Astrakhantsev A. Boosting of efficiency of a means of an information communication on band-limited channels

The object of probings is the process of shaping and signal processing in band-limited channels. The purpose is boosting of efficiency of a digital means of an information communication on band-limited channels. Methods is synthesis and application of signals with a compact spectrum fitting to criterion Nyquist, refinement of algorithms of modulation. In operation transcendental functions for approximating signals with a compact spectrum for the first time are used. The variant of algorithm of modulation and demodulation is developed which will use the synthesized signals and provides more narrow bandwidth of frequencies, than traditionally used algorithms 2B1Q and QAM. The analytical expression for a low bound of probability of erratic reception of multilevel signals for preset signal to noise ratios and dispersion jitter is obtained. The work is inserted in the educational process of faculty "of "Transmission network", in scientific activity KNURE and industrial activity in "Ukrtelekom". Application- network of subscriber access.