Efficiency two-character ensembles of letters using in systems decision feedback

Abstract

The estimation of the efficiency of the transmission of discrete information in systems with solving feedback link is carried out in the work. It allows in each signal structure synthesized on the timed signals base of to transmit information about two next symbols of the Russian language or two bytes.In paragraph 1 “Efficiency of simplex discrete systems with position codingˮ, definition of simplex transmission systems is given according to [1], in which the quality of the received codeword and its correction are made on the receiving side. For which positional redundancy codes are used, an analysis of their main characteristics is carried out and it is proved that redundancy in position coding in channels of the Hilbert model over a longer transmission time interval is not used effectively.In paragraph 2 “Systems with ROS on the position codes baseˮ to increase the one element information capacity of the code structure, it was suggested to make the transition to the system with ROS, analysis of the losses for the repetition of detected errors in the code words of systems with ROS, in the radio relay telephone channel (Table 2). Taking into account that the entropy (the amount of information in the code word), according to [3], is determined by the expression (6), for increasing of it, it is necessary to increase the number of realizations on the code word interval.In paragraph 3 “Timed signals as a code multiplexing toolˮ, it is determined that, unlike positional coding, the distance between the modulation instants is not a multiple of the Nyquist element, but it is not less than it. Such formation of signal structures provides a greater number of them at a given interval, but with a minimum energy distance.In paragraph 4. “Conclusionˮ the main properties of the timer signals are defined, namely:1) the number of realizations of time signals Npm for m> 4, s> 3 is much larger than the number of realizations of the position codes NPK (Nt >> NPK );2) in Table. 3.4 [3] the values of Nрт are given for m Î 4¸10; s Î 1¸12; i Î 1¸6;3) correcting and simple TSK are realized on the same time interval Tsk = mt0;4) to increase the information capacity of the nayquist element, it is necessary to create ensembles from the sets of signal structures for a different number of segments i in the code word.