SU809615A1 - Devise for transmitting and receiving discrete information with error correction - Google Patents

Description

The invention relates to communications and can be used in discrete information transmission systems.

A device is known for transmitting and receiving discrete information with error correction, comprising, in transmission, a series-connected information source, a switch and a memory unit, the output of which is connected to another information input of the co-commutator, and series-connected encoder and driver of the output signal, and at the reception, series-connected block a signal extraction unit, an input storage device, 15 a recording control unit, a reception storage device and a consumer, and the output of the signal extraction unit through a decoder is connected to one th inputs of the block for receiving overhead information 20 to the other input of which is connected to the output drive input [1].

However, the known device provides a relatively low bandwidth channel.

The purpose of the invention is to increase the bandwidth of the channel.

To achieve this goal, an adder is inserted into the known transmission device, included between the 30 output of the switch and the encoder input, combined with another input of the output signal shaper, and at the reception, a counter of received blocks and a shaper of the receipt signal are connected in series, and the other input of which is connected the query drive output, and a series-connected acknowledgment number recovery unit, a receipt signal decoder and an additional memory unit, the output of which is connected to the corresponding to the input of the decoder of the receipt signal, while the synchronizing inputs of the recovery unit of the acknowledging number and the counter of the received blocks are connected to the synchronizing output of the signal extraction block, the output of the counter of the received blocks is connected to the signal input of the recording control unit, the output of the decoder is connected to the input of the query drive and to the corresponding input recording control unit, the output of the service information receiving unit is connected to another input of the acknowledgment number recovery unit and through a signal desirator receipts - to the control input of the switch, and the output

80E615 of the shaper of the receipt signal is connected to another input of the adder in transmission.

The drawing shows a structural electrical diagram of the proposed device. 5

A device for transmitting and receiving discrete information with error correction contains on the transmitting side an information source 1, switch 2, encoder 3, output ... signal shaper 4, memory unit 5 and adder 6, on the receiving side - receipt signal decoder 7, additional unit 8 memory, signal extraction unit 9, input drive 10, decoder 11, recording control unit 12, reception information block 13 ^ 5, reception drive 14, consumer 15, counter 16 received blocks _; drive 17 requests, shaper 18 of the receipt signal and block 19 recovery 20 acknowledgment numbers.

The device operates as follows. . _

On the transmitting side ·, the discrete signal coming from source 1 is divided into blocks in switch 2, each of which is supplemented by 6 service bits in the adder, and in the shaper 4, by the check bits generated in encoder 3. From shaper 4, the signal enters through block 9 (not indicated) to block 9. At the same time, the information part of the block is recorded in block 5 in case of a repetition.

On the receiving side, the received discrete signal through block 9 passes to the input of the decoder 11 and the input drive 10. In block 9, using a particular method of cyclic phasing, a sequence of pulses is generated, 40 marking the boundaries of the blocks in the received signal. " These pulses through the synchronizing output of block 9 are fed to the counter 16 and block 19. In the decoder 11, the received block is checked for errors in it.

If the decoder 11 does not detect errors in the received code block, then the information part of the block from the input drive 10 through the block .12 is transferred to the drive 14 to the place determined by the counter 16, and after a while, the consumer Ao 15 is output. At the same time, the service part of the block is overwritten through block 13 partially to block 19 (two low-order bits of the acknowledgment number) and partially to decoder 7 (bits that indicate the detection of errors on the opposite side in this and the previous code blocks). In block 19, the received two £ Q are younger the digits of the acknowledgment number and the signals coming from the synchronizing output of block 9, a complete acknowledgment number is generated, which is received by the decoder 7. Using the acknowledgment number and bits containing error information, the decoder 7 generates control signals of the switch 2: send new information or repeat the transmission of information stored in block 5. At the same time, control signals are recorded in additional block 8 and are used to control switch 2 when transmitting the next block, if the next Yatom block decoder 11 detects an error.

If the decoder 11 detects an error in the received code block, then the block 12 marks in the drive 14 a place, the number of which is indicated by the counter 16, for its subsequent filling in the retransmission. Block 13 blocks the overwriting of service information from the input drive 10 to block 19 and the decoder 7.

A signal about the detection or non-detection of errors in the received code. the block produced by the decoder 11 also enters the drive 17, where it is stored for a time equal to the transmission time of one block. From the drive 17 to the former 18 is transmitted information about the presence of errors in the last received block, as well as in the block that preceded it. According to this information and by the number of the last received block coming from the counter 16, the driver 18 creates a receipt, which, using the adder b, is inserted into the transmitted signal.

The proposed device allows to increase the bandwidth of the channel without compromising the reliability of the transmission of information by reducing the amount of service information transmitted with each block.

Claims (1)

1. USSR author's certificate in application 2453544 / 18-09, cl. H 04 L 1/00, 1977 (prototype).