波器の
出力を直交変調器の制御入力とする形で移相変調をかけ
てヘクトル合成形無限移相器の移相量を制御している。With this configuration, the phase comparators 12 and 14
The outputs of are added as control voltages of two multipliers 5.6 that control the amplitudes of signals that are orthogonal on the phase plane, respectively constituting the hector composite infinite phase shifter 1, and the outputs of the quadrature detectors are The amount of phase shift of the Hector composite infinite phase shifter is controlled by applying phase shift modulation to the control input of the quadrature modulator.

即ち、第２図（ａ）のように位相比較器１２の位相比較
特性に対して第２の位相比較器１４の位相比較特性は９
０゜異なっており、また、同図（ｂ）のように直交する
２つのベク１〜ルＡ　ｃｏｓΔψ及びＡ　ｓｉｎΔψの
合成によって無限移相器１の入力信号の位相をΔψだけ
シフトすることができることから、ベクトル合成形無限
移相器１の２つの乗算器５．６で入力信号の振幅を制御
電圧に対してリニアに制御できるようにすれば、同図（
Ｃ）に示したようなリニアライザ１７，１Ｂを設けた乗
算器の制御電圧に対する移相特性が得られる。That is, as shown in FIG. 2(a), the phase comparison characteristic of the second phase comparator 14 is 9 compared to the phase comparison characteristic of the phase comparator 12.
0° and that the phase of the input signal of the infinite phase shifter 1 can be shifted by Δψ by combining two orthogonal vectors A cos Δψ and A sin Δψ as shown in FIG. From this, if the two multipliers 5 and 6 of the vector composite infinite phase shifter 1 can control the amplitude of the input signal linearly with respect to the control voltage, the same figure (
A phase shift characteristic with respect to the control voltage of a multiplier provided with linearizers 17 and 1B as shown in C) can be obtained.

そこで、受信入力位相差Δθに対して無限移相器の移相
量Δψを同じにし、かつ受信入力間の位相差を０とする
ような移相方向を選んでやれば、無限移相器は常に同相
合成を行うように制御されることとなる。つまり、位相
差Δθに対してＶｍｃｏｓΔθなる電圧を生じる移相検
波器１２の出力を移相量Δψに対してＶａｃｏｓΔψな
る制御電圧が必要な乗算器に加え、位相差Δθに対して
ＶｍｓｉｎΔθなる電圧を生じる第２の位相検波器１４
の出力を移相量Δψに対してＶａｓｉｎΔψなる制御電
圧が必要な乗算器に加えることにより、移相量Δψ一Δ
θとなるように無限移相器が制御されることになる。Therefore, if we make the phase shift amount Δψ of the infinite phase shifter the same as the receiving input phase difference Δθ, and select a phase shift direction that makes the phase difference between the receiving inputs 0, the infinite phase shifter will become It is controlled to always perform in-phase synthesis. In other words, the output of the phase shift detector 12 that generates a voltage of VmcosΔθ with respect to the phase difference Δθ is added to a multiplier that requires a control voltage of VacosΔψ with respect to the phase shift amount Δψ, and a voltage of VmsinΔθ with respect to the phase difference Δθ is applied. The resulting second phase detector 14
By adding the output of
The infinite phase shifter will be controlled so that θ.

〔発明の効果〕〔Effect of the invention〕

以上説明したように本発明は、２つの受信入力信号を直
交検波し、その検波電圧をベクトル合成形無限移相器の
直交変調器に直接加えることによって、位相制御の追従
速度が入力位相差に無関係でどのような入力の位相関係
であっても同相（位相差が０）になるような制御を行う
ことができる効果がある。As explained above, the present invention quadrature-detects two received input signals and directly applies the detected voltage to the quadrature modulator of the vector composite infinite phase shifter. There is an effect that control can be performed so that regardless of the phase relationship of unrelated inputs, they are in the same phase (phase difference is 0).

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本発明の一実施例のブロック図、第２図（ａ）
は位相比較器の位相比較特性図、同図（ｂ）はベクトル
合成形無限移相器の原理を示す図、同図（ｃ）はベクト
ル合成形無限移相器の制御電圧に対する移相持性を示す
図、第３図は従来の受信装置のブロック図、第４図（ａ
）乃至（ｃ）は第３図の装置における位相比較特性とそ
の出力特性を示す図である。 １・・・ベクトル合成形無限移相器、２・・・電力分配
器、３・・・電力合成器、４・・・９０゜移相器、５，
６・・・乗算器、７・・・電力合成器、８，９・・・狭
帯域バンドパスフィルタ、１０．１１・・・乗算自動利
得制御増幅器、１２・・・移相比較器、１３・・・９０
゜移相器、１４・・・第２　位相比較ｈ、１　５　．　
　１　６・・・ローパスフィルタ、１７．１８・・・リ
ニアライザ、１９・・・無限移相器制−１６５一Fig. 1 is a block diagram of an embodiment of the present invention, Fig. 2(a)
is a phase comparison characteristic diagram of a phase comparator, (b) is a diagram showing the principle of a vector composite infinite phase shifter, and (c) is a diagram showing the phase shift characteristics of a vector composite infinite phase shifter with respect to control voltage. 3 is a block diagram of a conventional receiving device, and FIG. 4 (a
) to (c) are diagrams showing phase comparison characteristics and output characteristics in the device of FIG. 3. 1... Vector composite infinite phase shifter, 2... Power divider, 3... Power combiner, 4... 90° phase shifter, 5,
6... Multiplier, 7... Power combiner, 8, 9... Narrowband band pass filter, 10.11... Multiplying automatic gain control amplifier, 12... Phase shift comparator, 13.・・90
゜Phase shifter, 14...Second phase comparison h, 1 5.
1 6...Low pass filter, 17.18...Linearizer, 19...Infinite phase shifter control-165-1

Claims (1)

【特許請求の範囲】[Claims] １、２つのアンテナから夫々入力される２つの受信入力
信号の位相を比較する位相比較器と、この位相比較器と
はその入力の位相差に対する位相比較特性が９０°異な
る第２の位相比較器と、これらの位相比較器の出力に基
づいて前記２つの受信入力信号の位相差を制御するベク
トル合成形無限移相器とを備え、前記各位相比較器の出
力を、前記ベクトル合成形無限移相器に設けた位相平面
上で直交する信号の振幅を制御する２つの乗算器に夫々
加えて前記位相差制御を行うように構成したことを特徴
とする同相合成スペースダイバーシティ受信装置。1. A phase comparator that compares the phases of two received input signals input from two antennas, and a second phase comparator whose phase comparison characteristics with respect to the phase difference of the inputs differ by 90 degrees from this phase comparator. and a vector composite infinite phase shifter that controls the phase difference between the two received input signals based on the outputs of these phase comparators, and the output of each of the phase comparators is controlled by the vector composite infinite phase shifter. An in-phase synthesis space diversity receiving device characterized in that the in-phase synthesis space diversity receiving device is configured to perform the phase difference control in addition to two multipliers that control the amplitudes of signals that are orthogonal on a phase plane provided in a phase shifter.