The Study of Probabilistic Characteristics of Cyclo-Stationary APSK-N-Signals Caused by Communication Channel with Memory

New properties of communication channel with intersymbol interference utilizing by APSK-N-signals are investigated. Based on estimates of the symbol error rate caused by intersymbol interference, the possibility of increasing the data transmission rate in the channel due to "transparency windows" is estimated. New properties have been identified that allow a significant increase in the efficiency of such communication channels.