JP2738213B2 - Transmission power control device - Google Patents
Transmission power control deviceInfo
- Publication number
- JP2738213B2 JP2738213B2 JP9811692A JP9811692A JP2738213B2 JP 2738213 B2 JP2738213 B2 JP 2738213B2 JP 9811692 A JP9811692 A JP 9811692A JP 9811692 A JP9811692 A JP 9811692A JP 2738213 B2 JP2738213 B2 JP 2738213B2
- Authority
- JP
- Japan
- Prior art keywords
- output
- signal
- transmission power
- power control
- modulators
- 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.)
- Expired - Fee Related
Links
Landscapes
- Transmitters (AREA)
- Radio Transmission System (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、マイクロ波通信方式の
送信電力制御装置に利用する。特に、マルチキャリア伝
送を行うマイクロ波通信方式の送信電力制御装置に関す
るものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for a transmission power control device of a microwave communication system. In particular, the present invention relates to a transmission power control device of a microwave communication system that performs multicarrier transmission.
【０００２】[0002]
【従来の技術】図３は従来例の送信電力制御装置のブロ
ック構成図である。2. Description of the Related Art FIG. 3 is a block diagram of a conventional transmission power control device.
【０００３】従来、送信電力制御装置は、図３に示すよ
うに、ベースバンド信号を変調する変調器１ａ〜１ｃ
と、ベースバンド信号のクロック信号またはデータ信号
の断検出を行う断検出器２ａ〜２ｃと、各変調器出力を
合成する合成器４と、合成器４の出力を無線周波数へ変
換する周波数変換器５と、周波数変換器５の出力を増幅
する可変利得増幅器６と、可変利得増幅器６の出力レベ
ルを検出するレベル検出器７と、レベル検出器７の出力
と基準電圧とを比較する比較器８と、比較器８の出力よ
り可変利得増幅器６の利得を制御する可変利得制御回路
１０と、断検出器２ａ〜２ｃよりキャリア数を識別する
識別器１１と、識別器１１の出力よりキャリア数に応じ
て基準電圧を可変するための基準電圧発生器９とを有し
ている。Conventionally, as shown in FIG. 3, a transmission power control apparatus includes modulators 1a to 1c for modulating a baseband signal.
A disconnection detector 2a-2c for detecting a disconnection of a clock signal or a data signal of a baseband signal; a combiner 4 for combining the outputs of the modulators; and a frequency converter for converting the output of the combiner 4 to a radio frequency. 5, a variable gain amplifier 6 for amplifying the output of the frequency converter 5, a level detector 7 for detecting the output level of the variable gain amplifier 6, and a comparator 8 for comparing the output of the level detector 7 with a reference voltage. A variable gain control circuit 10 for controlling the gain of the variable gain amplifier 6 from the output of the comparator 8; a discriminator 11 for discriminating the number of carriers from the disconnection detectors 2a to 2c; And a reference voltage generator 9 for varying the reference voltage accordingly.
【０００４】図３において、送信制御装置は送信するキ
ャリア数により可変利得増幅器の出力レベルを変化さ
せ、常に１キャリア当りの送信レベルを所定レベルに保
つようにしていた。In FIG. 3, the transmission control device changes the output level of the variable gain amplifier according to the number of carriers to be transmitted, and always keeps the transmission level per carrier at a predetermined level.
【０００５】[0005]
【発明が解決しようとする課題】しかし、このような従
来例の送信電力制御装置では、変調器の出力がクロック
信号断時またはデータ信号断時に無変調の搬送波が出力
されるために、送信出力レベルはこの無変調の搬送波レ
ベルと正常な変調波レベルとのトータルレベルで決定さ
れるので、図４に示すように無変調の搬送波レベルに影
響されて変調波の１キャリア当りの出力レベルが所定レ
ベルとならない問題点があった。However, in such a conventional transmission power control device, since the output of the modulator outputs a non-modulated carrier when the clock signal or data signal is interrupted, the transmission output power is controlled. Since the level is determined by the total level of the unmodulated carrier wave level and the normal modulated wave level, the output level per carrier of the modulated wave is determined by the unmodulated carrier wave level as shown in FIG. There was a problem that was not level.
【０００６】図４は従来例の送信電力制御装置の合成器
および可変利得増幅器の出力スペクトラムを示す図であ
り、図４（ａ）は三つのキャリアの内二つのキャリアが
無変調のときの可変利得増幅器の出力スペクトラムを示
し、図４（ｂ）は図４（ａ）のときの合成器の出力スペ
クトラムを示し無変調波のレベルの影響で正常な変調波
のレベルが低くなっていることを示す。FIG. 4 is a diagram showing an output spectrum of a combiner and a variable gain amplifier of a conventional transmission power control device. FIG. 4 (a) shows a variable output when two of three carriers are not modulated. 4B shows the output spectrum of the gain amplifier, and FIG. 4B shows the output spectrum of the combiner at the time of FIG. 4A, showing that the level of the normal modulated wave is lower due to the effect of the level of the unmodulated wave. Show.
【０００７】本発明は上記の問題点を解決するもので、
１キャリア当たりの送信出力レベルを常に所定レベルに
保つことができる送信電力制御装置を提供することを目
的とする。The present invention solves the above problems,
It is an object of the present invention to provide a transmission power control device capable of always maintaining a transmission output level per carrier at a predetermined level.
【０００８】[0008]
【課題を解決するための手段】本発明は、キャリアをベ
ースバンド信号で変調し中間周波数信号を出力する複数
の変調器と、この変調器からベースバンド信号の断を検
出する断検出器と、上記複数の変調器の出力信号を合成
する合成器と、この合成器の出力信号を無線周波数信号
に周波数変換する周波数変換器と、入力する基準電圧に
基づきこの周波数変換器の出力信号の自動利得制御を行
う可変利得増幅手段と、上記断検出器の検出結果に基づ
き伝送するキャリア数を識別する識別器と、この識別器
の出力するキャリア数に基づき上記基準電圧を出力する
基準電圧発生器とを備えた送信電力制御装置において、
上記複数の変調器と上記合成器との間にそれぞれ挿入さ
れ対応する断検出器の検出結果に基づき対応する変調器
の出力信号を断とする切替器を備えたことを特徴とす
る。SUMMARY OF THE INVENTION The present invention comprises a plurality of modulators for modulating a carrier with a baseband signal and outputting an intermediate frequency signal; a disconnection detector for detecting a disconnection of the baseband signal from the modulator; A synthesizer for synthesizing the output signals of the plurality of modulators, a frequency converter for frequency-converting the output signal of the synthesizer to a radio frequency signal, and an automatic gain of the output signal of the frequency converter based on an input reference voltage Variable gain amplifying means for performing control, an identifier for identifying the number of carriers to be transmitted based on the detection result of the disconnection detector, and a reference voltage generator for outputting the reference voltage based on the number of carriers output from the identifier. In the transmission power control device provided with
A switch is provided between each of the plurality of modulators and the combiner to switch off the output signal of the corresponding modulator based on the detection result of the corresponding disconnection detector.
【０００９】[0009]
【作用】複数の変調器と合成器との間にそれぞれ挿入さ
れた切替器で対応する断検出器の検出結果に基づき対応
する変調器の出力信号を断とする。The output signals of the corresponding modulators are turned off based on the detection results of the corresponding cutoff detectors at the switches inserted between the plurality of modulators and the combiner.
【００１０】以上により１キャリア当たりの送信出力レ
ベルを常に所定レベルに保つことができる。As described above, the transmission output level per carrier can always be maintained at a predetermined level.
【００１１】[0011]
【実施例】本発明の実施例について図面を参照して説明
する。Embodiments of the present invention will be described with reference to the drawings.
【００１２】図１において、送信電力制御装置は、キャ
リアをベースバンド信号で変調し中間周波数信号を出力
する複数の変調器１ａ〜１ｃと、変調器１ａ〜１ｃから
ベースバンド信号の断を検出する断検出器２ａ〜２ｃ
と、変調器１ａ〜１ｃの出力信号を合成する合成器４
と、合成器４の出力信号を無線周波数信号に周波数変換
する周波数変換器５と、入力する基準電圧に基づきこの
周波数変換器５の出力信号の自動利得制御を行う可変利
得増幅手段として可変利得増幅器６、レベル検出器７、
比較器８および可変利得制御回路１０と、断検出器２ａ
〜２ｃの検出結果に基づき伝送するキャリア数を識別す
る識別器１１と、識別器１１の出力するキャリア数に基
づき上記基準電圧を出力する基準電圧発生器９とを備え
る。In FIG. 1, a transmission power control apparatus detects a plurality of modulators 1a to 1c for modulating a carrier with a baseband signal and outputting an intermediate frequency signal, and a disconnection of the baseband signal from the modulators 1a to 1c. Disconnection detectors 2a to 2c
And a combiner 4 for combining output signals of the modulators 1a to 1c.
A frequency converter 5 for converting the output signal of the synthesizer 4 into a radio frequency signal, and a variable gain amplifier as variable gain amplifying means for performing automatic gain control of the output signal of the frequency converter 5 based on an input reference voltage. 6, level detector 7,
Comparator 8, variable gain control circuit 10, disconnection detector 2a
And a reference voltage generator 9 for outputting the reference voltage based on the number of carriers output from the discriminator 11.
【００１３】ここで本発明の特徴とするところは、変調
器１ａ〜１ｃと合成器４との間にそれぞれ挿入され対応
する断検出器２の検出結果に基づき対応する変調器１の
出力信号を断とする切替器３ａ〜３ｃを備えたことにあ
る。A feature of the present invention is that the output signal of the corresponding modulator 1 is inserted between the modulators 1a to 1c and the synthesizer 4 based on the detection result of the corresponding disconnection detector 2, respectively. That is, the switching devices 3a to 3c to be disconnected are provided.
【００１４】このような構成の送信電力制御装置の動作
について説明する。図２は本発明の送信電力制御装置の
合成器の出力スペクトラムを示す図である。The operation of the transmission power control device having such a configuration will be described. FIG. 2 is a diagram showing an output spectrum of the combiner of the transmission power control device of the present invention.
【００１５】図１および図２において、変調器１ａ〜１
ｃはそれぞれ入力ベースバンド信号を変調し、異なる中
間周波信号として出力する。合成器４は変調器１ａ〜１
ｃの出力信号を合成し、その出力信号の周波数スペクト
ラムは図２（ａ）となる。断検出器２ａ〜２ｃは変調器
１ａ〜１ｃのベースバンド信号の断検出を行い、ベース
バンド信号が断となり変調器１ａ〜１ｃ出力が無変調波
の場合や正常な変調が行われない場合には、図２（ｂ）
に示すように切替器３ａ〜３ｃを断とする信号を出力す
る。周波数変換器５は中間周波信号を無線周波信号へ変
換し、可変利得増幅器６は送信出力を所定レベルに増幅
する。可変利得制御回路１０は、可変利得増幅器６の利
得を制御し、入力レベルが変動しても出力レベルを所定
レベルに保つよう自動可変利得制御を行う。この自動可
変利得制御は出力レベル検出器７の出力と基準電圧発生
器９の出力とを比較器８で比較し、その差が零となるよ
うに可変利得制御回路１０で可変利得増幅器６の利得を
可変することで行われる。この自動可変利得制御は三つ
のキャリアのトータルレベルを検出しているので、たと
えば一つのキャリアのみ送信する場合には出力レベルを
下げる必要がある。そうしないと隣接する装置の出力レ
ベルより送信レベルが高くなり隣接チャンネル干渉を引
起こす。そのために識別器１１は断検出器２ａ〜２ｃの
状態により送信しているキャリア数を識別し、基準電圧
発生器９の出力をキャリア数に応じて可変することによ
り１キャリア当りの送信出力レベルを常に所定レベルと
なるようにする。図２（ｃ）は出力スペクトラムであり
変調波のレベルは常に隣接キャリアと同じレベルで出力
される。In FIGS. 1 and 2, modulators 1a to 1a
c modulates each of the input baseband signals and outputs them as different intermediate frequency signals. The synthesizer 4 includes the modulators 1a to 1
The output signal of c is synthesized, and the frequency spectrum of the output signal is as shown in FIG. The disconnection detectors 2a to 2c detect the disconnection of the baseband signals of the modulators 1a to 1c. When the baseband signal is disconnected and the output of the modulators 1a to 1c is an unmodulated wave or when normal modulation is not performed. Fig. 2 (b)
As shown in (1), a signal for turning off the switches 3a to 3c is output. The frequency converter 5 converts the intermediate frequency signal into a radio frequency signal, and the variable gain amplifier 6 amplifies the transmission output to a predetermined level. The variable gain control circuit 10 controls the gain of the variable gain amplifier 6 and performs automatic variable gain control so as to keep the output level at a predetermined level even if the input level fluctuates. In this automatic variable gain control, the output of the output level detector 7 and the output of the reference voltage generator 9 are compared by the comparator 8, and the gain of the variable gain amplifier 6 is controlled by the variable gain control circuit 10 so that the difference becomes zero. Is made variable. Since this automatic variable gain control detects the total level of three carriers, it is necessary to lower the output level when only one carrier is transmitted, for example. Otherwise, the transmission level will be higher than the output level of the adjacent device, causing adjacent channel interference. For this purpose, the discriminator 11 discriminates the number of carriers being transmitted according to the state of the disconnection detectors 2a to 2c, and varies the output of the reference voltage generator 9 according to the number of carriers, thereby reducing the transmission output level per carrier. Always keep it at a predetermined level. FIG. 2C shows the output spectrum, in which the level of the modulated wave is always output at the same level as that of the adjacent carrier.
【００１６】上述のように、本実施例は、入力ベースバ
ンド信号のクロック信号またはデータ信号の断を検出
し、断となっているキャリアの変調器出力を切替器によ
り断とし、同時にキャリア数に応じて基準電圧発生器出
力を可変することにより１キャリア当りの送信出力レベ
ルを常に所定レベルに保つことができる。As described above, in the present embodiment, the disconnection of the clock signal or the data signal of the input baseband signal is detected, the modulator output of the disconnected carrier is switched off by the switch, and the number of carriers is simultaneously reduced. By varying the output of the reference voltage generator accordingly, the transmission output level per carrier can always be kept at a predetermined level.
【００１７】[0017]
【発明の効果】以上説明したように、本発明は、１キャ
リア当たりの送信出力レベルを常に所定レベルに保つこ
とができる優れた効果がある。As described above, the present invention has an excellent effect that the transmission output level per carrier can always be kept at a predetermined level.
【図面の簡単な説明】[Brief description of the drawings]
【図１】本発明一実施例送信電力制御装置のブロック構
成図。FIG. 1 is a block diagram of a transmission power control device according to an embodiment of the present invention.
【図２】本発明の送信電力制御装置の合成器の出力スペ
クトルを示す図。FIG. 2 is a diagram showing an output spectrum of a combiner of the transmission power control device of the present invention.
【図３】従来例の送信電力制御装置のブロック構成図。FIG. 3 is a block diagram of a conventional transmission power control device.
【図４】従来例の送信電力制御装置の合成器および可変
利得増幅器の出力スペクトラムを示す図。FIG. 4 is a diagram showing an output spectrum of a combiner and a variable gain amplifier of a conventional transmission power control device.
１ａ〜１ｃ 変調器 ２ａ〜２ｃ 断検出器 ３ａ〜３ｃ 切替器 ４ 合成器 ５ 周波数変換器 ６ 可変利得増幅器 ７ レベル検出器 ８ 比較器 ９ 基準電圧発生器 １０ 可変利得制御回路 １１ 識別器 1a-1c Modulator 2a-2c Disconnection Detector 3a-3c Switch 4 Synthesizer 5 Frequency Converter 6 Variable Gain Amplifier 7 Level Detector 8 Comparator 9 Reference Voltage Generator 10 Variable Gain Control Circuit 11 Discriminator
Claims (1)
間周波数信号を出力する複数の変調器と、この変調器か
らベースバンド信号の断を検出する断検出器と、上記複
数の変調器の出力信号を合成する合成器と、この合成器
の出力信号を無線周波数信号に周波数変換する周波数変
換器と、入力する基準電圧に基づきこの周波数変換器の
出力信号の自動利得制御を行う可変利得増幅手段と、上
記断検出器の検出結果に基づき伝送するキャリア数を識
別する識別器と、この識別器の出力するキャリア数に基
づき上記基準電圧を出力する基準電圧発生器とを備えた
送信電力制御装置において、 上記複数の変調器と上記合成器との間にそれぞれ挿入さ
れ対応する断検出器の検出結果に基づき対応する変調器
の出力信号を断とする切替器を備えたことを特徴とする
送信電力制御装置。1. A plurality of modulators for modulating a carrier with a baseband signal and outputting an intermediate frequency signal, a disconnection detector for detecting disconnection of a baseband signal from the modulator, and output signals of the plurality of modulators A frequency converter that frequency-converts an output signal of the synthesizer into a radio frequency signal, and a variable gain amplifying unit that performs automatic gain control of an output signal of the frequency converter based on an input reference voltage. A transmission power control apparatus including a discriminator that identifies the number of carriers to be transmitted based on the detection result of the disconnection detector, and a reference voltage generator that outputs the reference voltage based on the number of carriers output by the discriminator. A switching device that is inserted between the plurality of modulators and the synthesizer and that cuts off the output signal of the corresponding modulator based on the detection result of the corresponding disconnection detector. Transmission power control apparatus according to symptoms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9811692A JP2738213B2 (en) | 1992-04-17 | 1992-04-17 | Transmission power control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9811692A JP2738213B2 (en) | 1992-04-17 | 1992-04-17 | Transmission power control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05300030A JPH05300030A (en) | 1993-11-12 |
| JP2738213B2 true JP2738213B2 (en) | 1998-04-08 |
Family
ID=14211338
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9811692A Expired - Fee Related JP2738213B2 (en) | 1992-04-17 | 1992-04-17 | Transmission power control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2738213B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8422434B2 (en) * | 2003-02-18 | 2013-04-16 | Qualcomm Incorporated | Peak-to-average power ratio management for multi-carrier modulation in wireless communication systems |
| JP5052325B2 (en) * | 2007-12-25 | 2012-10-17 | ホーチキ株式会社 | Relay broadcast station equipment |
-
1992
- 1992-04-17 JP JP9811692A patent/JP2738213B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05300030A (en) | 1993-11-12 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |