JPH03123135A - Data transmission device - Google Patents

Data transmission device

Info

Publication number
JPH03123135A
JPH03123135A JP1260621A JP26062189A JPH03123135A JP H03123135 A JPH03123135 A JP H03123135A JP 1260621 A JP1260621 A JP 1260621A JP 26062189 A JP26062189 A JP 26062189A JP H03123135 A JPH03123135 A JP H03123135A
Authority
JP
Japan
Prior art keywords
transmission
error rate
data
data length
transmission path
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
JP1260621A
Other languages
Japanese (ja)
Inventor
Fumitaka Okamoto
文孝 岡本
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.)
NEC Corp
Original Assignee
NEC Corp
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 NEC Corp filed Critical NEC Corp
Priority to JP1260621A priority Critical patent/JPH03123135A/en
Publication of JPH03123135A publication Critical patent/JPH03123135A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To always execute an efficient data transmission by determining optimum transmitting data length in accordance with the quality of an error rate, etc., of the present transmission line. CONSTITUTION:In the case an input/output control part 2 in a communication control part 1 is receiving data from a transmission line 6 through a modulating/ demodulating part 5, the modulating/demodulating part 5 delivers prescribed analog value information related to receiving dat before demodulation to a transmission line error rate estimating part 4 in the communication control part 1. The transmission line error rate estimating part 4 estimates the present error rate of the transmission line 6, based on a history of this analog value information, and an optimum transmitting data length determining part 3 determines the present optimum transmitting data length, based on the estimated error rate. Also, the input/output control part 2 uses the optimum transmitting data length given from the optimum transmitting data length determining part 3 as transmitting data length of the next time. In such a way, the data transmission can be executed efficiently.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、伝送路を介して接続された相手データ伝送装
置との間で、誤り訂正符号を付加したデータの双方向伝
送を行うデータ伝送装置に関するものである。
[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a data transmission system that performs bidirectional transmission of data with an error correction code added to a partner data transmission device connected via a transmission path. It is related to the device.

〔従来の技術〕[Conventional technology]

従来、この種のデータ伝送装置においては、相手データ
伝送装置に対し送信すべきデータが準備された場合、予
め定められた送信データ長ずつデータを切り出し、各デ
ータに誤り訂正符号を付加し伝送路を介して相手データ
伝送装置に送出していた。そして、従来においては、上
記の送信データ長は固定されたものになっていた。
Conventionally, in this type of data transmission device, when data to be transmitted to the other party's data transmission device is prepared, the data is cut out by a predetermined transmission data length, an error correction code is added to each data, and the data is sent over the transmission path. was sent to the other party's data transmission device via. Conventionally, the above-mentioned transmission data length has been fixed.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

上述した従来のデータ伝送装置においては、伝送路の誤
り率が事前に判明しており且つその誤り率が変化しなけ
れば問題はないが、誤り率が不明な場合には送信データ
長の最適化が困難であって効率の良いデータ伝送を行う
ことが難しく、また当初の誤り率が判明していても、誤
り率が成る不定時間経過後に変化する伝送路の場合には
、やはり効率の良いデータ伝送を行うことが難しくなる
In the conventional data transmission device described above, there is no problem if the error rate of the transmission path is known in advance and the error rate does not change, but if the error rate is unknown, it is necessary to optimize the transmission data length. It is difficult to perform efficient data transmission, and even if the initial error rate is known, in the case of a transmission path where the error rate changes after an indefinite period of time, it is still difficult to perform efficient data transmission. It becomes difficult to perform transmission.

すなわち、伝送路の誤り率が高い場合、送信データ長が
長いと誤り訂正符号による訂正能力を超えた誤りが発生
するために再送処理が頻発してデー夕伝送効率が低下し
、また伝送路の誤り率が低い場合、より長い送信データ
長で送信が行えるにもかかわらず固定された送信データ
長で送信が続けられることから、効率良くデータ送信す
ることができなくなる。
In other words, when the error rate of the transmission path is high, if the length of the transmitted data is long, errors that exceed the correction ability of the error correction code will occur, resulting in frequent retransmission processing, reducing data transmission efficiency, and reducing the transmission path efficiency. When the error rate is low, even though transmission can be performed with a longer transmission data length, transmission continues with a fixed transmission data length, making it impossible to efficiently transmit data.

そこで本発明の目的は、伝送路の誤り率の変化に応じて
送信データ長を変更することにより、効率良くデータ伝
送を行うことができるデータ伝送装置を提供することに
ある。
SUMMARY OF THE INVENTION An object of the present invention is to provide a data transmission device that can efficiently transmit data by changing the transmission data length in accordance with changes in the error rate of a transmission path.

〔課題を解決するための手段〕[Means to solve the problem]

本発明は上記の目的を達成するために、伝送路を介して
接続された相手データ伝送装置との間で、誤り訂正符号
を付加したデータの双方向伝送を行うデータ伝送装置に
おいて、前記相手データ伝送装置から受信したデータに
かかる所定のアナログ値情報の履歴に基づいて前記伝送
路の現在の誤り率等の品質を推定する推定手段と、この
推定手段で推定された前記伝送路の品質に基づいて送信
データ長を決定する送信データ長決定手段とを有してい
る。
In order to achieve the above object, the present invention provides a data transmission device that performs two-way transmission of data to which an error correction code has been added, between the data transmission device and the partner data transmission device connected via a transmission path. estimating means for estimating the current quality of the transmission path, such as the error rate, based on the history of predetermined analog value information regarding data received from the transmission device; and based on the quality of the transmission path estimated by the estimating means. and a transmission data length determining means for determining the transmission data length.

一つの意味のある処理単位に変換する機能等を有してい
る。そして、本実施例ではそのような通信制御部1内に
、入出力制御部2.最適送信データ長決定部3および伝
送路誤り率推定部4を設けている。
It has functions such as converting it into a single meaningful processing unit. In this embodiment, such a communication control section 1 includes an input/output control section 2. An optimum transmission data length determining section 3 and a transmission path error rate estimating section 4 are provided.

伝送路誤り率推定部4は、伝送路6を介して伝送相手か
ら受信したデータにかかる所定のアナログ値情報の履歴
に基づいて伝送路6の現在の誤り率を推定する部分であ
り、その構成例を第2図に示す。第2図において、41
は、変復調部5より受信データにかかる所定のアナログ
値情報の受は取りを行う、受信データのアナログ値情報
受は取り部(以下、受は取り部と略す)であり、42は
、受は取り部41で受は取られた情報を過去一定量分蓄
積する、過去の受信データのアナログ値格納部(以下、
アナログ値格納部と略す)であり、43は、アナログ値
格納部42に格納されている情報から現在の伝送路6の
誤り率を推定する推定部であり、この推定された誤り率
が第1図の最適送信データ長決定部3に与えられる。な
お、(it定部〔作用〕 本発明のデータ伝送装置においては、推定手段が、相手
データ伝送装置から受信したアナログ値情報の履歴に基
づいて伝送路の現在の品質を推定し、送信データ長決定
手段が、その推定された品質に基づいて送信データ長を
決定する。
The transmission path error rate estimating unit 4 is a part that estimates the current error rate of the transmission path 6 based on the history of predetermined analog value information regarding data received from the transmission partner via the transmission path 6, and has the following configuration: An example is shown in FIG. In Figure 2, 41
42 is a receiving section (hereinafter referred to as receiving section) which receives and receives predetermined analog value information related to received data from the modulation/demodulation section 5. A past received data analog value storage unit (hereinafter referred to as
43 is an estimation unit that estimates the error rate of the current transmission path 6 from the information stored in the analog value storage unit 42, and this estimated error rate is the first error rate. The data is given to the optimum transmission data length determining section 3 in the figure. In the data transmission device of the present invention, the estimating means estimates the current quality of the transmission path based on the history of analog value information received from the other party's data transmission device, and estimates the transmission data length. A determining means determines a transmission data length based on the estimated quality.

〔実施例〕〔Example〕

次に、本発明の実施例について図面を参照して詳細に説
明する。
Next, embodiments of the present invention will be described in detail with reference to the drawings.

第1図は本発明のデータ伝送装置の一実施例の構成図で
あり、通信制御部1と、これと伝送路6との間に設けら
れディジタル信号と伝送路6を伝送されるアナログ信号
との間の変換を行うと共に受信したデータにかかる所定
のアナログ値情報を出力する機能を有する変復調部5と
で構成されている。通信制御部1は、伝送路6および変
復調部5を介して伝送されるデータ信号の送受信制御を
行う機能を有すると共に、後述する入出力制御部2や図
示しないコンピュータ内部での処理形式への変換機能つ
まり0と1からなる信号をまとめて43は例えば統計的
手法により現在の伝送路6の誤り率を推定するものであ
り、アナログ値格納部42は推定部43が現在の誤り率
を推定するに十分な有限個の過去の受信データにかがる
アナログ値情報を保持するものである。
FIG. 1 is a configuration diagram of an embodiment of the data transmission device of the present invention, in which a communication control section 1, a digital signal provided between this and a transmission path 6, and an analog signal transmitted through the transmission path 6 are connected. The modulation/demodulation section 5 has a function of performing conversion between data and outputting predetermined analog value information regarding received data. The communication control unit 1 has a function of controlling the transmission and reception of data signals transmitted via the transmission path 6 and the modulation/demodulation unit 5, and also performs conversion into a processing format within the input/output control unit 2 (described later) and a computer (not shown). The function 43, which collects signals consisting of 0 and 1, is to estimate the current error rate of the transmission path 6 by, for example, a statistical method, and the analog value storage unit 42 is used by the estimation unit 43 to estimate the current error rate. It holds analog value information based on a finite number of past received data.

再び第1図を参照すると、最適送信データ長決定部3は
、伝送路誤り率推定部4で推定された誤り率に基づいて
現在の最適な送信データ長を決定する部分であり、その
構成例を第3図に示す。同図において、31は、第1図
の伝送路誤り率推定部4から与えられる誤り率に従って
、現在の最適送信データ長を求める決定部であり、具体
的には、誤り率が高いときには送信データ長を短くし、
その逆に誤り率が低いときには送信データ長を長くする
。また32は、決定部31で決定された最適送信データ
長を格納する最適送信データ長格納部であり、ここに格
納された最適送信データ長が第1図の入出力制御部2に
与えられる。
Referring again to FIG. 1, the optimal transmission data length determining section 3 is a section that determines the current optimal transmission data length based on the error rate estimated by the transmission path error rate estimating section 4, and an example of its configuration is shown below. is shown in Figure 3. In the same figure, 31 is a determining unit that determines the current optimum transmission data length according to the error rate given from the transmission path error rate estimating unit 4 of FIG. shorten the length,
Conversely, when the error rate is low, the transmission data length is increased. Reference numeral 32 denotes an optimum transmission data length storage section that stores the optimum transmission data length determined by the determination section 31, and the optimum transmission data length stored here is given to the input/output control section 2 in FIG.

第1図の入出力制御部2は、変復調部5とのインタフェ
イス機能を持ち、入出力データの送受信動作(誤り訂正
関連を含む)を行うと共に、それに伴う手順の制御を行
っている。そして本実施例では、この入出力制御部2は
、最適送信データ長決定部3から与えられる最適送信デ
ータ長を次回の送信データ長として用いるものである。
The input/output control unit 2 in FIG. 1 has an interface function with the modulation/demodulation unit 5, and performs input/output data transmission/reception operations (including error correction-related operations), as well as controlling procedures associated therewith. In this embodiment, the input/output control section 2 uses the optimum transmission data length given from the optimum transmission data length determination section 3 as the next transmission data length.

以下、このように構成された本実施例の動作を説明する
The operation of this embodiment configured as described above will be explained below.

第1図に示したように、変復調部5を介して通信制御部
1が伝送路6に接続されたデータ伝送装置において、通
信制御部1内の入出力制御部2が変復調部5を通して伝
送路6よりデータを受信している場合、変復調部5は復
調前の受信データにかかる所定のアナログ値情報を通信
制御部1内の伝送路誤り率推定部4に渡す。
As shown in FIG. 1, in a data transmission device in which a communication control unit 1 is connected to a transmission line 6 via a modem unit 5, an input/output control unit 2 in the communication control unit 1 connects to a transmission line via a modem unit 5. 6, the modulation/demodulation section 5 passes predetermined analog value information regarding the received data before demodulation to the channel error rate estimation section 4 in the communication control section 1.

伝送路誤り率推定部4においては、第2図の受は取り部
41が変復調部5から復調前の受信データにかかるアナ
ログ値情報を受は取り、アナログ値格納部42に格納す
る。そして、推定部43は、そのアナログ値格納部42
に推定するに十分な過去の有限個の受信データにかかる
アナログ値情報σ2のガウス分布と考えることができる
。この伝送路の確率分布関数f (x)は、送信シンボ
ル“0”“1”の発生確率が等しいという条件の下では
、f (x) −p (x; μ、σ2)と表せる。ま
た、伝送路のS/N比延いては伝送路の誤り率を推定す
るということは、伝送路の雑、音の分散σ2を推定する
ことと同じである。そこで、第1図の変復調部5では各
サンプリング時におけるアナログ信号の電圧値(Xりを
アナログ値情報として伝送路誤り率推定部4に伝達し、
第2図の受は取り部41はそれを受は取ってアナログ値
格納部42に格納し、推定部43では以下のようにして
伝送路の雑音の分散σ2を推定するものである。即ち、
未知母数をσハ=分散)とすれば、V(x) =E [
(x−o”)] =S―(x−o)”f(x)dx が揃っていると、所定時間毎に統計的手法を用いて現在
の伝送路6の誤り率を推定し、その推定値を最適送信デ
ータ長決定部3に渡す。
In the transmission path error rate estimating section 4, a receiving section 41 shown in FIG. The estimating unit 43 then uses the analog value storage unit 42
It can be thought of as a Gaussian distribution of analog value information σ2 related to a finite number of received data in the past sufficient to estimate . The probability distribution function f (x) of this transmission path can be expressed as f (x) −p (x; μ, σ2) under the condition that the probabilities of occurrence of transmission symbols “0” and “1” are equal. Furthermore, estimating the S/N ratio of the transmission path and the error rate of the transmission path is the same as estimating the noise of the transmission path and the dispersion σ2 of sound. Therefore, the modulation/demodulation unit 5 in FIG. 1 transmits the voltage value (X) of the analog signal at each sampling time to the transmission path error rate estimation unit 4 as analog value information,
The receiving unit 41 in FIG. 2 receives the received signal and stores it in the analog value storage unit 42, and the estimating unit 43 estimates the noise variance σ2 of the transmission path as follows. That is,
If the unknown parameter is σ = variance), then V(x) = E [
(x-o”)] =S-(x-o)”f(x)dx, the error rate of the current transmission path 6 is estimated using a statistical method at predetermined intervals, and the The estimated value is passed to the optimum transmission data length determining section 3.

最適送信データ長決定部3においては、第3図の決定部
31が伝送路誤り率推定部4から受は取った現在の伝送
路6の誤り率の推定値に基づいて最適送信データ長を決
定し、それを最適送信データ長格納部32に格納する。
In the optimum transmission data length determination unit 3, the determination unit 31 shown in FIG. and stores it in the optimum transmission data length storage section 32.

入出力制御部2は、受信が終了し、送信を行う時に最適
送信データ長決定部3内の第3図の最適送信データ長格
納部32から現在の最適送信データ長を参照して、これ
を今回の送信に用いてデータの送信を行う。
When the input/output control unit 2 completes reception and performs transmission, it refers to the current optimum transmission data length from the optimum transmission data length storage unit 32 in FIG. Data is sent using this transmission.

次に、伝送路誤り率推定部4の具体例について説明する
。例としては、同期位相変調方式(coherent 
PSK system)による伝送路を採り上げる。−
般に同期位相変調方式では、変復調部5で行われるサン
プリング時におけるアナログ信号の電圧分布は、°“1
°゛、“0”のそれぞれの信号に対して第4図に示すよ
うにμ、−μを平均値とする分散=−(σ2+μ2+σ
2+μ2) =σ2+μ2 となることにより、推定部43は次式により推定量σ寡
を求める。
Next, a specific example of the transmission path error rate estimation section 4 will be explained. An example is the synchronous phase modulation method (coherent
We will discuss the transmission path using the PSK system. −
Generally, in the synchronous phase modulation method, the voltage distribution of the analog signal at the time of sampling performed in the modulation/demodulation section 5 is
As shown in Figure 4 for the signals of °゛ and “0”, the variance with μ and −μ as average values = −(σ2+μ2+σ
2+μ2) =σ2+μ2, the estimation unit 43 calculates the estimated amount σ by the following equation.

σ”=V(x)−μ2 る。σ”=V(x)−μ2 Ru.

y=Σ x、t で表せる。ここで、f (y)は、非心度がμ2/σ2
の非小12分布に従う。よって、 0 となり、推定精度は、 となる。
It can be expressed as y=Σ x,t. Here, f (y) has noncentrality μ2/σ2
It follows the non-small 12 distribution of Therefore, it becomes 0, and the estimation accuracy becomes as follows.

以上、本発明の実施例について説明したが、本発明は以
上の実施例に限定されるものではなく、その他各種の付
加変更が可能であり、伝送路も有線に限られず、無線で
あっても良い。
Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various other additions and changes are possible, and the transmission path is not limited to wired, but may also be wireless. good.

[発明の効果] 以上説明したように、本発明のデータ伝送装置において
は、現在の伝送路の誤り率等の品質に応じて最適な送信
データ長を決定し、この決定した送信データ長でデータ
の送信を行うので、常に効率の良いデータ伝送が実現で
きる。
[Effects of the Invention] As explained above, in the data transmission device of the present invention, the optimum transmission data length is determined according to the quality such as the error rate of the current transmission path, and the data is transmitted using the determined transmission data length. data transmission, so efficient data transmission can always be achieved.

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

第1図は本発明の一実施例の構成図、 第2図は伝送路誤り率推定部4の構成例を示す図、 1 第3図は最適送信データ長決定部3の構成例を示す図お
よび、 第4図は同期位相変調方式のサンプリング時における信
号電圧の確率分布を示す図である。 図において、 1・・・通信制御部 2・・・入出力制御部 3・・・最適送信データ長決定部 4・・・伝送路誤り率推定部 5・・・変復調部 6・・・伝送路
1 is a diagram showing a configuration of an embodiment of the present invention; FIG. 2 is a diagram showing an example of the configuration of the transmission path error rate estimating section 4; 1 FIG. 3 is a diagram showing an example of the configuration of the optimal transmission data length determining section 3 FIG. 4 is a diagram showing the probability distribution of signal voltage during sampling in the synchronous phase modulation method. In the figure, 1... Communication control section 2... Input/output control section 3... Optimum transmission data length determination section 4... Transmission path error rate estimation section 5... Modulation/demodulation section 6... Transmission path

Claims (1)

【特許請求の範囲】 伝送路を介して接続された相手データ伝送装置との間で
、誤り訂正符号を付加したデータの双方向伝送を行うデ
ータ伝送装置において、 前記相手データ伝送装置から受信したデータにかかる所
定のアナログ値情報の履歴に基づいて前記伝送路の現在
の品質を推定する推定手段と、該推定手段で推定された
前記伝送路の品質に基づいて送信データ長を決定する送
信データ長決定手段とを具備したことを特徴とするデー
タ伝送装置。
[Scope of Claims] In a data transmission device that performs bidirectional transmission of data with an error correction code added to a partner data transmission device connected via a transmission path, the data received from the partner data transmission device estimating means for estimating the current quality of the transmission path based on a history of predetermined analog value information related to the transmission path; and a transmission data length for determining the transmission data length based on the quality of the transmission path estimated by the estimating means. 1. A data transmission device comprising: determining means.
JP1260621A 1989-10-05 1989-10-05 Data transmission device Pending JPH03123135A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1260621A JPH03123135A (en) 1989-10-05 1989-10-05 Data transmission device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1260621A JPH03123135A (en) 1989-10-05 1989-10-05 Data transmission device

Publications (1)

Publication Number Publication Date
JPH03123135A true JPH03123135A (en) 1991-05-24

Family

ID=17350470

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1260621A Pending JPH03123135A (en) 1989-10-05 1989-10-05 Data transmission device

Country Status (1)

Country Link
JP (1) JPH03123135A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002064473A (en) * 2000-07-18 2002-02-28 Eastman Kodak Co Packet data transmission system for sending wireless image data

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002064473A (en) * 2000-07-18 2002-02-28 Eastman Kodak Co Packet data transmission system for sending wireless image data

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