JPH04246955A - Input monitor control system for microwave transmitter - Google Patents

Input monitor control system for microwave transmitter

Info

Publication number
JPH04246955A
JPH04246955A JP3031969A JP3196991A JPH04246955A JP H04246955 A JPH04246955 A JP H04246955A JP 3031969 A JP3031969 A JP 3031969A JP 3196991 A JP3196991 A JP 3196991A JP H04246955 A JPH04246955 A JP H04246955A
Authority
JP
Japan
Prior art keywords
input
signal
modulator
data
modulation
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.)
Pending
Application number
JP3031969A
Other languages
Japanese (ja)
Inventor
Yoichi Yanagiuchi
柳内 洋一
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NEC Corp filed Critical NEC Corp
Priority to JP3031969A priority Critical patent/JPH04246955A/en
Publication of JPH04246955A publication Critical patent/JPH04246955A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To prevent an interference to an another system by reducing the fluctuation of the signal level of a modulator output at the time of the modulation and non-modulation. CONSTITUTION:When input data are normal, the timing of each data is made even by a flip flop 106, the data are inputted from a selector 109 to a modulator 110, and the output signal is frequency-converted, amplified, and outputted by a transmitter 123. On the other hand, when the input data are in an inhibited state, an input clock is also eliminated, an input inhibiting state is detected by an input monitor circuit 108, and an alarm as the input signal inhibiting information is transmitted. By using this alarm, the signal of a fixed data generator 107 is inputted from the selector 109 to the modulator 110, and the data signal inputted to the modulator 110 is fixed to a certain decided code point, so that the fluctuation of the level of the modulator output can be reduced at the time of the modulation and non-modulation.

Description

【発明の詳細な説明】[Detailed description of the invention]

【0001】0001

【産業上の利用分野】本発明は、マイクロ波送信システ
ムの多値直交変調装置に関し、特に、変調装置の変調器
入力部の入力監視制御方式に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multilevel quadrature modulation device for a microwave transmission system, and more particularly to an input monitoring control system for a modulator input section of a modulation device.

【0002】0002

【従来の技術】一般に、マイクロ波送信装置は、図3に
示すように、入力信号を変調する変調装置211と、変
調装置211からの変調信号に所定の処理を施して出力
する送信装置223とを備えている。変調装置211は
、データ入力端201〜204を有したリタイミング用
フリップフロップ206と、これに接続される変調器2
10とを備えている。送信装置223は変調器210か
らの信号を周波数変換器221および送信電力増幅器2
22を介して周波数変換・増幅して出力する。
2. Description of the Related Art Generally, as shown in FIG. 3, a microwave transmitter includes a modulator 211 that modulates an input signal, and a transmitter 223 that performs predetermined processing on the modulated signal from the modulator 211 and outputs the modulated signal. It is equipped with The modulation device 211 includes a retiming flip-flop 206 having data input terminals 201 to 204, and a modulator 2 connected to the retiming flip-flop 206.
10. A transmitter 223 converts the signal from the modulator 210 into a frequency converter 221 and a transmission power amplifier 2.
22, the frequency is converted and amplified, and the signal is output.

【0003】従来、入力監視制御方式は、変調装置21
1の入力部において、図3に示すように、入力クロック
信号を入力監視回路208で監視し、入力警報を送出す
るだけのものであった。
[0003] Conventionally, in the input monitoring control system, the modulation device 21
As shown in FIG. 3, the input section of No. 1 merely monitors the input clock signal with an input monitoring circuit 208 and sends out an input alarm.

【0004】0004

【発明が解決しようとする課題】上述した従来の変調装
置における入力監視方式にあっては、変調装置211の
入力信号が断となった場合、変調装置入力のリタイミン
グ用フリップフロップ206で、クロック信号が断とな
る直前のデータ信号が保持され、変調器210に入力さ
れるため、図4に示すように、変調器210の出力信号
はどの符号点に固定されるか不確実であるという問題が
あった。図4においては、16QAMの場合、符号点に
より3種類の振幅(A1 ,A2 ,A3 )がある。 A1 とA3 の差は約10dBである。
[Problems to be Solved by the Invention] In the input monitoring system in the conventional modulation device described above, when the input signal to the modulation device 211 is cut off, the retiming flip-flop 206 of the input to the modulation device Since the data signal immediately before the signal is cut off is held and input to the modulator 210, as shown in FIG. 4, there is a problem in that it is uncertain which code point the output signal of the modulator 210 will be fixed to. was there. In FIG. 4, in the case of 16QAM, there are three types of amplitudes (A1, A2, A3) depending on the code point. The difference between A1 and A3 is approximately 10 dB.

【0005】このため変調器出力の信号レベルは固定さ
れる符号点により大きく異なり、例えば、変調時の平均
電力と大きく異なる電力を出力する符号点に固定された
場合、変調装置の出力に接続される無線送信装置の自動
出力レベル安定化回路がステップ応答することになり、
図5に示すように、過度応答時に通常より大きな出力を
送信し、他の回線に干渉したり、送信電力増幅器の歪雑
音増加により隣接チャネルを妨害する欠点がある。図5
中S1 ,S2 のとき他のシステムを妨害する。
[0005] For this reason, the signal level of the modulator output varies greatly depending on the fixed code point. For example, if the signal level is fixed at a code point that outputs a power that is significantly different from the average power during modulation, the signal level connected to the output of the modulator The automatic output level stabilization circuit of the wireless transmitter will respond step-by-step.
As shown in FIG. 5, there is a drawback that a larger output than usual is transmitted during a transient response, which may interfere with other lines or interfere with adjacent channels due to increased distortion noise of the transmission power amplifier. Figure 5
Interferes with other systems when in S1 and S2.

【0006】本発明は、上記の問題点にかんがみてなさ
れたもので、変調器出力の信号レベルを変調時と無変調
時で変動を少なくし、他システムへの干渉の防止を図っ
たマイクロ波送信装置の入力監視制御方式の提供を目的
とする。
The present invention has been made in view of the above-mentioned problems, and is a microwave system that reduces the variation in the signal level of the modulator output between modulation and non-modulation, and prevents interference with other systems. The purpose is to provide an input monitoring control method for transmitting devices.

【0007】[0007]

【課題を解決するための手段】上記目的を達成するため
本発明のマイクロ波送信装置の入力監視制御方式は、入
力信号を変調器で変調する変調装置と、変調装置からの
変調信号に所定の処理を施して出力する送信装置とを備
えたマイクロ波送信装置の上記変調装置における入力監
視制御方式において、入力ロック信号を監視し入力信号
断情報を送信する入力信号監視回路と、固定データ信号
を発生する固定データ発生器と、上記入力信号断情報に
基づいて入力データ信号か固定データ信号かを選択する
セレクタとを有し、入力信号断時には常に変調器に固定
データを入力し、変調器出力が常に同じ符号点を選択す
るようにした構成としてある。
[Means for Solving the Problems] In order to achieve the above object, the input monitoring control method for a microwave transmitting device of the present invention includes a modulation device that modulates an input signal with a modulator, and a predetermined modulation signal applied to the modulation signal from the modulation device. In the input monitoring control method in the modulation device of the microwave transmitting device, which includes a transmitting device that performs processing and outputs the input signal, an input signal monitoring circuit that monitors an input lock signal and transmits input signal disconnection information, and a fixed data signal It has a fixed data generator that generates fixed data, and a selector that selects an input data signal or a fixed data signal based on the input signal disconnection information, and always inputs fixed data to the modulator when the input signal is disconnected, and outputs the modulator. The configuration is such that the same code point is always selected.

【0008】そして、必要に応じ、送信装置は変調器か
らの出力信号の周波数変換を行なう周波数変換器と、周
波数変換器からの信号を増幅する送信電力増幅器とを備
えている構成としてある。
[0008] If necessary, the transmitter is configured to include a frequency converter for frequency converting the output signal from the modulator and a transmission power amplifier for amplifying the signal from the frequency converter.

【0009】[0009]

【作用】上記構成からなるマイクロ波送信装置の入力監
視制御方式によれば、入力クロック信号を監視し、この
警報信号を用い、変調器入力部のデータセレクタが制御
され、入力信号断時には、平均電力に最も近い符号点に
固定されるよう制御される。
[Operation] According to the input monitoring control method of the microwave transmitter having the above configuration, the input clock signal is monitored, and this alarm signal is used to control the data selector of the modulator input section, and when the input signal is interrupted, the average It is controlled to be fixed to the code point closest to the power.

【0010】0010

【実施例】以下、本発明の実施例について図面を参照し
て説明する。図1は本発明の一実施例に係るマイクロ波
送信装置を示し、16QAM(16値直交振幅変調)方
式に用いた場合のブロック図である。
Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a microwave transmitter according to an embodiment of the present invention, and is a block diagram when used in a 16QAM (16-value quadrature amplitude modulation) system.

【0011】マイクロ波送信装置は、入力信号を変調す
る変調装置111と変調装置111からの変調信号に所
定の処理を施して出力する送信装置123とを備えてい
る。
The microwave transmitting device includes a modulating device 111 that modulates an input signal, and a transmitting device 123 that performs predetermined processing on the modulated signal from the modulating device 111 and outputs the resultant signal.

【0012】変調装置111は、データ入力端101〜
104,クロック入力端105,リタイミング用フリッ
プフロップ106,符号点固定用データ信号発生器10
7,入力監視回路108,セレクタ109,変調器11
0から構成されている。
The modulation device 111 has data input terminals 101 to
104, clock input terminal 105, retiming flip-flop 106, code point fixing data signal generator 10
7, input monitoring circuit 108, selector 109, modulator 11
Consists of 0.

【0013】入力監視回路108は入力クロック信号を
監視し入力信号断情報を送信するものである。セレクタ
109は上記入力信号断情報に基づいて入力データ信号
か固定データ信号かを選択するものである。
The input monitoring circuit 108 monitors the input clock signal and transmits input signal disconnection information. The selector 109 selects either the input data signal or the fixed data signal based on the input signal interruption information.

【0014】送信装置123は周波数変換器121と送
信電力増幅器122とから構成されている。
The transmitter 123 is composed of a frequency converter 121 and a transmission power amplifier 122.

【0015】したがって、この入力監視制御方式によれ
ば、入力データが正常にある場合は、フリップフロップ
106で各データはタイミングをそろえ、セレクタ10
9は入力データを変調器110へ入力するモードとなり
、変調器110は入力データで変調され、出力信号は送
信装置123により周波数変換・増幅されて出力される
Therefore, according to this input monitoring control method, when the input data is normal, the timing of each data is aligned in the flip-flop 106 and the selector 10
9 is a mode in which input data is input to the modulator 110, the modulator 110 is modulated with the input data, and the output signal is frequency-converted and amplified by the transmitter 123 and output.

【0016】入力データが断の状態では、入力クロック
も消失するため入力監視回路108で入力断状態を検出
し、警報を送出する。この警報を用い、セレクタ109
を固定データ発生器107の信号を変調器110に入力
し、符号点を図2に示す点に固定する。
When the input data is off, the input clock also disappears, so the input monitoring circuit 108 detects the input off state and sends out an alarm. Using this alarm, the selector 109
The signal from the fixed data generator 107 is input to the modulator 110, and the code point is fixed at the point shown in FIG.

【0017】16QAMの平均パワーは最大振幅値をA
とすれば(5/18)A2 で表わされ、図2の点に固
定したときの出力パワーは(5/18)A2 であり、
変調されているときと同じ値となる。
The average power of 16QAM is the maximum amplitude value A
Then, it is expressed as (5/18)A2, and the output power when fixed at the point in Figure 2 is (5/18)A2,
The same value as when modulated.

【0018】[0018]

【発明の効果】以上説明したように本発明のマイクロ波
送信装置の入力監視制御方式によれば、変調装置入力断
情報で、変調器に入力されるデータ信号をある決められ
た符号点に固定することにより、変調器出力のレベルを
変調時と無変調時で変動を少なくすることができ、他の
システムへの干渉を防ぐことができるという効果がある
As explained above, according to the input monitoring control method of the microwave transmitter of the present invention, the data signal input to the modulator is fixed to a certain predetermined code point based on the modulator input disconnection information. By doing so, it is possible to reduce fluctuations in the level of the modulator output between modulation and non-modulation, and there is an effect that interference with other systems can be prevented.

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

【図1】本発明の実施例に係るマイクロ波送信装置を示
すブロック図である。
FIG. 1 is a block diagram showing a microwave transmitter according to an embodiment of the present invention.

【図2】実施例に係る入力監視制御方式の説明のための
ベクトル図である。
FIG. 2 is a vector diagram for explaining the input monitoring control method according to the embodiment.

【図3】従来のマイクロ波送信装置を示すブロック図で
ある。
FIG. 3 is a block diagram showing a conventional microwave transmitter.

【図4】従来の入力監視制御方式の説明のためのベクト
ル図である。
FIG. 4 is a vector diagram for explaining a conventional input monitoring control method.

【図5】従来方式の欠点を説明するグラフである。FIG. 5 is a graph explaining the drawbacks of the conventional method.

【符号の説明】[Explanation of symbols]

101    データ入力端 102    データ入力端 103    データ入力端 104    データ入力端 105    クロック入力端 106    フリップフロップ 107    固定データ信号発生器 108    入力監視回路 109    セレクタ 110    変調器 111    変調装置 121    周波数変換器 122    送信電力増幅器 123    送信装置 201    データ入力端 202    データ入力端 203    データ入力端 204    データ入力端 205    クロック入力端 206    フリップフロップ 208    入力監視回路 210    変調器 211    変調装置 221    周波数変換器 222    送信電力増幅器 223    送信装置 101 Data input terminal 102 Data input terminal 103 Data input terminal 104 Data input terminal 105 Clock input terminal 106 Flip-flop 107 Fixed data signal generator 108 Input monitoring circuit 109 Selector 110 Modulator 111 Modulation device 121 Frequency converter 122 Transmission power amplifier 123 Transmitting device 201 Data input terminal 202 Data input terminal 203 Data input terminal 204 Data input terminal 205 Clock input terminal 206 Flip-flop 208 Input monitoring circuit 210 Modulator 211 Modulation device 221 Frequency converter 222 Transmission power amplifier 223 Transmitting device

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】  入力信号を変調器で変調する変調装置
と、変調装置からの変調信号に所定の処理を施して出力
する送信装置とを備えたマイクロ波送信装置の上記変調
装置における入力監視制御方式において、入力ロック信
号を監視し入力信号断情報を送信する入力信号監視回路
と、固定データ信号を発生する固定データ発生器と、上
記入力信号断情報に基づいて入力データ信号か固定デー
タ信号かを選択するセレクタとを有し、入力信号断時に
は常に変調器に固定データを入力し、変調器出力が常に
同じ符号点を選択するようにしたことを特徴とするマイ
クロ波送信装置の入力監視制御方式。
1. Input monitoring control in the modulation device of a microwave transmission device comprising a modulation device that modulates an input signal with a modulator, and a transmission device that performs predetermined processing on the modulated signal from the modulation device and outputs it. The method includes: an input signal monitoring circuit that monitors an input lock signal and transmits input signal disconnection information; a fixed data generator that generates a fixed data signal; input monitoring control for a microwave transmitting device, characterized in that the input monitoring control for a microwave transmitting device is characterized in that fixed data is always input to the modulator when the input signal is cut off, and the modulator output always selects the same code point. method.
【請求項2】  送信装置は変調器からの出力信号の周
波数変換を行なう周波数変換器と、周波数変換器からの
信号を増幅する送信電力増幅器とを備えていることを特
徴とする請求項1記載のマイクロ波送信装置の入力監視
制御方式。
2. The transmitter according to claim 1, wherein the transmitting device includes a frequency converter that converts the frequency of the output signal from the modulator, and a transmission power amplifier that amplifies the signal from the frequency converter. Input monitoring control method for microwave transmitter.
JP3031969A 1991-01-31 1991-01-31 Input monitor control system for microwave transmitter Pending JPH04246955A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3031969A JPH04246955A (en) 1991-01-31 1991-01-31 Input monitor control system for microwave transmitter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3031969A JPH04246955A (en) 1991-01-31 1991-01-31 Input monitor control system for microwave transmitter

Publications (1)

Publication Number Publication Date
JPH04246955A true JPH04246955A (en) 1992-09-02

Family

ID=12345784

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3031969A Pending JPH04246955A (en) 1991-01-31 1991-01-31 Input monitor control system for microwave transmitter

Country Status (1)

Country Link
JP (1) JPH04246955A (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5271911A (en) * 1975-12-11 1977-06-15 Fujitsu Ltd Dc-ac amplitude modulation transmitting system
JPS6212241A (en) * 1985-07-09 1987-01-21 Nec Corp Digital transmission system
JPH01194551A (en) * 1988-01-29 1989-08-04 Nec Corp Digital micro-wave communication system
JPH03237444A (en) * 1990-02-14 1991-10-23 Canon Inc Single-lens reflex camera

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5271911A (en) * 1975-12-11 1977-06-15 Fujitsu Ltd Dc-ac amplitude modulation transmitting system
JPS6212241A (en) * 1985-07-09 1987-01-21 Nec Corp Digital transmission system
JPH01194551A (en) * 1988-01-29 1989-08-04 Nec Corp Digital micro-wave communication system
JPH03237444A (en) * 1990-02-14 1991-10-23 Canon Inc Single-lens reflex camera

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