JPS598454A - Transmission system of frame synchronizing signal - Google Patents
Transmission system of frame synchronizing signalInfo
- Publication number
- JPS598454A JPS598454A JP57117333A JP11733382A JPS598454A JP S598454 A JPS598454 A JP S598454A JP 57117333 A JP57117333 A JP 57117333A JP 11733382 A JP11733382 A JP 11733382A JP S598454 A JPS598454 A JP S598454A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- frame synchronization
- frame
- digital
- tone
- 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
Links
- 230000005540 biological transmission Effects 0.000 title claims abstract description 10
- 230000008054 signal transmission Effects 0.000 claims description 3
- 230000001360 synchronised effect Effects 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 8
- 238000005562 fading Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/04—Speed or phase control by synchronisation signals
- H04L7/06—Speed or phase control by synchronisation signals the synchronisation signals differing from the information signals in amplitude, polarity or frequency or length
- H04L7/065—Speed or phase control by synchronisation signals the synchronisation signals differing from the information signals in amplitude, polarity or frequency or length and superimposed by modulation
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の属する技術分野〕
本発明はマイクロ波ディジタル通信方式において、フレ
ーム同期信号をディジタル信号とは別に、フレーム同期
トーン信号に変換して伝送し、受信部において前記フレ
ーム同期トーン信号よυフレーム同期信号を再生するフ
レ−ム同期信号伝送方式に関するものである。Detailed Description of the Invention [Technical field to which the invention pertains] The present invention relates to a microwave digital communication system in which a frame synchronization signal is converted into a frame synchronization tone signal and transmitted separately from a digital signal, and a receiving section converts the frame synchronization tone signal into a frame synchronization tone signal and transmits the frame synchronization tone signal. This invention relates to a frame synchronization signal transmission system for reproducing synchronization tone signals and frame synchronization signals.
従来、この種の通信方式では、フレーム同期信号を別の
経路で伝送することは行わず、受信部において復調され
たディジタル主信号から、同じく復調されたタイミング
信号を手がかりにフレーム同期信号を抽出再生して、こ
れを受信部におけるディジタル主信号の論理演算の制御
位相補正等に使用する方法を用いている。このような装
置では、マイクロ波伝播路において周波数選択性フェー
ジングにより伝送帯域内の伝送歪が増加し、ついＫは復
調不能やフレーム同期はずれで回線断となると、フェー
ジングが回復して復調ディジタル信号が正常になっても
、本復調信号よりフレーム同期信号を再生しているため
フレーム同期引き込みすでに時間がかかり、その間は回
線断となった状態が続く。すなわちディジタル主信号が
復調不能□である時間に、フレーム同期引き込み完了ま
での時間が加算された期間は回線が断状態のままとなっ
てしまう。Conventionally, in this type of communication system, the frame synchronization signal was not transmitted through a separate route, but the frame synchronization signal was extracted and reproduced from the demodulated digital main signal in the receiving section using the demodulated timing signal as a clue. Then, a method is used in which this is used for control phase correction of logical operations of the digital main signal in the receiving section. In such equipment, transmission distortion within the transmission band increases due to frequency selective fading in the microwave propagation path, and when K eventually becomes disconnected due to inability to demodulate or frame synchronization, the fading recovers and the demodulated digital signal Even if the system becomes normal, the frame synchronization signal is regenerated from the main demodulated signal, so it takes time to pull in the frame synchronization, and the line remains disconnected during that time. That is, the line remains disconnected during the period in which the digital main signal is non-demodulated □ plus the time until frame synchronization is completed.
これらの欠点を補うために従来から、送信側で周波数安
定度のきわめて高いフレーム同期信号を使用し、受信側
におｈても再生不能となった場合に送信側のフレーム同
期信号とほぼ同じ周波数安定度のよいフレーム同期信号
を使用して、フレーム同期信号の信頼度を上げる方法が
ある。しかしこの方法は非常に高価な発振器が送信側お
よび受信側両方に必要となシ経済的でない。また上記の
ような方法を実施しても、さらにフレーム同期信号の再
生不能期間が長期間になると、やはシフレーム同期はず
れが起こる欠点があり、これらの問題点を完全に解決す
る方法ではない。In order to compensate for these drawbacks, the transmitting side has traditionally used a frame synchronization signal with extremely high frequency stability, and when the receiving side cannot reproduce the signal, it has a frequency that is almost the same as the frame synchronization signal on the transmitting side. There is a method of increasing the reliability of the frame synchronization signal by using a highly stable frame synchronization signal. However, this method is not economical as it requires very expensive oscillators on both the transmitting and receiving sides. Furthermore, even if the method described above is implemented, there is a drawback that frame synchronization may occur if the frame synchronization signal cannot be reproduced for a long period of time, so it is not a method that completely solves these problems. .
〔発明の目的〕
本発明は、これらの欠点を解決する本のでフレーム同期
信号の伝送信号を経済的に高信頼化して、ディジタル通
信回線を高品質化することを目的とする。[Object of the Invention] In order to solve these drawbacks, the present invention aims to economically improve the reliability of the transmission signal of the frame synchronization signal and to improve the quality of the digital communication line.
本発明は、主にフレーム同期引き込み期間の回線断を救
済するために、送信部においてフレーム同期信号を整数
（Ｎ）分の１に逓降して得られたフレーム同期トーン信
号により、搬送波を変調して送信し、受信部において復
調されたフレーム同期トーン信号からフレーム同期信号
を抽出再生し、仁の再生された信号によって復調ディジ
タル主信号のフレーム同期回路を制御して、フェージン
グ等によυディジタル主信号が復調不能となっても受信
部のフレーム信号を送信部のフレームと同期させること
ができるようにしたことを特徴とする。The present invention modulates a carrier wave with a frame synchronization tone signal obtained by downgrading a frame synchronization signal by an integer (N) in a transmitting section, mainly in order to relieve a line disconnection during a frame synchronization pull-in period. The receiving section extracts and reproduces the frame synchronization signal from the demodulated frame synchronization tone signal, and controls the frame synchronization circuit of the demodulated digital main signal with the regenerated signal to prevent the υ digital signal from fading, etc. The present invention is characterized in that the frame signal of the receiving section can be synchronized with the frame of the transmitting section even if the main signal cannot be demodulated.
以下図面について本発明の詳細な説明する。 The present invention will be described in detail below with reference to the drawings.
図は本発明の実施例のブロック構成図である。The figure is a block diagram of an embodiment of the present invention.
送信部では、入力ディジタル主信号は入力端子１を介し
てディジタル変調器３に接続されここで変調される。一
方、フレーム同期信号は入力端子２を介して分周器４に
接続されここで整数分の１に分周され、これによりフレ
ーム同期トーン信号５を得る。フレーム同期トーン信号
５はトーン信号変調器６で変調され、ディジタル変調器
３の出力とと本に混合器７で混合され空中線８を通して
送信される。In the transmitting section, the input digital main signal is connected via an input terminal 1 to a digital modulator 3, where it is modulated. On the other hand, the frame synchronization signal is connected to a frequency divider 4 via an input terminal 2, where the frequency is divided by an integer, thereby obtaining a frame synchronization tone signal 5. The frame synchronized tone signal 5 is modulated by a tone signal modulator 6, mixed with the output of the digital modulator 3 by a mixer 7, and transmitted through an antenna 8.
一方受信部では、空中線９で受信された変調波は復調器
１０で復調され、復調ディジタル主信号１１と復調フレ
ーム同期トーン信号１２を得る。復調フレーム同期トー
ン信号１２ Ｆｉフレーム同期信号再生器１３に加えら
れフレーム同期信号が抽出再生される。再生されたフレ
ーム同期信号は復調ディジタル主信号１１とともにフレ
ーム同期制御器１４に加えられ本フレーム同期信号によ
りディジタル主信号の図示しないフレーム同期時間標準
、伝播遅延時間調整等の制御が行われフレーム同期のと
れたディジタル信号出力が得られる。On the other hand, in the receiving section, the modulated wave received by the antenna 9 is demodulated by a demodulator 10 to obtain a demodulated digital main signal 11 and a demodulated frame synchronization tone signal 12. Demodulated frame synchronization tone signal 12 is applied to the Fi frame synchronization signal regenerator 13, and the frame synchronization signal is extracted and reproduced. The reproduced frame synchronization signal is applied to the frame synchronization controller 14 together with the demodulated digital main signal 11, and this frame synchronization signal controls the frame synchronization time standard (not shown) of the digital main signal, propagation delay time adjustment, etc. A high-quality digital signal output can be obtained.
この上うに構成すると、たとえディジタル主信号が復円
不能状態になっても受信部のフレームを送信部のフレー
ムと同期させることができる。フレーム同期けずれある
いけ同期引き込み問題の起りにくい高信頼度のディジタ
ル通信回線を構成でキル。送信部において送出されるフ
レーム同期トーン信号は、フレーム同期信号の整数分の
１の一定周波数の信号であるから、ディジタル主信号変
調波の占有周波数帯域に比べ本フレーム同期トーン信号
変調波の占有周波数帯域は非常に狭くすることができる
。したがってこの信号はディジタル主信号変調波に比べ
周波数選択性フェージングの影響を受けにくく、受信側
において復調されたフレーム同期信号は、復調ディジタ
ル主信号よシ抽出再生されたフレーム同期信号より信頼
度の高い本のとなる。With this configuration, even if the digital main signal becomes unable to return to circular form, the frame of the receiving section can be synchronized with the frame of the transmitting section. A highly reliable digital communication line that is unlikely to suffer from frame synchronization loss or synchronization pull-in problems. Since the frame synchronization tone signal sent out in the transmitter is a signal with a constant frequency that is an integer fraction of the frame synchronization signal, the occupied frequency of the frame synchronization tone signal modulation wave is lower than the occupied frequency band of the digital main signal modulation wave. Bands can be very narrow. Therefore, this signal is less susceptible to frequency selective fading than the digital main signal modulated wave, and the frame synchronization signal demodulated on the receiving side is more reliable than the frame synchronization signal extracted and reproduced from the demodulated digital main signal. Next to the book.
また、このフレーム同期信号をフレーム同期制御器以降
の装置、たとえばディジタル多重化装置で使用するよう
に系を構成すると、いっ十うの回線品質を向上させるこ
とができる。Furthermore, if the system is configured so that this frame synchronization signal is used in a device subsequent to the frame synchronization controller, such as a digital multiplexer, the line quality can be further improved.
以上説明したように、本発明の方式によれば、受信部に
精度の高い発振器を設けるものに比べてきわめて安定で
あり、周波数選択性フェージングに対して、高い信頼性
のあるフレーム同期信号伝送方式が得られる。As explained above, the method of the present invention is extremely stable compared to a method in which a highly accurate oscillator is provided in the receiving section, and is a highly reliable frame synchronization signal transmission method against frequency selective fading. is obtained.
図は本発明の実施例方式のブロック構成図。
１・・・ディジタル主信号入力端子、２・・・フレーム
同期信号入力端子、３・・・ディジタル変調器、４・・
・分周器、５・・・フレーム同期トーン信号、６・・・
トーン信号変調器、７・・・混合器、８・・・送信空中
線、９・・・受信空中線、１０・・・復調器、１１・・
・復調ディジタル主信号、１２・・・復調フレーム同期
トーン信号、１３・・・フレーム同期信号再生器、１４
・−・フレーム同期制御器、１５・・・復調ディジタル
主信号出力端子、１６・・・フレーム同期信号出力端子
。The figure is a block configuration diagram of an embodiment system of the present invention. 1... Digital main signal input terminal, 2... Frame synchronization signal input terminal, 3... Digital modulator, 4...
・Frequency divider, 5... Frame synchronization tone signal, 6...
Tone signal modulator, 7... Mixer, 8... Transmitting antenna, 9... Receiving antenna, 10... Demodulator, 11...
- Demodulated digital main signal, 12... Demodulated frame synchronization tone signal, 13... Frame synchronization signal regenerator, 14
- Frame synchronization controller, 15... Demodulated digital main signal output terminal, 16... Frame synchronization signal output terminal.
Claims (1)
１／／Ｎ（Ｎは２以上の整数）に分周してフレーム同期
トーン信号を得る手段と、 前記フレーム同期トーン信号により搬送波を変調して送
信信号を得る手段と を備え、 受信部には、 前記送信信号からフレーム同期トーン信号を復調する手
段と、 この復調されたフレーム同期トーン信号の周波数のＮ倍
に同期したフレーム同期信号を再生する手段と を備えたことを特徴とするフレーム同期信号伝送方式。(1) The transmitter includes means for dividing the frame synchronization signal frequency of the digital main signal to be transmitted by 1//N (N is an integer of 2 or more) to obtain a frame synchronization tone signal, and the frame synchronization tone signal. means for modulating a carrier wave to obtain a transmission signal, and the receiving section includes means for demodulating a frame synchronization tone signal from the transmission signal, and a means for demodulating a frame synchronization tone signal from the transmission signal, and a means for demodulating a frame synchronization tone signal from the transmission signal; 1. A frame synchronization signal transmission system comprising: means for reproducing a frame synchronization signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57117333A JPS598454A (en) | 1982-07-05 | 1982-07-05 | Transmission system of frame synchronizing signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57117333A JPS598454A (en) | 1982-07-05 | 1982-07-05 | Transmission system of frame synchronizing signal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS598454A true JPS598454A (en) | 1984-01-17 |
Family
ID=14709124
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57117333A Pending JPS598454A (en) | 1982-07-05 | 1982-07-05 | Transmission system of frame synchronizing signal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS598454A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8279859B2 (en) | 2007-05-28 | 2012-10-02 | Tellabs Oy | Method and arrangement for transferring synchronizing information |
-
1982
- 1982-07-05 JP JP57117333A patent/JPS598454A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8279859B2 (en) | 2007-05-28 | 2012-10-02 | Tellabs Oy | Method and arrangement for transferring synchronizing information |
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