Duration of nonorthogonal multifrequency signals in the presence of controlled intersymbol interference

We propose a subcarriers frequency layout, which minimizes the interference of adjacent subcarriers. An optimization problem of the envelope forms synthesis for the duration of the increased signals, in the presence of restrictions on the out-of-band emissions and cross-correlation coefficient, is produced and solved. Waveforms, corresponding spectral characteristic, values used frequency spacing between subcarriers for the signals of increased duration are presented.