EVALUATION OF NOISE IMMUNITY OF COHERENT RECEPTION OF SIGNALS WITH MULTI-POSITION PHASE SHIFT KEYING IN THE PRESENCE OF NON-FLUCTUATION INTERFERENCE

Abstract

In the article, a new and relevant scientific task is solved regarding the evaluation of immunity to interference of coherent reception of signals with multi-position phase modulation in the presence of non-fluctuating interference. Improving the efficiency of the use of telecommunication networks based on signal transmission technology with multi-position phase shift keying is directly related to limitations and harmful processes that have a negative impact on the speed of digital data transmission, their volume and on the reliability of the received signals associated with noise immunity.

The criterion for evaluating the immunity to interference of coherent reception of signals with multi-position phase modulation in the presence of non-fluctuating interference is defined and substantiated, as the probability of the appearance of a bit error is proposed. A model for evaluating the interference immunity of coherent reception of signals with multi-position phase manipulation in the presence of non-fluctuating interference has been developed and presented. The presented model is based on the probabilistic characteristics of the occurrence of symbol and bit error of a signal with multi-position phase modulation relative to the accepted level of harmonic non-fluctuating interference for different values of the signal-to-noise ratio at the input of a coherent receiver. The results of the evaluation of the immunity to coherent reception of signals with multi-positional phase manipulation in the presence of harmonic non-fluctuating interference showed that with increasing signal positionality, the influence of harmonic interference for M=2 or M=4 practically does not increase the amount of bit error. When the positionality increases to M=16 or M=32, the probability of a bit error and, accordingly, a decrease in the immunity of the signal with multi-positional phase manipulation, becomes noticeable. It is shown that, at high intensity, targeted harmonic non-fluctuating interference practically destroys the reception of all types of signals with multi-position phase manipulation. The presented results can be applied in the development of new and improved existing telecommunication systems based on signal transmission technology with multi-position phase manipulation.