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T-Comm_Article 8_2_2022

INCREASING NOISE IMMUNITY OF THE RECEIVING DEVICE
AT RECEPTION OF DIGITAL SIGNAL DUE TO USE OF ADDITIONAL CHANNEL WITH PHASE CONVERTER

Khafaga Ali S. Mahdi,  Kazan National Research Technical University A.N. Tupolev-KAI (KNITU-KAI), Kazan, Russia, alisalahelect1985@gmail.com

Abstract
The rapid development of digital information transmission systems using radio signals has led to the need to improve receiving systems. This article considers the possibility of using an improved theory of narrow-band noise to increase the sensitivity of the receiving device when receiving digital signals. It is generally admitted that the task of detection is to make a decision about the presence or absence of a useful signal against the background of interference and noise, which is fundamentally impossible to get rid of. The narrow-band random process structurally is close to the amplitude-modulated oscillation with suppressed carrier and represents a beating signal of two sidebands. It follows from the theory of vibration beats that the phase of the high-frequency component changes by p when the signal envelope passes through 0. Consequently, phase jumps are explained by the fact that narrow-band noises are beating signals of two sidebands. It has been shown that by using the structural differences in the mixture of useful signal and noise and simply narrow-band noise, it is possible to significantly increase the reliability of receiving a digital signal in the field of small signal-to-noise ratios. The article describes in details the mathematical models of the receiving device with an additional receiving channel that uses the phase features of the useful signal and noise mixture and simply narrow-band noise for signal detection. A diagram of a receiving device with an additional channel for the implementation of the receiver on laboratory equipment is given in order to obtain real experimental data. In addition, comparative detection characteristics are presented for a classic single-channel receiver and a receiver with an additional receive channel.

Keywords: phase detector, noise immunity, radio impulse, narrow-band noise, wide-band white noise, two-channel receiver.

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Information about author:

Khafaga Ali S. Mahdi, postgraduate student, “Electronic and quantum systems of information transmission”, “Kazan National Research Technical University A.N. Tupolev-KAI” (KNITU-KAI), Kazan, Russia