To the matter of improving the efficiency of communication channels with moving objects using APSK-n-signals

The features of the functioning of a non-parametric, frequency-selective communication channel with intersymbol interference are analyzed, in which APSK- N -signal for data transmission is used. The stability of data transfer rate increasing in such channel using proposed approach based on the «transparency windows» utilizing is studied. In this study the equally probable law of symbol values in modulating sequence was used. The stability «transparency windows» in the presence of a destabilizing factor as a frequency detuning is estimated. In addition, the influence on the stability of the «transparency window” of measurement errors of the envelope and phase produced by the receiver has been evaluated. Based on the study, recommendations were made to improve the speed in such communication channels.