Pedyash V. Increase of spectral efficiency of systems with multiband transmission of symbols

Object of research is process of transfer of the discrete information by the multichannel modem. The purpose of research is the decision of a task of increase in spectral efficiency of systems of transfer of the discrete information at work on existing cables of multichannel systems with frequency division of channels. Research methods are mathematical analysis, mathematical and imitating modelling on the computer. Research results are the expressions for calculation of through-put of circuits with the peak-frequency characteristic depending on frequency, and speed of transfer of modems with one-strip modulation; ways of reduction of an intersymbolical and interchannel interference to the multichannel modem with one-strip modulation. Novelty consists in the following: modems which use for transfer of the digital information some frequency bands are known for a long time, however use of a plenty of strips leads to increase PAR a signal and significant delays by transfer of a signal. Results of researchare introduced in educational process in the Odessa National Academy of Telecommunication by name A.S.Popov and for the science work "Research of efficiency of digit-analog systems of transfer".