SU902284A2 - Device for detecting errors in discrete informatoin transmission systems with solving feedback - Google Patents

Description

information transmitted in the presence of interference in the feedback channel affecting the transmitted information.

The purpose of the invention is to increase the reliability of the transmitted information.

This goal is achieved by transmitting the transfer synchronizer, key, counter, control register and command analyzer, the input and output of which are connected to the input and additional output of the control unit, respectively, the first output of which is connected to the first input of the counter, the first key input and to the transfer synchronizer input, the first and second outputs of which are connected to the additional inputs of the register of the number of pushing pulses, and the third output is connected to the additional input of the temporary accumulation the body whose output is connected via a serially connected key and counter to the second input of the input unit; the first output of the control unit through the control register is connected to the third input of the counter, the output of which is connected to the combined third input of the key and the fourth input of the switching unit, and the receiving part is entered into the reception synchronizer, whose input is connected to the first output of the control unit, and the first and second outputs are connected to the additional inputs of the forward pulse number register, with the first output synchronizer output is connected to the combined additional inputs of the temporary storage device and the output block.

FIG. Figures 1 and 2 show the structural electrical diagrams of the transmitting and receiving parts of the device, respectively.

The transmitting part contains an input unit 1, a temporary storage 2, a control unit 3, a recurrent register C, an output unit 5, a propulsive pulser generator 6, a register of propulsive pulses number 7, a sensor 8 of check combinations, a switching block 9, a control register 10, a counter 11, key 12, command analyzer 13, transfer synchronizer 14

The receiving part contains an input unit 15, a recurrent register 1b, a propulsive pulse generator 17, a register 18 number of advancing pulses, a decisive block 19, a control block 20, a temporary storage 21, a check pattern sensor 22, an output block 23, a reception synchronizer 2k.

The device works as follows.

In the initial state, in the registers 7 and 18 of the number of pushing pulses of the transmitting and receiving parts, a service information block B of length n is stored, stored in the transmission synchronizer and the reception synchronizer, the first input of the switching unit 9 is open, the fourth input is closed, the key 12 is closed, the first the input of the counter 11 is closed.

In the transmitting part (Fig. 1), the information combination I. of the lengths of m characters from the information source enters input block 1, from which it is sent to temporary storage 2 and through switching unit 9 to the n-bit recurrent register 4. In the latter, to the information The combinations are attached to the g check characters from the sensor 8 check combinations to form a block B length. The block B comes from the recurrent register 4 to the register 7 of the number of pushing impulses, from where the block Bd is previously transmitted to the generator of the 6 pushing pulses. Thus, the information is advanced through the recurrent register by a burst of pulses, the number of which is determined by the combination of the service block BO (for the transmitted block B, the combination of the previous block B |,), thereby entering

correlation between the transmitted blocks is necessary. As a result of conversion, the obtained in the recurrent register 4 Bqd (or BK) is sent through the output block 5 to the communication channel, which with some probability may be distorted

In the receiving part (Fig. 2) of the communication channel, through the input unit 10 enters the recurrent register 16 for the inverse random transformation under the influence of the advancing pulses of the generator 17 of the advancing pulses, the number of which is determined by the value of the BO combination ((or B | for the BC block) the number of advancing pulses in the register 18. After the inverse transformation, the resulting combination is sent to the register of the number 18 of the advancing pulses for decoding the ACU, (or) and to the temporary memory 21, and the received test symbols S are received in decision block 19, where they are compared with the check symbols from the check pattern sensor 22, which operates synchronously with the similar sensor 8 on the transmitting side. Next, the result of the comparison goes to the control block 20. In the event that the check symbols match, the control block 20 returns communication channel command of the receipt of the correct reception.

Having received the command of the Receipt, the analyzer 13 of the commands allows, through the control unit 3, to process the next block of information B- and output the VC. to the communication channel.

After arriving at the receiving part of the ACU; (and processing it, the control unit 20 (in case of verification) characters) issues a command to the output unit 23 to issue the information combination and to the consumer.

In the case of a mismatch of check symbols, the control unit 20 issues a command to close the input unit 15 and the output unit 23 and issues the Request command to the reverse link. At the same time, a command is issued to the reception synchronizer 2k, from the second output of which a signal erasing the information contained in them is fed to the inputs of the register 18 of the number of advance pulses and the temporary accumulator 21. The same signal is fed to the input of the output unit 23, prohibiting the issuance of information. Then, from the first output of synchronizer 2 of reception to the register 18 of the number of advancing pulses, the value of the block of service information of the BO is rewritten.

The command A request via a reverse communication channel is sent to the command analyzer 13, which, through the control unit 3, places the transmitting part in the retransmission mode.

In the case of reception on the reverse channel of information and the impossibility due to errors that occurred during its transmission over the reverse channel, it is uniquely identified with the Query or Receipt command, the command analyzer 13 also places the transmitting part in the retransmission mode.

In this case, the control unit 3 issues a command through the second inputs to close the input unit, open the fourth input and close the first input of the switching unit 9, open the first input of the counter 11, open the first key input 12.

At the same time, a command is issued to the transfer synchronizer 1, which erases the block of information in the BH register 7 of the number of forward pulses and records the block of service information of the control unit. At the end of the recording of the BO in the register 7, the number of pushing pulses from the third output of the transfer synchronizer to the third input of the temporary accumulator 2 receives a command to re-issue the information block, beginning with and (generally from I.), which through the fourth input of the switching block поступ arrive to the input of the recurrent register k and simultaneously via the public key 12 are again overwritten into the temporary storage 2. The number of transmitted information combinations and is counted by the counter 11 and after calculating the X information com Inácio from the first output of the counter 11 is output to the opening command input section 1, closing switch 12, the opening and closing of the first input of the fourth input of the switching unit 9, closing the first input of the counter 11.

Upon receipt of the Receipt command, input IC is received in input block 1, which is processed according to the algorithm described above.

If during the retransmission, the receiving part detects an error in the received block, a Request command is sent to the reverse communication channel for the second time. According to this command, the control register 10 shifts the information blocks in temporary storage 2 so that the output cell has an AND-x1-1 block, simultaneously swatches the counter 11, the synchronizer 14 transfers again. Writes the number of operating pulses to the register 7 information BO and starts a temporary drive 2 and the cycle of retransmission of information is repeated.

When a false command is received, or an error is received in the received information channel, the transmitting part starts the retransmission of information, the first block of which the receiving part accepts as erroneous and issues the request command. The repeated information is transmitted using a well-known algorithm. The proposed device allows to significantly increase the reliability of the transmitted information.

Claims (1)

1. USSR author's certificate - 462296, cl. H L 1/10, 1972 (prototype). Riga.1