JPH05114878A - Transmission power control system for transponders - Google Patents
Transmission power control system for transpondersInfo
- Publication number
- JPH05114878A JPH05114878A JP3299592A JP29959291A JPH05114878A JP H05114878 A JPH05114878 A JP H05114878A JP 3299592 A JP3299592 A JP 3299592A JP 29959291 A JP29959291 A JP 29959291A JP H05114878 A JPH05114878 A JP H05114878A
- Authority
- JP
- Japan
- Prior art keywords
- transponder
- transmission power
- power control
- station
- correction value
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Landscapes
- Radio Relay Systems (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、複数トランスポンダを
用いた送信電力制御方式において、トランスポンダ毎の
動作特性差を地球局の送信側で補正し、各トランスポン
ダを最適点で動作させる技術に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission power control system using a plurality of transponders, and relates to a technique for operating each transponder at an optimum point by correcting the operating characteristic difference of each transponder on the transmitting side of an earth station. is there.
【０００２】[0002]
【従来の技術】送信電力制御方式は、アップリンクにお
ける降雨減衰量を補償してトランスポンダへの到達電力
を降雨減衰量に依らず一定とするもので、干渉の軽減、
回線品質の改善に有効であることが知られている。従来
の送信電力制御方式をＴＤＭＡ通信に適用した場合の構
成例を図５に示す。2. Description of the Related Art The transmission power control system compensates for the amount of rain attenuation in the uplink and makes the power reaching the transponder constant regardless of the amount of rain attenuation, thus reducing interference.
It is known to be effective in improving line quality. FIG. 5 shows a configuration example when the conventional transmission power control method is applied to TDMA communication.
【０００３】基準局１では、図６に示すような受信同期
トランスポンダ（Ｔ１）のキャリア（Ｆ１）を介した基
準局同期（Ｒ）バーストを用いた自局クローズドループ
により、減衰量検出部２でアップリンクにおける降雨減
衰量を推定し送信電力制御量３を算出し、該制御量に基
づき送信電力制御部４で自局送信電力を制御する。受信
同期トランスポンダ以外のトランスポンダ（Ｔ２〜Ｔ
３）についても受信同期トランスポンダと同様の送信電
力制御量３に基づき送信電力制御部４で自局送信電力を
制御する。[0003] In the reference station 1, the attenuation amount detecting section 2 uses the closed loop of the reference station synchronization (R) burst via the carrier (F1) of the reception synchronization transponder (T1) as shown in FIG. The amount of rain attenuation is estimated, the transmission power control amount 3 is calculated, and the transmission power control unit 4 controls the own station transmission power based on the control amount. Transponders other than the reception synchronization transponder (T2 to T
Regarding 3), the transmission power control unit 4 controls the transmission power of its own station based on the transmission power control amount 3 similar to that of the reception synchronous transponder.
【０００４】また、基準局１では、各従局の送出した従
局同期（Ｎ）バーストを監視し、減衰量検出部２でアッ
プリンクにおける降雨減衰量を推定し送信電力制御量３
を算出し、該制御量を制御回線で全従局へ送る。従局１
１では、制御回線で送られた制御量１３に基づいて送信
電力制御部１４で送信電力を制御する。自局の従局同期
（Ｎ）バーストを送出していないトランスポンダ（Ｔ２
〜Ｔ３）についても自局の従局同期（Ｎ）バーストを送
出しているトランスポンダと同様の送信電力制御量によ
り送信電力制御部１４で送信電力を制御する。Further, the reference station 1 monitors the slave station synchronization (N) bursts sent from each slave station, and the attenuation amount detecting section 2 estimates the rain attenuation amount in the uplink and the transmission power control amount 3
Is calculated and the control amount is sent to all slave stations via the control line. Slave 1
In 1, the transmission power control unit 14 controls the transmission power based on the control amount 13 sent through the control line. The transponder (T2) that is not transmitting its own slave synchronization (N) burst
For T3 to T3), the transmission power control unit 14 controls the transmission power by the same transmission power control amount as the transponder transmitting the slave station synchronization (N) burst of its own station.
【０００５】[0005]
【発明が解決しようとする課題】この方式では、送信電
力制御量を算出しているトランスポンダに対しては、最
適点で動作しているが、図７に示すように各トランスポ
ンダで動作特性が異なる場合には、他のトランスポンダ
では最適動作点とはならない欠点がある。図７で最適入
力ＩO と飽和入力ＩS とは、各トランスポンダ毎に相違
する。In this system, the transponders for which the transmission power control amount is calculated operate at the optimum point, but the transponders have different operation characteristics as shown in FIG. In some cases, other transponders have the drawback of not being the optimum operating point. In FIG. 7, the optimum input I O and the saturation input I S differ for each transponder.
【０００６】本発明の目的は、複数トランスポンダを用
いた送信電力制御方式において、トランスポンダ間の動
作点の差を地球局の送信側で補正し、全てのトランスポ
ンダを最適動作点で動作させることである。An object of the present invention is, in a transmission power control system using a plurality of transponders, to correct differences in operating points between transponders on the transmitting side of an earth station so that all transponders operate at optimal operating points. ..
【０００７】[0007]
【課題を解決するための手段】本発明の特徴は、複数地
球局から複数トランスポンダを介して複数のキャリアを
用いた通信を行う衛星通信方式で、アップリンクにおけ
る降雨減衰量を補償してトランスポンダへの到達電力を
降雨減衰量に依らず一定とする送信電力制御方式におい
て、各地球局で各トランスポンダの入出力特性を測定
し、特定のトランスポンダの動作点とそれに対応する他
のトランスポンダの動作点の差をトランスポンダ間補正
値として求め、前記特定トランスポンダを用いた自局の
送信電力制御量を求め、該送信電力制御量に前記トラン
スポンダ間補正値を加え、各トランスポンダの送信電力
制御値とし、トランスポンダ毎に地球局から衛星への送
信電力を制御する複数トランスポンダの送信電力制御方
式にある。A feature of the present invention is a satellite communication system in which communication is performed from a plurality of earth stations via a plurality of transponders using a plurality of carriers, and a rainpond attenuation amount in an uplink is compensated to a transponder. In the transmission power control method that makes the reaching power of the transmission power constant regardless of the amount of rainfall attenuation, the input / output characteristics of each transponder are measured at each earth station, and the operating point of a specific transponder and the operating points of other transponders corresponding to it are measured. The difference is obtained as a transponder correction value, the transmission power control amount of the own station using the specific transponder is obtained, the intertransponder correction value is added to the transmission power control amount, and the transmission power control value of each transponder is set. It is a transmission power control method of multiple transponders that controls the transmission power from the earth station to the satellite.
【０００８】[0008]
【作用】本発明は、地球局で、各トランスポンダの動作
点を測定し、トランスポンダ毎の動作特性の差を地球局
の送信側で補正する。従来の技術に比べ、各トランスポ
ンダを最適点で動作させることが可能であり、干渉の軽
減、回線品質の改善ができる。According to the present invention, the operating point of each transponder is measured at the earth station, and the difference in the operating characteristics of each transponder is corrected at the transmitting side of the earth station. Compared with the conventional technique, each transponder can be operated at the optimum point, and interference can be reduced and line quality can be improved.
【０００９】[0009]
【実施例１】図１は、本発明の第１の実施例であり、次
のように動作する。First Embodiment FIG. 1 is a first embodiment of the present invention and operates as follows.
【００１０】晴天時にトランスポンダの動作特性を測定
する。動作点測定部６から送信電力制御部４への指示に
より送信電力を変化させ衛星２０への入力電力を変化さ
せる。衛星２０で折り返された自局クローズドループ信
号を受信し、受信信号の受信電力を動作点測定部６で測
定し、図２に示す様な送信電力対受信電力のトランスポ
ンダの動作特性（入出力特性）をとる。該動作特性よ
り、受信電力（即ち、トランスポンダの出力電力）の飽
和点から所定のバックオフをとり最適出力電力を決め、
該最適出力電力より最適入力電力（即ち、最適動作点）
を求める。送信電力を有効に使用しかつ歪等の回線品質
を所望値にするには、飽和出力から一定値だけ下げた点
での動作（バックオフ）が必要である。上記測定を全て
のトランスポンダについて行い、受信同期トランスポン
ダとの最適動作点の差をトランスポンダ間補正値とす
る。本補正値の較正は定期的に行う。The operating characteristics of the transponder are measured in fine weather. According to an instruction from the operating point measurement unit 6 to the transmission power control unit 4, the transmission power is changed and the input power to the satellite 20 is changed. The local station closed loop signal returned by the satellite 20 is received, the received power of the received signal is measured by the operating point measurement unit 6, and the operating characteristics (input / output characteristics) of the transponder of the transmission power versus the reception power as shown in FIG. ). From the operating characteristics, a predetermined backoff is taken from the saturation point of the reception power (that is, the output power of the transponder) to determine the optimum output power,
Optimal input power (that is, optimal operating point) than the optimal output power
Ask for. In order to effectively use the transmission power and bring the line quality such as distortion to a desired value, an operation (back-off) at a point where the saturated output is lowered by a certain value is necessary. The above measurement is performed for all transponders, and the difference between the optimum operating point and the reception synchronous transponder is used as the inter-transponder correction value. This correction value is calibrated regularly.
【００１１】受信同期トランスポンダのキャリア（例え
ば、図７のＴ１のＦ１キャリア）を介した自局バースト
を用いた自局クローズドループにより、減衰量検出部２
でアップリンクにおける降雨減衰量を推定し送信電力制
御量３を算出する。該制御量に上記測定により求めたト
ランスポンダ間補正値を加え送信電力制御値とし、該送
信電力制御値により送信電力制御部４で自局送信電力を
制御する。本方式によれば、基準となるトランスポンダ
である受信同期トランスポンダ以外のトランスポンダ
（Ｔ２〜Ｔ３）についても、トランスポンダ間補正値を
加えることにより最適動作点で動作することが可能であ
る。The attenuation detecting unit 2 is provided by the closed loop of the own station using the own station burst through the carrier of the reception synchronous transponder (for example, the F1 carrier of T1 in FIG. 7).
Then, the amount of rain attenuation in the uplink is estimated and the transmission power control amount 3 is calculated. The inter-ponder correction value obtained by the above measurement is added to the control amount to obtain a transmission power control value, and the transmission power control unit 4 controls the transmission power of its own station by the transmission power control value. According to this method, transponders (T2 to T3) other than the reception synchronization transponder that is the reference transponder can also operate at the optimum operating point by adding the transponder correction value.
【００１２】[0012]
【実施例２】図３は、本発明の第２の実施例であり、次
のように動作する。Second Embodiment FIG. 3 shows a second embodiment of the present invention and operates as follows.
【００１３】基準局１において、前記実施例１と同様に
動作点測定部でトランスポンダ間補正値を求める。該ト
ランスポンダ間補正値を制御回線を介して全従局に送出
する。In the reference station 1, the inter-transponder correction value is obtained by the operating point measuring section as in the first embodiment. The inter-transponder correction value is sent to all slave stations via the control line.
【００１４】各従局１１では、自局の従局同期（Ｎ）バ
ーストを送出しているトランスポンダ（例えば、図７の
Ｔ２）の補正値と他のトランスポンダ補正値との偏差を
改めてトランスポンダ間補正値１６とする。また、自局
の送出した従局同期（Ｎ）バーストを用いた自局クロー
ズドループにより、減衰量検出部１５でアップリンクに
おける降雨減衰量を推定し送信電力制御量１３を算出す
る。該制御量１３に上記トランスポンダ間補正値１６を
加え送信電力制御値とし、該送信電力制御値に基づき送
信電力制御部１４で自局送信電力を制御する。本方式に
よれば、自局の従局同期（Ｎ）バーストを送出している
トランスポンダ以外のトランスポンダ（Ｔ１、Ｔ３）に
ついても、トランスポンダ間補正値を加えることにより
最適動作点で動作することが可能である。In each slave station 11, the deviation between the correction value of the transponder (for example, T2 in FIG. 7) transmitting the slave station synchronization (N) burst of the slave station and the correction value of other transponders is corrected again between transponders 16 And In addition, the attenuation amount detecting unit 15 estimates the rainfall attenuation amount in the uplink and calculates the transmission power control amount 13 by the own station closed loop using the slave station synchronization (N) burst transmitted from the own station. The transponder correction value 16 is added to the control amount 13 to obtain a transmission power control value, and the transmission power control unit 14 controls the transmission power of the own station based on the transmission power control value. According to this method, transponders (T1, T3) other than the transponder transmitting the slave synchronization (N) burst of its own station can operate at the optimum operating point by adding the inter-transponder correction value. is there.
【００１５】[0015]
【実施例３】図４は、本発明の第３の実施例であり、次
にように動作する。Third Embodiment FIG. 4 shows a third embodiment of the present invention, which operates as follows.
【００１６】基準局１において、実施例１と同様に動作
点測定部でトランスポンダ間補正値を求める。該トラン
スポンダ間補正値を制御回線を介して全従局に送出す
る。また、各従局の送出した従局同期（Ｎ）バーストを
監視し、減衰量検出部２で従局毎のアップリンクにおけ
る降雨減衰量を推定し送信電力制御量３を算出し、該制
御量を制御回線を介して全従局へ送出する。In the reference station 1, the inter-transponder correction value is obtained by the operating point measuring unit as in the first embodiment. The inter-transponder correction value is sent to all slave stations via the control line. Also, the slave station synchronization (N) burst sent from each slave station is monitored, the attenuation amount detector 2 estimates the rain attenuation amount in the uplink for each slave station, calculates the transmission power control amount 3, and controls the control amount. To all slave stations via.
【００１７】従局１１では、自局の従局同期（Ｎ）バー
ストを送出しているトランスポンダ（例えば、Ｔ２）の
補正値と他のトランスポンダ補正値との偏差を改めてト
ランスポンダ間補正値１６とする。制御回線で送られた
制御量１３に上記トランスポンダ間補正値１６を加え送
信電力制御値とし、該送信電力制御値に基づき送信電力
制御部１４で自局送信電力を制御する。本方式によれ
ば、自局の従局同期（Ｎ）バーストを送出しているトラ
ンスポンダ以外のトランスポンダ（Ｔ１、Ｔ３）につい
ても、トランスポンダ間補正値を加えることにより最適
動作点で動作することが可能である。In the slave station 11, the deviation between the correction value of the transponder (for example, T2) transmitting the slave station synchronization (N) burst of the slave station and the other transponder correction value is set as the inter-transponder correction value 16 again. The transponder correction value 16 is added to the control amount 13 sent through the control line to obtain a transmission power control value, and the transmission power control unit 14 controls the transmission power of the own station based on the transmission power control value. According to this method, transponders (T1, T3) other than the transponder transmitting the slave synchronization (N) burst of its own station can operate at the optimum operating point by adding the inter-transponder correction value. is there.
【００１８】[0018]
【発明の効果】以上説明したように本発明によれば、複
数トランスポンダを用いた送信電力制御においても、特
定地球局（基準局）で、各トランスポンダの動作点を測
定し、トランスポンダ毎の動作特性差を地球局の送信側
で補正することにより、全てのトランスポンダを最適動
作点で動作させることが可能であり、干渉の軽減、回線
品質の改善ができる。As described above, according to the present invention, even in the transmission power control using a plurality of transponders, the operating point of each transponder is measured at the specific earth station (reference station), and the operating characteristic difference between the transponders is measured. Is corrected at the transmitting side of the earth station, all transponders can be operated at the optimum operating point, interference can be reduced, and line quality can be improved.
【図１】本発明の第１の実施例を示す。FIG. 1 shows a first embodiment of the present invention.
【図２】トランスポンダの動作特性を示す。FIG. 2 shows the operating characteristics of a transponder.
【図３】本発明の第２の実施例を示す。FIG. 3 shows a second embodiment of the present invention.
【図４】本発明の第３の実施例を示す。FIG. 4 shows a third embodiment of the present invention.
【図５】従来の送信電力制御方式を示す。FIG. 5 shows a conventional transmission power control method.
【図６】複数トランスポンダを用いた場合のＴＤＭＡフ
レーム構成を示す。FIG. 6 shows a TDMA frame structure when using multiple transponders.
【図７】トランスポンダの動作特性の相違を示す。FIG. 7 shows a difference in operating characteristics of transponders.
１ 基準局 ２ 減衰量演算部 ３ 制御量 ４ 送信電力制御部 ５ 合成部 ６ 動作点測定部 ７ 補正値 １１ 従局 １２ 分離部 １３ 制御量 １４ 送信電力制御部 １５ 減衰量検出部 １６ 補正値 ２０ 衛星 Ｔ１、Ｔ２、Ｔ３ トランスポンダ番号 Ｆ１〜Ｆ６ キャリア番号 Ｒ 基準局同期バースト Ｎ 従局同期バースト Ｄ データバースト 1 Reference station 2 Attenuation amount calculation unit 3 Control amount 4 Transmission power control unit 5 Synthesis unit 6 Operating point measurement unit 7 Correction value 11 Slave station 12 Separation unit 13 Control amount 14 Transmission power control unit 15 Attenuation amount detection unit 16 Correction value 20 Satellite T1 , T2, T3 Transponder number F1 to F6 Carrier number R Reference station synchronization burst N Slave station synchronization burst D Data burst
Claims (3)
して複数のキャリアを用いた通信を行う衛星通信方式
で、アップリンクにおける降雨減衰量を補償してトラン
スポンダへの到達電力を降雨減衰量に依らず一定とする
送信電力制御方式において、 各地球局で各トランスポンダの入出力特性を測定し、特
定のトランスポンダの動作点とそれに対応する他のトラ
ンスポンダの動作点の差をトランスポンダ間補正値とし
て求め、前記特定トランスポンダを用いた自局の送信電
力制御量を求め、該送信電力制御量に前記トランスポン
ダ間補正値を加え、各トランスポンダの送信電力制御値
とし、トランスポンダ毎に地球局から衛星への送信電力
を制御することを特徴とする複数トランスポンダの送信
電力制御方式。1. A satellite communication system in which communication is performed from a plurality of earth stations via a plurality of transponders using a plurality of carriers, and the amount of rain attenuation in the uplink is compensated for so that the power reaching the transponder does not depend on the amount of rain attenuation. In the constant transmission power control method, the input / output characteristics of each transponder are measured at each earth station, and the difference between the operating point of the specific transponder and the corresponding operating point of the other transponder is obtained as a transponder correction value, Obtain the transmission power control amount of the own station using a specific transponder, add the transponder correction value to the transmission power control amount, the transmission power control value of each transponder, the transmission power from the earth station to the satellite for each transponder A transmission power control method for multiple transponders characterized by controlling.
求め、該トランスポンダ間補正値を全地球局に定期的に
送出し、各地球局では、自局で求めた送信電力制御量に
前記トランスポンダ間補正値を加え、各トランスポンダ
の送信電力制御値とし、トランスポンダ毎の送信電力を
制御することを特徴とする請求項１記載の複数トランス
ポンダの送信電力制御方式。2. A trans-ponder correction value is obtained by a specific earth station, and the inter-transponder correction value is periodically sent to all earth stations. Each earth station uses the transmission power control amount obtained by itself as the inter-transponder inter-transponder control amount. The transmission power control method for a plurality of transponders according to claim 1, wherein a transmission power control value for each transponder is controlled by adding a correction value to the transmission power control value.
各地球局の送信電力制御量を求め、該トランスポンダ間
補正値と各地球局毎の送信電力制御量を全地球局に送出
し、各地球局では、前記送信電力制御量に前記トランス
ポンダ間補正値を加え、各トランスポンダの送信電力制
御値とし、トランスポンダ毎の送信電力を制御すること
を特徴とする請求項１記載の複数トランスポンダの送信
電力制御方式。3. A correction value between transponders and a transmission power control amount of each earth station are obtained at a specific earth station, and the correction value between transponders and the transmission power control amount of each earth station are sent to all earth stations, and The transmission power control of a plurality of transponders according to claim 1, wherein the station controls the transmission power of each transponder by adding the inter-transponder correction value to the transmission power control amount to obtain a transmission power control value of each transponder. method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3299592A JP2699725B2 (en) | 1991-10-21 | 1991-10-21 | Transmission power control method for multiple transponders |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3299592A JP2699725B2 (en) | 1991-10-21 | 1991-10-21 | Transmission power control method for multiple transponders |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05114878A true JPH05114878A (en) | 1993-05-07 |
| JP2699725B2 JP2699725B2 (en) | 1998-01-19 |
Family
ID=17874634
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3299592A Expired - Fee Related JP2699725B2 (en) | 1991-10-21 | 1991-10-21 | Transmission power control method for multiple transponders |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2699725B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0712214A3 (en) * | 1994-11-08 | 1996-07-24 | Loral Space Systems Inc | Satellite communication power management system |
-
1991
- 1991-10-21 JP JP3299592A patent/JP2699725B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0712214A3 (en) * | 1994-11-08 | 1996-07-24 | Loral Space Systems Inc | Satellite communication power management system |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2699725B2 (en) | 1998-01-19 |
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