JPS6342447B2 - - Google Patents
Info
- Publication number
- JPS6342447B2 JPS6342447B2 JP57025250A JP2525082A JPS6342447B2 JP S6342447 B2 JPS6342447 B2 JP S6342447B2 JP 57025250 A JP57025250 A JP 57025250A JP 2525082 A JP2525082 A JP 2525082A JP S6342447 B2 JPS6342447 B2 JP S6342447B2
- Authority
- JP
- Japan
- Prior art keywords
- transmission power
- station
- transmission
- control information
- line quality
- 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
Links
- 230000005540 biological transmission Effects 0.000 claims description 50
- 230000006854 communication Effects 0.000 claims description 23
- 238000004891 communication Methods 0.000 claims description 23
- 238000012937 correction Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 12
- 230000008054 signal transmission Effects 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000007175 bidirectional communication Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
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
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Radio Relay Systems (AREA)
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、回線品質が常時一定となるようにす
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 transmission power so that the line quality remains constant at all times.
（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。この方法では、
自局から衛星までのアツ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の補償は不可能であ
り、ダウンリンクの伝搬損失の変動を見込んで中
継器の送信出力を大きめに設定しておく必要があ
り、１台の中継器に複数の地球局が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
チヤネルを設け、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
自局から相手局までの回線品質を検出し、この回
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、デイ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ヤネルを設けることは困難
であり、また低速の測定用チヤネルを設けても高
速回線の品質測定はできないので、デイジタル信
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 own station via the satellite to the own station, and to measure the reception input level from the own station at the input point of the satellite repeater. There is a method of controlling the transmission power of the own station so that it is constant. in this way,
It only compensates for fluctuations in uplink propagation loss from the local station to the satellite, and cannot compensate for fluctuations in downlink propagation loss from the satellite to the other station. It is necessary to set the transmission output of the repeater to be high, and satellite communication systems in which multiple earth stations access one repeater using the FDM method have problems such as a reduction 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 own station to the other station via the other station, and the line quality from the own station to the other station is detected from these two line qualities, and this line quality is used as the standard. There is a method to control the transmission power so that the value is the same. However, in the satellite communication system that transmits 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, the quality of the high-speed line cannot be measured. 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、デイ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、
SCPC方式で１台の衛星中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) The present invention solves the following problems when transmitting a digital signal.
By adopting an error correction coding system, line quality is measured from error pulses generated during error correction decoding at the receiving station, and transmission power is controlled so that this line quality always becomes a reference value, The purpose is to improve the efficiency with which a large number of opposing earth stations utilize the transmission power of satellite repeaters and increase line capacity. The present invention includes, for example,
It can be suitably applied to a system in which a large number of earth stations access one satellite repeater using the SCPC system.
（発明の構成および作用） 以下図面を用いて本発明を詳細に説明する。(Structure and operation of the invention) The present invention will be explained 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つて説明
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。
制御情報の返送は、例えば逆方向チヤネルの同期
信号を変調して行なう。 FIG. 1 shows an example of the configuration of a satellite communication system to which the present invention is applied, in which 1 indicates one satellite repeater, and 2 indicates each earth station that accesses it. Communication between stations A and B will be explained as an example. The communication line from A to B transmitted from station A is B.
It is received at the station, the B station measures the line quality from A to B, configures control information to use this line quality as a reference value, and transmits this control information to the A station using the B to A communication line. Based on the control information sent from the B station, the A station controls the transmission power of the line from A to B. Regarding the B→A communication line, the transmission power of the B station is controlled in the same way as the A→B communication line described above so that the line quality becomes the standard.
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からの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に送
出される。送信制御論理回路６では相手局の送信
電力を制御するための制御情報を構成し、送信論
理回路５に送出する。送信論理回路５では同期信
号を制御情報で変調し、さらにこの同期信号を送
信データ信号に挿入する。送信データ信号は変調
器７において中間周波数の変調波となり、変調波
は受信制御論理回路８からの制御信号にもとづき
可変減衰回路９で送信レベルが制御され、さらに
送信周波数変換回路１０で高周波数信号に周波数
変換されたのちに、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 figure, a transmission data signal from an input terminal 3 is encoded by an error correction encoding circuit 4 and sent to a transmission logic circuit 5. The transmission control logic circuit 6 composes control information for controlling the transmission power of the partner station, and sends it to the transmission logic circuit 5. The transmission logic circuit 5 modulates the synchronization signal with control information and further inserts this synchronization signal into the transmission data signal. The transmission data signal becomes a modulated wave with an intermediate frequency in a modulator 7, the transmission level of the modulated wave is controlled in a variable attenuation circuit 9 based on a control signal from a reception control logic circuit 8, and then converted into a high frequency signal in a transmission frequency conversion circuit 10. After frequency conversion, the signal is sent to the satellite via a transmission power amplification circuit 11, a transmission/reception duplexer 12, and an antenna 13.
衛星を経由した相手局からの信号はアンテナ１
３、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を経たのちに、復調回
路１６で復調され、復調された受信データ信号は
受信論理回路１７に送出される。受信論理回路１
７では同期信号とデータ信号が分離され、同期信
号からは制御情報が復調され、データ信号は誤り
訂正復号化回路１８へまた制御情報は受信制御論
理回路８へそれぞれ送出される。受信制御論理回
路８では、制御情報から制御レベルを判定し、制
御レベルに対応する制御信号を可変減衰器９へ送
出する。データ信号は誤り訂正復号化回路１８で
復号され、出力端子１９より受信データとして出
力される。誤り訂正復号化回路１８では、復号す
る際に発生する誤りパルスを計測し、誤りパルス
数より回線品質を検出し、回線品質情報を送信制
御論理回路６に送出する。送信制御論理回路６で
は、回線品質情報にもとづき相手局送信電力の制
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。 The signal from the other station via the satellite is sent to antenna 1.
3. After passing through the transmitting/receiving duplexer 12, the receiving power amplifier circuit 14, and the receiving frequency converting circuit 15, it is demodulated by the demodulating circuit 16, and the demodulated receiving data signal is sent to the receiving logic circuit 17. Reception logic circuit 1
At 7, the synchronization signal and the data signal are separated, control information is demodulated from the synchronization signal, and the data signal is sent to the error correction decoding circuit 18 and the control information to the reception control logic circuit 8, respectively. The reception control logic circuit 8 determines the control level from the control information and sends a control signal corresponding to the control level to the variable attenuator 9. The data signal is decoded by the error correction decoding circuit 18 and outputted from the output terminal 19 as received data. The error correction decoding circuit 18 measures error pulses generated during decoding, detects line quality from the number of error pulses, and sends line quality information to the transmission control logic circuit 6. The transmission control logic circuit 6 determines the control level of the transmission power of the other station based on the line quality information, composes control information corresponding to the control level, and sends it to the transmission logic circuit 5.
つぎに、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
御レ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で捜入さ
れる同期信号は、第５図のフレーム構成例に示す
ようにSOM，SOMより成り、制御情報の各
ビツト“１”または“０”に応じてSOM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、SOM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。 Next, an example of the structure and transmission method of control information will be described in detail. Error correction decoding circuit 18
The line quality information obtained by measuring the error pulses generated during decoding is sent to the transmission control logic circuit 6.
and compares it with the line quality threshold as shown in the example in Figure 3, determines the control level of the transmission power of the corresponding partner station, and responds to the control level as shown in the example in Figure 4. The code string is sent to the transmission logic circuit 5 as control information. The synchronization signal searched by the transmission logic circuit 5 is composed of SOM and SOM, as shown in the frame structure example of FIG. In this way, the synchronization signal is modulated with the control information and transmitted to the other station. On the other hand, on the receiving side, the receiving logic circuit 17 separates the synchronization signal, identifies the polarity of the SOM and reproduces the control information, and the receiving control logic circuit 8 determines the control level as shown in the example of FIG. , a control signal corresponding to this control level is sent to the variable attenuator 9, and the amount of attenuation is changed to control the transmission power.
（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チヤネル程度の低速ビツ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 correction codes are used to detect line quality, and this method has the feature of being able to detect line quality in a relatively short period of time, and is suitable for low-speed bit rate communication systems such as one telephone channel. It is valid. 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準ミリ波帯を使用し
１台の衛星中継器を利用して、多数の地球局間に
SCPC方式で電話１チヤ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 sub-millimeter wave band, which is greatly affected by rain attenuation, to connect multiple earth stations using one satellite repeater.
This is extremely effective for satellite communication systems that use the SCPC method to set up lines for each telephone channel. especially,
The transmission output of the satellite can be used effectively and the line capacity can be increased.
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は誤り訂正符号化回路、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。
Figure 1 shows an example of the configuration of a satellite communication system to which the present invention is applied, Figure 2 shows an example of the configuration of an earth station using the transmission power control system of the present invention, and Figure 3 shows an example of correspondence between line quality and control level. FIG. 4 is a diagram showing an example of correspondence between control levels and control information, and 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 an error correction encoding circuit, 5 is a transmission logic circuit, 6
1 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 15 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.
Claims (1)
行なう際に、受信局で回線品質を推定し、回線品
質が予め定めた基準と一致するように送信局の送
信電力を制御するための制御情報を当該受信局で
構成し、該制御情報を送信局に返送し、送信局で
は返送された制御情報に従つて送信電力を制御す
る送信電力制御方式において、 通常データ送信用の通信チヤネルの信号伝送に
誤り訂正符号方式を採用し、受信局で当該通信チ
ヤネルの誤り訂正復号する際に発生する誤りパル
スの数を計測することにより前記回線品質の推定
を行うと共に、 前記制御情報を受信局より送信局に逆方向の通
常データ伝送用の通信チヤネルを介して返送する
ことを特徴とする衛星通信における送信電力制御
方式。 ２ 前記制御情報の返送は逆方向の通信チヤネル
の同期信号を変調して行う特許請求の範囲第１項
記載の衛星通信における送信電力制御方式。[Claims] 1. When performing digital communication between earth stations via a satellite, the receiving station estimates the line quality and adjusts the transmission power of the transmitting station so that the line quality matches a predetermined standard. In the transmission power control method, control information for control is configured at the receiving station, the control information is returned to the transmitting station, and the transmitting station controls the transmission power according to the returned control information. employing an error correction code system for signal transmission of the communication channel, and estimating the line quality by measuring the number of error pulses generated when error correction decoding of the communication channel is performed at the receiving station; A transmission power control method in satellite communication characterized by sending information from a receiving station back to a transmitting station via a communication channel for normal data transmission in the reverse direction. 2. The transmission power control system in satellite communication according to claim 1, wherein the control information is returned by modulating a synchronization signal of a communication channel in the opposite direction.
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 JPS58143635A (en) | 1983-08-26 |
| JPS6342447B2 true 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 (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0536755Y2 (en) * | 1988-09-12 | 1993-09-17 |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2546984B2 (en) * | 1985-09-10 | 1996-10-23 | 富士通株式会社 | Wireless communication control system |
| JPH0389726A (en) * | 1989-09-01 | 1991-04-15 | Nec Corp | Line quality compensation system |
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 (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0536755Y2 (en) * | 1988-09-12 | 1993-09-17 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58143635A (en) | 1983-08-26 |
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