JPS592447A - Data transmisson system having automatic equalizer - Google Patents
Data transmisson system having automatic equalizerInfo
- Publication number
- JPS592447A JPS592447A JP11126882A JP11126882A JPS592447A JP S592447 A JPS592447 A JP S592447A JP 11126882 A JP11126882 A JP 11126882A JP 11126882 A JP11126882 A JP 11126882A JP S592447 A JPS592447 A JP S592447A
- Authority
- JP
- Japan
- Prior art keywords
- value
- eyes
- automatic equalizer
- area
- type
- 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
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03012—Arrangements for removing intersymbol interference operating in the time domain
- H04L25/03019—Arrangements for removing intersymbol interference operating in the time domain adaptive, i.e. capable of adjustment during data reception
- H04L25/03038—Arrangements for removing intersymbol interference operating in the time domain adaptive, i.e. capable of adjustment during data reception with a non-recursive structure
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
Description
【発明の詳細な説明】
囚 発明の技術分野
本発明は、自動等化器を有するデータ伝送システム、特
に例えば１６個のアイをもつ如き多値伝送に当っても、
自動等化器のタップ係数を調整する不感領域をもうける
と共に、自動等化器の追従能力を大幅に劣化せしめない
ようにしたデータ伝送システムに関するものである。DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a data transmission system having an automatic equalizer, particularly for multilevel transmission such as one having 16 eyes.
The present invention relates to a data transmission system that provides a dead area for adjusting tap coefficients of an automatic equalizer and prevents the tracking ability of the automatic equalizer from significantly deteriorating.
（Ｂ） 技術の背景と問題点
従来から例えば４値のデータ伝送に当っては、複素平面
上でアイの値を（ａ＋Ｊ ｂ ）、（−ａ＋ｊｂ）、（
−ａ−ｊｂ）、（ａ−Ｊ ｂ ）に選ぶようにされる。(B) Technical Background and Problems Conventionally, for example, when transmitting four-value data, the eye values on the complex plane are expressed as (a+J b ), (-a+jb), (
-a-jb), (a-Jb).
そし５て受信データの値が上記いずれかのアイの値の予
め定めた近傍にあるとき、当該受信データの値を該当す
るアイの値とみなすと共に自動等化器のタップ係数の調
整を行い、受信データの値が上記いずれかのアイの値の
上記近傍から離れているとき、当該受信データ値を予め
指示したアイの値とみなすと共に自動等化器のタップ係
数の調整を無効化することが行われている。5. When the value of the received data is in the predetermined vicinity of any of the above eye values, the value of the received data is regarded as the corresponding eye value, and the tap coefficient of the automatic equalizer is adjusted; When the value of the received data is far from the above-mentioned vicinity of any of the above-mentioned eye values, it is possible to regard the received data value as a pre-instructed eye value and to disable the adjustment of the tap coefficient of the automatic equalizer. It is being done.
これは、上記近傍から離れている場合にも上記自動等化
器のタップ調整を行わせると、当該自動等化器がかえっ
て非所望に発散状態になってしまプ危険性があるからで
ある。This is because if the tap adjustment of the automatic equalizer is performed even when the automatic equalizer is far from the vicinity, there is a risk that the automatic equalizer will become undesirably divergent.
上記４値のデータ伝送における方策をそのまま例えば１
６値のデータ伝送に適用しようとすると、第１図図示の
如く不感領域が設定される。即ち、第１図において１は
夫々番、アイ、２はアイ１の近傍の領域であって本発明
にいう第１種の領域に対応するもの、３はアイ１の近傍
から離れている不感領域であって本発明にい５第２７１
の領域に対応するものを表わしているが、自動等化器の
タップ係数が削整されるようになる第１種の領域が第２
種の領域にくらべて少なくなる。このために、自動等化
器が回線の状態変化に追従する追従能力が低下する。For example, 1
When applied to six-value data transmission, a dead area is set as shown in FIG. That is, in FIG. 1, 1 is a number, an eye, 2 is a region near eye 1 and corresponds to the first type region according to the present invention, and 3 is a dead region away from the vicinity of eye 1. According to the present invention, No. 5, No. 271
The first type of area in which the tap coefficients of the automatic equalizer are reduced is the second type of area.
It is smaller than the area of seeds. This reduces the ability of the automatic equalizer to follow changes in line conditions.
このことを更に説明すると、受信データの値が例えば領
域２ａ内に入っている場合に、当該受信データの値がア
イ１ａの値にあるものとみなし、かつ当該受信データの
値（Ｐ＋ｊＱ）とアイ１ａの値（Ｐ’＋ｊＱ’）との差
にもとづいて上記タップ係数を調整する。このために自
動等化器は回線の状態に追従してゆく。しかし、上記不
感領域３内に入った場合・には、自動等化器が非所望に
発散してしまうことを防ぐために、上記タップ係数の調
整は無効化される。このために上記追従動作が禁止され
る。第１図図示の如く不感領域３０面積が大きくなると
、自動等化器の追従能力が下り、自動等化器の位相シッ
クの耐力が劣化する。To explain this further, if the value of the received data is within area 2a, for example, the value of the received data is considered to be at the value of eye 1a, and the value of the received data (P+jQ) and eye The tap coefficient is adjusted based on the difference from the value of 1a (P'+jQ'). For this reason, the automatic equalizer follows the line conditions. However, when entering the dead region 3, the adjustment of the tap coefficients is disabled in order to prevent the automatic equalizer from undesirably diverging. For this reason, the above-mentioned follow-up operation is prohibited. As shown in FIG. 1, when the area of the dead region 30 increases, the tracking ability of the automatic equalizer decreases, and the phase sick resistance of the automatic equalizer deteriorates.
（ｑ 発明の目的と構成
本発明は上記の点を解決することを目的としており、本
発明の自動等化器を有するデータ伝送システムは、実数
部Ｘと虚数部ｊｙとを軸とする複素平面上に与えられた
複数個のアイに対応した値を伝送するよう構成され、受
信側にもうけられる自動等化器に対するタップ係数が受
信データ値と当該データ値に対応するアイの値との誤差
分にもとづいて調整されるよう構成されてなる自動等化
器を有するデータ伝送システムにおいて、上記複素平面
の原点からの直線距離が遠い位置にあるＰ個の遠距離ア
イを除いた残余のアイの夫々の周辺に対応する第１種の
領域と、上記残余のアイの全体を包含しかつ上記第１ｆ
ｆ［の領域を除いた第２種の領域と、該第２種の領域の
外であってＰ個の上記各遠距離アイ相互間を分離する第
３種の領域とを考慮すると共に、上記自動等化器を介在
して抽出された受信データ値が上記第１種の領域内と５
第３種の領域内とにあるとき、当該データ値を対応する
アイの値とみなして出力すると共に上記誤差分を抽出し
て上記タップ係数を調整し、かつ上記受信データ値が上
記第２種の領域内にあるとき、当該データ値を予め指示
されたアイの値とみなして出力すると共に上記誤差分を
抽出して行うタップ係数の調整を無効化するよう制御す
ることを特徴としている。以下図面を参照しつつ説明す
る。(q Object and Structure of the Invention The present invention aims to solve the above points, and the data transmission system having the automatic equalizer of the present invention is a data transmission system having a complex plane with the real part X and the imaginary part jy as axes. The tap coefficient for the automatic equalizer, which is configured to transmit values corresponding to the plurality of eyes given above and is provided on the receiving side, is calculated by the difference between the received data value and the eye value corresponding to the data value. In a data transmission system having an automatic equalizer configured to be adjusted based on the above, each of the remaining eyes excluding the P long-distance eyes located at a long straight-line distance from the origin of the complex plane. and the 1st type area corresponding to the periphery of the eye, and the 1f
Considering the second type of area excluding the area of f[, and the third type of area that is outside the second type of area and separating the P long distance eyes, If the received data value extracted through the automatic equalizer is within the above type 1 region and 5
When the received data value is within the type 3 region, the data value is regarded as the corresponding eye value and output, the error is extracted and the tap coefficient is adjusted, and the received data value is within the type 2 region. When the data value is within the region, the data value is regarded as a pre-instructed eye value and outputted, and the tap coefficient adjustment performed by extracting the error is controlled to be invalidated. This will be explained below with reference to the drawings.
η 発明の実施例
第２図は本発明による一実施例の態様を説明する説明図
、第３図は本発明の一実施例構成を示す。η Embodiment of the Invention FIG. 2 is an explanatory diagram illustrating aspects of an embodiment of the invention, and FIG. 3 shows the configuration of an embodiment of the invention.
第２図において、符号１．２．３は第１図に対応し、４
−１．４−２．４−３．４−４は夫、々本発明にいう第
３種の領域、１−１．１−２．１−３．１−４は夫々本
発明にいう遠距離アイに対応するものを表わしている。In Figure 2, numerals 1.2.3 correspond to those in Figure 1, and 4
-1.4-2.4-3.4-4 are respectively the third type area according to the present invention, and 1-1.1-2.1-3.1-4 are respectively the distant area according to the present invention. It represents what corresponds to the distance eye.
第２図に示す本発明の一実施例の態様の場合、第１図と
対比すると明瞭になる如く、遠距離アイ１−１を除く全
残余のアイを包むように第２拙の領域３の範囲を限定し
、第２ｓの領域３の外周に各遠距離アイ１−１間を区分
する第３種の領域４−１をもうけるようにしている。そ
して、第２種の領域３内に受信データの値が入った場合
に、上述のタップ係数の調整を禁止するよ５にする。こ
のようにすることによって、例えばノイズが混入して受
信データの値が本来のアイの値から太き（離れてしまう
ような場合においても、第３種の領域４−１の面積が大
きいために、非所望な発散を生じない範囲で自動等化器
の追従性が第１図図示の場合にくらべて大きく向上する
。In the case of the embodiment of the present invention shown in FIG. 2, as will become clear when compared with FIG. , and a third type of area 4-1 is provided on the outer periphery of the second s-th area 3 to partition between each of the long-distance eyes 1-1. Then, when the value of the received data falls within the second type region 3, the value is set to 5 to prohibit the adjustment of the tap coefficients described above. By doing this, for example, even if the value of the received data becomes thicker (deviates from the original eye value due to noise), the area of the third type region 4-1 is large. , the followability of the automatic equalizer is greatly improved compared to the case shown in FIG. 1 within a range where undesired divergence does not occur.
第３図は本発明の一実施例構成を示す。図中の符号５は
自動等化器、６は４キャリヤ自動位相調整器、７は判定
回路、８ないし１０は夫々乗算器、１１は減算器、１２
は判定回路用メモリを表わしている。FIG. 3 shows the configuration of an embodiment of the present invention. In the figure, 5 is an automatic equalizer, 6 is a 4-carrier automatic phase adjuster, 7 is a judgment circuit, 8 to 10 are multipliers, 11 is a subtracter, 12
represents a memory for the determination circuit.
判定回路用メモリ１２は、第２図図水平面上のいわばす
べての座標点に対応する番地をそなえている。そして、
各番地には、受信データ（ｘ＋ｊｙ）が当該番地に対応
する値をもった場合に、（１１当該受信データ（ｘ＋ｊ
ｙ ）を成るアイの値とみなすようにする「判定」値
、（１１）当該判定値に対応した値（ａ ＋ ｊ ｂ
）を表わすＲＥ Ｆ 、 （Ｉｌｌ）当該受信データの
値が不感領域内にあるか否かを表わすα（不感領域内の
場合α＝Ｏ１その他α＝１）が対とされて格納されてい
るる
従来公知の如く、自動等化器５からの出力が、キャリヤ
自動位相調整器６の出力と一諸にされて、受信データ（
ｘ＋Ｊ ｙ ）が抽出され、判定回路７に供給される。The determination circuit memory 12 has addresses corresponding to, so to speak, all coordinate points on the horizontal plane in FIG. and,
At each address, if the received data (x+jy) has a value corresponding to the address, (11 the received data (x+j)
y) is regarded as the value of the eye consisting of (11) the value corresponding to the judgment value (a + j b
), and (Ill) α representing whether the value of the received data is within the dead area (if inside the dead area, α=O1, otherwise α=1) are stored as a pair. As is conventionally known, the output from the automatic equalizer 5 is combined with the output from the carrier automatic phase adjuster 6, and the received data (
x+J y ) is extracted and supplied to the determination circuit 7.
判定回路７内には図示の如く判定回路用メモリ１２が用
意されており、当該メモリ１２の（ｘ＋ｊ ｙ ）で指
示される番地の内容がリードされる。As shown in the figure, a determination circuit memory 12 is provided in the determination circuit 7, and the contents of the address designated by (x+j y ) of the memory 12 are read.
当該リードされた内容における判定値がａ十Ｊｂであっ
たとすると、判定回路７は一ト記受信データの値が本来
（ａ＋ｊ ｂ ）であったものとして値（ａ＋Ｊｂ）に
対応するコードを判定結果を出力する。一方上記ＲＥＦ
としてアナログ値（ａ＋ｊｂ）が減算器１１に供給され
、誤差分（エラー）として
（ａ＋Ｊ ｂ ）−（ｘ＋Ｊ ｙ ）が抽出さ
れる。この誤差分は、キャリヤ自動位相調整器６に通知
されると共に、乗算器９．１０を介して、自動等化器５
のタップ係数を調整するために利用される。しかし、上
記リードされた内容においてα＝０であった場合、乗算
器１０の出力は値「・０」となり、タップ係数の調整は
無効化される。Assuming that the judgment value in the read content is a + Jb, the judgment circuit 7 assumes that the value of the received data was originally (a + j b ) and uses the code corresponding to the value (a + Jb) as the judgment result. Output. On the other hand, the above REF
The analog value (a+jb) is supplied to the subtracter 11, and (a+J b )-(x+J y ) is extracted as an error. This error is notified to the carrier automatic phase adjuster 6, and is also sent to the automatic equalizer 5 via the multiplier 9.10.
It is used to adjust the tap coefficient of. However, if α=0 in the above-mentioned read content, the output of the multiplier 10 will be the value ".0", and the adjustment of the tap coefficient will be invalidated.
（均 発明の詳細
な説明した如く、本発明によれば、第１図図示の場合に
くらべて第２図図示の如く、不感領域の占める面積が小
さくなり、自動等化器の追従能力を劣化させることなく
、自動等化器が非所望に発散状態となることを防止せし
めることが可能となる。(As explained in detail, according to the present invention, the area occupied by the dead region is smaller as shown in FIG. 2 than in the case shown in FIG. 1, which deteriorates the tracking ability of the automatic equalizer. Therefore, it is possible to prevent the automatic equalizer from becoming undesirably divergent without causing the automatic equalizer to become undesirably divergent.
【図面の簡単な説明】
第１図は本発廚の前提となる問題を説明する説明図、第
２図は本発明による一実施例の態様を説明する説明図、
第３図は本発明の一実施例構成を示す。
図中、ｌはアイ、１−１ないし１−４は遠距離アイ、２
は第１種の領域、３は第２種の領域、４−１ないし４−
４は第３種の領域、５は自動等化器、６はキャリヤ自動
位相調整器、７は判定回路を表わす。
特許出願人 富士通株式会社
代理人弁理士 森 １） 寛
（外１名）[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is an explanatory diagram illustrating the problem that is the premise of this invention, FIG. 2 is an explanatory diagram illustrating an aspect of an embodiment according to the present invention,
FIG. 3 shows the configuration of an embodiment of the present invention. In the figure, l is an eye, 1-1 to 1-4 are long-distance eyes, and 2
is the first type area, 3 is the second type area, 4-1 to 4-
4 represents a third type region, 5 an automatic equalizer, 6 an automatic carrier phase adjuster, and 7 a determination circuit. Patent applicant Hiroshi Mori (1 other person), agent patent attorney of Fujitsu Ltd.
Claims (1)
れた複数個のアイに・対応した値を伝送するよう構成さ
れ、受信側にもうけられる自動等化器に対するタップ係
数が受信データ値と当該データ値に対応するアイの値と
の誤差分にもとづいて調整されるよう構成されてなる自
動等化器を有するデータ伝送システムにおいて、上記複
素平面の原点からの直線距離・が遠い位置にあるＰ個の
遠距離アイを除いた残余のアイの夫々の周辺に対応する
第１種の領域と、上記残余のアイの全体を包含しかつ上
記第１種の領域を除いた第２種の領域と、咳第２種の領
域の外であってＰ個の上記各遠距離アイ相互間を分離す
る第３種の領域とを考慮すると共に、上記自動等化器を
介在して抽出された受信データ値が上記第１種の領域内
と第３種の領域内とにあるとき、当該データ値を対応す
るアイの値とみなして出力すると共に上記誤差分を抽出
して上記タップ係数を調整し、かつ上記受信データ値が
上記第２種の領域内にあるとき、当該データ値を予め指
示されたアイの値とみなして出力すると共に上記誤差分
を抽出して行うタップ係数の調整を無効化するよう制御
することを特徴とする自動等化器を有するデータ伝送シ
ステム。It is configured to transmit values corresponding to a plurality of eyes given on a complex plane with the real part In a data transmission system having an automatic equalizer configured to perform adjustment based on the error between a value and an eye value corresponding to the data value, a position where the straight line distance from the origin of the complex plane is far. a first type region corresponding to the periphery of each of the remaining eyes excluding the P long-distance eyes in , and a second type region including the entire remaining eyes and excluding the first type region and a third type area that is outside the second type cough area and separates the P long distance eyes from each other, and is extracted through the automatic equalizer. When the received data value is within the type 1 region and the type 3 region, the data value is regarded as the corresponding eye value and output, and the error is extracted and the tap coefficient is calculated. and when the received data value is within the second type region, the data value is regarded as a pre-instructed eye value and output, and the tap coefficient is adjusted by extracting the error amount. A data transmission system having an automatic equalizer, characterized in that the automatic equalizer is controlled to be disabled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11126882A JPS592447A (en) | 1982-06-28 | 1982-06-28 | Data transmisson system having automatic equalizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11126882A JPS592447A (en) | 1982-06-28 | 1982-06-28 | Data transmisson system having automatic equalizer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS592447A true JPS592447A (en) | 1984-01-09 |
| JPH0145776B2 JPH0145776B2 (en) | 1989-10-04 |
Family
ID=14556895
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11126882A Granted JPS592447A (en) | 1982-06-28 | 1982-06-28 | Data transmisson system having automatic equalizer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS592447A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6179325A (en) * | 1984-09-27 | 1986-04-22 | Toshiba Corp | Automatic equalizer |
| JPS62232223A (en) * | 1986-03-25 | 1987-10-12 | シーメンス・テレコムニカツイオーニ・ソチエタ・ペル・アチオニ | Method and apparatus for equalizing adaptable blind |
| JPS6398165A (en) * | 1986-10-14 | 1988-04-28 | Fanuc Ltd | Laser |
| EP0554120A2 (en) * | 1992-01-31 | 1993-08-04 | Fujitsu Limited | Adaptive transversal equalizer |
-
1982
- 1982-06-28 JP JP11126882A patent/JPS592447A/en active Granted
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6179325A (en) * | 1984-09-27 | 1986-04-22 | Toshiba Corp | Automatic equalizer |
| JPS62232223A (en) * | 1986-03-25 | 1987-10-12 | シーメンス・テレコムニカツイオーニ・ソチエタ・ペル・アチオニ | Method and apparatus for equalizing adaptable blind |
| JPS6398165A (en) * | 1986-10-14 | 1988-04-28 | Fanuc Ltd | Laser |
| EP0554120A2 (en) * | 1992-01-31 | 1993-08-04 | Fujitsu Limited | Adaptive transversal equalizer |
| EP0554120A3 (en) * | 1992-01-31 | 1994-01-19 | Fujitsu Ltd | |
| US5598433A (en) * | 1992-01-31 | 1997-01-28 | Fujitsu Limited | Automatic equalizer and data mode convergence method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0145776B2 (en) | 1989-10-04 |
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