SU760474A1 - Device for transmitting and receiving information with error correction - Google Patents

Description

The invention relates to the technology __________

communication, in particular, to devices for improving the reliability of transmitting discrete information via communication channels by correcting errors.

A device for transmitting and receiving discrete information with error correction, containing on the transmitting side serially connected information source, a drive, a transfer switch, an encoding unit and a matching unit, the outputs of the buffer store and the control unit are connected to the other inputs of the transfer switch; connected to the input of the service command sensor, and on the receiving side - a matching unit, the outputs of which are connected via one of the decoder service commands to one of inputs of the control unit, as well as a decoding unit and serially connected receiving buffer storage and information receiver

However, the known device for transmitting and receiving discrete information with error correction has insufficient speed.

2

The aim of the invention is to improve the speed of T ’; - For this, a device for transmitting and receiving discrete information from

5 error correction, containing on the transmitting side sequentially connected information source, accumulator, transfer switch, coding block and block of approvals, and

South to the other inputs of the transfer switch are connected respectively to the outputs of the buffer accumulator and the control unit, another output of which is connected to the input of the service command sensor,

15 and at the receiving side — a matching unit, the outputs of which are connected to one of the inputs of the control unit through the decoder of service commands, as well as a decoding unit and successively connected receiving buffer storage and information receiver, a memory unit inserted between the output unit alignment and one of

25 additional inputs of the transfer switch, the additional outputs of which are connected respectively to the Д input of the buffer storage device and to the other input of the matching unit, and the output

30 Service Command Spy Connected

3 ...... 760474

A receive switch is inserted into another auxiliary input of the transfer switch and a receiving switch is connected to the receiving side, the control output of the decoding unit is connected to the corresponding input of the control unit, and the information outputs of the decoding unit and ³ additional output of the decoder service commands drive, with .this, the output of the matching unit is connected to the input of the decoder unit ... · /. ·

The drawing shows a structural electrical circuit of the proposed device. 15

A device for transmitting and receiving discrete information with error correction contains information source 1, storage 2, transfer switch 3, encoding 20 block 4, matching unit 5, buffer storage 6, control unit 7 and service command sensor 8 on the transmitting side, and on the lee side, the matching unit 9, the decoder of the service commands 10, ^ 5

the decoding unit 11, the receiving buffer storage unit 12 and the receiver of information 13, as well as on the transmitting side - a memory block of 14? * and on the receiving side - a receive switch 15 /.

The device works as follows. "

On the transmitting side, the information received from source 1 is divided into parts, encoded and, in the form of ^ 5 code blocks, for example, 320 bits each, is sent to the communication channel. Moreover, out of 320 bits of a code word, during normal operation, 240 bits are informational, and 80 bits are test ones. Simultaneously with the transfer of code blocks to communication channel 40, they are stored for a certain time interval ι * ,, On the receiving side, the code blocks are decoded, th 'information ^received: received in the receiving buffer 45 nako- Pytel 12, and then to the data receiver 13. If decodes find noispravlyaemuyu code error, then output a signal Requesting information that comes to pri- 50 omnuyu side which vtshaet Match to guide commands are sent hundred-; rone. The transmitting side a stops' issuing a new one and repeats the recorded) information from memory 14, and then “the incoming information from ⁵³ Information source 1 is recorded into the buffer memory ′. After repeating the information containing the previously received error code block, the "give accumulated during the" neurosurgery 60 information. / "

After the last questioning, after the expiration of; some of the ^ voyein of the Gubinterval, the release of the buffer storage 6 is started. For this purpose, decrease "- 65

The redundancy of code blocks, for example, by increasing the number of information bits, without changing the total number of code block symbols. If, for example, out of the 320 bits of the code block, 240 bits were previously informational, then now the number of information bits can be increased to 280, leaving 40 bits for the sequence of check characters. - Consequently, after transmitting eight code blocks with reduced redundancy, the number of code blocks recorded in buffer storage 6 will decrease by one. Thus, the buffer accumulator 6 is released, after which the transfer of the code blocks with the initial redundancy begins. On the reception side, decoding is carried out for two code structures parallelly. '’.

The source of information 1 continuously generates information that accumulates in the accumulator 2 and through the transfer switch 3 enters the matching unit 5 and simultaneously in the encoding unit 4 *. Each code block formed by adding to the information part a sequence of check symbols is transmitted to the communication channel and simultaneously recorded in memory block 14. At the receiving side, the information is decoded by the decoding unit 11, the decoding results determine the code of the received block, and then the received code block without an error or with an error correcting code after its subsequent correction, the information is transmitted through the reception switch 15 to the receiving buffer storage 12, and the expiration of the time is given to the recipient of information 13. In the case of a received code block with an uncorrectable error, the decoding block 11 sends a signal to the control unit 7 along the control circuits and simultaneously to the receive switch 15, block the information to the receive ’, buffer buffer 12. Control unit? includes the service command8 DSC and operates on the transfer switch 3, and the information request command is received along with the code-box codec. When this'New information from the source of information 1 enters the buffer drive b. After receiving the request information signal at the receiving side using the decoder / service commands 10, a corresponding control signal is issued to the control unit 7. The control 7 through the transfer switch 3 turns on the buffer accumulator b, 'The new information enters the buffer storage 6, acts on the service sensor, commands 8, which produces a signal information "

760474

This signal, in turn, enters the communication channel. Following the signal of rotation of information into the channel, the information from the memory block 14 is counted. The permission to read the rotary information is carried out,

transfer switch 3. ⁵

On the receiving side of the decoder service commands 10 is detected, the signal is correctly received information in the receiving buffer drive 12.

In this case, the recording of repeated information is carried out to that place in the receiving / buffer storage 12, on which information containing the block affected by the error would be recorded. Thus / way, there is a continuous collection of 15 information from the source and the continuous issuance of information to the recipient 13.

In order to avoid the situation associated with the overflow of the buffer storage 6 and the emptying of the reception buffer storage 12, which may occur after a series of re-interviews, the structure of the code block on the transmitting side changes, increasing the number of information chips at the same time. Transmitting code blocks are reduced redundancy as long as will not give a specific number of code blocks with the appearance ^ζ nyi further repeated, or to '_ as long as the buffer tank ^{30 June}

will not be released. After that, they proceed to work with the initial structure of the code block. At the receiving side, decoding for two code block structures in parallel.

In addition, the use of the proposed device makes it possible to increase the efficiency of using discrete communication channels. This can be shown by the example of the following calculation.

₍ Let it be necessary to transmit information with marginal distortions not exceeding cG = 8.33%. As is known, when transmitting discrete information with... Such a value of boundary distortions using the sliding index method with confirmation (CIP method) each bit of information must be transmitted = 3 bits. When b = velocity wiring 50 Bd ^"ee skoroe- minute transmission information D + = '9600 bit / s, the total number of channels determined telegraph} · divided as

E 9600 ,,

Luke 'ΒΤΊή' ~ ⁶⁴ '

According to the prototype, in normal operation (without asking) redundancy is allowed. For example, for each (_ _ _ bit of information is transmitted not sh = 3 bits,

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a t = 4, i.e. Discrete information is transmitted with marginal distortion of ¹ = 6.25%. In this case, the total number of channels will be determined as

9600

50 · 4

[We form a code block in 48x 5 = 240 bits. Selecting 205 bits for the information part, and 35 bits for the check bits, we get the final number of channels.

= 48 - = 41,

T, e, it took 7 channels to organize 'jamming coding. After the end of the re-interviews to release the buffer store 6, without changing the speed of information transfer in the communication channel, reduce the value of w to the desired value of w = 3, i.e. 3 bits are transmitted for each bit of information, which guarantees the required amount of edge distortion. Due to the difference in the speed of writing the number of bits and reading them from the buffer drive 6, it is released.

Suppose that the transmission of discrete information with all other things being equal, is carried out by the proposed device, ίThen the number of communication channels is ¹ ,. = 64. Highlighting

for the organization of jamming protection of 16 channels of communication, we finally get that the number of communication channels will be defined as

= 64 - 16 = 48,

that the value ΑΝ = Ν £ = 48-41 = 7 exceeds the number of communication channels formed when using the prototype.

We form a code block with the information part K = 48x4 = 192 bits and the test part £ = 16 * 4 = 64 bits. It is easy to see that in the normal mode, the proposed device provides certain advantages in error protection: in the prototype, 205 information bits are protected by a polynomial of degree 35, and when transmitting discrete information using the proposed device, the information sequence in 192, b is protected by a polynomial of 64.

After the end of the re-inquiry, we increase the number of information symbols, for example, by reducing the number of check bits by ΔΚ = 24. Then the code block will have the following structure: the information part 192 + 24 = 216 bits, and the sequence of check symbols 62 - 24 = 40 bits. Then, when transferring 8 code blocks (192: 24) in buffer buffer 6, the number of recorded ones will decrease by one during the replay of code blocks. In addition, it can be seen that security in this case is not worse than in the prototype: 216 information bits are protected by a sequence of a polynomial of degree 40.

Thus, the use of the proposed device allows

48.

65

7,760,474

increase speed, which distinguishes it from the prototype.

Claims (1)

Claim A device for transmitting and receiving discrete information with error correction, containing on the transmitting side serially connected information source, a storage device, a transfer switch, an encoding unit and a matching unit ,. moreover, the other outputs of the transfer switch are connected. respectively, the outputs of the buffer store and the control unit, another output of which is connected to the sensor input of the service commands, and on the receiving side - a matching unit, the output of which is through the service command decoder is connected to as well as a decoding unit and serially connected receiving buffer accumulator and recipient of information, which are given by the fact that, in order to improve speed, a memory block is inserted on the transmitting side and connected between the output matching unit and one of the additional inputs transmission switch, _z additional vyhbda kotbrogo connected respectively to the input buffer to ^e storage ring and to the other input acceptance unit and Service command sensor output is connected to the other supplemental entry transfer switch, and at the receiving side introduced switch. reception, with the manager ^; the output of the decoding unit is connected to the corresponding input of the control unit, and the information outputs of the decoding unit and the additional output of the service command decoder through the receive switch are connected to The input of the receive buffer store, with the additional output of the matching unit connected to the input of the decoder unit.