Bektursunov D. The effectiveness of systems with decision feedback on the basis of timing signals.

Subject matter of study - the process of coding and decoding during data transfer in adaptive systems. Scope of study - signal structures with basic information element less than the Nyquist one. Research methods- positional coding theory methods comparing to timer signals, control theory in the process of repeating the mistaken code word; theories of probabilities in calculating the capacity of signal structures ensembles were used to solve the assigned tasks. Theoretical and practical results: for the first time the signal duration between modulation points was offered to use as information parameter in the process of digital data transfer; for the first time the possibility of channel traffic improvement without changes in its alphabet by means of modulation at intervals that are aliquant parts of Nyquist element was proved; for the first time analytical expressions for dependence of data transfer systems parameters on the basis of TSS (timer signal structures) on noise parameters in the channel and necessary quality of transfer are received; for the first time analytical expressions for improvement of signal dispersion duration and receivers transfer function, which provide minimization of intersymbol noise when using TSS, are received; the received statistic parameters of errors and distortions in real channels allow to build error flow models; the synthesized algorithm of TSS forming with syndrome offset correction of significant renewal instants allow to increase the capacity of TSS ensemble at a given span of time; the suggested principle of TSS forming with periodic elements repeating of the channel alphabet provides signal frequency compression; the synthesized algorithm of simultaneous use of TSS and positional codes allow to increase speed transfer and data transfer systems stability.