JPS58143635A - Transmission power controlling system of satellite communication - Google Patents
Transmission power controlling system of satellite communicationInfo
- Publication number
- JPS58143635A JPS58143635A JP2525082A JP2525082A JPS58143635A JP S58143635 A JPS58143635 A JP S58143635A JP 2525082 A JP2525082 A JP 2525082A JP 2525082 A JP2525082 A JP 2525082A JP S58143635 A JPS58143635 A JP S58143635A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- station
- transmission power
- data
- transmission
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
Abstract
Description
【発明の詳細な説明】
（技術分野）
本発明は、降雨減衰等の要因により伝搬損失が変動する
衛星通信方式において、受信局で回線品質を検出し、伝
搬損失の変動にあわせて送信電力を変化させ、回線品質
が常時基準値となるようにする送信電力制御方式に関す
るものである。Detailed Description of the Invention (Technical Field) The present invention detects line quality at a receiving station in a satellite communication system where propagation loss fluctuates due to factors such as rain attenuation, and adjusts transmission power according to fluctuations in propagation loss. This relates to a transmission power control method that changes the line quality so that it always maintains a reference value.
（背景技術）
従来の送信電力を制御する方法としては、自局から衛星
を介して自局までの折り返し回線の回線品質を測定し、
衛星中継器の入力点において自局からの受信入力レベル
が一定となるように自局の送信電力を制御する方法があ
る。この場合は、自局から衛星までのアップリンクの伝
搬損失の変動の補償のみであり、衛星から相手局までの
ダウンリンクの伝搬損失の変動については、衛星送信出
力がこの変動分をマージンとして見込むように自局の送
信電力が制御されており、１台の中継器に対向する複数
の地球局がＦＤＭ方式を用いてアクセスする衛星通信方
式では、回線容量が減少する等の問題がある。また、ア
ナログ信号を伝送する衛星通信方式においては、通信回
線のベースバンド帯で２チヤネルの回線品質測定用のチ
ャネルを設け、１チヤネルは相手局から自局までの回線
品質の測定に、また他の１チヤネルは自局から相手局を
介して自局までの折り返し回線の回線品質の測定に使用
し、これら両回線品質より得られる自局から相手局およ
び相手局から自局の双方向の回線品質が基準値となるよ
うに送信電力を制御する方法がある。しかし、ディジタ
ル信号を伝送する衛星通信方式においては、高速の通信
回線に高速の回線品質測定用のチャネルを設けることは
困難であり、また低速の測定用チャネルを設けても高速
回線の品質測定はできないので、ディジタル信号を伝送
する方式にはこの送信電力制御方式を応用することはで
きない。(Background technology) A conventional method for controlling transmission power is to measure the line quality of the return line from the local station to the local station via the satellite,
There is a method of controlling the transmission power of the own station so that the received input level from the own station is constant at the input point of the satellite repeater. In this case, only the fluctuation in uplink propagation loss from the own station to the satellite is compensated for, and for the fluctuation in downlink propagation loss from the satellite to the other station, the satellite transmission output is expected to account for this fluctuation as a margin. In a satellite communication system in which the transmission power of the own station is controlled in this way, and a plurality of earth stations facing one repeater access the satellite using the FDM system, there are problems such as a decrease in line capacity. In addition, in the satellite communication system that transmits analog signals, two channels are provided in the baseband band of the communication line for measuring the line quality, and one channel is used to measure the line quality from the other station to the own station, and the other One channel is used to measure the line quality of the return line from the local station to the local station via the other station, and the two-way line quality from the local station to the other station and from the other station to the local station obtained from these two line qualities. There is a method of controlling transmission power so that the quality becomes a reference value. However, in satellite communication systems that transmit digital signals, it is difficult to provide a channel for high-speed line quality measurement on a high-speed communication line, and even if a low-speed measurement channel is provided, it is difficult to measure the quality of a high-speed line. Therefore, this transmission power control method cannot be applied to a method for transmitting digital signals.
（発明の課題）
本発明は、ディジタル信号を伝送する場合に、誤り訂正
符号方式を採用することにより受信局において誤り訂正
復号化する際に発生する誤りパルスより回線品質を測定
し、この回線品質が常時基準値となるよう送信電力を制
御することを特徴とし、その目的は多数の対向する地球
局が衛星中継器の送信出力の利用効率の向上をはかり、
回線容量を増大することにある。本発明は、例えば、５
ＣＰＣ方式で１台の衛星沖継器に多数の地球局がアクセ
スする方式に好適に応用することができる。(Problem to be solved by the invention) When transmitting a digital signal, the present invention measures the line quality from error pulses generated during error correction decoding at a receiving station by adopting an error correction coding method, and measures the line quality. It is characterized by controlling the transmission power so that it is always a reference value, and the purpose is to improve the efficiency of use of the transmission output of the satellite repeater by a large number of opposing earth stations.
The goal is to increase line capacity. The present invention provides, for example, 5
The CPC method can be suitably applied to a system in which a large number of earth stations access one satellite offshore relay.
（発明の構成および作用） 以下図面を用いて本発明の詳細な説明する。(Structure and operation of the invention) The present invention will be described in detail below using the drawings.
第１図は、本発明を適用する衛星通信方式の構成の例を
示したものであり、１は１台の衛星中継器を示し、２は
これにアクセスする各地球局を示している。Ａ局とＢ局
間の通信を例にとって説明する。Ａ局より送信されるＡ
−＋Ｂの通信回線はＢ局で受信され、Ｂ局においてＡ→
Ｂの回線品質を測定し、この回線品質を基準、値にする
ための制御情報を構成し、この制御情報をＢ−＋Ａの通
信回線を利用してＡ局へ送出し、Ａ局ではＢ局より送ら
れた制御情報にもとづきＡ→Ｂの回線の送信電力を制御
する。Ｂ−＋Ａの通信回線についても、前述したＡ−＋
Ｂの通信回線と同様にして、回線品質が基準となるよう
にＢ局の送信電力が制御される。FIG. 1 shows an example of the configuration of a satellite communication system to which the present invention is applied, in which 1 represents one satellite repeater, and 2 represents each earth station that accesses it. Communication between stations A and B will be explained as an example. A sent from station A
−+B communication line is received at B station, and A→
Measure the line quality of B, configure control information to use this line quality as a reference value, and send this control information to station A using the communication line of B-+A, and from station A to station B. The transmission power of the line from A to B is controlled based on the control information sent from the controller. Regarding the communication line of B-+A, the above-mentioned A-+
Similarly to the communication line of B, the transmission power of station B is controlled so that the line quality becomes the standard.
制御情報の返送は、例えば逆方向チャネルの同期信号を
変調して行なう。The control information is returned by modulating a reverse channel synchronization signal, for example.
第２図は、本発明による送信電力制御方式を用いた地球
局の例を示したものである。本図において、入力端子３
より入力される送信データ信号は、誤り訂正符号化回路
４で符号化され、送信論理回路５で同期信号が挿入され
る。送信論理回路５で挿入される同期信号は、後述する
送信制御回路６から送出される相手局の送信電力を制御
するための制御情報により変調される。制御情報で変調
された同期信号が挿入されたデータ信号は、変調回路７
により変調され、変調波は後述する受信制御論理回路８
より送出される制御信号により、制御される可変減衰回
路９により制御され、さらに送信周波数変換回路１０、
送信電力増幅回路１１、送受分波器１２およびアンテナ
１３を経て衛星へ送出される。FIG. 2 shows an example of an earth station using the transmission power control method according to the present invention. In this diagram, input terminal 3
The transmission data signal inputted from the transmission data signal is encoded by an error correction encoding circuit 4, and a synchronization signal is inserted by a transmission logic circuit 5. The synchronization signal inserted by the transmission logic circuit 5 is modulated by control information for controlling the transmission power of the partner station sent from the transmission control circuit 6, which will be described later. The data signal into which the synchronization signal modulated with the control information is inserted is sent to the modulation circuit 7.
The modulated wave is modulated by a reception control logic circuit 8, which will be described later.
The transmission frequency conversion circuit 10 is controlled by a variable attenuation circuit 9 controlled by a control signal sent from a transmission frequency conversion circuit 10,
The signal is transmitted to the satellite via the transmission power amplifier circuit 11, the transmission/reception duplexer 12, and the antenna 13.
アンテナ１３で受信された衛星からの信号は、送受分波
器１２、受信電力増幅回路１４および受信周波数変換回
路１５を経て復調回路１６で復調され、つぎに、受信論
理回路１７において同期信号が分離され。The signal from the satellite received by the antenna 13 is demodulated by the demodulation circuit 16 via the transmission/reception splitter 12, the reception power amplifier circuit 14, and the reception frequency conversion circuit 15, and then the synchronization signal is separated in the reception logic circuit 17. It is.
データ信号は誤り訂正復号化回路１８へ送出される。The data signal is sent to error correction decoding circuit 18.
受信論理回路１７では、上記以外に同期信号から相手局
より送られる自局の送信電力を制御するための制御情報
が復調され、この制御情報は受信制御論理回路８へ送出
され、送信電力の制御レベルが判定され、制御レベルに
対応する制御信号が可変減衰器９へ送られ自局の送信電
力が制御される。In addition to the above, the reception logic circuit 17 demodulates control information for controlling the transmission power of the own station sent from the synchronization signal from the other station, and this control information is sent to the reception control logic circuit 8 to control the transmission power. The level is determined, and a control signal corresponding to the control level is sent to the variable attenuator 9 to control the transmission power of the own station.
受信論理回路１７からのデータ信号は、誤り訂正復号化
回路１８において復号され、復号される際に発生する誤
りパルスを計測することにより回線品質を検出し、送信
制御論理回路６において前述の検出された回線品質より
相手局の送信電力制御レベルを決定し、制御レベルに対
応する制御情報を構成し送信論理回路５へ送出する。な
お、誤り訂正復号化回路１８で復号化されたデータは、
出力端子１９より受信データとして出力される。The data signal from the reception logic circuit 17 is decoded in the error correction decoding circuit 18, and the line quality is detected by measuring the error pulses generated during decoding. The transmission power control level of the other station is determined based on the line quality obtained, and control information corresponding to the control level is configured and sent to the transmission logic circuit 5. Note that the data decoded by the error correction decoding circuit 18 is
The data is output from the output terminal 19 as received data.
ツキに、制御情報の構成および伝送方法の例について詳
細に説明する。誤り訂正復号化回路１８で、復号化する
際に発生する誤りパルスを計測して得られた回線品質情
報は、送信制御論理回路６に送られ、第３図の例に示す
ような回線品質しきい値と比較し、対応する相手局の送
信電力の制御レベルを決定し、第４図の例に示されるよ
うな制御しベルに対応する符号列が制御情報として送信
論理回路５へ送られる。送信論理回路５で挿入される同
期信号は、第５図のフレーム構成例に示すようにＳＯＪ
、ＳＯＭ［より成り、制御情報の各ピッド１”または”
０″に応じてＳＯＭＩ［の極性を反転し、このようにし
て制御情報で同期信号を変調し相手局へ伝送する。一方
受信側では、受信論理回路１７で同期信号を分離し、Ｓ
ＯＭ［の極性を識別して制御情報を再生し、受信制御論
理回路８において第４図の例に示されるように制御レベ
ルを判定し、この制御レベルに対応する制御信号を可変
減衰器９へ送出し、減衰量を変化して送信電力を制御す
る。First, an example of the configuration and transmission method of control information will be explained in detail. Line quality information obtained by measuring error pulses generated during decoding in the error correction decoding circuit 18 is sent to the transmission control logic circuit 6, and the line quality information is determined as shown in the example in FIG. The control level of the transmission power of the corresponding partner station is determined by comparison with the threshold value, and a code string corresponding to the control bell as shown in the example of FIG. 4 is sent to the transmission logic circuit 5 as control information. The synchronization signal inserted by the transmission logic circuit 5 is an SOJ signal as shown in the frame structure example of FIG.
, SOM [consisting of control information for each pit 1" or "
0'', the polarity of SOMI[ is inverted, and in this way, the synchronization signal is modulated with the control information and transmitted to the other station.On the receiving side, the reception logic circuit 17 separates the synchronization signal, and the
The control information is reproduced by identifying the polarity of OM [, the control level is determined in the reception control logic circuit 8 as shown in the example of FIG. 4, and the control signal corresponding to this control level is sent to the variable attenuator 9. The transmission power is controlled by changing the amount of transmission and attenuation.
（発明の効果）
以上説明したように、受信局で回線品質を測定し、回線
品質が常時基準値となるように送信電力を制御している
から、衛星の送信出力を有効に利用できる。回線品質を
検出するために誤・り訂正符号を用いており、この方法
によれば、比較的短時間に回線品質を検出できる特徴を
有しており、電話１チャネル程度の低速ビットレートの
通信方式にも有効である。また、通信回線の同期信号を
変調して制御情報を伝送しているので、双方向の通信に
おいては制御情報を伝送するための専用の制御回線が不
用となる利点がある。(Effects of the Invention) As explained above, since the receiving station measures the line quality and controls the transmission power so that the line quality is always at the reference value, the satellite's transmission output can be used effectively. Error/error correction codes are used to detect line quality, and this method has the feature of detecting line quality in a relatively short period of time, allowing communication at a low bit rate of about the same speed as one telephone channel. It is also effective for methods. Furthermore, since the control information is transmitted by modulating the synchronization signal of the communication line, there is an advantage that a dedicated control line for transmitting the control information is not required in bidirectional communication.
本発明は前述したような特徴を有しており、降雨減衰の
影響を大きく受ける単ミリ波帯を使用し１台の衛星中継
器を利用して、多数の地球局間に５ｃｐｃ方式で電【チ
ャネルを単位に回線を設定する衛星通信方式にきわめて
有効である。特に、衛星の送信出力を有効に利用でき、
回線容量の増大をはかることができる。The present invention has the above-mentioned characteristics, and uses the single millimeter wave band, which is greatly affected by rain attenuation, to transmit electricity between a large number of earth stations in a 5 cpc method using a single satellite repeater. This is extremely effective for satellite communication systems that set up lines on a channel-by-channel basis. In particular, the satellite's transmission output can be used effectively,
It is possible to increase line capacity.
第１図は本発明を適用する衛星通信方式の構成例、第２
図は本発明による送信電力制御方式を用いた地球局の構
成例、第３図は回線品質と制御レベルの対応例を示す図
、第４図は制御レベルと制御情報の対応例を示す図、第
５図はフレーム構成の例を示す図である。
１は衛星中継器、２は地球局、３は入力端子、４は−り
訂正符号化回路、５は送信論理回路、６は送信制御論理
回路、７は変調回路、８は受信制御論理回路、９は可変
減衰回路、１０は送信周波数変換回路、１１は送信電力
増幅回路、１２は送受分波器、１３はアンテナ、１４は
受信電力増幅回路、１５は受信周波数変換回路、１６は
復調回路、１７は受信論理回路、１８は誤り訂正復号化
回路、１９は出力端子である。
特許出願人
日本電信電話公社
特許出願代理人
弁理士 山 本 恵 −Figure 1 shows an example of the configuration of a satellite communication system to which the present invention is applied;
The figure shows an example of the configuration of an earth station using the transmission power control method according to the present invention, FIG. 3 shows an example of correspondence between line quality and control level, and FIG. 4 shows an example of correspondence between control level and control information. FIG. 5 is a diagram showing an example of a frame structure. 1 is a satellite repeater, 2 is an earth station, 3 is an input terminal, 4 is a correction encoding circuit, 5 is a transmission logic circuit, 6 is a transmission control logic circuit, 7 is a modulation circuit, 8 is a reception control logic circuit, 9 is a variable attenuation circuit, 10 is a transmission frequency conversion circuit, 11 is a transmission power amplifier circuit, 12 is a transmission/reception duplexer, 13 is an antenna, 14 is a reception power amplifier circuit, 15 is a reception frequency conversion circuit, 16 is a demodulation circuit, 17 is a reception logic circuit, 18 is an error correction decoding circuit, and 19 is an output terminal. Patent applicant Nippon Telegraph and Telephone Public Corporation Patent application agent Megumi Yamamoto −
Claims (1)
において、受信局で誤まり訂正復号する際に発見する伝
送誤りの数を計測することにより回線品質を推定し、当
該受信局で、回線品質を予め定める基準とするために必
要な送信局の送信電力制御のための制御情報を構成し、
該制御情報を受信局より送信局に逆方向の通信チャネル
を介して返送し、送信局では返送された制御情報に従っ
て送信電力を制御することを特徴とする、衛星通信にお
ける送信電力制御方式。In a method of digital communication between earth stations via satellite, line quality is estimated by measuring the number of transmission errors discovered during error correction decoding at the receiving station. Configure control information for transmitting power control of the transmitting station necessary to make the predetermined standard,
A transmission power control method in satellite communication, characterized in that the control information is returned from a receiving station to a transmitting station via a reverse communication channel, and the transmitting station controls transmission power according to the returned control information.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2525082A JPS58143635A (en) | 1982-02-20 | 1982-02-20 | Transmission power controlling system of satellite communication |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2525082A JPS58143635A (en) | 1982-02-20 | 1982-02-20 | Transmission power controlling system of satellite communication |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58143635A true JPS58143635A (en) | 1983-08-26 |
| JPS6342447B2 JPS6342447B2 (en) | 1988-08-23 |
Family
ID=12160740
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2525082A Granted JPS58143635A (en) | 1982-02-20 | 1982-02-20 | Transmission power controlling system of satellite communication |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58143635A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6259426A (en) * | 1985-09-10 | 1987-03-16 | Fujitsu Ltd | Wireless communication control system |
| JPH0389726A (en) * | 1989-09-01 | 1991-04-15 | Nec Corp | Line quality compensation system |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0536755Y2 (en) * | 1988-09-12 | 1993-09-17 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54101616A (en) * | 1978-01-27 | 1979-08-10 | Nippon Telegr & Teleph Corp <Ntt> | Satellite communication system |
| JPS55133147A (en) * | 1979-04-04 | 1980-10-16 | Nippon Telegr & Teleph Corp <Ntt> | Satellite communication system |
-
1982
- 1982-02-20 JP JP2525082A patent/JPS58143635A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54101616A (en) * | 1978-01-27 | 1979-08-10 | Nippon Telegr & Teleph Corp <Ntt> | Satellite communication system |
| JPS55133147A (en) * | 1979-04-04 | 1980-10-16 | Nippon Telegr & Teleph Corp <Ntt> | Satellite communication system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6259426A (en) * | 1985-09-10 | 1987-03-16 | Fujitsu Ltd | Wireless communication control system |
| JPH0389726A (en) * | 1989-09-01 | 1991-04-15 | Nec Corp | Line quality compensation system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6342447B2 (en) | 1988-08-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4261054A (en) | Real-time adaptive power control in satellite communications systems | |
| US5511079A (en) | Apparatus and method for controlling forward error correction encoding in a very small aperture terminal | |
| US4228538A (en) | Real-time adaptive power control in satellite communications systems | |
| US5257397A (en) | Mobile data telephone | |
| US4004224A (en) | Method for fade correction of communication transmission over directional radio paths | |
| US7684435B2 (en) | Base station system for mobile communication | |
| US5862141A (en) | Variable bitrate radio modem system to enhance data transmission and reduce error rates | |
| WO1998056120A3 (en) | Transmit power control in a radio communication system | |
| EP1865741A3 (en) | Method and apparatus for providing high speed data communication in a cellular environment | |
| AU1295792A (en) | A demodulator/modulator apparatus | |
| JP3252487B2 (en) | Cellular radio telephone system | |
| US6345183B1 (en) | Signalling method and a digital radio system | |
| US6252898B1 (en) | Spread spectrum communication method and system wherein data rate of data to be transmitted is changed in accordance with transmission quality | |
| KR20010082762A (en) | Signalling method and telecommunication system | |
| EP0798879A2 (en) | Demand-assigned satellite communications system | |
| JPS58143635A (en) | Transmission power controlling system of satellite communication | |
| JP3657850B2 (en) | Multicast transmission downlink transmission power control method and base station | |
| US3962638A (en) | Data transmission over voice bandwidth of FM radio channel | |
| JP4087948B2 (en) | Code division multiplexing mobile communication device | |
| JP2001217765A (en) | High bit rate and low bit rate transmitting method for remote control link of satellite | |
| JPS63173426A (en) | Transmission power control equipment | |
| JPH03198546A (en) | Satellite communication system | |
| JP2805768B2 (en) | Satellite communication transceiver | |
| JPH0129453B2 (en) | ||
| JP2904127B2 (en) | Transmission power control method in satellite communication |