JPS648937B2 - - Google Patents

Info

Publication number
JPS648937B2
JPS648937B2 JP19716081A JP19716081A JPS648937B2 JP S648937 B2 JPS648937 B2 JP S648937B2 JP 19716081 A JP19716081 A JP 19716081A JP 19716081 A JP19716081 A JP 19716081A JP S648937 B2 JPS648937 B2 JP S648937B2
Authority
JP
Japan
Prior art keywords
signal
training
data
output
training signal
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
Application number
JP19716081A
Other languages
Japanese (ja)
Other versions
JPS5897928A (en
Inventor
Takashi Kako
Hiroya Tanaka
Shigeyuki Umigami
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP19716081A priority Critical patent/JPS5897928A/en
Publication of JPS5897928A publication Critical patent/JPS5897928A/en
Publication of JPS648937B2 publication Critical patent/JPS648937B2/ja
Granted legal-status Critical Current

Links

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
    • H04L7/041—Speed or phase control by synchronisation signals using special codes as synchronising signal
    • H04L7/046—Speed or phase control by synchronisation signals using special codes as synchronising signal using a dotting sequence
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/02—Speed or phase control by the received code signals, the signals containing no special synchronisation information

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Description

【発明の詳細な説明】 (1) 技術の分野 本発明は送受回線の瞬断耐力を向上するため、
受信信号がトレーニング信号かデータかを識別す
るトレーニング検出方式に関するものである。[Detailed Description of the Invention] (1) Technical Field The present invention provides the following features to improve the resistance to momentary interruptions of transmission and reception lines.
The present invention relates to a training detection method for identifying whether a received signal is a training signal or data.

(2) 従来技術 従来、位相変調データを用いるデータ伝送シス
テムで、π連送パターンを先頭に含むトレーニン
グ信号を送信して受信側で自動等化器により等化
し、受信引込みを行なう方式が多用されている。
この従来のデータ伝送システムでは回線に瞬断が
あつた場合、次に受信された信号はすべてトレー
ニング信号とみなされている。このため、受信側
のモデル内の自動等化器は発散状態となり、発信
可能な状態となるまでかなりの時間を要してい
た。(2) Prior art Conventionally, in data transmission systems using phase modulation data, a method has often been used in which a training signal containing a π continuous transmission pattern at the beginning is transmitted, and the signal is equalized by an automatic equalizer on the receiving side to perform reception pull-in. ing.
In this conventional data transmission system, when there is a momentary interruption in the line, all signals received next are regarded as training signals. For this reason, the automatic equalizer in the model on the receiving side enters a divergent state, and it takes a considerable amount of time to reach a state where transmission is possible.

トレーニング信号に関するCCITTのV27の勧
告によれば、第１図に示すように、トレーニング
信号は３つのセグメント（SEG）より成り、
SEG１はπ連送であり位相平面上ので示すよ
うに０、πが交互に送出され（π連送）受信部の
モデムにおけるキヤリア検出、AGCの引込み、
タイミングPLLの引込み、キヤリヤAPCの引込
みに用いられる。SEG２はで示すように０、
πランダムに送出され、自動等化器の引込み、キ
ヤリアAPCの引込みに用いられる。SEG３は
で示すように８値のスクランブルを送出し、デス
クランブラを引込ませる。SEG４はで示され
データの受信状態となる。 According to the CCITT V27 recommendation regarding training signals, the training signal consists of three segments (SEG), as shown in Figure 1.
SEG1 is π continuous transmission, and as shown on the phase plane, 0 and π are sent out alternately (π continuous transmission), carrier detection in the receiving section modem, AGC pull-in,
Used for timing PLL retraction and carrier APC retraction. SEG2 is 0 as shown in
It is sent out randomly and is used for automatic equalizer pull-in and carrier APC pull-in. SEG3 sends out an 8-value scramble as shown in and causes the descrambler to engage. SEG4 is in the data receiving state as indicated by .

回線の瞬断の場合でも上記の動作が行なわれる
から、次に来る信号がデータであると自動等化器
は発散状態となる。 Since the above operation is performed even in the case of a momentary interruption of the line, the automatic equalizer enters a divergent state if the next signal is data.

(3) 発明の目的 本発明は受信信号がトレーニング信号かデータ
かを識別し最適の処理シーケンスが行なえるよう
にし、送受回線の瞬断耐力を向上するようにした
トレーニング検出方式を提供することである。(3) Purpose of the Invention The present invention provides a training detection method that can identify whether a received signal is a training signal or data, perform an optimal processing sequence, and improve the resistance to momentary interruptions of a transmission/reception line. be.

(4) 発明の構成 前記目的を達成するため、本発明のトレーニン
グ検出方式は送信装置と受信装置とを具え、トレ
ーニング信号を受信してデータ信号に対する受信
引込みを行なつてデータを受信するデータ伝送シ
ステムにおいて、 トレーニング信号を識別する手段と、 受信装置の瞬断後に受信した信号の種類に応じ
て各々異なる処理シーケンスを起動する手段とを
設け、 受信装置の瞬断後、受信装置はトレーニング信
号であると該識別手段で識別された信号によつて
受信引込みを行なうことを特徴とするものであ
る。(4) Structure of the Invention In order to achieve the above object, the training detection method of the present invention includes a transmitting device and a receiving device, and performs data transmission by receiving a training signal, performing reception pull-in for a data signal, and receiving data. The system includes means for identifying the training signal and means for activating different processing sequences depending on the type of signal received after a momentary interruption of the receiving device, so that after the momentary interruption of the receiving device, the receiving device uses the training signal. If there is a signal, the reception pull-in is performed based on the signal identified by the identification means.

(5) 発明の実施例 第２図は本発明の機能を説明する流れ図であ
る。前述のようなトレーニング信号を用いたデー
タ伝送システムの回線に瞬断が発生した場合、次
に来るべき信号がトレーニング信号かデータ信号
かを識別する必要がある。さらにこの外にトーン
の場合も考えられる。本発明ではトレーニング信
号の先頭セグメントのπ連送パターンにより瞬断
時の次に来る信号をトレーニング、データ、トー
ンの順に識別してゆき、トレーニング信号に該当
するならばトレーニングシーケンスにより前述の
受信側モデムの引込みシーケンスを実行し、デー
タ信号に該当するならば瞬断時間の経過により自
動等化器の誤差が無限大に発散しないように所定
のタイミング位相、タツプ係数等を与える瞬断シ
ーケンスを実行する。トーン信号に該当する場合
も同様のトーンシーケンスを実行する。このよう
にして瞬断耐力を増大させることができる。(5) Embodiments of the Invention FIG. 2 is a flowchart explaining the functions of the present invention. When a momentary interruption occurs in the line of a data transmission system using training signals as described above, it is necessary to identify whether the next signal to come is a training signal or a data signal. Furthermore, in addition to this, the case of tone can also be considered. In the present invention, the next signal at the time of an instantaneous interruption is identified in the order of training, data, and tone by the π continuous transmission pattern of the first segment of the training signal, and if the signal corresponds to the training signal, the training sequence is used to If it corresponds to the data signal, execute the instantaneous interruption sequence to give a predetermined timing phase, tap coefficient, etc. so that the error of the automatic equalizer does not diverge to infinity as the instantaneous interruption time passes. . A similar tone sequence is executed when the tone signal is applicable. In this way, instantaneous interruption resistance can be increased.

第３図ａ，ｂは本発明の実施例の構成説明図で
あり、同図ａは受信装置の全体構成図、同図ｂは
要部のトレーニング検出回路の詳細説明図であ
る。同図ａよりトレーニング信号とデータより成
る受信信号を自動利得調整器（AGC）１に入力
して利得調整し、Ａ／Ｄ変換器２によりデジタル
信号に変換し、復調器（DEM）３で復調する。
この復調出力をロールオフフイルタ（ROF）４
に入れて波形の０点検出を行なう。ROF４は余
弦特性を有する低域通過フイルタである。この出
力を自動等化器（AEQ）５と本発明の要部であ
るトレーニング検出回路１０に入れる。トレーニ
ング検出回路はπ連送パターンを識別する手段を
有し瞬断時の次に来る信号がトレーニングかデー
タかまたはトーンかを識別し、対応するシーケン
スを適用する。 FIGS. 3a and 3b are configuration explanatory diagrams of an embodiment of the present invention. FIG. 3a is an overall configuration diagram of a receiving device, and FIG. 3b is a detailed explanatory diagram of a main part of a training detection circuit. From a in the figure, a received signal consisting of a training signal and data is input to an automatic gain controller (AGC) 1 to adjust the gain, converted to a digital signal by an A/D converter 2, and demodulated by a demodulator (DEM) 3. do.
This demodulated output is passed through the roll-off filter (ROF) 4.
to detect the zero point of the waveform. ROF4 is a low pass filter with cosine characteristics. This output is input to an automatic equalizer (AEQ) 5 and a training detection circuit 10, which is the main part of the present invention. The training detection circuit has means for identifying the π continuous transmission pattern, and identifies whether the next signal at the time of the momentary interruption is training, data, or tone, and applies the corresponding sequence.

同図ｂはトレーニング検出回路１０の詳細説明
図である。ROF４の出力の実数部と虚数部とを、
それぞれの分路に遅延回路Ｔを有し１信号ずらし
て加算する和分回路１１，１２を通し、各出力を
２乗して加算する絶対値回路１３に入力する。一
方、ROF４の出力の実数部と虚数部とをそれぞ
れ分岐し、各出力を２乗して加算する絶対値回路
１４と低域通過フイルタ（LPF）１５を通しそ
の出力を差分回路１６に入れ、前記絶対値回路
１３の出力との差分を求める。この場合、
LPF１５は連続する信号に定数α1，α2を乗じて
加算することにより、絶対値回路１４の出力に基
づいた積分設定値を差分回路１６に供給する。次
に差分回路１６の出力をタツプ遅延線１７に送
り、各信号毎の遅延タイミングＴの出力を符号判
定回路１８に入れる。ここで第４図ａ，ｂ，ｃで
説明する方法によりトレーニングか、トーンか、
データかを判定し、識別信号として出力する。 FIG. 1B is a detailed explanatory diagram of the training detection circuit 10. The real part and imaginary part of the output of ROF4 are
The signals are passed through summing circuits 11 and 12, each having a delay circuit T in each branch, which shifts and adds one signal, and inputs into an absolute value circuit 13 which squares and adds each output. On the other hand, the real part and the imaginary part of the output of the ROF 4 are branched, and the outputs are passed through an absolute value circuit 14 and a low-pass filter (LPF) 15 that square and add each output, and input the output into a difference circuit 16. The difference from the output of the absolute value circuit 13 is determined. in this case,
The LPF 15 multiplies the continuous signals by constants α 1 and α 2 and adds them, thereby supplying an integral set value based on the output of the absolute value circuit 14 to the difference circuit 16 . Next, the output of the difference circuit 16 is sent to the tap delay line 17, and the output of the delay timing T for each signal is sent to the sign determination circuit 18. Here, by the method explained in Figure 4 a, b, c, training or tone,
It determines whether it is data and outputs it as an identification signal.

第４図ａ，ｂ，ｃはそれぞれトレーニング、ト
ーン、データの場合における出力、、の波
形を示したものである。 Figures 4a, b, and c show the waveforms of the output in the case of training, tone, and data, respectively.

同図ａはトレーニングの場合であり、絶対値回
路１３の出力は和分回路１１，１２とも０で、
その絶対値の和であるから０となる。 Figure a shows the case of training, where the output of the absolute value circuit 13 is 0 for both the summation circuits 11 and 12,
Since it is the sum of their absolute values, it becomes 0.

また出力は一定の正値となり、出力は出力
と出力との差分であるから図のような一定の
負値を各タイミングに示す。 Further, the output is a constant positive value, and since the output is the difference between the outputs, a constant negative value is shown at each timing as shown in the figure.

同図ｂはトーンの場合であり、出力は和分回
路１１が正値、和分回路１２が０であるから、そ
の絶対値の和として正値を示す。また出力は出
力の半分の正値を示し、従つて出力は図のよ
うな一定の正値を各タイミングに示す。 Figure b shows the case of tone, and since the output from the summing circuit 11 is positive and the output from the summing circuit 12 is 0, a positive value is shown as the sum of their absolute values. Also, the output shows a positive value that is half of the output, and therefore the output shows a constant positive value at each timing as shown in the figure.

同図ｃはデータの場合であり、出力は各点が
正値をもつ波形で示されるが、和分回路１１と１
２の関係で出力より大きい場合もあれば小さい
場合もある。従つて出力は出力と出力の差
分となるから正値と負値が各タイミングにラ
ンダムに現われる。以上のように各タイミングに
おける信号の符号配列を判定すればトレーニン
グ、トーン、データを識別することができる。 Figure c shows the case of data, and the output is shown as a waveform in which each point has a positive value.
2, it may be larger than the output or smaller than the output. Therefore, since the output is the difference between the outputs, positive values and negative values appear randomly at each timing. As described above, by determining the code arrangement of the signal at each timing, training, tone, and data can be identified.

第５図は本発明の他の実施例の構成説明図であ
る。 FIG. 5 is an explanatory diagram of the configuration of another embodiment of the present invention.

同図において、入力データを遅延回路Ｔで１信
号遅延させた上複数共役（＊）をとり、次の信号
と乗算する回路２１の出力をタツプ遅延線１７に
送り、各信号毎の遅延タイミングＴの出力を符号
判定回路１８に入れて識別信号を取出す。 In the same figure, the input data is delayed by one signal in a delay circuit T, and the output of the circuit 21 which takes the multiple conjugate (*) and multiplies it by the next signal is sent to the tap delay line 17, and the delay timing T for each signal is The output is input to the code determination circuit 18 and an identification signal is extracted.

いま、入力データ系列をA1ej〓1、A2ej〓2、
A3ej〓3、…とすると、回路２１の出力は Aoe-j〓nAo+1ej〓n+1＝Ao・Ao+1ej(〓n+1-〓n) (1) となる。ここで、 (i) π連送のトレーニングの場合、θo+1−θo＝±
πとなるから ＝Ao・Ao+1e±j〓 (2) (ii) トーンの場合、θo+1−θo＝０となるから ＝Ao・Ao+1e0 (3) (iii) データの場合、θo+1−θoはランダムとなるか
ら ＝Ao・Ao+1ej(〓n+1-〓n) (4) 式(2)、(3)、(4)を図で示すと第６図ａ，ｂ，ｃと
なり、符号判定回路１８に入力される符号配列は
第３図の実施例と同様にトレーニングでは負値
の連続、トーンでは正値の連続、データでは正
値、負値ランダムに現われることにより、明
らかに識別することができる。 Now, the input data series is A 1 e j 〓 1 , A 2 e j 〓 2 ,
If A 3 e j 〓 3 ,..., then the output of the circuit 21 is A o e -j 〓 n A o+1 e j 〓 n+1 = A o・A o+1 e j( 〓 n+1- 〓 n) (1). Here, (i) In the case of π continuous transmission training, θ o+1 −θ o = ±
Since π = A o・A o+1 e ±j 〓 (2) (ii) In the case of tone, θ o+1 −θ o = 0, so = A o・A o+1 e 0 (3 ) (iii) In the case of data, θ o+1 −θ o is random, so =A o・A o+1 e j( 〓 n+1- 〓 n) (4) Equations (2), (3) , (4) are illustrated in figures 6a, b, and c, and the code array input to the sign determination circuit 18 is a series of negative values in training, and positive values in tone, as in the embodiment of FIG. 3. It can be clearly identified by the series of positive and negative values appearing randomly in the data.

(6) 発明の効果 以上説明したように、本発明によれば、π連送
を識別する手段により、瞬断の次に来る信号がト
レーニングかトーンかデータかを明確に判別する
ことができ、その結果それぞれの対応シーケンス
を適用することが可能となり瞬断耐力の増大に役
立つものである。(6) Effects of the Invention As explained above, according to the present invention, by means of identifying continuous π transmission, it is possible to clearly determine whether the signal that follows an instantaneous interruption is training, tone, or data. As a result, each corresponding sequence can be applied, which is useful for increasing momentary interruption resistance.

【図面の簡単な説明】[Brief explanation of drawings]

第１図はトレーニング信号の一般説明図、第２
図は本発明の機能説明図、第３図ａ，ｂは本発明
の実施例の構成説明図、第４図ａ〜ｃは本発明の
動作説明図、第５図は本発明の他の実施例の構成
説明図、第６図ａ〜ｃは第５図の動作説明図であ
り、図中１は自動利得調整器、２はＡ／Ｄ変換
器、３は復調器、４はロールオフフイルタ、５は
自動等化器、１０はトレーニング検出回路、１
１，１２は和分回路、１３，１４は絶対値回路、
１５は低域通過フイルタ、１６は差分器、１７は
タツプ遅延線、１８は符号判定回路、２１は乗算
回路を示す。 Figure 1 is a general explanatory diagram of the training signal, Figure 2
3 is a functional explanatory diagram of the present invention, FIGS. 3 a and b are configuration explanatory diagrams of embodiments of the present invention, FIGS. 4 a to c are explanatory diagrams of the operation of the present invention, and FIG. 5 is another embodiment of the present invention. 6a to 6c are explanatory diagrams of the operation of FIG. 5, in which 1 is an automatic gain adjuster, 2 is an A/D converter, 3 is a demodulator, and 4 is a roll-off filter. , 5 is an automatic equalizer, 10 is a training detection circuit, 1
1 and 12 are summation circuits, 13 and 14 are absolute value circuits,
15 is a low-pass filter, 16 is a differencer, 17 is a tap delay line, 18 is a sign determination circuit, and 21 is a multiplication circuit.

Claims (1)

【特許請求の範囲】 １ 送信装置と受信装置とを具え、トレーニング
信号を受信してデータ信号に対する受信引込みを
行なつてデータを受信するデータ伝送システムに
おいて、 トレーニング信号を識別する手段と、 受信装置の瞬断後に受信した信号の種類に応じ
て各々異なる処理シーケンスを起動する手段とを
設け、 受信装置の瞬断後、受信装置はトレーニング信
号であると該識別手段で識別された信号によつて
受信引込みを行なうことを特徴とするトレーニン
グ信号検出方式。 ２ 前記トレーニング信号は、π連送パターンの
セグメントを含むものであり、該トレーニング信
号識別手段は互いに連結する受信データ信号の位
相差を抽出して少なくとも前記π連送パターンか
否か識別するものであることを特徴とする特許請
求の範囲第１項記載のトレーニング検出方式。[Scope of Claims] 1. A data transmission system that includes a transmitter and a receiver, receives a training signal, performs reception pull-in for the data signal, and receives data, comprising: means for identifying the training signal; and the receiver. and means for activating different processing sequences depending on the type of signal received after the instantaneous interruption of the receiving device, and after the instantaneous interruption of the receiving device, the receiving device activates the signal that is identified as a training signal by the identifying means. A training signal detection method characterized by performing reception pull-in. 2. The training signal includes segments of a π continuous transmission pattern, and the training signal identifying means extracts a phase difference between mutually connected received data signals to identify whether or not the π continuous transmission pattern is present. A training detection method according to claim 1, characterized in that:
JP19716081A 1981-12-08 1981-12-08 Training detection system Granted JPS5897928A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP19716081A JPS5897928A (en) 1981-12-08 1981-12-08 Training detection system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP19716081A JPS5897928A (en) 1981-12-08 1981-12-08 Training detection system

Publications (2)

Publication Number Publication Date
JPS5897928A JPS5897928A (en) 1983-06-10
JPS648937B2 true JPS648937B2 (en) 1989-02-15

Family

ID=16369763

Family Applications (1)

Application Number Title Priority Date Filing Date
JP19716081A Granted JPS5897928A (en) 1981-12-08 1981-12-08 Training detection system

Country Status (1)

Country Link
JP (1) JPS5897928A (en)

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JP2579986B2 (en) * 1988-02-09 1997-02-12 富士通株式会社 Binary and octal detector
JPH01269346A (en) * 1988-04-21 1989-10-26 Maspro Denkoh Corp Psk transmission and reception system
JPH08194906A (en) * 1995-01-20 1996-07-30 Fujitsu Ltd Disc apparatus
JP2000068901A (en) * 1998-08-21 2000-03-03 Fujitsu Ltd Data transmitter, automatic level adjustment method and pull-in control method

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