JPH05316082A - Data communication equipment - Google Patents

Data communication equipment

Info

Publication number
JPH05316082A
JPH05316082A JP12060892A JP12060892A JPH05316082A JP H05316082 A JPH05316082 A JP H05316082A JP 12060892 A JP12060892 A JP 12060892A JP 12060892 A JP12060892 A JP 12060892A JP H05316082 A JPH05316082 A JP H05316082A
Authority
JP
Japan
Prior art keywords
data
level
error correction
environment
noise level
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
Application number
JP12060892A
Other languages
Japanese (ja)
Inventor
Hiroshi Yano
博司 矢野
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.)
Omron Corp
Original Assignee
Omron Corp
Omron Tateisi Electronics Co
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 Omron Corp, Omron Tateisi Electronics Co filed Critical Omron Corp
Priority to JP12060892A priority Critical patent/JPH05316082A/en
Publication of JPH05316082A publication Critical patent/JPH05316082A/en
Pending legal-status Critical Current

Links

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  • Detection And Prevention Of Errors In Transmission (AREA)

Abstract

PURPOSE:To select a proper error check code in matching with a noise level in an environment by detecting a noise level in an environment or a line and a signal level from a specific transmission station. CONSTITUTION:A data terminal equipment 10 in a radio terminal station is provided with a data processing function and a data input output function and data are sent/received in a text form. A controller 11 controls a transmission/reception frequency to identify a destination of a received text and an A/D converter 13 sends a reception signal of a transmitter-receiver 12 to the terminal equipment 10. The terminal equipment 10 separates a noise and an object signal from an input signal and compares the level and indexes the communication environment and decides an optimum error check code. In this case, a link table in the equipment 10 stores the error check code and an optimum error check code at reception is selected based on a noise level and an error occurrence rate of the like at the reception of the text.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】この発明は、データの送受信を行
うデータ通信装置に関し、特に、その誤り訂正方式の改
善に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data communication device for transmitting and receiving data, and more particularly to improvement of its error correction system.

【0002】[0002]

【産業上の利用分野】データ伝送においては、受信局が
受信したデータに誤りがないかを確認するため誤り訂正
符号が付加されている。受信局ではこの誤り訂正符号に
よって受信データの誤りの有無を判断し、誤りがある場
合には、自己訂正または再送を依頼する。
BACKGROUND OF THE INVENTION In data transmission, an error correction code is added in order to confirm whether or not there is an error in the data received by a receiving station. The receiving station judges whether or not there is an error in the received data based on this error correction code, and if there is an error, requests self-correction or retransmission.

【0003】従来のデータ伝送システムにおいては、送
受信装置の能力および想定される回線(無線の場合には
環境)のノイズレベル等に基づいて適当な誤り訂正符号
を予め決定しシステムに適用していた。
In the conventional data transmission system, an appropriate error correction code is determined in advance based on the capability of the transmitter / receiver and the noise level of the assumed line (in the case of wireless environment) and applied to the system. .

【0004】[0004]

【発明が解決しようとする課題】しかしながら、このよ
うな従来のシステムにおいては、想定されたノイズレベ
ルが実際のノイズレベルよりも大きい場合にはオーバー
スペックとなり誤り訂正符号が冗長度が大きすぎて実質
的なデータ伝送の速度が遅くなる欠点があった。
However, in such a conventional system, when the assumed noise level is higher than the actual noise level, it becomes over-spec, and the error correction code has a too large degree of redundancy. However, there is a drawback that the data transmission speed becomes slow.

【0005】また、逆に想定されたノイズレベルが実際
のレベルよりも低い場合にはエラーを訂正することがで
きず、伝送ができなくなるおそれがあった。
On the contrary, if the assumed noise level is lower than the actual level, the error cannot be corrected, and there is a possibility that transmission cannot be performed.

【0006】この発明は、環境等のノイズレベルに合わ
せて適当な誤り訂正符号を選択できるデータ通信装置を
提供することを目的とする。
An object of the present invention is to provide a data communication device capable of selecting an appropriate error correction code according to the noise level of the environment or the like.

【0007】[0007]

【課題を解決するための手段】この発明は、環境または
回線のノイズレベルを検出する手段と、前記環境または
回線を介して特定の送信局から送られてくる信号のレベ
ルを検出する手段と、前記ノイズレベルおよび信号のレ
ベルの比較に基づき最適の誤り訂正方式を選択する手段
と、選択された誤り訂正方式を前記特定の送信局に通知
する手段と、を設けたことを特徴とする。
The present invention comprises means for detecting the noise level of an environment or a line, and means for detecting the level of a signal transmitted from a specific transmitting station via the environment or the line. A means for selecting an optimum error correction method based on the comparison of the noise level and the signal level and a means for notifying the selected transmission station of the selected error correction method are provided.

【0008】[0008]

【作用】この発明のデータ通信装置では、環境または回
線のノイズレベルと、特定の送信局からの信号レベルと
を検出し、それぞれのレベル基づいて適切な誤り訂正方
式を選択する。この誤り訂正方式を前記特定の送信局に
通知してリンクを確立する。
In the data communication apparatus of the present invention, the noise level of the environment or the line and the signal level from the specific transmitting station are detected, and an appropriate error correction method is selected based on each level. The error correction method is notified to the specific transmitting station to establish the link.

【0009】これにより、ノイズレベルが高い環境にお
いては効率がある程度低くても誤り訂正能力の高い方式
を用いることによりデータ伝送可能とし、ノイズレベル
が低く環境の良い所では、冗長性の低い符号を用いて伝
送のデータを伝送速度を向上できるという効果が得られ
る。なお、この発明は無線データ伝送,有線データ伝送
の何れにも適用することができる。
As a result, in an environment with a high noise level, data can be transmitted by using a method with a high error correction capability even if efficiency is low to some extent. It is possible to obtain the effect that the transmission data can be used to improve the transmission speed. The present invention can be applied to both wireless data transmission and wired data transmission.

【0010】[0010]

【実施例】図面を参照してこの発明の実施例を説明す
る。
Embodiments of the present invention will be described with reference to the drawings.

【0011】図1はこの発明が適用される無線ネットワ
ークシステムの構成図である。このシステムでは複数の
無線端末局が図示のように配置され、無線でデータを送
受信する。各端末局は、図2に示すようにデータ端末装
置10、送受信機12、コントローラ11およびA/D
変換器13を備えている。データ端末装置10は、例え
ばパーソナルコンピュータやPOS端末装置のようにデ
ータ処理機能およびデータの入出力機能を備えているも
のである。データは電文形式に編集されて送受される。
コントローラ11は送受信周波数を制御するとともに受
信した電文が自局宛であるか否かを識別する。A/D変
換器13は送受信機12が受信した信号をディジタル化
してデータ端末装置10に出力する。データ端末装置1
0は入力されたディジタル信号からノイズと目的信号と
を分離してそのレベルを比較する。この比較によって通
信環境を割り出し、最適な誤り訂正符号を決定する。誤
り訂正符号としては、ハミング符号やハーゲルバーガー
符号などが用いられる。
FIG. 1 is a block diagram of a wireless network system to which the present invention is applied. In this system, a plurality of wireless terminal stations are arranged as shown in the drawing and wirelessly transmit and receive data. Each terminal station includes a data terminal device 10, a transceiver 12, a controller 11 and an A / D as shown in FIG.
The converter 13 is provided. The data terminal device 10 is provided with a data processing function and a data input / output function like a personal computer or a POS terminal device, for example. The data is edited in a message format and sent and received.
The controller 11 controls the transmission / reception frequency and identifies whether the received electronic message is addressed to itself. The A / D converter 13 digitizes the signal received by the transceiver 12 and outputs it to the data terminal device 10. Data terminal 1
0 separates noise and target signal from the input digital signal and compares the levels. The communication environment is determined by this comparison, and the optimum error correction code is determined. A Hamming code, a Hagelberger code, or the like is used as the error correction code.

【0012】各無線端末局はデータ端末装置10に図3
に示すリンクテーブルを備えている。このリンクテーブ
ルは、他の無線端末局と交信する際に用いるべき誤り訂
正符号を記憶したものである。受信時の誤り訂正符号は
他局から電文を受信したときのノイズレベル,エラー発
生率等に基づき、最適なものが選択される。この誤り訂
正符号は送信側の局に通知され、リンクが確立する。自
局が送信する際には相手局から予め指定されている誤り
訂正符号を付加して送信する。なお、送受信とも同じも
のを用いるようにしてもよい。
Each wireless terminal station is connected to the data terminal device 10 as shown in FIG.
The link table shown in is provided. This link table stores error correction codes to be used when communicating with other wireless terminal stations. The optimum error correction code at the time of reception is selected based on the noise level, the error occurrence rate, etc. when a message is received from another station. This error correction code is notified to the transmitting station and the link is established. When the local station transmits, an error correction code designated in advance by the partner station is added and transmitted. The same may be used for both transmission and reception.

【0013】図4は無線端末局の誤り訂正符号選択動作
を示すフローチャートである。まず、周囲環境のノイズ
を測定するシーケンスを実行する(n1)。すなわち目
的の信号のない状態で受信器を動作させてそのレベルを
検出する。こののち所定の端末局からの信号レベルの測
定シーケンスを実行する(n2)。このときには、その
端末局からテスト用の電文を送信してもらう。信号レベ
ルとノイズレベルの比に基づいて最適な誤り訂正符号を
決定する。誤り訂正符号には訂正能力が高いが冗長度の
大きいものやその逆のものがあるため現在の環境状態に
基づいて最適のものを選択する。選択した誤り訂正符号
を前記所定の端末局に対して伝達してリンクを確立する
(n5)。この動作を全ての端末局について行えば各端
末局に対して最適の方式でデータ伝送を行うことができ
る。さらに、各端末局がこの動作を行うことによって送
信,受信の各々について最適な誤り訂正符号を用いるこ
とができる。
FIG. 4 is a flowchart showing the error correction code selection operation of the wireless terminal station. First, a sequence for measuring noise in the surrounding environment is executed (n1). That is, the receiver is operated in the absence of the desired signal and its level is detected. After that, the measurement sequence of the signal level from a predetermined terminal station is executed (n2). At this time, ask the terminal station to send a test message. The optimum error correction code is determined based on the ratio of the signal level and the noise level. Since some error correction codes have a high correction capability but a large degree of redundancy and vice versa, the optimum code is selected based on the current environmental condition. The selected error correction code is transmitted to the predetermined terminal station to establish a link (n5). If this operation is performed for all terminal stations, data transmission can be performed to each terminal station in an optimum method. Further, each terminal station performs this operation so that the optimum error correction code can be used for each of transmission and reception.

【0014】この動作は1日に一度運用開始時に行うよ
うにしてもよく、適宜行うようにしてもよい。また、エ
ラー率が一定以上になったとき、設定しなおすようにし
てもよい。
This operation may be performed once a day at the start of operation, or may be performed appropriately. Further, when the error rate exceeds a certain level, it may be reset.

【0015】なお、上記実施例では誤り訂正符号を選択
する動作およびテーブルの記憶をデータ端末装置10に
担当させたが、コントローラ11に担当させてもよい。
In the above embodiment, the data terminal device 10 was in charge of the operation of selecting the error correction code and the storage of the table, but the controller 11 may be in charge of it.

【0016】[0016]

【発明の効果】以上のようにこの発明によれば、最適な
誤り訂正符号を用いることができるため、最も効率的に
確実な通信を確保することができる。
As described above, according to the present invention, since the optimum error correction code can be used, the most efficient and reliable communication can be secured.

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

【図1】この発明の実施例が適用される無線ネットワー
クの構成を示す図
FIG. 1 is a diagram showing a configuration of a wireless network to which an embodiment of the present invention is applied.

【図2】同無線ネットワークの各無線端末局の構成を示
す図
FIG. 2 is a diagram showing a configuration of each wireless terminal station of the wireless network.

【図3】同無線端末局のテーブルを示す図FIG. 3 is a diagram showing a table of the wireless terminal station.

【図4】同無線端末局の動作を示すフローチャートFIG. 4 is a flowchart showing the operation of the wireless terminal station.

【手続補正書】[Procedure amendment]

【提出日】平成4年6月22日[Submission date] June 22, 1992

【手続補正1】[Procedure Amendment 1]

【補正対象書類名】明細書[Document name to be amended] Statement

【補正対象項目名】特許請求の範囲[Name of item to be amended] Claims

【補正方法】変更[Correction method] Change

【補正内容】[Correction content]

【特許請求の範囲】[Claims]

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 環境または回線のノイズレベルを検出す
る手段と、前記環境または回線を介して特定の送信局か
ら送られてくる信号のレベルを検出する手段と、前記ノ
イズレベルおよび信号のレベルの比較に基づき最適の誤
り訂正方式を選択する手段と、選択された誤り訂正方式
を前記特定の送信局に通知する手段と、を設けたことを
特徴とする無線データ通信装置。
1. A means for detecting the noise level of an environment or a line, a means for detecting the level of a signal sent from a specific transmitting station via the environment or the line, and a means for detecting the noise level and the level of the signal. A wireless data communication device comprising: means for selecting an optimum error correction method based on comparison; and means for notifying the selected transmission station of the selected error correction method.
JP12060892A 1992-05-13 1992-05-13 Data communication equipment Pending JPH05316082A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12060892A JPH05316082A (en) 1992-05-13 1992-05-13 Data communication equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12060892A JPH05316082A (en) 1992-05-13 1992-05-13 Data communication equipment

Publications (1)

Publication Number Publication Date
JPH05316082A true JPH05316082A (en) 1993-11-26

Family

ID=14790460

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12060892A Pending JPH05316082A (en) 1992-05-13 1992-05-13 Data communication equipment

Country Status (1)

Country Link
JP (1) JPH05316082A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6920150B1 (en) 1997-09-30 2005-07-19 Lucent Technologies Inc. Adaptive communications transcoding and error control
JP2009088987A (en) * 2007-09-28 2009-04-23 Panasonic Electric Works Co Ltd Communication system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6920150B1 (en) 1997-09-30 2005-07-19 Lucent Technologies Inc. Adaptive communications transcoding and error control
JP2009088987A (en) * 2007-09-28 2009-04-23 Panasonic Electric Works Co Ltd Communication system

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