In the article, it is described the principles of implementing the method based on quasiorthogonal frequency access on subcarrier frequencies. The key element of quasiorthogonal frequency access on subcarrier frequencies is the using of the individual distribution of frequency subcarriers in different frequency plans of the ensemble in the general frequency band, which allows increasing the subscriber capacity of the radio system significantly. It was developed an algorithm for the formation of the ensemble, taking into account the different values of the width of the subchannels in the corresponding frequency plans. It was graphically represented the form of frequency plans with different bandwidths and the dependence of the maximum emissions of the mutual correlation function of frequency plans, taking into account the number of subcarriers and the width of subchannels. For realization the statistical analysis, it was constructe an imitation model of the radio channel, it were graphically represented the results of statistical analysis of the interrelationship properties of frequency plans, and investigated the correlation properties of complex signals based on QOFDM. Using the quasiorthogonal access on subcarrier frequencies allows increasing the subscriber capacity of the communication system and the rate of information transmission due to the nonlinear distribution of the subcarrier frequencies. K e ywor d s : quasi-orthogonal frequency access on subcarrier frequencie; spectral hole; frequency collisions; bandwidth; frequency plan; an ensemble; the subscriber capacity.
Statement problemThe Method of quasiorthogonal access on subcarrier frequencies developed and base on principle null orthogonal property between subcarrier frequencies [1].One of the problems to by forming signal of method quasiorthogonal access on subcarrier frequencies (QOFDM) it is problem of determining subcarrier frequencies what coincided by pairwise comparison frequency plans. The result of unequal variants distribution subcarrier frequencies appeared is problem of determining combination subcarriers in different of frequency ensemble's plans. Problem was solution by propose apply method what described below. Analysis literatureThe dynamic changing demand in cognitive wirelesses probably effect frequency collisions i.e. simultaneous occupancy by different subscribers one and that same band what dues augmentation level intrasystem noise [1, 4, 7]. Therefore the method QOFDM have been proposed what allows to solve problem of augmentation capability of system and contraction of level of intrasystem noise. At the same time appeared problem of determining combination by pairwise comparison different frequency plans. But not obtain famous origins wherein described method of determining coincidence positions subcarrier frequencies for quasiorthogonal frequency-division multiplexing. Aim of articleThe aim of article is developing of method of determining coincidence positions subcarrier frequencies by QOFDM what enables to simplify process synthesis and permits to reduce level intrasystem noise on phase forming of frequency plans.
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