Kolchenko V. Increase of efficiency of functioning of mobile communication network on the base of demodulators of OFDM

Research object are the base of demodulators of OFDM for the reception and information transfer by communication channels. Purpose and task of research. The decision of complex of the scientific and technical questions, related to planning of the base of demodulators on speed transmission and antijammingness of demodulators of OFDM and with amplitude-phase modulation, which are intended for the reception and information transfer in wireless networks, is the purpose of dissertation work. Methods of researches. For achievement of the problems set in dissertation work a theory is used discrete messages passing, theory of spectral analysis, statistical communication theory. The scientific novelty of the got job performances consists in the following: on the basis of theory of filtration of Calman - Бьюси the receiver of multichannel discrete signals optimum after the criterion of minimum is synthesized for communication channels with permanent parameters, fluctuation hindrance interchannels and intercharacters hindrances; it is shown that efficiency of the systems of discrete information transfer can be to a great extent multiplied due to transition from one-channel to the multichannel systems; the methods of calculation of dependence of amount of channels of OFDM are developed from the logarithmic measure of efficiency for the different values of coefficient of smoothing out of spectrum of individual channels; it is first shown that for high-efficiency demodulators of OFDM without an optimum appraiser the characteristic barrier of antijammingness, caused by the action of interchannels hindrances, it is possible to reduce due to worsening of efficiency of the system, or on speeds near to the carrying capacity of channel, by introduction to the structure of demodulators of optimum estimating filter. Theoretical and practical positions of dissertation work found realization in researches works which were executed in the State enterprise of "UNDIZ" and State university of informatively-communications technologies, and is used in an educational process.