CAPACITY ESTIMATION METHOD WITH LINEAR COMPUTATIONAL COMPLEXITY OF NARROW-BAND IONOSPHERIC DECAMETER CHANNELS WITH PSK-N-SIGNALS

Abstract

The paper presents a new algorithm with linear time complexity, depending on the effective channel memory, for estimating the resolution time and capacity of a frequency-selective communication channel using a linear receiver and a multi-position phase-shift keying signal. The main limitation of the method is the possibility of its application for frequency-selective communication channel with symmetrical amplitude-frequency response relative to the central frequency of the channel, which is equal to the frequency of the received signal. From a practical point of view, this method can be used in the construction of radio engineering systems with serial data transmission in narrow-band ionospheric decameter communication channels (3-12 kHz). The key features of this method are: 1) constant number of equations equal to 1; 2) linear dependence of the number of terms in the equation on effective memory; 3) a new, more accurate procedure for estimating the effective memory of the channel, which allows you to simultaneously determine the resolution time and capacity. These features provide an increase in frequency efficiency by reducing overhead costs for setting the parameters of a serial phase radio engineering data transmission system for HF communication channels with a bandwidth of 3-12 kHz.