SU482021A1 - Method of transmitting decision feedback signals in duplex data transmission systems with accumulation - Google Patents

Description

| Nalu total group is made as follows. For each sequence of symbols equal to the length of the code combination of the block linear code that form a group, a syndrome is calculated. In the case of the absence of errors in them, the resulting syndromes. form a combination of a linear block code used to encode the POC signals. If some of the indicated sequences contain errors, then the syndromes calculated for them may not coincide with the corresponding symbols of the code combination of the DFB signals transmitted in the group, I However, they will be corrected provided that the number of distorted symbols does not exceed the number of errors corrected block linear code used to encode POC signals. The proposed method (the method ensures the transmission of information in the reverse channel with little or no reliability if the minimum code distance of the code used to encode the POC signals is greater than or equal to the minimum code distance of the code used to encode the transmitted information. The invention is clarified Fig. 1 shows in Fig. 1 a structural electrical diagram of a variant of a device intended for the summary group; Fig. 2 is a variant of a device for selecting a signal in POC; in Fig. 3, the diagram of the construction of the total group, in front of the channel, to the channel The device for forming the total group contains pin 1 to which the source of information symbols is connected. Information symbols are fed to encoder 2. The source of POC signals is connected to pin 3, from where signals come to encoder 4. The outputs of encoders 2 and 4 are connected modully to 1 of adder 5. A device for extracting POC signals contains pin 6, (see. 2) to which the total group from the output of the discrete channel goes to the control device 7. From exit Of the polar device 7, each of the syndromes comes in the decoder. From the decoder 8, a sequence of Kr symbols, corresponding to: l the signal KG POC, goes to the output pin 9; The proposed method can be implemented as follows. The ftt length group consists of binary linear ftp code combinations (H, the code that is used to encode the transmitted information. To encode the POC signal is used (about 2 code with base 2. Each character (h, Cr). Code presented in the sequence of -, i binary symbols, is summed with the check characters of the corresponding code word (I, F) - the code included in the group (see Fig. 3). Information symbols from the source connected to pin 1 () ° step W / P blocks of jfj symbols in each (with, intervals equal to the arrival time of 1 characters to encoder 2 (71) code. It forms test symbols for each block of k characters. The sequence of 2 characters corresponding to the POC signals from the source connected to pin 3 goes to encoder 4 (L, jc) code, where check symbols are formed, summation is performed only at the moments Jf of check symbols each of the fl code combinations (tl,) —the code from the output of the encoder 2 to the input of the input code 5, the corresponding symbol arrives at its second input ( as a sequence of, -, i dv ary symbols) output from the encoder 4. The total group with discrete channel output passes through the clamp 6 (see. FIG. 2) to the control device 7 (fl - code. In the control device 7 for each L -th sequence (I 1,2, ..., I / t, ..) of / t .. characters taken by the total group, written syndrome, which, in the absence of channel errors, corresponds to the i -th symbol of the codecode combination (, k) -code. Otherwise, the calculated syndrome may not correspond to the I, -th symbol of the code combination (ft2 -code. C the output of the control device 7, each syndrome enters the decoder 8 (H,) code. After the P syndromes enter the decoder 8, a decoder is produced code sequence (fl y (Cp) error-correcting code. From decoder 8, a sequence of k symbols corresponding to the POC signals, goes to output terminal 9 .. Selection of information from a received channel of a sequence of symbols is carried out after decoding, the POC signal is processed as follows: At the beginning of a received channel, the sequence of characters is divided into blocks of length T1 and for each block of length Ti according to the 1 construction rules (tlv. k code computes the syndrome. Then the syndrome is added by modifying the base of the correction code of the POC signal: the POC with the corresponding symbol I (a sequence of tl-k binary symbols) of the POC signal combination resulting from decoding the POC signals. According to the value thus refined, the syndrome, in accordance with the rules for building the (ft-, 1k) code, decides on the reliability of the next block of information. . The subject of the invention is a method for transmitting decisive I feedback signals in a duplex data transmission system, which, in order to increase the data transmission rate on a transmission, modulo the two binary symbols of a decisive feedback signal combination with check binary characters of the sequence of code combinations of the block error-resistant data code, and at the reception decode the received sequence of characters with error correction in accordance with the rule of anti-interference code. from the decisive feedback of a sequence of syndromes mated in accordance with the rule for the construction of the error-correcting data code; using the values of symbols received from the channel, the data is extracted from the received sequence of symbols by decoding according to the rules of the error-correcting code data of the sequence of symbols, which is formed by modulo-adding two binary symbols of the code combination of the decision feedback signal corrected as a result of the correction decoding errors of the sequence of syndromes, with the corresponding symbols of the received sequence of symbols

J o

ABOUT

t

(rig 7

-H

five

fPue.2