PHYSICAL INVESTIGATION OF NOISE IMMUNITY OF PHASE-KEYED SIGNALS IN DIGITAL MICROWAVE COMMUNICATION CHANNELS

Abstract

The paper presents a study of signals with binary phase modulation (BPSK). As a physical model, a block diagram of a digital communication system with a phase-shift keyed signal is proposed, which consists of a transmitting part, a communication channel and a receiving part. The information source of the proposed circuit can be both an analog and a digital signal. The developed programs in the Matlab environment visually represent the graphs of the information signal and the modulated microwave signal with binary phase shift keying without interference, and under the influence of noise interference. The proposed communication system is evaluated by spectral efficiency. The spectral characteristics of the BPSK signals were obtained using the fast Fourier transform. The noise immunity of receiving microwave radio signals with BPSK was considered as the probability of a symbol error depending on the signal-to-noise ratio. A comparative analysis of noise immunity for signals with phase modulation with respect to signals with amplitude modulation has been carried out.