JPS61131636A - Polarized wave multiplex radio communication system - Google Patents
Polarized wave multiplex radio communication systemInfo
- Publication number
- JPS61131636A JPS61131636A JP25379484A JP25379484A JPS61131636A JP S61131636 A JPS61131636 A JP S61131636A JP 25379484 A JP25379484 A JP 25379484A JP 25379484 A JP25379484 A JP 25379484A JP S61131636 A JPS61131636 A JP S61131636A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- communication system
- local oscillator
- demodulating
- output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B14/00—Transmission systems not characterised by the medium used for transmission
- H04B14/002—Transmission systems not characterised by the medium used for transmission characterised by the use of a carrier modulation
- H04B14/008—Polarisation modulation
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、マイクロ波ディジタル通信の周波数利用効率
を高める直交振幅変調（ＱＡＭ）通信方式などの偏波多
重無線通信方式に関する。特に、交差偏波識別度補償回
路を受信側装置にもつ偏波多重無線通信方式において、
信号送信時に周波数オフセットをかける手段を備えた送
信装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a polarization multiplexing wireless communication system, such as a quadrature amplitude modulation (QAM) communication system, which improves the frequency utilization efficiency of microwave digital communication. In particular, in polarization multiplexing wireless communication systems that have a cross-polarization discrimination compensation circuit in the receiving device,
The present invention relates to a transmitting device including means for applying a frequency offset during signal transmission.
マイクロ波ディジタル通信では、直交した２偏波を用い
る直交偏波通信方式が注目されている。In microwave digital communications, orthogonal polarization communication systems that use two orthogonal polarized waves are attracting attention.
この直交偏波共用による周波数の有効利用のためには、
アンテナ系の交差偏波特性を良好にすること、フェージ
ングによる交差偏波識別度（ＣｒｏｓｓＰｏｌａｒｉｚ
ａｔｉｏｎ Ｄｉｓｃｒｉｍｉｎａｔｉｏｎ ： Ｘ
Ｐ Ｄ）の劣化が著しい場合には、その補償を行うこと
が必要である。電波伝播路で発生する交差偏波識別度の
劣化、すなわち交差偏波干渉は、フェージング時の異方
性移相（ＤＰＳ）と異方性減衰（ＤＡ）とに起因してい
る。そのため、高い交差偏波識別度が要求されるシステ
ムでは、その劣化を補償する交差偏波識別度補償回路（
ＸＰＩＣ）が必要である。In order to effectively utilize frequencies by sharing this orthogonal polarization,
Improving cross-polarization characteristics of the antenna system and improving cross-polarization discrimination (CrossPolariz) by fading
ation Discrimination: X
If the deterioration of PD) is significant, it is necessary to compensate for it. Deterioration of cross-polarization discrimination, that is, cross-polarization interference, occurring in a radio wave propagation path is caused by anisotropic phase shift (DPS) and anisotropic attenuation (DA) during fading. Therefore, in systems that require high cross-polarization discrimination, a cross-polarization discrimination compensation circuit (
XPIC) is required.
この交差偏波識別度補償回路は、受信側装置で干渉骨に
相当する誤差信号とデータ信号との相関をとり、可変結
合器を制御し交差偏波干渉を除去する方式である。この
交差偏波識別度補償回路の動作が安定に行われるには、
再生キャリア信号の位相差が変化したことにより誤差信
号の位相が変化した場合に、データ信号と正しい相関が
とれるように誤差信号の補正を行う必要がある。そのた
めには、各再生キャリア信号の位相関係を検出する手段
を備え、再生キャリア信号の位相差に対応して補正され
た誤差信号を得て、主偏波側の復調器と異偏波側の復調
器との各々の再生キャリア信号がいかなる位相関係にあ
っても、正しく相関がとれる手段を備える必要がある（
「交差偏波干渉除去回路」特開昭５９−１１２７３９号
公報参照）。This cross-polarized wave discrimination compensating circuit is a system in which a reception side device correlates an error signal corresponding to an interference bone with a data signal, controls a variable coupler, and removes cross-polarized wave interference. In order for this cross-polarization discrimination compensation circuit to operate stably,
When the phase of the error signal changes due to a change in the phase difference of the reproduced carrier signal, it is necessary to correct the error signal so that it has a correct correlation with the data signal. To do this, it is necessary to provide a means for detecting the phase relationship of each reproduced carrier signal, obtain an error signal corrected according to the phase difference of the reproduced carrier signals, and then It is necessary to provide a means for correctly correlating regardless of the phase relationship between each reproduced carrier signal and the demodulator (
(Refer to Japanese Patent Laid-Open No. 59-112739, "Cross Polarization Interference Elimination Circuit").
ところが、このような従来の交差偏波干渉除去回路は、
直交する２偏波に対応する二つの復調器出力の位相関係
を検出して、その結果により得られた誤差信号を補正す
る手段により、再生キャリア信号の位相差がどのように
変化しても常に正常動作を行わせる方法である。したが
って、二つの復調器出力から位相検出する手段の位相差
検出能力に依存し、たとえば位相差が０°、９０’ 、
１８０゜あるいは２７０°のごく近傍では判定不能に陥
ることがある。However, such conventional cross-polarization interference cancellation circuits
By detecting the phase relationship between two demodulator outputs corresponding to two orthogonal polarized waves and correcting the error signal obtained as a result, the signal is always maintained no matter how the phase difference of the reproduced carrier signal changes. This is a method that allows normal operation to occur. Therefore, it depends on the phase difference detection ability of the means for detecting the phase from the two demodulator outputs. For example, if the phase difference is 0°, 90',
In the very vicinity of 180° or 270°, determination may become impossible.
さらに、たとえばフェージングによる遅延時間の変化に
より受信信号に位相回転が生じ、しがもそれがゆらぎな
がら変動する場合には、位相検出の判定不能領域が長時
間（数秒）に及ぶことがある。Furthermore, if a phase rotation occurs in the received signal due to a change in delay time due to fading, for example, and if it fluctuates in a fluctuating manner, the phase detection indeterminable region may extend for a long time (several seconds).
本発明は、このような従来の問題点に着目してなされた
もので、受信側の交差偏波干渉除去回路において、再生
キャリア信号の位相差が変化したことにより誤差信号の
位相が回転する場合に、その位相差゛判定が不能になる
時間がほとんど無視できるようにする偏波多重無線通信
方式を提供することを目的とする。The present invention has been made by focusing on such conventional problems, and the present invention is made by focusing on the problem of the conventional technology. Another object of the present invention is to provide a polarization multiplexing wireless communication system that makes it possible to almost ignore the time during which phase difference determination becomes impossible.
本発明は、両偏波の送信装置の局部発振器に周波数オフ
セットをかけることを特徴とする。The present invention is characterized in that a frequency offset is applied to the local oscillator of the transmitter for both polarizations.
すなわち、本発明第一の発明は、交差する偏波に別の情
報を変調した電波信号を送信する手段を含む送信装置と
、この電波信号を受信して偏波毎に復調する複数の復調
手段と、この復調手段の出力により交差偏波干渉を除去
する手段とを含む受信装置とを備えた偏波多重無線通信
方式において、上記送信装置は、交差する偏波について
互いにその搬送波周波数が僅かに相違する構成であるこ
とを特徴とする。That is, the first invention of the present invention includes a transmitting device including means for transmitting a radio wave signal in which different information is modulated on intersecting polarized waves, and a plurality of demodulating means for receiving this radio wave signal and demodulating it for each polarized wave. and a receiving device including means for removing cross-polarized interference using the output of the demodulating means, the transmitting device is arranged such that the carrier frequencies of the crossed polarized waves are slightly different from each other. They are characterized by different configurations.
この搬送波周波数の僅かな相違は、復調器キャプチャレ
ンジの範囲内であることが良い。This slight difference in carrier frequency may be within the demodulator capture range.
本発明第二の発明は、交差する偏波に別の情報を変調し
た電波信号を送信する手段を含む送信装置と、この電波
信号を受信して偏波毎に復調する複数の復調手段と、こ
の復調手段の出力により交差偏波干渉を除去する手段と
を含む受信装置とを備えた偏波多重無線通信方式におい
て、上記送信装置は、その出力周波数が制御信号に応じ
て、復調器キャプチャレンジの範囲内で僅かに変化する
局部発振器と、変調信号入力を検出し、その検出出力を
上記制御信号として上記局部発振器に送出する検出回路
とを備えたことを特徴とする。A second aspect of the present invention is a transmitting device including means for transmitting a radio signal in which different information is modulated on intersecting polarized waves, a plurality of demodulating means for receiving the radio signal and demodulating it for each polarized wave, In the polarization multiplexing wireless communication system, the transmitting device has a polarization multiplexing wireless communication system including a receiving device including means for removing cross-polarization interference by the output of the demodulating device, and the transmitting device has an output frequency that is within the demodulator capture range according to the control signal. The present invention is characterized by comprising a local oscillator that changes slightly within the range of , and a detection circuit that detects a modulation signal input and sends the detected output to the local oscillator as the control signal.
第一の発明は、両偏波の送信装置の局部発振器に、あら
かじめ復調器キャプチャレンジの範囲内で周波数オフセ
ットをかけておくことにより、両偏波間の位相回転が速
くなる。したがって、受信側の位相検出手段は、判定不
能になる時間がほとんど無視できるようになり、交差偏
波干渉除去回路は安定な動作が確立される。The first invention speeds up the phase rotation between the polarized waves by applying a frequency offset to the local oscillators of the transmitting devices for both polarized waves within the demodulator capture range in advance. Therefore, the phase detection means on the receiving side can almost ignore the time during which it cannot make a determination, and stable operation of the cross-polarization interference removal circuit is established.
第二の発明は、両偏波送信装置の一方あるいは両方の変
調入力信号に対応して、その局部発振器の発振周波数を
変化させるもので、両偏波間の周波数オフセントを容易
に得ることができる。The second invention changes the oscillation frequency of the local oscillator in response to the modulated input signal of one or both of the polarized waves transmitting device, and can easily obtain the frequency offset between the two polarized waves.
以下、本発明の実施例方式を図面に基づいて説明する。 DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.
第１図は、本発明第一の発明の一実施例を示すブロック
構成図である。第１図において、入力端子１０．２０に
は変調波（中間周波信号）がそれぞれ入力され、出力端
子１９．２９には送信されるマイクロ波信号がそれぞれ
出力される。入力端子１０．２０と出力端子１９．２９
との間には、それぞれ局部発振器１１．２１の出力を入
力とする周波数変換器１２．２２および増幅器１３．２
３が接続される。FIG. 1 is a block diagram showing an embodiment of the first aspect of the present invention. In FIG. 1, modulated waves (intermediate frequency signals) are input to input terminals 10 and 20, and microwave signals to be transmitted are output to output terminals 19 and 29, respectively. Input terminal 10.20 and output terminal 19.29
Frequency converters 12.22 and amplifiers 13.2 each receive the output of local oscillators 11.21 as inputs.
3 is connected.
局部発振器１１または２１の発振周波数は、あらかじめ
復調器キャプチャレンジの範囲内でオフセットしておく
。たとえば、一方の局部発振器を他方の局部発振器に対
して１００ｋＨｚ程度シフトさせると、位相の９０”回
転に要する時間がオフセ・ソトをかけていないときに約
１秒であったものが、約１０μ秒に速（回転させること
ができる。The oscillation frequency of the local oscillator 11 or 21 is offset in advance within the demodulator capture range. For example, if one local oscillator is shifted by about 100 kHz relative to the other local oscillator, the time required to rotate the phase by 90'', which was approximately 1 second without offset, will be reduced to approximately 10 microseconds. speed (can be rotated).
しかし、周波数オフセントを行う場合に第一の発明では
、変調器のキャリア周波数あるいは送信機の局部発振器
の周波数をあらかじめオフセットしておく方法がとられ
ているが、その調整はかなり煩雑であり、回線保守上あ
るいは装置製造管理上混乱が生じやすい。However, when performing frequency offset, the first invention uses a method in which the carrier frequency of the modulator or the frequency of the local oscillator of the transmitter is offset in advance, but the adjustment is quite complicated and the line Confusion is likely to occur in maintenance or equipment manufacturing management.
そこで、第二の発明は変調信号が送信装置に入力された
ときのみ、周波数オフセットをかける手段を備えること
を特徴とする。したがって、両偏波の送信装置の構成回
路は同一規格でよ（、装置製造管理が極めて容易にする
ことができる。Therefore, the second invention is characterized in that it includes means for applying a frequency offset only when a modulated signal is input to the transmitter. Therefore, since the configuration circuits of the transmitter for both polarizations are of the same standard (device manufacturing management can be extremely simplified).
第２図は、本発明第二の発明の一実施例を説明するブロ
ック構成図である。第１図において、入力端子１０．２
０には変調波（中間周波信号）がそれぞれ入力され、出
力端子１９．２９には送信されるマイクロ波信号がそれ
ぞれ出力される。入力端子１０．２０と出力端子１９．
２９との間には、それぞれ局部発振器１１．２１の出力
を入力とする周波数変換器１２．２２およびその増幅器
１３．２３が接続される。さらに、一方の送信装置には
、入力信号が分岐されて変調信号検出器１４に接続され
、この変調信号検出器１４の出力が局部発振器１１の発
振周波数を制御するように構成されている。FIG. 2 is a block configuration diagram illustrating an embodiment of the second invention. In Figure 1, input terminal 10.2
A modulated wave (intermediate frequency signal) is input to each terminal 0, and a microwave signal to be transmitted is outputted to each output terminal 19 and 29. Input terminal 10.20 and output terminal 19.
Frequency converters 12.22 and their amplifiers 13.23, each receiving the output of the local oscillator 11.21, are connected between the frequency converters 12.29 and 29. Further, one of the transmitting devices is configured such that the input signal is branched and connected to a modulated signal detector 14, and the output of this modulated signal detector 14 controls the oscillation frequency of the local oscillator 11.
変調信号が入力端子１０．２０から入力され、周波数変
換器１２．２２で局部発振器１１．２１の出力と混合さ
れてマイクロ波帯に変換され、増幅器１３．２３で増幅
されて出力端子１９．２９からアンテナ系の各偏波入力
端子に送出される。 −
ここで、本発明第二の発明の特徴とするところは、一方
の送信装置において変調信号検出器１４は変調信号が入
力されているか否かを判定し、変調入力信号がある場合
には、局部発振周波数をオフセットまたはウオブリング
するための制御信号を局部発振器１１に出力するところ
にある。A modulated signal is input from input terminal 10.20, mixed with the output of local oscillator 11.21 by frequency converter 12.22, converted into a microwave band, amplified by amplifier 13.23, and sent to output terminal 19.29. The signal is sent to each polarization input terminal of the antenna system. - Here, the feature of the second invention of the present invention is that the modulated signal detector 14 in one transmitting device determines whether or not a modulated signal is input, and if there is a modulated input signal, A control signal for offsetting or wobbling the local oscillation frequency is output to the local oscillator 11.
したがって、一方の送信装置に変調信号検出器１４およ
びその出力制御信号で発振周波数が制御される局部発振
器１１を備えることにより、容易に周波数オフセットを
かけることができる。Therefore, by providing one transmitter with the modulation signal detector 14 and the local oscillator 11 whose oscillation frequency is controlled by its output control signal, a frequency offset can be easily applied.
本実施例では、ヘテロダイン方式の例を示したが、直接
変調方式の場合には、周波数変換器１２．２２がマイク
ロ波帯の変調器になり、入力信号はディジタル信号にな
る。In this embodiment, an example of a heterodyne system is shown, but in the case of a direct modulation system, the frequency converters 12 and 22 become microwave band modulators, and the input signal becomes a digital signal.
また、本実施例では周波数オフセットのシフト量が１０
０ｋＨｚの例を示したが、交差偏波干渉除去回路の位相
差検出手段の検出時定数より、十分短い時間になるよう
に位相を高速回転させることができる周波数オフセント
であればよい。In addition, in this embodiment, the shift amount of the frequency offset is 10
Although an example of 0 kHz is shown, any frequency offset that allows the phase to be rotated at high speed so that the time is sufficiently shorter than the detection time constant of the phase difference detection means of the cross-polarization interference removal circuit may be used.
また、本発明では送信装置の局部発振周波数をオフセン
トまたはウオブリングしたが、中間周波帯の変調器を使
用する場合では、その搬送波を入力データ信号の有無を
判定して同様にオフセットまたはウオブリングする方法
を用いても本発明を実施することができる。In addition, in the present invention, the local oscillation frequency of the transmitting device is offset or wobbled, but when using an intermediate frequency band modulator, a method of similarly offsetting or wobbling the carrier wave by determining the presence or absence of an input data signal is required. The present invention can also be carried out using the following methods.
本発明は、直交偏波通信方式の両偏波の一方に、復調器
キャプチャレンジの範囲内で周波数オフセットをかける
ことにより、誤差信号の位相回転が速くなり、受信側装
置に設けられた交差偏波干渉除去回路の位相検出手段は
判定不能に陥る時間がほとんど無視できるようになる。The present invention speeds up the phase rotation of the error signal by applying a frequency offset to one of the two polarized waves in the orthogonal polarization communication system within the range of the demodulator capture range. The time during which the phase detection means of the wave interference removal circuit becomes unable to make a determination can be almost ignored.
すなわち、交差偏波干渉除去回路は安定な動作が保証さ
れる。That is, stable operation of the cross-polarization interference cancellation circuit is guaranteed.
また、第二の発明で示した変調信号が入力されたときの
み周波数オフセットをかける手段を付加することにより
、両偏波の送信装置は同一規格でよく、製造管理および
保守管理が非常に容易になる優れた効果がある。In addition, by adding a means for applying a frequency offset only when the modulated signal shown in the second invention is input, the transmitter for both polarizations can be of the same standard, making manufacturing management and maintenance management very easy. It has an excellent effect.
第１図は本発明第一の発明の一実施例を示すブロック構
成図。
第２図は本発明第二の発明の一実施例を示すブロック構
成図。
１０、２０・・・入力端子、１９．２９・・・出力端子
、１１．２１・・・局部発振器、１２．２２・・・周波
数変換器、１３．２３・・・増幅器、１４・・・変調信
号検出器。FIG. 1 is a block diagram showing an embodiment of the first aspect of the present invention. FIG. 2 is a block diagram showing an embodiment of the second invention. 10, 20... Input terminal, 19.29... Output terminal, 11.21... Local oscillator, 12.22... Frequency converter, 13.23... Amplifier, 14... Modulation signal detector.
Claims (2)
信する手段を含む送信装置と、 この電波信号を受信して偏波毎に復調する複数の復調手
段と、この復調手段の出力により交差偏波干渉を除去す
る手段とを含む受信装置と を備えた偏波多重無線通信方式において、 上記送信装置は、交差する偏波について互いにその搬送
波周波数が僅かに相違する構成であることを特徴とする
偏波多重無線通信方式。(1) A transmitting device including means for transmitting a radio signal in which different information is modulated on intersecting polarized waves, a plurality of demodulating means for receiving this radio wave signal and demodulating each polarized wave, and an output of this demodulating means In the polarization multiplexing radio communication system, the transmission device is configured such that the carrier frequencies of the crossed polarizations are slightly different from each other. Features a polarization multiplexing wireless communication system.
信する手段を含む送信装置と、 この電波信号を受信して偏波毎に復調する複数の復調手
段と、この復調手段の出力により交差偏波干渉を除去す
る手段とを含む受信装置と を備えた偏波多重無線通信方式において、 上記送信装置は、 その出力周波数が制御信号に応じて僅かに変化する局部
発振器と、 変調信号入力を検出し、その検出出力を上記制御信号と
して上記局部発振器に送出する検出回路と を備えたことを特徴とする偏波多重無線通信方式。(2) A transmitting device including a means for transmitting a radio signal in which different information is modulated on intersecting polarized waves, a plurality of demodulating means for receiving this radio wave signal and demodulating each polarized wave, and an output of this demodulating means In a polarization multiplexing wireless communication system, the transmission device includes a local oscillator whose output frequency slightly changes according to a control signal, and a modulation signal. A polarization multiplexing wireless communication system comprising: a detection circuit that detects an input and sends the detected output as the control signal to the local oscillator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25379484A JPH0616613B2 (en) | 1984-11-29 | 1984-11-29 | Polarization multiplexing wireless communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25379484A JPH0616613B2 (en) | 1984-11-29 | 1984-11-29 | Polarization multiplexing wireless communication system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61131636A true JPS61131636A (en) | 1986-06-19 |
| JPH0616613B2 JPH0616613B2 (en) | 1994-03-02 |
Family
ID=17256238
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25379484A Expired - Lifetime JPH0616613B2 (en) | 1984-11-29 | 1984-11-29 | Polarization multiplexing wireless communication system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0616613B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003073628A1 (en) * | 2002-02-28 | 2003-09-04 | Sharp Kabushiki Kaisha | Microwave band radio transmission device, microwave band radio reception device, and microwave band radio communication system |
-
1984
- 1984-11-29 JP JP25379484A patent/JPH0616613B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003073628A1 (en) * | 2002-02-28 | 2003-09-04 | Sharp Kabushiki Kaisha | Microwave band radio transmission device, microwave band radio reception device, and microwave band radio communication system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0616613B2 (en) | 1994-03-02 |
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