Estimation of Probability of Error on Degree Telegraph Distortion

Abstract

Discrete messages transmitted over the radio channels are distorted under the influence of various kinds of additive and multiplicative interferences, this being the reason for errors on the receiver-side of the radio line. Error probability in the received message characterizes the communication channel quality at a definite period of time required for the radio line adaptation to the communication conditions. An immediate estimation of the error probability requires a lot of time, which in many cases exceeds the communication channel stationary interval and makes it impossible to provide operational adaptation of the radio line to the continuously changing communication conditions. The error probability and the value of telegraph (end) distortions in the received discrete message are known to be determined by the ratio of the received signal power and noise, which cannot be estimated directly, since both of these components are found in the communication channel simultaneously. Estimation of the degree of telegraph distortions takes less time compared to the time of error probability estimation. Therefore it is practical to assess error probability in the communication channel indirectly, estimating the degree of telegraph distortions at a limited interval of time in the sliding window, which is less than the interval of stationary state of the communication channel. The paper describes a specific version of the technical (software) implementation of the device for measuring the degree of telegraph distortions. The findings of the study can be used in the design of devices for radio line adaptation to communication conditions.